CN103200735B - Light-emitting diode (LED) actuator preventing LED from flickering - Google Patents
Light-emitting diode (LED) actuator preventing LED from flickering Download PDFInfo
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- CN103200735B CN103200735B CN201310072087.9A CN201310072087A CN103200735B CN 103200735 B CN103200735 B CN 103200735B CN 201310072087 A CN201310072087 A CN 201310072087A CN 103200735 B CN103200735 B CN 103200735B
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- 229910052754 neon Inorganic materials 0.000 claims abstract description 24
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000004065 semiconductor Substances 0.000 claims abstract description 12
- 239000003381 stabilizer Substances 0.000 claims description 52
- 230000001131 transforming effect Effects 0.000 claims description 42
- 238000004804 winding Methods 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 230000009466 transformation Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000035807 sensation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The invention relates to a light-emitting diode (LED) actuator preventing an LED from flickering. The LED actuator preventing the LED from flickering comprises a rectifying circuit, a filter circuit, a switch voltage transformation circuit, a pulse-width modulation (PWM) chip, a volt current condenser (VCC) power supply circuit and a feedback circuit. The LED actuator preventing the LED from flickering further comprises a starting control circuit which is used for enabling the voltage of the power supply input end of the PEM chip to be lower than the starting threshold voltage of the PWM chip when the output voltage of the filter circuit is lower than critical voltage, and the starting control circuit is also used for enabling the voltage of the power supply input end of the PWM chip to be higher than or equal to the starting threshold voltage of the PWM chip and enabling the voltage of the power supply input end of the PWM chip to be constant when the output voltage of the filter circuit is higher than or equal to the critical voltage. The starting control circuit is added between the output end of the filter circuit and the power supply input end of the PWM chip, and the flickering phenomenon of an LED module occurring when neon bulb indicator light switch components or semiconductor switch components are in a disconnecting state is effectively avoided.
Description
Technical field
The present invention relates to a kind of LED driver.
Background technology
Along with LED illumination is universal all over the world, along with the development of science and technology, the auxiliary products of LED are various in style, and two kinds of switches of its market user application terminal can affect the use of LED driver.
As shown in Figure 2, one is neon bulb indicator light switch device, and what the neon bulb lamp EN of its inside carried out indicator cock as luminous element switches on and off state; As shown in Figure 3, another kind is semiconductor switch, and its controllable silicon SCR that adopts does switching device more, and the indicator light LD of its inside switches on and off state as indicator cock.
As shown in Figure 1, existing LED driver comprises rectification circuit, filter circuit, switch transforming circuit, PWM chip, VCC power supply circuits and feedback circuit, and the output of filter circuit is connected with the power input of PWM chip.
Shown in composition graphs 1, if when the series connection of neon bulb indicator light switch device controls LED driver, concrete defect is: when switch A point gets to B point (switch makes LED driver and civil power disconnect), the loop of LED driver is N or the L(civil power exchanged)-A point-B point-neon bulb lamp EN-resistance RX-Output(exports)-LED driver rectification circuit formation loop, neon bulb lamp EN is luminous, because resistance RX resistance is very large, it is 1 megohm, electric current about the 100uA approximately flow through, LED driver can not obtain enough load capacities, circuit is open-circuit condition, but the power input VCC of the PWM chip of LED driver is the output of the filter circuit after being connected on rectification, in this case, the weak current that neon bulb indicator light switch device produces can charge to filter circuit, the enabling gate voltage limit of PWM chip may be reached within a certain period of time, so, PWM chip will be caused to work suddenly, switch transforming circuit makes LED module once bright, but, the weak current that neon bulb indicator light switch device produces is not enough to the electric energy at once supplementing filter circuit consumption, namely filter circuit be not enough to maintain PWM chip work always, switch transforming circuit energy is inadequate, LED module extinguishes again, that is, whole Circuits System is in startup---closes---startup---constantly to circulate under the state of closedown, so just there is regular LED module scintillation, uncomfortable sensation is caused to human eye.When switch is got to C point by A point (switch makes LED driver electrically connect with city), LED driver obtains enough energy work, loop is not now just through neon bulb lamp EN and resistance RX, luminous neon bulb indicator light circuit becomes off state, neon bulb lamp EN does not work, and the normal work strip of LED driver is carried.
