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:
Mar. 14, 2000
Filed:
Mar. 22, 1999
Tadahiko Matsumoto, Yokohama, JP;
Eito Moromizato, Machida, JP;
Abstract
A DC-DC converter has improved electrical characteristics, including a voltage-reduction detection circuit and a zero-voltage switching control circuit. In the voltage-reduction detection circuit, in a period when a switching device is OFF, when a drain voltage of the switching device is reduced to an input voltage level, a voltage of a connection section of registers is allowed to reach a threshold voltage level to reverse a signal outputted from a NOR gate from a higher level to a lower level. In the zero-voltage switching control circuit, the signal reduced as above is received and a signal outputted from a NOR gate is reversed to a higher level, according to which a pulse-control signal outputted from a NOR gate to the switching device is reversed to a higher level to turn on the switching device. Since the output pulse-control signal from the NOR gate controls switching operations performed by the switching device, no switching loss occurs and zero-voltage switching can be performed; accordingly, short-circuit loss also does not occur.