CN110460018A - A kind of electric machine controller and its alternate protection circuit - Google Patents
A kind of electric machine controller and its alternate protection circuit Download PDFInfo
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- CN110460018A CN110460018A CN201910807402.5A CN201910807402A CN110460018A CN 110460018 A CN110460018 A CN 110460018A CN 201910807402 A CN201910807402 A CN 201910807402A CN 110460018 A CN110460018 A CN 110460018A
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- 238000005070 sampling Methods 0.000 claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims description 122
- 230000005611 electricity Effects 0.000 claims description 16
- 239000004065 semiconductor Substances 0.000 claims description 7
- 230000003044 adaptive effect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000009466 transformation Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/083—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for three-phase systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
- H02H7/205—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment for controlled semi-conductors which are not included in a specific circuit arrangement
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The application provides a kind of electric machine controller and its alternate protection circuit.Wherein, in the alternate protection circuit of electric machine controller; overcurrent protection value in hardware current foldback circuit for being compared with the sampled value of inverter circuit exchange side phase current; it is a variable value, there are the mistake flow point signal of corresponding relationship is that flow relation is crossed according to preset temperature by control unit and is determined, signal corresponding with the inverter circuit temperature that temperature sampling circuit samples with it；Namely; the judgment basis that hardware current foldback circuit control driving circuit stops working; it is to be provided by control unit according to the temperature of inverter circuit; the judgment basis that temperature does not make driving circuit stop working simultaneously also can adaptive change; compared with prior art; electric machine controller main power device, such as MOSFET or IGBT are reduced, the risk of electric power accident occurs in low temperature.
Description
Technical field
The present invention relates to power electronics fields, more particularly to a kind of electric machine controller and its alternate protection circuit.
Background technique
In general, electric machine controller is set between alternating current generator and power supply, the direct current of power supply can be not only converted to
Alternating current powers for alternating current generator, can also control the operating status of alternating current generator, can be applied to alternating current generator different
Operative scenario.
In addition, the absolute value when the current value between alternating current generator any two input terminal is greater than preset overcurrent protection value
Absolute value, i.e., alternating current generator occur phase fault when, electric machine controller will do it Feng Boguan pipe operation, make itself stop work
Make, to avoid itself being damaged.
But when phase fault occurs for alternating current generator, if the power semiconductor in electric machine controller is in low temperature
Environment, then the voltage stress excess that power semiconductor can be made to bear, or even power semiconductor is made to enter avalanche condition,
And then electric machine controller damage risk is greatly increased, therefore, electricity occurs in cryogenic applications for electric machine controller in the prior art
The risk of power accident is larger.
Summary of the invention
The embodiment of the present application provides a kind of electric machine controller and its alternate protection circuit, to solve motor in the prior art
The larger problem of risk of electric power accident occurs in cryogenic applications for controller.
To achieve the above object, the embodiment of the present invention provides the following technical solutions:
On the one hand the application provides a kind of alternate protection circuit of electric machine controller, comprising: temperature sampling circuit, control are single
Member and hardware current foldback circuit；Wherein:
The temperature sampling circuit is for sampling the temperature of inverter circuit and output in the electric machine controller；
Described control unit is used to cross the temperature of flow relation and the inverter circuit according to preset temperature, it is determining with it is described inverse
The temperature on power transformation road is corresponding to be crossed flow point signal and exports；
The hardware current foldback circuit is for receiving current sample in the flow point signal excessively and the electric machine controller
The sampled value of the inverter circuit exchange side phase current of circuit output；When the sampled value of inverter circuit exchange side phase current
Absolute value when being greater than the absolute value for crossing the corresponding overcurrent protection value of flow point signal, control the drive in the electric machine controller
Dynamic circuit stops working.
Optionally, the preset temperature crosses flow relation are as follows: described control unit is according to the power in the inverter circuit half
The voltage endurance curve that conductor device varies with temperature, between the temperature of the inverter circuit measured and excessively flow point signal
Corresponding relationship.
Optionally, the flow point signal excessively includes low flow point signal excessively and exceeds flow point signal；
Described control unit is exported the flow point signal that exceeds to the hardware overcurrent protection by high overcurrent output end
The high overcurrent input terminal of circuit；
Described control unit is exported the low flow point signal of crossing to the hardware overcurrent protection by low overcurrent output end
The low overcurrent input terminal of circuit.
Optionally, the hardware current foldback circuit, comprising: exceed flow point protection circuit, low overcurrent point protection circuit with
And auxiliary circuit；Wherein:
High overcurrent input terminal of the positive input terminal for exceeding flow point protection circuit as the hardware current foldback circuit；
Low overcurrent input terminal of the negative input end of the low overcurrent point protection circuit as the hardware current foldback circuit；
The negative input end for exceeding flow point protection circuit is connected with the positive input terminal of the low overcurrent point protection circuit, even
Contact receives the sampled value of the inverter circuit exchange side phase current of the current sampling circuit output；
The output end for exceeding flow point protection circuit, the output end of the low overcurrent point protection circuit and the auxiliary
The third end of circuit is connected, and tie point is connected with the logic control end of the driving circuit；
The first end of the auxiliary circuit is grounded, and the second end of the auxiliary circuit accesses predeterminated voltage.
