Switching power supply having a wide range input capability

Electric power conversion systems – Current conversion – With starting arrangement

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323DIG1, H02P 1316

Patent

active

041953355

ABSTRACT:
A switching regulator type power supply, including a series switching element which, when energized, provides a voltage signal to an averaging filter, the output of which is applied to follow-on inverter and filtering circuits to produce a desired output voltage. In the startup mode of the supply, the switching element is energized by a circuit portion functioning as a blocking oscillator. The control action of the blocking oscillator results in a series of incremental increases in the voltage output of the averaging filter, thus avoiding large startup currents. When the output of the averaging filter reaches a predetermined first level, an error amplifier circuit is initiated, which forces the circuit portion to function as a constant current switched amplifier. The switching regulation of the error amplifier also results in a series of incremental increases in the output of the averaging filter, until a steady-state output is reached, at which point the switching element is controlled by normal regulation action.

REFERENCES:
patent: 3349311 (1967-10-01), Dudley
patent: 4130862 (1978-12-01), Holt

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