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Safety protection measure of washing machine with heating function

A safety protection and washing machine technology, applied in the control device of washing machine, other washing machines, washing devices, etc., can solve the problems of relay contact adhesion, contact between contacts, frequent relay switching, etc.

Active Publication Date: 2021-06-11
江苏广中电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The relay switches too frequently, or the current flowing through the relay is too large, or there is a contact problem between the contacts, etc., resulting in the contact adhesion of the relay

Method used

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  • Safety protection measure of washing machine with heating function
  • Safety protection measure of washing machine with heating function
  • Safety protection measure of washing machine with heating function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] The present invention is specifically described below in conjunction with accompanying drawing, as image 3 As shown, a safety protection measure for a washing machine with a heating function, the specific method is:

[0029] (1) The input terminal of the optocoupler in the relay adhesion detection circuit is connected in parallel with both ends of the heater;

[0030] (2) When the heater is working, the WaterHeat is connected to the power line through the power relay, a 50Hz or 60Hz sine wave will be formed between N and WaterHeat, and a 50Hz or 60Hz square wave will be generated at DT_WaterHeat after circuit conversion.

[0031] (3) When the heater is turned off, WaterHeat is suspended, there is no voltage between N and WaterHeat, the optocoupler is not conducting, and DT_WaterHeat is always at a low level.

[0032] (4) Judging whether the heater is in the energized state by the level value of DT_WaterHeat, if the washing machine is not running in the heating process...

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Abstract

The invention discloses a safety protection measure of a washing machine with a heating function. A specific method comprises the steps that the input end of an optocoupler in a relay adhesion detection circuit is connected to the two ends of a heater in parallel; when the heater works, WaterHeat is connected to a live wire of a power supply through a power supply relay; when the heater is turned off, WaterHeat is suspended; whether the heater is in a power-on state or not is judged according to the level value of DT_WaterHeat; and after the abnormal working state is detected, a single-chip microcomputer cuts off the power supply main relay and cuts off the connection between a load and the live wire of the power supply by pulling up the Relay' level. The method has the beneficial effects that after the abnormal working state is detected, the single-chip microcomputer cuts off the power supply main relay and cuts off the connection between the load and the live wire of the power supply by pulling up the Relay' level. At this time, even if the heating relay is always in an on state, the two ends of the heater have no voltage, thereby achieving the effect of safety protection.

Description

technical field [0001] The invention relates to the field of heating functions of washing machines, in particular to a safety protection measure for washing machines with heating functions. Background technique [0002] The washing machine with heating function makes it easier to clean the stains on the clothes. The high-temperature mite removal and cooking sterilization functions are also a good selling point, but there are also certain risks. Depending on the capacity of the washing machine, the power of the heater is between 1000W and 2000W. The high-temperature mite removal and cooking sterilization functions require a temperature above 80°C, so the temperature fuse of the heater must also be selected above 80°C. If the heater is exposed to the air during heating, the temperature rises rapidly, and the machine is easily deformed by heat. Once the heater touches flammable materials, it is easy to generate an open flame and cause a fire. When designing and developing a wa...

Claims

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Application Information

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IPC IPC(8): D06F39/04D06F33/47D06F105/28
CPCD06F39/04D06F33/47D06F2105/28Y02B40/00
Inventor 罗丹
Owner 江苏广中电子科技有限公司
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