Synchronization circuit for a blocking oscillator

Details Synchronization circuit for a blocking oscillator Synchronization circuit for a blocking oscillator

1987-05-20

1989-03-14

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 56, 363 97, H02M 3335

Patent

active

048129593

ABSTRACT:
A non-interfering power supply includes a free-running blocking oscillator power supply subsystem and a circuit arrangement that synchronizes the blocking oscillator power supply subsystem to operate at the horizontal operating frequency of a display subsystem. Synchronizing signals representative of the horizontal operating frequency of the display subsystem are generated and are used to activate the circuit arrangement that causes the blocking oscillator to change its mode of operation from free-running to a fully reset fixed frequency flyback converter. When activated, a switch in the circuit arrangement extends the off-time of a switching transistor in the blocking oscillator power supply control circuit. As a result, the oscillator is forced to run at an operating frequency lower than its free-running frequency.

REFERENCES:
patent: 4073003 (1978-02-01), Chambers
patent: 4073004 (1978-02-01), Chambers et al.
patent: 4253117 (1981-02-01), Kadlec
patent: 4263615 (1981-04-01), Steinmetz et al.
patent: 4323961 (1982-04-01), Josephson
patent: 4326244 (1982-04-01), Josephson
patent: 4327404 (1982-04-01), Horiguchi
patent: 4510563 (1985-04-01), Sato
patent: 4525674 (1985-06-01), Kammiller
patent: 4682266 (1987-07-01), Huynn et al.

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