Low voltage latched control circuit with bi-level for improving power supply protection

The switch-type power control circuit comprises: a dual-benchmark low-voltage lock for further power protection, one input end coupled with a supply capacitor for required power, a startup resistance for the supply capacitor to charge and start the circuit, wherein if the input voltage discharges from the supply capacitor and less than the first low-voltage lock benchmark, it closes the circuit to reduce power consumption; if the input voltage less than the second lock benchmark, it starts the circuit again; during discharging, it stops circuit switch and adds discharge time.