JP3031111B2 - Cordless iron - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless iron used for preheating by heating a heater incorporated in a base of an iron by supplying power from the stand when the iron is placed on the stand. Things.

[0002]

2. Description of the Related Art Conventionally, cordless irons of this type have been proposed as shown in FIGS. That is, when the iron unit 1 is placed on the stand unit 2, the heater unit 5 that heats the base unit 4 of the iron unit 1 includes the electrode units P1 and P provided on both the iron unit 1 and the stand unit 2.
The heater unit 5 is connected to the heater control unit 10 provided in the stand unit 2 through the heater unit 4 and is supplied with electric power from the commercial AC power supply 3 to be heated.

A temperature detecting section 6 provided in the ironing section 1 detects the temperature of the base section 4 of the ironing section 1 and sends a signal to the temperature signal converting section 17. The temperature signal conversion unit 17 converts the output signal of the temperature detection unit 6 into a pulse voltage and outputs the pulse voltage to the electrode unit P2.

[0004] When the iron part 1 is placed on the stand part 2, the electrode part P 2 of the iron part 1 and the stand part 2
The temperature signal is transmitted to the iron unit 1 by the contact of the electrode unit P3.
At this time, a large current and voltage are applied between the electrode portions P2 and P3 to break the insulating film formed between the electrode portions, and a stable signal free from contact failure of the electrode portions is transmitted. This is to enable transmission.

The temperature pulse signal input to the stand 2 via the electrodes P2 and P3 is determined by the temperature signal processor 9 as to whether the temperature is higher or lower than the set temperature. The temperature is output to the control unit 10, and the heater control unit 10 turns on and off the voltage from the commercial AC power supply 3 based on the output signal of the temperature signal processing unit 9, and outputs the electrode unit P 4 of the stand unit 2 and the electrode unit of the iron unit 1 The power supply to the heater unit 5 of the ironing unit 1 is controlled via P1 to perform temperature control.

[0006]

However, such a structure requires a temperature signal conversion unit 17 for converting a temperature signal mounted in the ironing unit 1 into a pulse signal.
This temperature signal converter 17 has a complicated electronic circuit configuration,
The shape is large and mounting difficulties occur. An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a cordless iron having a simple configuration, a small shape, and an inexpensive configuration.

Further, when it is necessary to detect the temperature of the iron part 1 at two places, or when a temperature signal and other signals, such as a water level of a water tank mounted on the iron part 1,
Alternatively, another object of the present invention is to provide a cordless iron that can easily transmit two types of signals such as a temperature setting signal when the temperature is set by the iron unit 1.

[0008]

According to another aspect of the present invention, there is provided a cordless iron including an iron portion and a stand portion having a commercial power supply for mounting the iron portion. A base unit, a heater unit for heating the base unit, a first electrode unit for supplying power to the heater unit when the iron unit is placed on a stand unit, and detecting a temperature of the base unit. comprising a temperature detecting portion, and a second electrode which transmits the output signal of the temperature detecting portion to the stand, the stand portion, the second electrode when mounting the iron portion to the stand portion A third electrode unit that contacts the unit, a power supply unit that supplies a large current, and a temperature detection unit of the iron unit from the power supply unit through the third electrode unit and the second electrode unit of the iron unit. A large current, then The stand unit via a third electrode of the second electrode portion and the stand portion from temperature detection portion of the nylon part
A switching unit that inputs a minute current temperature signal and repeats this operation alternately, and a temperature signal from this switching unit is input to determine whether the detected voltage generated by the temperature signal current is higher or lower than a predetermined temperature. A temperature signal processing unit, a fourth electrode unit that is in contact with the first electrode unit of the iron unit, and an output from the temperature signal processing unit as input, and an iron through the first and fourth electrode units. by comprising a heater control unit for controlling the electric power supplied to the heater unit parts are a first means for solving problems.

In addition, the apparatus comprises an iron section, a stand section having a commercial power supply for mounting the iron section, and the iron section includes a base section, a heater section for heating the base section, and a stand section for mounting the iron section. A first electrode unit that supplies power to the heater unit when mounted on the unit, a temperature detection unit that detects a temperature of the base unit, and a second unit that transmits an output signal of the temperature detection unit to the stand unit. The electrode section, a load resistance section that allows a large current to flow, and an output signal of the temperature detection section is sent to the second electrode section, and then a large current is sent from the second electrode section to the load resistance section, comprising a first switching unit repeating this operation alternately, the stand unit includes a third electrode portion in contact with the second electrode portion of the ironing portion when placing the iron portion to the stand portion, Power supply for supplying large current and eye Receives the temperature signal of the minute current from the emission unit, and a temperature signal processing unit detects the voltage determines whether higher or lower than the predetermined temperature caused by the temperature the signal current, the current from the power supply unit third A large current flows through the load resistance part of the iron part through the electrode part of the iron part and the second electrode part of the iron part, and then the temperature signal from the second electrode part of the iron part through the third electrode part of the stand part Is input, and is output to the temperature signal processing unit, a second switching unit that repeats this operation alternately, a fourth electrode unit that is in contact with the first electrode unit of the ironing unit, A second object of the present invention is to provide a heater control unit for controlling electric power supplied to the heater unit of the iron unit via the first electrode unit.

Further, a third means for solving the problem is that the switching cycle of the temperature signal and the large current is set every half cycle of the commercial AC power supply.

[0011] The iron unit includes a stand unit having a commercial power supply on which the iron unit is placed. The iron unit includes a base unit, a heater unit for heating the base unit, and an iron unit. A first electrode unit for supplying power to the heater unit when the heater unit is mounted on the heater unit, a temperature detecting unit for detecting a temperature of the base unit, and a second unit for transmitting an output signal of the temperature detecting unit to the stand unit. An electrode section, a second detection section for flowing a large current, and an output signal of the temperature detection section is sent to the second electrode section. And a first switching unit that alternately repeats this operation, wherein the stand unit is a third electrode unit that contacts the second electrode unit of the iron unit when the iron unit is placed on the stand unit. And a power supply for supplying a large current, It receives the temperature signal of the minute current from parts, and determining the temperature signal processing unit detecting voltage of the higher or lower for a given temperature caused by the temperature signal current, signal from the second detecting portion of the ironing portion A second signal processing unit for processing, and a large current flows from the power supply unit to the second detection unit of the iron unit via the third electrode unit and the second electrode unit of the iron unit, Next, a temperature signal is input from the second electrode section of the iron section through the third electrode section of the stand section, and output to the second signal processing section, and then output to the temperature signal processing section. A second switching unit that repeats this operation alternately, a fourth electrode unit in contact with the first electrode unit of the iron unit, and a heater unit of the iron unit via the fourth and first electrode units. a fourth object is equipped with a heater control unit for controlling the power supplied It is set to determine means.

A fifth solution to the problem is that the switching cycle of the temperature signal and the second detection signal is set every half cycle of the commercial AC power supply.

[0013]

In the cordless iron according to the present invention, the switching means provided on the stand allows the temperature detecting part of the iron part to be connected to the third electrode part of the stand part and the second electrode part of the iron part. A large current flows through the electrode section, and then a temperature signal current flows from the temperature detection section of the iron section to the second electrode section of the iron section and the switching section of the stand section via the third electrode section of the stand section. Input and repeat this operation alternately.

By this operation, the insulating film generated between the electrode portions is broken by a large current, and then a small current of a temperature signal is received, and a large current is supplied to break the insulating film. Repeat the operation of accepting. This makes it possible to input a highly reliable temperature signal with a simple circuit configuration.

According to the second means for solving the problems, a large current from the stand portion is supplied to the third electrode portion of the stand portion and the second electrode of the iron portion by the switching portions provided in both the iron portion and the stand portion. Through the load resistance section provided in the iron section, and the minute temperature signal current from the iron section passes through the second electrode section of the iron section, the third electrode section of the stand section, and the switching section of the stand section. To the temperature signal processing unit. With this configuration, since a large current does not flow through the temperature detecting unit, highly accurate temperature detection without self-heating of the temperature detecting unit can be performed.

Further, by switching the large current and the temperature signal current every half cycle of the commercial AC power supply according to the third means for solving the problem, a simpler circuit configuration can be obtained and a smaller mounting area can be obtained. The temperature signal transmission with high accuracy and high reliability can be performed.

Further, according to the fourth means for solving the problem, a large current for switching to a minute temperature signal current is used for another signal transmission, and two types of signal transmission can be realized by a simple circuit.

Further, by switching the minute temperature signal and another large current signal every half cycle of the commercial AC power supply by the fifth means for solving the problems, it is possible to make the circuit more compact with a simpler circuit configuration. It is.

[0019]

An embodiment of the present invention will be described below with reference to the accompanying drawings. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof is omitted. In FIG. 1, an iron unit 1 includes a heater unit 5 for heating a base unit 4, a first electrode unit P <b> 1 for supplying power to the heater unit 5, and a base unit 4.
And a second electrode portion P2 for transmitting a temperature signal detected by the temperature detecting portion 6 to the stand portion 2.

The stand section 2 is provided with a third electrode section P3 which comes into contact with the second electrode section P2 of the iron section 1 when the iron section 1 is placed on the stand section 2. Stand part 2 via P3 and the second electrode part P2
Is input to the switching unit 8.

The switching unit 8 also receives an input from the power supply unit 7 and irons a large current output from the power supply unit 7 at a predetermined cycle through the third electrode unit P3 and the second electrode unit P2. The temperature signal is input to the temperature detection unit 6 of the unit 1 and a temperature signal from the iron unit 1 is also received.

By doing so, the insulating film generated between the second electrode portion P2 and the third electrode portion P3 is broken by a large current, and then a weak temperature signal current is received. The operation of accepting a signal is repeated at a predetermined cycle.

The temperature signal output from the switching unit 8 is input to a temperature signal processing unit 9 to determine whether the base temperature of the iron unit 1 is higher or lower than a set temperature, and the result of the determination is determined by the heater control. Output to the unit 10.

The heater control unit 10 turns on and off the commercial AC power supply according to the output signal of the temperature signal processing unit 9, and controls the heater of the iron unit 1 through the fourth electrode unit P 4 and the first electrode unit P 1 of the iron unit 1. The temperature control is performed by controlling the power supplied to the unit 5, whereby a highly reliable temperature signal can be transmitted with a simple circuit configuration.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. In FIG.
The first switching unit 12 and the load resistance unit 11 are provided. Further, the second switching unit 13 is provided in the stand unit 2.
Is provided.

By doing so, when the iron unit 1 is placed on the stand unit 2, the large current supplied from the power supply unit 7 of the stand unit 2 causes the second switching unit 13 and the third The current flows to the load resistance section 11 via the electrode section P3, the second electrode section P2 of the iron section 1, and the first switching section 12.

Next, the temperature signal of the base portion 4 detected by the temperature detecting portion 6 of the ironing portion 1 includes the first switching portion 12, the second electrode portion P2, the third electrode portion P3 of the stand portion 2, The signal is sent to the temperature signal processing unit 9 via the second switching unit 13.

That is, in the second embodiment, a large current is not supplied to the temperature detecting section 6 of the ironing section 1 and the load resistance section 1
1 to eliminate the self-heating of the temperature detection unit 6 and perform highly accurate temperature control.

FIG. 3 shows a waveform of a current flowing between the electrodes P2 and P3 when the iron 1 is placed on the stand 2. The current I1 is generated between the second electrode portion P2 and the third electrode portion P3.
A large current (large voltage) for breaking the insulating film generated therebetween, the current I2 is a temperature signal current. From time t0 to t1, a temperature signal is transmitted, and from time t1 to t2, the insulating film is broken.
This operation is repeated after t2.

FIG. 4 shows an embodiment of a circuit for switching between a large current and a temperature signal current every half cycle of the commercial AC power supply. In FIG. 4, when the iron unit 1 is placed on the stand unit 2, the diode D <b> 4 is set to flow in the direction of the current I <b> 2 to the thermosensitive element Rth constituting the temperature detection unit 6 of the iron unit 1.
Connect.

The current I2 is converted from VAC constituting the commercial AC power supply 3 of the stand 2 to the resistor R1, the diode D1, the third electrode P3, and the electrode P2 of the ironing section 1, the diode D4, the thermal element Rth, It flows with the electrode part P5, the electrode part P6 of the stand part 2, and the commercial AC power supply VAC.

The magnitude I2 of the current varies depending on the base temperature of the heating element 5 at which the resistance value of the thermosensitive element Rth changes. Therefore, the voltage V (the terminal voltage of the resistor R1) generated by the variation of the magnitude I2 of the current. ), The temperature can be detected.

The load resistance unit 1 provided on the iron unit 1
1 is connected to the diode D so that a current I1 in a direction opposite to the current I2 flowing through the thermal element Rth flows through the resistor R2.
3 so that the current I1 flows through the second electrode portion P2.

The stand 2 receives the current I1 flowing through the resistor R2 of the iron 1 via the second electrode P2.
And flows through the third electrode portion P3 through the diode D2 to the commercial AC power supply VAC.

That is, the current I1 is supplied from the commercial AC power supply VAC of the stand 2 to the electrode P6 and the electrode P of the iron 1.
5, the current flows to the commercial AC power supply VAC via the resistor R2, the diode D3, the second electrode portion P2, the third electrode portion P3 of the stand portion 2, and the diode D2.

FIG. 5 shows the second electrode portion P2 and the third electrode portion P
3 shows three waveforms of flowing current. I1 is a large current that destroys the insulating film generated between the second electrode portion P2 and the third electrode portion P3;
I2 is a temperature signal current. As described above, the temperature signal current and the large current are switched every half cycle of the commercial AC power supply VAC.

FIG. 6 shows a waveform of the detection voltage V generated by the temperature signal current I2. Since the detection voltage V increases as the temperature rises, the temperature can be known by detecting the voltage V.

In FIG. 4, diodes D3 and D4 of the iron unit 1 constitute a first switching unit 12, diodes D1 and D2 of the stand unit 2 constitute a second switching unit 8, and a commercial AC power supply VAC is a power supply unit. 7, the IC 9 constitutes the temperature signal processing unit 9, and the relay contact part RL and the relay coil part (not shown) and part of the IC 9 constitute the heater control unit 10.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The ironing unit 1 is provided with a detecting unit 14 that operates by passing a large current instead of the load resistor 11 of the second embodiment. The detection unit 14 is a heat-sensitive element having no problem even when a large current flows, a water level detection unit of a water tank mounted on the iron unit 1, a temperature setting level detection unit, or the like.

The stand unit 2 includes a temperature signal processing unit 9 which receives an output of the second switching unit 13 of the stand unit 2 of the second embodiment as an input, and a second signal processing unit 15. It comprises a control unit 16 controlled by the output of the signal processing unit 15.

The large current output from the power supply section 7 of the stand section 2 is supplied to the second switching section 13, the third electrode section P3, the second electrode section P2 of the iron section 1, the first switching section 12, and the second switching section 12. Is sent to the detection unit 14.

The magnitude of the large current changes according to the detecting operation of the second detecting section 14. The change is detected by the second switching unit 13 and the second signal processing unit 15 of the stand unit, the detection signal of the second detection unit 14 is detected, and the result is output to control the control unit 16.

Next, the minute current output from the second switching section 13 of the stand section 2 flows to the temperature detecting section 6 via the first switching section 12 of the iron section 1, and detects the temperature signal as described above. The detection operation of the second detection unit 14 by the large current and the temperature detection operation of the temperature detection unit 6 by the small current are repeated at a predetermined cycle.

FIG. 8 shows a fifth embodiment of the circuit in which this is repeated every half cycle of the commercial AC power supply. In the embodiment of FIG.
An example in which a variable resistor VR for detecting a temperature setting level is used as a second detection unit will be described. Among the half cycles of the commercial AC power supply, I1 sends the information of the temperature setting level from the ironing unit 1 to the stand unit 2, and I2 of the other half cycle uses the thermal element Rth.
To detect the temperature of the base portion 4 of the ironing portion 1.
That is, the terminal voltage V of the resistor R1 provided in the stand 2
1, the temperature signal is detected by the terminal voltage V2 of the resistor R3.

FIG. 9 shows the second electrode portion P2 and the third electrode portion P
3 shows a waveform of a current flowing between three points. The temperature is detected by the magnitude of the current I2, and the temperature setting level is detected by the magnitude of the current I1. As described above, when the iron part 1 is placed on the stand part 2 and the electrodes of the iron part 1 and the stand part 2 come into contact with each other to transmit the temperature signal, the temperature signal current and the large current are alternately applied to the electrode part. The flow allows temperature signal transmission with high reliability with a simple circuit configuration.

Further, by sending a large current to the other detection section, two kinds of signals, a temperature signal and another signal, can be transmitted with a simple circuit configuration. Further, in the present embodiment, the temperature signal and the other signal have been described. However, it is obvious that the present invention is not limited to the type of the signal, and that any other signal is applicable. Naturally extends to that range.

[0047]

