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:
May. 30, 2000
Filed:
May. 04, 1999
Ryosuke Inoshita, Kasugai, JP;
Denso Corporation, Kariya, JP;
Abstract
An inverter portion (2) includes upper main switches and lower main switches of different phases, main switching devices (3a-3f) provided in the upper main switches and the lower main switches respectively, and diodes (4a-4f) connected in antiparallel with the main switching devices (3a-3f) respectively. Bus-splitting portions (1D, 1E, 1F, 6, 7) are connected to each other at a bus-splitting junction. A resonant circuit portion (8) includes resonant reactors (9a-9c), auxiliary switches (11a-11c), and resonant capacitors (10a-10c). The resonant reactors (9a-9c) and the auxiliary switches (11a-11c) are connected in series circuits. The series circuits are connected between the bus-splitting junction and the junctions between series-coupled main switches. The resonant capacitors (10a-10c) are connected in parallel with the series circuits respectively. A gate drive portion (12) operates for turning on an auxiliary switch, which is in the series circuit connected to the junction between the series-coupled main switches of a phase to be switched, among the auxiliary switches (11a-11c). The gate drive portion (12) operates for enabling main switching devices, which are of the phase to be switched, among the main switching devices (3a-3f) to implement zero-voltage switching. The gate drive portion (12) operates for turning off the auxiliary switch in the series circuit connected to the junction between the series-coupled main switches of the phase to be switched when a current flowing through the related resonant reactor becomes substantially zero.