Single stage power converter and method of operation thereof
First Claim
1. A single stage power converter, couplable via a rectifier to a source of AC power, having a filter capacitor and an isolation transformer with a primary winding and comprising:
- a significant energy storage device coupled to said primary winding;
a first switch, coupled to said primary winding, that conducts intermittently to couple said primary winding to said rectifier to transfer a portion of rectified AC power to a magnetizing inductance of said isolation transformer; and
a second switch, coupled between said primary winding and said significant energy storage device, that conducts alternately with said first switch, said first and second switches substantially zero-voltage switching and said converter correcting a power factor of said AC power.
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Accused Products
Abstract
A single stage power converter, a method of processing rectified AC power, and a power supply incorporating the converter or the method. In one embodiment, the converter is couplable via a rectifier to a source of AC power, has a filter capacitor and an isolation transformer with a primary winding, and includes: (1) a significant energy storage device coupled to the primary winding, (2) a first switch, coupled to the primary winding, that conducts intermittently to couple the primary winding to the rectifier to transfer a portion of rectified AC power to a magnetizing inductance of the isolation transformer and (3) a second switch, coupled between the primary winding and the significant energy storage device, that conducts alternately with the first switch, the first and second switches substantially zero-voltage switching and the converter correcting a power factor of the AC power.
29 Citations
20 Claims
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1. A single stage power converter, couplable via a rectifier to a source of AC power, having a filter capacitor and an isolation transformer with a primary winding and comprising:
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a significant energy storage device coupled to said primary winding; a first switch, coupled to said primary winding, that conducts intermittently to couple said primary winding to said rectifier to transfer a portion of rectified AC power to a magnetizing inductance of said isolation transformer; and a second switch, coupled between said primary winding and said significant energy storage device, that conducts alternately with said first switch, said first and second switches substantially zero-voltage switching and said converter correcting a power factor of said AC power. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. For use with a single stage power converter couplable via a rectifier to a source of AC power and having a filter capacitor, an isolation transformer with a primary winding, a method of processing rectified AC power in said converter, comprising:
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causing a first switch, coupled to said primary winding, to conduct intermittently to couple said primary winding to said rectifier to transfer a portion of said rectified AC power to a magnetizing inductance of said isolation transformer; and causing a second switch, coupled between said primary winding and a significant energy storage device, to conduct alternately with said first switch, said first and second switches substantially zero-voltage switching and said converter correcting a power factor of said AC power. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A power supply, comprising:
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a single stage power converter, couplable via a rectifier to a source of AC power, having a filter capacitor and an isolation transformer with a primary winding and first and second secondary windings, said converter including; a significant energy storage device coupled to said primary winding; a first switch, coupled to said primary winding, that conducts intermittently to couple said primary winding to said rectifier to transfer a portion of rectified AC power to a magnetizing inductance of said isolation transformer; and a second switch, coupled between said primary winding and said significant energy storage device, that conducts alternately with said first switch, said first and second switches substantially zero-voltage switching and said converter correcting a power factor of said portion of said AC power; a post-regulator coupled in series with a main output of said converter, that enhances a regulation of an output of said power supply; and a controller coupled to said first and second switches. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification