Switching power source

Details Switching power source Switching power source

1991-12-10

1993-11-30

Stephan, Steven L.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 97, 323222, 323351, G05F 1614, H02M 3335

Patent

active

052671330

ABSTRACT:
A resonant type switching power source implementing zero voltage switching on the basis of the resonance between an inductor and a capacitor. A main switch is connected to the primary side of a main transformer. A pulse width control circuit generates a control signal for varying the turn-on time of the main switch until the output voltage of the secondary side of the tranformer being fed back reaches a predetermined value. A resonance capacitor is connected in parallel with the main switch. When the terminal voltage of the capacitor crosses zero potential toward the negative side, the pulse width control circuit delivers an ON command to the main switch. Alternatively, the ON control over the main switch may begin at a time a predetermined period of time later than the time for turning on the resonant circuit.

REFERENCES:
patent: 4785387 (1988-11-01), Lee et al.
patent: 4857822 (1989-08-01), Tabisz et al.
patent: 4931716 (1990-06-01), Jovanovic et al.
patent: 5066900 (1991-11-01), Bassett
patent: 5140512 (1992-08-01), O'Sullivan
patent: 5172309 (1992-12-01), De Doncker et al.

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