The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 01, 2002
Filed:
Jun. 21, 2000
Hitoshi Tsuji, Machida, JP;
Eito Moromizato, Machida, JP;
Abstract
A switching power supply apparatus has a transformer having a primary winding, a secondary winding and a tertiary winding; a primary switching element connected to the primary winding of the transformer for providing the primary winding with an input voltage in accordance with an on-off operation of the main switching element; an output circuit connected to the secondary winding of the transformer for receiving a voltage based on the input voltage from the secondary winding, rectifying the voltage and outputting an output voltage; a detection circuit in which the output voltage output from the output circuit is indirectly detected using the tertiary winding, and the detected voltage is output; a compensating-voltage-superposition circuit which generates a compensating voltage, in accordance with the detection voltage, for compensating a deviation of the detection voltage of the detection circuit to the output voltage of the output circuit in accordance with a change of the input voltage and which superposes the compensating voltage on the detection voltage output from the detection circuit; and a control circuit which controls the on-off operation of the primary switching element so that the output voltage of the output circuit is stabilized based on the detection voltage having the compensating voltage superposed thereon.