Power factor correction circuit for a power supply
First Claim
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1. A switching power supply, comprising:
- an AC-to-DC converting device that converts an AC input line voltage to a DC voltage;
an energy storage device that stores a DC voltage that is lower than a peak value of said AC input line voltage, said DC voltage stored in said energy storage device being released to a load during a period when a rectified AC input line voltage is lower than said DC voltage; and
an auxiliary power factor corrector that operates, upon a release of said DC voltage stored in said energy storage device, to shape an AC input line current during said period.
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Abstract
A power factor correction circuit, usable with, for example, a switching power supply of a discharge lamp. The power factor correction circuit includes a shaping system that shapes an input current of a power line during a predetermined period proximate a zero line crossing point of the input current; and a minimizing system that minimizes a pulsating of the input current.
35 Citations
23 Claims
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1. A switching power supply, comprising:
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an AC-to-DC converting device that converts an AC input line voltage to a DC voltage; an energy storage device that stores a DC voltage that is lower than a peak value of said AC input line voltage, said DC voltage stored in said energy storage device being released to a load during a period when a rectified AC input line voltage is lower than said DC voltage; and an auxiliary power factor corrector that operates, upon a release of said DC voltage stored in said energy storage device, to shape an AC input line current during said period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A switching power supply, comprising:
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a rectifying device that receives an AC input line voltage and outputs a DC voltage; a switching converter that receives the AC input line voltage during a predetermined period and provides electrical power to an operating device; a valley-fill circuit that includes an energy storage device to store a DC voltage that is lower than a peak value of said AC input line voltage, said DC voltage stored in said energy storage device being released to said switching converter during a period of time when a rectified AC input line voltage is lower than said DC voltage; and an auxiliary power factor corrector that operates, upon a release of said DC voltage stored in said energy storage device, to shape an AC input line current during said period of time. - View Dependent Claims (20, 21, 22)
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23. A method for supplying power with a power factor correction, comprising:
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converting an AC input line voltage to a DC voltage; using a valley-fill circuit to store a DC voltage that is lower than a peak voltage of said AC input line voltage, the stored DC voltage being released to a load during a period of time when a rectified AC input line voltage is lower than the DC voltage; and employing an auxiliary power factor corrector to shape an AC input line current upon the release of the stored DC voltage.
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Specification