CN103138590B - Current-limiting protection method and device of resonance circuit - Google Patents
Current-limiting protection method and device of resonance circuit Download PDFInfo
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- CN103138590B CN103138590B CN201110394777.7A CN201110394777A CN103138590B CN 103138590 B CN103138590 B CN 103138590B CN 201110394777 A CN201110394777 A CN 201110394777A CN 103138590 B CN103138590 B CN 103138590B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/337—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
- H02M3/3376—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration with automatic control of output voltage or current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a current-limiting protection method and a device of a resonance circuit. The method comprises the steps of detecting voltages of two ends of a sampling resistor flowed through by a resonance current in the resonance circuit, blocking drive of the resonance circuit when the detected voltages of the two ends of the sampling resistor on a current resonance period are larger than a preset threshold value, and switching the resonance circuit from a constant mode to an output current-limiting mode when a next pulse width modulation period arrives. A strategy of the current-limiting protection method and the device of the resonance circuit that when wave-following limit currents are detected, a logical link control (LLC) resonant converter is enabled to immediately enter a current-limiting mode in control and enables a primary side current to rapidly drop within the threshold value, the technical problem that voltage stress of a full-bridge tube exceeds the standard due to continuous wave-following current limiting is solved, and reliability of a switch power source and reliability of power devices are improved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of resonance circuit current limiting protecting method and device.
Background technology
High efficiency high power high density is an important development trend of power electronic product, full-bridge LLC resonance DC/DC
The outstanding advantage that changer has in terms of conversion efficiency and power density by it, has obtained a lot of Switching Power Supply tradesmans
Favor.
Currently for full-bridge LLC resonance DC/DC changer, when there is wave limiting, the full-bridge of block LLC changer
Four drivings of pipe, reopen this four drivings after a period of time again.Block full-bridge pipe when wave limiting occurs immediately
Four drivings, full-bridge LLC resonance circuit will enter self-resonance state.When the down tube of the advanced arm of full-bridge carries out afterflow, if
Now the action of wave limiting completes, needs to reopen four drivings of the full-bridge pipe of LLC changer.If open is
The corresponding driving of V1, V4, because V2 has reverse recovery current, then V1, V2 occur common phenomenon, and the voltage stress of V2 is different
Often；In the same manner, when the down tube of full-bridge lagging leg carries out afterflow, if now the action of wave limiting also completes, need again
Open four drivings of the full-bridge pipe of LLC changer, if that open is V2, the corresponding driving of V3, because V4 presence is reversely extensive
Telegram in reply stream, then V3, V4 occur common phenomenon, and the voltage stress of V4 is abnormal.
For above-mentioned restart driving after wave limiting terminates when full-bridge pipe voltage stress may exceeded problem, especially
It is the repeatedly exceeded problem of the full-bridge switch pipe pressure causing during continuous wave limiting, not yet propose effective solution party at present
Case.
Content of the invention
The invention provides a kind of resonance circuit current limiting protecting method and device, with least solve in prior art continuous by
The exceeded technical problem of the full-bridge tube voltage stress that causes during ripple current limliting.
According to an aspect of the invention, it is provided a kind of resonance circuit current limiting protecting method, including：Detection resonance circuit
The voltage at the sampling resistor two ends that middle resonance current flows through；Voltage sampling resistor two ends is detected on current harmonic period is big
When predetermined threshold, the driving of block resonance circuit；When next pulse width modulation cycle arrives, by resonance circuit by constant voltage mould
Formula is switched to output current limiting pattern.
Preferably, resonance circuit is included by the step that constant voltage mode is switched to output current limiting pattern：When resonance is detected
When the output signal level of the comparator of circuit occurs reversion, by the electric current loop output signal of a upper harmonic period and upper one
The electric current loop error signal of harmonic period resets；Produced for by resonance according to the electric current loop output signal of current harmonic period
Circuit is switched to the pulse-width signal of output current limiting pattern by constant voltage mode.
Preferably, the step of the driving of block resonance circuit includes：Block corresponding with direction of resonant current a pair to pipe
Drive.
