| 摘要 |
PURPOSE:To control an input voltage so that it converges to a predetermined fixed threshold level, by performing stabilizing control by feedback as a substitute for feedforward. CONSTITUTION:A transformer 10 is equipped with a primary winding 11, secondary windings 12 and 12', etc., and a winding 13 for detection. Then, a CR time constant circuit 21 is added at the output side of the detecting winding 13 to perform pulse-width modulation control which corresponds to the time until the output of the CR time constant circuit 21 reaches a prescribed threshold level. A pulse-width modulation control circuit 15 converts a DC input DCin into an AC signal by turning on and off a switch element (e.g. transistor) 16. |
