CN209878872U - Converter voltage detection circuitry - Google Patents
Converter voltage detection circuitry Download PDFInfo
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- CN209878872U CN209878872U CN201920555915.7U CN201920555915U CN209878872U CN 209878872 U CN209878872 U CN 209878872U CN 201920555915 U CN201920555915 U CN 201920555915U CN 209878872 U CN209878872 U CN 209878872U
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- 238000005070 sampling Methods 0.000 claims abstract description 39
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- 239000003990 capacitor Substances 0.000 claims description 33
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Abstract
The utility model relates to a converter technical field discloses a converter voltage detection circuit that driving voltage is stable, and it includes: the first resistor and the second resistor are connected to form a sampling circuit, the sampling circuit is used for detecting signals output by the IGBT, and the other end of the second resistor is coupled to a signal input end of the first integrated circuit and inputs the sampling signals into the first integrated circuit; the signal output end of the first integrated circuit is connected with the inverting input end of the amplifier, the signal output end of the amplifier is connected with the inverting input end of the comparator, and the sampling signal is input into the comparator; the non-inverting input end of the comparator is coupled to the signal output end of the controller, the controller inputs the reference signal into the comparator to be compared with the sampling signal in the comparator, if the sampling signal is higher than or lower than the threshold range of the reference signal, the comparator outputs a low level signal, and the low level signal is used for blocking the driving signal of the IGBT to enable the IGBT to be cut off.
Description
Technical Field
The utility model relates to a converter technical field, more specifically say, relate to a converter voltage detection circuit.
Background
The frequency converter is a power control device which controls the operation of an alternating current motor by adjusting the frequency of a working power supply by applying a frequency conversion technology and an electronic technology. In the past, when the frequency converter outputs voltage to a load, large current remains in a circuit, so that a bridge stack is easily broken down by reverse current, and the use cost of the frequency converter is increased when the frequency converter is used for a long time.
Therefore, in the prior art, a frequency converter with good current discharge capacity is provided, and the service life of a bridge stack can be effectively prolonged. However, when the inverter circuit of the conventional inverter outputs a voltage, a driving voltage of an IGBT (Insulated Gate bipolar transistor) fluctuates greatly, and the IGBT is easily affected by the fluctuating voltage, so that the temperature of the IGBT increases sharply, and the IGBT fails after a long time of use.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a converter voltage detection circuit that driving voltage is stable.
The utility model provides a technical scheme that its technical problem adopted is: a voltage detection circuit of a frequency converter is constructed, which comprises a first resistor, a second resistor, a first integrated circuit, an amplifier, a comparator and a controller,
one end of the first resistor is connected with one end of the second resistor to form a sampling circuit, the sampling circuit is used for detecting signals output by the IGBT,
the other end of the second resistor is coupled to a signal input end of the first integrated circuit and inputs a sampling signal into the first integrated circuit;
the signal output end of the first integrated circuit is connected with the inverting input end of the amplifier, the signal output end of the amplifier is connected with the inverting input end of the comparator, and the sampling signal is input into the comparator;
the non-inverting input end of the comparator is coupled to the signal output end of the controller, the controller inputs a reference signal into the comparator to be compared with the sampling signal in the comparator, if the sampling signal is higher than or lower than the threshold range of the reference signal, the comparator outputs a low level signal, and the low level signal is used for blocking the driving signal of the IGBT to enable the IGBT to be cut off.
Optionally, the integrated circuit further comprises a diode and a second integrated circuit, a cathode of the diode is connected to a signal input terminal of the second integrated circuit, and a signal output terminal of the second integrated circuit is coupled to a voltage input terminal of the first integrated circuit.
Optionally, the amplifier further comprises an adjustable resistor, one end of the adjustable resistor is connected to the signal output end of the amplifier, and an adjusting end of the adjustable resistor is coupled to the inverting input end of the comparator.
Optionally, the integrated circuit further comprises a first capacitor and a second capacitor, one end of the first capacitor and one end of the second capacitor are commonly connected to the signal input end of the second integrated circuit, and the other end of the first capacitor and the other end of the second capacitor are connected to a common end.
Optionally, the integrated circuit further includes a fourth resistor and a fifth resistor, one end of the fourth resistor is connected to one end of the fifth resistor, and the other end of the fifth resistor is coupled to the signal input terminal of the first integrated circuit.
Optionally, the circuit further includes an eleventh resistor, one end of the eleventh resistor is connected to the signal output end of the controller, and the other end of the eleventh resistor is coupled to the non-inverting input end of the comparator.
Among the converter voltage detection circuitry, including the sampling circuit that first resistance and second resistance are constituteed, first integrated circuit, amplifier, comparator and controller. The sampling circuit inputs a sampling signal into the first integrated circuit, the first integrated circuit isolates the sampling signal by strong current and weak current and then inputs the signal into the amplifier, and the amplifier amplifies the sampling signal and then inputs the signal into the comparator. The non-inverting input end of the controller is connected with the signal output end of the comparator, the reference signal is input into the comparator and compared with the sampling signal in the comparator, if the sampling signal exceeds the threshold range of the reference signal, the comparator outputs a low level signal, and the low level signal is used for blocking the driving signal of the IGBT to enable the IGBT to be cut off.
Compared with the prior art, the utility model discloses can compare with the input voltage detected signal through reference voltage value, judge the magnitude of voltage of IGBT operation, control IGBT, reduce IGBT effectively and receive fluctuating voltage's influence, prolong IGBT's life.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
FIG. 1 is a schematic circuit diagram of a portion of a frequency converter voltage detection circuit;
fig. 2 is another circuit schematic of the inverter voltage detection circuit.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a partial circuit schematic diagram of a converter voltage detection circuit, and fig. 2 is another partial circuit schematic diagram of the converter voltage detection circuit. As shown in fig. 1 and fig. 2, the inverter voltage detection circuit mainly includes a first resistor R1, a second resistor R2, a first integrated circuit IC1, an amplifier U1, a controller U2, and a comparator U3. Specifically, one end of the first resistor R1 is connected to one end of the second resistor R2, the other end of the first resistor R1 is connected to the P-end of the IGBT output loop, and the other end of the second resistor R2 is commonly connected to the N-end of the IGBT output loop and the signal input end of the first integrated circuit IC 1.
The first resistor R1 and the second resistor R2 form a sampling circuit, which is used to detect the voltage value of the dc loop, perform resistance voltage reduction and voltage division, and input the mV-level voltage signal obtained by voltage division into the first integrated circuit IC 1.
The first integrated circuit IC1 has the function of isolating strong and weak currents and has the function of operation. Specifically, the first IC1 has eight pins, pin 1 being a voltage input terminal, pin 2 being a first signal input terminal, pin 3 being a second signal input terminal, pins 4 and 5 being common terminals, pin 6 being a signal output terminal, pin 7 being a driving signal output terminal, and pin 8 being a voltage output terminal. The first signal input terminal of the first integrated circuit IC1 is connected to one terminal of the second resistor R2, and receives the sampling signal input by the sampling circuit. Further, the signal output of the first integrated circuit IC1 is connected to the inverting input of the amplifier U1, and the first integrated circuit IC1 will employ the signal input amplifier U1.
Specifically, the amplifier U1 has a signal amplification effect. The non-inverting input of the amplifier U1 is coupled to the driving signal output of the first IC1, and the inverting input of the amplifier U1 is coupled to the signal output of the first IC 1. The first integrated circuit IC1 inputs a drive signal to the amplifier U1 to trigger the amplifier U1, and amplifies the sampling signal to a voltage of about 3V. At the same time, the signal output of amplifier U1 is connected to the inverting input of comparator U3.
The comparator U3 is used to compare the magnitudes of two voltages (the magnitude relationship between the two input voltages is represented by the high or low level of the output voltage): when the voltage of the plus is higher than the voltage of the minus input end, the output of the voltage comparator is high level; when the voltage at the "+" input terminal is lower than that at the "-" input terminal, the output of the voltage comparator is at low level. Specifically, the inverting input terminal of the comparator U3 is connected to the signal output terminal of the amplifier U1, and the sampling signal is input to the comparator U3.
Specifically, the controller U2 functions in the present circuit to exchange signals, control and monitor the operating voltage condition of the IGBTs, and the like. Controller U2 has a signal output (i.e., Vref: reference voltage), a voltage input (i.e., vcc terminal), and a signal input (i.e., vin terminal). The voltage input of the controller U2 is connected with a 5V power supply voltage for driving the comparator U3.
Further, a signal output end of the controller U2 is coupled to a non-inverting input end of the comparator U3, and inputs a reference signal into the comparator U3 to be compared with the sampling signal in the comparator U3, if the sampling signal is within a threshold range of the reference signal, the comparator U3 outputs a high level signal, and the driving circuit driving the IGBT outputs a driving signal; if the sampled signal is above or below the threshold range of the reference signal, the comparator U3 outputs a low signal to the peripheral circuits. The low level is input to the controller U2 through a peripheral circuit, and a low level signal is input to the drive circuit of the IGBT by the controller U2, so that the drive pulse of the IGBT is cut off and the IGBT is turned off.
In this embodiment mode, a diode, a first capacitor, a second capacitor, a third capacitor, and a second integrated circuit may be provided in a circuit to improve the stability of a power supply. Specifically, the diode D1 has a rectifying function, the first capacitor C1, the second capacitor C2 and the third capacitor C3 have a filtering function, and the second integrated circuit IC2 has a voltage stabilizing function. The anode of the diode D1 is connected to one end of the secondary winding of the transformer Tr, the cathode of the diode D1 is connected to one end of the first capacitor C1, one end of the second capacitor C2 and the signal input end of the second integrated circuit IC2, the other end of the first capacitor C1 and the other end of the second capacitor C2 are connected to the common end of the circuit, the current is rectified by the diode D1 and then input to the filter circuit, and the current is filtered by the filter circuit and then input to the second integrated circuit IC 2. The second integrated circuit IC2 regulates the input voltage to 5V and outputs the regulated voltage. The signal output terminal of the second IC2 is coupled to the third capacitor C3, and the output 5V is input to the voltage input terminal of the first IC1 via the third capacitor C3.
In this embodiment, in order to improve the voltage reduction and division capability of the circuit resistor, a third resistor, a fourth resistor, and a fifth resistor may be provided in the circuit. Specifically, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 have the functions of voltage reduction and voltage division. One end of the third resistor R3 and one end of the fourth resistor R4 are commonly connected to the N-terminal of the dc loop, the other end of the third resistor R3 and the other end of the fourth resistor R4 are commonly connected to one end of the second fifth resistor R2 and one end of the fifth resistor R5, and the other end of the fifth resistor R5 is coupled to a signal input terminal of the first integrated circuit IC 1. The sampling signal obtained by the sampling circuit is input into the first integrated circuit IC1 through the fourth resistor R4 and the fifth resistor R5, and the input sampling signal is separated into a strong signal and a weak signal by the first integrated circuit IC1 and then output to the next stage circuit.
In this embodiment, a fourth capacitor may be provided in the circuit in order to improve the quality of the sampled signal. Specifically, the fourth capacitor C4 has the effect of eliminating high-frequency signal interference. One end of the fourth capacitor C4 is connected to one end of the fifth resistor R5 and the signal input terminal of the first integrated circuit IC1, and the other end of the fourth capacitor C4 is coupled to the second signal input terminal of the first integrated circuit IC1, so that the first integrated circuit IC1 obtains a sampling signal with higher quality.
In this embodiment, in order to improve the quality of the circuit signal transmission, a fifth capacitor, a sixth resistor, a seventh resistor, an eighth resistor, and a sixth capacitor may be provided in the circuit. Specifically, one end of the fifth capacitor C5 is connected to the common terminal of the first integrated circuit IC1, and the other end of the fifth capacitor C5 is coupled to the voltage output terminal of the first integrated circuit IC 1. One end of the sixth resistor R6 is coupled to the driving signal output terminal of the first integrated circuit IC1, and the other end of the sixth resistor R6 is connected to the non-inverting input terminal of the amplifier U1. One end of the seventh resistor R7 is coupled to the signal output terminal of the first IC1, and the other end of the seventh resistor R7 is coupled to the inverting input terminal of the amplifier U1, so that the sampling signal isolated by the first IC1 is input to the amplifier U1 via the seventh resistor R7.
Furthermore, one end of the eighth resistor R8 is connected to the non-inverting input terminal of the amplifier U1, and the other end of the eighth resistor R8 is connected to the common terminal of the circuit. The sixth capacitor C6 is connected to two ends of the eighth resistor R8.
