CN109600059A - A kind of soft starting circuit of DC bus-bar voltage - Google Patents
A kind of soft starting circuit of DC bus-bar voltage Download PDFInfo
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- CN109600059A CN109600059A CN201811547678.6A CN201811547678A CN109600059A CN 109600059 A CN109600059 A CN 109600059A CN 201811547678 A CN201811547678 A CN 201811547678A CN 109600059 A CN109600059 A CN 109600059A
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- module
- transformer
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- drive
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Classifications
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
-
- 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
Abstract
The present invention discloses a kind of soft starting circuit of DC bus-bar voltage, comprising: transformer, drive module and drive control module；The input terminal of the transformer is connect with the output end of the drive module, and the output end of the transformer with dc-link capacitance for connecting；The transformer is used to charge to the dc-link capacitance, to start DC bus-bar voltage；The control terminal of the drive module is connect with the output end of the drive control module；The drive control module output control signal, to drive the drive module according to the control signal；The input terminal of the drive module with input voltage source for connecting；The voltage that the drive module is used to be inputted according to the input voltage source drives the transformer, to start the DC bus-bar voltage by the transformer.Therefore, above-mentioned soft starting circuit, which makes the voltage which kind of form no matter is inputted in circuit, can convert input voltage into the starting voltage of bus capacitor.
Description
Technical field
The present invention relates to uninterruptible power supply technical field more particularly to a kind of soft starting circuits of DC bus-bar voltage.
Background technique
In existing uninterruptible power system, dc-link capacitance is indispensable on line type UPS (uninterruptible power supply)
A part, also referred to as DC bus-bar voltage.Dc-link capacitance needs energy-storage function, in UPS conversion, at least provides 1/
4 output frequencies energy more than period, therefore capacitance is generally all bigger, and directly proportional to the output power of UPS.If straight
It connects direct current input bus capacitance, when capacitor is empty, is equivalent to short circuit, a very big electric current can be generated at this time,
To damage fuse or escape input protective switch.In order to avoid such situation, the dc-link capacitance primary demand one of UPS
A soft starting circuit.
The complicated multiplicity of the input of UPS, there is exchange, also there is battery DC, and exchange has L+N, also there is three-phase firewire.Battery has
The single battery voltage at +/- the two poles of the earth also has with middle line, the bipolar cell of +/N/-.The powerful UPS in is currently with one
A resistance adds the mode of relay to be pre-charged dc-link capacitance, such as Fig. 1 and as shown in Figure 2.
These traditional mode routes are fairly simple, and parts number is few.But have the shortcomings that obvious:
1, route is not isolated, and needs to have direct circuit with bus capacitor.
2, bus voltage value is restricted, and can only be less than the voltage peak of input；For example input is 310Vpk, Vbus is
360Vdc。
3, power loss is big.
4, initial current is big, electric current be it is first big after small, contactor, which has, glues dead hidden danger.
Summary of the invention
In view of the above shortcomings, the present invention provides a kind of soft starting circuits of DC bus-bar voltage, so that in circuit
The voltage which kind of form no matter inputted can convert input voltage into the starting voltage of bus capacitor.
To solve the above-mentioned problems, the present invention provides a kind of soft starting circuit of DC bus-bar voltage, including transformer, drive
Dynamic model block and drive control module；The input terminal of the transformer is connect with the output end of the drive module, the transformation
The output end of device with dc-link capacitance for connecting；The transformer is used to charge to the dc-link capacitance, with starting
DC bus-bar voltage；The control terminal of the drive module is connect with the output end of the drive control module；The drive control
Module output control signal, to drive the drive module according to the control signal；The input terminal of the drive module is used for
It is connect with input voltage source；The voltage that the drive module is used to be inputted according to the input voltage source drives the transformer,
To start the DC bus-bar voltage by the transformer.
Preferably, the drive module includes the first thyristor and the second metal-oxide-semiconductor；First semiconductor is opened
Close element control terminal connect with the output end of the drive control module, the input terminal of first thyristor and
One end of the input voltage source connects, the first input of the output end and the transformer of first thyristor
Terminal connection；The control terminal of second thyristor is connect with the output end of the drive control module, and described
The input terminal of two thyristors is connect with the second input terminal of the transformer, second thyristor
Output end connect with the other end of the input voltage source.
Preferably, the drive control module includes PWM controller；The output end of the PWM controller respectively with it is described
The control terminal of first thyristor, the connection of the control terminal of second thyristor；The PWM controller is defeated
The control signal of pulsewidth modulation out, to control first thyristor and second thyristor
Conduction ratio.
It preferably, further include current sampling module；The input terminal of the current sampling module is opened with second semiconductor
The output end connection of element is closed, the output end of the current sampling module is connect with the other end of the input voltage source；It is described
Current sampling module is used to acquire the input current of the transformer；The current sampling module also with the drive control module
Connection, the input current of collected transformer is exported to the drive control module, by the drive control module root
The control signal is exported according to the input current of the collected transformer.
Preferably, the current sampling module includes current sampling resistor；One end of the current sampling resistor with it is described
The output end of second thyristor connects, and the other end of the current sampling resistor is another with the input voltage source
End connection；The drive control module reads the voltage of the current sampling resistor, according to the voltage of the current sampling resistor
Export the control signal.
Preferably, it is preset voltage value that the drive control module, which is used to read the voltage of the current sampling resistor,
When, export the control signal for closing first thyristor and second thyristor.
Preferably, the input voltage source is DC voltage source or alternating-current voltage source.
Preferably, the input voltage source is alternating-current voltage source；The soft starting circuit further includes rectification module；It is described whole
The input terminal of flow module is connect with the output end of the alternating-current voltage source, the output end of the rectification module and the drive module
Input terminal connection；The alternating current that the rectification module is used to export the alternating-current voltage source carries out rectification processing.
Preferably, the rectification module is that the alternating current for exporting to the alternating-current voltage source carries out the complete of full-wave rectification
Wave rectification module, or the half-wave rectification block for the alternating current progress halfwave rectifier for being exported to the alternating-current voltage source.
Beneficial effects of the present invention:
The soft starting circuit of above-mentioned DC bus-bar voltage, input voltage source connect transformer, transformer by drive module
Output end connect dc-link capacitance.Drive control module is for starting drive module.It is driven when drive control module starts
When module, the control signal that drive module is exported according to drive control module, control input voltage source is input to the electricity of transformer
It charges after pressing signal, transformer to receive voltage signal to dc-link capacitance.Therefore, dc-link capacitance and input voltage source
Isolation, the voltage which kind of form no matter inputted can convert input voltage into the starting voltage of bus capacitor.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it is clear that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structure chart that the resistance in one embodiment of the invention adds the mode of relay to be pre-charged dc-link capacitance
Composition schematic diagram；
Fig. 2 is the structure that the resistance in another embodiment of the present invention adds the mode of relay to be pre-charged dc-link capacitance
Figure composition schematic diagram；
Fig. 3 is the structural block diagram of the soft starting circuit of the DC bus-bar voltage in one embodiment of the invention；
Fig. 4 is the circuit structure diagram of the soft starting circuit of the DC bus-bar voltage in a specific embodiment of the invention；
Fig. 5 is the implementation schematic diagram of the soft starting circuit of the DC bus-bar voltage in a specific embodiment of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
Fig. 3 please be consider and examine, Fig. 3 is that the structure chart composition of the soft starting circuit of the DC bus-bar voltage in the embodiment of the present invention shows
It is intended to.
As shown in figure 3, the soft starting circuit 20 of the DC bus-bar voltage includes transformer 250, drive module 230 and drives
Dynamic control module 210.
The input terminal of transformer 250 is connect with the output end of drive module 230, the output end of transformer 250 be used for it is straight
Bus capacitor 30 is flowed to connect.Transformer 250 is used to charge to dc-link capacitance 30, to start DC bus-bar voltage.It is real one
It applies in mode, the power of transformer 250 is greater than or equal to 10W, and is less than or equal to 20W.Transformer 250 can be positive activation type
It can be inverse-excitation type access circuit.
The control terminal of drive module 230 is connect with the output end of drive control module 210, and drive control module 210 exports
Signal is controlled, to drive the drive module 230 according to control signal.The input terminal of drive module 230 is used for and input voltage
Source 10 connects.Input voltage source 10 is DC voltage source or alternating-current voltage source.Drive module 230 is used for according to input voltage source 10
The voltage driving transformer 250 of input, to start DC bus-bar voltage by transformer 250.
In one embodiment, drive module 230 includes the first thyristor and the second thyristor.The
The control terminal of semiconductor switch element is connect with the output end of drive control module 210, the first thyristor it is defeated
Enter end to connect with one end of input voltage source 10, the first input of the output end and transformer 250 of the first thyristor
Terminal connects described in.The control terminal of second thyristor is connect with the output end of drive control module 210, and the second half
The input terminal of conductor switch element is connect with the second input terminal of transformer 250, the output end of the second thyristor
It is connect with the other end of input voltage source 10.Specifically, the first thyristor can be metal-oxide-semiconductor or other semiconductors
Switching tube.Second thyristor can be metal-oxide-semiconductor or other semiconductor switch pipes.
Wherein, drive control module 210 includes PWM (pulsewidth modulation) controller.The output end of PWM controller is respectively with
The control terminal of semiconductor switch element, the connection of the control terminal of the second thyristor；The modulation of PWM controller output pulse width
Control signal, to control the conduction ratio of the first thyristor and the second thyristor.Specifically, PWM
Controller can be UC3845 chip or other pwm chips.In a specific embodiment, PWM controller is
UC3845 chip.First thyristor is the first metal-oxide-semiconductor, and the second thyristor is the second metal-oxide-semiconductor.UC3845
The output end of chip is connect with the control terminal of the control terminal of the first metal-oxide-semiconductor, the second metal-oxide-semiconductor respectively.UC3845 chip output pulse width
The control signal of modulation, to control the conduction ratio of the first metal-oxide-semiconductor and the second metal-oxide-semiconductor.
In an embodiment of the embodiment, soft starting circuit further includes current sampling module (not shown).Electric current
The input terminal of sampling module is connect with the output end of the second metal-oxide-semiconductor, output end and the input voltage source 10 of current sampling module
Other end connection.Current sampling module is used to acquire the input current of transformer 250.Wherein, current sampling module also with driving
Control module 210 connects, and the input current of collected transformer 250 is exported to drive control module 210, to be controlled by driving
Molding block 210 exports control signal according to the input current of collected transformer 250.Specifically, current sampling module includes
Current sampling resistor.One end of current sampling resistor is connect with the output end of the second metal-oxide-semiconductor, the other end of current sampling resistor with
The other end of input voltage source 10 connects.Drive control module 210 reads the voltage of current sampling resistor, according to current sample electricity
The voltage output of resistance controls signal.Wherein, it is default electricity that drive control module 210, which is used to read the voltage of current sampling resistor,
When pressure value, output is input to dc-link capacitance 30 for closing the control signal of the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, with control
Voltage value.
In one embodiment, when input voltage source 10 is alternating-current voltage source, soft starting circuit further includes rectification module (figure
Do not show).The input terminal of rectification module and the output end of alternating-current voltage source connect, the output end and drive module 230 of rectification module
Input terminal connection.Rectification module is for carrying out rectification processing to the alternating current that alternating-current voltage source exports.Specifically, rectification module
The full-wave rectification block of full-wave rectification is carried out, or for the alternating current for exporting to alternating-current voltage source for for alternating-current voltage source
The alternating current of output carries out the half-wave rectification block of halfwave rectifier.
