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A switching tube fault detection circuit in a buck topology switching power supply

A topology circuit and switching power supply technology, applied in the fields of communication, aerospace and aviation, can solve the problems of inaccurate detection results and slow detection circuit speed, and achieve the effect of wide application range, guaranteed accuracy and simple circuit.

Active Publication Date: 2016-03-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These detection circuits still have shortcomings such as slow speed and inaccurate detection results. It is necessary to add a circuit to eliminate interference in the design of the detection circuit, which is still far from practical application.

Method used

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  • A switching tube fault detection circuit in a buck topology switching power supply
  • A switching tube fault detection circuit in a buck topology switching power supply
  • A switching tube fault detection circuit in a buck topology switching power supply

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Embodiment Construction

[0018] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings.

[0019] like figure 1 As shown, the present invention detects the switching tube fault circuit in the BUCK topology switching power supply, including the input protection circuit 1, the rectification filter circuit 2, the PWM control circuit 3, the basic BUCK topology circuit 4 and the output circuit 5 connected in sequence, and the above circuits are all known prior art. On the basis of the above circuit, a differential circuit 6 and a voltage comparison circuit 7 are added, the output of the output circuit 5 is connected to the differential circuit 6, the output of the differential circuit 6 is connected to the voltage comparison circuit 7, and the voltage comparison circuit 7 outputs the switch in the basic BUCK topology circuit A sign of whether the tube is faulty.

[0020] like figure 2 As shown, the input protection circuit 1, the rectifica...

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Abstract

A switching tube fault detection circuit in a BUCK topological switching power supply comprises an input protective circuit, a rectification filter circuit, a PWM control circuit, a basic BUCK topological circuit and an output circuit, wherein the input protective circuit, the rectification filter circuit, the PWM control circuit, the basic BUCK topological circuit and the output circuit are connected in sequence. The switching tube fault detection circuit is characterized in that a differential circuit and a voltage comparison circuit are additionally arranged, the output of the output circuit is connected with the differential circuit, the output of the differential circuit is connected with the voltage comparison circuit, and a marking signal indicating whether a switching tube breaks down or not is output through the voltage comparison circuit.

Description

technical field [0001] The invention relates to a switching power supply, in particular to a switching tube fault detection circuit in a BUCK topology switching power supply, which is suitable for constant voltage loads and related fields such as aviation, spaceflight, and communication. Background technique [0002] At present, the switching power supply of the BUCK topology is widely used in aviation, aerospace, satellite, ship, communication and other fields. In these applications, extremely high requirements are put forward for the reliability, stability and safety of the power supply. However, the switching tube in the switching power supply may work abnormally, causing the entire power system to collapse. Common switch tube abnormalities include switch tube short circuit and switch tube open circuit. In order to avoid this kind of situation, people adopt the technology aimed at the fault tolerance of the switching tube, and the premise of realizing the fault tolerance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/00G01R31/27
Inventor 孙伟锋张太之许满超朱俊杰钱钦松陆生礼时龙兴
Owner SOUTHEAST UNIV