As described above, the cordless iron of the present invention has an iron part and a commercial power supply on which the iron part is placed.
The ironing section comprises a stand having a source.
Base section, a heater section for heating the base section,
When the iron part is placed on the stand part, it
A first electrode section for supplying power, and a temperature of the base section.
A temperature detector to be detected and an output signal of the temperature detector are scanned.
A second electrode for transmitting to the stand.
When the iron part is placed on the stand part,
A third electrode portion that contacts the second electrode portion;
And a power supply section for supplying the third electrode section and the iron section.
The power supply unit through the second electrode unit
Apply a large current to the temperature detector, and then
Via the second electrode and the third electrode of the stand
Input a minute current temperature signal to the stand
The switching part that repeats the work alternately, and this switching
Input the temperature signal from the
The detected voltage is higher or lower than a predetermined temperature
A temperature signal processing unit, which is in contact with the first electrode unit of the ironing unit;
The touched fourth electrode unit and the output of the temperature signal processing unit are input.
Force and iron through the first and fourth electrode parts
And a heater control unit for controlling the power supplied to the heater unit.
With this configuration, highly reliable temperature signal transmission can be realized with a simple circuit configuration . In addition, iron part
Stand with commercial power supply to place iron part
The iron part comprises a base part and the base part
Heater and the iron part to a stand part
A first power supply for supplying power to the heater section when the heater section is mounted;
A pole portion, a temperature detection portion for detecting the temperature of the base portion,
The second output signal from the temperature detector is transmitted to the stand.
Electrode part, a load resistance part through which a large current flows, and the temperature detection
Unit output signal to the second electrode unit, and then the second electrode unit
A large current is sent from the electrode to the load resistor, and this operation is
A first switching unit that is alternately repeated.
The stand is before the iron is placed on the stand.
A third electrode portion that contacts the second electrode portion of the ironing portion
And a power supply to supply a large current
It receives the temperature signal of the current, caused by the temperature signal current
Temperature for determining whether the detected voltage is higher or lower than a predetermined temperature
And a current from the power supply unit to the third power supply.
Of the iron part through the second electrode part of the pole part and the iron part
Apply a large current to the load resistor, and then
A temperature signal is input from the pole through the third electrode of the stand.
Output to the temperature signal processing unit, and
A second switching unit that repeats alternately, and the ironing unit
A fourth electrode portion in contact with the first electrode portion of
Supply to the heater part of the iron part through the first electrode part
Since a heater control unit for controlling electric power is provided,
There is no self-heating of the sensor, and accurate temperature detection is performed.
Can be. The switching period between the temperature signal and the large current is
Small installation because it is set every half cycle of AC power supply
Temperature signal transmission with high area and high reliability can be performed.
Also, an iron part and a commercial power
The ironing section comprises a stand having a source.
Base, a heater for heating the base, and an air heater.
When the heater is placed on the stand,
Detects the temperature of the first electrode part that supplies air and the base part
A temperature detector to be activated and an output signal of the temperature detector.
And a second electrode for transmitting a large current.
A sensing unit and an output signal of the temperature detecting unit to the second electrode unit.
Then, a larger current is supplied from the second electrode section to the second detection section.
The first switch that sends the signal to the
A stand portion, and the stand portion has a
When placed on the ironing section, it comes into contact with the second electrode section of the ironing section.
A third electrode part to be touched, a power supply part for supplying a large current,
Input the temperature signal of minute current from the iron part, and
Is the detection voltage generated by the current higher than the specified temperature?
The temperature signal processing unit that determines whether the temperature is low
A second signal processing unit for processing a signal from the detection unit of
The current from the power supply section is supplied to the third electrode section and the iron section.
A large electric current is supplied to the second detection section of the iron section via the second electrode section.
Flow, then stand from the second electrode part of the iron part
Input a temperature signal through the third electrode part of the part, and
And then output to the temperature signal processing section.
And a second switching section that repeats this operation alternately
And a fourth electrode in contact with the first electrode portion of the iron portion
Section and the iron section through the fourth and first electrode sections
And a heater control unit for controlling power supplied to the heater unit.
To perform two types of signal transmission with a simple circuit
Can be. Switching between the temperature signal and the second detection signal
Since the cycle is set for each half cycle of the commercial AC power supply,
The size can be further reduced with a simple circuit configuration.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a cordless iron of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the cordless iron.

FIG. 3 is a waveform diagram of a current flowing between electrodes P2 and P3 of the cordless iron.

FIG. 4 is a circuit diagram showing a third embodiment of the cordless iron.

FIG. 5 is a waveform diagram of a current flowing between electrodes P2 and P3 in a third embodiment of the cordless iron.

FIG. 6 is a waveform chart showing a temperature detection voltage V in a third embodiment of the cordless iron.

FIG. 7 is a block diagram showing a fourth embodiment of the cordless iron.

FIG. 8 is a circuit diagram showing a fifth embodiment of the cordless iron.

FIG. 9 is a waveform diagram of a current flowing between electrodes P2 and P3 in a fifth embodiment of the cordless iron.

FIG. 10 is a perspective view showing a state in which a conventional iron unit is detached from a stand unit.

FIG. 11 is a block diagram of a conventional cordless iron.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron part 2 Stand part 4 Base part 5 Heater part 6 Temperature detection part 7 Power supply part 8 Switching part 9 Temperature signal processing part P4 Fourth electrode part 10 Heater control part P1 First electrode part P2 Second electrode part P3 Third electrode part

Claims (5)

