CN203691701U - Device for controlling input surge current of LED module - Google Patents
Device for controlling input surge current of LED module Download PDFInfo
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- CN203691701U CN203691701U CN201320877421.3U CN201320877421U CN203691701U CN 203691701 U CN203691701 U CN 203691701U CN 201320877421 U CN201320877421 U CN 201320877421U CN 203691701 U CN203691701 U CN 203691701U
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- 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
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- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model discloses a device for controlling an input surge current of an LED module, and is used to control a current going through the LED module. The device comprises a power supply unit and a control unit; the power supply unit supplies power to the control unit; the control unit and the LED module are connected in series; and the control unit comprises a switch element which is connected in series with the LED module, comprises a sampling circuit which is connected to the switch element, and also comprises a current limiting unit; the LED module has a rated current; the sampling circuit samples the current going through the LED module; when the current flowing through the LED module is within a rated current range, the switching element of the control unit works in a saturated conduction state; when the current flowing through the LED module is greater than the rated current range, the current limiting unit starts limiting the current according to a signal sent by the sampling circuit, so that the switching element of the control unit works in a linear amplifying state; and accordingly, the current flowing through the LED module is controlled.
Description
[technical field]
The utility model relates to a kind of control device, especially refers to a kind of control device of LED module inrush current.
[background technology]
LED light source is because its high light efficiency and long-life are more and more subject to the attention of illuminating industry.Different with conventional light source, LED light source needs Constant Direct Current to drive, and generally need between input and LED light source, add constant-current driving power supply, please refer to shown in Fig. 1, input voltage vin can be electric main input, can be also direct current input, is used to provide power to LED light source.Driving power is power conversion circuit often, and it can be Switching Power Supply, can be also linear constant current circuit, is used to provide the required direct current signal of LED light source.At the output of driving power, be often connected to output capacitance Co, output capacitance Co is mainly for filtering driving power output current ripple, suppresses the surge voltage of coming from input; LED module is mainly LED light source chip, requirement according to optics, calorifics and structure distributes, between module and driving power, need to be electrically connected by terminal or wire, driving power can be exported suitable signal to LED module like this, makes LED chip normally luminous according to design.
In actual applications, the terminal between driving power and LED module connects or wire bonds connects the situation that there will be loose contact, and this concerning constant-current driving power supply, is equivalent to load on normal condition and overload condition two states switches back and forth.Constant-current driving power supply output voltage in the time of output overloading can rise rapidly; for fear of driving power is caused to damage; driving power is generally added with output over-voltage protection; thereby output voltage control in suitable scope; simultaneously; in order not affect normal work, this over-voltage protection point need to design highlyer than normal work output voltage, has stored so too high energy on output capacitance Co.When LED module accesses again, when driving power output becomes normal load again from overload, the voltage above Co will discharge to LED module, flows through very high surge current at LED chip, finally causes LED chip to burn out.In indivedual application, often also need system to support hot line job, require under powering-off state, do not changing at any time LED module, if driving power adopts constant current output, will there are the problems referred to above, in plug LED module process, damage LED chip.
In prior art, conventionally by adding the parts of current limliting to solve the problems referred to above in LED module.In the time of LED module connecting system, if there is too high surge voltage, by current-limiting components control inputs surge current, reach the object of protection.Please refer to shown in Fig. 2, LED module has the parts of negative temperature coefficient NTC resistance as current limliting.In the time of connecting system, because NTC resistance is larger, can suppress the increase of electric current, while normally work, NTC resistance declines because heating makes resistance, does not affect normal conversion efficiency.But because changing, NTC resistance has a process more slowly, and more limited for loose contact or metering function that Quick hot-plugging rose, and NTC itself understands and generates heat, and can affect the temperature characterisitic of module.And, adopting NTC resistance current limliting, the surge current that flows into LED module can become and become greatly large with input surge voltage, can not fine setting upper current limit.
Therefore,, in order to overcome above-mentioned defect, be necessary to provide a kind of control device of improved LED module inrush current.
[utility model content]
The purpose of this utility model is to provide a kind of control device of LED module inrush current.
To achieve these goals, the utility model adopts following technical scheme: a kind of control device of LED module inrush current, for controlling the electric current through LED module, comprise power supply unit and control unit, described power supply unit is control unit power supply, described control unit is connected with described LED module, described control unit comprises the switch element of connecting with described LED module, be connected in sample circuit and the current limliting unit of described switch element, LED module has rated current, described sample circuit sampling is by the electric current of described LED module, in the time that the electric current that flows through LED module is within the scope of rated current, the switch element of described control unit works in saturation conduction operating state, in the time flowing through the electric current of LED module and be greater than rated current scope, the signal enabling current limliting that described current limliting unit provides by described sample circuit, make the switch element of described control unit work in linear magnifying state, thereby control the electric current that flows through LED module.
Preferably, the control device of described LED module inrush current also comprises vent unit, and described vent unit connects described control unit, and in the time of LED module and power drives disconnection, described vent unit is given described control unit electric discharge.
Preferably, described vent unit comprises second switch, and described second switch has first end and the second end, and described first end connects the input of described power supply unit, and described the second end connects the switch element of described control unit.
Preferably, described vent unit also comprises voltage-stabiliser tube and divider resistance, and the first end of the second switch of described vent unit is connected with the input of described power supply unit with described divider resistance by described voltage-stabiliser tube.
Preferably, described vent unit comprises resistance, and one end of described resistance connects described switch element, and the other end connects described sample circuit.
Preferably, described current limliting unit comprises the first switch and current setting unit setting, the first end of described the first switch connects described switch element, the second end connects described current setting unit setting, the 3rd end connects sample circuit, the first end connecting valve element of described sample circuit, the second end connects described the first switch, one end of described current setting unit setting connects the first end of described sample circuit, the other end connects described the first switch, the signal output current that described current setting unit setting provides by sample circuit, thus the turn-on and turn-off of described the first switch controlled.
Preferably, the signal that described current setting unit setting provides by described sample circuit is exported the electric current of different sizes and different variation tendencies.
Preferably, described current setting unit setting comprises operational amplifier, the positive pole of the input of described operational amplifier connects described sample circuit, and the negative pole of the input of described operational amplifier connects fiducial value, and the output of described operational amplifier connects described the first switch.
Preferably, described control unit also comprises voltage-stabiliser tube and electric capacity, one end of described voltage-stabiliser tube connects described switch element, the other end connects the second end of sample circuit, one end of described electric capacity connects described switch element, the other end connects the second end, described voltage-stabiliser tube and the described Capacitance parallel connection of sample circuit.
Preferably, described current setting unit setting also comprises current-limiting resistance, and described current-limiting resistance is connected between the first switch of described operational amplifier and described control unit.
Compared to prior art, the control device of the utility model LED module inrush current has following advantage: effectively prevent that LED module electric current is excessive, and stable performance.
[accompanying drawing explanation]
Fig. 1 is driving power and the LED module schematic diagram of prior art.
Fig. 2 is the schematic diagram of the control device of the LED module inrush current of prior art.
Fig. 3 is the schematic diagram of the control device of the utility model LED module inrush current.
Fig. 4 is the circuit diagram of the first embodiment of the control device of the utility model LED module inrush current.
Fig. 5 is the circuit diagram of the second embodiment of the control device of the utility model LED module inrush current.
Fig. 6 is the key point working waveform figure of the control device of the utility model LED module inrush current.
Fig. 7 is the circuit diagram of the 3rd embodiment of the control device of the utility model LED module inrush current.
[embodiment]
Please refer to shown in Fig. 3, a kind of control device 100 of LED module inrush current, comprises LED module LED 1-N, power supply unit and control unit 200.Power supply unit is that control unit 200 is powered, and control unit 200 is connected with LED module LED 1-N.Control unit 200 comprises the switch element S connecting with LED module LED 1-N, be connected in sample circuit 201 and the current limliting unit of switch element S, LED module LED 1-N has rated current, sample circuit 201 samplings are by the electric current of LED module, in the time that the electric current that flows through LED module LED 1-N is within the scope of rated current, the switch element S of control unit 200 works in saturation conduction operating state, in the time flowing through the electric current of LED module LED 1-N and be greater than rated current scope, the signal enabling current limliting that current limliting unit provides by sample circuit 201, make the switch element S of control unit 200 work in linear magnifying state, thereby control the electric current that flows through LED module LED 1-N.
One end of the control device 100 of LED module inrush current connects constant-current driving power supply, can be not excessive and cause LED module LED 1-N to damage for the electric current of controlling constant-current driving power supply input LED module LED 1-N.The control device 100 of the utility model LED module inrush current utilizes the element characteristic of switch element S, and in the time that LED module LED 1-N normally works, switch element S saturation conduction is normally worked LED module LED 1-N under the driving of driving power.And while making electric current through LED module excessive due to the hot plug between LED module LED 1-N and driving power or other reasons, current limliting unit controls switch element S, can be not excessive through the electric current of LED module LED 1-N thereby control in linear conducting state.Control unit 200 of the present utility model can connect the negative terminal of LED module LED 1-N, also can be connected in the centre of LED module LED 1-N, be arranged in the centre of any two of LED module LED 1-N LED1 to LEDN, as long as control unit 200 is not positioned at the anode of LED module LED 1-N.The control device 100 of the utility model LED module LED 1-N inrush current can Real-Time Monitoring LED module LED 1-N electric current, and can react in time according to the situation of LED module LED 1-N electric current, well control the input current of LED module LED 1-N, make can not cause because input current is excessive LED module LED 1-N to damage.
Further, the control device 100 of the utility model LED module inrush current also comprises vent unit, and vent unit one end is connected with control unit 200, and the other end is connected with sample circuit.In the time of LED module LED 1-N and power drives disconnection, vent unit is switch element S electric discharge, guarantees that switch element S is in off state, and like this, in the time that LED module LED 1-N is connected with power drives again, switch element S is control inputs electric current normally.
Particularly, please refer to shown in Fig. 4, the control device 1 of the utility model the first preferred embodiment LED module inrush current comprises LED module LED 1-N, control unit 11 and power supply unit 12.Power supply unit 12 is powered for control unit 11, and control unit 11 is connected with LED module LED 1-N.Control unit 11 comprises the switch element S connecting with LED module LED 1-N, the sample circuit 110 that is connected in switch element S and current limliting unit 112.LED module LED 1-N has rated current, sample circuit 110 samplings are by the electric current of LED module LED 1-N, in the time that the electric current that flows through LED module LED 1-N is within the scope of rated current, the switch element S of control unit 11 works in saturation conduction operating state, in the time flowing through the electric current of LED module LED 1-N and be greater than rated current scope, the signal enabling current limliting that current limliting unit 112 provides by sample circuit 110, make the switch element S of control unit 11 work in linear magnifying state, thereby control the electric current that flows through LED module LED 1-N.In the present embodiment, sample circuit 110 comprises sampling resistor Rs, switch element S is field effect transistor, power supply unit 12 comprises current-limiting resistance R3, in other embodiment, switch element S can be also the switching device of other types, and sample circuit 110 and power supply unit 12 can also increase or reduce element as required.
The current limliting unit 112 of control unit 11 comprises the first switch Q1 and current setting unit setting 113.The first end connecting valve element S of the first switch Q1, the second end connects current setting unit setting 113, the three ends and connects sample circuit 110.The first end connecting valve element S of sample circuit 110, the second end connects the first switch Q1, and one end of current setting unit setting 113 connects the first end of sample circuit 110, and the other end connects the first switch Q1.The signal output current that current setting unit setting 113 provides by sample circuit 110, thereby the turn-on and turn-off of control the first switch Q1.In the present embodiment, the first end of the first switch Q1 is collector electrode, and the second end is base stage, and the 3rd end is emitter.
The signal that current setting unit setting 113 provides by sample circuit 110 is exported the electric current of different sizes and different variation tendencies.
Current setting unit setting 113 comprises operational amplifier U1, and the positive pole of the input of operational amplifier U1 connects sample circuit 110, and the negative pole of the input of operational amplifier U1 connects fiducial value, and the output of operational amplifier U1 connects the first switch Q1.
