JP2591179B2 - Cordless iron - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention provides an electric power supply from a stand to a heater incorporated in an iron main body when the iron main body is set on a stand without a power cord in the iron main body. The present invention relates to a cordless iron that is heated by heating.

2. Description of the Related Art Conventionally, as a cordless iron of this type, a method of transmitting a signal from a heat-sensitive element incorporated in an iron main body to a temperature controller of a stand has been proposed. However, in such a configuration, since the current flowing through the thermosensitive element is weak and the voltage is also small, conduction between the electrodes transmitting the temperature signal becomes poor, and normal temperature control cannot be performed. Was something. On the other hand, as an improvement plan of this method,
A method of converting a temperature signal of the iron body into a pulse signal and transmitting the pulse signal to a stand has also been proposed. This method will be described with reference to FIGS. 6 and 7. In the figure, reference numeral 32 denotes an iron main body, and a heater 34 for heating an iron base 33.
A thermal element 35 for detecting a base temperature, a temperature detecting section 36 for forming a pulse signal based on a signal from the thermal element 35, and a main body for connecting the stand section 38 and supplying power to the heater 34 and the temperature detecting section 36. And an electrode 37. Reference numeral 38 denotes a stand portion to which the iron main body 32 is detachably connected and set, a stand electrode 39 connected to the main body electrode 37 of the iron main body 32, and a signal detection unit 40 for detecting the output of the temperature detection unit 36.
And a temperature control unit 41 that receives the signal from the signal detection unit 40 and controls power supply to the heater 34. Reference numeral 42 denotes a power cord of the stand unit 38. Here, the thermal element 35 detects the temperature of the base 33 and inputs a temperature signal to the temperature detecting unit 36. The temperature detecting section 36 exchanges this temperature signal with a pulse signal whose interval changes according to the temperature. This pulse signal is detected by the signal detection unit 40 of the stand unit 38 via the body electrode 37 and the stand electrode 39. The signal from the signal detection unit 40 is input to the temperature control unit 41. Temperature controller 41
Based on this temperature information, it is determined whether the base temperature of the iron main body 32 is higher or lower than the set temperature.If it is lower, the relay built in the temperature controller 41 is turned on, and if it is higher, the relay is turned off. By turning it off, the power supply to the heater 34 is controlled. When the heating of the base 33 is completed, the iron body 32
The iron is removed from the stand 38 and ironing is performed. When the temperature of the base 33 decreases, the iron main body 32 is placed on the stand 38 again to heat the base 33. Here, the correlation between the pulse interval and the base temperature is set such that the pulse interval becomes shorter as the base temperature increases, as shown in FIG.

Problems to be Solved by the Invention However, those having such a configuration must have a dedicated power supply and a pulse signal conversion circuit in the iron main body,
There has been a problem that the control circuit configuration becomes complicated and the manufacturing cost increases.

An object of the present invention is to provide a cordless iron that can simplify the iron main body and can perform highly reliable temperature control.

Means for Solving the Problems In order to solve the above problems, the present invention comprises a cordless iron comprising an iron body and a stand for setting the same, wherein the iron body includes a heater for heating a base of the iron. , A thermo-sensitive element that detects the base temperature,
A main body electrode for supplying electric power to the heater and the thermosensitive element, the stand section includes a stand electrode connected to the main body electrode of the iron main body section, a switching element and a resistor connected in series, and one end of which is connected to the main body electrode; A voltage detecting unit configured to be connected to the thermosensitive element via an electrode and the stand electrode and to apply a commercial power supply voltage to both ends of the series resistor and the thermosensitive element by a switching element to detect a divided voltage thereof; A voltage comparison unit that compares a detection voltage of the voltage detection unit with a reference voltage, and a temperature control unit that determines the base temperature from an output of the voltage comparison unit and controls power supply to the heater. It is.

Operation The present invention does not require a dedicated power supply for the iron main body by applying a commercial power supply voltage to the thermal element by the above-described configuration, and the application of the commercial power supply always maintains a good conduction state between the electrodes. Therefore, a simple configuration and highly reliable temperature control can be achieved.

Embodiment An embodiment of the present invention will be described below in detail with reference to FIGS.

FIG. 1 is a structural block diagram of a cordless iron showing one embodiment of the present invention. In the figure, 1 is an iron body, a heater 3 for heating an iron base 2,
It has a thermosensitive element 4 for detecting the temperature of the base 2 and a main body electrode 5 for supplying electric power to the heater 3 and the thermosensitive element 4. Reference numeral 6 denotes a stand on which the iron body 1 is detachably connected and set. The stand electrode 7 connected to the body electrode 5 of the iron body 1 and the temperature information of the thermosensitive element 4 are used as a divided voltage of the commercial power supply voltage. A voltage detector 8 for detecting,
A voltage comparing section 9 for comparing the detection voltage of the voltage detecting section 8 with a reference voltage; and a temperature control section 10 for judging the temperature of the base 2 from the output of the voltage comparing section 9 and controlling power supply to the heater 3.
And a power cord 11.

