Washing machine and interference suppression module thereof

Abstract

The invention relates to a washing machine and an interference suppression module thereof. The interference suppression module comprises an input protection circuit, an interference suppression circuit and a leakage current protection circuit connected in parallel to a mains grid. An outgoing ground wire of the leakage current protection circuit is connected with a ground wire of the mains grid through a connecting wire. The output of the leakage current protection circuit is in circuit connection with a control system of the washing machine. The interference suppression circuit comprises at least two stages of common mode inductor coils L connected in series and at least one capacitor Cx. The interference suppression module has the advantages that stability of interference suppression is enhanced through the common mode inductor coils L, surge resistance and thunder resistance are improved, no electric shock occurs during running even when no ground wire connection is provided at home, safety of the washing machine is greatly improved, and the ability of the washing machine to adapt to different electricity consumption environments is enhanced.

Description

technical field [0001] The invention belongs to the technical field of washing machines, and in particular relates to a suppressing module for filtering out electromagnetic interference of a washing machine to a mains power grid and a washing machine using the suppressing module. Background technique [0002] Inside the electrical system of the washing machine, a large number of electromagnetic interference (EMI) signals will be generated around the switching power supply circuit, freewheeling diode, high-frequency transformer, DC motor frequency conversion circuit, etc. These electromagnetic interference (EMI) signals will increase with the frequency conversion To become more serious, there are generally two ways for electromagnetic interference (EMI) signals to propagate outward and interfere with the mains power grid, that is, through conduction and radiation. [0003] At present, interference suppression circuits have been widely used in washing machines, and anti-EMI in...

AI Technical Summary

Problems solved by technology

Conventional interference suppression circuits are generally composed of discrete components such as common-mode inductors, differential-mode inductors, and capacitors, and the distributed inductance and distributed capacitance caused by the long lead wires of discrete components and the irregular distribution of the electrical circuit of the washing machine have a great impact on its anti-interference characteristics. Therefore, the conventional interference suppression circuit has a strong dependence on the washing machine circuit design and production operation process, which is not conducive to modern and large-scale assembly line production

[0005] 2. Weak ability to resist lightning and surge impact

Electromagnetic interference (EMI) signals on the mains power grid and a large number of surge pulses and lightning shock pulses also have a serious impact on the electrical system of the washing machine, making it work abnormally and even cause safety hazards such as explosion of electrical components

Moreover, conventional interference suppression circuits generally can only withstand a surge test voltage of 1000V, and at the same time, the number of times against surges is limited, so the interference suppression effect of conventional interference suppression circuits will be greatly reduced, making the electromagnetic interference (EMI) signal string on the washing machine Into the mains grid, affecting the use of other electrical devices

[0006] 3. Poor security

However, considering the particularity of the electricity consumption environment of a single user, especially the majority of rural users, many users do not have a ground wire at home, or the grounding is not good, and the leakage current generated by the conventional interference suppression circuit is derived without a ground wire, which will make the user There is a strong electric shock feeling during use, which is especially harmful to users with heart disease

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