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One of the mains undervoltage and overvoltage protection circuits
Source: InternetPublisher:张七岁 Keywords: Protection circuit overvoltage protection BSP power supply Updated: 2021/11/22
It uses triode control circuit.
When the grid voltage is normal, relay KA is closed and the load power is turned on . When the grid voltage is lower than the minimum allowable value (can
be set by the potentiometer RPz), or is higher than the maximum allowable value (can be set by the RPi), KA is released and the load
power supply can be cut off .
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