CN207382184U - 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
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- CN207382184U CN207382184U CN201721147986.0U CN201721147986U CN207382184U CN 207382184 U CN207382184 U CN 207382184U CN 201721147986 U CN201721147986 U CN 201721147986U CN 207382184 U CN207382184 U CN 207382184U
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Abstract
The utility model is related to a kind of startup current-limiting circuits of direct current supply switching power converters, current limiting unit is serially connected between input DC power anode and bus capacitor C0 anodes, current limiting unit is by the first field-effect tube V1, first resistor R1, second resistance R2 and the first capacitance C1 is formed, second resistance R2 is connected to the base stage of the first field-effect tube V1, and first resistor R1 and the first capacitance C1 are in parallel, are connected between base stage and the source electrode of the first field-effect tube V1.Input current feedback signal is obtained by input current sample circuit, is sent to current-limiting control circuit, current-limiting control circuit adjusts the drive level of the first field-effect tube V1 according to feedback signal, then adjusts the conducting resistance of the first field-effect tube V1 to inhibit dash current.The utility model can automatically adjust field-effect tube conducting resistance to limit dash current, save soft start resistance and contactor under usual manner, have simple in structure, small, the advantages of control strategy is simple, and reliability is high.
Description
Technical field
The utility model is related to a kind of Power Electronic Technique, a kind of more particularly to direct current supply switching power converters open
Dynamic current-limiting circuit.
Background technology
In order to ensure the stationarity of Switching Power Supply input terminal direct current supply, usually in one great Rong of Switching Power Supply input terminal parallel connection
The electrolytic capacitor of amount filters out low-frequency noise.When Switching Power Supply starts, which starts from scratch charging, will generate larger
Dash current, soft start, power resistor limitation impact electricity are carried out using contactor cooperation power resistor under conventional current limliting scheme
Stream is bypassed power resistor by contactor after the completion of to be launched, and conventional scheme need to add in additional control logic, and power
Resistance and contactor volume are big, are unfavorable for improving inverter power density.
The content of the invention
The utility model be for conventional soft start-up scheme there are the problem of, it is proposed that a kind of direct current supply Switching Power Supply becomes
The startup current-limiting circuit of parallel operation, the improved soft start-up scheme for inhibition Switching Power Supply inrush current.
The technical solution of the utility model is：A kind of startup current-limiting circuit of direct current supply switching power converters, including
Current-limiting circuit, input current sample circuit and current-limiting control circuit；Bus capacitor C0It is connected in parallel on inverter input both ends, current limliting electricity
Road is serially connected with input DC power anode and bus capacitor C0Between anode, input current sample circuit gathers the input of inverter
Electric current, i.e. current-limiting circuit output current, the input current of inverter are sent as feedback signal to current-limiting control circuit；
Current-limiting circuit is made of the first field-effect tube V1, first resistor R1, second resistance R2 and the first capacitance C1, the second electricity
Resistance R2 is connected to the base stage of the first field-effect tube V1, and first resistor R1 and the first capacitance C1 are in parallel, are connected to the first field-effect tube V1's
Between base stage and source electrode；
Current-limiting control circuit exports the drive level signal of the first field-effect tube V1.
The current-limiting control circuit includes PI and adjusts circuit, relay protective scheme circuit and isolating amplifier circuit；Input current is adopted
The input current and current limliting reference value signal of sample circuit acquisition inverterI ref It is input to PI and adjusts circuit, startup/shutdown/protection
Signal send relay protective scheme circuit, and PI adjusts the clamp signal feeding that circuit output adjusts voltage signal and relay protective scheme circuit output
Isolating amplifier circuit, isolating amplifier circuit output signals to the first field-effect tube V1 control terminals in current-limiting circuit.
The PI adjusts circuit and includes the first operational amplifier N1, second operational amplifier N2,3rd resistor R3, the 4th electricity
Hinder the capacitance 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 reverse phase of the first operational amplifier N1 of another termination
Input terminal；4th resistance R4 mono- terminates current limliting reference value signalI ref , the reversed input of the first operational amplifier N1 of another termination
End；The homophase input termination control reference ground of first operational amplifier N1；It is bridged after 5th resistance R5 and the second capacitance C2 series connection
Between the inverting input and output terminal of operational amplifier N1；First voltage-stabiliser tube D1 anodes connect operational amplifier N1 output terminals,
First voltage-stabiliser tube D1 cathodes are connected with the second voltage-stabiliser tube D2 cathodes, and the reverse phase that the second voltage-stabiliser tube D2 anodes meet operational amplifier N1 is defeated
Enter end；The output terminal of first operational amplifier N1 connects the in-phase input end of second operational amplifier N2 by the 6th resistance R6；The
The inverting input of two operational amplifier N2 is connected with output terminal, and second operational amplifier N2 output terminals pass through the tenth resistance R10
It is connected to the input terminal of the isolation operational amplifier N3 in isolating amplifier circuit 113.
The relay protective scheme circuit include the second field-effect tube 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 base stage of the second field-effect tube V2 by the 7th resistance R7；8th resistance R8 connects
Between the base stage of the second field-effect tube V2 and source electrode；The source electrode of second field-effect tube V2 meets negative supply VEE；9th resistance R9 mono-
Terminate the drain electrode of the second field-effect tube V2, the cathode of the 3rd diode D3 of another termination；The anode of 3rd diode D3 be connected to every
Input terminal from the isolation operational amplifier N3 in amplifying 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, meet to secondary side reference insulated gate bipolar transistor npn npn V1
Source electrode；The output terminal of 11st resistance R11 mono- termination isolation operational amplifiers N3, another termination four-operational amplifier N4's
In-phase input end, the output terminal of the 12nd resistance R12 mono- termination isolation operational amplifiers N3, the 5th operational amplifier of another termination
The in-phase input end of N5；Four-operational amplifier N4 and the 5th respective inverting inputs of operational amplifier N5 are all respective with it
Output terminal is connected, and the output terminal connection of the two is followed by into current-limiting circuit the gate pole of insulated gate bipolar transistor npn npn V1.
The beneficial effects of the utility model are：The startup current limliting electricity of the utility model direct current supply switching power converters
Road can automatically adjust field-effect tube conducting resistance to limit dash current, save soft start resistance and contact under usual manner
Device has simple in structure, small, the advantages of reliability is high compared to conventional soft start-up scheme.
Description of the drawings
Fig. 1 is the startup current-limiting circuit block diagram of the utility model direct current supply switching power converters；
Fig. 2 is the utility model current-limiting control circuit schematic diagram；
Fig. 3 is the utility model current limliting experimental waveform figure.
Specific 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 anode and bus capacitor C0Between anode, input current sample circuit acquisition inverter
Input current, i.e. 101 output current of current-limiting circuit using the input current of inverter as feedback signal, are sent to Current limited Control electricity
Road 102；Current limiting unit 101 is made of the first field-effect tube V1, first resistor R1, second resistance R2 and the first capacitance C1, and second
Resistance R2 is connected to the base stage of the first field-effect tube V1, and first resistor R1 and the first capacitance C1 are in parallel, are connected to the first field-effect tube V1
Base stage and source electrode between.Current-limiting control circuit 102 adjusts the first field-effect tube V1's in current-limiting circuit 101 according to feedback signal
Drive level signal.Current-limiting control circuit 102 exports signal by second resistance R2 to the first field-effect tube V1 control terminals, and second
Resistance R2 is driving resistance, to prevent that it is too fast that driving from rising, usually takes 3 Europe or so.
Current-limiting control circuit schematic diagram as shown in Figure 2, current-limiting control circuit include PI and adjust circuit 111, relay protective scheme electricity
Road 112 and isolating amplifier circuit 113.
PI adjusts circuit 111 and includes the first operational amplifier N1, second operational amplifier N2,3rd resistor R3, the 4th electricity
Hinder the capacitance 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 inverting input of the first operational amplifier N1 of another termination；
4th resistance R4 mono- terminates current limliting reference value signalI ref , the reverse input end of the first operational amplifier N1 of another termination；First fortune
Calculate the homophase input termination control reference ground of amplifier N1；Operation amplifier is connected across after 5th resistance R5 and the second capacitance C2 series connection
Between the inverting input and output terminal of device N1；First voltage-stabiliser tube D1 anodes connect operational amplifier N1 output terminals, the first voltage-stabiliser tube
D1 cathodes are connected with the second voltage-stabiliser tube D2 cathodes, and the second voltage-stabiliser tube D2 anodes connect the inverting input of operational amplifier N1；First
The output terminal of operational amplifier N1 connects the in-phase input end of second operational amplifier N2 by the 6th resistance R6；Second operation amplifier
The inverting input of device N2 is connected with output terminal, and second operational amplifier N2 output terminals are connected to isolation by the tenth resistance R10 and put
The input terminal of isolation operational amplifier N3 in big circuit 113.
