Patent ID: 6057609
Filing Date: 2000-05-02
Classification: H02J,Y02B,Y04S

Abstract:
An auxiliary power supply apparatus for an electronic appliance connected to commercial AC power, the apparatus comprising:an output connector connected to an AC plug of the electronic appliance employing commercial AC power as primary power;power-interrupt detecting means for detecting an interruption of said commercial AC power;a built-in cell for producing auxiliary power fed to said output connector in response to a detection result of said power-interrupt detecting means;load discriminating means for discriminating a first kind of electronic appliance having a transformer type power supply circuit in which a primary winding of a transformer is connected to said AC plug connected to said output connector from a second kind of electronic appliance having a switching type power supply circuit connected to the AC plug connected to said output connector;power producing means for producing power having a DC voltage substantially equal to a DC voltage produced by said switching type power supply circuit included in said second kind of electronic appliance while the electronic power is supplied from the commercial AC power;auxiliary power producing means for producing auxiliary power having a DC voltage from said built-in cell, said DC voltage being substantially equal to the DC voltage produced from said switching type power supply circuit included in said second kind of electronic appliance; andpower supply control means for selectively supplying one of said primary power and said auxiliary produced from said power producing means and said auxiliary power producing means to said second kind of electronic appliance having the switching type power supply circuit in response to outputs from said power-interrupt detecting means and said load discriminating means.