Uninterruptible power supply
First Claim
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1. A variable voltage power supply comprising:
- power source means;
voltage output means connectable between said power source means and a load, said voltage output means when connected to the load providing an AC output voltage therefor and electrical energy transfer between said power source and the load;
electronic switching means comprising first and second switching means each coupled to said power source means and said voltage output means;
reference source means comprising an AC source and means for producing from alternate half cycles thereof, respectively, first and second reference waveforms;
voltage comparator means comprising first comparator means for comparing said first reference waveform with one phase of said AC output voltage and a second comparator means for comparing said second waveform with the opposite phase of said AC output voltage, said first comparator means being operatively coupled to said first switching means so as to produce switching thereof that causes said output voltage to track said first waveform and said second comparator means being operatively coupled to said second switching means so as to produce switching thereof that causes said output voltage to track said second waveform; and
electrical energy storage means coupled to said voltage output means and storing energy provided by said source means during said switching of said first and second switching means.
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Abstract
A variable voltage power supply including a power source connected to an electrical energy storage means by an electronic switching means. Coupled to the energy storage means is a voltage output circuit providing an output voltage for a load and electrical energy transfer thereto from the energy storage means. A voltage comparator compares the output voltage with a periodically varying reference voltage providing output signals that switch the electronic switching means to cause the output voltage to track the reference voltage.
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Citations
21 Claims
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1. A variable voltage power supply comprising:
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power source means; voltage output means connectable between said power source means and a load, said voltage output means when connected to the load providing an AC output voltage therefor and electrical energy transfer between said power source and the load; electronic switching means comprising first and second switching means each coupled to said power source means and said voltage output means; reference source means comprising an AC source and means for producing from alternate half cycles thereof, respectively, first and second reference waveforms; voltage comparator means comprising first comparator means for comparing said first reference waveform with one phase of said AC output voltage and a second comparator means for comparing said second waveform with the opposite phase of said AC output voltage, said first comparator means being operatively coupled to said first switching means so as to produce switching thereof that causes said output voltage to track said first waveform and said second comparator means being operatively coupled to said second switching means so as to produce switching thereof that causes said output voltage to track said second waveform; and electrical energy storage means coupled to said voltage output means and storing energy provided by said source means during said switching of said first and second switching means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification