Class E amplifier with inductive clamp
First Claim
1. A power supply circuit for supplying alternating power to a load, comprising:
- a source of direct current (DC) voltage;
a single ended inverter, the single ended inverter receiving the DC input voltage and generating an alternating current (AC) output signal;
a first harmonic filter at the output of the inverter, the first harmonic filter filtering out predetermined harmonic components of the AC signal to generate a filtered AC signal; and
an output circuit at the output of the first harmonic filter for receiving the filtered AC signal and feeding the filtered AC signal to a load, wherein the output circuit includes a rectifier connected relative to a point in the output circuit such that if the voltage at the point exceeds a predetermined threshold, the rectifier conducts to cause at least one of voltage and current to return to the source of DC voltage and clamps the point to a predetermined voltage.
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Accused Products
Abstract
A power supply including an inverter receiving a DC input signal from a DC input source (11). The inverter is comprised of two half bridges (S1 A, S2A and S1B, S2B). Each inverter is driven by a signal source (13A, 13B), which outputs an AC signal. The output from each inverter is input to a first stage harmonic filter. The power supply includes an output circuit that includes first and second rectifiers (D1, D2) arranged about a point so that if the inverter attempts to drive the point beyond a predetermined first and second voltage, the respective rectifier conducts in order to return at least one of power and current to the DC input source. The output from the first harmonic filter (L1A, C1; L1B, C1) is output to a second harmonic filter (L2, C2) and is then output from the power supply.
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Citations
21 Claims
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1. A power supply circuit for supplying alternating power to a load, comprising:
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a source of direct current (DC) voltage;
a single ended inverter, the single ended inverter receiving the DC input voltage and generating an alternating current (AC) output signal;
a first harmonic filter at the output of the inverter, the first harmonic filter filtering out predetermined harmonic components of the AC signal to generate a filtered AC signal; and
an output circuit at the output of the first harmonic filter for receiving the filtered AC signal and feeding the filtered AC signal to a load, wherein the output circuit includes a rectifier connected relative to a point in the output circuit such that if the voltage at the point exceeds a predetermined threshold, the rectifier conducts to cause at least one of voltage and current to return to the source of DC voltage and clamps the point to a predetermined voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 15, 16, 17, 19)
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8. A power supply circuit for supplying alternating power to a load, comprising:
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a source of direct current (DC) voltage;
a pair of single ended inverters for receiving the DC input voltage and for generating an alternating current (AC) output signal, the single ended inverters being arranged in a push-pull configuration;
a first harmonic filter at the output of each single ended inverter, the first harmonic filter filtering out predetermined harmonic components of the AC signal to generate a filtered AC signal; and
an output circuit at the output of the first harmonic filter for receiving the filtered AC signal and feeding the filtered AC signal to a load, wherein the output circuit includes a rectifier connected relative to a point in the output circuit such that if the voltage at the point exceeds a predetermined threshold, the rectifier conducts to cause at least one of voltage and current to return to the source of DC voltage and clamps the point to a predetermined voltage. - View Dependent Claims (14, 20)
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18. A plasma control system comprising:
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a plasma chamber excited by a radio frequency (RF) signal;
a plasma controller for measuring operating conditions of the plasma chamber and generating control signals for varying conditions within the plasma chamber; and
a RF generator for generating an RF signal to the plasma chamber, the RF generator including;
a RF controller, the RF controller receiving the control signal from the plasma controller and generating a power supply control signal, and a power supply for receiving the power supply control signal and generating a RF signal in accordance with the power supply control signal, wherein the power supply includes a protection circuit including a rectifier connected relative to a predetermined point such that such that if the voltage at the point exceeds a predetermined threshold, the rectifier conducts to clamp the voltage at the point to a predetermined voltage.
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21. A power supply circuit for supplying alternating power to a load, comprising:
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a source of direct current (DC) voltage;
a single ended inverter for receiving the DC input voltage and for generating an alternating current (AC) output signal for input to a load;
an output circuit at the output of the inverter; and
a dissipation circuit connected to a point in the output circuit such that if the voltage at the point exceeds a predetermined threshold, the dissipation circuit conducts to cause at least one of voltage and current to dissipate and clamps the point to a predetermined voltage.
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Specification