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US 11,437,917 B2Granted
Predictive synchronous rectifier sensing and control
AssigneeTexas Instruments Incorporated
InventorsSheng-Yang Yu, Manish Bhardwaj
Life of this patent
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Abstract
For predictive synchronous rectifier sensing and control, an example apparatus includes an air core toroid having a voltage output, the air core toroid adapted to surround a portion of a current path and adapted to be coupled through the current path to a transformer, and a control logic circuit having a voltage input and a control output, the voltage input coupled to the voltage output, and the control output adapted to be coupled to a switch.
Claims18
An apparatus comprising:
- a Rogowski coil having a voltage output;
- and
- a control circuit including:
- an integrator circuit having a voltage input and an integrator output, the voltage input coupled to the voltage output;
- a gain amplifier circuit having an integrator input and an amplifier output, the integrator input coupled to the integrator output;
- a slope detection circuit having a first amplifier input and a detection output, the first amplifier input coupled to the amplifier output;
- and
- a switch control circuit having a second amplifier input, a detection input and a switch control output, the second amplifier input coupled to the amplifier output, and the detection input coupled to the detection output.
5 more elements
An apparatus comprising:
- an air core toroid having first and second voltage outputs;
- and
- a control circuit including:
- an integrator circuit having an integrator output and first and second voltage inputs, the first and second voltage inputs respectively coupled to the first and second voltage outputs;
- a gain amplifier circuit having an integrator input and an amplifier output, the integrator input coupled to the integrator output;
- and
- a switch control circuit having an amplifier input and a switch control output, the amplifier input coupled to the amplifier output, in which the switch control circuit includes a blanking circuit having a blanking output.
4 more elements
A power converter comprising:
- a transformer having a first winding and a second winding;
- a current path coupled to the second winding;
- a network including first and second switches, the first and second switches coupled to the second winding;
- a Rogowski coil having a voltage output, the Rogowski coil around a portion of the current path;
- and
- a control circuit having a voltage input and a control output, the voltage input coupled to the voltage output, and the control output coupled to the first and second switches, in which the control circuit is configured to control the first and second switches based on the voltage input, and the control circuit includes an integrator circuit configured to provide an integrator output voltage having a first phase different from a second phase of the voltage input.
3 more elements
A method comprising:
- determining a first counter value responsive to a first voltage satisfying a first threshold, the first voltage based on a first output voltage sensed by a Rogowski coil arranged around a current path of a power converter;
- determining a second counter value responsive to a second voltage satisfying a second threshold, the second voltage based on a second output voltage sensed by the Rogowski coil;
- and
- controlling a switch of the power converter based on a difference between the first counter value and the second counter value.
1 more element
Dependencies are inferred from the claim text.