INDUCTION HEATING DEVICE, INDUCTION HEATING METHOD, AND PROGRAM
First Claim
1. An induction heating device comprising:
- a plurality of induction heating coils which are disposed adjacent with each other;
capacitors each of which is connected in series to each of the induction heating coils;
a plurality of inverters each of which applies a high frequency voltage converted from a DC voltage to each series circuit of the induction heating coil and the capacitor; and
a control circuit which performs pulse width control of the high frequency voltages, as well as controls the plurality of the inverters so as to align the phase of coil currents flowing through each of the plurality of the induction heating coils,wherein each of the DC voltage is common for the plurality of the inverters.
5 Assignments
0 Petitions
Accused Products
Abstract
The purpose of the present invention is to minimize switching losses of an inverter. An induction heating device includes: a plurality of induction heating coils (20) which are disposed adjacent with each other; a plurality of inverters (30), each of which has a capacitor (40) serially connected to each of the induction heating coils (20), and converts a DC voltage into a square wave voltage; and a control circuit (15) which controls so as to align the phase of coil currents flowing though the plurality of the induction heating coils (20), wherein the control circuit (15) controls the timing at which the square wave voltage transitions such that an instantaneous value of the square wave voltage is preserved in either the DC voltage or a turnover voltage, when the coil current zero crosses.
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Citations
10 Claims
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1. An induction heating device comprising:
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a plurality of induction heating coils which are disposed adjacent with each other; capacitors each of which is connected in series to each of the induction heating coils; a plurality of inverters each of which applies a high frequency voltage converted from a DC voltage to each series circuit of the induction heating coil and the capacitor; and a control circuit which performs pulse width control of the high frequency voltages, as well as controls the plurality of the inverters so as to align the phase of coil currents flowing through each of the plurality of the induction heating coils, wherein each of the DC voltage is common for the plurality of the inverters. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An induction heating method, performed by an induction heating device comprising:
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a plurality of induction heating coils which are disposed adjacent with each other; capacitors each of which is connected in series to each of the induction heating coils; a plurality of inverters each of which applies a high frequency voltage converted from a DC voltage to each series circuit of the induction heating coil and the capacitor; and a control circuit which performs pulse width control of the high frequency voltages, wherein the control unit controls the plurality of the inverters, each having the common DC voltage, so as to align the phase of coil currents flowing through each of the plurality of the induction heating coils. - View Dependent Claims (8, 9, 10)
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Specification