An Application of Frequency Entrainment in a DC-to-DC Converter

Inherent simplicity and high efficiency combined with an excellent dynamic behavior make the use of self-oscillating switching circuits an attractive alternative in the design of electronic power conditioning equipment. Unfortunately, these free-running circuits often suffer from large variations in operating frequency under varying line and load conditions, a deficiency which seriously limits their usefulness for many applications. A general approach is described by which this drawback can be remedied without impairing the aforementioned advantages.