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PBA switch circuit with insulation blocking function

A switching circuit, isolation protection technology, applied in the field of PBA switching circuit, can solve problems such as isolation and achieve good isolation effect

Inactive Publication Date: 2016-02-10
SHANGHAI AVIATION ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of lightning protection filtering, hard-wire signal and internal signal isolation in the prior art, and provide a new type of PBA switch circuit with isolation protection function

Method used

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  • PBA switch circuit with insulation blocking function

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Embodiment Construction

[0011] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0012] See figure 1 , shown in the figure is a PBA switch circuit with isolation protection function, which is mainly composed of lightning protection filter circuit unit, switch circuit unit and optocoupler circuit unit.

[0013] The lightning protection filter circuit unit has a TVS transistor D1, a first resistor R1 and a first capacitor C1. The external hard-wire signal terminal is respectively connected to the first end of the TVS tube D1 and the first end of the first resistor R1, and the second end of the first resistor R1 is connected to the first end of the first capacitor C1, The case ground CASEGND is respectively connected to the second end of the first capacitor C1 and the second end of the TVS transistor D1. Wherein, the external hard-wired signal terminal provides a voltage of 28VDC direct current signal, and the critical frequency ...

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PUM

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Abstract

The invention relates to a PBA switch circuit with an insulation blocking function, which comprises a lightningproof filter circuit unit, a switching circuit unit and a photocoupled circuit unit, wherein the lightningproof filter circuit unit is provided with a TVS tube, a first resistor and a first capacitor; the switching circuit unit is provided with a second resistor, a third resistor, a fourth resistor, and a field-effect tube; and the input end of the photocoupled circuit unit is connected with the output end of the lightningproof filter circuit unit, and the output end of the photocoupled circuit unit is connected with the first end of the second resistor. The PBA switch circuit disclosed by the invention has the advantages that external interference signals are isolated from internal signals, and the isolation effect is good.

Description

technical field [0001] The invention relates to a PBA switch circuit with isolation protection function. Background technique [0002] Illuminated Push Button Switches and Annunciators PBA (Illuminated Push Button Switches and Annunciators) is an indispensable electrical component in airborne equipment, mainly used for information indication and control input. Most of the PBAs are driven by the internal signals of the airborne equipment to control their switches, but some of them are controlled by internal signals in the light inspection mode, and controlled by external hard-wired signals in the non-light inspection mode, which inevitably introduces external Interfering signals must be isolated from internal signals. However, at present, the isolation effect of the existing PBA switch circuit is poor, and no relevant isolation measures are even taken. At the same time, as a natural phenomenon, lightning occurs from time to time during the flight of the aircraft. If the ext...

Claims

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Application Information

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IPC IPC(8): H03K17/78
Inventor 陶辉
Owner SHANGHAI AVIATION ELECTRIC