Donald G Sommer

US Patent:

41953355, Mar 25, 1980

Filed:

Jul 20, 1978

Appl. No.:

5/926455

Inventors:

David Murakami - Federal Way WA
Donald J. Sommer - Seattle WA

Assignee:

The Boeing Company - Seattle WA

International Classification:

H02P 1316

US Classification:

363 49

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.