Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1992-03-03
1993-11-16
Stephan, Steven L.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 56, 363 98, 363132, 323272, H02M 3335
Patent
active
052629325
ABSTRACT:
In one embodiment, a solid state DC power supply includes an inverter (30) having two half-bridges (32, 34) in which are provided pairs of MOSFETS (Q5-Q12) used as switching elements. An output transformer (60) and a rectifier (85) are connected to output terminals (T60). A feedback path includes switching control means (40) separate primary and secondary drive means (10, 20) supplying drive pulses to the switching means (Q5-Q12) in the inverter (30). The secondary drive means (12, 13) amplifies the pulse output of the primary drive means (11) in order to improve the switching speed of the inverter (30). Current detection is provided by a transformer (70) connected to switching (40). The primary and secondary drive means receive pulses from a pulse width modulator (IC5) the output of which is isolated by transformers (TX1, TX2). In a modification, a power converter in the form of a DC power supply includes parallel MOSFET (M) and IGBT (I) switch pairs in each arm of a full wave bridge configuration. The IGBT (I) has lower conduction loss and higher switching loss than the MOSFET (M) so that, when appropriately timed driving pulses are applied, the IGBT (I) carries current in most of a conduction period and the MOSFET (M) switches off whilst a low voltage is maintained across the IGBT (I). This reduces conduction and switching losses to a minimum.
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European Search Report dated Apr. 6, 1992.
Hexfet Databook--pp. A-20.
Data Sheets PD-6.011.
Hadjivassilev Stefan T.
Lefedjiev Adrian K.
Leisten Michael J.
Petkov Roumen D.
Stanley David L.
Davidson Ben
Stephan Steven L.
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