A specific embodiment presented below, soft starting circuit described in any of the above-described embodiment is described in detail, specifically
It is shown in Figure 4:
Fig. 4 is the circuit structure diagram of soft starting circuit of the present invention: the present invention designs a transformation to be isolated entirely
Device is the translation circuit of core.As shown in figure 4, transformer TX2 design power can be with very little, 10~20W.Its no-load voltage ratio can be with
It adjusts according to actual needs.Further, a driving circuit is made in periphery again, switch element is done with metal-oxide-semiconductor, such as figure switching tube Q1
With shown in switching tube Q2.The input value size for considering input voltage, can be used the form of single tube or double-tube series.It uses control section
UC3845 chip.UC3845 chip sends out PWM waveform, is started with control switch pipe Q1 and switching tube Q2.Electricity is arranged in the present invention
Stream feedback, realizes peak value comparison method, limits power output.Busbar voltage rises to setting value, and soft start enable signal is closed,
Entire route stops working.
The working method of the circuit structure diagram of above-mentioned soft starting circuit is explained below:
1, input power enters from input terminal, if input power is alternating current, two pipes rectification half is added before switching tube Q1
Wave or all-wave module.
2, UC3845 chip first presses maximum duty ratio (such as 50%) and issues PWM waveform, drives two metal-oxide-semiconductors, opens
Close the starting of pipe Q1 and switching tube Q2.
3, when switching tube Q1 and switching tube Q2 is connected, transformer TX2 energy storage.When switching tube Q1 and switching tube Q2 ends,
Transformer TX2 discharges energy storage, charges to dc-link capacitance.
4, resistance R6 be current sampling resistor, when the voltage at the both ends resistance R6 be 1V when, UC3845 chip start current limliting and
PWM waveform is closed, therefore uses peak value comparison method, the process power of dc-link capacitance charging can be constant side
Formula.
Overall plan schematic diagram is shown in Figure 5.Therefore, any property voltage no matter is inputted, no matter defeated AC or DC is
Enter the high or low of the voltage value of voltage, either what reference voltage, bus capacitor common reference point of getting along well, is not same
System can be realized using soft starting circuit of the present invention.Soft starting circuit can be regarded as a flight data recorder, regardless of assorted
Voltage may all be converted to the starting voltage for needing dc-link capacitance.
The soft starting circuit for being provided for the embodiments of the invention a kind of DC bus-bar voltage above is described in detail,
It is employed herein that a specific example illustrates the principle and implementation of the invention, the explanation of above embodiments is only used
In facilitating the understanding of the method and its core concept of the invention；At the same time, for those skilled in the art, according to the present invention
Thought, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification should not be construed as
Limitation of the present invention.
Claims (9)
1. a kind of soft starting circuit of DC bus-bar voltage, which is characterized in that including transformer, drive module and drive control
Module；
The input terminal of the transformer is connect with the output end of the drive module, and the output end of the transformer is used for and direct current
Bus capacitor connection；The transformer is used to charge to the dc-link capacitance, to start DC bus-bar voltage；
The control terminal of the drive module is connect with the output end of the drive control module；The drive control module output control
Signal processed, to drive the drive module according to the control signal；
The input terminal of the drive module with input voltage source for connecting；The drive module is used for according to the input voltage
The voltage of source input drives the transformer, to start the DC bus-bar voltage by the transformer.
2. soft starting circuit according to claim 1, which is characterized in that the drive module includes the first semiconductor switch
Element and the second thyristor；The control terminal of first thyristor is defeated with the drive control module
Outlet connection, the input terminal of first thyristor connect with one end of the input voltage source, and described the first half
The output end of conductor switch element is connect with the first input end of the transformer；The control of second thyristor
End processed is connect with the output end of the drive control module, the input terminal and the transformer of second thyristor
The connection of the second input terminal, the other end of the output end of second thyristor and the input voltage source connects
It connects.
3. soft starting circuit according to claim 2, which is characterized in that the drive control module includes PWM controller；
The output end of the PWM controller respectively with the control terminal of first thyristor, second semiconductor switch
The control terminal of element connects；The control signal of the PWM controller output pulse width modulation, to control first semiconductor switch
The conduction ratio of element and second thyristor.
4. soft starting circuit according to claim 2, which is characterized in that further include current sampling module；The electric current is adopted
The input terminal of egf block is connect with the output end of second thyristor, the output end of the current sampling module with
The other end of the input voltage source connects；The current sampling module is used to acquire the input current of the transformer；It is described
Current sampling module is also connect with the drive control module, and the input current of collected transformer is exported to the driving
Control module is believed with exporting the control according to the input current of the collected transformer by the drive control module
Number.
5. soft starting circuit according to claim 4, which is characterized in that the current sampling module includes current sample electricity
Resistance；One end of the current sampling resistor is connect with the output end of second thyristor, the current sample electricity
The other end of resistance is connect with the other end of the input voltage source；The drive control module reads the current sampling resistor
Voltage controls signal according to the voltage output of the current sampling resistor.
6. soft starting circuit according to claim 5, which is characterized in that the drive control module is described for reading
When the voltage of current sampling resistor is preset voltage value, export for closing first thyristor and described second
The control signal of thyristor.
7. soft starting circuit according to claim 1, which is characterized in that the input voltage source is DC voltage source or friendship
Galvanic electricity potential source.
8. soft starting circuit according to claim 1, which is characterized in that the input voltage source is alternating-current voltage source；Institute
Stating soft starting circuit further includes rectification module；The input terminal of the rectification module is connect with the output end of the alternating-current voltage source,
The output end of the rectification module is connect with the input terminal of the drive module；The rectification module is used for the alternating voltage
The alternating current of source output carries out rectification processing.
9. soft starting circuit according to claim 8, which is characterized in that the rectification module is for the alternating current
The alternating current of potential source output carries out the full-wave rectification block of full-wave rectification, or is the exchange for exporting to the alternating-current voltage source
Electricity carries out the half-wave rectification block of halfwave rectifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811547678.6A CN109600059A (en) | 2018-12-18 | 2018-12-18 | A kind of soft starting circuit of DC bus-bar voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811547678.6A CN109600059A (en) | 2018-12-18 | 2018-12-18 | A kind of soft starting circuit of DC bus-bar voltage |
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| Publication Number | Publication Date |
|---|---|
| CN109600059A true CN109600059A (en) | 2019-04-09 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811547678.6A Pending CN109600059A (en) | 2018-12-18 | 2018-12-18 | A kind of soft starting circuit of DC bus-bar voltage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110932540A (en) * | 2019-12-23 | 2020-03-27 | 广东宝星新能科技有限公司 | Low-cost isolated bus soft start circuit applied to UPS |
| CN112737417A (en) * | 2020-12-23 | 2021-04-30 | 扬州曙光光电自控有限责任公司 | Alternating current servo driver soft start circuit and working method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207926461U (en) * | 2018-03-28 | 2018-09-28 | 浙江艾罗网络能源技术有限公司 | A kind of AC-DC isolated variable circuits for soft of bus capacitor |
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- 2018-12-18 CN CN201811547678.6A patent/CN109600059A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207926461U (en) * | 2018-03-28 | 2018-09-28 | 浙江艾罗网络能源技术有限公司 | A kind of AC-DC isolated variable circuits for soft of bus capacitor |
Non-Patent Citations (1)
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| 封心歌: "高压双管反激变换器的设计", 《现代雷达》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110932540A (en) * | 2019-12-23 | 2020-03-27 | 广东宝星新能科技有限公司 | Low-cost isolated bus soft start circuit applied to UPS |
| CN112737417A (en) * | 2020-12-23 | 2021-04-30 | 扬州曙光光电自控有限责任公司 | Alternating current servo driver soft start circuit and working method thereof |
| CN112737417B (en) * | 2020-12-23 | 2022-05-20 | 扬州曙光光电自控有限责任公司 | Alternating current servo driver soft start circuit and working method thereof |
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Application publication date: 20190409 |