Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1989-08-22
1990-06-19
Salce, Patrick R.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 58, 363 98, 363132, H02M 3335
Patent
active
049358570
ABSTRACT:
A DC to DC series-parallel resonant converter (10) having a plurality of switches (Q1-Q4) which are switched alternatively between on and off states to cause electrical current to flow alternatively in first and second directions through a series-resonant circuit (60) Including a variable frequency ramp generator (28) having a reset input (R) for casuing an output ramp signal produced at an output to drop to zero in response to each reset signal; a comparator (30) having an input coupled to the output of the ramp signal generator, a second input for controlling the output DC voltage of the series-parallel resonant circuit and an output which changes level each time the ramp signal reaches the magnitude of the second input; a bistable circuit (32) having first and second outputs (Q, Q) for respectively outputting first and second signals, the output signals changing in response to a change in the output signal of the comparator coupled to the input; a pulse generator (26), coupled to the series-parallel resonant circuit for producing an output pulse train with an output pulse occurring each time the flow of current through the series-resonant circuit changes from one of the first and second directions to another of the first and second directions, the output pulses being applied to the reset input of the variable frequency ramp generator to regulate the frequency of the output ramp signal.
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patent: 4791542 (1988-12-01), Piaskowski
Dhyanchand John J.
Nguyen Vietson M.
Salce Patrick R.
Sundstrand Corporation
Todd Voeltz Emanuel
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