AC-DC switching regulator to supply uninterruptible power
First Claim
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1. In an uninterruptible power supply:
- a power coupling medium having a first input to accept a periodic signal source;
a rectifier coupled to rectify signals transmitted by the power coupling medium;
said uninterruptible power supply characterized bya switching device coupled to the rectifier and to an output of the power coupling medium and operative to disable the power coupling medium;
said switching device being further coupled to a second input to accept a nonperiodic signal source and operative to invert the nonperiodic signal source at the second input upon diminution of the periodic signal source.
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Abstract
An uninterruptible power supply utilizes a switching circuit which under normal operation modulates at a high frequency a signal provided by a commercial AC line to control the energy flow through a transformer between an input accepting the AC line source and a rectified DC output. The switching circuit which performs the modulation is optimally arranged to be coupled to a reserve energy source such as a charge storage capacitor or battery. It operates upon failure of the AC signal input to provide energy from the reserve source to the load by operating as a switching regulator.
32 Citations
10 Claims
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1. In an uninterruptible power supply:
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a power coupling medium having a first input to accept a periodic signal source; a rectifier coupled to rectify signals transmitted by the power coupling medium; said uninterruptible power supply characterized by a switching device coupled to the rectifier and to an output of the power coupling medium and operative to disable the power coupling medium; said switching device being further coupled to a second input to accept a nonperiodic signal source and operative to invert the nonperiodic signal source at the second input upon diminution of the periodic signal source. - View Dependent Claims (2, 3, 4)
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5. A power supply circuit comprising:
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an inductive power coupling medium including an input winding to accept an AC power signal and an output winding; a rectifier coupled to the output winding; a switch coupled to shunt at least a portion of the output winding and a diode of the rectifier permitting it to short a signal flow through an active portion of the output winding by completing a closed circuit path through an active rectifying diode; an input terminal to accept a reserve voltage source coupled to a first terminal of the switch; an energy storage inductor coupled to a second terminal of the switch and further coupled to an output terminal of the power supply through a diode, whereby periodic operation of the switch periodically disables the power coupling medium and is further operative to invert power supplied by the reserve voltage source. - View Dependent Claims (6, 7)
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8. An uninterruptible power supply comprising:
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an inductive power coupling medium including input means and output means; the input means adapted to receive an AC power signal; rectifying means coupled to the output means; and switch means connected to shunt at least a portion of the output means and the rectifying means and functioning to render the power coupling medium periodically inoperative; said switch means being driven at a frequency substantially higher than the frequency of an AC power signal applied to the input means, and operative to disable any flow of a power signal through the power coupling medium; and means to accept an auxiliary DC power source and said switch means being further coupled to invert a DC signal applied to said means to accept an auxiliary power source in order to supply energy to said output means. - View Dependent Claims (9, 10)
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Specification