Off-line switching mode power supply

Details Off-line switching mode power supply Off-line switching mode power supply

1984-04-16

1986-04-29

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 98, H02M 3335

Patent

active

045861196

ABSTRACT:
An off-power line switching mode power supply which employs current and voltage feedback and sensing converts primary rectified, unregulated high voltage to a number of regulated d.c. secondary voltages and a low frequency, high voltage output suitable for enabling ringing of standard telephones. Two high voltage field effect transistors connected in the half-bridge configuration power multiple output circuits via a capacitively coupled transformer. A pulse width modulator controls the high frequency switching times of the field effect transistors via a transformer-coupled drive circuit.

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patent: 3551777 (1970-12-01), Bingley
patent: 4144463 (1979-03-01), Sugiura
patent: 4217632 (1980-08-01), Bardos et al.
patent: 4274133 (1981-06-01), Cuk et al.
patent: 4322817 (1982-03-01), Kuster
patent: 4410935 (1983-10-01), Dang
patent: 4453193 (1984-06-01), Huang et al.
patent: 4502104 (1985-02-01), Mitchell
patent: 4525774 (1985-06-01), Kino et al.
"System 3100M DC/DC Converter PCB (185039)", ITT Practices, Issue 1, Feb. 1983.
"System 3100M DC/AC Power Supply (185158)", ITT Practices, Issue 1, Feb. 1982.

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