JPS5534877A - Power supply circuit - Google Patents

Abstract

PURPOSE: To provide the output waveform of an inverter symmetrically at the positive and negative in a power supply circuit by symmetrically providing a pair of transistor bias circuits.

CONSTITUTION: This power supply circuit has a series circuit of dividing capacitors C₁, C₂ and a series circuit of transistors Q₁, Q₂, connected in parallel with each other, a saturable transformer having primary winding N₁ connected between the intermediate connecting points of the respective series circuits and a pair of feedback windings N₃, N₄ connected at respective one ends to the bases of corresponding transistors and at the other respective ends though heat-sensitive resistance elements TH₁, TH₂ to impedance elements R₁∼R₄ provided at both ends of the dividing capacitors. Since the bias circuits are thus formed symmetrically, the output waveform of the inverter can further approach its symmetry at the positive and negative and the current loading of the respective transistor can be equalized. The inverter can produce its output constant even if the environmental temperature alters due to the heat-sensitive resistance elements.

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