Touch control switch circuit with compensation for power supply

Details Touch control switch circuit with compensation for power supply Touch control switch circuit with compensation for power supply

1976-06-16

1978-03-28

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

328 5, 307251, 331 65, 340258C, H03K 326

Patent

active

040817008

ABSTRACT:
A touch control switch circuit operable by a hum pickup signal induced in a human body by a power supply line incorporates a compensation arrangement to eliminate false operation of the circuit by fluctuations in the power supply signal. The circuit comprises a touch receptor operable by electrical contact with the human body to receive the induced hum pickup signal, a touch detector responsive to the hum pickup signal received by the touch receptor for producing an output signal in response to a change in amplitude of the hum pickup signal, and a compensation circuit responsive to the power supply signal for controlling operation of the touch detector to prevent a false output signal in response to fluctuations in the power supply signal. The compensation arrangement may be embodied as a reference detector which provides a variable reference signal for the touch detector to compensate for power line fluctuations or which disables the touch detector output upon the occurrence of power line fluctuations.

REFERENCES:
patent: 3764819 (1973-10-01), Muller
patent: 3784848 (1974-01-01), Hamilton
patent: 3919596 (1975-11-01), Bellis

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