CN107404222A - The soft starting circuit of DC supply high-power inverter - Google Patents
The soft starting circuit of DC supply high-power inverter Download PDFInfo
- Publication number
- CN107404222A CN107404222A CN201710804749.5A CN201710804749A CN107404222A CN 107404222 A CN107404222 A CN 107404222A CN 201710804749 A CN201710804749 A CN 201710804749A CN 107404222 A CN107404222 A CN 107404222A
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- current
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- operational amplifier
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Classifications
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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
Abstract
The present invention relates to a kind of soft starting circuit of DC supply high-power inverter, bus capacitor C0Inverter input both ends are connected in parallel on, current-limiting circuit is serially connected with input DC power positive pole and bus capacitor C0Between positive pole, input current sample circuit gathers the input current of inverter, i.e. current-limiting circuit output current, the input current of inverter delivers to current-limiting control circuit as feedback signal；Insulated gate bipolar transistor npn npn V1 drive level, dash current when suppressing to start in current-limiting control circuit closed loop regulation current-limiting circuit.Insulated gate bipolar transistor npn npn conducting resistance can be automatically adjusted to limit dash current, parallel resistance R1 shares part starting current on insulated gate bipolar transistor npn npn, reduce the instantaneous power consumption of insulated gate bipolar transistor npn npn, save soft start resistance and the contactor under usual manner, soft to open controlled current flow with simple in construction, soft to open speed fast, the advantages of control strategy is simple, and reliability is high.
Description
Technical field
The present invention relates to a kind of Power Electronic Technique, the soft start electricity of more particularly to a kind of DC supply high-power inverter
Road.
Background technology
In order to ensure the stationarity of high-power inverter input direct current supply, generally in large power inverter power source input
The electrochemical capacitor of a Large Copacity in parallel（Commonly referred to as bus capacitor）To filter out low-frequency noise.Large power inverter power source hard reboot
When, bus capacitor has larger pressure difference with input DC power, will produce larger dash current.Used under conventional current limliting scheme
Contactor coordinates power resistor to carry out soft start, power resistor limitation dash current, treats bus capacitor voltage and input dc power
Contactor is closed when source voltage is close to bypass power resistor, completes soft start.The power resistor and contact body of conventional scheme
Product is big, is unfavorable for improving inverter power density, and it is longer to start the time（Usually 0.5s-10s）, it is not suitable for requirement startup
Time is the workplace of millisecond.
The content of the invention
The problem of existing the present invention be directed to conventional soft start-up scheme, it is proposed that a kind of DC supply high-power inverter
Soft starting circuit, the improved soft start-up scheme for suppression high-power inverter inrush current.
The technical scheme is that：A kind of soft starting circuit of DC supply high-power inverter, including current-limiting circuit,
Input current sample circuit and current-limiting control circuit；Bus capacitor C0Inverter input both ends are connected in parallel on, current-limiting circuit is serially connected with
Input DC power positive pole and bus capacitor C0Between positive pole, input current sample circuit gathers the input current of inverter, i.e.,
Current-limiting circuit output current, the input current of inverter deliver to current-limiting control circuit as feedback signal；
Described current-limiting circuit is by insulated gate bipolar transistor npn npn V1, first resistor R1, second resistance R2 and the first electric capacity C1
Form；First resistor R1 is connected in parallel on insulated gate bipolar transistor npn npn V1 collector and emitter both ends, first resistor R1 with
Insulated gate bipolar transistor npn npn V1 conducting resistance distribution charging current in parallel；Second resistance R2 and the first electric capacity C1 is in parallel,
It is connected between insulated gate bipolar transistor npn npn V1 base stage and source electrode, the effect for preventing driving voltage from shaking；
Insulated gate bipolar transistor npn npn V1 drive level in current-limiting control circuit closed loop regulation current-limiting circuit, when suppressing to start
Dash current.
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 insulated gate bipolar transistor npn npn 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 soft starting circuit of DC supply high-power inverter of the present invention, can be adjusted automatically
Insulated gate bipolar transistor npn npn conducting resistance is saved to limit dash current, first resistor R1 shares part starting current, reduces
The instantaneous power consumption of insulated gate bipolar transistor npn npn, soft start resistance and contactor under usual manner are saved, there is structure letter
It is single, soft to open controlled current flow, the advantages of soft speed that opens is fast, and control strategy is simple, and reliability is high.
Brief description of the drawings
Fig. 1 is DC supply high-power inverter soft starting circuit block diagram of the present invention；
Fig. 2 is current-limiting control circuit schematic diagram of the present invention；
Fig. 3 is soft start simulation waveform of the present invention.
Embodiment
DC supply high-power inverter soft starting circuit block diagram as shown in Figure 1, it is soft open circuit include current-limiting circuit 101,
Input current sample circuit and current-limiting control circuit 102.Bus capacitor C0It is connected in parallel on inverter input both ends, current-limiting circuit 101
It is serially connected with input DC power positive pole and bus capacitor C0Between positive pole, the input electricity of input current sample circuit collection inverter
Stream, i.e. the output current of current-limiting circuit 101, using the input current of inverter as feedback signal, current-limiting control circuit 102 is delivered to,
Insulated gate bipolar transistor npn npn V1 drive level, is then adjusted in the closed loop of current-limiting control circuit 102 regulation current-limiting circuit 101
Insulated gate bipolar transistor npn npn V1 conducting resistance come suppress start when dash current.
Described current-limiting circuit 101 is by insulated gate bipolar transistor npn npn V1, first resistor R1, second resistance R2 and first
Electric capacity C1 is formed.First resistor R1 is connected in parallel on insulated gate bipolar transistor npn npn V1 collector and emitter both ends, shares portion
Divide starting current, reduce the instantaneous power consumption of insulated gate bipolar transistor npn npn, insulated gate bipolar transistor npn npn is operated in peace
In full workspace, avoid instantaneous overheat and damage；Second resistance R2 and the first electric capacity C1 is in parallel, is connected to insulated gate bipolar type crystalline substance
Between body pipe V1 base stage and source electrode, reinforced insulation grid bipolarity transistor npn npn Miller effect is played, prevents driving voltage from shaking
Effect.
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 insulated gate bipolar transistor npn npn V1 itself variable resistor zone properties.Absolutely
Edge grid bipolarity transistor npn npn variable resistor zone properties are described as, when reach insulated gate bipolar transistor npn npn to driving voltage
Threshold voltage is opened not up to needed for saturation conduction during magnitude of voltage, the conducting resistance of insulated gate bipolar transistor npn npn is with driving
Magnitude of voltage approximately linear changes, therefore the present invention insulate according to the electric current for flowing through insulated gate bipolar transistor npn npn come closed-loop control
Grid bipolarity transistor npn npn V1 driving voltage amplitude, so as to adjust insulated gate bipolar transistor npn npn V1 conducting resistance, enters
And suppress to flow through insulated gate bipolar transistor npn npn V1 dash current, as bus capacitor C0After charging, insulated gate bipolar
Property transistor npn npn V1 driving voltage amplitudes are automatically adjusted to maximum, insulated gate bipolar transistor npn npn V1 saturation conductions.
In order to provide insulated gate bipolar transistor npn npn V1 saturation conduction voltage, institute in the Current limited Control electric current 102
There is operational amplifier to be 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, isolation operational amplifier N3
Input is clamped to negative pressure value, and four-operational amplifier N4 and the 5th operational amplifier N5 follow output negative pressure value, by insulated gate
Bipolarity transistor npn npn V1 is turned off.
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-pointI ref Difference adjust output voltage rapidly, 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. insulated gate bipolar transistor npn npn V1 driving voltage
Maintain a fixed value constant, bus capacitor C0With cut-off current constant-current charge.First resistor R1 and insulated gate bipolar transistor npn npn
V1 conducting resistance distribution charging current in parallel, shortens and starts the time, reduce insulated gate bipolar transistor npn npn V1 loss, keep away
Exempt from insulated gate bipolar transistor npn npn V1 to damage because of short-time overheating.
During normal work, bus capacitor C0Electricity is had been filled with, current sample value of feedback is less than current limliting set-pointI ref , the first fortune
Calculate amplifier N1 and enter positive saturation state, output+15V voltages, by insulated gate bipolar transistor npn npn V1 saturation conductions.Insulated gate
During bipolarity transistor npn npn V1 saturation conductions, conducting resistance can be ignored compared with first resistor, therefore operating current is exhausted
Most of to be powered by insulated gate bipolar transistor npn npn V1 for large power inverter power source, first resistor R1 loss can be ignored
Disregard.
When generation is protected or receives shutdown command, the second FET V2 and the 3rd diode D3 conductings, insulated gate bipolar
Property transistor npn npn V1 driving voltage is clamped to negative voltage, and V1 is turned off.
Soft start simulation waveform as shown in Figure 3, the current-limited waveform in start-up course, dash current can be effectively suppressed,
It is short to start the time.
