Equal pulse width modulation compensation dimming method

A technology of equal pulse width and dimming, used in light sources, electric light sources, lighting devices, etc., it can solve the problems of large harmonics and low circuit efficiency, and achieve the effect of high output power, high circuit efficiency and easy connection.

Inactive Publication Date: 2014-05-21
深圳市帕瓦科技有限公司
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Problems solved by technology

The disadvantages of this method are low ...

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  • Equal pulse width modulation compensation dimming method

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0015] In the accompanying drawings, voltage sampling 1 and current sampling 2 respectively detect the output voltage and output current; after being rectified, filtered, and calibrated by the signal adjustment circuit 3, they are input to the A / D converter, converted into digital signals and input to the microcontroller ( MCU), the microcontroller compares and judges the output voltage and output current value detected from the A / D converter according to the dimming setting command from the bus or the dimming setting circuit command from this circuit, and gives The appropriate output command drives the IGBT V1-V4 of the H-bridge circuit, and the 100Hz sine wave pulse half-wave demodulated by the full-wave rectifier bridge Z1-Z4 is rectified and applied to the H-bridge equal pulse width signal, and the switching tube V1 The middle point of the two bridg...

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Abstract

The invention discloses an equal pulse width modulation compensation dimming method. A bridge type chopper circuit, an output transformer, a bridge type rectifying power supply, an alternating-current filter, a voltage/current sampling circuit, an A/D (Analog to Digital) converter, a microcontroller, an MOSFET (Metal-Oxide -Semiconductor Field Effect Transistor) or IGBT (Insulated Gate Bipolar Translator) driving circuit, a dimming setting circuit, a state display circuit, an emergency straight-through control circuit and a bus interface circuit are provided. An equal pulse width modulation signal is synthesized by using the hardware and software of the microcontroller to drive the bridge type chopper circuit, and variable voltage having a sinusoidal wave envelope line is generated at the middle point of a bridge arm, and is applied to a load after being superposed with input voltage through an output transformer in order to adjust output voltage and the brightness of an illuminating light source.

Description

technical field [0001] The invention relates to an equal pulse width modulation compensation type dimming method of an illumination light source. Background technique [0002] At present, the commonly used dimming method at home and abroad mainly adopts the thyristor dimming method. It changes the conduction angle of the bidirectional thyristor (or antiparallel connection of two unidirectional thyristors), changes the average value of the output voltage, and applies it to the light source. Thereby adjusting the brightness of the light source. The disadvantages of this method are low circuit efficiency and large amount of harmonics. Contents of the invention [0003] The invention overcomes the disadvantages of the prior art, and provides a dimming method capable of adjusting the brightness of the lighting source, having high circuit efficiency and almost no harmonics. [0004] The technical solution adopted in the present invention is that the circuit includes a main ci...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 刘志勇
Owner 深圳市帕瓦科技有限公司
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