Switched-mode power supply with delay network to reduce switchin

Details Switched-mode power supply with delay network to reduce switchin Switched-mode power supply with delay network to reduce switchin

1986-07-30

1987-09-15

Salce, Patrick R.

Electric power conversion systems

Current conversion

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

363 18, H02M 3335

Patent

active

046943854

ABSTRACT:
A switched-mode power supply circuit for converting a d.c. input voltage into a d.c. output voltage. The circuit includes a controllable power switch (Tr1) connected in series with the primary winding (L1) of a transformer (T). This winding forms part of a resonant circuit. To reduce the power losses caused by turning on the switch, the drive path of the switch incorporates a delay network (R11, C9) for each time delaying the turn-on until an instant which is substantially half a cycle of the resonance frequency later than the initial instant of the decrease of the voltage across the switch during its previous cut-off time.

REFERENCES:
patent: 4183080 (1980-01-01), Liebman
patent: 4276586 (1981-06-01), Boekhorst
patent: 4438485 (1984-03-01), Voigt
patent: 4486822 (1984-12-01), Marinus
patent: 4488210 (1984-12-01), Shono

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