Claims (5)
1. a kind of soft starting circuit of DC supply high-power inverter, it is characterised in that adopted including current-limiting circuit, input current
Sample circuit and current-limiting control circuit；Bus capacitor C0Inverter input both ends are connected in parallel on, current-limiting circuit is serially connected with input dc power
Source positive pole and bus capacitor C0Between positive pole, input current sample circuit gathers the input current of inverter, i.e. current-limiting circuit is defeated
Go out electric current, the input current of inverter delivers to current-limiting control circuit as feedback signal；
Described current-limiting circuit is by insulated gate bipolar transistor npn npn V1, first resistor R1, second resistance R2 and the first electric capacity C1
Form；First resistor R1 is connected in parallel on insulated gate bipolar transistor npn npn V1 collector and emitter both ends, first resistor R1 with
Insulated gate bipolar transistor npn npn V1 conducting resistance distribution charging current in parallel；Second resistance R2 and the first electric capacity C1 is in parallel,
It is connected between insulated gate bipolar transistor npn npn V1 base stage and source electrode, the effect for preventing driving voltage from shaking；
Insulated gate bipolar transistor npn npn V1 drive level in current-limiting control circuit closed loop regulation current-limiting circuit, when suppressing to start
Dash current.
2. the soft starting circuit of DC supply high-power inverter according to claim 1, it is characterised in that the current limliting control
Circuit processed includes PI regulation circuits, relay protective scheme circuit and isolating amplifier circuit；Input current sample circuit collection inverter
Input current and current limliting reference value signalI ref PI regulation circuits are input to, startup/shutdown/protection signal send relay protective scheme circuit,
PI adjusts circuit output regulation voltage signal and the clamp signal of relay protective scheme circuit output is sent into isolating amplifier circuit, and isolation is put
Insulated gate bipolar transistor npn npn V1 control terminals in big circuit output signal to current-limiting circuit.
3. the soft starting circuit of DC supply high-power inverter according to claim 2, it is characterised in that the PI regulations
Circuit includes the first operational amplifier N1, the second operational amplifier N2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the
The six resistance electric capacity of 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.
4. the soft starting circuit of DC supply high-power inverter according to Claims 2 or 3, it is characterised in that the guarantor
Shield logic circuit includes 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 soft starting circuit of DC supply high-power inverter according to claim 4, it is characterised in that the isolation is put
Big circuit include isolation operational amplifier N3, four-operational amplifier N4, the 5th operational amplifier N5, the 11st resistance R11 and
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 |
|---|---|---|---|
| CN201710804749.5A CN107404222B (en) | 2017-09-08 | 2017-09-08 | Soft start circuit of direct-current power supply high-power inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710804749.5A CN107404222B (en) | 2017-09-08 | 2017-09-08 | Soft start circuit of direct-current power supply high-power inverter |
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| Publication Number | Publication Date |
|---|---|
| CN107404222A true CN107404222A (en) | 2017-11-28 |
| CN107404222B CN107404222B (en) | 2023-09-19 |
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ID=60397607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710804749.5A Active CN107404222B (en) | 2017-09-08 | 2017-09-08 | Soft start circuit of direct-current power supply high-power inverter |
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| Country | Link |
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| CN (1) | CN107404222B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110661400A (en) * | 2018-06-28 | 2020-01-07 | 杰力科技股份有限公司 | Voltage conversion circuit and control circuit thereof |
| CN111525497A (en) * | 2020-05-26 | 2020-08-11 | 广东博智林机器人有限公司 | Buffer circuit and electronic equipment |
| CN112564472A (en) * | 2020-11-30 | 2021-03-26 | 江苏科技大学 | Direct-current high-power supply soft start circuit and method |
| CN114244163A (en) * | 2021-12-21 | 2022-03-25 | 广州市文信自动化技术有限公司 | 220V voltage-stabilizing inverter power supply |
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| CN112564472A (en) * | 2020-11-30 | 2021-03-26 | 江苏科技大学 | Direct-current high-power supply soft start circuit and method |
| CN112564472B (en) * | 2020-11-30 | 2021-11-26 | 江苏科技大学 | Direct-current high-power supply soft start circuit and method |
| CN114244163A (en) * | 2021-12-21 | 2022-03-25 | 广州市文信自动化技术有限公司 | 220V voltage-stabilizing inverter power supply |
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| Publication number | Publication date |
|---|---|
| CN107404222B (en) | 2023-09-19 |
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