Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1996-09-04
1998-11-24
Wong, Peter S.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 98, 363132, H02M 545
Patent
active
058416447
ABSTRACT:
A passively clamped quasi-resonant DC link ("PCQRL") converter includes an output inverter having a plurality of switches, and a DC link between a DC power source and the output inverter. The DC link is realized by a clamp transformer having a clamp factor not higher than 1.1-1.3 and a small auxiliary inductance which is switched by a pair of auxiliary switches (driven by the same gating signal) and a pair of diodes. When the auxiliary switches are turned "ON", the DC link voltage drops to zero; and the switches of the output inverter then can be switched under zero voltage condition with no switching losses. Most of the modulation schemes, including PWM, are applicable to the DC link design.
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Chen Shaotang
Lipo Thomas A.
Bloom Leonard
Electric Power Research Institute Inc.
Jardieu Derek J.
Wong Peter S.
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