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:
Feb. 24, 2015
Filed:
May. 25, 2012
Tetsuo Kojima, Hitachinaka, JP;
Yuichiro Nozaki, Hitachinaka, JP;
Masafumi Makino, Hitachinaka, JP;
Takeshi Shinomiya, Hitachinaka, JP;
Tetsu Sugiura, Hitachinaka, JP;
Tetsuo Kojima, Hitachinaka, JP;
Yuichiro Nozaki, Hitachinaka, JP;
Masafumi Makino, Hitachinaka, JP;
Takeshi Shinomiya, Hitachinaka, JP;
Tetsu Sugiura, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Mito Engineering Co., Ltd., Ibaraki, JP;
Abstract
A DC power supply including a resonant circuit on a secondary side of a transformer suppresses a surge voltage during power recovery of diodes constituting a rectifier circuit, correctly estimates a load current from a secondary current of the transformer, and adjusts supplied power when a load is light. The DC power supply includes a DC voltage source, a converter, a transformer, a rectifier circuit, a resonant circuit composed of a resonant switch and a resonant capacitor, a filter reactor, a filter capacitor, a snubber diode, a snubber capacitor, a load, first and second voltage sensors, a current sensor, and a controller for controlling gate pulses of semiconductor devices constituting a converter and the resonant switch and a signal for adjusting operation timings of A/D converters converting the signals of these sensors.