CN110534323A - The three-phase transformer of on-load voltage regulation driving switch circuit and the application switching circuit - Google Patents
The three-phase transformer of on-load voltage regulation driving switch circuit and the application switching circuit Download PDFInfo
- Publication number
- CN110534323A CN110534323A CN201910921508.8A CN201910921508A CN110534323A CN 110534323 A CN110534323 A CN 110534323A CN 201910921508 A CN201910921508 A CN 201910921508A CN 110534323 A CN110534323 A CN 110534323A
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- Prior art keywords
- drive module
- igbt drive
- phototriode
- voltage regulation
- load voltage
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- 230000033228 biological regulation Effects 0.000 title claims abstract description 39
- 230000035939 shock Effects 0.000 claims description 20
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000010891 electric arc Methods 0.000 abstract description 5
- 230000005611 electricity Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/74—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of diodes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
- H03K17/795—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar transistors
- H03K17/7955—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar transistors using phototransistors
Abstract
The invention belongs to the three-phase transformers of three-phase transformer on-load voltage regulation technical field more particularly to a kind of on-load voltage regulation driving switch circuit and the application switching circuit.The on-load voltage regulation driving switch circuit can realize the on-load voltage regulation to three-phase transformer, have many advantages, such as to be swift in response, adjustment speed is fast, switching is without electric arc, can provide help to improve the stability of distribution system output voltage and exporting power quality.On-load voltage regulation driving switch circuit includes: the first photo-coupler, the second photo-coupler；First photo-coupler is made of the first light emitting diode, the first phototriode, and the second photo-coupler is made of the second light emitting diode, the second phototriode；Wherein, the first light emitting diode is for receiving the first driving control signal；Second light emitting diode is for receiving the second driving control signal；Comparison amplifier；First IGBT drive module, the second IGBT drive module, third IGBT drive module.
Description
Technical field
The invention belongs to three-phase transformer on-load voltage regulation technical field more particularly to a kind of on-load voltage regulation driving switch circuits
And the three-phase transformer using the switching circuit.
Background technique
To adapt to the high speed development of national economy and the living standards of the people of continuous improvement, the voltage matter of power distribution network is improved
Amount and reliability are a technical problems very urgent, urgently to be resolved.As stablizing the maximally efficient mode of network voltage,
On-load voltage regulation three-phase transformer is changed by carrying automatic Regulation tap switch, realization according to three-phase transformer output voltage automatically
The tap of three-phase transformer side come finally realize it is secondary adjustment output voltage purpose.However inventors have found that tradition has
Voltage adjustment of on-load switch there are switching arc, movement response is slow the defects of, can to three-phase transformer equipment generate impact and electricity
Magnetic disturbance is unfavorable for improving the stability of distribution system output voltage and improves output power quality.
Summary of the invention
The present invention provides the three-phase transformers of a kind of on-load voltage regulation driving switch circuit and the application switching circuit, should
On-load voltage regulation driving switch circuit can realize the on-load voltage regulation to three-phase transformer, have be swift in response, adjustment speed is fast, switching
The advantages that without electric arc, can provide help for the stability and output power quality for improving distribution system output voltage.
In order to solve the above technical problems, present invention employs following technical solutions:
On-load voltage regulation driving switch circuit includes:
First photo-coupler, the second photo-coupler；First photo-coupler is by the first light emitting diode, the first phototriode
It constitutes, the second photo-coupler is made of the second light emitting diode, the second phototriode；Wherein, the first light emitting diode is used for
The first driving control signal is received, the control of the first phototriode is extremely mutually adjoining with the emission side of the first light emitting diode,
The input of first phototriode is extremely connected with positive pole；Second light emitting diode is for receiving the second drive control letter
Number, the second phototriode control it is extremely mutually adjoining with the emission side of the second light emitting diode, the second phototriode it is defeated
Enter and is extremely connected with positive pole；
Comparison amplifier；The output of first phototriode is extremely connected with the first input end of comparison amplifier, the
The output of two phototriodes is extremely connected with the second input terminal of comparison amplifier；
First IGBT drive module, the second IGBT drive module, third IGBT drive module；Wherein, comparison amplifier
Output end is connected with the gate terminal of the gate terminal of the first IGBT drive module, the second IGBT drive module respectively；First IGBT
The source terminal of drive module is connected with positive pole, the drain electrode end of the first IGBT drive module and the second IGBT drive module
Source terminal is connected, and the drain electrode end of the second IGBT drive module is connected with power cathode；The grid of third IGBT drive module
End is connected with the source terminal of the drain electrode end of the first IGBT drive module, the second IGBT drive module respectively；3rd IGBT driving
The source terminal of module is connected with positive pole；The drain electrode end of third IGBT drive module is connected with power cathode.
