Automatic power-off protection device for high household appliance resistance

Abstract

The invention discloses an automatic power-off protection device for high household appliance resistance. The automatic power-off protection device is mainly composed of a resistor R1 connected in parallel with a household appliance product line or a household appliance connection line required to be monitored and a control circuit automatic power-off device, wherein the resistance of the resistor R1 is much higher than the total resistance R2 of an original circuit. According to the control circuit automatic power-off device, a current transformer is connected with a control switch. When current reaches a certain value, a coil in the current transformer generates current which enters the control circuit automatic power-off device, and a device control circuit causes a drive mechanism to operate to disconnect a line and thus achieve a protective effect. The automatic power-off protection device can automatically power off a household appliance circuit with over-high resistance so as to protect the household appliances.

Description

technical field [0001] The invention relates to the technical field of home appliances, in particular to the protection technology of home appliances, in particular to the technical field of excessive resistance protection in an automatic warning circuit. Background technique [0002] Problems and shortcoming existing in the prior art: [0003] For a long time, during the use of home appliances such as electric water heaters, the contact points are alternately exposed to cold and heat for a long time. After a long time of use, the contact points of the terminals are not in good contact, resulting in a reduction in the contact area of ​​the line terminals and an increase in the contact resistance, resulting in local overheating and causing contact points to be damaged. Spark, arc or worse fire accident. [0004] The main cause of the accident is the reduction of the contact area of ​​the terminal and the increase of the contact resistance. [0005] After long-term high-powe...

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Problems solved by technology

If the "jacket" of the wire is damaged, it will also cause a short circuit, causing the two wires to collide, which will cause discharge and produce electric sparks, arcs, etc.

If these electric sparks and arcs fall on combustible and combustible materials, it may cause the electric water heater to ignite spontaneously and cause a fire.

[0014] The application situation of the prior art is: (1) Leakage protection plug; this type of plug can only protect the product from leakage, and can only act and cut off the power when the plug is heated, and cannot protect the electric spark, arc or even Phenomenon of fire

[0015] (2) Leakage protection switch; this type of switch can only protect the leakage of household appliances, and cannot protect the phenomenon of electric sparks, arcs or even fires caused by excessive resistance of household appliances due to poor contact

But for the detection of household appliances, no one thought of using this method

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