Soft transition converter
First Claim
1. A soft transition power converter, comprising:
- a transformer having a primary winding and a secondary winding forming at least part of a power output side of the power converter;
an alternating current source, comprising a source of DC current and a set of switching elements electrically connecting said source of DC current to said primary winding for producing alternating current in said secondary winding;
a rectifier circuit having an alternating current input for receiving said alternating current and producing a rectified current output at said power output side of the power converter;
a soft transition inductor electrically connecting said source and said primary winding; and
a source controller adapted to produce said alternating current by alternating the voltage across said secondary winding from one of a negative ON time during which said voltage is negative and a positive ON time during which said voltage is positive, to a dead time wherein the voltage is substantially zero, and then to the other of said negative ON time and said positive ON time.
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Accused Products
Abstract
The present invention is a circuit and method for reducing switching and reverse recovery losses in the output rectifiers while creating zero voltage switching conditions for the primary switchers. There are described two output configurations, one employing a soft commutation inductor element a bridge rectifier and a output filter capacitor, the second using a soft commutation inductor element a rectification-filtering bridge composed by two capacitors and two capacitors. Both secondary circuits can be driven by three primary circuits. A first circuit is a full bridge with phase shift control, and a second circuit is a half bridge topology with an additional bydirectional switch which achieves two goals, on to get soft switching commutation across all the primary switches, the second to create the right waveforms in the secondary suitable with the claims in this invention. The third topology is a phase shifted two transistors forward. The circuits claimed in this invention can provide soft commutation across the primary switching elements and secondary rectifier means, clamping the voltage across the rectifiers to the output voltage eliminating the need for snubbers circuits both in primary and the secondary section.
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Citations
54 Claims
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1. A soft transition power converter, comprising:
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a transformer having a primary winding and a secondary winding forming at least part of a power output side of the power converter;
an alternating current source, comprising a source of DC current and a set of switching elements electrically connecting said source of DC current to said primary winding for producing alternating current in said secondary winding;
a rectifier circuit having an alternating current input for receiving said alternating current and producing a rectified current output at said power output side of the power converter;
a soft transition inductor electrically connecting said source and said primary winding; and
a source controller adapted to produce said alternating current by alternating the voltage across said secondary winding from one of a negative ON time during which said voltage is negative and a positive ON time during which said voltage is positive, to a dead time wherein the voltage is substantially zero, and then to the other of said negative ON time and said positive ON time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A soft transition power converter, comprising:
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a transformer having a primary winding and a secondary winding forming at least part of a power output side of the power converter;
an alternating current source, comprising a source of DC current and a set of switching elements electrically connecting said source of DC current to said primary winding for producing alternating current in said secondary winding;
a rectifier circuit having an alternating current input for receiving said alternating current and producing a rectified current output at said power output side of the power converter;
a first soft transition inductor electrically connecting said secondary winding and said alternating current input of said rectifier circuit; and
a source controller adapted for controlling said alternating current source so as to produce said alternating current by alternating the voltage across said primary winding a first active time during which the voltage is one of positive and negative, thence to a dead time during which the voltage is substantially zero, and thence to a second active time during which the voltage is the other of positive and negative. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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- 53. A method for converting power in a power converter that includes a transformer having a primary winding and a secondary winding, a source connected to said primary winding and adapted to produce alternating electrical current in said secondary winding, a rectifier circuit for receiving and rectifying said alternating electrical current, and at least one soft transition inductor, the method comprising controlling said source so as to produce said alternating current by alternating the voltage across said primary winding a first active time during which the voltage is one of positive and negative, thence to a dead time during which the voltage is substantially zero, and thence to a second active time during which the voltage is the other of positive and negative.
Specification