Dual-mode power converter
First Claim
1. A dual-mode power converter, comprising:
- switchmode power converter means for converting and delivering power from an AC input to a DC output;
conduction mode means for delivering power directly from said AC input to said DC output; and
control means for controlling operation of said switchmode power converter means and said conduction mode means as a function of said power delivered to said DC output.
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Accused Products
Abstract
An efficient off-line rectified, high-power, AC-to-DC power supply is provided. High-power factor and minimal circuit size, cost, and complexity are achieved by combining switchmode power converter operation as well as conduction-mode operation. The switchmode power converter is controlled such that only a fraction of the output power is converted by the switchmode power converter. Peak power is efficiently conducted directly from an AC line to a DC output without requiring the operation of the switchmode power converter. Such control method results in high efficiency, yet also maintains a high-power factor with optimally sized, cost-effective switchmode power converter electronics. A complete, self-contained system is provided including a soft-start, full-wave bridge.
45 Citations
20 Claims
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1. A dual-mode power converter, comprising:
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switchmode power converter means for converting and delivering power from an AC input to a DC output; conduction mode means for delivering power directly from said AC input to said DC output; and control means for controlling operation of said switchmode power converter means and said conduction mode means as a function of said power delivered to said DC output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A dualmode power converter, comprising:
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switchmode power converter means for converting and delivering power from an AC input to a DC output; conduction mode means for delivering power directly from said AC input to said DC output; and control means for controlling operation of said switchmode power converter means and said conduction mode means as a function of said power delivered to said DC output, wherein said switchmode power converter means comprises an inductor and a diode connected in series between said AC input and said DC output, and said conduction mode means comprises a diode connected in parallel across said inductor and said diode.
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12. A dualmode power converter, comprising:
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switchmode power converter means for converting and delivering power from an AC input to a DC output; conduction mode means for delivering power directly from said AC input to said DC output; and control means for controlling operation of said switchmode power converter means and said conduction mode means as a function of said power delivered to said DC output, wherein said switchmode power converter means comprises an inductor and a diode connected in series between said AC input and said DC output, and said conduction mode means comprises said inductor and said diode at times which said switchmode power converter means is disabled by said control means.
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13. A dual-mode power converter, comprising:
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switchmode power converter means for converting and delivering power from an AC input to a DC output when said dual-mode power converter is in a switchmode operating mode; conduction mode means for delivering power directly from said AC input to said DC output when said dual-mode power converter is in a conduction operating mode; and control means for selectively causing said dual-mode power converter to operate according to said switchmode operating mode and said conduction operating mode as a function of a level of power delivered to said DC output. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method of controlling a dual-mode power converter including a switchmode power converter connected between an AC input and a DC output for converting and delivering power from said AC input to said DC output, and a conduction path connected between said AC input and said DC output for delivering power directly from said AC input to said DC output, said method comprising the steps of:
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monitoring said power delivered to said DC output; activating said switchmode power converter when said power delivered to said DC output is below a predetermined level, whereby said switchmode power converter delivers said power to said, DC output; and disabling said switchmode power converter when said power delivered to said DC output is above said predetermined level, whereby said conduction path delivers said power to said DC output. - View Dependent Claims (20)
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Specification