Preferably, predetermined threshold includes：First predetermined threshold and the second predetermined threshold；Sampling resistor includes：First sampling
Resistance and the second sampling resistor；Pipe is driven and includes：First pair drives to pipe and second drives to pipe, wherein, block with humorous
The step that the sense of current that shakes drives to pipe for corresponding a pair includes：When the voltage at the first sampling resistor two ends is more than the first predetermined threshold
During value, block first drives to pipe；When the voltage at the second sampling resistor two ends is more than the second predetermined threshold, block second is right
Pipe is driven.
Preferably, after the driving of block resonance circuit, resonance circuit current limiting protecting method also includes：In current resonance
When the next harmonic period in cycle arrives, judge whether the former limit of resonance circuit excessively stream；If the former limit of resonance circuit
Excessively stream does not occur, then solves block to driving.
Preferably, the step of the voltage at sampling resistor two ends that detection resonance current flows through includes：By current transformer
Unsteady flow is carried out to resonance current；Rectification is carried out to the resonance current after unsteady flow by commutator；Resonance current stream after rectification
The two ends of the sampling resistor of warp carry out the voltage that voltage sample obtains sampling resistor two ends.
According to another aspect of the present invention, there is provided a kind of resonance circuit current-limiting protection device, including：Detector unit,
For detecting the voltage at sampling resistor two ends that in resonance circuit, resonance current flows through；Block unit, in current resonance week
When voltage sampling resistor two ends is detected on phase is more than predetermined threshold, the driving of block resonance circuit；Switch unit, for
When next pulse width modulation cycle arrives, resonance circuit is switched to output current limiting pattern by constant voltage mode.
Preferably, switch unit includes：Dump block, for when the output signal electricity of comparator resonance circuit is detected
During flat generation reversion, by the electric current loop error signal of the electric current loop output signal of a upper harmonic period and a upper harmonic period
Reset；Generation module, for according to the electric current loop output signal of current harmonic period produce for by resonance circuit by constant voltage
Pattern switching is to the pulse-width signal of output current limiting pattern.
Preferably, block unit includes：Lockout module, for detecting sampling resistor two ends on current harmonic period
When voltage is more than predetermined threshold, block drives to pipe for corresponding with direction of resonant current a pair.
Preferably, predetermined threshold includes：First predetermined threshold and the second predetermined threshold；Sampling resistor includes：First sampling
Resistance and the second sampling resistor；Pipe is driven and includes：First pair drives to pipe to pipe driving and second, wherein, lockout module
Including：First block submodule, when being more than the first predetermined threshold for the voltage at the first sampling resistor two ends, block first is right
Pipe is driven；Second block submodule, when being more than the second predetermined threshold for the voltage at the second sampling resistor two ends, block the
Two pairs drive to pipe.
Preferably, resonance circuit current-limiting protection device also includes：Judging unit, for the next one in current harmonic period
When harmonic period arrives, judge whether the former limit of resonance circuit excessively stream；Deblocking lock unit, in described resonance circuit
When former limit excessively stream, drive solution block to described.
In the present invention, LLC resonant converter is made in control after wave limiting is detected by interpolation in intelligent cell
The strategy of restrictor ring is immediately entered on system so that within primary current drops to threshold values rapidly, solving and make during continuous wave limiting
The exceeded technical problem of full-bridge tube voltage stress becoming, improves Switching Power Supply and the reliability of power device.Further, lead to
Cross the sense of current of detection resonance current, when resonance current exceedes current protection threshold values, according to the sense of current envelope detecting
Lock drives to pipe to reach the protection of LLC resonance circuit wave limiting for a pair, solves in prior art due in wave limiting
The problem of the time delay needing to block four drivings of full-bridge pipe and causing, has reached and has realized quick response to by the loop after ripple
Technique effect.
Brief description
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this
Bright schematic description and description is used for explaining the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is a kind of preferred structured flowchart of the resonance circuit current-limiting protection device according to the embodiment of the present invention；
Fig. 2 is another kind of preferably structured flowchart of the resonance circuit current-limiting protection device according to the embodiment of the present invention；
Fig. 3 is a kind of circuit diagram of the resonance circuit current-limiting protection according to the embodiment of the present invention；
Fig. 4 is another preferred structured flowchart of the resonance circuit current-limiting protection device according to the embodiment of the present invention；
Fig. 5 is another preferred structured flowchart of the resonance circuit current-limiting protection device according to the embodiment of the present invention；
Fig. 6 is another preferred structured flowchart of the resonance circuit current-limiting protection device according to the embodiment of the present invention；
Fig. 7 is another preferred structured flowchart of the resonance circuit current-limiting protection device according to the embodiment of the present invention；
Fig. 8 is a kind of preferred flow chart of the resonance circuit current limiting protecting method according to the embodiment of the present invention；
Fig. 9 is drive waveforms schematic diagram during the former limit excessively stream according to the embodiment of the present invention；
Figure 10 is another preferred structured flowchart of the resonance circuit current-limiting protection device according to the embodiment of the present invention.
Specific embodiment
To describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that not conflicting
In the case of, the embodiment in the application and the feature in embodiment can be mutually combined.
Embodiment 1
As shown in figure 1, the invention provides a kind of preferred resonance circuit current-limiting protection device, this device includes：Detection
Unit 102, for detecting the voltage at sampling resistor two ends that in resonance circuit, resonance current flows through；Block unit 104, for
When the voltage described sampling resistor two ends is detected on current harmonic period is more than predetermined threshold, block the drive of described resonance circuit
Dynamic；Switch unit 106, for when next pulse width modulation cycle arrives, described resonance circuit being switched to by constant voltage mode
Output current limiting pattern.
In above-mentioned preferred implementation, make LLC resonance after wave limiting is detected by adding in intelligent cell
Changer immediately enters the strategy of restrictor ring so that within primary current drops to threshold values rapidly on controlling, solve continuous by
The exceeded technical problem of the full-bridge tube voltage stress that causes during ripple current limliting, improves Switching Power Supply and the reliability of power device.
In a preferred embodiment of the present invention, as shown in Fig. 2 block unit 104 includes：Lockout module 202, uses
When the voltage described sampling resistor two ends is detected on current harmonic period is more than predetermined threshold, block is electric with described resonance
Stream direction drives to pipe for corresponding a pair.By detecting the sense of current of resonance current, when resonance current exceedes current protection valve
During value, block a pair according to the sense of current detecting and pipe is driven to reach the protection of LLC resonance circuit wave limiting, solve
The problem of the time delay causing due to needing in wave limiting to block four drivings of full-bridge pipe in prior art, it is right to have reached
Realize the technique effect of quick response by the loop after ripple.
Specifically, as shown in figure 3, resonance current to be changed into direct current through current transformer (CT) from high-frequency ac value effective
After value, pass through commutator and carry out rectification, sample finally by the voltage at sampling resistor two ends.Preferably, with Fig. 3
ILrThe sense of current is positive resonance current for just, then flowing through the electric current of sampling resistor R2, and the electric current flowing through sampling resistor R3 is
Negative sense resonance current, can be obtained by corresponding resonance current size by the voltage at R2 and R3 two ends of sampling, thus realizes
Detection to positive and negative resonance current.Preferably, work as VR2When exceeding predetermined threshold Vref, the driving of block V2 and V3；Work as VR3Super
When crossing predetermined threshold Vref, the driving of block V1 and V4, thus reached the purpose of wave limiting.
In a preferred embodiment of the invention, as shown in figure 4, switch unit 106 includes：Dump block 402, is used for
When the generation reversion of the output signal level of comparator of described resonance circuit is detected, by the electric current loop of a upper harmonic period
The electric current loop error signal of output signal and a upper harmonic period resets；Generation module 404, for according to described current resonance
The electric current loop output signal in cycle is producing the arteries and veins for described resonance circuit is switched to output current limiting pattern by constant voltage mode
Wide modulated signal.In the preferred embodiment, the method being switched to output current limiting pattern using pressure, improves prior art
In realized from constant voltage mode to current-limit mode by loop natural selection conversion, generally require 10 pulse width modulation cycles with
On could be completely into the situation of the mode of operation of output current limiting it is achieved that when electric current exceedes predetermined threshold value, in next arteries and veins
Resonance circuit just can be made wide modulation period to enter the effect of the mode of operation of output current limiting so that primary current drops to rapidly threshold values
Within, solve the exceeded technical problem of the full-bridge tube voltage stress causing during continuous wave limiting, improve Switching Power Supply and
The reliability of power device.