Optionally, the flow point protection circuit that exceeds includes: to exceed flow point configuration circuit and exceed flow point comparison circuit；Institute
Stating low overcurrent point protection circuit includes: low flow point configuration circuit excessively and low flow point comparison circuit excessively；Wherein:
The input terminal for exceeding flow point configuration circuit exceeds the positive input terminal of flow point protection circuit as described in；
The output end for exceeding flow point configuration circuit is connected with the positive input terminal for exceeding flow point comparison circuit；
The negative input end for exceeding flow point comparison circuit exceeds the negative input end of flow point protection circuit as described in；
The output end for exceeding flow point comparison circuit exceeds the output end of flow point protection circuit as described in；
Negative input end of the low input terminal for crossing flow point configuration circuit as the low overcurrent point protection circuit；
The low output end for crossing flow point configuration circuit is connected with the low negative input end for crossing flow point comparison circuit；
Positive input terminal of the low positive input terminal for crossing flow point comparison circuit as the low overcurrent point protection circuit；
Output end of the low output end for crossing flow point comparison circuit as the low overcurrent point protection circuit.
Optionally, described to exceed flow point configuration circuit, comprising: first resistor, second resistance, 3rd resistor, the 4th resistance,
5th resistance, the 6th resistance, the 7th resistance, first capacitor, the second capacitor, third capacitor and the 4th capacitor；Wherein:
The 3rd resistor, the 5th resistance and the 7th resistance are sequentially connected in series, concatenated one end, described second
One end of resistance and one end of the first capacitor are connected；The concatenated other end is connected with one end of the 4th capacitor,
Tie point exceeds the output end of flow point configuration circuit as described in；
The other end of the second resistance is connected with one end of the first resistor, exceeds flow point described in tie point conduct and matches
The input terminal of circuits；The other end of the first resistor accesses the predeterminated voltage；
One end of 4th resistance is connected with the tie point of the 3rd resistor and the 5th resistance, the 4th electricity
The other end of resistance is connected with one end of second capacitor；
One end of the 6th electricity group is connected with the tie point of the 5th resistance and the 7th resistance, the 6th electricity
The other end of resistance is connected with one end of the third capacitor；
The other end of the first capacitor, the other end of second capacitor, the other end of the third capacitor and institute
The other end for stating the 4th capacitor is grounded.
Optionally, described to exceed flow point comparison circuit, comprising: the 8th resistance, the 9th resistance, the 5th capacitor, the 6th capacitor
And first operational amplifier；Wherein:
One end of 8th resistance is connected with one end of the 5th capacitor, exceeds flow point described in tie point conduct and compares
The positive input terminal of circuit；
The other end of 8th resistance is connected with the first operational amplifier non-inverting input terminal；
One end of 9th resistance exceeds the negative input end of flow point comparison circuit as described in；
The other end of 9th resistance is connected with one end of the 6th capacitor, tie point and first operation amplifier
The inverting input terminal of device is connected；
The other end of 5th capacitor and the other end of the 6th capacitor are grounded；
The output end of first operational amplifier exceeds the output end of flow point comparison circuit as described in.
Optionally, the low flow point configuration circuit excessively, comprising: the tenth resistance, eleventh resistor, twelfth resistor, the tenth
Three resistance, the 14th resistance, the 15th resistance, the 16th resistance, the 7th capacitor, the 8th capacitor, the 9th capacitor and the tenth electricity
Hold；Wherein:
The twelfth resistor, the thirteenth resistor and the 14th resistance are sequentially connected in series, concatenated one end, institute
The one end and described 7th capacitor one end for stating eleventh resistor are connected；One end of the concatenated other end and the tenth capacitor
It is connected, tie point is as the low output end for crossing flow point configuration circuit；
The other end of the eleventh resistor is connected with one end of the tenth resistance, and tie point is as the low flow point excessively
The input terminal of configuration circuit；
One end of 15th resistance is connected with the tie point of the twelfth resistor and the thirteenth resistor, described
The other end of 15th resistance is connected with one end of the 8th capacitor；
One end of 16th resistance is connected with the tie point of the thirteenth resistor and the 14th resistance, described
The other end of 16th resistance is connected with one end of the 9th capacitor；
The other end of tenth resistance, the other end of the 7th capacitor, the other end of the 8th capacitor, described
The other end of the other end of nine capacitors and the tenth capacitor is grounded.
Optionally, described low to cross flow point comparison circuit, comprising: the 17th resistance, the 18th resistance, the 11st capacitor, the
12 capacitors and second operational amplifier；Wherein:
One end of 17th resistance is as the low positive input terminal for crossing flow point comparison circuit；
The other end of 17th resistance is connected with one end of the 11st capacitor, tie point and second operation
The non-inverting input terminal of amplifier is connected；
One end of 18th resistance is connected with one end of the 12nd capacitor, and tie point is as the low flow point excessively
The negative input end of comparison circuit；
The other end of 18th resistance is connected with the inverting input terminal of the second operational amplifier；
The other end of 11st capacitor and the other end of the 12nd capacitor are grounded；
The output end of the second operational amplifier is as the low output end for crossing flow point comparison circuit.
Optionally, the auxiliary circuit, comprising: the 19th resistance and the 13rd capacitor；Wherein:
First end of the one end of 13rd capacitor as the auxiliary circuit, the other end of the 13rd capacitor with
One end of 19th resistance is connected, third end of the tie point as the auxiliary circuit；19th resistance it is another
Hold the second end as the auxiliary circuit.
Optionally, described control unit is independently of the control circuit in the electric machine controller, alternatively, being integrated in the control
Circuit processed.
On the other hand the application provides a kind of electric machine controller, comprising: control circuit, driving circuit, inverter circuit, electric current
Sample circuit and alternate protection circuit as described in any one of the above embodiments；Wherein:
The output end of the current sampling circuit is connected with the current sample input terminal of the control circuit；
Each output end of control circuit input terminal corresponding with the driving circuit is connected；
Each output end of driving circuit control terminal corresponding with the inverter circuit is connected.
Optionally, the inverter circuit is three-phase inverting circuit or single-phase inversion circuit.
Optionally, the control circuit is Digital Signal Processing control circuit DSP control circuit or micro-control unit MCU.
In this application, it is carried out in hardware current foldback circuit for exchanging the sampled value of side phase current with inverter circuit
The overcurrent protection value compared is a variable value, with its there are the mistake flow point signal of corresponding relationship be by control unit according to
Preset temperature crosses flow relation and determines, signal corresponding with the inverter circuit temperature that temperature sampling circuit samples；
That is, the judgment basis that hardware current foldback circuit control driving circuit stops working, is by control unit according to inverter circuit
Temperature and provide, the judgment basis that temperature does not make driving circuit stop working simultaneously also can adaptive change, with existing skill
Art is compared, and electric machine controller main power device, such as MOSFET (Metal-Oxide-Semiconductor Field- are reduced
Effect Transistor, metal-oxide semiconductor fieldeffect transistor) or IGBT (Insulated Gate
Bipolar Transistor, insulated gate bipolar transistor), the risk of electric power accident occurs in low temperature.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 a is a kind of schematic diagram of the alternate protection circuit of electric machine controller provided by the embodiments of the present application；
Fig. 1 b is the schematic diagram of the alternate protection circuit of another electric machine controller provided by the embodiments of the present application；
Fig. 2 is the schematic diagram for the hardware current foldback circuit 300 that another embodiment of the application provides；
Fig. 3 is the schematic diagram for the hardware current foldback circuit 300 that another embodiment of the application provides；
Fig. 4 is the particular circuit configurations schematic diagram of hardware current foldback circuit 300 in practical application；
Fig. 5 is the particular circuit configurations schematic diagram of inverter circuit 600 in practical application.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In this application, the terms "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion,
So that the process, method, article or equipment for including a series of elements not only includes those elements, but also including not having
The other element being expressly recited, or further include for elements inherent to such a process, method, article, or device.Do not having
There is the element limited in the case where more limiting by sentence "including a ...", it is not excluded that in the mistake including the element
There is also other identical elements in journey, method, article or equipment.
Electric machine controller in the prior art is as shown in Figure 1a, comprising: current sampling circuit 700, driving circuit 500, control
Circuit 400 and inverter circuit 600 processed.The risk of electric power accident larger problem occurs when due to its cryogenic applications, this
The alternate protection circuit that application provides a kind of electric machine controller is specifically included as shown in dotted line frame in Fig. 1 a: temperature sampling electricity
Road 100, control unit 200 and hardware current foldback circuit 300.Wherein:
Temperature sampling circuit 100 samples the temperature of inverter circuit 600, and sampled result is exported by output end to control
The temperature sampling input terminal of unit 200.
Control unit 200 crosses the temperature of flow relation with the inverter circuit 600 received, determining and inversion according to preset temperature
The temperature of circuit 600 is corresponding to cross flow point signal, and exports to hardware current foldback circuit 300.
Refer to it should be noted that the preset temperature crosses flow relation: control unit 200 is according to the function in inverter circuit 600
The voltage endurance curve that rate semiconductor devices varies with temperature, the temperature of the inverter circuit 600 measured and excessively flow point signal
Between corresponding relationship.
Optionally, control unit 200 can also can integrate independently of control circuit 400 (as shown in Figure 1a) in control
Circuit 400 (as shown in Figure 1 b), is not specifically limited herein, can be depending on the circumstances, but in the protection scope of the application
It is interior.It should be noted that by control unit 200 independently of control circuit 400, when control unit 200 or control circuit 400 occur
When failure needs replacing, the two can be individually replaced；Control unit 200 is integrated in the form of software in control circuit 400,
The cost of the alternate protection circuit of electric machine controller provided by the present application can be reduced.
Hardware current foldback circuit 300 receives this and crosses the inverter circuit 600 that flow point signal and current sampling circuit 700 export
Exchange the sampled value of side phase current；Also, when the absolute value that inverter circuit 600 exchanges the sampled value of side phase current was greater than flow point
When the absolute value of the corresponding overcurrent protection value of signal, hardware current foldback circuit 300 controls driving circuit 500 and stops working, from
And inverter circuit 600 is made to stop working, so that entire electric machine controller stops working, electric machine controller is avoided to be damaged.
In this application, for exchanging the sampled value of side phase current with inverter circuit 600 in hardware current foldback circuit 300
The overcurrent protection value being compared is a variable value, there are the mistake flow point signal of corresponding relationship is by control unit with it
The temperature of 200 inverter circuits 600 that flow relation is crossed according to preset temperature and is determined, is obtained with the sampling of temperature sampling circuit 100
Spend corresponding signal；That is, hardware current foldback circuit 300 controls the judgment basis that stops working of driving circuit 500, be by
Control unit 200 is provided according to the temperature of inverter circuit 600, and temperature does not make what driving circuit 500 stopped working to sentence simultaneously
Disconnected foundation also can adaptive change reduce electric machine controller main power device compared with prior art, such as MOSFET or
The risk of electric power accident occurs in low temperature for IGBT.Also, the judgment basis that driving circuit 500 stops working varies with temperature
Adaptive change can occur, enhance the alternate protection circuit of electric machine controller provided by the present application to the adaptation of environment, it can be with
The environment big suitable for temperature span.
In practical application, this is crossed flow point signal and includes low flow point signal excessively and exceed flow point signal, at this point, control unit
200 are exported flow point signal is exceeded to the high overcurrent input terminal of hardware current foldback circuit 300 by high overcurrent output end, and are led to
Too low overcurrent output end exports low flow point signal of crossing to the low overcurrent input terminal of hardware current foldback circuit 300.
Specifically, another embodiment of the application provides a kind of specific structure of hardware current foldback circuit 300, such as Fig. 2 (figure
In be not drawn into the first end and second end of auxiliary circuit 330) shown in, which includes: to exceed flow point guarantor
Protection circuit 310, low overcurrent point protection circuit 320 and auxiliary circuit 330.
Exceed high overcurrent input terminal of the positive input terminal of flow point protection circuit 310 as hardware current foldback circuit 300；It is low
Low overcurrent input terminal of the negative input end of overcurrent point protection circuit 320 as hardware current foldback circuit 300.
The negative input end for exceeding flow point protection circuit 310 is connected with the positive input terminal of low overcurrent point protection circuit 320, connects
Point receives the sampled value that the inverter circuit 600 that current sampling circuit 700 exports exchanges side phase current.
Exceed the output end of flow point protection circuit 310, the output end and auxiliary circuit of low overcurrent point protection circuit 320
330 third end is connected, and tie point is connected with the logic control end of driving circuit 500；First termination of auxiliary circuit 330
The second end on ground, auxiliary circuit 330 accesses predeterminated voltage.
The overcurrent protection value it should be noted that overcurrent protection value corresponding with flow point signal is exceeded is positive crosses flow point with low
The corresponding overcurrent protection value of signal is negative overcurrent protection value；Preferably, the absolute value of positive overcurrent protection value and negative overcurrent protection value
It is equal.
In actual operation, the positive input terminal reception for exceeding flow point protection circuit 310 exceeds flow point signal, and by high overcurrent
The corresponding positive overcurrent protection value of point signal is compared with the sampled value that inverter circuit 600 exchanges side forward direction phase current, if inversion
The sampled value that circuit 600 exchanges side forward direction phase current is greater than positive overcurrent protection value, then exports closing control signal to driving circuit
500 logic control end, control driving circuit 500 stop to 600 output drive signal of inverter circuit, i.e., PWM control that treated
Signal processed makes inverter circuit 600 stop working, so that electric machine controller be made to stop working, electric machine controller is avoided to be damaged；If
The sampled value that inverter circuit 600 exchanges side forward direction phase current is less than or equal to the absolute value of the overcurrent protection value, then will not be to driving
Circuit 500 is controlled.
Low 320 negative input end of overcurrent point protection circuit receives low flow point signal excessively, and low flow point signal excessively is corresponding negative
Overcurrent protection value is compared with the sampled value that inverter circuit 600 exchanges side negative sense phase current, if inverter circuit 600 exchanges side and bears
It is greater than the absolute value of negative overcurrent protection value to the absolute value of the sampled value of phase current, then exports closing control signal to driving circuit
500 logic control end, control driving circuit 500 stop to 600 output drive signal of inverter circuit, i.e., PWM control that treated
Signal processed makes inverter circuit 600 stop working, so that electric machine controller be made to stop working, electric machine controller is avoided to be damaged；If
The absolute value that inverter circuit 600 exchanges the sampled value of side negative sense phase current is less than or equal to the absolute value of the overcurrent protection value, then not
Driving circuit 500 can be controlled.
Remaining structure and working principle are same as the previously described embodiments, no longer repeat one by one herein.
Another embodiment of the application on the basis of embodiment shown in Fig. 2, provides and exceeds the one of flow point protection circuit 310
Kind specific embodiment, such as Fig. 3 are specifically included: being exceeded flow point configuration circuit 311 and exceeded flow point comparison circuit 312.
Exceed the input terminal of flow point configuration circuit 311 as the positive input terminal for exceeding flow point protection circuit 310；Exceed flow point
The output end of configuration circuit 311 is connected with the positive input terminal for exceeding flow point comparison circuit 312.
Exceed the negative input end of flow point comparison circuit 312 as the negative input end for exceeding flow point protection circuit 310；High overcurrent
The output end of point comparison circuit 312 is as the output end for exceeding flow point protection circuit 310.
In actual operation, when the input terminal for exceeding flow point configuration circuit 311, which receives, exceeds flow point signal, according to height
Flow point signal is crossed, positive overcurrent protection value corresponding with flow point signal is exceeded is configured, and exports supreme flow point comparison circuit 312 excessively
Positive input terminal；The sampled value that inverter circuit 600 exchanges side phase current is received in the negative input end for exceeding flow point comparison circuit 312
Afterwards, the sampled value that inverter circuit 600 exchanges side forward direction phase current is compared with positive overcurrent protection value, if inverter circuit 600
The sampled value for exchanging side forward direction phase current is greater than positive overcurrent protection value, then exports closing control signal, and control driving circuit 500 stops
Only work；If the sampled value that inverter circuit 600 exchanges side forward direction phase current is less than or equal to positive overcurrent protection value, not to driving electricity
Road 500 is controlled.
In practical applications, exceed specific structure such as Fig. 4 of flow point configuration circuit 311, comprising: first resistor R1, second
Resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, first capacitor C1, second
Capacitor C2, third capacitor C3 and the 4th capacitor C4.
