Thermal protection control circuit of electric iron

Abstract

The invention discloses a thermal protection control circuit of a dry electric iron, comprising an internal temperature control switch and a bottom plate heating resistor which are serially connected into a bottom plate heating circuit; an external power supplies power to the bottom plate heating circuit; the thermal protection control circuit also comprises a protection circuit which is parallelly connected with the bottom plate heating circuit; the protection circuit comprises a manual switch and a protection resistor which are serially connected; the manual switch is a normally closed switch; the bottom plate heating circuit is serially connected with an external temperature control switch for detecting the temperature of the protection resistor; and the external temperature control switch is a contact switch which is immediately disconnected once the heating temperature of the protection circuit exceeds the temperature control threshold thereof. Because the bottom plate heating circuit is parallelly connected with the protection circuit, when a user lays the electric iron on clothing and walks away for some time, the bottom plate heating circuit is immediately disconnected, thereby preventing the electric iron from keeping heating when being laid after the user leaves, preventing the clothing from being singed and voiding fire accidents; and the circuit has simple structure, and is safety and reliable.

Description

technical field [0001] The invention relates to a control circuit of an electric iron, in particular to a thermal protection control circuit of a dry electric iron. Background technique [0002] Along with people's living standard improves day by day, people also attaches great importance to wearing, especially to the cleanliness of clothes, the requirement of straightness is quite high, thereby makes electric iron become one of important household appliances daily necessities. However, most electric irons are not safe during use, such as high temperature, easy to iron clothes, and even cause fires caused by other flammable objects. Although the existing electric iron has an automatic power-off protection function when it reaches the rated temperature, it only cuts off the power immediately when it is placed vertically, but there is no power-off and abort heating function when it is placed statically, so when the electric iron is placed flat on the clothes When the user wal...

AI Technical Summary

Problems solved by technology

However, most electric irons are not safe during use, such as high temperature, easy to iron clothes, and even cause other flammable objects to cause fire, etc.

Although the existing electric iron has an automatic power-off protection function when it reaches the rated temperature, it only cuts off the power immediately when it is placed vertically, but there is no power-off

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