Switch power supply circuit

Abstract

The invention discloses a switch power supply circuit, comprising a primary conversion module, a peak energy collection module and a secondary conversion module; wherein energy storage and exergic processes of inductive elements connected with the primary conversion module are controlled by a switching tube, thus conversion of electric energy input by the power supply input terminal is carried out and electric energy after conversion is output by the power output terminal; the peak energy collecting module collects peak energy which is caused by leakage induction of inductive elements and capable of resulting in breakdown of the switching tube; and the secondary conversion module is in charge of conversion on the peak energy collected by the peak energy collecting module and returning energy after conversion to the power supply input terminal or the power supply output terminal. By adopting the embodiment of the invention, the switching tube of switch power supply can be prevented from breakdown and conversion efficiency of the switch power supply can be improved.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a switching power supply circuit. Background technique [0002] Switching power supply is a power supply that directly controls the inductive element (inductor or transformer) connected to it by the switching tube, and realizes voltage or current conversion through the energy storage and energy discharge process of the inductive element. It is widely used in industrial control, communication office , household consumption and other electronic equipment. The switching tube in the switching power supply may be a three-terminal control device such as a triode, a field effect transistor, an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT for short), a thyristor, or a derivative thereof. Because the switching tube only works in the on or off state of low power consumption, the switching power supply has higher conversion efficiency than the traditional ...

AI Technical Summary

Problems solved by technology

[0005] In the existing switching tube anti-breakdown protection circuit of the switching power supply, because the peak energy at the output end of the switching tube is finally consumed by the release circuit in the form of heat, the conversion efficiency of the switching power supply is low

Moreover, although the duration of the electromotive force peak caused by the leakage inductance of the transformer is short, the current value is very large, often dozens of times the normal conduction current, making it difficult to improve the efficiency of the switching power supply

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