A.C. power supply apparatus
First Claim
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1. An a.c. power supply apparatus, comprising:
- a first controllable converting device which receives a.c. power of a first frequency from a power source, converts the frequency of said a.c. power into a second frequency higher than said first frequency, converts the voltage of said a.c. power to a value equal to a demanded system power control signal, thereby providing converted a.c. power, and provides said converted a.c. power to a bus;
a second voltage inverter type converting device which receives d.c. power and converts said d.c. power into a.c. power of said second frequency and provides said converted d.c. power to said bus, and converts a.c. power from said bus into d.c. power to charge a battery, said second converting device being responsive to a voltage control signal for controlling the voltage level of said converted a.c. and d.c. power;
a third converting device which is supplied with a.c. power of said second frequency from one of said first and second converting devices through said bus, converts the supplied power into a.c. power of a third frequency, and provides the a.c. power of said third frequency to a load; and
control means for evaluating demanded system power based on said a.c. power provided to said load and said d.c. power to charge said battery, developing said demanded system power control signal, and supplying said system power control signal to said first controllable converting device.
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Abstract
An a.c. power supply apparatus, such as an uninterruptible power supply apparatus or a fuel cell power generation apparatus, has first, second and third converting devices connected in star configuration with a common bus, whereby the number of power converting devices is reduced and a compact, light weight and efficient power supply apparatus is realized.
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Citations
8 Claims
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1. An a.c. power supply apparatus, comprising:
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a first controllable converting device which receives a.c. power of a first frequency from a power source, converts the frequency of said a.c. power into a second frequency higher than said first frequency, converts the voltage of said a.c. power to a value equal to a demanded system power control signal, thereby providing converted a.c. power, and provides said converted a.c. power to a bus; a second voltage inverter type converting device which receives d.c. power and converts said d.c. power into a.c. power of said second frequency and provides said converted d.c. power to said bus, and converts a.c. power from said bus into d.c. power to charge a battery, said second converting device being responsive to a voltage control signal for controlling the voltage level of said converted a.c. and d.c. power; a third converting device which is supplied with a.c. power of said second frequency from one of said first and second converting devices through said bus, converts the supplied power into a.c. power of a third frequency, and provides the a.c. power of said third frequency to a load; and control means for evaluating demanded system power based on said a.c. power provided to said load and said d.c. power to charge said battery, developing said demanded system power control signal, and supplying said system power control signal to said first controllable converting device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification
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Current AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
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Original AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
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InventorsSashida, Nobuo, Kawabata, Takao
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Primary Examiner(s)Stephan, Steven L.
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Assistant Examiner(s)KINCAID, KRISTINE LYNN
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Application NumberUS07/798,833Time in Patent Office491 DaysField of Search363/37, 363/98, 363/132, 307/46, 307/66, 307/67US Class Current363/37CPC Class CodesH02J 9/062 for AC powered loadsY02B 90/10 Applications of fuel cells ...
