Continuously operating standby A-C power system
First Claim
1. A power-supply system having an input and an output connected by an A-C voltage transmission means for providing at said output a regulated A-C voltage, which comprises:
- (a) sensing means to sense the voltage waves in said transmission means on the input and output sides of said system, said sensing means being directly connected to said transmission means whereby there is no substantial phase shift between said transmission means and said sensing means,(b) means responsive only to said input A-C voltage wave for determining the occurrence in said input voltage wave of at least one of a predetermined number of undesirable conditions, said means generating a first signal of predetermined amplitude upon said occurrence and a second signal of predetermined amplitude upon the nonoccurrence of said undesirable conditions,(c) a switch means interposed in said transmission means between said input and output thereof, said switch means normally operating in a closed condition and being adapted to be selectively inhibited, upon the occurrence of said first signal, to thereby prevent transmission of said input A-C voltage wave to said output,(d) a standby power system including a bidirectional inverter connected between a battery and said output and adapted to supply from said battery an A-C voltage wave of predetermined frequency to said output during periods when said switch means is inhibited, and(e) a phase control means operating in a loop between said input and said output, said loop being the only loop in said system and fully closed when said switch means operates in a closed condition, said phase control means responsive when said loop is fully closed to said input and output voltage waves and said second signal for controlling the phase relationship between said voltage waves, said phase control means responsive to said first signal for fully opening said fully closed loop and for controlling said frequency of said A-C voltage wave supplied by said standby power system.
2 Assignments
0 Petitions
Accused Products
Abstract
A continuously operating standby A-C power system which uses a single loop responsive to the system'"'"'s input and output A-C voltages, the voltage of the battery included in the standby portion of the supply and the amplitude and frequency of the input A-C voltage for controlling the phase relationship between the input and output voltages. When the input A-C voltage is acceptable in both amplitude and frequency, the loop is closed. When the voltage becomes unacceptable, the loop opens. When the voltage returns to acceptability after a period of nonacceptability, circuitry is included in the system for slowly closing the loop.
49 Citations
20 Claims
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1. A power-supply system having an input and an output connected by an A-C voltage transmission means for providing at said output a regulated A-C voltage, which comprises:
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(a) sensing means to sense the voltage waves in said transmission means on the input and output sides of said system, said sensing means being directly connected to said transmission means whereby there is no substantial phase shift between said transmission means and said sensing means, (b) means responsive only to said input A-C voltage wave for determining the occurrence in said input voltage wave of at least one of a predetermined number of undesirable conditions, said means generating a first signal of predetermined amplitude upon said occurrence and a second signal of predetermined amplitude upon the nonoccurrence of said undesirable conditions, (c) a switch means interposed in said transmission means between said input and output thereof, said switch means normally operating in a closed condition and being adapted to be selectively inhibited, upon the occurrence of said first signal, to thereby prevent transmission of said input A-C voltage wave to said output, (d) a standby power system including a bidirectional inverter connected between a battery and said output and adapted to supply from said battery an A-C voltage wave of predetermined frequency to said output during periods when said switch means is inhibited, and (e) a phase control means operating in a loop between said input and said output, said loop being the only loop in said system and fully closed when said switch means operates in a closed condition, said phase control means responsive when said loop is fully closed to said input and output voltage waves and said second signal for controlling the phase relationship between said voltage waves, said phase control means responsive to said first signal for fully opening said fully closed loop and for controlling said frequency of said A-C voltage wave supplied by said standby power system. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power-supply system having an input and an output connected by an A-C voltage transmission means for providing at said output a regulated A-C voltage, which comprises:
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(a) sensing means to sense the voltage waves in said transmission means on the input and output sides of said system, said sensing means being directly connected to said transmission means whereby there is no substantial phase shift between said transmission means and said sensing means, (b) a switch means interposed in said transmission means between said input and output thereof, said switch means normally operating in a closed condition and being adapted to be selectively inhibited, upon the occurrence of at least one of a predetermined number of undesirable conditions in said input voltage wave, to thereby prevent transmission of said input A-C voltage wave to said output, (c) a standby power system including a bidirectional inverter connected between a battery and said output and adapted to supply from said battery an A-C voltage wave of predetermined frequency to said output during periods when said switch means is inhibited, and (d) a phase control means operating in a loop between said input and said output, said loop being the only loop in said system and fully closed when said switch means operates in a closed condition, said phase control means responsive when said loop is fully closed to said input and output voltage waves for controlling the phase relationship between said voltage waves, said phase control means responsive to the occurrence of at least one of said predetermined number of undesirable conditions for fully opening said fully closed loop and for controlling said frequency of said A-C voltage wave supplied by said standby power system. - View Dependent Claims (9, 10, 11, 12)
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13. A continuously operating standby power supply and battery charging system having an input and an output and an A-C transmission means connected therebetween for supplying at said output a regulated A-C voltage which comprises:
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(a) an inverter adapted to permit flow of current in both directions therethrough; (b) circuit means to maintain said inverter continuously connected to said output; (c) circuit means to connect a storage battery to said inverter in such a manner that flow of current through said inverter in one direction effects supplying of energy from said battery to said line, and flow of current through said inverter in the opposite direction effects charging of said battery from said line; (d) sensing means to sense the voltage waves in said transmission means on the input and output sides of said system, said sensing means being directly connected to said transmission means whereby there is no substantial phase shift between said transmission means and said sensing means; (e) a switch means interposed in said transmission means between said input and output thereof, said switch means normally operating in a closed condition and being adapted to be selectively inhibited, upon the occurrence of at least one of a predetermined number of undesirable conditions in said input voltage wave, to thereby prevent transmission of said input A-C voltage wave to said output; and (f) a phase control means operating in a loop between said input and said output, said loop being the only loop in said system and fully closed when said switch means operates in a closed condition, said phase control means responsive when said loop is fully closed to said input and output voltage waves and the voltage on said battery for controlling the phase relationship between said voltage waves, said phase control means controlling said phase relationship to effect current flow through said inverter in said one direction when said battery voltage is greater than a reference voltage and to effect current flow through said inverter in said opposite direction when said battery voltage is less than said reference voltage. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification