CN107370356A - The startup current-limiting circuit of direct current supply switching power converters - Google Patents
The startup current-limiting circuit of direct current supply switching power converters Download PDFInfo
- Publication number
- CN107370356A CN107370356A CN201710805043.0A CN201710805043A CN107370356A CN 107370356 A CN107370356 A CN 107370356A CN 201710805043 A CN201710805043 A CN 201710805043A CN 107370356 A CN107370356 A CN 107370356A
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- current
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to a kind of startup current-limiting circuit of direct current supply switching power converters, current limiting unit is serially connected between input DC power positive pole and bus capacitor C0 positive poles, current limiting unit is by the first FET V1, first resistor R1, second resistance R2 and the first electric capacity C1 is formed, second resistance R2 is connected to the first FET V1 base stage, and first resistor R1 and the first electric capacity C1 are in parallel, are connected between the first FET V1 base stage and source electrode.Input current feedback signal is obtained by input current sample circuit, delivers to current-limiting control circuit, current-limiting control circuit adjusts the first FET V1 drive level according to feedback signal, then adjusts the first FET V1 conducting resistance to suppress dash current.The present invention can automatically adjust FET conducting resistance to limit dash current, save soft start resistance and contactor under usual manner, have the advantages of simple in construction, small volume, control strategy is simple, and reliability is high.
Description
Technical field
The present invention relates to a kind of Power Electronic Technique, the startup limit of more particularly to a kind of direct current supply switching power converters
Current circuit.
Background technology
In order to ensure the stationarity of Switching Power Supply input direct current supply, generally in one great Rong of Switching Power Supply input parallel connection
The electrochemical capacitor of amount filters out low-frequency noise.When Switching Power Supply starts, the electrochemical capacitor is started from scratch charging, will be produced larger
Dash current, coordinate power resistor to carry out soft start, power resistor limitation impact electricity using contactor under conventional current limliting scheme
Stream, is bypassed power resistor by contactor after the completion of to be launched, conventional scheme need to add extra control logic, and power
Resistance and contactor volume are big, are unfavorable for improving inverter power density.
The content of the invention
A kind of the problem of existing the present invention be directed to conventional soft start-up scheme, it is proposed that direct current supply switching power converters
Startup current-limiting circuit, to suppress Switching Power Supply inrush current and improved soft start-up scheme.
The technical scheme is that：A kind of startup current-limiting circuit of direct current supply switching power converters, including current limliting
Circuit, input current sample circuit and current-limiting control circuit；Bus capacitor C0It is connected in parallel on inverter input both ends, current-limiting circuit string
It is connected to input DC power positive pole and bus capacitor C0Between positive pole, the input electricity of input current sample circuit collection inverter
Stream, i.e., current-limiting circuit output current, the input current of inverter deliver to current-limiting control circuit as feedback signal；
Current-limiting circuit is made up of the first FET V1, first resistor R1, second resistance R2 and the first electric capacity C1, second resistance R2
The first FET V1 base stage is connected to, first resistor R1 and the first electric capacity C1 are in parallel, are connected to the first FET V1 base stage
Between source electrode；
Current-limiting control circuit adjusts the drive level signal of the first FET V1 in current-limiting circuit according to feedback signal.
The current-limiting control circuit includes PI regulation circuits, relay protective scheme circuit and isolating amplifier circuit；Input current is adopted
The input current and current limliting reference value signal of sample circuit collection inverterI ref It is input to PI regulation circuits, startup/shutdown/protection
Signal send the clamp signal feeding of relay protective scheme circuit, PI regulation circuit output regulation voltage signals and relay protective scheme circuit output
Isolating amplifier circuit, the first FET V1 control terminals that isolating amplifier circuit is output signals in current-limiting circuit.
The PI regulations circuit includes the first operational amplifier N1, the second operational amplifier N2,3rd resistor R3, the 4th electricity
Hinder the electric capacity of R4, the 5th resistance R5, the 6th resistance R6, the tenth resistance R10, second C2, the first voltage-stabiliser tube D1 and the second voltage-stabiliser tube D2；
3rd resistor R3 mono- terminates the input current as feedback signal, the first operational amplifier N1 of another termination anti-phase input
End；4th resistance R4 mono- terminates current limliting reference value signalI ref , the first operational amplifier N1 of another termination reverse input end；The
One operational amplifier N1 homophase input termination control reference ground；Computing is connected across after 5th resistance R5 and the second electric capacity C2 series connection
Between amplifier N1 inverting input and output end；First voltage-stabiliser tube D1 anodes connect operational amplifier N1 output ends, and first is steady
Pressure pipe D1 negative electrodes are connected with the second voltage-stabiliser tube D2 negative electrodes, and the second voltage-stabiliser tube D2 anodes connect operational amplifier N1 inverting input；
First operational amplifier N1 output end connects the second operational amplifier N2 in-phase input end by the 6th resistance R6；Second computing
Amplifier N2 inverting input is connected with output end, the second operational amplifier N2 output ends by the tenth resistance R10 be connected to every
From the input of the isolation operational amplifier N3 in amplifying circuit 113.
The relay protective scheme circuit include the second FET V2, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9 and
3rd diode D3；
Startup/shutdown/protection signal is connected to the second FET V2 base stage by the 7th resistance R7；8th resistance R8 is connected to
Between two FET V2 base stage and source electrode；Second FET V2 source electrode meets negative supply VEE；9th resistance R9 mono- is terminated
Second FET V2 drain electrode, the 3rd diode D3 of another termination negative electrode；3rd diode D3 anode is connected to isolation and put
The input of isolation operational amplifier N3 in big circuit.
The isolating amplifier circuit includes isolation operational amplifier N3, four-operational amplifier N4, the 5th operational amplifier
N5, the 11st resistance R11 and the 12nd resistance R12；
Isolation operational amplifier N3 primary side reference grounds connect control ground, connect to secondary side reference insulated gate bipolar transistor npn npn V1 source
Pole；11st resistance R11 mono- termination isolation operational amplifiers N3 output end, another termination four-operational amplifier N4 same phase
Input, the 12nd resistance R12 mono- termination isolation operational amplifiers N3 output end, the 5th operational amplifier N5's of another termination
In-phase input end；Four-operational amplifier N4 and the 5th respective inverting inputs of operational amplifier N5 all with its respective output
End is connected, and both output end connections are followed by into current-limiting circuit insulated gate bipolar transistor npn npn V1 gate pole.
The beneficial effects of the present invention are：The startup current-limiting circuit of direct current supply switching power converters of the present invention, can be certainly
It is dynamic to adjust FET conducting resistance to limit dash current, soft start resistance and contactor under usual manner are saved, is compared
The advantages of conventional soft start scheme has simple in construction, small volume, and reliability is high.
Brief description of the drawings
Fig. 1 is the startup current-limiting circuit block diagram of direct current supply switching power converters of the present invention；
Fig. 2 is current-limiting control circuit schematic diagram of the present invention；
Fig. 3 is current limliting experimental waveform figure of the present invention.
Embodiment
The startup current-limiting circuit block diagram of direct current supply switching power converters as shown in Figure 1, the soft circuit that opens include current limliting electricity
Road 101, input current sample circuit and current-limiting control circuit 102.Bus capacitor C0It is connected in parallel on inverter input both ends, current limliting electricity
Road 101 is serially connected with input DC power positive pole and bus capacitor C0Between positive pole, input current sample circuit collection inverter
Input current, the i.e. output current of current-limiting circuit 101, using the input current of inverter as feedback signal, deliver to Current limited Control electricity
Road 102；Current limiting unit 101 is made up of the first FET V1, first resistor R1, second resistance R2 and the first electric capacity C1, and second
Resistance R2 is connected to the first FET V1 base stage, and first resistor R1 and the first electric capacity C1 are in parallel, are connected to the first FET V1
Base stage and source electrode between.Current-limiting control circuit 102 adjusts the first FET V1's in current-limiting circuit 101 according to feedback signal
Drive level signal, the output signal of current-limiting control circuit 102 is by second resistance R2 to the first FET V1 control terminals, and second
Resistance R2 is driving resistance, to prevent that it is too fast that driving from rising, generally takes 3 Europe or so.
Current-limiting control circuit schematic diagram as shown in Figure 2, current-limiting control circuit include PI regulation circuits 111, relay protective scheme electricity
Road 112 and isolating amplifier circuit 113.
PI regulation circuits 111 include the first operational amplifier N1, the second operational amplifier N2,3rd resistor R3, the 4th electricity
Hinder the electric capacity of R4, the 5th resistance R5, the 6th resistance R6, the tenth resistance R10, second C2, the first voltage-stabiliser tube D1 and the second voltage-stabiliser tube D2.
3rd resistor R3 mono- terminates the input current as feedback signal, the first operational amplifier N1 of another termination inverting input；
4th resistance R4 mono- terminates current limliting reference value signalI ref , the first operational amplifier N1 of another termination reverse input end；First fortune
Calculate amplifier N1 homophase input termination control reference ground；Operation amplifier is connected across after 5th resistance R5 and the second electric capacity C2 series connection
Between device N1 inverting input and output end；First voltage-stabiliser tube D1 anodes connect operational amplifier N1 output ends, the first voltage-stabiliser tube
D1 negative electrodes are connected with the second voltage-stabiliser tube D2 negative electrodes, and the second voltage-stabiliser tube D2 anodes connect operational amplifier N1 inverting input；First
Operational amplifier N1 output end connects the second operational amplifier N2 in-phase input end by the 6th resistance R6；Second operation amplifier
Device N2 inverting input is connected with output end, and the second operational amplifier N2 output ends are connected to isolation by the tenth resistance R10 and put
The input of isolation operational amplifier N3 in big circuit 113.
Relay protective scheme circuit 112 include the second FET V2, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9 and
3rd diode D3.
Startup/shutdown/protection signal is connected to the second FET V2 base stage by the 7th resistance R7；8th resistance R8 connects
Between the second FET V2 base stage and source electrode；Second FET V2 source electrode meets negative supply VEE；9th resistance R9 mono-
Terminate the second FET V2 drain electrode, the 3rd diode D3 of another termination negative electrode；3rd diode D3 anode be connected to every
From the input of the isolation operational amplifier N3 in amplifying circuit 113.
Isolating amplifier circuit 113 include isolation operational amplifier N3 (the 3rd operational amplifier), four-operational amplifier N4,
5th operational amplifier N5, the 11st resistance R11 and the 12nd resistance R12.Isolation operational amplifier N3 primary side reference grounds connect control
System ground, connect to secondary side reference insulated gate bipolar transistor npn npn V1 source electrode；11st resistance R11 mono- termination isolation operation amplifiers
Device N3 output end, another termination four-operational amplifier N4 in-phase input end, the 12nd resistance R12 mono- termination isolation computings
Amplifier N3 output end, the 5th operational amplifier N5 of another termination in-phase input end；Four-operational amplifier N4 and the 5th
The respective inverting inputs of operational amplifier N5 are all connected with its respective output end, and both output end connections are followed by current limliting
Insulated gate bipolar transistor npn npn V1 gate pole in circuit 101.
The present invention suppresses dash current using FET V1 itself variable resistor zone properties.FET can power transformation
Resistance zone properties are described as, when reach FET to driving voltage and open threshold voltage and not up to voltage needed for saturation conduction
During value, the conducting resistance of FET changes with driving voltage value approximately linear, therefore present invention basis flows through FET
Electric current carrys out closed-loop control FET V1 driving voltage amplitude, so as to adjust FET V1 conducting resistance, and then suppresses
FET V1 dash current is flowed through, after bus capacitor C0 charges, FET V1 driving voltage amplitudes are adjusted automatically
Save to maximum, FET V1 saturation conductions.
In order to provide FET V1 saturation conduction voltage, all operational amplifiers in the Current limited Control electric current 102
Powered using positive and negative 15V.
In the PI regulations circuit 111, the first operational amplifier N1, the 5th resistance R5 and the second electric capacity C2 forms PI regulations
Device, N1 automatically adjust output voltage, the first voltage-stabiliser tube D1 and the second voltage-stabiliser tube D2 according to feedback current and driving voltage are carried out
Amplitude limit, the first voltage-stabiliser tube D1 voltage stabilizings value are 15V, and the second voltage-stabiliser tube D2 voltage stabilizings value is 5V, the second operational amplifier N2 starting voltage with
Acted on device.
In isolating amplifier circuit 113, the 3rd operational amplifier N3 plays buffer action, the fortune of four-operational amplifier N4 and the 5th
The effect of amplifier N5 starting voltage follower is calculated, while improves load capacity, strengthens driving force.
