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.
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[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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