POWER SUPPLY CIRCUIT DEVICE

摘要

PURPOSE:To control surely a supply voltage to a load by generating a boost power supply for a drive circuit energizing a boosting circuit at first while the load is disconnected from a thermo generating element and connecting the load after a prescribed time. CONSTITUTION:An output of the thermo generating element 1 is fed to a drive circuit 2 via a contact 48 at first while no load is connected. The output appears at the 1st boosting circuit 34 via a transformer 30. When a sufficient voltage is obtained, the 1st switching circuit 35 is operated to throw the contact 48 thereby switching the input of the drive circuit 2 to the output of the 1st boosting circuit 34, the input contact 42 of a delay circuit 37 is closed to activate the 2nd switching circuit after a prescribed time and a contact 47 is closed to connect the load. In this state, the drive circuit 2 receives sufficient operating voltage from the 1st boosting circuit to control the output of the thermal power generating element 1 fed to the transformer 30.