Household appliance and driving control method and device for electromagnet used in household appliance

Abstract

The invention discloses a household appliance and a driving control method and device for an electromagnet used in the household appliance. The method includes the following steps: outputting a high-level signal to the first control unit when receiving an instruction to start working on the electromagnet. port to keep the electromagnet in working state; after delaying the first preset time, output the PWM signal to the first control port according to the preset method to keep the electromagnet in the current working state; then output the high level signal to the first control port again The ports are cycled in sequence until the electromagnet stop working instruction is received, and a low level signal is output to the first control port to stop the electromagnet working. Therefore, by switching the output high-level signal and PWM signal to the control port, it can prevent the malfunction of the electromagnet due to the small driving power when external interference or product vibration occurs, and effectively improve the working reliability and safety of the electromagnet. .

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a method for driving and controlling an electromagnet used in a household appliance, a device for driving and controlling an electromagnet used in a household appliance, and a household appliance with the device. Background technique [0002] At present, most household appliances with pressure on the market (such as electric rice cookers, electric pressure cookers, etc.) use electromagnets as pressure control devices. Therefore, the safety and reliability of electromagnet drive is particularly important. [0003] In the related art, the driving methods of the electromagnet include: high-level drive, two-wire drive (that is, one line is driven by high-level high current, and the other line is driven by PWM (Pulse Width Modulation, pulse width modulation) small current To maintain), first use high-level drive and then switch to PWM drive. [0004] Among them, when th...

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Problems solved by technology

[0004] Among them, when the high-level drive is used, the drive port always outputs a high-level signal. This method will cause the temperature of the electromagnet to rise and consume a lot of power; After maintaining for a certain period of time, close the high current port and use the small current port to keep the electromagnet working. This method is driven by a small current, and the electromagnet has insufficient suction capacity, and is easily disconnected or other malfunctions caused by external interference. The iron work is unreliable; when the high-level drive is used first and then converted to PWM drive, the early-stage drive port outputs a high-level signal, and after a certain period of time, it is converted to a PWM signal output, and the PWM signal is always used to maintain the attraction of the electromagnet. combined, the disadvantages of this method are similar to those of the two-wire drive method

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