Electromagnetic heating apparatus and electromagnetic oven equipped with same

Abstract

The invention discloses an electromagnetic heating apparatus and an electromagnetic oven. The electromagnetic heating apparatus comprises a power supply module, a resonance module, a capacitance adjustment module, and a switch module, wherein the resonance module is connected with the power supply module; the resonance module is provided with a resonance sub module which consists of a resonance inductor and a resonance capacitor; the capacitance adjustment module is used for adjusting the capacitance value of the resonance capacitor in the resonance module; and the switch module is connected with the resonance module. By virtue of the additionally-provided capacitance adjustment module, the electromagnetic heating apparatus can realize continuous heating when the output power is kept within a certain frequency range (such as 200-2,000W); compared with the prior art, the low-power continuous heating purpose of the electromagnetic heating apparatus is fulfilled; the food cooking effect is remarkably improved; and the degree of satisfaction of users is improved.

Description

technical field [0001] The invention relates to the technical field of electromagnetic heating, in particular to an electromagnetic heating device and an electromagnetic oven with the electromagnetic heating device. Background technique [0002] With the rapid development of the electromagnetic heating field, the induction cooker has become the mainstream kitchen utensils in people's kitchens. At present, the induction cooker mainly cooks food through electromagnetic induction. Due to the large output power, it can generally reach 2000 watts. In order to reduce the loss of the switch tube in the induction cooker, the switch tube must work in a soft switching state. An LC resonance (where L is inductance and C is capacitance) heating scheme is employed. However, because the resonant circuit has frequency selection characteristics, only when the operating frequency of the switching tube is consistent with the LC resonant frequency, its output power is the largest and the work...

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Problems solved by technology

However, because the resonant circuit has frequency selection characteristics, only when the operating frequency of the switching tube is consistent with the LC resonant frequency, its output power is the largest and the working state is the best; when the operating frequency of the switching tube deviates from the LC resonant frequency, the resonant circuit output The smaller the power, the worse the working condition

[0003] For example, in the existing single-tube LC resonance electromagnetic heating scheme, since the inductance L of the coil disk (ie, resonance induction) and the capacity C of the resonance capacitor are a set of fixed values, the switch tube works at a certain power (such as 2000 watts) in the frequency range (about 20KHz) to reach the best state, and the higher the switching frequency of the switching tube, the lower the power and the worse the working condition. The specific performance is that the switching tube gradually exits the soft switching state and enters the hard switching state. The higher the temperature rise of the tube, so the current single-tube LC resonant electromagnetic heating can only work continuously in the range of 1000 watts to 2000 watts. When it is lower than 1000 watts, intermittent heating can be used to achieve low-power heating, such as 500 watts. Heating at 1000 watts for 5 seconds, and then stopping heating for 5 seconds as a cycle, but this intermittent heating method has poor cooking effect and cannot meet user needs

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