AC and DC power supply non-stop switching circuit using power supply coupler
Source: InternetPublisher:天天都吃好吃的 Keywords: AC and DC DC power supply coupler switching circuit Updated: 2021/04/02
This power supply is used by microcomputers and can avoid information loss accidents caused by power outages.
When the power grid fails, the photocoupler B does not conduct, the transistor VTz conducts, and the thyristor V conducts, so the backup power supply
(battery GB) supplies power to the microcomputer through the thyristor and voltage regulator.
After the mains power is restored, the indicator light (light-emitting diode) VL lights up, and the line automatically returns to the state of being powered by the mains power.
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