The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 1982
Filed:
Oct. 31, 1979
Michael Farrer, Linton, GB;
Raymond A Perryman, Newmarket, GB;
Gould Advance Limited, Hainault, GB;
Abstract
Power supply apparatus is disclosed including an inverter, such as a half-bridge inverter, and control means for controlling the frequency of operation of the inverter. The control means includes a further control winding on the transformer of the invertor, and means for applying a short circuit of one or other or both polarities to the control winding in order to activate a switching transition of the inverter. In one embodiment, the control means is used to fix the frequency of operation of a free-running inverter; in another embodiment, short circuits of both polarities are applied to the control winding for an overlap period in order to provide a 'dwell' period between switch-off of one inverter transistor and switch-on of the other, this method of operation providing pulse width modulation control of the output waveform of the inverter.