| 摘要 |
PROBLEM TO BE SOLVED: To reduce stand-by power by disposing a sub-microcomputer for a stand-by power supply at the primary side of an AC, and setting the power consumption in the main microcomputer of a set to zero. SOLUTION: An AC input is supplied through a reactance element. When remote control data is received from a remote controller, a sub-microcomputer (210, IC1) for controlling ON, OFF of a power switch through a switch drive means is disposed at the primary side. Only the sub-microcomputer is operated in stand-by. An infinitesimal AC input is obtained by utilizing the voltage drop of the element, rectified, and supplied to the sub-microcomputer. The sub- microcomputer has a function of discriminating the remote control data and a clock function for counting a predetermined time lapse in stand-by. In this case, a communication between the sub-microcomputer and the main microcomputer in the set is conducted through a photocoupler. |
