A self-excited push-pull converter

Abstract

The invention discloses a self-excitation push-pull type converter which comprises a Jensen circuit and is mainly characterized in that a two-terminal network with electric performance of accessing high frequency and stopping low frequency is formed between one end of magnetic saturation transformer primary winding in the Jensen circuit and one terminal of main transformer primary winding, namely the magnetic saturation transformer primary winding is connected in parallel with the main transformer primary winding through the two-terminal network. The self-excitation push-pull type converter disclosed by the invention has good self-protective capability, and can automatically recover normal work after disappearance of over-current and short circuit.

Description

technical field [0001] The invention relates to a self-excited push-pull converter, in particular to a self-excited push-pull converter used in industrial control and lighting industries. Background technique [0002] The existing self-excited push-pull converter, the circuit structure part comes from the self-excited oscillating push-pull transistor single-transformer DC converter invented by G.H.Royer in the United States in 1955, usually referred to as the Royer circuit, which also realizes high-frequency conversion. The beginning of the control circuit; in 1957, Jen Sen in the United States (Jen Sen, translated as "Jing Sen" in some places) invented the self-excited push-pull double transformer circuit, which was later called the self-oscillating Jensen circuit and the self-excited push-pull Jensen circuit. It is also known as Jingsen circuit; these two circuits are called self-excited push-pull converters by later generations. [0003] The self-excited push-pull conver...

AI Technical Summary

Problems solved by technology

[0016] 2. Once there is a short circuit at the output, the circuit stops vibrating, and the two push-pull transistors are in the off state; after the output overcurrent and the short circuit disappear, the circuit cannot return to the normal working state by itself

[0018] 3. image 3 , Figure 4 , Figure 5 In the existing Jensen circuit, when the output is over-current or short-circuited, the transistors TR1 and TR2 generate a lot of heat and are easily burned

[0027] This is only a 5V to 5V DC / DC converter with a power of 1W. In practical applications, most circuits work at higher voltages and higher powers. At this time, the existing Jensen circuit, after the output When current flow or short circuit occurs, the transistors TR1 and TR2 generate a lot of heat and are easily burned

[0028] 4. The existing circuits for solving the above-mentioned points 1, 2, and 3 are too complicated

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