Control unit 11 also comprises voltage-stabiliser tube Vz and capacitor C, one end connecting valve element Q1 of voltage-stabiliser tube Vz, the other end connects the second end of sample circuit 110, one end connecting valve element Q1 of capacitor C, the other end connects the second end of sample circuit 110, and voltage-stabiliser tube Vz is in parallel with capacitor C.Current setting unit setting 113 also comprises current-limiting resistance R1, and current-limiting resistance R1 is connected between the first switch Q1 of operational amplifier U1 and control unit 11.
The control device 1 of LED module inrush current also comprises vent unit 13, vent unit 13 connection control units 11, and in the time of LED module LED 1-N and power drives disconnection, vent unit 13 discharges to control unit 11.The control device 1 of LED module inrush current of the present utility model has vent unit 13, in the time of LED module LED 1-N and power drives disconnection, vent unit 13 by switch element S fast, completely electric discharge, guarantee that switch element S is in off state, like this, in the time that LED module LED 1-N is connected with power drives again, switch element S is control inputs electric current normally.
In the present embodiment, vent unit 13 comprises second switch Q2, and second switch Q2 has first end and the second end, and first end connects the input of power supply unit 12, the switch element S of the second end connection control unit 11.Second switch Q2 also comprises the 3rd end, and the 3rd end connects sample circuit 110.In the present embodiment, second switch Q2 is triode, and its first end is base stage, and the second end is emitter, and the 3rd end is collector electrode.In other embodiment, second switch Q2 can be also other switch elements.In other embodiment, the second embodiment as shown in Figure 5, vent unit 13 also can only include a resistance R b.
Vent unit 13 also comprises voltage-stabiliser tube Vz1 and divider resistance R4, R5.The first end of the second switch Q2 of vent unit 13 is connected with the input of power supply unit 12 with divider resistance R4, R5 by voltage-stabiliser tube Vz1.
In the present embodiment, the input of the gate pole of capacitor C connecting valve element S and LED module LED 1-N negative terminal, is used for the speed that the gate voltage of control switch element S rises.Voltage-stabiliser tube Vz is used for control switch element S gate pole maximum drive voltage, avoids too high voltages to damage switch element S, and practical application can as required need not.The gate voltage of the first switch Q1 control switch element S; The fiducial value of operational amplifier U1 negative terminal input is as the maximum current threshold value of setting, and anode connects the first end of sampling resistor Rs.Current-limiting resistance R1 controls the electric current that flows into the first switch Q1 base stage.Voltage-stabiliser tube Vz1, divider resistance R4, R5 and second switch Q2 composition vent unit, power supply input is carried out dividing potential drop by divider resistance R4 and R5 after voltage-stabiliser tube Vz1, conducting or the shutoff of this partial pressure value control second switch Q2, thereby the gate drive voltage of change switch element S.
Please refer to shown in Fig. 6, Fig. 6 is the key point work wave of the control device 1 of LED module inrush current.The normal working voltage module input that was added to before the t0 moment, charge to the gate pole of switch element S by LED module LED 1-N and current-limiting resistance R3, now switch element Q1 turn-offs, power supply input produces a voltage in second switch Q2 base stage after voltage-stabiliser tube Vz1 and divider resistance R4, R5 dividing potential drop, second switch Q2 base stage and emitter reverse bias, second switch Q2 turn-offs, and the also joint conference of capacitor C makes charging voltage rise with certain slope.The starting resistor that rises to switch element S at t0 moment gate voltage, switch element S is operated in linear condition, and in LED module LED 1-N loop, electric current starts to rise.In the t1 moment, electric current in LED module LED 1-N loop reaches the output-current rating of driving power, the threshold value that this load current value is set than operational amplifier U1 is low, although the gate voltage of switch element S continues to rise, until switch element S saturation conduction, but the electric current in LED module LED 1-N loop remains on load current value.Power supply input voltage drops to a stationary value, but still higher than voltage-stabiliser tube Vz1 voltage, second switch Q2 base stage and emitter reverse bias keep turn-offing.LED module LED 1-N disconnected in t2 moment and driving power, loop current reduces to zero immediately, LED module LED 1-N input voltage drops to LED module LED 1-N cut-in voltage series connection sum, power supply input voltage declines, lower than voltage-stabiliser tube Vz1 magnitude of voltage, second switch Q2 base stage and emitter forward, second switch Q2 conducting, switch element S gate voltage is dragged down rapidly, and switch element S transfers off state to from saturation conduction.And at t4 moment LED module LED 1-N connecting system again, now driving power is exported in overvoltage protection level, make LED module LED 1-N input voltage higher than normal voltage, under this too high voltage input, in the time that switch element S gate voltage rises to certain value, as in the t5 moment, LED module LED 1-N loop current can arrive the threshold value that operational amplifier U1 sets, at this time operational amplifier U1 carries out closed-loop control, export suitable voltage and adjust the work of the first switch Q1, make switch element S be operated in linear constant current state, the electric current in module loop of flowing through so is just controlled in the threshold value that operational amplifier U1 sets.Power supply input voltage raises along with the rising of module input voltage, second switch Q2 base stage and emitter reverse bias, and second switch Q2 turns to cut-off from conducting.Driving power output capacitance (not shown) is by linear electric discharge, voltage linear declines, drop to normal working voltage value in the t6 moment, LED module LED 1-N loop current is the corresponding specified output valve of driving power that drops to also, operational amplifier U1 output low level, the first switch Q1 turn-offs, switch element S saturation conduction.The control device 1 of the utility model LED module inrush current can effectively be controlled the electric current through LED module LED 1-N, thereby has controlled the inrush current of LED module LED 1-N, and protection LED module LED 1-N can be not damaged.
In other embodiment, the power supply unit of the control device of the utility model LED module inrush current can also be linear power supply.Please refer to shown in Fig. 7, the control device 2 of the utility model the 3rd preferred embodiment LED module inrush current, other parts of this control device 2 are identical with the control device 1 of the LED module inrush current in the first embodiment, except power supply unit 22.The power supply unit 22 of the control device 2 of the LED module inrush current in the 3rd embodiment comprises the 3rd switch Q3, resistance R 6, current-limiting resistance R3 and voltage-stabiliser tube Vz2.The 3rd switch Q3 is linear switch, is used for adjusting output voltage, and voltage-stabiliser tube Vz2 is linear power supply Voltage Reference, and resistance R 6 provides direct current biasing for voltage-stabiliser tube Vz2, and current-limiting resistance R3 is switch element S gate pole charging resistor.In the present embodiment, the 3rd switch Q3 is triode.In the time that power supply input voltage is higher than voltage-stabiliser tube Vz2, the output voltage of power supply unit 22 is the difference of voltage-stabiliser tube Vz2 voltage and the 3rd switch Q3 base voltage Vbe.Wherein voltage Vbe is the 3rd switch Q3 base stage and emitter forward voltage drop.In the time that power supply input voltage is lower than the voltage of voltage-stabiliser tube Vz2, the output voltage of power supply unit 22 is about the difference of power supply input voltage and the 3rd switch Q3 base voltage Vbe.The benefit that uses linear power supply is that the output area of power supply circuits can be dwindled greatly, is conducive to calculating and selection, Optimal performance and the power consumption of design parameter.
Should be noted that, embodiment of the present utility model has preferably implementation, and not the utility model is done to any type of restriction, any person skilled in art of being familiar with may utilize the technology contents of above-mentioned announcement to change or be modified to the effective embodiment being equal to, in every case do not depart from the content of technical solutions of the utility model, any modification or equivalent variations and the modification above embodiment done according to technical spirit of the present utility model, all still belong in the scope of technical solutions of the utility model.
Claims (10)
1. the control device of a LED module inrush current, for controlling the electric current through LED module, it is characterized in that: it comprises power supply unit and control unit, described power supply unit is control unit power supply, described control unit is connected with described LED module, described control unit comprises the switch element of connecting with described LED module, be connected in sample circuit and the current limliting unit of described switch element, LED module has rated current, described sample circuit sampling is by the electric current of described LED module, in the time that the electric current that flows through LED module is within the scope of rated current, the switch element of described control unit works in saturation conduction operating state, in the time flowing through the electric current of LED module and be greater than rated current scope, the signal enabling current limliting that described current limliting unit provides by described sample circuit, make the switch element of described control unit work in linear magnifying state, thereby control the electric current that flows through LED module.
2. the control device of LED module inrush current as claimed in claim 1, it is characterized in that: it also comprises vent unit, described vent unit connects described control unit, and in the time of LED module and power drives disconnection, described vent unit is given described control unit electric discharge.
3. the control device of LED module inrush current as claimed in claim 2, it is characterized in that: described vent unit comprises second switch, described second switch has first end and the second end, described first end connects the input of described power supply unit, and described the second end connects the switch element of described control unit.
4. the control device of LED module inrush current as claimed in claim 3, it is characterized in that: described vent unit also comprises voltage-stabiliser tube and divider resistance, the first end of the second switch of described vent unit is connected with the input of described power supply unit with described divider resistance by described voltage-stabiliser tube.
5. the control device of LED module inrush current as claimed in claim 4, is characterized in that: described vent unit comprises resistance, one end of described resistance connects described switch element, and the other end connects described sample circuit.
6. the control device of LED module inrush current as claimed in claim 1, it is characterized in that: described current limliting unit comprises the first switch and current setting unit setting, the first end of described the first switch connects described switch element, the second end connects described current setting unit setting, the 3rd end connects sample circuit, the first end connecting valve element of described sample circuit, the second end connects described the first switch, one end of described current setting unit setting connects the first end of described sample circuit, the other end connects described the first switch, the signal output current that described current setting unit setting provides by sample circuit, thereby control the turn-on and turn-off of described the first switch.
7. the control device of LED module inrush current as claimed in claim 6, is characterized in that: the signal that described current setting unit setting provides by described sample circuit is exported the electric current of different sizes and different variation tendencies.
8. the control device of LED module inrush current as claimed in claim 7, it is characterized in that: described current setting unit setting comprises operational amplifier, the positive pole of the input of described operational amplifier connects described sample circuit, the negative pole of the input of described operational amplifier connects fiducial value, and the output of described operational amplifier connects described the first switch.
9. the control device of LED module inrush current as claimed in claim 8, it is characterized in that: described control unit also comprises voltage-stabiliser tube and electric capacity, one end of described voltage-stabiliser tube connects described switch element, the other end connects the second end of sample circuit, one end of described electric capacity connects described switch element, the other end connects the second end, described voltage-stabiliser tube and the described Capacitance parallel connection of sample circuit.
10. the control device of LED module inrush current as claimed in claim 9, is characterized in that: described current setting unit setting also comprises current-limiting resistance, described current-limiting resistance is connected between the first switch of described operational amplifier and described control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320877421.3U CN203691701U (en) | 2013-12-27 | 2013-12-27 | Device for controlling input surge current of LED module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320877421.3U CN203691701U (en) | 2013-12-27 | 2013-12-27 | Device for controlling input surge current of LED module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203691701U true CN203691701U (en) | 2014-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320877421.3U Withdrawn - After Issue CN203691701U (en) | 2013-12-27 | 2013-12-27 | Device for controlling input surge current of LED module |
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| Country | Link |
|---|---|
| CN (1) | CN203691701U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104754800A (en) * | 2013-12-27 | 2015-07-01 | 欧普照明股份有限公司 | Device for controlling input surge current of LED module |
| CN111132413A (en) * | 2018-10-11 | 2020-05-08 | 茂达电子股份有限公司 | Low-surge current driving circuit and method |
-
2013
- 2013-12-27 CN CN201320877421.3U patent/CN203691701U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104754800A (en) * | 2013-12-27 | 2015-07-01 | 欧普照明股份有限公司 | Device for controlling input surge current of LED module |
| CN104754800B (en) * | 2013-12-27 | 2017-05-31 | 欧普照明股份有限公司 | A kind of control device of LED modules inrush current |
| CN111132413A (en) * | 2018-10-11 | 2020-05-08 | 茂达电子股份有限公司 | Low-surge current driving circuit and method |
| CN111132413B (en) * | 2018-10-11 | 2021-11-26 | 茂达电子股份有限公司 | Low-surge current driving circuit and method |
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