Device and method for reducing electromagnetic noise, cooking utensil

Abstract

The invention provides a device and method for reducing electromagnetic noise, and a cooking utensil, wherein the method for reducing electromagnetic noise includes: detecting the voltage in each half-wave after full-wave rectification by time intervals; If the voltage exceeds the preset chopping voltage, the voltage is modulated so that the envelope area of ​​the modulated half-wave remains unchanged, and the voltage in each period of the half-wave is less than or equal to the preset chopping voltage. Through the technical solution of the present invention, the oscillation peak voltage can be reduced through voltage modulation, thereby reducing the electromagnetic noise mainly caused by the peak voltage, so as to improve user experience.

Description

technical field [0001] 本发明涉及电磁处理领域,具体而言,涉及一种降低电磁噪音的装置、一种降低电磁噪音的方法以及一种烹饪器具。 Background technique [0002] 随着电磁技术越来越普及,如电磁炉,IH电饭煲(Induction Heater电饭煲,电感加热电饭煲)等,在这些电磁电器产品中,因电磁加热需要不停的开关IGBT(InsulatedGate Bipolar Transistor,绝缘栅双极型晶体管),同时市电,市电谐波,以及电路对市电干扰,及其市电本身的波动,都会在大功率加热下,对电器作用发出各自对应的电磁噪音,这种电磁噪音特别刺耳,主要频段为100Hz到600Hz不等,这种噪音产生的嗡嗡声、吱吱声,严重影响客户的使用体验。 [0003] 因此,如何降低电磁噪音,以改善用户的使用体验成为亟待解决的问题。 Contents of the invention [0004] 本发明旨在至少解决上述现有技术或相关技术中存在的技术问题之一。 [0005] 为此,本发明的一个目的在于提出了一种降低电磁噪音的方法。 [0006] 本发明的另一个目的在于提供了一种降低电磁噪音的装置。 [0007] 本发明的再一个目的在于提供了一种烹饪器具。 [0008] 本发明的第一方面提出了一种降低电磁噪音的方法,包括:对于全波整流后的每个半波内的电压进行分时段检测;如果任一时段内的电压超过预设斩波电压,则对上述电压进行调制,使得调制后的上述半波的包络面积不变,并且上述半波内的每一时段的电压都小于等于上述预设斩波电压。 [0009] 根据本发明的第一方面提出的降低电磁噪音的方法,对交流电的全波进行整流,如果整流后的半波电压大于预设的斩波电压,对半波电压进行分时段调制,使半波的包络面积不变,也就是保证功率不变。调制的过程还要保证半波内任一时段的电压都小于等于预设的斩波电压。这样,震荡波形电压中的峰值电压就压低在斩波电压之下,由于低电压的频谱中,低频段的增益与调制前的电压的低频段增益相比相对较低,而低频段的增益是电磁噪音的主要来源,所以压低震荡波形的峰值电压就能降低电磁噪音,以改善用户的使用体验。 [0010] 在上述技术方案中,优选地,上述对于全波整流后的每个半波内的电压进...

AI Technical Summary

Problems solved by technology

[0002] With the increasing popularity of electromagnetic technology, such as induction cooker, IH rice cooker (Induction Heater rice cooker, induction heating rice cooker), etc., in these electromagnetic electrical products, due to electromagnetic heating, it is necessary to switch IGBT (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor) continuously. type transistor), at the same time, the mains, mains harmonics, and circuit interference to the mains, as well as the fluctuation of the mains itself, will emit corresponding electromagnetic noises on the electrical appliances under high-power heating. This electromagnetic noise is particularly Harsh, the main frequency ranges from 100Hz to 600Hz, the hum and squeak generated by this noise seriously affect the customer experience

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