Constant phase angle control for frequency agile power switching systems
First Claim
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1. A system, comprising:
- a voltage controlled oscillator configured to generate an output;
a current transformer configured to receive the output of the voltage controlled oscillator;
a phase detector having a first input and a second input and being configured to receive at the first input a signal from the current transformer and to receive at the second input the output from the voltage controlled oscillator;
a voltage source configured to produce a desired output voltage; and
a differential amplifier having (i) a first input configured to receive an output from the phase detector and (ii) a second input configured to receive the output voltage from the voltage source, whereinthe differential amplifier is configured to output a voltage that corresponds to the difference between the output of the phase detector and the output of the voltage source, andthe output of the differential amplifier is provided to an input of the voltage controlled oscillator.
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Abstract
Power switching systems often benefit from controlling the instant at which the power devices change state so as to minimize dissipation in these devices. Such systems often require fairly tight tolerances on reactive components and a relatively narrow frequency operating range to be certain these switching times occur as intended. This invention defines a system that can adapt the required switching instant over very wide changes in the reactive components.
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Citations
20 Claims
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1. A system, comprising:
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a voltage controlled oscillator configured to generate an output; a current transformer configured to receive the output of the voltage controlled oscillator; a phase detector having a first input and a second input and being configured to receive at the first input a signal from the current transformer and to receive at the second input the output from the voltage controlled oscillator; a voltage source configured to produce a desired output voltage; and a differential amplifier having (i) a first input configured to receive an output from the phase detector and (ii) a second input configured to receive the output voltage from the voltage source, wherein the differential amplifier is configured to output a voltage that corresponds to the difference between the output of the phase detector and the output of the voltage source, and the output of the differential amplifier is provided to an input of the voltage controlled oscillator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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using a voltage controlled oscillator to generate a first signal; providing the first signal to a current transformer, wherein the current transformer produces a second signal; receiving at a first input of a phase detector the signal output from the current transformer; receiving at a second input of the phase detector the signal output from the voltage controlled oscillator; using an voltage source to produce a desired output; producing a voltage that corresponds to the difference between an output of the phase detector and the output of the voltage source; and providing said produced voltage to an input of the voltage controlled oscillator. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification