Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1999-05-04
2000-05-30
Nguyen, Matthew
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363132, H02M 324, H02M 75387
Patent
active
060698098
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.
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Denso Corporation
Nguyen Matthew
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