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Electromagnetic induction heating device

An electromagnetic induction heating and circuit technology, which is applied in the direction of induction heating devices, induction heating, electric heating devices, etc., can solve problems such as the limitation of the driving frequency setting range, and achieve the effect of reducing the number of components

Active Publication Date: 2011-02-16
HITACHI APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, although the high-frequency inverter can be switched between a full-bridge circuit system and a half-bridge circuit system, the resonance capacitor is fixed regardless of the circuit system, so there is a limit to the setting range of the driving frequency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] figure 1 It is a circuit configuration diagram of the electromagnetic induction heating device according to the first embodiment of the present invention. exist figure 1 Among them, a first upper and lower branch 3 and a second upper and lower branch 4 are connected between the positive electrode and the negative electrode of the DC power supply 1, the first upper and lower branch 3 is connected in series with power semiconductor switching elements 5a and 5b, the second The upper and lower branches 4 are connected in series 5c and 5d. Diodes 6a to 6d are connected in parallel to the switching elements 5a to 5d in reverse directions, respectively, and snubber capacitors (snubber condensers) 7a and 7b are connected in parallel to the switching elements 5a and 5b, respectively. The snubber capacitors 7a and 7b are charged or discharged by the cut-off current when the switching element 5a or 5b is turned off, and the change in the voltage applied to the two switching elem...

Embodiment 2

[0064] Figure 4 It is a circuit configuration diagram of the electromagnetic induction heating device according to the second embodiment of the present invention. right with figure 1 The same symbols are assigned to the same parts, and descriptions thereof are omitted. exist Figure 4 Among them, one end of the heating coil 11 is connected to the output terminal of the first upper and lower branch 3 , and a third resonant capacitor 14 is connected between the other end of the heating coil and the positive electrode of the DC power supply 1 . When the object to be heated is copper or aluminum, the relay 20 is turned off, and the heating is performed by a half-bridge inverter composed of the first upper and lower branches 3, the heating coil 11, and the first and third resonant capacitors 12 and 14. heating. As mentioned above, when heating an object with low resistance, it is more effective to increase the frequency, so the capacities of the first and third resonant capaci...

Embodiment 3

[0067] Figure 5 It is a circuit configuration diagram of the electromagnetic induction heating device according to the third embodiment of the present invention. right with figure 1 The same symbols are assigned to the same parts, and descriptions thereof are omitted. exist Figure 5 in, with the figure 1The difference is that snubber capacitors 7c, 7d are connected in parallel to the switching elements 5c, 5d of the second upper and lower arms 4, respectively. As described above, the first resonant capacitor 12 acts as a snubber capacitor for the second upper and lower arms 4, and when the wiring inductance between the resonant capacitor 12 and the second upper and lower arms 4 is large, the switching elements 5c and 5d may be affected. Apply a high surge voltage. Therefore, it is desirable to provide snubber capacitors in parallel near the switching elements 5c and 5d.

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PUM

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Abstract

The invention provides an electromagnetic induction heating apparatus applying an expected electric power to various materials to be heated. In the electromagnetic induction heating apparatus, the inverter has up-down branch circuit constituted by at least two switch elements connected in series. The inverter has a first up-down branch circuit and a second up-down branch circuit, a first resonance load circuit composed of a heating loop and a first resonance capacitor at the output terminal of the first up-down branch circuit, a second resonance load circuit composed of the heating loop and the first resonance capacitor and the second resonance capacitor between the first up-down branch circuit and the second up-down branch circuit, a switch unit for separating the second resonance load circuit from the output terminal of the second up-down branch circuit. The first resonance capacitor also has the buffer capacitor function of the second up-down branch circuit.

Description

technical field [0001] The present invention relates to an inverter-type electromagnetic induction heating device for inductively heating objects to be heated of different materials by supplying desired electric power. Background technique [0002] In recent years, an inverter type (inverter) electromagnetic induction heating device that heats an object to be heated such as a pan without using fire has been widely used. The electromagnetic induction heating device flows a high-frequency current into a heating coil, generates eddy currents in a metal object to be heated near the coil, and generates heat through the resistance of the object itself. Generally, among the objects to be heated, iron, which is a magnetic substance and has a high intrinsic resistance, is easily heated, while copper and aluminum, which are non-magnetic and have low resistance, are difficult to heat. [0003] As a prior art for solving this problem, there is an electromagnetic induction heating cooke...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B6/04H05B6/12
CPCH05B6/062
Inventor 庄司浩幸宇留野纯平神长保男矶贝雅之
Owner HITACHI APPLIANCES INC
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