Isolated power supply having power switch on secondary side

Details Isolated power supply having power switch on secondary side Isolated power supply having power switch on secondary side

1995-09-13

1997-06-17

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 97, 323902, H02M 3335

Patent

active

056403127

ABSTRACT:
A power supply for a computer system having at least one energy demanding component. The power supply includes a transformer having a primary side coupled to an AC main and a secondary side coupled to an output line, a charging circuit coupled between the secondary side of the transformer and the output line, an optical switch coupled to the secondary side of the transformer and comprised of an optical transmitter and an optical receiver, a secondary side power switch coupled to the optical receiver, a pulse width modulator coupled to an output of the optical receiver and a transformer switch coupled to an output of the pulse width modulator. The pulse width modulator generates a pulse sequence which alternates between first and second states, each having respective durations and frequencies. At each change between the first and second states, the transformer switch selectively connects or disconnects the primary side of the transformer with the input line. By changing the frequency and duration for which the transformer switch selectively connects or disconnects the primary side of the transformer, the charging circuit will have sufficient charge to power the energy demanding components when the power switch is in the first position, sufficient charge to power the switching system when the power switch is in the second position, but insufficient charge to operate the energy demanding components when the power switch is in the second position.

REFERENCES:
patent: 4460951 (1984-07-01), Fenter et al.
patent: 4649464 (1987-03-01), Shono
patent: 4825350 (1989-04-01), Brackman, Jr.
patent: 5499184 (1996-03-01), Squibb

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