G - Physics – 01 – L
Patent
G - Physics
01
L
340/142, 340/145
G01L 17/00 (2006.01) B60C 23/00 (2006.01)
Patent
CA 1065441
ABSTRACT OF THE DISCLOSURE The specification describes a switch condition transmitting device comprising a first assembly consisting of a switch and at least two coils which are serially connected when the switch is closed; the second assembly comprising at least a transmission coil and detection coil; the coils of the second assembly being magnetically coupled to each other and being positioned so that in one relative position of the assemblies, the transmission coils magneti- cally couple to one coil of the first assembly, while the detection coil is magnetically coupled to the other coil of the first assembly; exciting means for causing the trans- mission coil of the second assembly to generate; an alternat- ing magnetic field; and detecting means coupled to the detection coil of the second assembly for producing different outputs respectively when the switch is closed and when the switch is opened. The detecting means comprises a phase comparator, having a first input connected to the exciting means and a second input connected to the detection coil. The phase comparator provides at an output, a first output signal when the switch is open and the detection coil is excited only from the field of the transmission coil and a second output signal when the switch is closed and the detection coil is excited from the second coil of the first assembly.
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