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Testing operation of a switching device by using a pulldown device to short a load

A switching circuit and switching technology, applied in the field of switching circuits and their testing, can solve problems such as failure to test

Active Publication Date: 2012-07-25
GE AVIATION SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the failure is open, the failure may not be tested

Method used

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  • Testing operation of a switching device by using a pulldown device to short a load
  • Testing operation of a switching device by using a pulldown device to short a load
  • Testing operation of a switching device by using a pulldown device to short a load

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Embodiment Construction

[0009] figure 1 An example of a circuit comprising a switching circuit 1 connected to a voltage source 2 is shown. The circuit has an output 5 connected to a load 15 . The circuit, for example, may be provided on board the aircraft so that the voltage source 2 may be provided by a diesel generator set, and the load 15 may be a component on the aircraft for actuating the landing gear flaps or landing gear, or within the aircraft. components (eg, instrumentation or in-flight entertainment). The switching device 1 may comprise a single switching device 6, or a plurality of switching devices 6, 7, . . . , n. The switching devices are connected in parallel. The switching devices may each comprise any suitable solid state switching device, such as a field effect transistor. Switching circuit 1 is used to connect power source 2 to load 15 . The voltage source 2 and its associated cable or line will have an inherent inductance 11 . Similarly, the load and its associated cables a...

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PUM

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Abstract

A switching circuit 1 connecting a load 15 to a voltage source 2 comprises one or more switching devices 6, 7, for switching on and off power to the load, a pulldown device 4 for shorting out the load thereby isolating it from the voltage source, and a controller 3 operable while the source is isolated from the load to activate at least one of the switching devices at a time, wherein a current passes through the or each activated switching device and is measurable to test whether the or each activated switching device is operating correctly. The switching devices are thus tested in situ. The switching devices may form part of a circuit in an aircraft, where the source 2 would be an engine generator.

Description

technical field [0001] The invention relates to a switch circuit and a testing method thereof. Background technique [0002] Generally, a switching circuit includes several switching devices connected in parallel with each other, so that the current capacity of the switching circuit is the sum of the capacities of the switching devices. This is especially effective in applications where the load requires more power than a single switching device can handle. An example of such a switching circuit may be found in an aircraft power distribution system, where for example 8 solid state switching devices may be provided in parallel. Typically, switching devices can fail open or closed. Each switching device has a drive which may be the cause of the failure. If one or more switching devices fail open, the other switching devices can act as backup switches, but this is potentially subject to current overload. If one or more switching devices fail closed, it is unlikely that the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327H02M1/00
CPCG01R31/3278G01R31/008G01R31/2617G01R31/327
Inventor P·M·泰勒J·O·科林斯
Owner GE AVIATION SYST LTD