CN106714389B - A kind of LED drive device and its surging protection circuit, carrying out surge protection method - Google Patents
A kind of LED drive device and its surging protection circuit, carrying out surge protection method Download PDFInfo
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- CN106714389B CN106714389B CN201710084182.9A CN201710084182A CN106714389B CN 106714389 B CN106714389 B CN 106714389B CN 201710084182 A CN201710084182 A CN 201710084182A CN 106714389 B CN106714389 B CN 106714389B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/22—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage of short duration, e.g. lightning
-
- 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
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of LED drive device and its surging protection circuits, carrying out surge protection method, wherein the surging protection circuit of the LED drive device includes surge detection module, control module and constant-current driven module；By the voltage of surge detection module detection constant-current driven module, and according to whether detecting the corresponding control signal of surge voltage output to control module, control module is switched on or off according to the control signal control constant-current driven module, the working condition of surge real-time control constant-current driven module can be whether there is according to input voltage, in the case where not increasing system surge protective device cost, the carrying out surge protection ability of system is significantly improved.
Description
Technical field
The present invention relates to technical field of LED illumination, in particular to a kind of LED drive device and its surging protection circuit, wave
Gush means of defence.
Background technique
Surge is above the transient overvoltage of normal working voltage, brings adverse effect to electrical equipment, traditional LED shines
Bright driving circuit, as shown in Figure 1, be the Surge handling capability of raising system, it is pressure-sensitive at the ac input end of rectifier bridge one in parallel
Resistance MOV needs to be tested in the out of phase of alternating current during surge test, usually there is 0 °, and 90 °, 180 °,
270 ° of four phases, discovery can bear 9 ° and 270 ° two of surge voltage ratio in 0 ° and 180 ° two phase system in test
Phase wants high 1000V or more.
However, input line voltage is 0, and constant-current driven chip is in power down in 0 ° and 180 ° of two phase tests
State, the state that the high-voltage tube M11 of chip interior is off；In 90 ° and 270 ° of two phase tests, line voltage is inputted
For ceiling voltage, constant-current driven chip is in the state of work, and the high-voltage tube M11 of chip interior is in the state opened.With normal
It is 550V in the ceiling voltage that off state can be born for the 500V high-voltage MOS pipe applied to constant-current driven chip of rule,
But the ceiling voltage that open state can be born can be in 100V or so.Due to the difference of the two working condition, cause 0 ° and
The result of surge test has larger difference, the Surge handling capability of system under surge test and 90 ° and 270 ° of phases under 180 ° of phases
There is also biggish uncertainties.
Thus the prior art could be improved and improve.
Summary of the invention
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of LED drive device and its waves
Protection circuit, carrying out surge protection method are gushed, the work of surge real-time control constant-current driven module can be whether there is according to input voltage
State significantly improves the carrying out surge protection ability of system in the case where not increasing system surge protective device cost.
In order to achieve the above object, this invention takes following technical schemes:
A kind of surging protection circuit of LED drive device comprising surge detection module, control module and constant current drive mould
Block；By the voltage of surge detection module detection constant-current driven module, and according to whether detect the corresponding control of surge voltage output
Signal processed to control module, control module is switched on or off according to the control signal control constant-current driven module.
In the surging protection circuit of the LED drive device, the surge detection module is when detecting surge voltage
First control signal is exported, second control signal is otherwise exported.
In the surging protection circuit of the LED drive device, the control module when receiving first control signal,
Control constant-current driven module shutdown；The control module when receiving second control signal, open by control constant-current driven module.
In the surging protection circuit of the LED drive device, the control module include the first metal-oxide-semiconductor, described first
The grid of metal-oxide-semiconductor connects surge detection module, and the drain electrode of first metal-oxide-semiconductor connects constant-current driven module, first metal-oxide-semiconductor
Source electrode ground connection.
In the surging protection circuit of the LED drive device, the constant-current driven module is put including the first power supply, operation
Big device and high-voltage MOS pipe, the non-inverting input terminal of the anode connection operational amplifier of first power supply, first power supply are born
Pole ground connection；The inverting input terminal of the operational amplifier connects the source electrode of high-voltage MOS pipe, also by first resistor ground connection, described
The output end of operational amplifier connects the drain electrode of the first metal-oxide-semiconductor and the grid of high-voltage MOS pipe；The drain electrode of the high-voltage MOS pipe connects
Connect surge detection module.
In the surging protection circuit of the LED drive device, the surge detection module includes first capacitor and second
Resistance, the drain electrode of one end connection high-voltage MOS pipe of the first capacitor, the other end of the first capacitor connect the first MOS
The grid of pipe also passes through second resistance ground connection.
In the surging protection circuit of the LED drive device, the surge detection module includes the second metal-oxide-semiconductor and third
Resistance, the drain electrode of one end connection high-voltage MOS pipe of second metal-oxide-semiconductor, the grid of second metal-oxide-semiconductor connect the second metal-oxide-semiconductor
Source electrode and the first metal-oxide-semiconductor grid, also pass through 3rd resistor be grounded.
In the surging protection circuit of the LED drive device, first metal-oxide-semiconductor, the second metal-oxide-semiconductor and high-voltage MOS pipe
It is N-channel MOS pipe.
A kind of carrying out surge protection method of LED drive device comprising following steps:
A, by the voltage of surge detection module detection constant-current driven module, and according to whether surge voltage output phase is detected
The control signal answered is to control module；
B, control module being switched on or off according to the control signal control constant-current driven module.
A kind of LED drive device, including fuse, varistor and rectification mould for being rectified to input AC electricity
Block, further includes surging protection circuit as described above, and the input terminal of the rectification module connects alternating current, the rectification module
Output end surging protection circuit is connected by LED light string；The varistor is in parallel with the input terminal of rectification module, the guarantor
Dangerous silk is connected with the input terminal of rectification module.
Compared to the prior art, LED drive device provided by the invention and its surging protection circuit, carrying out surge protection method
In, the surging protection circuit of the LED drive device includes surge detection module, control module and constant-current driven module；By wave
The voltage of detection module detection constant-current driven module is gushed, and according to whether detects the corresponding control signal of surge voltage output extremely
Control module, control module are switched on or off according to the control signal control constant-current driven module, can be according to input voltage
With the presence or absence of the working condition of surge real-time control constant-current driven module, the case where not increasing system surge protective device cost
Under, significantly improve the carrying out surge protection ability of system.
Detailed description of the invention
Fig. 1 is the circuit diagram of LED illumination driving circuit in the prior art.
Fig. 2 is the schematic diagram of LED drive device provided by the invention.
Fig. 3 is the circuit diagram of the surging protection circuit first embodiment of LED drive device provided by the invention.
Fig. 4 is the circuit diagram of the surging protection circuit second embodiment of LED drive device provided by the invention.
Fig. 5 is the flow chart of the carrying out surge protection method of LED drive device provided by the invention.
Specific embodiment
Greatly in view of the uncertainty of surge test in the prior art, the disadvantages of not can guarantee the Surge handling capability of system, this hair
It is bright to be designed to provide a kind of LED drive device and its surging protection circuit, carrying out surge protection method, can be according to input voltage
No there are the working conditions of surge real-time control constant-current driven module, the case where not increasing system surge protective device cost
Under, significantly improve the carrying out surge protection ability of system.
To make the purpose of the present invention, technical solution and effect clearer, clear and definite, right as follows in conjunction with drawings and embodiments
The present invention is further described.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to
Limit the present invention.
Referring to Fig. 2, LED drive device provided by the invention includes fuse F1, varistor Rv, for handing over input
The input terminal of the rectification module 11 and surging protection circuit 12 that galvanic electricity is rectified, the rectification module 11 connects alternating current, institute
The output end for stating rectification module 11 connects surging protection circuit 12 by LED light string；The varistor Rv and rectification module 11
Input terminal it is in parallel, the fuse F1 connects with the input terminal of rectification module 11, on the basis of prior art varistor Rv
On, the stability that surging protection circuit 12 is further ensured that the system when generating surge voltage is added, its Surge handling capability is provided.
In the present embodiment, the rectification module 11 is rectifier bridge.
Specifically, the surging protection circuit 12 includes surge detection module 10, control module 20 and constant-current driven module
30, the surge detection module 10 connects constant-current driven module 30, the surge detection module 10 and perseverance by control module 20
Stream drive module 30 is also connected with LED light string, detects LED light string lower section, i.e. constant-current driven module 30 by surge detection module 10
Voltage, according to whether detecting the corresponding control signal of surge voltage output to control module 20, by control module 20 into one
Step is switched on or off according to the control signal control constant-current driven module 30, makes constant-current driven module 30 can be according to whether having
Surge event adjusts its working condition, eliminates the difference in surge test due to phase difference bring working condition, cause be
The unstable phenomenon of system Surge handling capability.
Preferably, the surge detection module 10 exports first control signal when detecting surge voltage, otherwise exports
Second control signal, such as when generating an instantaneous high pressure 500V, voltage can be fast with rectified input voltage below LED light string
Speed rises, and surge detection module 10 exports first control signal after detecting the instantaneous high pressure at this time, instantaneous not detecting
Output second signal is then kept when high pressure, the first control signal and second control signal can be believed for voltage signal or electric current
Number.
Correspondingly, when receiving first control signal, control constant-current driven module 30 turns off the control module 20；Institute
Control module 20 is stated when receiving second control signal, control constant-current driven module 30 is opened.I.e. control module 20 is according to wave
The working condition for gushing the control signal control constant-current driven module 30 of the output of detection module 10, when there are surge event, control
The shutdown of constant-current driven module 30 improves its voltage carrying capacity, when surge event is not present, then controls constant-current driven module 30
It opens, guarantees its normal work, whether there is the working condition of surge real-time control constant-current driven module 30 according to input voltage,
In the case where not increasing system surge protective device (such as varistor Rv) cost, the carrying out surge protection energy of system is significantly improved
Power.
Specifically, the control module 20 includes the grid connection surge inspection of the first metal-oxide-semiconductor M1, the first metal-oxide-semiconductor M1
Module 10 is surveyed, the drain electrode of the first metal-oxide-semiconductor M1 connects constant-current driven module 30, the source electrode ground connection of the first metal-oxide-semiconductor M1.Institute
Stating constant-current driven module 30 includes the first power supply U1, operational amplifier Q1 and high-voltage MOS pipe M0, the anode of the first power supply U1
Connect the non-inverting input terminal of operational amplifier Q1, the cathode ground connection of the first power supply U1；The reverse phase of the operational amplifier Q1
Input terminal connects the source electrode and ground of high-voltage MOS pipe M0, and the specific LED drive device further includes the first electricity for current sample
R1 is hindered, the inverting input terminal of the operational amplifier Q1 is grounded by the first resistor R1, and the operational amplifier Q1's is defeated
Outlet connects the drain electrode of the first metal-oxide-semiconductor M1 and the grid of high-voltage MOS pipe M0；The drain electrode connection surge inspection of the high-voltage MOS pipe M0
Survey module 10.
Control module 20 controls the grid signal of high-voltage MOS pipe M0 according to the output signal of surge detection module 10, works as wave
When gushing detection module 10 and detecting surge event and export first control signal, the grid of high-voltage MOS pipe M0 pulls down to ground, at this time
High-voltage MOS pipe M0 is in an off state, and constant-current driven chip is in power-down state, by taking 500V high-voltage MOS pipe M0 as an example, is turning off
The ceiling voltage that state can be born is 550V, guarantees the carrying out surge protection ability of system；And when the output of surge detection module 10 the
When two control signals, the grid of high-voltage MOS pipe M0 is controlled by operational amplifier Q1, is now in normal operating conditions, is realized
The normal work of chip in no surge event.
Further, heretofore described surge detection module 10 provides two kinds of embodiments, as shown in figure 3, first implements
In example, the surge detection module 10 includes one end connection height of first capacitor C1 and second resistance R2, the first capacitor C1
The drain electrode of metal-oxide-semiconductor M0 is pressed, the other end of the first capacitor C1 connects the grid of the first metal-oxide-semiconductor M1, also passes through second resistance
R2 ground connection.When surge event occurs, quick changes in voltage below LED light string, upper can synchronize of second resistance R2 generates one
Fast-changing voltage signal, and the grid grade of the first metal-oxide-semiconductor M1 is connected to the top of second resistance R2, the first metal-oxide-semiconductor M1 is opened at this time
It opens, high-voltage MOS pipe M0 pulled down to ground, and high-voltage MOS pipe M0 is in an off state, avoids system work as caused by surge voltage
Make abnormal.
As shown in figure 4, the surge detection module 10 includes the second metal-oxide-semiconductor M2 and 3rd resistor R3 in second embodiment,
The drain electrode of one end connection high-voltage MOS pipe M0 of the second metal-oxide-semiconductor M2, the grid of the second metal-oxide-semiconductor M2 connect the second metal-oxide-semiconductor
The grid of the source electrode of M2 and the first metal-oxide-semiconductor M1 are also grounded by 3rd resistor R3.Wherein the second metal-oxide-semiconductor M2 is high-voltage tube, tool
There are gate-drain parasitic capacitances, the parasitic capacitance and 3rd resistor R3 collectively form surge detection module 10, and use high-voltage tube can be with
Surge detection circuit, control circuit and continuous current are integrated into the same chip, improve integrated level, reduce system at
This.When surge event occurs, quick changes in voltage below lamp string, 3rd resistor R3 is upper to be synchronized generation one and quickly changes
Voltage signal, the grid grade of the first metal-oxide-semiconductor M1 is connected to the top of 3rd resistor R3, and the first metal-oxide-semiconductor M1 is opened at this time, high pressure
Metal-oxide-semiconductor M0 pulled down to ground, and high-voltage MOS pipe M0 is in an off state, has equally achieved the purpose that carrying out surge protection.
When it is implemented, the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2 and high-voltage MOS pipe M0 are N-channel MOS pipe.
Correspondingly, the present invention also provides a kind of carrying out surge protection methods of LED drive device, as shown in figure 5, the LED drives
The carrying out surge protection method of dynamic device includes the following steps:
S100, the voltage that constant-current driven module is detected by surge detection module, and according to whether detect that surge voltage is defeated
Signal is controlled accordingly out to control module；
S200, control module are switched on or off according to the control signal control constant-current driven module.
The present invention correspondingly provides a kind of surging protection circuit of LED drive device, due to anti-to the surge above
Protection circuit is described in detail, and and will not be described here in detail.
In conclusion in LED drive device provided by the invention and its surging protection circuit, carrying out surge protection method, it is described
The surging protection circuit of LED drive device includes surge detection module, control module and constant-current driven module；Mould is detected by surge
Block detects the voltage of constant-current driven module, and according to whether detects the corresponding control signal of surge voltage output to controlling mould
Whether block, control module are switched on or off according to the control signal control constant-current driven module, can be deposited according to input voltage
In the working condition of surge real-time control constant-current driven module, in the case where not increasing system surge protective device cost, show
Write the carrying out surge protection ability of raising system.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement all should belong to the guarantor of appended claims of the invention
Protect range.
Claims (4)
1. a kind of surging protection circuit of LED drive device, which is characterized in that including surge detection module, control module and perseverance
Flow drive module；By the voltage of surge detection module detection constant-current driven module, and according to whether detect that surge voltage exports
Corresponding control signal is to control module, unlatching or pass of the control module according to the control signal control constant-current driven module
It is disconnected；
The surge detection module exports first control signal when detecting surge voltage, otherwise exports second control signal；
The first control signal and second control signal are voltage signal or current signal；
The control module is when receiving first control signal, control constant-current driven module shutdown；The control module is connecing
When receiving second control signal, control constant-current driven module is opened；
The control module includes the first metal-oxide-semiconductor, and the grid of first metal-oxide-semiconductor connects surge detection module, the first MOS
The drain electrode of pipe connects constant-current driven module, the source electrode ground connection of first metal-oxide-semiconductor；
The constant-current driven module includes the first power supply, operational amplifier and high-voltage MOS pipe, the anode connection of first power supply
The non-inverting input terminal of operational amplifier, the cathode ground connection of first power supply；The inverting input terminal of the operational amplifier connects
The source electrode of high-voltage MOS pipe also passes through first resistor ground connection, the drain electrode of output end the first metal-oxide-semiconductor of connection of the operational amplifier
With the grid of high-voltage MOS pipe；The drain electrode of the high-voltage MOS pipe connects surge detection module；
The surge detection module includes the second metal-oxide-semiconductor and 3rd resistor, and one end of second metal-oxide-semiconductor connects high-voltage MOS pipe
Drain electrode, the grid of second metal-oxide-semiconductor connects the source electrode of the second metal-oxide-semiconductor and the grid of the first metal-oxide-semiconductor, also passes through 3rd resistor
Ground connection, wherein the second metal-oxide-semiconductor is the high-voltage tube with gate-drain parasitic capacitances.
2. the surging protection circuit of LED drive device according to claim 1, which is characterized in that first metal-oxide-semiconductor,
Second metal-oxide-semiconductor and high-voltage MOS pipe are N-channel MOS pipe.
3. a kind of carrying out surge protection method of LED drive device, which comprises the steps of:
A, by the voltage of surge detection module detection constant-current driven module, and according to whether detect that surge voltage output is corresponding
Signal is controlled to control module；
B, control module being switched on or off according to the control signal control constant-current driven module；
In the step A, the surge detection module exports first control signal when detecting surge voltage, otherwise exports
Two control signals；The first control signal and second control signal are voltage signal or current signal；
In the step B, the control module is when receiving first control signal, control constant-current driven module shutdown；It is described
Control module when receiving second control signal, open by control constant-current driven module；
Wherein, the control module includes the first metal-oxide-semiconductor, and the grid of first metal-oxide-semiconductor connects surge detection module, and described the
The drain electrode of one metal-oxide-semiconductor connects constant-current driven module, the source electrode ground connection of first metal-oxide-semiconductor；
The constant-current driven module includes the first power supply, operational amplifier and high-voltage MOS pipe, the anode connection of first power supply
The non-inverting input terminal of operational amplifier, the cathode ground connection of first power supply；The inverting input terminal of the operational amplifier connects
The source electrode of high-voltage MOS pipe also passes through first resistor ground connection, the drain electrode of output end the first metal-oxide-semiconductor of connection of the operational amplifier
With the grid of high-voltage MOS pipe；The drain electrode of the high-voltage MOS pipe connects surge detection module；
The surge detection module includes the second metal-oxide-semiconductor and 3rd resistor, and one end of second metal-oxide-semiconductor connects high-voltage MOS pipe
Drain electrode, the grid of second metal-oxide-semiconductor connects the source electrode of the second metal-oxide-semiconductor and the grid of the first metal-oxide-semiconductor, also passes through 3rd resistor
Ground connection, the second metal-oxide-semiconductor are the high-voltage tube with gate-drain parasitic capacitances.
4. a kind of LED drive device, including fuse, varistor and rectification mould for being rectified to input AC electricity
Block, which is characterized in that further include the surging protection circuit as described in claim 1-2 any one, the rectification module it is defeated
Enter end connection alternating current, the output end of the rectification module connects surging protection circuit by LED light string；The varistor with
The input terminal of rectification module is in parallel, and the fuse is connected with the input terminal of rectification module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710084182.9A CN106714389B (en) | 2017-02-16 | 2017-02-16 | A kind of LED drive device and its surging protection circuit, carrying out surge protection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710084182.9A CN106714389B (en) | 2017-02-16 | 2017-02-16 | A kind of LED drive device and its surging protection circuit, carrying out surge protection method |
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| CN106714389B true CN106714389B (en) | 2019-05-21 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109301792A (en) * | 2018-12-05 | 2019-02-01 | 珠海格力电器股份有限公司 | protection circuit, circuit system, automation device, control method and device |
| CN112068633B (en) * | 2020-09-02 | 2022-02-01 | 北京市科通电子继电器总厂有限公司 | Surge current protection circuit and solid state relay |
| CN114301035B (en) * | 2021-12-31 | 2024-03-22 | 上海晶丰明源半导体股份有限公司 | Surge protection circuit, driving circuit and surge protection method |
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| JP3773506B2 (en) * | 2003-07-24 | 2006-05-10 | 松下電器産業株式会社 | Semiconductor integrated circuit device |
| TWI473528B (en) * | 2011-04-11 | 2015-02-11 | Green Solution Tech Co Ltd | Led driving circuit and protecting circuit thereof |
| CN103260302B (en) * | 2013-01-14 | 2015-08-26 | 美芯晟科技（北京）有限公司 | The LED driver that a kind of ON time is adjustable |
| CN103152928A (en) * | 2013-02-20 | 2013-06-12 | 郑英贵 | Load overvoltage protection circuit and control method thereof |
| JP2016111186A (en) * | 2014-12-05 | 2016-06-20 | ソニー株式会社 | Semiconductor integrated circuit |
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| CN102132627A (en) * | 2008-08-19 | 2011-07-20 | Nxp股份有限公司 | A surge protection circuit |
| CN105811517A (en) * | 2010-03-26 | 2016-07-27 | 半导体元件工业有限责任公司 | Semiconductor integrated circuit |
| CN104218551A (en) * | 2013-05-30 | 2014-12-17 | 海洋王（东莞）照明科技有限公司 | Lamp surge protection circuit and lamp |
| CN203708551U (en) * | 2013-12-17 | 2014-07-09 | 四川新力光源股份有限公司 | LED alternating-current drive circuit |
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| CN106714389A (en) | 2017-05-24 |
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