| 摘要 |
<p>PURPOSE:To make a low voltage control possible and to make the equippment smaller and lighter and to obtain a sufficient output voltage stability, by a method wherein a control winding is provided in addition to an output winding to the secondary side of an iron resonance transformer and the output voltage of the output winding is controlled by the control winding. CONSTITUTION:An additional control winding N3 is provided to the secondary side of an iron resonance transformer T which has an input N1 and an output winding N2 and a rectifier D1 composed of a diode bridge is connected to the winding N3. Then a leveling capacitor C1, a control transistor Q1 is connected to the output of the control winding N3 and a diode D2 which eliminates ripples of a detected voltage is connected in series to the output of the rectifier D1. Moreover, voltage dividing resistors R3 and R4 for dividing the detected voltage and a variable resistor VR are provided and the output voltage of the resistor VR is put into the base of a comparing transistor Q2 through a diode D4. The collector of the transistor Q2 is connected to the base of Q1, the emitter of Q2 is onnected to a Zener diode DZ for a reference voltage and a capacitor C2 is connected to the voltage dividing resistor R3 and R4 in parallel.</p> |