In relay protective scheme circuit 112, start-up command is that low level is effective, by controlling the second FET V2 and the three or two
The negative voltage of the 3rd operational amplifier N3 input voltages is clamped when pole pipe D3 break-make is to realize shutdown or protection.Second effect
Should pipe V2 source electrodes meet VEEFor -15V, therefore no matter why the second operational amplifier N2 output voltages are worth, once V2 conductings are inevitable
It can turn on the 3rd diode D3, by the 3rd operational amplifier N3 inputs clamp to negative pressure value.
The specific implementation flow of the present invention is provided with reference to Figure of description.
Input current sampled value is zero before start, and the first operational amplifier N1 bears saturation and exported to -5V, the second operation amplifier
Device N2 equally exports -5V.Now the 7th resistance R7 connects high level, and the second FET V2 is open-minded, and isolation operational amplifier N3 is defeated
Enter end clamp and follow output negative pressure value to negative pressure value, four-operational amplifier N4 and the 5th operational amplifier N5, first is imitated
Should pipe V1 shut-offs.
When receiving start-up command, the second FET V2 shut-offs, the 3rd diode D3 cut-offs, relay protective scheme circuit 112 is not
Work.
After receiving start-up command, pi regulator is started working, and the first operational amplifier N1 exits rapidly saturation, according to electric current
Sampling feedback value and current limliting set-point Iref difference adjust rapidly output voltage, when current sample value of feedback and current limliting set-point
When equal, the first operational amplifier N1 maintains that a fixed value is constant, i.e. the driving voltage of the first FET V1 remains one solid
Definite value is constant, and bus capacitor C0 is with cut-off current constant-current charge.
During normal work, bus capacitor C0 has been filled with electricity, and current sample value of feedback is less than current limliting set-point Iref, the first fortune
Calculate amplifier N1 and enter positive saturation state, output+15V voltages, by the first FET V1 saturation conductions.
When generation is protected or receives shutdown command, the second FET V2 and the 3rd diode D3 conductings, the first field-effect
Pipe V1 driving voltage is clamped to negative voltage, and V1 is turned off.
Current limliting experimental waveform figure as shown in Figure 3, the current-limited waveform in start-up course, dash current can be effectively suppressed.
Claims (5)
1. a kind of startup current-limiting circuit of direct current supply switching power converters, it is characterised in that including current-limiting circuit, input electricity
Flow sample circuit and current-limiting control circuit；Bus capacitor C0Inverter input both ends are connected in parallel on, it is straight that current-limiting circuit is serially connected with input
Flow positive source and bus capacitor C0Between positive pole, input current sample circuit gathers the input current of inverter, i.e. current limliting electricity
Road output current, the input current of inverter deliver to current-limiting control circuit as feedback signal；
Current-limiting circuit is made up of the first FET V1, first resistor R1, second resistance R2 and the first electric capacity C1, second resistance R2
The first FET V1 base stage is connected to, first resistor R1 and the first electric capacity C1 are in parallel, are connected to the first FET V1 base stage
Between source electrode；
Current-limiting control circuit adjusts the drive level signal of the first FET V1 in current-limiting circuit according to feedback signal.
2. the startup current-limiting circuit of direct current supply switching power converters according to claim 1, it is characterised in that the limit
Flow control circuit includes PI regulation circuits, relay protective scheme circuit and isolating amplifier circuit；Input current sample circuit gathers inversion
The input current of device and current limliting reference value signalI ref PI regulation circuits are input to, startup/shutdown/protection signal send relay protective scheme
The clamp signal of circuit, PI regulation circuit output regulation voltage signals and relay protective scheme circuit output is sent into isolating amplifier circuit,
The first FET V1 control terminals that isolating amplifier circuit is output signals in current-limiting circuit.
3. the startup current-limiting circuit of direct current supply switching power converters according to claim 2, it is characterised in that the PI
Adjust circuit and include the first operational amplifier N1, the second operational amplifier N2,3rd resistor R3, the 4th resistance R4, the 5th resistance
R5, the 6th resistance R6, the tenth resistance R10, the second electric capacity C2, the first voltage-stabiliser tube D1 and the second voltage-stabiliser tube D2；
3rd resistor R3 mono- terminates the input current as feedback signal, the first operational amplifier N1 of another termination anti-phase input
End；4th resistance R4 mono- terminates current limliting reference value signalI ref , the first operational amplifier N1 of another termination reverse input end；The
One operational amplifier N1 homophase input termination control reference ground；Computing is connected across after 5th resistance R5 and the second electric capacity C2 series connection
Between amplifier N1 inverting input and output end；First voltage-stabiliser tube D1 anodes connect operational amplifier N1 output ends, and first is steady
Pressure pipe D1 negative electrodes are connected with the second voltage-stabiliser tube D2 negative electrodes, and the second voltage-stabiliser tube D2 anodes connect operational amplifier N1 inverting input；
First operational amplifier N1 output end connects the second operational amplifier N2 in-phase input end by the 6th resistance R6；Second computing
Amplifier N2 inverting input is connected with output end, the second operational amplifier N2 output ends by the tenth resistance R10 be connected to every
From the input of the isolation operational amplifier N3 in amplifying circuit 113.
4. the startup current-limiting circuit of direct current supply switching power converters according to Claims 2 or 3, it is characterised in that institute
State relay protective scheme circuit and include the second FET V2, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9 and the 3rd diode
D3；
Startup/shutdown/protection signal is connected to the second FET V2 base stage by the 7th resistance R7；8th resistance R8 is connected to
Between two FET V2 base stage and source electrode；Second FET V2 source electrode meets negative supply VEE；9th resistance R9 mono- is terminated
Second FET V2 drain electrode, the 3rd diode D3 of another termination negative electrode；3rd diode D3 anode is connected to isolation and put
The input of isolation operational amplifier N3 in big circuit.
5. the startup current-limiting circuit of direct current supply switching power converters according to claim 4, it is characterised in that it is described every
Isolation operational amplifier N3, four-operational amplifier N4, the 5th operational amplifier N5, the 11st resistance are included from amplifying circuit
R11 and the 12nd resistance R12；
Isolation operational amplifier N3 primary side reference grounds connect control ground, connect to secondary side reference insulated gate bipolar transistor npn npn V1 source
Pole；11st resistance R11 mono- termination isolation operational amplifiers N3 output end, another termination four-operational amplifier N4 same phase
Input, the 12nd resistance R12 mono- termination isolation operational amplifiers N3 output end, the 5th operational amplifier N5's of another termination
In-phase input end；Four-operational amplifier N4 and the 5th respective inverting inputs of operational amplifier N5 all with its respective output
End is connected, and both output end connections are followed by into current-limiting circuit insulated gate bipolar transistor npn npn V1 gate pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710805043.0A CN107370356B (en) | 2017-09-08 | 2017-09-08 | Start current limiting circuit of DC power supply switching power supply converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710805043.0A CN107370356B (en) | 2017-09-08 | 2017-09-08 | Start current limiting circuit of DC power supply switching power supply converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107370356A true CN107370356A (en) | 2017-11-21 |
| CN107370356B CN107370356B (en) | 2023-08-18 |
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ID=60311505
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710805043.0A Active CN107370356B (en) | 2017-09-08 | 2017-09-08 | Start current limiting circuit of DC power supply switching power supply converter |
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| CN (1) | CN107370356B (en) |
Cited By (4)
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| CN108110822A (en) * | 2017-11-27 | 2018-06-01 | 中国北方车辆研究所 | High voltage direct current staged constant current closed loop pre-charge circuit |
| CN114270647A (en) * | 2019-09-05 | 2022-04-01 | 斯堪尼亚商用车有限公司 | Electronic circuit breaker for vehicle and method thereof |
| WO2022110608A1 (en) * | 2020-11-30 | 2022-06-02 | 江苏科技大学 | Direct current high-power power supply soft start circuit and method |
| CN116054552A (en) * | 2023-01-28 | 2023-05-02 | 苏州明纬科技有限公司 | Slow start control circuit for electronic circuit breaker and control method thereof |
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| CN114270647A (en) * | 2019-09-05 | 2022-04-01 | 斯堪尼亚商用车有限公司 | Electronic circuit breaker for vehicle and method thereof |
| WO2022110608A1 (en) * | 2020-11-30 | 2022-06-02 | 江苏科技大学 | Direct current high-power power supply soft start circuit and method |
| CN116054552A (en) * | 2023-01-28 | 2023-05-02 | 苏州明纬科技有限公司 | Slow start control circuit for electronic circuit breaker and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107370356B (en) | 2023-08-18 |
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