Testable solid state switch and related method

Details Testable solid state switch and related method Testable solid state switch and related method

1994-04-28

1996-11-12

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

340512, G01R 104

Patent

active

055743854

ABSTRACT:
A switch module for connection between a power source and a controlled load, and a method for its operation, the switch module being testable without regard to the nature of the load, the nature of the power source, or whether the switch is actually connected to the power supply and its controlled load. The switch module has two pairs of MOS FET solid state switches, each pair connected back-to-back to allow switching of alternating current (ac) as well as direct current (dc) in either direction. Each pair of switches in the module has an associated independent power source, which is used in the preferred embodiment of the invention to supply a control signal to each switch and to supply a test current through the switch when it is closed. Test pulses invert the state of each switch momentarily and corresponding test current pulses are observed if a switch is operating properly. A missing switch-off pulse when the switch module is connected to a load circuit may be caused by the presence of an inductive load, and this is assumed to be case if there is a missing pulse in both pairs of switches. Generating at least two closely spaced test pulses allows elimination of errors arising when one pulse is generated too close to a current zero crossing in an ac circuit.

REFERENCES:
patent: 5428300 (1995-06-01), Takahashi et al.

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