Interleaved synchronous flyback converter with high efficiency over a wide operating load range
First Claim
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1. A switching power supply, comprising:
- first and second power converter stages coupled in parallel, each of said converter stages comprising;
a transformer having a primary winding and a secondary winding;
a primary-side power switch connected in series to said primary winding of said transformer; and
a secondary-side power switch connected in series to said secondary winding of said transformer;
wherein when an output power of said first and second power converter stages is below a first power level, said first power converter stage operates in a hard-switching mode and said second power converter stage is off;
wherein when an output power of said first and second power converter stages is greater than said first power level and less than a second power level, said first power converter stage operates in a soft-switching mode and said second power converter stage is off;
wherein when an output power of said first and second power converter stages is greater than said second power level, said first power converter stage operates in a soft-switching mode and said second power converter stage operates in a soft-switching mode.
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Abstract
The present invention provides a switching power supply which operates at a high efficiency over a wide operating load range. When the output power is below a first power level, the first power converter stage operates in a hard-switching mode and the second power converter stage is off. When the output power is greater than the first power level and less than a second power level, the first power converter stage operates in a soft-switching mode and the second power converter stage is off. When an output power is greater than the second power level, the first power converter stage operates in a soft-switching mode and the second power converter stage operates in a soft-switching mode.
60 Citations
11 Claims
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1. A switching power supply, comprising:
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first and second power converter stages coupled in parallel, each of said converter stages comprising; a transformer having a primary winding and a secondary winding; a primary-side power switch connected in series to said primary winding of said transformer; and a secondary-side power switch connected in series to said secondary winding of said transformer; wherein when an output power of said first and second power converter stages is below a first power level, said first power converter stage operates in a hard-switching mode and said second power converter stage is off; wherein when an output power of said first and second power converter stages is greater than said first power level and less than a second power level, said first power converter stage operates in a soft-switching mode and said second power converter stage is off; wherein when an output power of said first and second power converter stages is greater than said second power level, said first power converter stage operates in a soft-switching mode and said second power converter stage operates in a soft-switching mode. - View Dependent Claims (2, 3, 4)
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5. A switching power supply, comprising:
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a first power converter comprising; a transformer having a primary winding and a secondary winding; a primary-side power switch connected in series to said primary winding of said transformer; and a secondary-side power switch connected in series to said secondary winding of said transformer; wherein when an output power of said first power converter stage is below a first power level, said first power converter stage operates in a hard-switching mode; wherein when an output power of said first power converter stage is greater than said first power level, said first power converter stage operates in a soft-switching mode. - View Dependent Claims (6, 7, 8)
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9. A switching power supply, comprising:
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first and second power converter stages coupled in parallel, each of said converter stages comprising; a transformer having at least one primary winding and at least one secondary winding; at least one primary-side power switch connected in series to said primary winding of said transformer; and at least one secondary-side power switch connected in series to said secondary winding of said transformer; wherein each power stage is operable in an operating mode dependent on an output power of said two power stages, wherein said operating mode is one of;
a soft-switching mode, a hard-switching mode, and an OFF mode. - View Dependent Claims (10, 11)
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Specification