It is further preferred that further including having: the current-limiting resistance of positive pole outlet side is arranged in；The electricity of the current-limiting resistance
Resistance value is 4.4k Ω.
It is further preferred that further including having: the input of the first phototriode is arranged in extremely between positive pole
Second protecting against shock two pole of the input of the second phototriode extremely between positive pole is arranged in first protecting against shock diode
Pipe；
Wherein, the positive terminal of the first protecting against shock diode is connected with positive pole, the cathode of the first protecting against shock diode
End is extremely connected with the input of the first phototriode；The positive terminal of second protecting against shock diode and the first protecting against shock diode
Negative pole end be connected, the negative pole end of the second protecting against shock diode is extremely connected with the input of the second phototriode.
Selectable, the input side of third IGBT drive module gate terminal is additionally provided with overvoltage protection resistance；The over-voltage
The resistance value of protective resistance is not less than 40 Ω.
Selectable, the output end side of comparison amplifier is additionally provided with Current Limiting Diodes.
And another aspect of the present invention, a kind of three-phase transformer, the three-phase transformer are weighed equipped with claim 1-
Benefit require 5 described in on-load voltage regulation driving switch circuit.
The present invention provides a kind of on-load voltage regulation driving switch circuit and application the switching circuit three-phase transformer,
In include the first photo-coupler, the second photo-coupler, comparison amplifier, the first IGBT in the on-load voltage regulation driving switch circuit
The structural units such as drive module, the second IGBT drive module, third IGBT drive module.There is load to adjust with above structure unit
The three-phase transformer of driving switch circuit and the application switching circuit is pressed, which can realize to three
The on-load voltage regulation of phase transformer works, simple structure, high reliability, have be swift in response, adjustment speed is fast, switching is without electric arc etc.
Advantage is, it can be achieved that adjustment to output voltage values, thus to realize voltage stabilization, administering power distribution network low-voltage and improving power supply
Quality provides help.
Detailed description of the invention
Fig. 1 is the circuit diagram of on-load voltage regulation driving switch circuit provided by the invention；
Fig. 2 is the circuit diagram of the three-phase transformer of the application switching circuit provided by the invention；
Appended drawing reference: 1, the first photo-coupler；2, the second photo-coupler；3, comparison amplifier；4, the first IGBT drives mould
Block；5, the second IGBT drive module；6, third IGBT drive module；Rcc: power supply；R0: current-limiting resistance；D1: the first protecting against shock two
Pole pipe；D2: the second protecting against shock diode；D3: Current Limiting Diodes；R1: overvoltage protection resistance.
Specific embodiment
The present invention provides the three-phase transformers of a kind of on-load voltage regulation driving switch circuit and the application switching circuit, should
On-load voltage regulation driving switch circuit can realize the on-load voltage regulation to three-phase transformer, have be swift in response, adjustment speed is fast, switching
The advantages that without electric arc, can provide help for the stability and output power quality for improving distribution system output voltage.
The present invention provides a kind of on-load voltage regulation driving switch circuits, as shown in Figure 1, the on-load voltage regulation driving switch circuit
The first photo-coupler, the second photo-coupler, comparison amplifier, the first IGBT drive module, the 2nd IGBT driving are specifically included
Module, third IGBT drive module.Wherein, the first photo-coupler is made of the first light emitting diode, the first phototriode, the
Two photo-couplers are made of the second light emitting diode, the second phototriode.First light emitting diode is for receiving the first driving
Control signal, extremely mutually adjoining with the emission side of the first light emitting diode, the first phototriode of control of the first phototriode
The input of pipe is extremely connected with positive pole；Second light emitting diode is for receiving the second driving control signal, the second photoelectricity
The control of triode is extremely mutually adjoining with the emission side of the second light emitting diode, and the input of the second phototriode is extremely and power supply
Anode (symbol Rcc；Wherein, the power supply preferably+12V/+20V) it is connected；The output of first phototriode is extremely compared with
The first input end of amplifier is connected, and the output of the second phototriode is extremely connected with the second input terminal of comparison amplifier
It connects；The output end of the comparison amplifier gate terminal with the gate terminal of the first IGBT drive module, the second IGBT drive module respectively
It is connected；The source terminal of first IGBT drive module is connected with positive pole, the drain electrode end of the first IGBT drive module and
The source terminal of two IGBT drive modules is connected, and the drain electrode end of the second IGBT drive module is connected with power cathode；Third
The gate terminal of the IGBT drive module source terminal phase with the drain electrode end of the first IGBT drive module, the second IGBT drive module respectively
Connection；The source terminal of third IGBT drive module is connected with positive pole；The drain electrode end and power supply of third IGBT drive module
Cathode is connected.
For convenient for those skilled in the art understand that the content of present invention, further combined with attached drawing to this on-load voltage regulation driving switch
The working method of circuit is once described in detail.This on-load voltage regulation driving switch circuit uses optical fiber triggering mode first,
The first driving control signal and the second driving control signal are received by the first photo-coupler, the second photo-coupler respectively.Wherein,
First driving control signal, the second driving control signal can be generated further by single-chip microcontroller or other control modules.
After the completion of one photo-coupler, the second photo-coupler receive the first driving control signal, the second driving control signal and photoelectric conversion,
First driving control signal is extremely fed through the of comparison amplifier through the output of the first phototriode in the first photo-coupler
One input terminal, the second driving control signal are extremely fed through to compare and put through the output of the second phototriode in the second photo-coupler
Second input terminal of big device is compared and enlarged processing, and drives letter by the triggering of comparison amplifier production subsequent drive IGBT
Number.It is worth noting that, those skilled in the art completely can be according to the reality for the common knowledge and three-phase transformer that it is grasped
Need of work, determine the first driving control signal, the second driving control signal, triggering driving signal three between association, lift
For example: assuming that the first driving control signal is 0 value optical signal, the second driving control signal is 1 value optical signal, at this time through comparing
The triggering driving signal generated after amplifier processing is to open the driving signal of subsequent IGBT.And when the first driving control signal is
1 value optical signal, the second driving control signal are 0 value optical signal, the triggering driving letter generated after comparison amplifier is handled at this time
Number for the driving signal of closing subsequent IGBT.Then, the triggering driving signal that comparison amplifier generates is loaded onto the first IGBT drive
The gate terminal of dynamic model block, the second IGBT drive module grid end position at；Wherein, the first IGBT drive module, the 2nd IGBT
Drive module forms a push-pull circuit, the ON/OFF for co- controlling third IGBT drive module.So far, load originally adjusts
Pressure driving switch circuit realizes the technical effect that IGBT switching is driven according to optical fiber trigger signal, ensure that switch ends
Always in the state of electrical isolation.
It is further used as a kind of more preferred embodiment of the invention, is additionally provided with current limliting in positive pole outlet side
The resistance value of resistance R0, current-limiting resistance R0 are preferably arranged to 4.4k Ω, for preventing the purpose of overload output current limiting；And
The input of one phototriode is extremely between positive pole, the input of the second phototriode divides extremely between positive pole
It is not provided with the first protecting against shock diode D1, the second protecting against shock diode D2, the first protecting against shock diode D1, the second protecting against shock
Diode D2 is used to protect the second photoelectricity three in the first phototriode and the second photo-coupler in the first photo-coupler
Pole pipe prevents it to be conducted to during voltage pressure stabilizing, and high-voltage breakdown influences the first phototriode, the second phototriode makes
Use the service life.And the overvoltage protection resistance R1 of the input side setting in third IGBT drive module gate terminal, overvoltage protection electricity
The resistance value for hindering R1 is not less than 40 Ω, for preventing impact of the overvoltage sharp pulse to third IGBT drive module.Finally, than
Output end side compared with amplifier is additionally provided with Current Limiting Diodes D3, and Current Limiting Diodes D3 can be used for that the first IGBT is protected to drive
Module and the second IGBT drive module.
