Full-bridge lossless switching converter
First Claim
1. An improved dc-to-dc converter including a transformer with primary and secondary windings wherein said transformer includes parasitic inductances such as leakage and magnetizing inductances, said converter comprising:
- an inverter having two pairs of controllable switching devices adapted to be connected in parallel across a dc supply, each of said controllable switching devices including a parasitic diode portion in inverse parallel therewith, each of said controllable switching devices further including a parasitic capacitance in parallel therewith;
a first junction between a first pair of said controllable switching devices;
a second junction between a second pair of said controllable switching devices;
the primary of said transformer being connected between said first and second junctions;
said transformer including a secondary inductively coupled to said primary, said secondary output connected to a rectifying circuit supplying a controllable voltage to a load; and
control means adapted to turn said first pair and said second pair of said controllable switching devices on and off at times which result in a substantially lossless transfer of energy between said parasitic inductances and said parasitic capacitances.
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Accused Products
Abstract
A full bridge integrable dc-to-dc converter is described which includes four FET switching devices wherein the parasitic capacitors of the switching devices exchange energy with the leakage and magnetizing inductances of the converter transformer. Since energy is exchanged between the passive components of the circuit, the switching is accomplished in a substantially lossless manner. Energy not transmitted to the load is returned to the source rather than being dissipated in the active devices of the converter. Further, single frequency operation is accomplished over a broad range of output conditions by phase shifting the converter legs relative to one another.
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Citations
13 Claims
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1. An improved dc-to-dc converter including a transformer with primary and secondary windings wherein said transformer includes parasitic inductances such as leakage and magnetizing inductances, said converter comprising:
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an inverter having two pairs of controllable switching devices adapted to be connected in parallel across a dc supply, each of said controllable switching devices including a parasitic diode portion in inverse parallel therewith, each of said controllable switching devices further including a parasitic capacitance in parallel therewith; a first junction between a first pair of said controllable switching devices; a second junction between a second pair of said controllable switching devices; the primary of said transformer being connected between said first and second junctions; said transformer including a secondary inductively coupled to said primary, said secondary output connected to a rectifying circuit supplying a controllable voltage to a load; and control means adapted to turn said first pair and said second pair of said controllable switching devices on and off at times which result in a substantially lossless transfer of energy between said parasitic inductances and said parasitic capacitances. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification