Power converters with improved switching efficiency

Details Power converters with improved switching efficiency Power converters with improved switching efficiency

1993-03-10

1995-04-25

Stephan, Steven L.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 16, 363 20, 363 24, H02M 7537

Patent

active

054104670

ABSTRACT:
A Circuit for reversing the direction of current flow in a rectifying device of a power converter during a time interval just prior to when the rectifying device is to be rendered non-conductive is described. The current reversal substantially reduces or eliminates reverse-recovery currents in the rectifying device, which may cause short circuits and needlessly dissipates power. The circuit comprises an energy source, a magnetic storage device, and a switch for coupling the magnetic storage device to the energy source. The magnetic storage device may comprise an inductor or a transformer. The energy source may include a voltage source, the converter's input voltage, the output voltage, or a winding magnetically coupled to another magnetic storage device of the converter. The reversal circuit includes a circuit for coupling the reversing current to the rectifying device such that it partially or completely reverses the flow of current in the rectifying device.

REFERENCES:
patent: 3151287 (1964-09-01), Pintell
patent: 5162981 (1992-11-01), Lazar et al.
patent: 5173846 (1992-12-01), Smith
patent: 5173847 (1992-12-01), Suzuki
patent: 5218522 (1993-06-01), Phelps et al.
patent: 5289101 (1994-02-01), Furuta et al.
Hua, et al., "Novel Zero-Voltage-Transition PWM Converters", Proceedings of the 23rd Annual Power Electronics Specialists Conference, IEEE, Jun. 29-Jul. 3, 1992, pp. 55-61.

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