It further, include recorded above the present invention also provides a kind of three-phase transformer, in the three-phase transformer
On-load voltage regulation driving switch circuit.For example, as shown in Fig. 2, it includes on-load voltage regulation driving switch electricity that Fig. 2, which provides one kind,
The circuit diagram of the three-phase transformer on road.Wherein, on-load voltage regulation driving switch circuit and diode rectifier bridge work together, with
Instead of tradition machinery formula switch contacts, the purpose for realizing switching three-phase transformer tap (specially increases or decreases effective winding
The number of turns), the final secondary adjustment realized to output voltage reaches the technical effect of pressure stabilizing within the specified scope.It can be with
Understand, three-phase transformer circuit shown in the Fig. 2 is only example, and those skilled in the art completely can be according to real work need
Will the specific structure to three-phase transformer further adjusted, this will not be repeated here.
The present invention provides a kind of on-load voltage regulation driving switch circuit and application the switching circuit three-phase transformer,
In include the first photo-coupler, the second photo-coupler, comparison amplifier, the first IGBT in the on-load voltage regulation driving switch circuit
The structural units such as drive module, the second IGBT drive module, third IGBT drive module.There is load to adjust with above structure unit
The three-phase transformer of driving switch circuit and the application switching circuit is pressed, which can realize to three
The on-load voltage regulation of phase transformer works, simple structure, high reliability, have be swift in response, adjustment speed is fast, switching is without electric arc etc.
Advantage is, it can be achieved that adjustment to output voltage values, thus to realize voltage stabilization, administering power distribution network low-voltage and improving power supply
Quality provides help.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (6)
1. on-load voltage regulation driving switch circuit, which is characterized in that include:
First photo-coupler, the second photo-coupler；First photo-coupler is by the first light emitting diode, the first phototriode structure
At the second photo-coupler is made of the second light emitting diode, the second phototriode；Wherein, the first light emitting diode is for connecing
The first driving control signal is received, the control of the first phototriode is extremely mutually adjoining with the emission side of the first light emitting diode, the
The input of one phototriode is extremely connected with positive pole；Second light emitting diode is for receiving the second drive control letter
Number, the second phototriode control it is extremely mutually adjoining with the emission side of the second light emitting diode, the second phototriode it is defeated
Enter and is extremely connected with positive pole；
Comparison amplifier；The output of first phototriode is extremely connected with the first input end of comparison amplifier, the second light
The output of electric triode is extremely connected with the second input terminal of comparison amplifier；
First IGBT drive module, the second IGBT drive module, third IGBT drive module；Wherein, the output of comparison amplifier
End is connected with the gate terminal of the gate terminal of the first IGBT drive module, the second IGBT drive module respectively；First IGBT driving
The source terminal of module is connected with positive pole, the source electrode of the drain electrode end of the first IGBT drive module and the second IGBT drive module
End is connected, and the drain electrode end of the second IGBT drive module is connected with power cathode；The gate terminal of third IGBT drive module point
It is not connected with the source terminal of the drain electrode end of the first IGBT drive module, the second IGBT drive module；Third IGBT drive module
Source terminal be connected with positive pole；The drain electrode end of third IGBT drive module is connected with power cathode.
2. on-load voltage regulation driving switch circuit according to claim 1, which is characterized in that further include having: being arranged in power supply
The current-limiting resistance of positive outlet side；The resistance value of the current-limiting resistance is 4.4k Ω.
3. on-load voltage regulation driving switch circuit according to claim 1, which is characterized in that further include having: being arranged first
The defeated of the second phototriode is arranged in the first protecting against shock diode of phototriode inputted extremely between positive pole
Enter the second protecting against shock diode extremely between positive pole；
Wherein, the positive terminal of the first protecting against shock diode is connected with positive pole, the negative pole end of the first protecting against shock diode with
The input of first phototriode is extremely connected；The positive terminal of second protecting against shock diode and the first protecting against shock diode it is negative
Extremely it is connected, the negative pole end of the second protecting against shock diode is extremely connected with the input of the second phototriode.
4. on-load voltage regulation driving switch circuit according to claim 1, which is characterized in that third IGBT drive module grid
The input side at end is additionally provided with overvoltage protection resistance；The resistance value of the overvoltage protection resistance is not less than 40 Ω.
5. on-load voltage regulation driving switch circuit according to claim 1, which is characterized in that the output end one of comparison amplifier
Side is additionally provided with Current Limiting Diodes.
