Secondary side control of resonant DC/DC converters
First Claim
1. A secondary-side rectification and regulation circuit, comprising:
- a secondary-side transformer winding;
a full-wave rectifier having a first pair of controllable rectifiers comprising a first transistor connected to a first terminal of the secondary-side transformer winding and a second transistor connected to a second terminal of the secondary-side transformer winding; and
a control unit operable to control switching of the transistors of the full-wave rectifier so that the full-wave rectifier (a) generates a rectified output for supplying a load by rectifying current through the secondary-side transformer winding or voltage across the secondary-side transformer winding and (b) regulates the rectified output,wherein the control unit is operable to control the switching of the first transistor based on a trailing-edge PWM (pulse width modulation) signal synced to a resonant current or voltage waveform for the secondary-side transformer winding, and control the switching of the second transistor based on a leading-edge PWM signal synced to the resonant current or voltage waveform.
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Accused Products
Abstract
A secondary-side rectification and regulation circuit includes a secondary-side transformer winding, a full-wave rectifier circuit and a control unit. The full-wave rectifier has a first pair of controllable rectifiers including a first transistor connected to a first terminal of the secondary-side transformer winding and a second transistor connected to a second terminal of the secondary-side transformer winding. The control unit is operable to control switching of the transistors of the full-wave rectifier so that the full-wave rectifier (a) generates a rectified output for supplying a load by rectifying current through the secondary-side transformer winding or voltage across the secondary-side transformer winding and (b) regulates the rectified output.
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Citations
20 Claims
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1. A secondary-side rectification and regulation circuit, comprising:
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a secondary-side transformer winding; a full-wave rectifier having a first pair of controllable rectifiers comprising a first transistor connected to a first terminal of the secondary-side transformer winding and a second transistor connected to a second terminal of the secondary-side transformer winding; and a control unit operable to control switching of the transistors of the full-wave rectifier so that the full-wave rectifier (a) generates a rectified output for supplying a load by rectifying current through the secondary-side transformer winding or voltage across the secondary-side transformer winding and (b) regulates the rectified output, wherein the control unit is operable to control the switching of the first transistor based on a trailing-edge PWM (pulse width modulation) signal synced to a resonant current or voltage waveform for the secondary-side transformer winding, and control the switching of the second transistor based on a leading-edge PWM signal synced to the resonant current or voltage waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of rectification and regulation using a circuit including a full-wave rectifier having a first pair of controllable rectifiers comprising a first transistor connected to a first terminal of a secondary-side transformer winding and a second transistor connected to a second terminal of the secondary-side transformer winding, the method comprising:
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switching the transistors of the full-wave rectifier so that the full-wave rectifier generates a rectified output for supplying a load by rectifying current through the secondary-side transformer winding or voltage across the secondary-side transformer winding; and switching the transistors of the full-wave rectifier to regulate the rectified output, wherein the first transistor is switched based on a trailing-edge PWM (pulse width modulation) signal synced to a resonant current or voltage waveform for the secondary-side transformer winding, wherein the second transistor is switched based on a leading-edge PWM signal synced to the resonant current or voltage waveform. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. An electronic system, comprising:
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a load; a secondary-side transformer winding; a full-wave rectifier coupling the secondary-side transformer winding to the load and comprising a first pair of controllable rectifiers including a first transistor connected to a first terminal of the secondary-side transformer winding and a second transistor connected to a second terminal of the secondary-side transformer winding; and a control unit operable to control switching of the transistors of the full-wave rectifier so that the full-wave rectifier (a) generates a rectified output for supplying the load by rectifying current through the secondary-side transformer winding or voltage across the secondary-side transformer winding and (b) regulates the rectified output, wherein the control unit is operable to control the switching of the first transistor based on a trailing-edge PWM (pulse width modulation) signal synced to a resonant current or voltage waveform for the secondary-side transformer winding, and control the switching of the second transistor based on a leading-edge PWM signal synced to the resonant current or voltage waveform.
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Specification