PWM (Pulse-Width Modulation) modulated LED drive circuit having power-off memory function

A technology of LED driving and power-off memory, applied in the field of lighting, can solve the problems of inability to record the control state of the PWM switch module, inconvenient for users to use, etc., and achieve the effect of preventing control disorder and being easy to use.

Inactive Publication Date: 2018-08-21
EDISON OPTO (DONGGUAN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional PWM modulation LED drive circuit generally needs to use a control chip capable of modulating PWM signals. The control chip modulates PWM signals with different duty ratios to control the operation of the PWM switch module, and then outputs different levels of driving voltage. When the power i

Method used

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  • PWM (Pulse-Width Modulation) modulated LED drive circuit having power-off memory function
  • PWM (Pulse-Width Modulation) modulated LED drive circuit having power-off memory function
  • PWM (Pulse-Width Modulation) modulated LED drive circuit having power-off memory function

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Embodiment Construction

[0038] like Figure 1-Figure 6 As shown, the PWM modulation drive circuit of the present invention includes a power drive module 1 electrically connected to an external alternating current, a control chip 2 with a memory function, and a PWM switch module 3;

[0039] The control chip 2 includes a power supply terminal and an output terminal. The PWM switch module 3 includes a control terminal. The power drive module 1 is electrically connected to the power supply terminal of the control chip 2 to supply power to the control chip 2. The power drive module 1 provides external The LED load module 4 provides the drive voltage, the output end of the control chip 2 is electrically connected to the control end of the PWM switch module 3, and the control chip 2 controls the PWM switch module 3 to work according to the control signal output PWM signal and enables the PWM switch module 3 to output different level of driving voltage, the control chip 2 can record the control state of the ...

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PUM

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Abstract

The invention discloses a PWM (Pulse Width Modulation) modulated LED drive circuit having a power-off memory function. The PWM modulated LED drive circuit comprises a power drive module electrically connected with external alternating current, a control chip having a memory function, and a PWM switch module; the control chip comprises a power supply end and an output end, the PWM switch module comprises a control end, the power drive module is electrically connected with the power supply end of the control chip to supply power to the control chip, the power drive module supplies drive voltagefor an external LED loading module through the PWM switch module, the output end of the control chip is electrically connected with the control end of the PWM switch module, the control chip outputs aPWM signal to control the PWM switch module to work according to a control signal and outputs different grades of drive voltages, and the control chip records the control state of the PWM switch module before stopping power supply when the power drive module stops supplying power. The design is convenient for a user to use, and the control disorder caused by power failure is prevented.

Description

technical field [0001] The invention relates to the lighting field, in particular to an LED driving circuit using PWM modulation. Background technique [0002] The traditional PWM modulation LED drive circuit generally needs to use a control chip capable of modulating PWM signals. The control chip modulates PWM signals with different duty ratios to control the operation of the PWM switch module, and then outputs different levels of driving voltage. Sometimes, the control chip cannot record the control state of the control chip to the PWM switch module before the power failure, resulting in the need to re-output the control signal after the power failure is restored, so that the drive circuit can continue to operate, which is not convenient for users to use. Contents of the invention [0003] In order to solve the above technical problems, the object of the present invention is to provide a PWM modulation LED drive circuit with a power-off memory function. [0004] The tec...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37Y02B20/30
Inventor 林昱呈辛庆南
Owner EDISON OPTO (DONGGUAN) CO LTD
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