Electromagnetic heating apparatus and electromagnetic oven

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 switch module and a current suppression 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 resonance capacitor is connected with the resonance inductor in parallel; the switch module is connected with the first end of the resonance inductor in the resonance module; the current suppression module is used for suppressing impact current on the switch module from the resonance capacitor in the resonance module; the current suppression module comprises a suppression inductor; and the first end of the suppression inductor is connected with the power supply module while the second end of the suppression inductor is connected with the second end of the resonance capacitor. By adoption of the electromagnetic heating apparatus provided by the embodiment, the food cooking effect under low power can be improved so as to well satisfy requirements of users.

Description

technical field [0001] The invention relates to the technical field of household electrical appliances, in particular to an electromagnetic heating device and an electromagnetic cooker. Background technique [0002] Using electromagnetic induction to cook food, because the output power is very large, it can usually reach 2000 watts. In order to reduce the loss of the switch tube (such as the insulated gate bipolar transistor IGBT), let the switch tube work in a soft switching state. In related technologies, usually The LC resonance heating scheme is adopted. 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; worse. In the single-tube LC resonant electromagnetic heating scheme, since the inductance L of the coil disk and the capacity C of the capacitor are a set of fixed values, the switch...

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Problems solved by technology

In the single-tube LC resonant electromagnetic heating scheme, since the inductance L of the coil disk and the capacity C of the capacitor are a set of fixed values, the switch tube works in the 2000-watt frequency range (about 20KHz) to reach the best state. The higher the switching frequency of the switching tube, the lower the power, and the worse the working state. The specific performance is that the switching tube will gradually exit the soft switching state and enter the hard switching state, and the temperature rise of the switching tube will be higher. Therefore, the current single-tube LC resonant electromagnetic The heating method usually can only work continuously in the range of 1000 watts to 2000 watts. When it is lower than 1000 watts, low-power heating can be realized by intermittent heating. , heating again and again, but this intermittent heating method has poor cooking effect, affects the cooking effect, and cannot meet the needs of users

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