Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1994-10-17
1997-03-11
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 49, 363 89, H02M 3335
Patent
active
056108036
ABSTRACT:
A pulse width modulated power supply minimizes overshoot during start up and when one phase of plural phase power supply resumes after dropping out. The power supply comprises an input transformer having a primary winding, a secondary winding and means for coupling one end of the primary winding to a power source. A switch is connected in series with the primary winding to control power through the primary winding. An output capacitor is coupled to receive current from the secondary winding to develop a DC output voltage. A differential amplifier is coupled to receive a reference voltage at a first input and a voltage based on the output voltage at a second input. A feedback capacitor is coupled between an output of the amplifier and the second input to filter out 120 hertz ripple. An output of the differential amplifier is used to control a duty cycle of the switch. A second capacitor is connected between the output capacitor and the second input of the amplifier to provide current to the second input during start up and/or resumption of the power source. This current delivered via the second capacitor reduces the error voltage during start up and when one power phase resumes after dropping out by reducing the error voltage. Thus, the current delivered via the second capacitor reduces overshoot. During subsequent, steady state conditions, the second capacitor charges to a steady state level and does not affect the error voltage.
REFERENCES:
patent: 5029269 (1991-07-01), Elliott et al.
patent: 5140511 (1992-08-01), Lee et al.
patent: 5373434 (1994-12-01), Malik
patent: 5498995 (1996-03-01), Szepesi et al.
International Business Machines - Corporation
Riley Shawn
Samodovitz Arthur J.
Wong Peter S.
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