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LED (Light Emitting Diode) drive circuit with dimming function and lamp

A technology of LED drive and drive circuit, which is applied in the direction of lamp circuit layout, light source, electric light source, etc., and can solve the problems that TRIAC dimmers cannot be directly applied.

Active Publication Date: 2013-09-18
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 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 (Light Emitting Diode) drive circuit with dimming function and lamp
  • LED (Light Emitting Diode) drive circuit with dimming function and lamp
  • LED (Light Emitting Diode) drive circuit with dimming function and lamp

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Embodiment Construction

[0035] In the following specific embodiments and drawings, unless otherwise emphasized, the same symbols represent the same parts.

[0036] 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 non power factor correction (Non-PFC for short) ...

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Abstract

The invention discloses an LED (Light Emitting Diode) drive circuit with a dimming function and a lamp. The drive circuit comprises a triode AC (Alternating Current) semiconductor switch (TRIAC) light modulator which receives alternating current input voltage, and generates a phase-cut voltage signal which is rectified through a rectifier module to be coupled to a dimming signal generator; a power factor collection controller receives the output signal of the dimming signal generator and a feedback signal reflecting the brightness of an LED; and an output switch control signal controls the on and off of a switch tube so as to realize the drive of the LED. Through adjusting the conduction angle of the TRIAC light modulator, the dimming of the LED is realized.

Description

[0001] This application is a divisional application filed on May 19, 2010, the application number is 201010176247.0, and the title of the invention is "an LED drive circuit and lamp with dimming function". technical field [0002] 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 drive circuit. Background technique [0003] 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. [0004] TRIAC-based dimmers are currently widely used in dimming applications for purely resistive load...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05B45/10H05B45/382H05B45/355H05B45/385H05B45/39H05B45/375H05B45/3725H05B45/38
Inventor 邝乃兴杜磊张军明任远程
Owner CHENGDU MONOLITHIC POWER SYST
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