Relay protective scheme circuit 112 include the second field-effect tube 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 base stage of the second field-effect tube V2 by the 7th resistance R7；8th resistance R8 connects
Between the base stage of the second field-effect tube V2 and source electrode；The source electrode of second field-effect tube V2 meets negative supply VEE；9th resistance R9 mono-
Terminate the drain electrode of the second field-effect tube V2, the cathode of the 3rd diode D3 of another termination；The anode of 3rd diode D3 be connected to every
Input terminal from 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 connects to secondary side reference the source electrode of insulated gate bipolar transistor npn npn V1；11st resistance R11 mono- termination isolation operation amplifiers
The output terminal of device N3, the in-phase input end of another termination four-operational amplifier N4, the 12nd resistance R12 mono- termination isolation computings
The output terminal of amplifier N3, the in-phase input end of the 5th operational amplifier N5 of another termination；Four-operational amplifier N4 and the 5th
The respective inverting inputs of operational amplifier N5 are all connected with its respective output terminal, and the output terminal connection of the two is followed by current limliting
The gate pole of insulated gate bipolar transistor npn npn V1 in circuit 101.
The utility model inhibits dash current using the variable resistor zone properties of field-effect tube V1 itself.Field-effect tube can
Become resistance zone properties be described as, when to driving voltage reach field-effect tube open threshold voltage and not up to needed for saturation conduction
During voltage value, the conducting resistance of field-effect tube changes with driving voltage value approximately linear, therefore the utility model is according to flowing through field
The electric current of effect pipe carrys out the driving voltage amplitude of closed-loop control field-effect tube V1, so as to adjust the conducting resistance of field-effect tube V1,
And then inhibit to flow through the dash current of field-effect tube V1, after bus capacitor C0 charges, field-effect tube V1 driving voltage width
Value is automatically adjusted to maximum, field-effect tube V1 saturation conductions.
In order to provide the saturation conduction voltage of field-effect tube V1, all operational amplifiers in the Current limited Control electric current 102
Powered using positive and negative 15V.
The PI is adjusted in circuit 111, and the first operational amplifier N1, the 5th resistance R5 and the second capacitance C2 forms PI and adjust
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 be 15V, the second voltage-stabiliser tube D2 voltage stabilizings value be 5V, second operational amplifier N2 starting voltage with
It is 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, enhances driving force.
In relay protective scheme circuit 112, power-on instruction is effective for low level, by controlling the second field-effect tube V2 and the three or two
The break-make of pole pipe D3 when realizing shutdown or protection clamps the negative voltages of the 3rd operational amplifier N3 input voltages.Second effect
Should pipe V2 source electrodes meet VEEFor -15V, therefore no matter why 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 utility model 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 exports to -5V, the second operation amplifier
Device N2 equally exports -5V.The 7th resistance R7 connects high level at this time, and the second field-effect tube 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
It should pipe V1 shut-offs.
When receiving power-on instruction, the second field-effect tube V2 shut-offs, the 3rd diode D3 cut-offs, relay protective scheme circuit 112 is not
It works.
After receiving power-on instruction, pi regulator is started to work, and the first operational amplifier N1 exits rapidly saturation, according to electric current
Sampling feedback value and the difference of current limliting set-point Iref 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 field-effect tube 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
Amplifier N1 is calculated into positive saturation state, output+15V voltages, by the first field-effect tube V1 saturation conductions.
When generation is protected or receives shutdown command, the second field-effect tube V2 and the 3rd diode D3 conductings, the first field-effect
The driving voltage of pipe V1 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, which is characterized 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 pole and bus capacitor C0Between anode, input current sample circuit gathers the input current of inverter, i.e. current limliting electricity
Road output current, the input current of inverter are sent as feedback signal to current-limiting control circuit；
Current-limiting circuit is made of the first field-effect tube V1, first resistor R1, second resistance R2 and the first capacitance C1, second resistance R2
The base stage of the first field-effect tube V1 is connected to, first resistor R1 and the first capacitance C1 are in parallel, are connected to the base stage of the first field-effect tube V1
Between source electrode；
Current-limiting control circuit exports the drive level signal of the first field-effect tube V1.
2. the startup current-limiting circuit of direct current supply switching power converters according to claim 1, which is characterized in that the limit
Flow control circuit includes PI and adjusts circuit, 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 It is input to PI and adjusts circuit, startup/shutdown/protection signal send relay protective scheme
Circuit, PI adjust circuit output and adjust voltage signal and the clamp signal feeding isolating amplifier circuit of relay protective scheme circuit output,
Isolating amplifier circuit outputs signals to the first field-effect tube V1 control terminals in current-limiting circuit.
