Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1995-06-05
1996-01-16
Sterrett, Jeffrey L.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 19, 315241P, H02M 3335
Patent
active
054853613
ABSTRACT:
A flyback charger for an energy-storage capacitor has a controller for causing the energy-storage pulses of current in the transformer primary winding and the energy-delivery pulses of current in the transformer secondary winding to be nearly flat-topped. The controller includes a peak-current-commanding current-mode control or a valley-current-commanding current-mode control which controls the duration of a switching circuit on and off interval, respectively, responsive to the current flowing in the transformer primary winding and secondary winding, respectively. A feed-forward controller controls the duration of the switching circuit off and on interval, respectively, in response to the voltage provided by the secondary winding and D-C supply voltage, respectively. When using the valley-current-commanding current-mode controller, there may be a fixed duration of the switching circuit on interval.
REFERENCES:
patent: 4070699 (1978-01-01), Einbinder
patent: 4104714 (1978-08-01), Smith et al.
patent: 4146832 (1979-03-01), McConnell
patent: 4272806 (1981-06-01), Metzger
patent: 4489369 (1984-12-01), Ginsberg
patent: 4546421 (1985-10-01), Bello et al.
patent: 4837495 (1989-06-01), Zansky
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