JPH0570498U - Electric iron - Google Patents

Abstract

(57) [Abstract] [Purpose] In an electric iron, static electricity is charged on the base and inductive noise enters the temperature control means, causing malfunction.
Prevent destruction etc. A base 2 heated by a heating element 1, a temperature detecting means 3 for detecting the temperature of the base 2, a temperature setting means 4 for setting a set temperature, and a temperature of the base 2 for keeping the set temperature. Since the temperature control means 5 including an electronic circuit for controlling is provided and the surge absorbing element 6 is connected between the base 2 and the commercial power source 7, static electricity charged in the base causes induction noise in the temperature control means. Do not invade.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric iron.

[0002]

[Prior Art]

 Conventionally, as shown in FIG. 3, this type of electric iron includes a base 2 heated by a heating element 1, a temperature detecting means 3 for detecting the temperature of the base 2, and a temperature setting means 4 for setting a set temperature. A temperature control means 5 composed of an electronic circuit for controlling the temperature of the base 2 so as to keep it at a set temperature is provided and is supplied with power from a commercial power supply 7. Nothing was connected between the base 2 and the commercial power supply 7. (See, for example, JP-A-2-111397)

[0003]

[Problems to be solved by the device]

 However, malfunction of electronic circuits due to noise has become a big problem due to the spread of microcomputers in recent years, and even in the case of electric irons, when the human body or the cloth is charged with static electricity against the ground ground, the result is It becomes the equivalent circuit 9 as shown, and by touching the base 2 during ironing, the static electricity charged on the human body or the cloth is discharged to the base 2, and the base 2 is charged with static electricity. As indicated by the broken line arrow in FIG. 3, the temperature detection means 3 or the lead wire connecting the heating element 1 and the temperature control means 5 is introduced into the temperature control means 5 or directly into the temperature control means 5 as an induction noise to detect the temperature. The control means 5 (especially the microcomputer) may malfunction or be destroyed. When malfunction or destruction occurs, the heating element 1 continues to be turned on and the base 2 is abnormally overheated, which may result in a very dangerous mode.

[0004]

[Means for Solving the Problems]

 The present invention has been made to solve the above problems, and in an electric iron equipped with a temperature detection means, a temperature setting means, and a temperature control means composed of an electronic circuit, it is provided between a base and a commercial power source. The surge absorption element was connected to.

[0005]

[Action]

 The electric iron of the present invention is connected to the ground via a commercial power source so that when the human body or cloth is charged with static electricity with respect to the ground, the base is not charged with static electricity when it touches the base. By letting it escape, induction noise does not enter the temperature control means.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of the iron body and an equivalent circuit for electrostatic discharge. The base 2 is heated by the heating element 1, the temperature detecting means 3 for detecting the temperature of the base 2 and the set temperature are set. The temperature control means 4 and the temperature control means 5 composed of an electronic circuit having a microcomputer for controlling the temperature of the base 2 to be kept at the set temperature.

A surge absorbing element 6 is connected between the base 2 and the commercial power supply 7. Then, the equivalent circuit 9 when the human body or the cloth is charged with static electricity with respect to the earth 8 is connected to the earth 8 by the capacitor C and the resistor R.

FIG. 2 shows a circuit block diagram, which is connected to the temperature control means 5 for controlling the heating element 1, the base 2 and the commercial power supply 7 and between them by the signals from the temperature detection means 3 and the temperature setting means 4. The surge absorbing element 6 and the surge absorbing element (varistor) 10 connected between the lines of the commercial power supply 7 are included.

Next, the operation of this configuration will be described.

First, when starting ironing, the set temperature is set by the temperature setting means 4 according to the type of cloth. Then, the temperature of the base 2 at that time is detected by the temperature detecting means 3, and the energization of the heating element 1 is controlled by the temperature control means 5 in order to keep the temperature of the base 2 at the set temperature. At that time, as shown in FIG. 1, the human body or the cloth is charged with static electricity against the ground 8, and when it touches the base 2, the static electricity is discharged, and the discharged static electricity is indicated by the broken line arrow in FIG. As described above, the current flows through the surge absorbing element 6 to the commercial power source 7 and then from the commercial power source 7 to the earth ground 8. (One side of the commercial power supply 7 is grounded to the ground 8). Therefore, inductive noise does not enter the temperature control means 5 from the base 2. If the ground 8 on one side of the commercial power source 7 and the line of the commercial power source 7 to which the surge absorbing element 6 is connected are not the same, the line on the other side (ground) is also passed through the surge absorbing element (varistor) 10. To the earth 8).

Although the surge absorbing element 6 is directly connected to the commercial power supply 7 in this example, it is connected to GND or VDD of the microcomputer constituting the temperature control means 5 and commercialized via a resistor or the like. The same effect can be obtained even if it is released to the power supply 7.

[0013]

[Effect of the device]

 As described above, according to the present invention, since the surge absorbing element is connected between the base and the commercial power source, even if the human body or the cloth is charged with static electricity and it touches the base, Since static electricity does not get charged and flows into the earth ground, inductive noise does not enter the temperature control means, and malfunctions or destruction of the temperature control means (especially the micro computer) are eliminated, ensuring safety and reliability. Can provide expensive electric irons.

[Brief description of drawings]

FIG. 1 is a structural diagram of an electric iron according to an embodiment of the present invention.

FIG. 2 is a circuit block diagram of an electric iron according to an embodiment of the present invention.

FIG. 3 is a structural diagram showing a conventional electric iron.

[Explanation of symbols]

 1 heating element 2 base 3 temperature detection means 4 temperature setting means 5 temperature control means 6 surge absorption element 7 commercial power supply

Claims (1)

[Scope of utility model registration request] 1. A base (2) heated by a heating element (1), temperature detecting means (3) for detecting the temperature of the base (2), and temperature setting means (4) for setting a set temperature.
And a temperature control means (5) which is an electronic circuit for controlling the temperature of the base (2) so as to keep it at a set temperature, and the surge absorbing element (6) is provided between the base (2) and the commercial power supply (7). ) Is connected to the electric iron.