Switched mode power supply with synchronous preconverter

Details Switched mode power supply with synchronous preconverter Switched mode power supply with synchronous preconverter

1995-06-05

1998-06-02

Wong, Peter S.

Electric power conversion systems

Current conversion

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

315411, 363124, H02M 3335

Patent

active

057610576

ABSTRACT:
A power supply comprises: a rectifier; a power preconverter coupled to the rectifier; a switched-mode power supply circuit coupled to the power preconverter; and, a phase control circuit for synchronizing operation of the power preconverter with operation of the switched-mode power supply circuit. An energy storage device may be coupled to the power preconverter and to the switched-mode power supply circuit. A preconverter switch conducts during each time interval that a power switch in the switched-mode power supply circuit conducts in order, for example, to charge the energy storage device. The preconverter switch begins conducting only after each time interval begins and always stops conducting before each time interval ends. In a portion of the time interval after the preconverter switch has stopped conducting, a current can flow directly from the power preconverter to the switched-mode power supply circuit without, for example, charging the energy storage device.

REFERENCES:
patent: 4034280 (1977-07-01), Cronin et al.
patent: 5187414 (1993-02-01), Fellows et al.
patent: 5349515 (1994-09-01), Megeid
patent: 5349516 (1994-09-01), Megeid
patent: 5351177 (1994-09-01), Megeid
patent: 5402330 (1995-03-01), Megeid
Data Sheet for the LT1509 Power Factor and PWM Controller, published in 1995 in the USA by Linear Technology Corporation.

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