There are many problems in my country's small home appliance industry. Manufacturers have different production and R&D levels and price differences. There are also many differences in the control panel scheme of small home appliances. The control panel of small household appliances is the core of the quality of household appliances. Many control panel manufacturers do not provide corresponding solutions. What are the common control panel solutions for small household appliances?

1. Reduce interference sources and ensure stable operation

Non-linear load is an extremely wide frequency interference source, especially the interference of non-linear load. There are two main suppression methods. One is to start with the non-linear load itself. In order to reduce the interference, the quality of the carbon brush itself and the commutator should be guaranteed. At the same time, it is necessary to protect the carbon brush to have proper pressure on the commutator, and then to make the fixing of the machine base reliable to avoid unstable operation caused by mechanical operation.

2. Prevent conducted interference

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

3. Reasonable matching of capacitor capacity

The capacitance of the home appliance control board capacitor should not be too large, and the filtering performance of the high-end interference signal and the large-capacity capacitor is extremely poor, especially the high frequency performance of the polyester film capacitor is generally poor, and the polyester film medium The high frequency response characteristics are far from ceramic or mica.