6. a kind of three-phase transformer, which is characterized in that the three-phase transformer is equipped with described in claim 1- claim 5
On-load voltage regulation driving switch circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910921508.8A CN110534323A (en) | 2019-09-27 | 2019-09-27 | The three-phase transformer of on-load voltage regulation driving switch circuit and the application switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910921508.8A CN110534323A (en) | 2019-09-27 | 2019-09-27 | The three-phase transformer of on-load voltage regulation driving switch circuit and the application switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110534323A true CN110534323A (en) | 2019-12-03 |
Family
ID=68670447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910921508.8A Pending CN110534323A (en) | 2019-09-27 | 2019-09-27 | The three-phase transformer of on-load voltage regulation driving switch circuit and the application switching circuit |
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|---|---|---|---|---|
| US5140591A (en) * | 1988-12-15 | 1992-08-18 | Sgs-Thomson Microelectronics S.R.L. | Generator of drive signals for transistors connected in a half-bridge configuration |
| CN1531176A (en) * | 2003-03-15 | 2004-09-22 | 鸿富锦精密工业（深圳）有限公司 | Current driver |
| CN202059318U (en) * | 2011-04-26 | 2011-11-30 | 刘闯 | Isolated bridge type high-frequency MOSFET (Metal-Oxide -Semiconductor Field Effect Transistor) drive circuit |
| CN203278779U (en) * | 2013-05-14 | 2013-11-06 | 美的集团股份有限公司 | Drive circuit of switching element |
| CN204046407U (en) * | 2014-05-06 | 2014-12-24 | 西安西驰电能技术有限公司 | A kind of many level IGBT drive circuit |
| CN204906194U (en) * | 2015-08-26 | 2015-12-23 | 南方电网科学研究院有限责任公司 | Distribution transformer's on -load voltage regulation device |
| CN106856320A (en) * | 2015-12-09 | 2017-06-16 | 青岛中石大蓝天石油技术有限公司 | A kind of oil well terminal voltage protection circuit |
| CN107306127A (en) * | 2016-04-19 | 2017-10-31 | 株式会社电装 | Drive circuit and power conversion system for switch element |
| CN109410878A (en) * | 2018-12-18 | 2019-03-01 | 惠科股份有限公司 | A kind of driving circuit, driving device and display device |
| CN210325492U (en) * | 2019-09-27 | 2020-04-14 | 中国石化集团胜利石油管理局有限公司电力分公司 | On-load voltage regulation driving switch circuit and three-phase transformer using same |
-
2019
- 2019-09-27 CN CN201910921508.8A patent/CN110534323A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5140591A (en) * | 1988-12-15 | 1992-08-18 | Sgs-Thomson Microelectronics S.R.L. | Generator of drive signals for transistors connected in a half-bridge configuration |
| CN1531176A (en) * | 2003-03-15 | 2004-09-22 | 鸿富锦精密工业（深圳）有限公司 | Current driver |
| CN202059318U (en) * | 2011-04-26 | 2011-11-30 | 刘闯 | Isolated bridge type high-frequency MOSFET (Metal-Oxide -Semiconductor Field Effect Transistor) drive circuit |
| CN203278779U (en) * | 2013-05-14 | 2013-11-06 | 美的集团股份有限公司 | Drive circuit of switching element |
| CN204046407U (en) * | 2014-05-06 | 2014-12-24 | 西安西驰电能技术有限公司 | A kind of many level IGBT drive circuit |
| CN204906194U (en) * | 2015-08-26 | 2015-12-23 | 南方电网科学研究院有限责任公司 | Distribution transformer's on -load voltage regulation device |
| CN106856320A (en) * | 2015-12-09 | 2017-06-16 | 青岛中石大蓝天石油技术有限公司 | A kind of oil well terminal voltage protection circuit |
| CN107306127A (en) * | 2016-04-19 | 2017-10-31 | 株式会社电装 | Drive circuit and power conversion system for switch element |
| CN109410878A (en) * | 2018-12-18 | 2019-03-01 | 惠科股份有限公司 | A kind of driving circuit, driving device and display device |
| CN210325492U (en) * | 2019-09-27 | 2020-04-14 | 中国石化集团胜利石油管理局有限公司电力分公司 | On-load voltage regulation driving switch circuit and three-phase transformer using same |
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