Induction heating system with resonance detection
First Claim
1. An induction heating system comprising:
- a power switch;
a resonant heating circuit configured to be coupled to a load and configured to generate an oscillating voltage in response to a DC voltage pulse; and
a pulse initiator configured to provide a monitoring voltage having a value representative of an average value of a peak voltage of the oscillating voltage generated by the resonant heating circuit and to provide a pulse initiation signal to initiate application of a subsequent DC voltage pulse to the resonant heating circuit when the value of the monitoring voltage is substantially equal to or less than a predetermined threshold value.
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Accused Products
Abstract
An induction heating is provided. The induction heating system comprises a power switch, a resonant heating circuit, and a pulse initiator. The resonant heating circuit is configured to be coupled to a load and configured to generate an oscillating voltage in response to a DC pulse input having a DC voltage level. The pulse initiator is configured to provide a monitoring voltage having a value representative of an average value of a peak voltage of the oscillating voltage generated by the resonant heating circuit and to provide a pulse initiation signal to initiate application of a subsequent DC pulse to the resonant circuit when the value of the monitoring voltage is substantially equal to or less than a predetermined threshold value.
39 Citations
22 Claims
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1. An induction heating system comprising:
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a power switch;
a resonant heating circuit configured to be coupled to a load and configured to generate an oscillating voltage in response to a DC voltage pulse; and
a pulse initiator configured to provide a monitoring voltage having a value representative of an average value of a peak voltage of the oscillating voltage generated by the resonant heating circuit and to provide a pulse initiation signal to initiate application of a subsequent DC voltage pulse to the resonant heating circuit when the value of the monitoring voltage is substantially equal to or less than a predetermined threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of operating an inductive heating system, the method comprising:
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operating a power switch to apply a DC voltage pulse to a resonant heating circuit;
generating with the resonant heating circuit an oscillating voltage in response to the DC voltage pulse; and
applying a subsequent DC voltage pulse to the resonant heating circuit upon detecting that the average peak-to-peak voltage of the oscillating voltage across the resonant heating circuit is at a level substantially equal to a predetermined minimum threshold value. - View Dependent Claims (14, 15)
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16. An induction heating system connectable to an AC source, the system comprising:
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a rectifier connectable on the AC source and configured to provide a DC voltage at a DC output node;
a power switch having a first terminal, a second terminal coupled to ground, and a control gate;
a resonant heating circuit coupled between the DC output node and the first terminal of the power switch;
a pulse controller configured to provide a control signal to the power switch control gate to open and close the power switch to thereby provide a DC voltage pulse to the resonant heating circuit causing the resonant heating circuit to generate an oscillating voltage; and
a pulse initiator coupled in parallel with the resonant heating circuit and configured to monitor an average voltage across the resonant heating circuit and to provide a control signal to the pulse controller instructing the pulse controller to close the power switch to thereby initiate application of a subsequent DC voltage pulse to the resonant heating circuit when the average voltage across the resonant heating circuit falls to a level substantially equal to a predetermined threshold value. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification