Induction heating apparatus and method for controlling the same
AssigneeLG Electronics Inc.
InventorsKyelyong Kang, Ho Yong Jang
Life of this patent
Estimating the term…
Abstract
A controller may measure resonance current of a working coil, measure driving voltage of a switching element included in an inverter circuit that supplies current to the working coil, and generates a phase margin pulse based on the resonance current and the driving voltage. The controller may compare the phase margin pulse with a switching signal and determine a driving state of the induction heating apparatus, and control driving of the working coil based on the driving state of the induction heating apparatus. Additionally, when it is determined that a driving frequency of the working coil is included in a capacitive area, the induction heating apparatus stops from operating, or a driving frequency of the working coil is set again.
Claims17
An induction heating apparatus, comprising:
- a working coil disposed to correspond to a heating area;
- an inverter that includes a first switching element and a second switching element, and configured to provide current to the working coil;
- a driving circuit configured to provide a first switching signal to the first switching element and to provide a second switching signal to the second switching element;
- and
- a controller configured to determine a driving frequency of the working coil corresponding to a power level of the heating area, when the power level is input, to provide a control signal, to the driving circuit, based on the driving frequency, and to drive the working coil,
- wherein the controller is configured to:
- determine resonance current of the working coil,
- determine driving voltages of the first switching element and the second switching element that provides current to the working coil,
- provide a phase margin pulse based on the determined resonance current and the determined driving voltages,
- make a comparison of the phase margin pulse with the first switching signal and determine a driving state of the induction heating apparatus based on the comparison, and
- control the driving of the working coil based on the determined driving state of the induction heating apparatus, and
- wherein the controller is configured to determine the driving state of the induction heating apparatus based on a voltage level of the phase margin pulse, during a rising edge timing of the first switching signal.
A method for controlling an induction heating apparatus that includes an inverter and a working coil, comprising:
- receiving a power level for a heating area;
- determining a driving frequency of the working coil, corresponding to the received power level;
- driving the working coil at the determined driving frequency;
- determining resonance current of the working coil;
- determining driving voltages of a first switching element and a second switching element of the inverter that provides current to the working coil;
- providing a phase margin pulse based on the determined resonance current and the determined driving voltages;
- determining a driving state of the induction heating apparatus by making a comparison of the phase margin pulse and a first switching signal provided to the first switching element;
- and
- controlling the driving of the working coil based on the determined driving state of the induction heating apparatus,
- wherein the determining of the driving state comprises determining the driving state of the induction heating apparatus based on a voltage level of the phase margin pulse, during a rising edge timing of the first switching signal.
An induction heating apparatus, comprising:
- a working coil disposed to correspond to a heating area;
- an inverter that includes a first switching element and a second switching element, and configured to provide current to the working coil;
- and
- a controller configured to:
- determine resonance current based on the working coil,
- determine driving voltages of the first switching element and the second switching element that provides current to the working coil,
- provide a phase margin pulse based on the determined resonance current and the determined driving voltages,
- determine a driving state of the induction heating apparatus based at least on the phase margin pulse, and
- control driving of the working coil based on the determined driving state,
- wherein the controller is configured to determine the driving state of the induction heating apparatus based on a voltage level of the phase margin pulse and a rising edge timing of a first switching signal provided to the first switching element.
Dependencies are inferred from the claim text.