Shown in composition graphs 1, if when semiconductor switch device series connection controls LED driver, because controllable silicon SCR has the characteristic of semiconductor, when control end C does not have drive singal, the input and output of controllable silicon SCR still have faint electric current to flow through, although this electric current can not allow the load normal foot browband of LED driver carry work, but be enough to allow the PWM chip of LED driver obtain electric starting, just as neon bulb indicator light switch device, when switch off state, LED module is in ceaselessly on and off (i.e. scintillation), very uncomfortable sensation is caused to human eye, also the life-span of light fixture is affected further.
Summary of the invention
The object of the invention is to propose a kind of LED driver preventing LED from glimmering, it can solve neon bulb indicator light switch device and semiconductor switch device when off-state, causes LED module to occur the problem of scintillation.
In order to achieve the above object, the technical solution adopted in the present invention is as follows:
A kind of LED driver preventing LED from glimmering, it comprises rectification circuit, filter circuit, switch transforming circuit, PWM chip, VCC power supply circuits, feedback circuit, the output of rectification circuit is connected with the input of filter circuit, the output of filter circuit is connected with the first input end of switch transforming circuit, the drive end of PWM chip is connected with the second input of switch transforming circuit, the power input of PWM chip is connected with VCC power supply circuits, the feedback input end of PWM chip is connected with feedback circuit, VCC power supply circuits, feedback circuit is all connected with the feedback output end of switch transforming circuit, the power supply output of switch transforming circuit is connected with a LED module, described rectification circuit is electrically connected with city by a neon bulb indicator light switch device or semiconductor switch device.It also comprises a startup control circuit, start the input of control circuit to be connected with the output of filter circuit, start the output of control circuit to be connected with the power input of PWM chip, described startup control circuit is used for when the output voltage of filter circuit is less than critical voltage, the voltage of the power input of PWM chip is made to be less than its enabling gate voltage limit, and for when the output voltage of filter circuit is more than or equal to critical voltage, the voltage of the power input of PWM chip is made to be more than or equal to its enabling gate voltage limit, and make the voltage constant of the power input of PWM chip.
Preferably, in order to consume the weak current that switching device produces when off-state further, rectification circuit and an energy clamp circuit are connected in parallel, and described energy clamp circuit is connected to neon bulb indicator light switch device or between semiconductor switch device and rectification circuit.Described energy clamping circuit comprises resistance R6, resistance R7, and resistance R6 is connected in series with resistance R7.
Optionally, described startup control circuit comprises resistance R1, resistance R2, resistance R3, resistance R4, resistance R8, resistance R9, resistance R10, voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD4, voltage-stabiliser tube ZD5, triode Q1, triode Q2, resistance R1, resistance R2, resistance R8 is connected in series, and the connected node between resistance R1 with resistance R2 is connected with the collector electrode of triode Q1 by resistance R11, and the collector electrode of triode Q1 is by voltage-stabiliser tube ZD1 ground connection, and the connected node between resistance R2 and resistance R8 is successively by voltage-stabiliser tube ZD5, resistance R9 is connected with the base stage of triode Q1, and the emitter of triode Q1 is connected with the base stage of triode Q2, and the base stage of triode Q2 passes through resistance R10 ground connection, resistance R3, resistance R4, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD4 is connected in series successively, and the emitter of triode Q2 is connected between voltage-stabiliser tube ZD2 and voltage-stabiliser tube ZD3, and voltage-stabiliser tube ZD4 is connected with the power input of PWM chip, and the collector electrode of triode Q2 is connected between voltage-stabiliser tube ZD4 and the power input of PWM chip, wherein, resistance R8 ground connection, the connected node of resistance R1 and resistance R3 is as the input starting control circuit, and the connected node of triode Q2 and voltage-stabiliser tube ZD4 is as the output starting control circuit.
Optionally, described switch transforming circuit comprises transformer T1, the RCD absorbing circuit be connected with the armature winding of transformer T1, the LED module power supply circuits be connected with the secondary winding of transformer T1; LED module power supply circuits are as the power supply output of switch transforming circuit; One end of RCD absorbing circuit is as the first input end of switch transforming circuit, and the other end of RCD absorbing circuit is as the second input of switch transforming circuit; The auxiliary winding of transformer T1 is as the feedback output end of switch transforming circuit.
Optionally, described VCC power supply circuits comprise diode D4, electric capacity C4, resistance R15, the negative pole of diode D4 is connected with the power input of PWM chip, the positive pole of diode D4 is connected with the feedback output end of switch transforming circuit, and the power input of PWM chip is respectively by electric capacity C4, resistance R15 ground connection.
Optionally, described feedback circuit comprises resistance R13, resistance R16, resistance R14, resistance R13 is connected in series formation first series arm with resistance R16, first series arm is connected with the feedback output end of switch transforming circuit, the voltage detecting end of the feedback input end of PWM chip is connected between resistance R13 and resistance R16, and the current detecting end of the feedback input end of PWM chip is by resistance R14 ground connection.
Optionally, described critical voltage is 150V.
The present invention has following beneficial effect:
Between the output and the power input of PWM chip of filter circuit, increase by one start control circuit, when effectively preventing neon bulb indicator light switch device or semiconductor switch device to be in off-state, the scintillation that LED module occurs.Owing to preventing the appearance of scintillation, thus the useful life of LED module, LED driver can be extended, and improve the reliability of LED driver.
Accompanying drawing explanation
Fig. 1 is the application schematic diagram of the LED driver of prior art;
Fig. 2 is the structural representation of the neon bulb indicator light switch device of prior art;
Fig. 3 is the structural representation of the semiconductor switch device of prior art;
Fig. 4 is the application principle schematic diagram of the LED driver preventing LED from glimmering of present pre-ferred embodiments;
Fig. 5 is the electrical block diagram of the LED driver preventing LED from glimmering of present pre-ferred embodiments.
Reference numeral: 10, energy clamp circuit; 20, rectification circuit; 30, control circuit is started; 40, switch transforming circuit; 50, RCD absorbing circuit; 60, LED module.
Embodiment
Below, by reference to the accompanying drawings and embodiment, the present invention is described further.
As shown in Figure 4, for the application circuit of the light on and off of the LED driver preventing LED from glimmering of the present embodiment and neon bulb indicator light switch devices in series formation control LED module, be described.
Prevent the LED driver that LED glimmers, it comprises energy clamp circuit, rectification circuit, filter circuit, switch transforming circuit, PWM chip, VCC power supply circuits, feedback circuit and startup control circuit.
The output of rectification circuit is connected with the input of filter circuit, the output of filter circuit is connected with the first input end of switch transforming circuit, the drive end of PWM chip is connected with the second input of switch transforming circuit, the power input of PWM chip is connected with VCC power supply circuits, the feedback input end of PWM chip is connected with feedback circuit, VCC power supply circuits, feedback circuit are all connected with the feedback output end of switch transforming circuit, and the power supply output of switch transforming circuit is connected with a LED module.
Described rectification circuit is electrically connected with city by energy clamp circuit, neon bulb indicator light switch device successively, rectification circuit and energy clamp circuit are connected in parallel, the weak current produced when described energy clamp circuit is for consuming neon bulb indicator light switch device off-state.
Start the input of control circuit to be connected with the output of filter circuit, start the output of control circuit and be connected with the power input of PWM chip.
Described startup control circuit is used for when the output voltage of filter circuit is less than critical voltage, and make the voltage of the power input of PWM chip be less than its enabling gate voltage limit, namely PWM chip does not work; And for when the output voltage of filter circuit is more than or equal to critical voltage, the voltage of the power input of PWM chip is made to be more than or equal to its enabling gate voltage limit, and make the voltage constant of the power input of PWM chip, namely PWM chip works under stable voltage environment.
As shown in Figure 5, be circuit structure that the LED driver preventing LED from glimmering of the present embodiment is concrete.The two ends (wherein one end is by fuse F1) of energy clamp circuit 10 are held with the L of civil power respectively, N holds and is connected, and described civil power is 96-265V AC.
Rectification circuit 20 is the rectifier bridge connected and composed by four diodes.
Energy clamp circuit 10 comprises resistance R6, resistance R7, and resistance R6 is connected in series with resistance R7.
Filter circuit is made up of a filter capacitor C1.
Start control circuit 30 and comprise resistance R1, resistance R2, resistance R3, resistance R4, resistance R8, resistance R9, resistance R10, voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD4, voltage-stabiliser tube ZD5, triode Q1, triode Q2, resistance R1, resistance R2, resistance R8 is connected in series, and the connected node between resistance R1 with resistance R2 is connected with the collector electrode of triode Q1 by resistance R11, and the collector electrode of triode Q1 is by voltage-stabiliser tube ZD1 ground connection, and the connected node between resistance R2 and resistance R8 is successively by voltage-stabiliser tube ZD5, resistance R9 is connected with the base stage of triode Q1, and the emitter of triode Q1 is connected with the base stage of triode Q2, and the base stage of triode Q2 passes through resistance R10 ground connection, resistance R3, resistance R4, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD4 is connected in series successively, the emitter of triode Q2 is connected between voltage-stabiliser tube ZD2 and voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD4 is connected with the power input VCC of PWM chip, and the collector electrode of triode Q2 is connected between the power input VCC of voltage-stabiliser tube ZD4 and PWM chip U1, wherein, resistance R8 ground connection, triode Q1 is NPN type triode, and triode Q2 is PNP type triode.The connected node of resistance R1 and resistance R3 is as the input starting control circuit, and namely resistance R1, resistance R3 are connected with the positive pole of filter capacitor C1, and the connected node of triode Q2 and voltage-stabiliser tube ZD4 is as the output starting control circuit.
Switch transforming circuit 40 comprises transformer T1, the RCD absorbing circuit 50 be connected with the armature winding of transformer T1, the LED module power supply circuits be connected with the secondary winding of transformer T1.LED module power supply circuits are as the power supply output of switch transforming circuit, described LED module power supply circuits comprise diode D1, electric capacity C3, resistance R12, resistance R12 and electric capacity C3 is connected in parallel formation first parallel branch, diode D1 is connected in series with the first parallel branch, and forming loop with the secondary winding of transformer T1, the two ends of resistance R12 are as the power supply output of LED module 60.One end of RCD absorbing circuit 50 is as the first input end of switch transforming circuit, and the other end of RCD absorbing circuit 50 is as the second input of switch transforming circuit; The auxiliary winding of transformer T1 is as the feedback output end of switch transforming circuit.General, RCD absorbing circuit 50 comprises electric capacity C2, resistance R5 and diode D3, electric capacity C2 and resistance R5 is connected in parallel formation second parallel branch, diode D3 is connected with the second parallel branch and forms loop with the armature winding of transformer T1, one link of electric capacity C2 and resistance R5 is as the first input end of switch transforming circuit, be connected with the positive pole of filter capacitor C1, the positive pole of diode D3 is as the second input of switch transforming circuit, and the positive pole of diode D3 is connected with the drive end DRAIN of PWM chip U1.
LED module 60 is connected in series by LED1, LED2, LED3, LED4 and forms.
VCC power supply circuits comprise diode D4, electric capacity C4, resistance R15, the negative pole of diode D4 is connected with the power input VCC of PWM chip U1, the positive pole of diode D4 is connected with the feedback output end of switch transforming circuit, and the power input VCC of PWM chip U1 is respectively by electric capacity C4, resistance R15 ground connection.
Feedback circuit comprises resistance R13, resistance R16, resistance R14, resistance R13 is connected in series formation first series arm with resistance R16, first series arm is connected with the feedback output end of switch transforming circuit, namely one end of the first series arm is connected with the positive pole of diode D4, the other end ground connection of the first series arm, the voltage detecting end FB of the feedback input end of PWM chip U1 is connected between resistance R13 and resistance R16, and the current detecting end CS of the feedback input end of PWM chip U1 is by resistance R14 ground connection.
From the particular circuit configurations of the LED driver preventing LED from glimmering of the present embodiment, the emphasis of the present embodiment improves and is add energy clamp circuit 10 and start control circuit 30.
PWM chip U1 powers by starting control circuit 30, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD4 is serially connected with owing to starting in control circuit 30, the voltage clamping exported by filter capacitor C1 is below the enabling gate voltage limit of PWM chip U1, different PWM chip U1 has different enabling gate voltage limits, only need carry out parameter designing according to the enabling gate voltage limit of PWM chip U1.
Such as, the civil power of the LED driver access of the present embodiment is 96-265V AC.Suppose that critical voltage is 150V.When neon bulb indicator light switch device is in off-state, when the voltage on filter capacitor C1 is lower than 150V, triode Q1 conducting, and make triode Q2 conducting to triode Q2 bias voltage, thus, triode Q2 by voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD4 short circuit, thus makes the voltage on electric capacity C4 maintain below the enabling gate voltage limit of PWM chip U1, and PWM chip U1 cannot obtain enough energy work; When the voltage on filter capacitor C1 is higher than 150V, because the collector electrode of triode Q1 is by a voltage-stabiliser tube ZD1 ground connection, by the voltage front wall of triode Q1 collector electrode within the scope of certain voltage, so the voltage on filter capacitor C1 is in 96-265V excursion, voltage on filter capacitor C4 all can not become, thus automatically can adapt to full voltage range input.
The present embodiment is only described for neon bulb indicator light switch device, and the present embodiment can solve the LED flicker problem that semiconductor switch device brings when disconnecting equally.
For a person skilled in the art, according to technical scheme described above and design, other various corresponding change and distortion can be made, and all these change and distortion all should belong within the protection range of the claims in the present invention.
Claims (8)
1. the LED driver preventing LED from glimmering, it comprises rectification circuit, filter circuit, switch transforming circuit, PWM chip, VCC power supply circuits, feedback circuit, the output of rectification circuit is connected with the input of filter circuit, the output of filter circuit is connected with the first input end of switch transforming circuit, the drive end of PWM chip is connected with the second input of switch transforming circuit, the power input of PWM chip is connected with VCC power supply circuits, the feedback input end of PWM chip is connected with feedback circuit, VCC power supply circuits, feedback circuit is all connected with the feedback output end of switch transforming circuit, the power supply output of switch transforming circuit is connected with a LED module, described rectification circuit is electrically connected with city by a neon bulb indicator light switch device or semiconductor switch device, it is characterized in that, also comprise a startup control circuit, start the input of control circuit to be connected with the output of filter circuit, start the output of control circuit to be connected with the power input of PWM chip, described startup control circuit is used for when the output voltage of filter circuit is less than critical voltage, the voltage of the power input of PWM chip is made to be less than its enabling gate voltage limit, and for when the output voltage of filter circuit is more than or equal to critical voltage, the voltage of the power input of PWM chip is made to be more than or equal to its enabling gate voltage limit, and make the voltage constant of the power input of PWM chip.
2. the LED driver preventing LED from glimmering as claimed in claim 1, is characterized in that, rectification circuit and an energy clamping circuit are connected in parallel, and described energy clamping circuit is connected to neon bulb indicator light switch device or between semiconductor switch device and rectification circuit.
3. the LED driver preventing LED from glimmering as claimed in claim 2, is characterized in that, described energy clamping circuit comprises resistance R6, resistance R7, and resistance R6 is connected in series with resistance R7.
4. the LED driver preventing LED from glimmering as claimed in claim 1, is characterized in that, described startup control circuit comprises resistance R1, resistance R2, resistance R3, resistance R4, resistance R8, resistance R9, resistance R10, voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD4, voltage-stabiliser tube ZD5, triode Q1, triode Q2, resistance R1, resistance R2, resistance R8 is connected in series, and the connected node between resistance R1 with resistance R2 is connected with the collector electrode of triode Q1 by resistance R11, and the collector electrode of triode Q1 is by voltage-stabiliser tube ZD1 ground connection, and the connected node between resistance R2 and resistance R8 is successively by voltage-stabiliser tube ZD5, resistance R9 is connected with the base stage of triode Q1, and the negative pole of voltage-stabiliser tube ZD5 is connected to the connected node between resistance R2 and resistance R8, and the emitter of triode Q1 is connected with the base stage of triode Q2, and the base stage of triode Q2 passes through resistance R10 ground connection, resistance R3, resistance R4, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD4 is connected in series successively, the emitter of triode Q2 is connected between the positive pole of voltage-stabiliser tube ZD2 and the negative pole of voltage-stabiliser tube ZD3, the positive pole of voltage-stabiliser tube ZD4 is connected with the power input of PWM chip, between the positive pole that the collector electrode of triode Q2 is connected to voltage-stabiliser tube ZD4 and the power input of PWM chip, wherein, resistance R8 ground connection, the connected node of resistance R1 and resistance R3 is as the input starting control circuit, and the connected node of triode Q2 and voltage-stabiliser tube ZD4 is as the output starting control circuit.
5. prevent the LED driver that LED glimmers as claimed in claim 1, it is characterized in that, described switch transforming circuit comprises transformer T1, the RCD absorbing circuit be connected with the armature winding of transformer T1, the LED module power supply circuits be connected with the secondary winding of transformer T1; LED module power supply circuits are as the power supply output of switch transforming circuit; One end of RCD absorbing circuit is as the first input end of switch transforming circuit, and the other end of RCD absorbing circuit is as the second input of switch transforming circuit; The auxiliary winding of transformer T1 is as the feedback output end of switch transforming circuit.
6. prevent the LED driver that LED glimmers as claimed in claim 1, it is characterized in that, described VCC power supply circuits comprise diode D4, electric capacity C4, resistance R15, the negative pole of diode D4 is connected with the power input of PWM chip, the positive pole of diode D4 is connected with the feedback output end of switch transforming circuit, and the power input of PWM chip is respectively by electric capacity C4, resistance R15 ground connection.
7. prevent the LED driver that LED glimmers as claimed in claim 6, it is characterized in that, described feedback circuit comprises resistance R13, resistance R16, resistance R14, resistance R13 is connected in series formation first series arm with resistance R16, first series arm is connected with the feedback output end of switch transforming circuit, namely one end of the first series arm is connected with the positive pole of diode D4, the other end ground connection of the first series arm, the voltage detecting end of the feedback input end of PWM chip is connected between resistance R13 and resistance R16, the current detecting end of the feedback input end of PWM chip is by resistance R14 ground connection.
8. the LED driver preventing LED from glimmering as described in any one of claim 1-7, is characterized in that, described critical voltage is 150V.
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| CN201310072087.9A CN103200735B (en) | 2013-03-06 | 2013-03-06 | Light-emitting diode (LED) actuator preventing LED from flickering |
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| CN201310072087.9A CN103200735B (en) | 2013-03-06 | 2013-03-06 | Light-emitting diode (LED) actuator preventing LED from flickering |
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| CN112042276A (en) * | 2018-04-27 | 2020-12-04 | 赤多尼科两合股份有限公司 | Power supply circuit, control method and electronic device |
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| CN106879120B (en) * | 2017-03-30 | 2018-08-24 | 佛山市华永泰光电科技有限公司 | Can simultaneously adjusting brightness of LED lamps and color the anti-lightning road of booting and its method |
| CN109362155A (en) * | 2018-11-19 | 2019-02-19 | 李亚焕 | A kind of device for preventing LED from flashing |
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| CN203167355U (en) * | 2013-03-06 | 2013-08-28 | 广州凯盛电子科技有限公司 | LED driver preventing LED from flickering |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112042276A (en) * | 2018-04-27 | 2020-12-04 | 赤多尼科两合股份有限公司 | Power supply circuit, control method and electronic device |
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|---|---|
| CN103200735A (en) | 2013-07-10 |
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