Electromagnetic induction heating device
A technology of electromagnetic induction heating and heating coil, applied in induction heating, induction heating control and other directions, it can solve the problem of inverter interference sound, etc., and achieve the effect of preventing interference sound, reducing the number of parts, and suppressing withstand voltage.
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Embodiment 1）
[0044] figure 1 It is a circuit configuration diagram of the electromagnetic induction heating device of Embodiment 1, and an unshown object to be heated (for example, a cooking pot) is magnetically coupled to a heating coil to supply power to the object to be heated (cooking pot). exist figure 1 Among them, between the positive electrode and the negative electrode of the DC power supply 1, a power semiconductor switching element 3a, an inductor 41, and a switching element 3b are connected in series. In addition, a resonant load circuit 60 , a smoothing capacitor 44 , and a diode 43 are connected in series at both ends of the inductor 41 . The resonant load circuit 60 is constituted by the heating coil 11 and the resonant capacitor 13 connected in parallel. Diodes 4a, 4b are connected in antiparallel to switching elements 3a, 3b, respectively.
[0045] exist figure 1 Among them, the switching elements 3a, 3b, the inductor 41, and the diode 43 constitute the chopper circuit...
Embodiment 2）
[0054] image 3 It is a circuit configuration diagram of the electromagnetic induction heating device of Example 2. For and Example 1 figure 1 , figure 2 The same parts are attached with the same symbols, and explanations are omitted.
[0055] exist image 3 in, with figure 1 The difference is that the switching element 3c is connected between the resonant capacitor 13 and the switching element 3b, the diode 4c is connected in antiparallel to the switching element 3c, and the snubber capacitor 14 is connected in parallel with the switching element 3b. In addition, the capacity of the snubber capacitor 14 is smaller than that of the resonant capacitor 13 .
[0056] Next, the operation of this embodiment will be described. Figure 4 The operation waveforms of each part of this embodiment are shown. Figure 4 (a) shows the operation waveform at low power output, Figure 4 (b) shows the operation waveform at the time of high power output. exist Figure 4 in, toward fi...
Embodiment 1
[0062] Compared with the first embodiment, the present embodiment can suppress the withstand voltage of the switching element 3b because the voltage applied to the switching element 3b is clamped. Figure 5 represents the relationship between the on-time duty ratio of the switching element 3a and the filter voltage, Figure 6 Indicates the relationship between filtered voltage and input power. filter voltage, such as Figure 5 As shown, increasing in proportion to the on-time duty cycle of switching element 3a, the input power as Figure 6 , increases proportionally to the square of the filtered voltage.
[0063] in addition, Figure 7 Indicates the relationship between the input power and the voltage applied to the switching element 3b, Figure 8 Indicates the relationship between input power and resonance capacitor voltage. The solid line represents the characteristics of this embodiment, and the dotted line represents the characteristics when the chopper circuit 10 is ...
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