Electrical transmission or interconnection systems – Wave form or wave shape determinative or pulse-producing... – With capacitor
Patent
1987-02-19
1988-03-01
Gellner, Michael L.
Electrical transmission or interconnection systems
Wave form or wave shape determinative or pulse-producing...
With capacitor
307262, H03K 300, H03K 500
Patent
active
047288108
ABSTRACT:
Long conductors in a common cable which interconnect control pushbuttons to the basic control circuit for an electromagnetic contactor often have distributed capacitance between them. This distributed capacitance may conduct capacitive current from the power supply line to a parallel control line. This current interacts with high impedance in the control circuit for producing a voltage, or False signal, which may be of a magnitude which would otherwise be supplied by an ON pushbutton. In order to discriminate between a TRUE signal and a False signal the first capacitor is connected between the power supply conductor in system common and a second capacitor, larger than the first capacitor, is connected between a signal conductor and system common so that under normal circumstances the alternating voltage on the second conductor lags the alternating voltage on the first conductor by an amount .DELTA. except when the voltage on the second conductor is provided by the capacitive current between lines in which case the voltage on the second conductor will lead the voltage on the first conductor by an amount .gamma. due to the capacitive nature of the current. The microprocessor is conditioned to look at the two voltages immediately after the voltage on the first conductor changes state to determine if the signal is produced by a closed pushbutton or capacitive current.
REFERENCES:
patent: 3339161 (1967-08-01), Conner et al.
patent: 4456867 (1984-06-01), Mallick, Jr. et al.
patent: 4461986 (1986-06-01), Maynard et al.
patent: 4467260 (1984-08-01), Mallick, Jr. et al.
patent: 4476423 (1984-10-01), Mallick, Jr. et al.
patent: 4481426 (1984-11-01), Nakagawa
patent: 4638279 (1987-01-01), Brisson et al.
Gellner Michael L.
Moran M. J.
Porterfield David
Westinghouse Electric Corp.
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