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LED drive circuit with dimming function and lamp

A technology of LED driving and driving circuit, which is applied in the direction of electric lamp circuit layout, output power conversion device, light source, etc., and can solve the problem that TRIAC dimmer cannot be directly applied.

Active Publication Date: 2010-09-15
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a driving circuit capable of dimming LEDs, so as to solve the problem that existing TRIAC dimmers cannot be directly applied to LED driving circuits to realize dimming of LEDs

Method used

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  • LED drive circuit with dimming function and lamp
  • LED drive circuit with dimming function and lamp
  • LED drive circuit with dimming function and lamp

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Embodiment Construction

[0034] In the following specific embodiments and drawings, unless otherwise emphasized, the same symbols represent the same parts.

[0035] figure 1 It is a schematic diagram of an existing LED triac (TRIAC) dimming scheme. The principle of dimming is described below. After the AC input voltage Vin passes through the TRIAC dimmer, it outputs a voltage signal 101 controlled at the conduction moment, and then passes through the rectifier module to obtain a unidirectional voltage 102, and the voltage 102 is divided to obtain a voltage 103, which is sent to the dimming signal generator to obtain A width-adjusted pulse signal (PWM signal) 104 . By adjusting the conduction moment of the TRIAC dimmer, the waveform of the input voltage 103 of the dimming signal generator is changed, and the pulse width of the output signal 104 of the dimming signal generator is adjusted accordingly, and then the power factor correction function ( The nonpowerfactorcorrection (Non-PFC for short) con...

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Abstract

The invention discloses an LED drive circuit with dimming function and a lamp. The LED drive circuit comprises a TRIAC dimmer; the TRIAC dimmer receives an alternating-current input voltage and generates a cut phase voltage signal; the cut phase voltage signal is rectified by a rectifying module and then coupled to a dimming signal generator; and a power factor correcting controller receives an output signal of the dimming signal generator, reflects a feedback signal of LED brightness, and outputs a switching control signal to control the on and off of a switching tube so as to drive an LED. The dimming of the LED is implemented by adjusting a conduction angle of the TRIAC dimmer.

Description

technical field [0001] Embodiments of the present invention relate to an LED driving circuit, in particular to a driving circuit for dimming an LED by using a Triac. Embodiments of the invention also relate to a lamp using the driving circuit. Background technique [0002] Three-terminal bidirectional thyristor (TRIAC) is a commonly used rectifier device in the field of power electronics, and its conduction in two directions can be realized through the control signal of the gate. When the TRIAC is turned on, the gate control signal loses its control effect, and when the current passing through the TRIAC is lower than the holding current, the TRIAC turns from on to off. [0003] TRIAC-based dimmers are currently widely used in dimming applications for purely resistive loads such as incandescent lamps and halogen lamps. ) Voltage adjustment to achieve the purpose of dimming. [0004] Light Emitting Diode (LED for short) has become one of the most potential alternative light...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05B33/0809H05B33/0845H02M1/42H05B45/10H05B45/382H05B45/355H05B45/385H05B45/39H05B45/375H05B45/3725H05B45/38
Inventor 邝乃兴杜磊张军明任远程
Owner CHENGDU MONOLITHIC POWER SYST
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