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LED drive circuit and its control circuit suitable for thyristor dimmer

A technology of LED drive and control circuit, which can be used in the layout of electric lamp circuit, light source, electric light source, etc., and can solve the problem of high cost

Active Publication Date: 2017-10-13
HANGZHOU SILAN MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the cost of the two-stage dimming method is relatively high. Therefore, it is a work of great practical application value to study a single-stage dimming drive circuit and its control circuit with a simple structure and high performance.

Method used

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  • LED drive circuit and its control circuit suitable for thyristor dimmer
  • LED drive circuit and its control circuit suitable for thyristor dimmer
  • LED drive circuit and its control circuit suitable for thyristor dimmer

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Embodiment Construction

[0143] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0144] refer to figure 1 , the LED drive circuit applicable to the thyristor dimmer in this embodiment includes: thyristor dimmer TR1, rectifier bridge B1, first damping circuit 100, second damping circuit 200, bleeder circuit 300, input filter The circuit 400, the LED driver 500, the control circuit 1600, the switch tube Q1, the sampling resistor Rs and the output capacitor Co.

[0145] refer to figure 2 , the control circuit 1600 may include: dimming phase detection circuit 600, phase filter circuit 700, dummy load drive circuit 800, nonlinear reference circuit 900, average current loop adjustment circuit 1000, reset circuit 1100, intermittent delay circuit 1200, output A current simulation circuit 1300 , a zero-crossing detection circuit 1400 and a main driving c...

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PUM

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Abstract

The invention provides an LED drive circuit and its control circuit suitable for silicon controlled rectifier dimmers. The control circuit includes: a dimming phase detection circuit; a phase filter circuit connected with the dimming phase detection circuit; A connected nonlinear reference circuit; a zero-crossing detection circuit coupled directly or indirectly to the output of the LED drive circuit; an output current analog circuit connected to the zero-crossing detection circuit; an average circuit connected to the nonlinear reference circuit and the output current analog circuit A current loop adjustment circuit; a reset circuit connected with the average current loop adjustment circuit; an intermittent delay circuit connected with the phase filter circuit; a main drive circuit connected with the reset circuit, the intermittent delay circuit and the zero-crossing detection circuit. The invention can realize high power factor single-stage dimming, and has the characteristics of no flicker, good compatibility and the like.

Description

technical field [0001] The invention relates to LED driving technology, in particular to an LED driving circuit and a control circuit suitable for a thyristor dimmer. Background technique [0002] Compared with conventional light sources such as incandescent lamps and fluorescent lamps, LED lamps have the advantages of high efficiency, good directionality, good stability, high reliability, and long life, so they are widely used in various places. The thyristor dimming method is one of the most widely used dimming methods for LEDs at present, and it is widely used in fields such as stage lighting and ambient lighting. As we all know, due to the characteristics of the thyristor dimmer, it needs a certain maintenance current to ensure the conduction, so it cannot be directly connected in series with the live line of the LED driver, and the LED driver circuit needs to be modified accordingly. [0003] The usual solution in the prior art is to carry out two-stage dimming: that i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 谢小高叶美盼蔡拥军
Owner HANGZHOU SILAN MICROELECTRONICS
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