In this embodiment, a ninth resistor may be provided in the circuit to improve the signal processing quality of the amplifier U1. Specifically, the ninth resistor R9 is a feedback resistor, one end of the ninth resistor R9 is connected to the inverting input terminal of the amplifier U1, and the other end of the ninth resistor R9 is coupled to the signal output terminal of the amplifier U1. A part of the sampling signal output after being amplified by the amplifier U1 is fed back to the inverting input end through the ninth resistor R9, is overlapped with the input signal, and is input into the amplifier U1 again, so that the quality parameter of the input signal is improved.
In this embodiment, in order to enhance the adjustability of the circuit for signals, an adjustable resistor and a tenth resistor may be provided in the circuit. Specifically, one end of the adjustable resistor RP is connected to the signal output end of the amplifier U1, the other end of the adjustable resistor RP is coupled to one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to the common terminal of the circuit, and the adjustable end of the adjustable resistor RP is connected to the inverting input end of the comparator U3 through the terminal CN 1. The voltage value of the sampling signal input to the comparator U3 is 3V.
Furthermore, an eleventh resistor R11 is connected to a signal output terminal of the controller U2, and the other end of the eleventh resistor R11 is connected to a non-inverting input terminal of the comparator U3.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (6)
1. A voltage detection circuit of a frequency converter is characterized by comprising a first resistor, a second resistor, a first integrated circuit, an amplifier, a comparator and a controller,
one end of the first resistor is connected with one end of the second resistor to form a sampling circuit, the sampling circuit is used for detecting signals output by the IGBT,
the other end of the second resistor is coupled to a signal input end of the first integrated circuit and inputs a sampling signal into the first integrated circuit;
the signal output end of the first integrated circuit is connected with the inverting input end of the amplifier, the signal output end of the amplifier is connected with the inverting input end of the comparator, and the sampling signal is input into the comparator;
the non-inverting input end of the comparator is coupled to the signal output end of the controller, the controller inputs a reference signal into the comparator to be compared with the sampling signal in the comparator, if the sampling signal is higher than or lower than the threshold range of the reference signal, the comparator outputs a low level signal, and the low level signal is used for blocking the driving signal of the IGBT to enable the IGBT to be cut off.
2. The frequency converter voltage detection circuit of claim 1, further comprising a diode and a second integrated circuit, a cathode of the diode being connected to a signal input of the second integrated circuit, a signal output of the second integrated circuit being coupled to a voltage input of the first integrated circuit.
3. The converter voltage detection circuit of claim 1, further comprising an adjustable resistor, wherein one end of the adjustable resistor is connected to the signal output terminal of the amplifier, and the adjustment terminal of the adjustable resistor is coupled to the inverting input terminal of the comparator.
4. The converter voltage detection circuit of claim 2, further comprising a first capacitor and a second capacitor, wherein one end of the first capacitor and one end of the second capacitor are commonly connected to the signal input terminal of the second integrated circuit, and the other end of the first capacitor and the other end of the second capacitor are connected to a common terminal.
5. The converter voltage detection circuit according to claim 1 or 2, further comprising a fourth resistor and a fifth resistor, wherein one end of the fourth resistor is connected to one end of the fifth resistor, and the other end of the fifth resistor is coupled to the signal input terminal of the first integrated circuit.
6. The frequency converter voltage detection circuit according to claim 1, further comprising an eleventh resistor, wherein one end of the eleventh resistor is connected to the signal output terminal of the controller, and the other end of the eleventh resistor is coupled to the non-inverting input terminal of the comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920555915.7U CN209878872U (en) | 2019-04-19 | 2019-04-19 | Converter voltage detection circuitry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920555915.7U CN209878872U (en) | 2019-04-19 | 2019-04-19 | Converter voltage detection circuitry |
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| Publication Number | Publication Date |
|---|---|
| CN209878872U true CN209878872U (en) | 2019-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920555915.7U Active CN209878872U (en) | 2019-04-19 | 2019-04-19 | Converter voltage detection circuitry |
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|---|---|
| CN (1) | CN209878872U (en) |
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- 2019-04-19 CN CN201920555915.7U patent/CN209878872U/en active Active
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