3rd resistor R3, the 5th resistance R5 and the 7th resistance R7 are sequentially connected in series, concatenated one end, second resistance R2 one
End and one end of first capacitor C1 are connected；The concatenated other end is connected with one end of the 4th capacitor C4, and tie point is as high
Cross the output end of flow point configuration circuit 311.
The other end of second resistance R2 is connected with one end of first resistor R1, and tie point, which is used as, exceeds flow point configuration circuit
311 input terminal；The other end of first resistor R1 accesses predeterminated voltage.
One end of 4th resistance R4 is connected with the tie point of 3rd resistor R3 and the 5th resistance R5, and the 4th resistance R4's is another
End is connected with one end of the second capacitor C2.
One end of 6th resistance R6 is connected with the tie point of the 5th resistance R5 and the 7th resistance R7, and the 6th resistance R6's is another
End is connected with one end of third capacitor C3.
The other end of first capacitor C1, the other end of the second capacitor C2, third capacitor C3 the other end and the 4th capacitor
The other end of C4 is grounded.
In practical applications, exceed specific structure such as Fig. 4 of flow point comparison circuit 312, comprising: the 8th resistance R8, the 9th
Resistance R9, the 5th capacitor C5, the 6th capacitor C6 and the first operational amplifier U1A.
One end of 8th resistance R8 is connected with one end of the 5th capacitor C5, and tie point, which is used as, exceeds flow point comparison circuit 312
Positive input terminal.
The other end of 8th resistance R8 and the first operational amplifier U1A non-inverting input terminal.
One end of 9th resistance R9 is as the negative input end for exceeding flow point comparison circuit 312.
The other end of 9th resistance R9 is connected with one end of the 6th capacitor C6, tie point and the first operational amplifier U1A's
Inverting input terminal is connected.
The other end of 5th capacitor C5 and the other end of the 6th capacitor C6 are grounded.
The output end of first operational amplifier U1A is as the output end for exceeding flow point comparison circuit 312.
Meanwhile the present embodiment additionally provides a kind of specific embodiment of low overcurrent point protection circuit 320, such as Fig. 3, specifically
It include: low flow point configuration circuit 321 excessively and low flow point comparison circuit 322 excessively.
Negative input end of the low input terminal for crossing flow point configuration circuit 321 as low overcurrent point protection circuit 320；It is low to cross flow point
The output end of configuration circuit 321 is connected with the low negative input end for crossing flow point comparison circuit 322.
Positive input terminal of the low positive input terminal for crossing flow point comparison circuit 322 as low overcurrent point protection circuit 320；Low overcurrent
Output end of the output end of point comparison circuit 322 as low overcurrent point protection circuit 320.
In actual operation, when the input terminal of low flow point configuration circuit 321 excessively receives low flow point signal excessively, according to low
Flow point signal, configuration negative overcurrent protection value corresponding with low flow point signal excessively are crossed, and is exported to low flow point comparison circuit 322 excessively
Negative input end；The sampled value that inverter circuit 600 exchanges side phase current is received in the low positive input terminal for crossing flow point comparison circuit 322
Afterwards, the sampled value that inverter circuit 600 exchanges side negative sense phase current is compared with negative overcurrent protection value, if inverter circuit 600
The absolute value for exchanging the sampled value of side negative sense phase current is greater than the absolute value of negative overcurrent protection value, then exports closing control signal,
Control driving circuit 500 stops working；If the absolute value that inverter circuit 600 exchanges the sampled value of side negative sense phase current is less than or equal to
The absolute value of negative overcurrent protection value does not control driving circuit 500 then.
In practical applications, low specific structure such as Fig. 4 for crossing flow point configuration circuit 321, comprising: the tenth resistance R10, the tenth
One resistance R11, twelfth resistor R12, thirteenth resistor R13, the 14th resistance R14, the 15th resistance R15, the 16th resistance
R16, the 7th capacitor C7, the 8th capacitor C8, the 9th capacitor C9 and the tenth capacitor C10.
Twelfth resistor R12, thirteenth resistor R13 and the 14th resistance R14 are sequentially connected in series, concatenated one end, the tenth
One end of one resistance R11 and the 7th one end capacitor C7 are connected；The concatenated other end is connected with one end of the tenth capacitor C10,
Tie point is as the low output end for crossing flow point configuration circuit 321.
The other end of eleventh resistor R11 is connected with one end of the tenth resistance R10, and tie point crosses flow point configuration electricity as low
The input terminal on road 321.
One end of 15th resistance R15 is connected with the tie point of twelfth resistor R12 and thirteenth resistor R13, and the 15th
The other end of resistance R15 is connected with one end of the 8th capacitor C8.
One end of 16th resistance R16 is connected with the tie point of thirteenth resistor R13 and the 14th resistance R14, and the 16th
The other end of resistance R16 is connected with one end of the 9th capacitor C9.
The other end of tenth resistance R10, the other end of the 7th capacitor C7, the 8th capacitor C8 the other end, the 9th capacitor C9
The other end, the tenth capacitor C10 the other end be grounded.
In practical applications, low specific structure such as Fig. 4 for crossing flow point comparison circuit 322, comprising: the 17th resistance R17, the
18 resistance R18, the 11st capacitor C11, the 12nd capacitor C12 and second operational amplifier U2A.
One end of 17th resistance R17 is as the low positive input terminal for crossing flow point comparison circuit 322.
The other end of 17th resistance R17 is connected with one end of the 11st capacitor C11, tie point and second operational amplifier
The non-inverting input terminal of U2A is connected.
One end of 18th resistance R18 is connected with one end of the 12nd capacitor C12, and tie point is more electric as low flow point excessively
The negative input end on road 322.
The other end of 18th resistance R18 is connected with the inverting input terminal of second operational amplifier U2A.
The other end of 11st capacitor C11 and the other end of the 12nd capacitor C12 are grounded.
The output end of second operational amplifier U2A is as the low output end for crossing flow point comparison circuit 322.
In practical applications, the specific structure of auxiliary circuit 330 such as Fig. 4, comprising: the electricity of the 19th resistance R19 and the 13rd
Hold C13.
First end of the one end of 13rd capacitor C13 as auxiliary circuit 330, the other end of the 13rd capacitor C13 and
One end of 19 resistance R19 is connected, third end of the tie point as auxiliary circuit 330；The other end conduct of 19th resistance R19
The second end of auxiliary circuit 330.
In addition, it includes exceeding flow point configuration circuit 311 and exceeding flow point ratio that Fig. 4, which is shown when exceeding flow point protection circuit 310,
Compared with circuit 312, and low overcurrent point protection circuit 320 includes low flow point configuration circuit 321 excessively and low flow point comparison circuit 322 excessively
When, exceed flow point configuration circuit 311, exceed flow point comparison circuit 312, low flow point configuration circuit 321 excessively and low flow point ratio excessively
Compared with the particular circuit configurations of circuit 322, in practical application, it is not limited to that circuit structure, can also be that other are realized therewith
The circuit structure of identical function, can be depending on the circumstances, can be realized the scheme of corresponding multilevel iudge function in the application
Protection scope in.
In addition, Fig. 4 is also shown the particular circuit configurations of auxiliary circuit 330, in practical application, it is not limited to that circuit knot
Structure can also be that other realize the circuit structure of identical function therewith, can be depending on the circumstances, but in the protection of the application
In range.
Remaining structure and working principle are same as the previously described embodiments, no longer repeat one by one herein.
Another embodiment of the application provides a kind of electric machine controller, and such as Fig. 1 a or Fig. 1 b, specific structure includes: control circuit
400, the alternate protection electricity that driving circuit 500, inverter circuit 600, current sampling circuit 700 and any of the above-described embodiment provide
Road.
The output end of current sampling circuit 700 is connected with the current sample input terminal of control circuit 400.
It should be noted that in practical applications, can be arranged between current sampling circuit 700 and control circuit 400 auxiliary
It helps resistance (being not drawn into figure), and also passes through auxiliary capacitor at auxiliary resistance and the tie point of control circuit 400 and (do not drawn in figure
It is grounded out).
Each output end of control circuit 400 input terminal corresponding with driving circuit 500 is connected.
Each output end of driving circuit 500 control terminal corresponding with inverter circuit 600 is connected.
In actual operation, current sampling circuit 700 samples the phase current that inverter circuit 600 exchanges side, and inversion is electric
The sampled value that road 600 exchanges side phase current is exported to the current sample input terminal of control circuit 400；Control circuit 400 is according to inverse
Power transformation road 600 exchanges the sampled value of side phase current, generates multiple PWM (Pulse width modulation, pulse width tune
System) control signal, and exported by corresponding output end to the corresponding input terminal of driving circuit 500；Through overdrive circuit 500
After processing, then by treated, multiple pwm control signals are exported to the control accordingly of inverter circuit 600 by corresponding output end
End, adjustment inverter circuit 600 exchange the output of side, to complete the closed-loop current control for exchanging inverter circuit 600 side output.
Optionally, inverter circuit 600 can be three-phase inverting circuit, be also possible to single-phase inversion circuit, do not limit herein
Fixed, the type of visible communicative motor is chosen, but within the scope of protection of this application.
Optionally, control circuit 400 can be controlled for DSP (Digital Signal Processing, Digital Signal Processing)
Circuit processed, or MCU (Micro Control Unit, micro-control unit), herein without limitation, visual concrete condition and
It is fixed, but within the scope of protection of this application.
In practical applications, when inverter circuit 600 is three-phase inverting circuit, specific structure is as shown in Figure 5, comprising: the
One switching tube M1, second switch M2, third switching tube M3, the 4th switching tube M4, the 5th switching tube M5, the 6th switching tube M6,
First diode Z1, the second diode Z2, third diode Z3, the 4th diode Z4, the 5th diode Z5, the 6th diode
Z6, the 14th capacitor C14, the 15th capacitor C15 and the 16th capacitor C16.
The output end of first switch tube M1 is connected with the input terminal of second switch M2, and tie point is as inverter circuit 600
The first phase output terminal；The output end of third switching tube M3 is connected with the input terminal of the 4th switching tube M4, and tie point is as inversion
Second phase output terminal of circuit 600；The output end of 5th switching tube M5 is connected with the output input of the 6th switching tube M6, connection
Third phase output terminal of the point as inverter circuit 600.
The input terminal of first switch tube M1, the input terminal of third switching tube M3, the input terminal of the 5th switching tube M5, the 14th
One end of one end and the 16th capacitor C16 that electric C14 holds is connected, positive input terminal of the tie point as inverter circuit 600.
The output end of second switch M2, the output end of the 4th switching tube M4, the output end of the 6th switching tube M6, the 15th
The other end of one end of capacitor C15 and the 16th capacitor C16 are connected, negative input end of the tie point as inverter circuit 600.
The other end of 14th capacitor C14 and the other end of the 15th capacitor C15 are connected, tie point ground connection.
First diode Z1 is connected anti-parallel between the input terminal and output end of first switch tube M1；Second diode Z2 is anti-
To being parallel between the input terminal and output end of second switch M2；Third diode Z3 is connected anti-parallel to third switching tube M3's
Between input terminal and output end；4th diode Z4 is connected anti-parallel between the input terminal and output end of the 4th switching tube M4；The
Five diode Z5 are connected anti-parallel between the input terminal and output end of the 5th open pipe pipe M5；6th diode Z6 is connected anti-parallel to
Between the input terminal and output end of six switching tube M6.
The control terminal of each switching tube is as the corresponding control terminal of inverter circuit 600.
Optionally, each switching tube can be MOSFET, is also possible to IGBT, is not specifically limited herein, can be optionally
Depending on, within the scope of protection of this application.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for system or
For system embodiment, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to method
The part of embodiment illustrates.System and system embodiment described above is only schematical, wherein the conduct
The unit of separate part description may or may not be physically separated, component shown as a unit can be or
Person may not be physical unit, it can and it is in one place, or may be distributed over multiple network units.It can root
According to actual need that some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment.Ordinary skill
Personnel can understand and implement without creative efforts.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (14)
1. a kind of alternate protection circuit of electric machine controller characterized by comprising temperature sampling circuit, control unit and
Hardware current foldback circuit；Wherein:
The temperature sampling circuit is for sampling the temperature of inverter circuit and output in the electric machine controller；
Described control unit is used to cross the temperature of flow relation and the inverter circuit according to preset temperature, determining electric with the inversion
The temperature on road is corresponding to be crossed flow point signal and exports；
The hardware current foldback circuit is for receiving current sampling circuit in the flow point signal excessively and the electric machine controller
The sampled value of the inverter circuit exchange side phase current of output；When the inverter circuit exchanges the exhausted of the sampled value of side phase current
When being greater than the absolute value for crossing the corresponding overcurrent protection value of flow point signal to value, the driving electricity in the electric machine controller is controlled
Road stops working.
2. alternate protection circuit according to claim 1, which is characterized in that the preset temperature crosses flow relation are as follows: described
The voltage endurance curve that control unit is varied with temperature according to the power semiconductor in the inverter circuit, measures
Corresponding relationship between the temperature of the inverter circuit and excessively flow point signal.
3. alternate protection circuit according to claim 1, which is characterized in that the flow point signal of crossing includes that low flow point of crossing is believed
Number and exceed flow point signal；
Described control unit is exported the flow point signal that exceeds to the hardware current foldback circuit by high overcurrent output end
High overcurrent input terminal；
Described control unit is exported the low flow point signal of crossing to the hardware current foldback circuit by low overcurrent output end
Low overcurrent input terminal.
4. alternate protection circuit according to claim 3, which is characterized in that the hardware current foldback circuit, comprising: high
Overcurrent point protection circuit, low overcurrent point protection circuit and auxiliary circuit；Wherein:
High overcurrent input terminal of the positive input terminal for exceeding flow point protection circuit as the hardware current foldback circuit；
Low overcurrent input terminal of the negative input end of the low overcurrent point protection circuit as the hardware current foldback circuit；
The negative input end for exceeding flow point protection circuit is connected with the positive input terminal of the low overcurrent point protection circuit, tie point
Receive the sampled value of the inverter circuit exchange side phase current of the current sampling circuit output；
The output end and the auxiliary circuit of the output end for exceeding flow point protection circuit, the low overcurrent point protection circuit
Third end be connected, tie point is connected with the logic control end of the driving circuit；
The first end of the auxiliary circuit is grounded, and the second end of the auxiliary circuit accesses predeterminated voltage.
5. alternate protection circuit according to claim 4, which is characterized in that the flow point protection circuit that exceeds includes: height
It crosses flow point configuration circuit and exceeds flow point comparison circuit；The low overcurrent point protection circuit include: it is low cross flow point configuration circuit and
It is low to cross flow point comparison circuit；Wherein:
The input terminal for exceeding flow point configuration circuit exceeds the positive input terminal of flow point protection circuit as described in；
The output end for exceeding flow point configuration circuit is connected with the positive input terminal for exceeding flow point comparison circuit；
The negative input end for exceeding flow point comparison circuit exceeds the negative input end of flow point protection circuit as described in；
The output end for exceeding flow point comparison circuit exceeds the output end of flow point protection circuit as described in；
Negative input end of the low input terminal for crossing flow point configuration circuit as the low overcurrent point protection circuit；
The low output end for crossing flow point configuration circuit is connected with the low negative input end for crossing flow point comparison circuit；
Positive input terminal of the low positive input terminal for crossing flow point comparison circuit as the low overcurrent point protection circuit；
Output end of the low output end for crossing flow point comparison circuit as the low overcurrent point protection circuit.
6. alternate protection circuit according to claim 5, which is characterized in that described to exceed flow point configuration circuit, comprising: the
One resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, first capacitor, the second electricity
Appearance, third capacitor and the 4th capacitor；Wherein:
The 3rd resistor, the 5th resistance and the 7th resistance are sequentially connected in series, concatenated one end, the second resistance
One end and the first capacitor one end be connected；The concatenated other end is connected with one end of the 4th capacitor, connection
Point exceeds the output end of flow point configuration circuit as described in；
The other end of the second resistance is connected with one end of the first resistor, and flow point configuration electricity is exceeded described in tie point conduct
The input terminal on road；The other end of the first resistor accesses the predeterminated voltage；
One end of 4th resistance is connected with the tie point of the 3rd resistor and the 5th resistance, the 4th resistance
The other end is connected with one end of second capacitor；
One end of the 6th electricity group is connected with the tie point of the 5th resistance and the 7th resistance, the 6th resistance
The other end is connected with one end of the third capacitor；
The other end of the first capacitor, the other end of second capacitor, the other end of the third capacitor and described
The other end of four capacitors is grounded.
