Overvoltage detection circuit
The schematic diagram of the over-voltage detection circuit is shown in the figure. When an overvoltage signal is generated, the varistor is broken down, showing a low resistance value
even close to a short-circuit state, so that a large current is generated on the primary side of the current transformer, and through the mutual inductance of the coil, it is generated on the secondary side
A small current is converted into a voltage signal through a precision resistor; this signal is input to the voltage comparator LM393,
The voltage comparator LM393 outputs a high level, and the control pulse 2 output by the NOT gate A controls the power circuit and disconnects the switching power supply circuit.
Turn on the backup power supply. The control pulse 1 is sent to the interrupt of the single-chip microcomputer, the single-chip control loop starts the A/D conversion, and samples the transient of overvoltage
Time value.
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