Patent ID: 6107698
Filing Date: 2000-08-22
Classification: G08C,H02J,H04N

Abstract:
A power supply circuit for an electric device having a main power supply circuit and a stand-by power supply circuit in the main unit of said electric device which can control turning on and off of said main power supply circuit according to the key operation on the remote controller,wherein said remote controller comprises:operation keys;means for generating an electromagnetic wave and transmitting it to said main unit;means for generating a remote control signal containing a first signal to turn on said main power supply circuit and transmitting it to the main unit; andfirst control means for providing instruction for the emission of said electromagnetic wave corresponding to the operation of a certain key among said operation keys and providing instruction for the transmission of said first signal after the emission of said electromagnetic wave; andwherein said main unit comprises:a main power supply circuit for supplying the power to a first load circuit required for ordinary operation during ordinary operation based on the commercial AC power source;receiving means for receiving said remote control signal from said remote controller;second control means to which the remote control signal received by said receiving means is supplied and which controls the main unit in response to the remote control signal;a first power supply for receiving the electromagnetic wave from said remote controller, converting the received electromagnetic wave to the electric energy and generating the DC voltage;a second power supply serving as a stand-by power supply circuit for supplying the power to a second load circuit (including at least said second control means and said receiving means) required for stand-by operation during stand-by status;first switching means provided between said second power supply and said second load circuit to turn on and off the connection between said second power supply and said second load circuit corresponding to whether or not the DC voltage is received from said first power supply; andsecond switching means for turning on and off the power supply from said commercial AC power source to said main power supply circuit which, under the control by said second control means, makes switch operations corresponding to the remote control signal received by said receiving means.