JPH03106400A - Cordless iron - Google Patents

Abstract

PURPOSE:To enable temperature control with simple constitution and high reliability by applying pulsating commercial line voltage to a heat sensitive element to keep always a satisfactory conductive condition between electrodes. CONSTITUTION:There are provided with a heater 3 for heating a base 2 of an iron, a heat sensitive element 4 for detecting the temperature of the base 2 and a body electrode 5 for supplying electric power to the heater 3 and heat sensitive element 4. When an iron body 1 is set on a stand 6 to set a temperature, a relay 25 in a temperature controller 10 is worked to electrify the heater 3. A thermistor 4 detects the base temperature of the iron having the temperature rise due to the power supply to the heater 3 and reduces its resistance value according to a change in the temperature. This resistance value is caught as the potential voltage of a commercial power supply 13 by resistances 21-23 provided in series to the thermistor 4 and is to be inputted to a comparator 24 in a voltage comparating section 9. Then, the applying electricity to the thermistor 4 is pulsated by transistors 18-20 to restrain a temperature detecting error due to the self-exothermic reaction of the thermistor 4.

Description

[Detailed Description of the Invention] Industrial Application The present invention does not have a power cord in the iron body, and when the iron body is set on the stand, power is supplied from the stand to the heater built in the iron body. The present invention relates to a coatless iron that is supplied and heated.

2. Description of the Related Art Conventionally, for this type of coatless iron, a method has been proposed in which a signal from a heat-sensitive element built into the iron body is transmitted to a temperature control section in a stand section. However, with this type of configuration, the current flowing through the heat-sensitive element is weak and the voltage is also small, resulting in poor continuity between the electrodes that transmit temperature signals, making it impossible to control the temperature properly. It was something. On the other hand, as an improvement to this method, a method has also been proposed in which the temperature signal of the iron body is converted into a pulse signal and transmitted to the stand. This method is the sixth
This will be explained based on the diagram and FIG. 7. In the figure, 32 is the iron main body, which includes a heater 34 that heats the base 33 of the iron, a heat sensitive element 35 that detects the base temperature, and a temperature detection section 3 that forms a pulse signal based on the signal of the heat sensitive element 35.
6, and a main body electrode 37 connected to the stand section 38 and for supplying power to the heater 34 and the temperature detection section 36. 38 is a stand part to which the iron main body part 32 is detachably connected and set; a stand electrode 39 connected to the main body electrode 37 of the iron main body part 32;
6, and a temperature control section 41 that receives the signal from the signal detection section 40 and controls power supply to the heater 34. 42 is the stand part 38
This is the power cord. Here, the thermal element 35 is the base 3
3 is detected and a temperature signal is input to the temperature detection section 36. The temperature detection section 36 converts this temperature signal into a pulse signal whose interval changes depending on the temperature. This pulse signal is detected by the signal detection section 40 of the stand section 38 via the main body electrode 37 and the stand electrode 39. This signal from the signal detection section 40 is input to the temperature control section 41.

The temperature control section 41 determines whether the base temperature of the iron body section 32 is higher or lower than the set temperature based on this temperature information,
When the temperature is low, a relay built into the temperature control unit 41 is turned on, and when the temperature is high, the relay is turned off to control the energization of the heater 34. Once the base 33 has been heated, the iron main body 32 is removed from the stand 38 and ironing is performed, and when the temperature of the base 33 drops, the iron main body 32 is placed again on the stand 38 and the base 33 is heated. be. Here, the correlation between the pulse interval and the base temperature is set such that the pulse interval becomes shorter as the base temperature rises, as shown in "4" in FIG.

Problems to be Solved by the Invention However, irons with such a configuration require a dedicated power supply and pulse signal conversion circuit in the iron body, which results in a complicated control circuit configuration and high manufacturing costs. had.

The present invention has been made to solve the above problems, and aims to provide a cordless iron that has a simplified 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 consisting of an iron body and a stand on which the iron is set, and the iron body has a heater that heats the base of the iron. a heat-sensitive element for detecting base temperature; and a main body electrode' for supplying power to the heater and the heat-sensitive element.
The stand part has a stand electrode connected to the main body electrode of the iron main body part, a switching element and a resistor connected in series, and one end of which is connected to the front heat-sensitive element via the main body electrode and the stand electrode. A voltage detection section that applies a pulse of commercial power supply voltage to both ends of the connected series resistor and the heat-sensitive element using a switching element and detects the divided voltage thereof, and a detection voltage of the voltage detection section and a reference voltage. and a temperature control section that determines the base temperature from the output of the voltage comparison section and controls power supply to the heater.

Effect of the present invention With the above-described configuration, the iron main body does not require a dedicated power source by applying a pulse of commercial power voltage to the heat-sensitive element, and by applying this commercial power voltage, a good conductive state is always maintained between the electrodes. Since it can be done easily, it is possible to have a simple structure and highly reliable temperature control.

EXAMPLE Hereinafter, an example of the present invention will be described in detail based on FIGS. 1 to 5.

FIG. 1 is a block diagram of a cordless iron showing an embodiment of the present invention. In the figure, reference numeral 1 denotes the iron main body, which includes a heater 3 that heats the base 2 of the iron, a heat-sensitive element 4 that detects the temperature of the base 2'', and a main body electrode 5 that supplies power to the heater 3 and the heat-sensitive element 4. Reference numeral 6 denotes a stand part to which the iron main body part 1 is detachably connected and set, and a stand electrode 7 connected to the main body electrode 5 of the iron main body part 1 and the temperature information of the heat sensitive element 4 are connected to the commercial power supply voltage. A voltage detecting section 8 detects the voltage as a divided voltage, a voltage comparator section 9 compares the detected voltage of the voltage detecting section 8 with a reference voltage, and a voltage comparator section 9 judges the temperature of the base 2 from the output of the voltage comparator section 9, Temperature control unit 10 that controls power supply to
and a power cord 11.

