Self-excited type converter device

Abstract

Abstract PURPOSE:To stabilize the output voltage of a rectifying smoothing circuit by connecting a controlling transistor between feedback winding and a base of a switching transistor and controlling the output voltage in response to the variation of the output voltage. CONSTITUTION:An emitter and a collector of the controlling transistor Q3 are each connected between the base of the switching transistor Q1 and the secondary winding N2 of the self-excited type converter device, and a bias resistor R3 is connected between the collector and a base. A sliding terminal of a detecting resistor VR detecting the variation of the output voltage is connected to a base of a transistor Q4 for detection, and the collector is connected to the base of the transistor Q3. When the output voltage increases, impedance between the collector and an emitter of the transistor Q4 lowers, the bias currents of the transistor Q3 decrease and the base currents of the transistor Q1 diminish, and the output voltage is lowered.

Inventors

• 👤 Takashi Tsukada
• 👤 Hideji Kazuma

Bibliographic Details