Complementary symmetrical self-excited push-pull converter

Abstract

The invention relates to a complementary symmetrical self-excited push-pull converter. The converter comprises a direct-current power supply V1, a capacitor C1, a resistor R1, a resistor R2, an NPN transistor Q1, an NPN transistor Q2, a resistor R3, a resistor R4, a capacitor C2, a capacitor C3, an NPN transistor Q3, an NPN transistor Q4, a high-frequency transformer T and a filter inductor Lf. The complementary symmetrical self-excitation push-pull converter disclosed by the invention has the following beneficial effects: 1, the consistency of products produced in batches is good, and the influence of high-frequency inductance is small; 2, the working frequency of the switching tube is stable; 3, the self-oscillation frequency can be designed to be relatively high, and correspondingly, the size of the high-frequency transformer is reduced, so that the cost is reduced; and 4, due to the driving of the independent self-excited oscillation circuit, the working power of the switching tubecan be selected to be greater.

Description

technical field [0001] The invention belongs to the field of power supplies, and mainly relates to switching power supplies, inverters, spark generators, frequency converters, electric welding machines, industrial control and lighting industries, and in particular to a complementary symmetrical self-excited push-pull converter. Background technique [0002] The circuit structure of the existing self-excited push-pull converter comes from the self-excited oscillating push-pull transistor single-transformer DC converter invented by George H. Initially, the above-mentioned circuit form is the famous Royer circuit. [0003] In 1958, T.Hehenkamp and J.J.Wilting described a modified Royer-style self-excited push-pull circuit in "Transistor D.C converters for Fluorescent-Lamp Power Supplies", specifically as figure 1 shown. [0004] In 1963, Ludwig (H. Ludwig) described a Royer-style self-excited push-pull circuit in "A time and voltage calibrator for biological amplifiers using ...

AI Technical Summary

Problems solved by technology

[0010] a) Poor consistency of mass-produced products;

[0011] b) The frequency characteristics are poor, not stable enough, the oscillation frequency is greatly affected by the high-frequency transformer, and it is difficult to adjust the switching frequency;

[0012] c) The general frequency is not high, resulting in a large transformer size and difficult to reduce costs;

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