Power supply apparatus having high power-factor and low distortion-factor characteristics
First Claim
1. A power supply apparatus comprising:
- a rectification device for rectifying an input voltage from an AC power source and outputting a nonsmoothed DC voltage from a pair of output terminals;
first and second switching devices connected in series between the pair of output terminals of said rectification device, and alternately turning on/off at a frequency higher than a frequency of the AC power source;
a series circuit, including a first capacitor and an inductor, connected between two terminals of said first switching device, for smoothing the nonsmoothed DC voltage output from said rectification device;
a second capacitor configured to resonate with said inductor in accordance with ON/OFF operations of said first and second switching devices; and
an output circuit for obtaining a high-frequency output on a basis of the resonance caused by said inductor and said second capacitor.
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Accused Products
Abstract
A rectification device rectifies an input voltage from an AC power source. First and second switching devices are arranged between a pair of output terminals of the rectification device and alternately turned on/off. A series circuit of a first capacitor and an inductor is arranged between the two terminals of one of the first and second switching devices so as to perform a smoothing operation with respect to the frequency of an output from the rectification device. A second capacitor serves to form a resonance circuit in cooperation with the inductor in accordance with the ON/OFF operations of the first and second switching devices. The capacitance of the second capacitor is smaller than that of the first capacitor.
60 Citations
29 Claims
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1. A power supply apparatus comprising:
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a rectification device for rectifying an input voltage from an AC power source and outputting a nonsmoothed DC voltage from a pair of output terminals; first and second switching devices connected in series between the pair of output terminals of said rectification device, and alternately turning on/off at a frequency higher than a frequency of the AC power source; a series circuit, including a first capacitor and an inductor, connected between two terminals of said first switching device, for smoothing the nonsmoothed DC voltage output from said rectification device; a second capacitor configured to resonate with said inductor in accordance with ON/OFF operations of said first and second switching devices; and an output circuit for obtaining a high-frequency output on a basis of the resonance caused by said inductor and said second capacitor. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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2. A power supply apparatus comprising:
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a rectification device for rectifying an input voltage from an AC power source and outputting a non-smoothed DC voltage from a pair of output terminals; first and second switching devices connected in series between the pair of output terminals of said rectification device, and alternately turning on/off at a frequency higher than a frequency of the AC power source; a first capacitor having a relatively large capacitance connected in parallel to said first switching device; an inductor connected in series between said first switching device and said first capacitor; and a second capacitor having a capacitance smaller than that of said first capacitor, and configured to resonate with said inductor in an ON period of said second switching device; and an output circuit for obtaining a high-frequency output on a basis of the resonance caused by said inductor and said second capacitor.
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15. A power supply apparatus comprising:
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a rectification device for rectifying an AC voltage and outputting a non-smoothed DC voltage; first and second switching devices connected in series and alternately turning on/off at a frequency higher than a frequency of said AC voltage; a first capacitor connected in parallel to said first switching device, said first capacitor being charged by an output from said rectification device via said second switching device during an ON period of said second switching device so as to perform a smoothing operation with respect to a frequency of an output from said rectification device, and said first capacitor being discharged via said first switching device during an ON period of said first switching device; an inductor coupled between a node of said first and second switching devices and said first capacitor, and allowing a charge current and a discharge current to pass to/from said first capacitor; a second capacitor configured to resonate with said inductor in accordance with ON/OFF operations of said first and second switching devices; a control unit for controlling the ON period of said first switching device in accordance with a value of a discharge current discharged from said first capacitor and flowing in said first switching device so as to control a value of a resonance voltage generated by said inductor and said second capacitor; and an output circuit for obtaining a high-frequency output on a basis of the resonance caused by said inductor and said second capacitor. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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16. A power supply apparatus comprising:
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a rectification device having a pair of output terminals and connected to an AC power source; first and second switching devices connected in series between said pair of output terminals of said rectification device, and turning on/off at a frequency higher than a frequency of the AC power source; a series circuit of a first capacitor having a relatively large capacitance and an inductor, said series circuit connected in parallel across said first switching device; a second capacitor having a relatively small capacitance and arranged to form a resonance circuit with said inductor in accordance with ON/OFF operations of said first and second switching devices; a control unit having a detection means for detecting a current flowing in said first switching device, and controlling an ON period of said first switching device in accordance with a detection signal from said current detection means; and an output circuit for obtaining a high-frequency output on a basis of resonance caused by said inductor and said second capacitor.
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29. A power supply apparatus comprising:
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a rectification means having input and output sides; first and second switching elements connected in series across the output side of said rectification means; a circuit, comprising, a load, smoothing capacitor means having a relatively large capacitances, and induction means to which a load is connected, said circuit being connected in series with one of said first and second switching elements; and resonance capacitor means, having a capacitance smaller than that of said smoothing capacitor means, for forming a resonance circuit in cooperation with said induction means.
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Specification