FIG. 2 is a circuit configuration diagram showing a first specific example of the voltage detection section 8, the voltage comparison section 9, and the temperature control section 10. In the figure, 12 is a power supply circuit for generating power for the control circuit, and is composed of a commercial power supply 13, a Zener diode 14, a resistor 15, and a diode 16. l7 is a microcomputer that judges and controls temperature information, 8 is a voltage detection section,
Transistor 1 that switches according to the set temperature
8 to 20 and resistors 21 to 23 for forming a divided voltage with the thermistor 4, which is a heat sensitive element. Reference numeral 9 denotes a voltage detection section, which has a comparator 24 that compares the detected voltage detected by the voltage detection section with the resistance divided voltage value of the circuit power supply.

Reference numeral 10 denotes a temperature control section, which includes a relay 25 that controls energization of the heater according to the output result of the comparator;
It is composed of a transistor 26 that performs control.

FIG. 3 is a circuit configuration diagram showing a second specific example of the voltage detection section 8, the voltage comparison section 9, and the temperature control section 10. In the figure, the voltage detection section 8 consists of a pair of transistor 27 and resistor 28.
The voltage comparison section 9 has comparators 29 to 31 for switching the reference voltage according to the set temperature. FIG. 4 is a characteristic diagram showing the correlation between the temperature of the base 2 of the iron, the output voltage of the voltage detection section 8, and the reference voltage of the voltage comparison section 9 in FIG. FIG. 5 is a characteristic diagram showing the correlation between the temperature of the base 2 of the iron, the output voltage of the voltage detection section 8, and the reference voltage of the voltage comparison section 9 in FIG.

The operation of the above configuration will be explained based on FIGS. 1 to 5. When the iron main body part 1 is set on the stand part 6 and the temperature is set, the relay 25 of the temperature control part 10 is activated and the heater 3 is energized.

7 The thermistor 4 senses the base temperature of the iron, which increases when the heater 3 is energized, and its resistance value decreases in accordance with the temperature change. This resistance value is captured as a divided voltage of the commercial power supply 13 by the resistors 21 to 23 provided in series with the thermistor 4, and is input to the comparator 24 of the voltage comparison section 9. At this time, the thermistor 4 is energized in pulses by the transistors 18 to 20 in order to minimize temperature detection errors due to self-heating of the thermistor 4.

Figure 2 shows the circuit configuration when there are three temperature settings, where the transistor 18 and resistor 21 are used as a combination for setting the low 1st temperature, and the transistor 19 and resistor 22 are used as the combination for setting the medium 1st temperature. , further transistor 20 and resistor 2
When 3 is used as a combination for high 1 temperature setting, the resistance value may be set smaller as the resistor 21 becomes the resistor 23, and the detection voltage has three characteristics as shown in FIG.

Therefore, three temperatures can be determined by simply setting the reference voltage of the comparator 24 at one point. or,
In FIG. 3, a combination of a transistor 8 and a resistor of the voltage detecting section 8 is made up of a transistor 27 and a resistor 28, and three comparators of the voltage comparing section 9 are prepared instead. As shown in FIG. 5, the operation is such that there is only one detection voltage characteristic, but there are three reference voltages, so three temperatures can be determined in the same way.

The selection between these two embodiments may be determined from the viewpoint 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, with the above-described configuration, the commercial power supply voltage is applied in pulses to the heat-sensitive element, so that the iron main body does not require a dedicated power supply. As a result, a good electrical conduction state can always be maintained between the electrodes, making it possible to achieve highly reliable temperature control even with a simple structure, and its industrial value is great.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the configuration of a cordless iron showing one embodiment of the present invention, and FIG. 2 is a circuit diagram showing a first specific embodiment of the voltage detection section, voltage comparison section, and temperature control section.
Fig. 3 is a circuit diagram showing a second specific embodiment of the voltage detection section, voltage comparison section, and temperature control section, and Fig. 4 shows the temperature and voltage detection section of the base of the iron in Fig. 2. Characteristic diagram showing the correlation between the output voltage and the reference voltage of the voltage comparator, 5th
The figure is a characteristic diagram showing the correlation between the temperature of the base of the iron, the output voltage of the voltage detection unit, and the reference voltage of the voltage comparison unit in Figure 3, and Figure 6 is a configuration block diagram of a conventional cordless iron. , FIG. 7 is a characteristic diagram showing the correlation between base temperature and pulse interval in a conventional example. ■...Iron body part, 3...Heater, 4...Heat-sensitive element, 5...Body electrode, 6...Stand part, 7...
... Stand electrode, 8... Voltage detection section, 9... Voltage comparison section, 10... Temperature control section.

Claims (1)

[Claims] The iron body includes a heater that heats the base of the iron, a heat-sensitive element that detects the base temperature, and a main body that supplies power to the heater and the heat-sensitive element. The stand part has a stand electrode connected to the main body electrode of the iron main body part, a switching element and a resistor connected in series, one end of which connects to the heat sensitive element via the main body electrode and the stand electrode. a voltage detection unit that applies a pulse of commercial power supply voltage across the series resistor and the heat-sensitive element to detect a divided voltage thereof; and a detection voltage of the voltage detection unit and a reference voltage. 1. A cordless iron comprising: a voltage comparison section that performs a comparison between the voltage comparison section and the temperature control section that determines the base temperature from the output of the voltage comparison section and controls power supply to the heater.