7. alternate protection circuit according to claim 5, which is characterized in that described to exceed flow point comparison circuit, comprising: the
Eight resistance, the 9th resistance, the 5th capacitor, the 6th capacitor and the first operational amplifier；Wherein:
One end of 8th resistance is connected with one end of the 5th capacitor, exceeds flow point comparison circuit described in tie point conduct
Positive input terminal；
The other end of 8th resistance is connected with the first operational amplifier non-inverting input terminal；
One end of 9th resistance exceeds the negative input end of flow point comparison circuit as described in；
The other end of 9th resistance is connected with one end of the 6th capacitor, tie point and first operational amplifier
Inverting input terminal is connected；
The other end of 5th capacitor and the other end of the 6th capacitor are grounded；
The output end of first operational amplifier exceeds the output end of flow point comparison circuit as described in.
8. alternate protection circuit according to claim 5, which is characterized in that the low flow point configuration circuit excessively, comprising: the
Ten resistance, eleventh resistor, twelfth resistor, thirteenth resistor, the 14th resistance, the 15th resistance, the 16th resistance, the 7th
Capacitor, the 8th capacitor, the 9th capacitor and the tenth capacitor；Wherein:
The twelfth resistor, the thirteenth resistor and the 14th resistance are sequentially connected in series, concatenated one end, described
One end of 11 resistance and described 7th capacitor one end are connected；One end phase of the concatenated other end and the tenth capacitor
Even, tie point is as the low output end for crossing flow point configuration circuit；
The other end of the eleventh resistor is connected with one end of the tenth resistance, and tie point is configured as the low flow point of crossing
The input terminal of circuit；
One end of 15th resistance is connected with the tie point of the twelfth resistor and the thirteenth resistor, and the described tenth
The other end of five resistance is connected with one end of the 8th capacitor；
One end of 16th resistance is connected with the tie point of the thirteenth resistor and the 14th resistance, and the described tenth
The other end of six resistance is connected with one end of the 9th capacitor；
The other end of tenth resistance, the other end of the 7th capacitor, the other end of the 8th capacitor, the 9th electricity
The other end of the other end of appearance and the tenth capacitor is grounded.
9. alternate protection circuit according to claim 5, which is characterized in that the low flow point comparison circuit excessively, comprising: the
17 resistance, the 18th resistance, the 11st capacitor, the 12nd capacitor and second operational amplifier；Wherein:
One end of 17th resistance is as the low positive input terminal for crossing flow point comparison circuit；
The other end of 17th resistance is connected with one end of the 11st capacitor, tie point and second operation amplifier
The non-inverting input terminal of device is connected；
One end of 18th resistance is connected with one end of the 12nd capacitor, and tie point compares as the low flow point of crossing
The negative input end of circuit；
The other end of 18th resistance is connected with the inverting input terminal of the second operational amplifier；
The other end of 11st capacitor and the other end of the 12nd capacitor are grounded；
The output end of the second operational amplifier is as the low output end for crossing flow point comparison circuit.
10. alternate protection circuit according to claim 4, which is characterized in that the auxiliary circuit, comprising: the 19th electricity
Resistance and the 13rd capacitor；Wherein:
First end of the one end of 13rd capacitor as the auxiliary circuit, the other end of the 13rd capacitor with it is described
One end of 19th resistance is connected, third end of the tie point as the auxiliary circuit；The other end of 19th resistance is made
For the second end of the auxiliary circuit.
11. -10 described in any item alternate protection circuits according to claim 1, which is characterized in that described control unit independently of
Control circuit in the electric machine controller, alternatively, being integrated in the control circuit.
12. a kind of electric machine controller characterized by comprising control circuit, driving circuit, inverter circuit, current sampling circuit
And such as the described in any item alternate protection circuits of claim 1-11；Wherein:
The output end of the current sampling circuit is connected with the current sample input terminal of the control circuit；
Each output end of control circuit input terminal corresponding with the driving circuit is connected；
Each output end of driving circuit control terminal corresponding with the inverter circuit is connected.
13. electric machine controller according to claim 12, which is characterized in that the inverter circuit be three-phase inverting circuit or
Single-phase inversion circuit.
14. electric machine controller according to claim 13, which is characterized in that the control circuit is Digital Signal Processing control
Circuit DSP control circuit processed or micro-control unit MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910807402.5A CN110460018A (en) | 2019-08-29 | 2019-08-29 | A kind of electric machine controller and its alternate protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910807402.5A CN110460018A (en) | 2019-08-29 | 2019-08-29 | A kind of electric machine controller and its alternate protection circuit |
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| CN110460018A true CN110460018A (en) | 2019-11-15 |
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| CN113725809A (en) * | 2021-09-01 | 2021-11-30 | 重庆川仪自动化股份有限公司 | Overcurrent protection circuit for three-phase AC circuit |
| CN113794394A (en) * | 2021-08-12 | 2021-12-14 | 杭州先途电子有限公司 | Controller and control circuit |
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