SELF-EXCITED RESONANCE ELECTRIC POWER FOR DISCHARGE LAMP

摘要

PROBLEM TO BE SOLVED: To provide a self-excited resonance electric power source capable of constituting a small and economical electric power source by adding function of stabilizing and altering output electric current to a self-excited resonance electric power source circuit itself. ;SOLUTION: In a self-excited resonance electric power source with a push-pull constitution, an error signal corresponding to the differential of the voltage signal equivalent to the output electric current and the standard voltage is supplied to the respective gates of a first transistor Q1 and a second transistor Q2 from a control part 3. Consequently, electric communication timing in each transistor is changed to transfer the self-excited resonance frequency. When the self-excited resonance frequency is transferred, the energy quantity transmitted to a secondary winding N2 from a resonance circuit constituted of a primary winding N1 of a transformer and a capacity part Cre for resonance is changed to make the output electric current controllable.;COPYRIGHT: (C)1999,JPO