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A method for detecting leakage current of pyrotechnics in power distribution modules containing solid state relays

A technology of leakage current detection and solid state relay, which is applied in the direction of instruments, measuring electronics, measuring devices, etc., can solve problems such as unsatisfactory, achieve the effects of reducing cost and volume, simplifying the system, and realizing real-time self-testing

Active Publication Date: 2016-08-17
CHINA AEROSPACE TIMES ELECTRONICS CORP
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AI Technical Summary

Problems solved by technology

It cannot meet the requirements of real-time monitoring of leakage current required by bomb-mounted products

Method used

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  • A method for detecting leakage current of pyrotechnics in power distribution modules containing solid state relays
  • A method for detecting leakage current of pyrotechnics in power distribution modules containing solid state relays
  • A method for detecting leakage current of pyrotechnics in power distribution modules containing solid state relays

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Embodiment Construction

[0033] Circuit connection such as figure 1 As shown, a 1K resistor and an ammeter are connected in series at both ends of B and C. When measuring the leakage current of SSR1~SSR4, only one-degree fault is considered (that is, only one of SSR1~SSR4 has leakage current).

[0034] (1) Assuming that there is no leakage current from SSR1 to SSR4, the current detected by the leakage current detection terminal is:

[0035] Set the power input voltage to 28V

[0036]

[0037] Then set the first leakage current detection value I 漏电流1 The threshold is 0.9032±0.1mA.

[0038] If the detection result is the first leakage current detection value I 漏电流1 If it is less than 0.8032mA, SSR3 and SSR4 have leakage current. Calculate the leakage current of SSR3 and SSR4 (that is, the negative bus switch of pyrotechnic products).

[0039] Calculate the voltage between C and D as:

[0040] u CD = I 漏电流阈值下限 ×(R 3 +R 4 )<0.8032mA×15K=12.048V

[0041] Then the current flowing between A an...

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Abstract

Provided is a detection method for initiating explosive device leakage current of a power distribution module with a solid relay. In factory debugging of the power distribution module, the situation of leakage current of four solid relay switches of an initiating explosive device load bus is confirmed via an initiating explosive device load branch series-connected test resistor and an ammeter of the power distribution module; and after the situation of leakage current of the solid relay switches of the power distribution module is qualified, an initiating explosive device load is connected and leakage current is detected again, and leakage current of an ignition switch in the initiating explosive device load is confirmed according to the situation of leakage current of the switches of the initiating explosive device bus confirmed in the former step and a current leakage current detection result. In the later use process of the module, the real-time detection result of leakage current is uploaded to a user upper interface via a detection circuit and a processor circuit so that safety of an initiating explosive device system can be conveniently confirmed by a user in real time. Complexity of detection is simplified, cost and volume of the detection circuit are reduced and safety of the initiating explosive device load of the power distribution module is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a high-side voltage detection method in a multi-channel solid relay series-parallel circuit and a method for detecting leakage current of a MOS device in the solid relay. Background technique [0002] Existing leakage current detection technologies for MOS devices are mostly carried out using semiconductor testers before device assembly, which can achieve high detection accuracy. Once the MOS device is assembled in the system, its leakage detection is difficult to realize. However, since MOS devices are very sensitive to static electricity, it is easy to cause soft damage to the device during the electrical assembly process. This kind of soft damage will affect the service life of the device and lead to unknown failure. At this time, a better way to detect the soft damage is to detect the leakage current of the MOS device in the system. The leakage detec...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/25G01R31/02
Inventor 赵英凯张靖娴唐侃于伦正华皛文新
Owner CHINA AEROSPACE TIMES ELECTRONICS CORP
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