3. the startup current-limiting circuit of direct current supply switching power converters according to claim 2, which is characterized in that the PI
It adjusts circuit and includes the first operational amplifier N1, 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 capacitance 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 anti-phase input of the first operational amplifier N1 of another termination
End；4th resistance R4 mono- terminates current limliting reference value signalI ref , the reverse input end of the first operational amplifier N1 of another termination；The
The homophase input termination control reference ground of one operational amplifier N1；Computing is connected across after 5th resistance R5 and the second capacitance C2 series connection
Between the inverting input and output terminal of amplifier N1；First voltage-stabiliser tube D1 anodes connect operational amplifier N1 output terminals, and first is steady
Pressure pipe D1 cathodes are connected with the second voltage-stabiliser tube D2 cathodes, and the second voltage-stabiliser tube D2 anodes connect the inverting input of operational amplifier N1；
The output terminal of first operational amplifier N1 connects the in-phase input end of second operational amplifier N2 by the 6th resistance R6；Second computing
The inverting input of amplifier N2 is connected with output terminal, second operational amplifier N2 output terminals by the tenth resistance R10 be connected to every
Input terminal from 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, which is characterized in that institute
It states relay protective scheme circuit and includes the second field-effect tube 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 base stage of the second field-effect tube V2 by the 7th resistance R7；8th resistance R8 is connected to
Between the base stage and source electrode of two field-effect tube V2；The source electrode of second field-effect tube V2 meets negative supply VEE；9th resistance R9 mono- is terminated
The drain electrode of second field-effect tube V2, the cathode of the 3rd diode D3 of another termination；The anode of 3rd diode D3 is connected to isolation and puts
The input terminal 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, which is characterized 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 the source of insulated gate bipolar transistor npn npn V1
Pole；The output terminal of 11st resistance R11 mono- termination isolation operational amplifiers N3, the same phase of another termination four-operational amplifier N4
Input terminal, the output terminal of the 12nd resistance R12 mono- termination isolation operational amplifiers N3, 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 the output terminal connection of the two is followed by into current-limiting circuit the gate pole of insulated gate bipolar transistor npn npn V1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721147986.0U CN207382184U (en) | 2017-09-08 | 2017-09-08 | The startup current-limiting circuit of direct current supply switching power converters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721147986.0U CN207382184U (en) | 2017-09-08 | 2017-09-08 | The startup current-limiting circuit of direct current supply switching power converters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207382184U true CN207382184U (en) | 2018-05-18 |
Family
ID=62340191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721147986.0U Withdrawn - After Issue CN207382184U (en) | 2017-09-08 | 2017-09-08 | The startup current-limiting circuit of direct current supply switching power converters |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207382184U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107370356A (en) * | 2017-09-08 | 2017-11-21 | 中国船舶重工集团公司第七0四研究所 | The startup current-limiting circuit of direct current supply switching power converters |
| CN109067158A (en) * | 2018-08-21 | 2018-12-21 | 北方电子研究院安徽有限公司 | A kind of elimination DC power supply starting overshoot protection circuit |
| CN110912095A (en) * | 2019-11-14 | 2020-03-24 | 中国航空工业集团公司西安航空计算技术研究所 | Overvoltage and impact current resistant starting circuit |
-
2017
- 2017-09-08 CN CN201721147986.0U patent/CN207382184U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107370356A (en) * | 2017-09-08 | 2017-11-21 | 中国船舶重工集团公司第七0四研究所 | The startup current-limiting circuit of direct current supply switching power converters |
| CN107370356B (en) * | 2017-09-08 | 2023-08-18 | 中国船舶重工集团公司第七0四研究所 | Start current limiting circuit of DC power supply switching power supply converter |
| CN109067158A (en) * | 2018-08-21 | 2018-12-21 | 北方电子研究院安徽有限公司 | A kind of elimination DC power supply starting overshoot protection circuit |
| CN109067158B (en) * | 2018-08-21 | 2024-01-26 | 北方电子研究院安徽有限公司 | Protection circuit for eliminating starting overshoot of direct-current power supply |
| CN110912095A (en) * | 2019-11-14 | 2020-03-24 | 中国航空工业集团公司西安航空计算技术研究所 | Overvoltage and impact current resistant starting circuit |
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Granted publication date: 20180518 Effective date of abandoning: 20230818 |