Electric power conversion systems – Current conversion – With starting arrangement
Patent
1988-03-17
1988-12-13
Wong, Peter S.
Electric power conversion systems
Current conversion
With starting arrangement
363 21, 323901, 323908, H02M 3335
Patent
active
047915447
ABSTRACT:
A regulating control circuit for a single-ended switching power supply includes means for controlling the switching duty cycle during start-up, normal operation and current limiting modes. Normal operation utilizes a duty cycle of less than about 50%, but low input voltage operation can occur for limited times at duty cycles up to 70%-80%. A time base generator defines the maximum permissible switch conduction time, as well as the switching rate. During start-up, input current is restricted to reduce dissipation within the control circuit, the start-up duty cycle also being maintained at a low value by extending the switch non-conduction time. In the current limiting mode, the duty cycle is reduced as a function of current demand to achieve constant current operation over a given range of output voltages, and to achieve current foldback below such range. In current foldback, the switch non-conduction period is extended to obtain unusually low duty cycles in near shorted output conditions.
REFERENCES:
patent: 3935527 (1976-01-01), Michelet et al.
patent: 4326245 (1982-04-01), Saleh
patent: 4459651 (1984-07-01), Fenter
patent: 4504898 (1985-03-01), Pilukaitis et al.
Gautherin George A.
Greenberg Sol
Veeco Instruments
Wong Peter S.
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