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Single Chip Microcomputer Control SCR Dimming No Flicker Circuit
Release time:
2024-03-12
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Single chip microcomputer controls thyristor dimming, which is a rather troublesome thing.
Single chip microcomputer controls thyristor dimming, which is a rather troublesome thing. At first, zero detection was not added. As a result, no matter how high the pwm frequency was, it flashed very quickly. After using the following one, it did not flash. In the 51hei microcontroller development board test success. If dimming is required, the moc3063 is not allowed. The 3063 is turned on by zero-crossing. The control result of AC power supply can only be half-wave, not chopping. Usually dimming is required. If voltage regulation is required, 3052 is used to cooperate with AC zero-crossing signal hardware. Transformer diodes can also be used as zero detection circuits. The edge of the zero-crossing signal triggers the interruption. After the zero-crossing, the control signal is output to the optical coupler with a delay to turn on the thyristor. Before the zero-crossing, the edge turns off the control signal to turn off the thyristor naturally. A half-wave chopping control is completed. The output voltage can be adjusted by adjusting the delay value. Of course, the delay value has a corresponding value range according to the power frequency and timer frequency division ratio, generally, an external interrupt can be used to trigger the zero-crossing edge, one edge (as to which edge is related to the hardware structure of the zero-crossing signal) is responsible for turning off the SCR, one edge is responsible for delay calculation, and is written into the timer, which is interrupted by the timer to turn on the SCR.
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