FIG. 2 is a circuit diagram showing a first specific example of the voltage detector 8, the voltage comparator 9, and the temperature controller 10. In the figure, reference numeral 12 denotes a power supply circuit for producing a power supply for a control circuit, which comprises a commercial power supply 13, a zener diode 14, a resistor 15, and a diode 16. Reference numeral 17 denotes a microcomputer for judging and controlling temperature information. Reference numeral 8 denotes a voltage detection unit, which forms a divided voltage with transistors 18 to 20 that perform switching according to a set temperature and the thermistor 4 that is a thermal element. It is composed of resistors 21 to 23. 9 is a voltage detector,
It has a comparator 24 for comparing the detection voltage detected by the voltage detection unit with the resistance divided value of the circuit power supply. Reference numeral 10 denotes a temperature control unit, which includes a relay 25 for controlling energization of the heater in accordance with an output result of the comparator, and a transistor 26 for controlling the relay 25.

FIG. 3 is a circuit diagram showing a second specific example of the voltage detector 8, the voltage comparator 9, and the temperature controller 10. In the figure, the voltage detecting section 8 is composed of a set of a transistor 27 and a resistor 28, and the voltage comparing section 9 has comparators 29 to 31 for switching a reference voltage according to a set temperature. FIG. 4 is a characteristic diagram showing the correlation between the temperature of the iron base 2 in FIG. 2, the output voltage of the voltage detector 8 and the reference voltage of the voltage comparator 9. FIG. 5 is a characteristic diagram showing the correlation between the temperature of the iron base 2 in FIG. 3, the output voltage of the voltage detector 8 and the reference voltage of the voltage comparator 9.

The operation of the above configuration will be described with reference to FIGS. When the temperature of the iron body 1 is set on the stand 6 and the temperature is set, the relay 25 of the temperature controller 10 is driven and the heater 3 is energized. The thermistor 4 senses the base temperature of the iron, which rises in temperature when the heater 3 is energized, and its resistance decreases in accordance with the temperature change. This resistance value is captured as a divided voltage of the commercial power supply 13 by resistors 21 to 23 provided in series with the thermistor 4 and input to the comparator 24 of the voltage comparison unit 9. At this time, the energization of the thermistor 4 is pulsed by transistors 18 to 20 in order to minimize a temperature detection error due to self-heating of the thermistor 4. FIG. 2 shows a circuit configuration in the case of having three set temperatures. The transistor 18 and the resistor 21 are a combination for setting a [low] temperature, and the transistor 19 and the resistor 22 are a combination for setting a [medium] temperature. , And transistor 20 and resistor 23
Is a combination for setting a [high] temperature, the resistance value may be set smaller as the resistance changes from the resistance 21 to the resistance 23, and the detection voltage has three characteristics as shown in FIG. Therefore, three temperatures can be determined only by setting the reference voltage of the comparator 24 at one point. FIG. 3 shows a configuration in which a combination of the transistor and the resistor of the voltage detection unit 8 is constituted by a transistor 27 and a resistor 28 as one set, and three comparators of the voltage comparison unit 9 are prepared instead. In this operation, as shown in FIG. 5, the detection voltage characteristic becomes one, but three reference voltages are used, so that three temperatures can be similarly determined.

The choice between the two embodiments may be determined in view of the space of the control circuit board and the cost of parts.

Effects of the Invention As described above, according to the present invention, according to the above-described configuration, the iron main body does not require a dedicated power supply by applying a pulse of the commercial power supply voltage to the heat-sensitive element. Because a good conduction state can always be maintained between the electrodes, a simple configuration can be achieved, and
This makes it possible to control the temperature with high reliability, and its industrial value is great.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a cordless iron according to an embodiment of the present invention. FIG. 2 is a circuit configuration diagram showing a first specific embodiment of the voltage detection unit / voltage comparison unit and the temperature control unit. The figure shows the second part of the voltage detector, voltage comparator, and temperature controller.
FIG. 4 is a characteristic diagram showing the correlation between the temperature of the base of the iron, the output voltage of the voltage detector and the reference voltage of the voltage comparator in FIG. 2, and FIG. FIG. 3 is a characteristic diagram showing the correlation between the temperature of the base of the iron, the output voltage of the voltage detector and the reference voltage of the voltage comparator in FIG. 3, and FIG. 6 is a block diagram showing the configuration of a cordless iron showing a conventional example. FIG. 7 is a characteristic diagram showing the correlation between the base temperature and the pulse interval in the conventional example. DESCRIPTION OF SYMBOLS 1 ... Iron body part, 3 ... Heater, 4 ... Thermal element, 5 ...
Main body electrode, 6 stand unit, 7 stand electrode, 8 voltage detection unit, 9 voltage comparison unit, 10 temperature control unit.

Continuation of front page (56) References JP-A-2-182300 (JP, A) JP-A-1-153193 (JP, A) JP-A-1-291900 (JP, A) JP-A-63-311998 (JP) , A) JP-A-63-150100 (JP, A)

Claims (1)

(57) [Claims] An iron body includes a heater for heating a base of the iron, a heat-sensitive element for detecting a temperature of the base, and a heater for heating the base of the iron. A main body electrode for supplying electric power, the stand section includes a stand electrode connected to the main body electrode of the iron main body section, a switching element and a resistor connected in series, one end of which is connected to the main body electrode and the stand electrode. A voltage detecting unit configured to be connected to the thermosensitive element and applying a pulse of a commercial power supply voltage to both ends of the series resistor and the thermosensitive element by a switching element to detect a divided voltage thereof; A voltage comparator for comparing the detected voltage with a reference voltage, and controlling the power supply to the heater by judging the base temperature from the output of the voltage comparator. Cordless iron comprising and a degree control unit.