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Silicon controlled dimming LED drive circuit

A technology of LED driving and silicon dimming, applied in the direction of lamp circuit layout, light source, electric light source, etc., can solve the problems of lowering system reliability, temperature rise, high power consumption, etc., achieve simple and effective compatibility, and reduce driving current Effect

Active Publication Date: 2013-09-25
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] First, the power consumption of the bleeder resistor M2 and the bleeder switch R1 is high, which leads to loss of LED drive circuit efficiency and high temperature rise, reducing system reliability;
[0005] Second, the control circuit is complicated and the cost is high

Method used

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  • Silicon controlled dimming LED drive circuit
  • Silicon controlled dimming LED drive circuit
  • Silicon controlled dimming LED drive circuit

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Embodiment Construction

[0023] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] In order to solve the above-mentioned problems existing in the prior art, the present invention proposes a thyristor dimming LED drive circuit, on the one hand, the bleeder circuit is omitted, and the input current of the switching converter itself is used to provide the thyristor dimmer. Maintain current; on the one hand, the source of the power switch MOS transistor is used to drive, which greatly reduces the drive current. A simple, high-efficiency and well-compatible thyristor dimming LED driver is realized.

[0025] According to the thyristor dimming LED drive circuit of the present invention, such as figure 1 The drive mode and control mode of the existing drive circuit shown are improved. Refer to the schematic diagram of buck-boost thyristor dimming LED drive circuit figure 2 . An AC input source 201 is used as the power in...

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PUM

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Abstract

The invention discloses a silicon controlled dimming LED drive circuit which comprises an alternating power supply, a rectifier bridge and an LED load, wherein the rectifier bridge is connected with the alternating power supply, and the LED load is connected with an inductor or a transformer, a power switch MOS transistor, a low-voltage switch MOS transistor and a sampling resistor. The LED drive circuit further comprises a peak current comparator and a longest turn-on time timer, wherein the peak current comparator is used for comparing the sampling resistor with the amplitude of a reference voltage, the longest turn-on time timer is used for detecting turn-on time of the low-voltage switch MOS transistor, and the low-voltage switch MOS transistor is powered off when a voltage signal of the sampling resistor is higher than a reference voltage signal or when the turn-on time of the low-voltage switch MOS transistor reaches the time set by the longest turn-on time timer.

Description

technical field [0001] The invention relates to an LED driving circuit, in particular to an LED driving circuit and a control method for dimming by a thyristor. Background technique [0002] figure 1 It is a simplified schematic diagram of a thyristor dimming LED driving circuit in the prior art. Such as figure 1 As shown, an input AC power source 101 is connected in series with a thyristor dimmer 102 , and then connected to two input terminals of a rectifier bridge 103 . The rectifier bridge rectifies the alternating current and filters it through the capacitor C1 to generate a rectified sinusoidal voltage, and the resistor R4 and the capacitor C2 generate a low-voltage direct current to start the control chip. The transformer T1 has three windings, including a primary winding connected between the capacitor C1 and the drain of the power switch MOS transistor M1; a secondary winding connected between the freewheeling diode D1 and the secondary output capacitor C4; an aux...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05B45/37Y02B20/30Y02B20/40
Inventor 孙顺根于得水胡黎强
Owner SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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