(57) [Claims] 1. An ironing device comprising: an ironing unit; and a stand unit having a commercial power supply on which the ironing unit is mounted. The ironing unit includes a base unit, a heater unit for heating the base unit, and a stand unit for the ironing unit. A first electrode unit that supplies power to the heater unit when mounted on the unit, a temperature detection unit that detects a temperature of the base unit, and a second unit that transmits an output signal of the temperature detection unit to the stand unit. ; and a electrode portion, the stand unit includes a third electrode portion in contact with the second electrode portion when mounting the iron portion to the stand unit, and a power supply unit for supplying a large current, A large current flows from the power supply section to the temperature detecting section of the iron section through the third electrode section and the second electrode section of the iron section, and then the second electrode section from the temperature detecting section of the iron section. And the stand through the third electrode of the stand De unit receives the temperature signal of low current to a switching unit repeating this operation alternately, enter the temperature signal from the switching unit, the temperature signal current
A temperature signal processing unit for determining whether the detected voltage generated by the iron unit is higher or lower than a predetermined temperature, a fourth electrode unit in contact with a first electrode unit of the iron unit, and an output of the temperature signal processing unit. was an input, said cordless iron provided with the heater control unit that the first and through fourth electrode portion for controlling the electric power supplied to the heater portion of the ironing portion. 2. An iron unit, comprising a stand unit having a commercial power supply for mounting the iron unit, wherein the iron unit includes a base unit, a heater unit for heating the base unit, and a stand unit for the iron unit. A first electrode unit that supplies power to the heater unit when mounted on the unit, a temperature detection unit that detects a temperature of the base unit, and a second unit that transmits an output signal of the temperature detection unit to the stand unit. The electrode section, a load resistance section that allows a large current to flow, and an output signal of the temperature detection section is sent to the second electrode section, and then a large current is sent from the second electrode section to the load resistance section, comprising a first switching unit repeating this operation alternately, the stand unit includes a third electrode portion in contact with the second electrode portion of the ironing portion when placing the iron portion to the stand portion, Power supply for supplying large current and iron Minute receives the temperature signal of the current, and the temperature signal processing unit detects the voltage determines whether higher or lower than the predetermined temperature caused by the temperature the signal current, the current from the power supply unit third electrode from A large current flows through the load resistance section of the iron section through the second electrode section of the iron section and the iron section, and then a temperature signal is input from the second electrode section of the iron section through the third electrode section of the stand section And a second switching unit that outputs to the temperature signal processing unit and alternately repeats this operation, a fourth electrode unit in contact with the first electrode unit of the ironing unit, cordless iron provided with the heater control unit for controlling the electric power supplied to the heater portion of the ironing portion via the electrode portion. 3. The cordless iron according to claim 1, wherein a switching cycle between the temperature signal and the large current is set every half cycle of the commercial AC power supply. 4. An ironing unit, comprising a stand unit having a commercial power supply on which the iron unit is placed, wherein the iron unit includes a base unit, a heater unit for heating the base unit, and an iron unit for a stand unit. A first electrode unit for supplying power to the heater unit when the heater unit is mounted on the heater unit, a temperature detecting unit for detecting a temperature of the base unit, and a second unit for transmitting an output signal of the temperature detecting unit to the stand unit. An electrode section, a second detection section for flowing a large current, and an output signal of the temperature detection section is sent to the second electrode section. And a first switching unit that alternately repeats this operation, wherein the stand unit is a third electrode unit that contacts the second electrode unit of the iron unit when the iron unit is placed on the stand unit. And a power supply that supplies a large current and an iron The temperature signal of the minute current is input, and a temperature signal processing unit that determines whether the detection voltage generated by the temperature signal current is higher or lower than a predetermined temperature, and a signal from the second detection unit of the iron unit. A second signal processing unit to be processed, and a large current is passed from the power supply unit to the second detection unit of the iron unit via the third electrode unit and the second electrode unit of the iron unit. In, a temperature signal is input from the second electrode part of the iron part via the third electrode part of the stand part, and is output to the second signal processing part, and then output to the temperature signal processing part, A second switching unit that repeats this operation alternately, a fourth electrode unit in contact with the first electrode unit of the iron unit, and a heater unit of the iron unit via the fourth and first electrode units. cordless iron provided with the heater control unit for controlling the power supply. 5. The cordless iron according to claim 4, wherein a switching cycle of the temperature signal and the second detection signal is set every half cycle of the commercial AC power supply.