Specifically, based on the circuit diagram shown in Fig. 3, by the sampling resistor voltage V that obtains of samplingR2、VR3Predetermined with one
Threshold value (fixed voltage value Vref) compares.As shown in Figure 5：Work as VR2Value be more than Vref when, the Vo1's being exported by comparator
Level will overturn；Intelligent cell detects after level overturns, logical when next pulse width modulation cycle arrives
Cross controller to force to make the mode of operation of LLC resonant converter be switched to output current limiting pattern by constant voltage mode of operation, so make
LLC resonant converter do not need as in prior art due to by loop natural selection more than 10 pulse width modulation cycles
Could be completely into the mode of operation of output current limiting, thus improve the efficiency of switching current limliting.In the same manner, work as VR3Value be more than Vref
When, the level of the Vo1 being exported by comparator also can overturn, and will not be described here.
Present invention also offers a kind of preferably solve lock mode, so that will after the electric current of resonance circuit recovers normally
Drive solution block.In a preferred embodiment of the present invention, as shown in fig. 6, resonance circuit current-limiting protection device also includes：
Judging unit 602, for when the next harmonic period of current harmonic period arrives, judging whether the former limit of resonance circuit goes out
Existing excessively stream；Deblocking lock unit 604, when excessively stream for the former limit in described resonance circuit, drives solution block to described.
Present invention also offers a kind of mode preferably sampling resistor both end voltage sampled, to adopt exactly
Sample obtains required voltage, thus realizing whether electric current is exceeded with the judgement of threshold value.In a preferred embodiment of the present invention
In, detector unit 102, it is additionally operable to carry out unsteady flow by current transformer (CT) to described resonance current, by commutator to change
Described resonance current after stream carries out rectification；The two ends of the sampling resistor that the resonance current after rectification flows through carry out voltage sample
Obtain the voltage at sampling resistor two ends.
In a preferred embodiment of the present invention it is preferred that above-mentioned predetermined threshold including but not limited to down to
One of few：First predetermined threshold and the second predetermined threshold；Above-mentioned sampling resistor includes but is not limited at least one of：First
Sampling resistor and the second sampling resistor；Above-mentioned pipe is driven includes but is not limited at least one of：First pair drives to pipe
Drive to pipe with second, as shown in fig. 7, lockout module 202 includes：First block submodule 702, in the first sampling electricity
When the voltage at resistance two ends is more than the first predetermined threshold, block first drives to pipe；Second block submodule 704, for the
When the voltage at two sampling resistor two ends is more than the second predetermined threshold, block second drives to pipe.
Embodiment 2
Based on the device shown in 1-7 and circuit, present invention also offers a kind of preferred resonance circuit current limiting protecting method,
As shown in figure 8, the method specifically includes：
S802：The voltage at the sampling resistor two ends that resonance current flows through in detection resonance circuit；
S804：When voltage sampling resistor two ends is detected on current harmonic period is more than predetermined threshold, block resonance
The driving of circuit；
S806：When next pulse width modulation cycle arrives, resonance circuit is switched to output current limiting mould by constant voltage mode
Formula.
In above-mentioned preferred implementation, make LLC resonance after wave limiting is detected by adding in intelligent cell
Changer immediately enters the strategy of restrictor ring so that within primary current drops to threshold values rapidly on controlling, solve continuous by
The exceeded technical problem of the full-bridge tube voltage stress that causes during ripple current limliting, improves Switching Power Supply and the reliability of power device.
In a preferred embodiment of the invention, the step blocking the driving of described resonance circuit includes：Block and institute
State direction of resonant current corresponding a pair pipe to be driven.By detecting the sense of current of resonance current, when resonance current exceedes electricity
During stream protection threshold values, block a pair according to the sense of current detecting and pipe is driven to reach LLC resonance circuit wave limiting guarantor
Shield, solves asking of the time delay causing in prior art due to needing to block four drivings of full-bridge pipe in wave limiting
Topic, has reached to the technique effect realizing quick response by the loop after ripple.
Specifically, as shown in figure 3, resonance current to be changed into direct current through current transformer (CT) from high-frequency ac value effective
After value, pass through commutator and carry out rectification, sample finally by the voltage at sampling resistor two ends.Preferably, with Fig. 3
ILrThe sense of current is positive resonance current for just, then flowing through the electric current of sampling resistor R2, and the electric current flowing through sampling resistor R3 is
Negative sense resonance current, can be obtained by corresponding resonance current size by the voltage at R2 and R3 two ends of sampling, thus realizes
Detection to positive and negative resonance current.Preferably, work as VR2When exceeding predetermined threshold Vref, the driving of block V2 and V3；Work as VR3Super
When crossing predetermined threshold Vref, the driving of block V1 and V4, thus reached the purpose of wave limiting.
In a preferred embodiment of the invention, described resonance circuit is switched to output current limiting pattern by constant voltage mode
Step include：When the generation reversion of the output signal level of comparator of described resonance circuit is detected, by a upper resonance
The electric current loop error signal of the electric current loop output signal in cycle and a upper harmonic period resets；According to described current harmonic period
Electric current loop output signal come to produce for by described resonance circuit by constant voltage mode be switched to output current limiting pattern pulsewidth adjust
Signal processed.In the preferred embodiment, the method being switched to output current limiting pattern using pressure, improves logical in prior art
Cross loop natural selection to realize the conversion from constant voltage mode to current-limit mode, generally require more than 10 pulse width modulation cycles
Can be completely into the situation of the mode of operation of output current limiting it is achieved that when electric current exceedes predetermined threshold value, adjusting in next pulsewidth
Cycle processed just can make resonance circuit enter the effect of the mode of operation of output current limiting so that within primary current drops to threshold values rapidly,
Solve the exceeded technical problem of the full-bridge tube voltage stress causing during continuous wave limiting, improve Switching Power Supply and power device
The reliability of part.
Specifically, based on the circuit diagram shown in Fig. 3, by the sampling resistor voltage V that obtains of samplingR2、VR3Predetermined with one
Threshold value (fixed voltage value Vref) compares.As shown in Figure 5：Work as VR2Value be more than Vref when, the Vo1's being exported by comparator
Level will overturn；Intelligent cell detects after level overturns, logical when next pulse width modulation cycle arrives
Cross controller to force to make the mode of operation of LLC resonant converter be switched to output current limiting pattern by constant voltage mode of operation, so make
LLC resonant converter do not need as in prior art due to by loop natural selection more than 10 pulse width modulation cycles
Could be completely into the mode of operation of output current limiting, thus improve the efficiency of switching current limliting.In the same manner, work as VR3Value be more than Vref
When, the level of the Vo1 being exported by comparator also can overturn, and will not be described here.
In a preferred embodiment of the present invention, predetermined threshold includes：First predetermined threshold and the second predetermined threshold；
Described sampling resistor includes：First sampling resistor and the second sampling resistor；Described pipe is driven includes：First pair to pipe drive and
Second pair drives to pipe, and wherein, the step that block drives to pipe for corresponding with described direction of resonant current a pair includes：When described
When the voltage at the first sampling resistor two ends is more than the first predetermined threshold, block described first drives to pipe；When described second adopts
When the voltage at sample resistance two ends is more than the second predetermined threshold, block described second drives to pipe.
In a preferred embodiment of the present invention, after blocking the driving of described resonance circuit, resonance circuit limits
Stream guard method also includes：When the next harmonic period of described current harmonic period arrives, judge described resonance circuit
Whether former limit excessively stream；If excessively stream in the former limit of described resonance circuit, drive solution block to described.
In a preferred embodiment of the present invention, the voltage at the sampling resistor two ends that the described resonance current of detection flows through
Step include：Unsteady flow is carried out to described resonance current by current transformer；By commutator to the described resonance after unsteady flow
Electric current carries out rectification；The two ends of the described sampling resistor that the described resonance current after rectification flows through carry out voltage sample and obtain institute
State the voltage at sampling resistor two ends.
Embodiment 3
The invention provides a kind of preferred embodiment further the present invention to be explained, but noticeable
It is that the preferred embodiment is intended merely to preferably describe the present invention, does not constitute and the present invention is improperly limited.
Below by specific embodiment and combine accompanying drawing the present invention is described in further detail.
