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:
Jan. 14, 2003
Filed:
Nov. 20, 2001
Sansha Electric Manufacturing Company, Limited, Osaka, JP;
Abstract
A DC power supply apparatus has two power supply input terminals between which one of 100 V level, 200 V level and 400 V level AC power supply voltages or a 575 V AC power supply voltage is applied. A rectifying unit is connected between the two power supply input terminals, and a voltage-lowering converter is connected to the rectifying unit. A thyristor is connected between the input and output of the voltage-lowering converter. A series combination of two capacitors is connected between two output terminals of the voltage-lowering converter. A switch circuit is connected between the junction of the two capacitors and one input terminal of the rectifying unit. An inverter converts a DC voltage appearing across the series combination of the capacitors into a high-frequency voltage, which, in turn, is voltage transformed by a transformer. The voltage-transformed high-frequency voltage is converted into a DC voltage in a high-frequency-to-DC converter for application to a load. When a 100 V level voltage is applied between the power supply input terminals, the thyristor is turned on, the voltage-lowering converter is turned off and the switch circuit is turned on. When one of the 200 V level voltages is connected, the thyristor is turned on, the voltage-lowering converter is turned off, and the switch circuit is turned off. When one of the 400 V level voltages or the 575 V voltage is applied between the power supply input terminals, the thyristor is turned off, the voltage-lowering converter is turned on, and the switch circuit is turned off.