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royer oscillator
A Royer oscillator is an electronic oscillator circuit based on a relaxation oscillation, saturable-core transformer. It was invented and patented in 1954 by George H. Royer.〔(Royer oscillator circuit United States Patent 2783384 )〕 It has the advantages of simplicity, low component count, rectangle waveforms and easy transformer isolation. The classic Royer circuit outputs square waves; a modified version (essentially by the addition of one capacitor) turns it into a harmonic oscillator, outputting sine waves. Both versions have found (and still have) significant applications, mainly as power inverters.
== Circuit description ==
The circuit consists of a saturable-core transformer with a center-tapped primary winding, a feedback winding and (optionally) a secondary winding. The two halves of the primary are driven by two transistors in push-pull configuration. The feedback winding couples a small amount of the transformer flux back in to the transistor bases to provide positive feedback, generating oscillation. The oscillation frequency is determined by the maximum magnetic flux density, the power supply voltage, and the inductance of the primary winding.
The basic Royer generates square wave output.〔Pressman et al., p. 266〕
The need to use a saturable-core limits the choice of core material. Some common materials are:
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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