Zero voltage switching half-bridge converters
First Claim
1. A converter comprising:
- a primary switch network coupled to a power source, wherein the primary switch network comprises a plurality of power switches;
a controller configured to generate gate drive signals for the plurality of power switches;
a secondary rectifier coupled to an output;
a first transformer having a first winding coupled to the primary switch network, a second winding coupled to the secondary rectifier and a third winding coupled to the controller; and
a second transformer having a fourth winding coupled to the primary switch network, a fifth winding coupled to the secondary rectifier and a sixth winding coupled to the controller, wherein a voltage signal from the third winding or the sixth winding is processed to provide a feedback of a voltage at the output, and wherein the secondary rectifier comprises a first diode and a second diode, and wherein the second winding is connected in series with the first diode and the fifth winding is connected in series with the second diode.
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Accused Products
Abstract
A power converter comprises a primary switch network coupled to a power source, wherein the primary switch network comprises a plurality of power switches, a controller configured to generate gate drive signals for the plurality of power switches, a secondary rectifier coupled to an output, a first transformer having a first winding coupled to the primary switch network, a second winding coupled to the secondary rectifier and a third winding coupled to the controller and a second transformer having a fourth winding coupled to the primary switch network, a fifth winding coupled to the secondary rectifier and a sixth winding coupled to the controller, wherein a voltage signal from the third winding and/or the sixth winding is processed to provide a feedback of a voltage at the output.
22 Citations
19 Claims
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1. A converter comprising:
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a primary switch network coupled to a power source, wherein the primary switch network comprises a plurality of power switches; a controller configured to generate gate drive signals for the plurality of power switches; a secondary rectifier coupled to an output; a first transformer having a first winding coupled to the primary switch network, a second winding coupled to the secondary rectifier and a third winding coupled to the controller; and a second transformer having a fourth winding coupled to the primary switch network, a fifth winding coupled to the secondary rectifier and a sixth winding coupled to the controller, wherein a voltage signal from the third winding or the sixth winding is processed to provide a feedback of a voltage at the output, and wherein the secondary rectifier comprises a first diode and a second diode, and wherein the second winding is connected in series with the first diode and the fifth winding is connected in series with the second diode. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power apparatus comprising:
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a primary side circuit of a half-bridge converter having two primary switches and two capacitors; a secondary side circuit of the half-bridge converter having a first leg coupled to the primary side circuit of the half-bridge converter through a first transformer and a second leg coupled to the primary side circuit of the half-bridge converter through a second transformer, wherein a first winding of the first transformer and a first winding of the second transformer are connected in series between a common node of the two primary switches and a common node of the two capacitors; and a controller configured to generate gate drive signals for the two primary switches based upon a voltage signal detected from an auxiliary winding of one of the first transformer and the second transformer through a magnetic coupling between the auxiliary winding and the secondary side circuit of the half-bridge converter. - View Dependent Claims (8, 9, 10)
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11. A method comprising:
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providing a power converter comprising a primary side circuit having primary switches and a secondary side circuit having a first leg coupled to the primary side circuit through a first transformer and a second leg coupled to the primary side circuit through a second transformer, wherein the first transformer and the second transformer are coupled to an output, and a primary winding of the first transformer and a primary winding of the second transformer are connected in series between a common node of the primary switches and a common node of input capacitors of the power converter; and configuring a controller to sense an output voltage of the power converter through an auxiliary winding of one of the first transformer and the second transformer, wherein the auxiliary winding is electrically isolated from the secondary side circuit. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification