Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1989-01-23
1989-12-05
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 97, 358190, 315411, H02M 3335
Patent
active
048856738
ABSTRACT:
A switching power supply comprises a primary regulation system (CI3) and a secondary regulation system (CI2, CI1), supplying control signals (Pp, Ps) for a main switch (TP) and further comprises a comparison means (22), the output of which (Is) is set to "1" when the transformer (TA) of the switching current is demagnetized. A logic circuit (CL) receives the output signals (Is, Pp, Ps) and supplies on its output (25) a control signal (VS5) for the main switch (Tp) which can be set to "0" for the switching OFF of the main switch or to "1" for its switching ON, as a function of the following criteria: the control signal is set to "1" if the comparator output signal is set to "1", and if the output signal of at least one of the regulators is set to "1", and the control signal is set to "0" when the regulator output signal which has caused to control signal to be set to "1" is set to "0".
REFERENCES:
patent: 3909696 (1975-09-01), Katou et al.
patent: 4063307 (1977-12-01), Stephens
patent: 4459651 (1984-07-01), Fenter
patent: 4692852 (1987-09-01), Hoover
patent: 4731655 (1988-03-01), Lee et al.
SGS-Thomson Microelectronics S.A.
Wong Peter S.
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