As shown in figure 3, a kind of LLC resonance circuit, including resonant inductance Lr, main transformer T, resonant capacitance Cr, main power
Switching device V1, V2, V3 and V4, secondary Power SBD D1 and D2.
Resonance electric current detection circuit includes：Current Transmit 1, the magnetic reset resistance R1 of CT1, diode D3, D4, D5 and
D6.Preferably, diode uses fast recovery diode or Schottky diode and current sampling resistor R2 and R3.Resonance electricity
Road is connected to DC input voitage Vin, and described primary power switch device V1, V2, V3 and V4 carry body diode, described LLC resonance
That the transformer secondary of circuit connects is output voltage Vo.
This LLC resonance circuit passes through to control the switching frequency of primary power switch device V1, V2, V3 and V4 can realize main work(
The no-voltage of rate device opens the zero-current switching (ZCS) of (ZVS) and secondary side diode, is so conducive to reducing power device
Switching loss, to improve the efficiency of whole machine.In order to overcurrent protection be made to the device in main topological circuit it is necessary to master
Electric current in topological circuit is detected.
As shown in Figure 3：The current sensing means of this LLC resonance circuit it is preferred that resonance current is ILr, the sense of current with
Direction shown in figure arrow is just, the turn ratio of CT1 is n, resonance current after CT1 conversion, I(I1-I2)=ILr/ n it is preferred that
Resonance current is changed into direct current virtual value from high-frequency ac value detected, makes detection convenient.Again with commutator to change
Resonance current after changing carries out rectification, and the electric current after rectification flows through sampling resistor, and the voltage at sampling resistor two ends is sampled
And then obtain flowing through the size of the resonance current of sampling resistor.By this preferred implementation, current sensing means can detect
Positive resonance current：VR2=(ILr/n)*R2.Reverse resonance current can also be detected：VR3=(ILr/n)*R3.Work as VR2Exceed and set
During definite value Vref, the driving of block V2 and V3；Work as VR3When exceeding setting value Vref, the driving of block V1 and V4.
Drive implementing as shown in Figure 5 of block.Work as VR2Or VR3After exceeding setting value Vref, respective drive enables
Unit enables pin level and can overturn, as shown in figure 9, at this moment corresponding PWM ripple can be blocked in this pulse width modulation cycle, block
Continue to next harmonic period at first；When next harmonic period arrives, judge whether that resonance circuit is
No former limit excessively stream, if former limit current limliting in resonance circuit, in a pair of drive to block for the next pulse width modulation cycle
The dynamic solution that carries out is blocked, and recovers normal operating conditions.
Preferably, comparator output signal Vo1, Vo2 is sent to the intelligent cell shown in Fig. 5 simultaneously.Intelligent cell is as schemed
Include shown in 10：Feedback voltage ring and feedback current ring.Wherein, feedback voltage ring and feedback current ring are concurrent workings, voltage
Ring plays pressure stabilization function, and electric current loop plays metering function.Voltage loop and electric current loop are all using the control method of PI (proportional, integral).Its
In, the expression formula that electric current loop PI controls is as follows：
Iout(k)=Iout(k-1)+Kp*err(k)+Ki*err(k-1)
Wherein, IoutK () is the output of this cycle electric current loop, Iout(k-1) be electric current loop of upper cycle output, err (k) is
This cycle electric current loop error, err (k-1) is a upper periodic current ring error.
Intelligent cell detects to the incoming level of Vo1 and Vo2, when intelligent cell detects comparator output signal
After the level of Vo1 or Vo2 overturns, intelligent cell is by the output I of electric current loop of upper cycleoutAnd a upper periodic current (k-1)
Ring error e rr (k-1) resets.At this moment, the output of electric current loop only has an error rate component, output valve very little.Due to loop
It is compared to exporting in feedback voltage ring and feedback current ring, select less one and exported, so this when is humorous
The circuit that shakes can be operated in current-limit mode, and because the output component very little of feedback current ring is it is possible to just output current
Limit in a less value, the energy also very little that therefore LLC resonant converter provides to outside, the former limit of resonant transform circuit
Electric current also can be decayed rapidly, plays the protective effect to resonance circuit.Further, since electric current loop has the cumulative effect of integration,
So the output of electric current loop can be gradually increased, finally reach a stable cut-off current.In the preferred embodiment, by with
Upper step, the exceeded problem of the full-bridge tube voltage stress being caused due to continuous wave limiting is substantially achieved solution.Preferably, entirely
Bridge tube voltage stress is less than the rated voltage of switching tube.
As can be seen from the above description, traditional LLC full-bridge resonance electric current detection circuit typically can only detect resonance
The size of electric current, and sense of current can not be judged so that needing in wave limiting to close the drive of four switching tubes of full-bridge pipe
Dynamic.Additionally, conventionally, as the special topological structure of LLC full-bridge is so that full-bridge tube voltage should after continuous wave limiting
Power has the phenomenon of severe overweight, and switching tube so can be led to damage because of voltage stress.With the inspection of traditional LLC full-bridge resonance current
Slowdown monitoring circuit is compared, and the present invention can realize the detection of the positive and negative resonance current of LLC full-bridge, thus only needing to close full-bridge when by ripple
The driving to pipe for the pipe.In addition present invention addresses the full-bridge tube voltage stress severe overweight that causes for continuous wave limiting
Problem, greatly improves the reliability of full-bridge pipe.
Obviously, those skilled in the art should be understood that each module of the above-mentioned present invention or each step can be with general
Computing device realizing, they can concentrate on single computing device, or be distributed in multiple computing devices and formed
Network on, alternatively, they can be realized with the executable program code of computing device, it is thus possible to they are stored
To be executed by computing device in the storage device, and in some cases, can be with different from shown in order execution herein
The step going out or describing, or they are fabricated to respectively each integrated circuit modules, or by the multiple modules in them or
Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (11)
1. a kind of resonance circuit current limiting protecting method is it is characterised in that include：
The voltage at the sampling resistor two ends that resonance current flows through in detection resonance circuit；
When the voltage described sampling resistor two ends is detected on current harmonic period is more than predetermined threshold, block described resonance electricity
The driving on road；
When next pulse width modulation cycle arrives, described resonance circuit is switched to output current limiting pattern by constant voltage mode.
2. method according to claim 1 is it is characterised in that be switched to output limit by described resonance circuit by constant voltage mode
The step of stream mode includes：
When the generation reversion of the output signal level of comparator of described resonance circuit is detected, by the electricity of a upper harmonic period
The electric current loop error signal of stream ring output signal and a upper harmonic period resets；
Produced for being cut described resonance circuit by constant voltage mode according to the electric current loop output signal of described current harmonic period
Change to the pulse-width signal of output current limiting pattern.
3. method according to claim 1 is it is characterised in that the step blocking the driving of described resonance circuit includes：
Block drives to pipe for corresponding with described direction of resonant current a pair.
4. method according to claim 3 is it is characterised in that described predetermined threshold includes：First predetermined threshold and second
Predetermined threshold；Described sampling resistor includes：First sampling resistor and the second sampling resistor；Described pipe is driven includes：First pair
Pipe driving and second are driven to pipe, wherein, the step that block drives to pipe for corresponding with described direction of resonant current a pair
Including：
When the voltage at described first sampling resistor two ends is more than the first predetermined threshold, block described first drives to pipe；
When the voltage at described second sampling resistor two ends is more than the second predetermined threshold, block described second drives to pipe.
5. method according to claim 1 is it is characterised in that after blocking the driving of described resonance circuit, also include：
When the next harmonic period of described current harmonic period arrives, judge whether the former limit of described resonance circuit occurred
Stream；
If excessively stream in the former limit of described resonance circuit, drive solution block to described.
6. method according to any one of claim 1 to 5 is it is characterised in that detect adopting of flowing through of described resonance current
The step of the voltage at sample resistance two ends includes：
Unsteady flow is carried out to described resonance current by current transformer；
Rectification is carried out to the described resonance current after unsteady flow by commutator；
The two ends of the described sampling resistor that the described resonance current after rectification flows through carry out voltage sample and obtain described sampling electricity
The voltage at resistance two ends.
7. a kind of resonance circuit current-limiting protection device is it is characterised in that include：
Detector unit, for detecting the voltage at sampling resistor two ends that in resonance circuit, resonance current flows through；
Block unit, when the voltage for described sampling resistor two ends is detected on current harmonic period is more than predetermined threshold,
Block the driving of described resonance circuit；
Switch unit, for when next pulse width modulation cycle arrives, described resonance circuit being switched to defeated by constant voltage mode
Go out current-limit mode.
8. device according to claim 7 is it is characterised in that described switch unit includes：
Dump block, for when the generation reversion of the output signal level of comparator of described resonance circuit is detected, by upper one
The electric current loop error signal of the electric current loop output signal of individual harmonic period and a upper harmonic period resets；
Generation module, for producing for by described resonance circuit according to the electric current loop output signal of described current harmonic period
It is switched to the pulse-width signal of output current limiting pattern by constant voltage mode.
9. device according to claim 7 is it is characterised in that described block unit includes：
Lockout module, when the voltage for described sampling resistor two ends is detected on current harmonic period is more than predetermined threshold,
Block drives to pipe for corresponding with described direction of resonant current a pair.
10. device according to claim 9 is it is characterised in that described predetermined threshold includes：First predetermined threshold and second
Predetermined threshold；Described sampling resistor includes：First sampling resistor and the second sampling resistor；Described pipe is driven includes：First pair
Pipe driving and second are driven to pipe, wherein, described lockout module includes：
First block submodule, when being more than the first predetermined threshold for the voltage at described first sampling resistor two ends, blocks institute
State first to drive to pipe；
Second block submodule, when being more than the second predetermined threshold for the voltage at described second sampling resistor two ends, blocks institute
State second to drive to pipe.
11. devices according to any one of claim 7-10 are it is characterised in that also include：
Judging unit, for when the next harmonic period of described current harmonic period arrives, judging described resonance circuit
Whether former limit excessively stream；
Deblocking lock unit, when excessively stream for the former limit in described resonance circuit, drives solution block to described.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110394777.7A CN103138590B (en) | 2011-12-02 | 2011-12-02 | Current-limiting protection method and device of resonance circuit |
| PCT/CN2012/077449 WO2013078851A1 (en) | 2011-12-02 | 2012-06-25 | Current-limiting protection method and device for resonance circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110394777.7A CN103138590B (en) | 2011-12-02 | 2011-12-02 | Current-limiting protection method and device of resonance circuit |
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| CN103138590B true CN103138590B (en) | 2017-02-08 |
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| CN103546048B (en) * | 2013-10-30 | 2018-03-06 | 华为技术有限公司 | Current sample method |
| US9203318B2 (en) * | 2013-12-18 | 2015-12-01 | Texas Instruments Deutschland Gmbh | Primary side current regulation on LLC converters for LED driving |
| CN103856062B (en) * | 2014-02-26 | 2017-07-28 | 联合汽车电子有限公司 | The dual-loop control circuit of phase-shifting full-bridge circuit of synchronous rectification |
| CN104638895B (en) * | 2015-02-02 | 2017-02-01 | 华中科技大学 | Current-limiting method and current-limiting circuit of LLC resonant converter |
| CN106059274A (en) * | 2016-07-15 | 2016-10-26 | 东莞市米町源电子科技有限公司 | Resonant control circuit |
| FR3064829B1 (en) * | 2017-04-03 | 2019-04-05 | Valeo Siemens Eautomotive France Sas | METHOD OF PROTECTING AGAINST AN OVERPOWER CURRENT IN A RESONANT CIRCUIT |
| CN110416974B (en) * | 2019-08-15 | 2021-12-10 | 阳光电源股份有限公司 | Switching power supply protection circuit, switching power supply and switching power supply protection method |
| CN110896211B (en) * | 2019-11-29 | 2022-05-24 | 深圳市科华恒盛科技有限公司 | Resonant circuit abnormality control circuit, control method and resonant device |
| CN112713796B (en) * | 2020-12-18 | 2022-05-17 | 国创移动能源创新中心(江苏)有限公司 | DC/AC control method and device of bidirectional direct current charger in off-grid mode |
| WO2022174429A1 (en) * | 2021-02-20 | 2022-08-25 | 华为技术有限公司 | Llc converter, control circuit, soft start method and apparatus, and chip |
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| WO2013078851A1 (en) | 2013-06-06 |
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