Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1987-09-11
1988-11-29
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 66, 365229, H02J 906
Patent
active
047884509
ABSTRACT:
A P-channel field-effect transistor includes an inherent junction diode. As it is normally used, the inherent diode is back-biased and therefore effectively out of circuit. An uninterruptible power supply arrangement including primary and backup voltage sources supplies uninterrupted power to a load by way of two or more P-channel field-effect transistors connected so that their inherent diodes conduct to provide an OR function, independent of field-effect operation of the field-effect transistors. A control circuit controls the gate voltage relative to the source voltage of each transistor to selectively short-circuit the inherent diode of that one transistor which is connected to the power supply which is to energize the load. This reverse-biases the other inherent diodes and effectively removes the other power supply from the circuit, so that power for the load is drawn only from the selected power supply, there is no diode forward junction potential reducing the load voltage, and no excess dissipation. Certain embodiments of the invention use commercially available integrated circuits to provide many of the required functions for the uninterruptible supplies.
REFERENCES:
patent: 4492876 (1985-01-01), Colbert et al.
patent: 4617473 (1986-10-01), Bingham
patent: 4631470 (1986-12-01), Bingley
patent: 4698578 (1987-10-01), Mullersman et al.
"CMOS Cookbook" by Lancaster, pp. 217-221.
Texas Instruments Catalogues, pp. 3-69 and 3-70 relating to types SN54HC125,126 quadruple bus buffer gates with 3-state outputs, pp. 3-201 to 3-203 relating to types SN54HCT240 octal buffers and line drivers, pp. 3-257 and 3-258 relating to type SN54HC365 hex bus drivers, pp. 6-83 to 6-86 relating to types SN54LS240 octal buffers and line drivers, pp. 7-3 to 7-6 relating in general to CMOS circuitry and pp. 7-9 to 7-11 relating to IC protection circuits.
"Energy-Saving RAM-Power Tap" printed in NASA Tech Briefs, Sep. 1987.
Berard Jr. Clement A.
General Electric Company
Logan Sharon D.
Meise William H.
Shoop Jr. William M.
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