POWER ON/OFF CIRCUIT WITH LOCK FUNCTION

摘要

A power on/off circuit with lock function having a momentary type main switch (10), a two-circuit two-contact lock switch (11), a switching state holding circuit (17), a load (23, 25) and a power supply (24). One of the switching circuits in the lock switch (11) is connected between the main switch (10) and the input terminal (CK) of the switching state holding circuit (17). The other switching circuit in the lock switch (11) is connected between the main switch (10) and the reset terminal (CLR) of the switching state holding circuit (17). The switching state of the main switch is held by the switching state holding circuit, and the state is kept unless a reset signal is given to the switching state holding circuit. The lock switch has the only function to generate the reset signal, so that the lock switch does not cut off the supply of current to the load as in a conventional shaver.