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1. (WO2014207836) INFORMATION PROCESSING APPARATUS AND POWER SUPPLY CIRCUIT

Pub. No.:    WO/2014/207836    International Application No.:    PCT/JP2013/067512
Publication Date: Thu Jan 01 00:59:59 CET 2015 International Filing Date: Thu Jun 27 01:59:59 CEST 2013
IPC: H02M 3/155
Applicants: FUJITSU LIMITED
富士通株式会社
Inventors: NAKAZAWA, Shigeaki
中澤 重晶
Title: INFORMATION PROCESSING APPARATUS AND POWER SUPPLY CIRCUIT
Abstract:
To improve power supply circuit response with respect to a change of a load current. A power supply circuit (1) has: a transformer (2) that is provided with magnetically coupled coils (2a, 2b); a non-insulated DC-DC converter (3) using the coil (2a) as a choke coil; and an interruption circuit (4) that selectively interrupts a current flowing in the coil (2b). In the cases where a reduction rate of a current flowing in the coil (2a) exceeds a predetermined threshold value, an electromotive force is generated in the coil (2b) by changing the state of the interruption circuit (4) to a current carrying state from a current interrupting state, and energy transfers from the coil (2a) to the coil (2b). As a result, current reduction is promoted in the coil (2a), and an output voltage of the DC-DC converter (3) is stabilized in a short time.