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There are many problems in the small home appliance industry in our country, with manufacturers having varying levels of production and research and development, and varying prices. There are also many differences in the planning of small home appliance control boards. Small home appliance control boards are the center of home appliance quality, and many control board manufacturers do not provide corresponding solutions. What are the common plans for small home appliance control boards?

1. Reduce sources of disturbance to ensure stable work

Nonlinear loads are a disturbance source with extremely wide frequency range, especially for the disturbance caused by nonlinear loads. There are two main ways to suppress it. One is to start from the nonlinear load itself. In order to reduce disturbance, it is necessary to ensure the quality of the carbon brush itself and the smoothness of the commutator. At the same time, it is necessary to protect the carbon brush from exerting appropriate pressure on the commutator. Finally, it is necessary to ensure the reliable fixation of the machine base to avoid working instability caused by mechanical operation.

2. Avoid conduction disturbance

In order to avoid conduction disturbance in the control board circuit, a capacitor C can be connected at the entrance of the circuit, as shown in a brief diagram of the capacitor anti-interference circuit connection. A safety resistor must be connected in parallel at both ends of the capacitor to prevent the power cord plug from being live for a long time when unplugged.

3. Reasonably allocate capacitor capacity

The capacity of capacitors in home appliance control boards should not be too large, and the filtering function of high-capacity capacitors for high-end disturbance signals, especially the high-frequency function of polyester film capacitors, is generally poor. Moreover, the high-frequency response characteristics of polyester film dielectric are far different from those of ceramics or mica.

Article source: Small home appliance control board IC http://433wx.cn/