Electrical transmission or interconnection systems – Plural supply circuits or sources – One source floats across or compensates for other source
Patent
1990-12-17
1993-07-13
Pellinen, A. D.
Electrical transmission or interconnection systems
Plural supply circuits or sources
One source floats across or compensates for other source
307 48, 307 65, H02J 110
Patent
active
052276660
ABSTRACT:
A switching circuitry for coupling the power output of one of a plurality of power supplies to a keyboard. In this disclosure, a switching transistor of the circuit is coupled to switch power from a power supply output to a common point to which a plurality of like circuits and a keyboard are coupled. A differential amplifier having one input coupled to the common point and another input coupled to the power output of the respective power supply compares voltage on the common point to the voltage of the power supply. If the power supply voltage is higher than the voltage on the common point, the amplifier provides an enabling signal to the transistor, coupling power from the power supply to the common point. Conversely, if the voltage on the common point is higher than the voltage of the power supply output, the amplifier provides a disabling signal to the transistor, decouping the power supply output from the common point. Diodes shunt the switching transistors in order to provide power to the differential amplifiers.
REFERENCES:
patent: 4017779 (1977-04-01), McDonald et al.
patent: 4492876 (1985-01-01), Colbert et al.
patent: 4617473 (1986-10-01), Bingham
patent: 4774450 (1988-09-01), Kitamura
Cybex Corporation
Osborn David
Pellinen A. D.
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