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Switching tube fault detection circuit in BUCK topological switching power supply

A technology of switching power supply and topological circuit, which is applied in the fields of communication, aerospace and aviation, can solve the problems of slow detection circuit speed and inaccurate detection results, and achieve the effects of ensuring accuracy, wide application range and reducing costs

Active Publication Date: 2014-07-16
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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  • Switching tube fault detection circuit in BUCK topological switching power supply
  • Switching tube fault detection circuit in BUCK topological switching power supply
  • Switching tube fault detection circuit in BUCK topological 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 drawings.

[0019] Such as figure 1 As shown, the circuit of the present invention for detecting switch tube failures in a BUCK topology switching power supply includes an input protection circuit 1, a rectifier filter circuit 2, a PWM control circuit 3, a basic BUCK topology circuit 4, and an output circuit 5, all of which are connected in sequence. Known prior art. Based on 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 switches in the basic BUCK topology circuit. Whether the tube is faulty or not.

[0020] Such as figure 2 As shown, the input protection circuit 1, the rectifier filter circuit 2, the PWM control circu...

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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 aviation, aerospace, communication and other fields. Background technique [0002] At present, BUCK topology switching power supplies are widely used in aviation, aerospace, satellite, ship, communications and other fields. In these applications, extremely high requirements are put forward for the reliability, stability, and safety of the power supply. The switch 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 situation, people adopt the technology for error tolerance of the switching tube, and the premise of realizing the error tolerance of the switching tube is to detect the faul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00G01R31/26
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