Patent ID: 11966244
Assignee: NEC CORPORATION
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A power supply circuit comprising:
a plurality of cascade-connected Zener diodes being connected in parallel to a load to which power is supplied from a power feed line;
a switch that is on/off-controlled, is connected between the plurality of Zener diodes or in parallel to a first one Zener diode among the plurality of Zener diodes, and forms a current path by being on-controlled;
a current monitoring unit that monitors current flowing in a second one Zener diode among the plurality of Zener diodes;
a comparison unit that compares reference current with the current monitored by the current monitoring unit; and
a control unit that on/off-controls the switch, based on a result of the comparison by the comparison unit.