D.C. TO A.C. POWER CONVERTER

• US 3,461,372 A
• Filed: 01/17/1966
• Issued: 08/12/1969
• Est. Priority Date: 01/22/1965
• Status: Expired due to Term

• Current Assignee: John R. Barton, Pickup Clive Parnell
• Original Assignee: John R. Barton, Pickup Clive Parnell
• Inventors: PICKUP CLIVE PARNELL, Barton, John R.
• Application Number:
  US04/521,189
• Time in Patent Office: 1,303 Days
• US Class Current: 363/40
• CPC Class Codes: H02M 7/537 using semiconductor devices only, e.g. single switched pulse inverters
• CPC Class Codes: H03F 3/217 Class D power amplifiers; Switching amplifiers
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A D.C. to A.C. converter in which power from a D.C. source fed through the collector-emitter circuit of a transistor is alternately switched on and off by a square wave applied to the base of said transistor. The lower even harmonics are attenuated by a plurality of series resonant circuits, each connected between the collector and emitter, while the lower odd harmonics are blocked from the output by a series of parallel resonant circuits connected between the collector and output, thereby providing a sinusoidal output at a frequency equal to the fundamental frequency of said square wave.

Claims