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US 10,122,259 B2Granted
Over power protection for power converter
AssigneeSemiconductor Components Industries, LLC
InventorsVaclav Drda, Roman Stuler
Life of this patent
Estimating the term…
Abstract
A power conversion circuit is provided. A power level of the power conversion circuit is determined by taking a first sample of a voltage potential of a resonant capacitor at a first time. A second sample of the voltage potential of the resonant capacitor voltage is taken at a second time. An electric current is determined based on the first sample and second sample.
Claims20
A power conversion circuit, comprising:
- an average current circuit including an input coupled for receiving a sampling signal representative of a current through a primary winding, wherein the average current circuit measures the sampling signal at a first time and a second time;
- a power level circuit including a first input coupled to an output of the average current circuit and a second input coupled for receiving an input voltage of the power conversion circuit to determine an input power of the power conversion circuit as a product of the input voltage and a difference between the measurements of the sampling signal at the first time and second time;
- a first amplifier including a first input coupled for receiving a power reference and a second input coupled to an output of the power level circuit;
- a variable feedback clamp including a control input coupled to an output of the first amplifier;
- and
- a second amplifier including a first input coupled for receiving the sampling signal and a second input coupled to the variable feedback clamp and further coupled for receiving a feedback signal of the power conversion circuit.
3 more elements
A power conversion circuit, comprising:
- an average current circuit including an input coupled for receiving a sampling signal representative of a current through a primary winding, wherein the average current circuit measures the sampling signal at a first time and a second time;
- and
- a power level circuit including a first input coupled to an output of the average current circuit and a second input coupled for receiving an input voltage of the power conversion circuit to determine an input power of the power conversion circuit as a product of the input voltage and a difference between the measurements of the sampling signal at the first time and second time.
A method of determining an input power for a power conversion circuit, comprising:
- measuring a sampling signal representative of a current through a primary winding at a first time and a second time;
- and
- determining the input power as a product of an input voltage of the power conversion circuit and a difference between the measurements of the sampling signal at the first time and second time.
Dependencies are inferred from the claim text.