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A DC fan fault detection circuit

A fault detection circuit, DC fan technology, applied in current collection and fault detection circuit, aviation electrical system fault field, can solve the problems of overheating of fan power supply, lack of fault protection for cooling fan of aviation power supply, etc., to avoid false alarm faults and ensure differential Sampling accuracy, effect of simplified complexity

Active Publication Date: 2020-06-09
天津航空机电有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a reliable current acquisition and fault detection circuit for the low-voltage DC cooling fan of the aviation power supply, so as to solve the problem of overheating of the power supply caused by the failure of the cooling fan of the aviation power supply due to the lack of fault protection

Method used

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  • A DC fan fault detection circuit
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  • A DC fan fault detection circuit

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] figure 1 It is a block diagram of the fan fault detection principle, the system input is the system power supply terminal 28VDC and GND, and the system output is the fault alarm output terminal FAN_ERR and GND. The fans are connected in series to the input end of the DC fan fault detection circuit.

[0025] The fan fault detection board is mainly divided into 5 functional areas, which are differential current detection, filter circuit, delay protection circuit, fault output circuit, power supply and reference circuit.

[0026] figure 2 It is a differential current detection circuit, and the sampling resistor and the rectifier diode are connected in series in the fan power supply circuit. The sampling resistor adopts 10 parallel resistors to convert the fan current signal into a voltage signal on the resistor. The sampling resistor value is R, and w...

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Abstract

The invention relates to a fault detection circuit for a direct current fan. The fault detection circuit is composed of a differential current detection circuit, a filter circuit and a delay protection circuit. A working current of the delay protection circuit passes the differential current detection circuit to obtain a sampled voltage which is output to the filter circuit to be filtered to obtain a voltage signal in proportion to the current of the direct current fan, and the voltage signal is output to the delay protection circuit to obtain a fault voltage signal of the direct current fan for outputting faults. The circuit can detect and alarm two fault states, namely short circuit and locked rotation of the fan effectively.

Description

technical field [0001] The invention relates to faults in aviation electrical systems and belongs to the field of electrical safety. In particular, the invention relates to a current collection and fault detection circuit of a low-voltage DC cooling fan of an aviation power supply. Background technique [0002] Aviation power supply is an important part of multi-electric aircraft, and its reliability is directly related to the safety of the entire aircraft. The overheating of components is closely related to the reliability of power supply products, and the thermal design and overheating protection of power supply products are becoming more and more important. The combination of derating design and thermal design can make the components work within the rated temperature range, but once the fan is damaged, the temperature of the product will rise sharply, which will eventually lead to product damage or shorten the product life. The fan fault detection function of aviation p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D27/00
CPCF04D27/001
Inventor 李凯峰李阳王中伟
Owner 天津航空机电有限公司
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