Washing machine control board with variable frequency motor driving function

Abstract

The invention provides a washing machine control board with a variable frequency motor driving function, comprising a single chip microcomputer control circuit, a motor power driving circuit, a load driving circuit and a power supply circuit. The single-chip microcomputer control circuit adopts a Fujitsu's single-chip microcomputer of MB9AF111K specifications as the main control module. The motor power driving circuit is designed and produced by a special driving module. The motor power driving circuit further comprises a motor three-phase current sampling circuit. The load driving circuit is controlled by the design technology for silicon controlled rectifiers Q3 and Q4; and the single chip microcomputer directly drives the silicon controlled rectifiers through a PNP tube to work. The power supply circuit selects the module power supply technology. The invention adopts a scientific and optimized circuit design, with the structure of a control system simplified and the cost for maintenance and production reduced. Through the simultaneous control design to the motor and other loads of the machine, the real-time response improves and failures that may be caused by excessive spare parts are reduced, making operations easier and more convenient.

Description

technical field [0001] The patent of the present invention relates to the technical field of washing machine control boards, especially a washing machine control board with variable frequency motor drive function, which improves the existing problems of complex structure, high manufacturing cost and inconvenient maintenance of the existing frequency conversion washing machine control boards, and improves the efficiency of the entire device. Stability and rapidity of operational reaction time. Background technique [0002] Traditional washing machines use continuous duty and switch duty motors as power motors to drive the drum to achieve the purpose of cleaning clothes. Although this type of washing machine works stably and is classic and reliable, the defect that it does not have variable speed is getting more and more It cannot meet people's strict requirements for energy saving, environmental protection and cleaning of various types of clothes. At this time, the new produc...

AI Technical Summary

Problems solved by technology

[0005] 1. The structure is complex, the manufacturing cost is high, the maintenance cost is high, and it does not conform to the guiding ideology of the existing environmental protection policy of energy saving and consumption reduction;

[0006] 2. The communication method is used to control the motor, often due to the abnormal communication link, the motor drive is abnormal, and the operation cannot achieve the maximum stable effect;

[0007] 3. When using communication to control the motor, the communication process takes a certain amount of time, so some demanding real-time processing cannot be carried out well.

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