JPH0351200B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention does not have a power cord in the iron body, and when the iron body is installed on the stand,
This invention relates to a cordless iron in which power is supplied from a stand to a heater in an iron main body.

BACKGROUND ART Conventionally, temperature control in this type of cordless iron has generally been performed using a thermostat in the iron body, but there is a problem in that the temperature peak value is large. To solve this problem, the applicant has proposed a system in which signals from the sensing element are transmitted to the temperature control circuit using electrodes. This is shown in FIG. 1 is the base of the iron, 2 is a heater that heats the base 1 of the iron, 3 is a detection element that detects the temperature of the base 1, 4 is the main body of the iron, no power cord is attached, heater 2 is connected to the electrode P ₁ , _P2 is connected to electrodes _P3 and _P4 of the stand section 6, and power is supplied by the temperature control circuit 5 to control the temperature. A power cord 7 is attached to the stand portion 6, which enables power to be supplied to the heater 2. The sensing element 3 built into the iron body 4 is connected to the input electrodes P ₇ and P ₈ of the temperature control circuit 5 of the stand 6 through electrodes P ₅ and P ₆ , so that the temperature information of the iron body 4 can be detected. Temperature control circuit 5 of stand section 6
is input.

Problems to be Solved by the Invention However, with such a structure, the detection element 3
Since the current flowing between electrodes P 5 and P ₇ is weak (several μA) and the voltage is also small (about ₅ V),
The conduction between P ₆ and P ₈ becomes poor, and the signal transmission between the iron body part 4 and the stand part 6 cannot be performed properly.
Highly reliable temperature control was not possible.

Therefore, an object of the first invention is to provide a cordless iron that enables accurate signal transmission and highly reliable temperature control by converting temperature information into other signal information and transmitting the signal information. It is something to do.

The second invention also provides a cordless iron that eliminates the problem of poor conductivity between electrodes by transmitting signals between the iron main body and the stand in a non-contact manner, allowing highly reliable temperature control. The purpose is to

Means for Solving the Problems The technical means of the first invention is that the iron body includes a heater that heats the base of the iron, a detection element that detects the temperature of the base, and a temperature information of the detection element. It has temperature information transmitting means for converting into other signal information and transmitting it, and a power supply terminal connected to the heater circuit, and the stand part has temperature information transmitting means for receiving the output signal from the temperature information transmitting means. The cordless iron has a receiving means, a temperature control circuit section that controls energization of the heater based on a signal from the temperature information receiving means, and an electrode that connects the temperature control circuit section and the heater circuit.

Further, the technical means of the second invention is that the iron body includes a heater that heats the base of the iron, a detection element that detects the temperature of the base, and a process that converts the temperature information of the detection element into other signal information. and a power supply terminal connected to the heater circuit, and the stand section includes temperature information receiving means for receiving the output signal from the temperature information transmitting means in a non-contact state. This cordless iron has a temperature control circuit section that controls energization of the heater based on a signal from a temperature information receiving means, and an electrode that connects the temperature control circuit section and the heater circuit. The specific means for transmitting signals between the iron body and the stand is a light emitting element and a light receiving element.

Effect The effect of the technical means of the first invention is as follows. In the iron body, the temperature of the base is detected by a sensing element, and this temperature information is input to the temperature information transmitting means. This temperature information transmitting means converts temperature information into other signal information and transmits it. On the other hand, in the stand section where the iron main body is installed, the temperature information receiving means receives an output signal from the temperature information transmitting means of the iron main body, and inputs the signal to the temperature control circuit section. The power supply to the heater is controlled by the signal from this temperature control circuit section. With this configuration, temperature information is converted into other signal information and sent from the iron body to the stand, so there is no problem like in the past, and accurate and reliable temperature control can be performed.

Further, the effect of the technical means of the second invention is as follows. The temperature information of the sensing element is converted into other signal information and sent from the iron body to the stand, and the signal is transmitted in a non-contact manner.
There are no problems like conventional ones due to poor conductivity of the electrodes,
Accurate and reliable temperature control is possible.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 10 denotes an iron main body, which includes a heater 12 that heats the base 11 of the iron, a detection element 13 that detects the base temperature,
A light emitting element drive circuit section 14 driven by temperature information of the sensing element 13, a light emitting element 15 that emits light based on a signal from the light emitting element drive circuit section 14, and electrodes _P1 , _P2 for detachably connecting to the stand section. , P ₆ . 16 is a stand part on which the iron body part 10 is detachably installed and which supplies power during installation;
A light receiving element 17 that receives the optical signal from the light emitting element 15
, a temperature control circuit section 18 that receives a signal from the light receiving element 17 and controls power supply to the heater 12, and an electrode P ₁ on the side of the temperature control circuit section 18 and the iron body section 10,
It has electrodes P ₃ , P ₄ , and P ₅ that connect P ₂ and P ₆ . Reference numeral 19 indicates a power cord for the stand portion 16.

The light emitting element driving circuit section 14 and the light emitting element 15 are connected to a temperature information transmitting means 20 that converts the temperature information of the sensing element 13 into other signal information and transmits the signal information.
The light-receiving element 17 constitutes a temperature information transmitting means 20.
Temperature information receiving means 21 for receiving an output signal from
It consists of These temperature information transmitting means 20,
The temperature information receiving means 21 constitutes a technical means of the first invention that converts the temperature information of the detection element 13 of the iron main body part 10 into other signal information, transmits it, and receives it at the stand part 16. Also, light emitting element 1
5. The light receiving element 17 is a second element that transmits signals from the iron body part 10 to the stand part 16 in a non-contact manner.
constitutes a specific means of the invention.

Figure 2 shows the iron main body part 10 and the stand part 16.
This shows the circuit configuration of the iron main body 10 installed on the stand 16 to control the temperature. The iron body 10 includes a resistor R ₄ , a diode D ₃ , a capacitor C ₂ , and a Zener diode ZD ₂ , and constitutes a power supply circuit that obtains a DC voltage from a power supply. Also, sensing element 1
It also has a light emitting element drive circuit section 14 which inputs temperature information from 3 and drives the light emitting element 15, and a resistor _R7 for limiting the current of the light emitting element 15. Next, the stand portion 16 includes a resistor R ₁ , a diode D ₁ , a capacitor C ₁ , and a Zener diode ZD ₁ , which constitute a power supply circuit that obtains a DC voltage from an AC power supply V _AC . In addition, the temperature control circuit section 18 and the resistor
It also has R ₆ , relay Ry, relay switch SW ₁ and diode D ₂ . The light receiving element 17 of the stand section 16 receives the optical signal from the light emitting element 15, converts it into an electrical signal, and transmits the light signal to the temperature control circuit section 1.
8 is entered. The temperature control circuit unit 18 determines whether the base temperature of the iron body is higher or lower than the set temperature based on the signal from the light receiving element 17, and if it is lower, turns on relay Ry and closes SW ₁ ,
If it is high, relay Ry is turned off and SW ₁ is opened. This controls the temperature of the heater 12.

FIG. 3 shows an embodiment of the light emitting element drive circuit section 14. As shown in FIG.

The AC power supply V _AC is connected to the power supply P ₁ , P ₃ ,
It is supplied to the iron body via P ₅ and P ₆ . resistance
R ₄ , R ₉ , diode D ₃ , Zener diode
ZD ₂ , capacitors C ₂ and C ₃ are a power supply circuit that generates a DC power supply.

As the temperature of the sensing element 13 increases, its resistance value decreases. The configuration is such that a constant current flows through the capacitor C ₄ using the resistors R ₁₀ and R ₁₁ and the transistor Q ₄ . _R12 is for compensating that the resistance value of the sensing element 13 becomes very large at low temperatures. Diode _D4 was used for temperature compensation. IC ₁ is an operational amplifier, and the terminal voltage of capacitor C ₄ due to the charging current flowing through capacitor D ₄ is input to its negative input terminal. Arithmetic amplifier IC ₁
The + input terminal of is connected to resistors R ₁₃ , R ₁₄ , and R ₁₅ as shown in the figure to create a reference voltage. now operational amplifier
When the − input terminal voltage e ₁ of IC ₁ is lower than the + input terminal voltage e ₂ of operational amplifier IC ₁ , the output voltage of operational amplifier IC ₁ is at a high level, and the operational amplifier IC ₁ at this time
If the + input terminal e ₂ of the is set as e _2H , then e _2H ≒ V ₂ · R ₁₅ /R ₁₃ R ₁₄ + R ₁₅ .

V ₂ is the power supply voltage of operational amplifier IC ₁ . When the capacitor _C4 is charged and _e1 becomes high and _e1 exceeds _e2H , the output of the operational amplifier _IC1 becomes low level. Therefore, the voltage at e ₂ becomes smaller. At this time
If e ₂ is e _2L , then e _2L ≒ V ₂ · R ₁₄ R ₁₅ /R ₁₃ + R ₁₄ R ₁₅ .

IC ₂ is a comparator, and the reference voltage created by resistors R ₁₆ and R ₁₇ is input to the + input terminal. -The output voltage of operational amplifier IC ₁ is input to the input terminal. That is,
When the output voltage of operational amplifier IC ₁ is high level, the output voltage of comparator IC ₂ is low level, and the output voltage of operational amplifier IC 1 is low level.
When the output voltage of IC ₁ is low level, the output voltage of comparator IC ₂ is high level. A transistor Q ₃ is connected to the output terminal of the comparator IC ₂ through resistors R ₁₈ and R ₁₉ to be driven. moreover
The transistor Q ₂ is connected to be driven through R ₅ and R ₆ . The collector of transistor Q ₃ is connected to capacitor C ₄ through resistor R ₂₀ , and when the output level of comparator IC ₂ is high level, transistor Q ₃ is turned on, and the charge in capacitor C ₄ is transferred to resistor R ₂₀ and transistor Q ₃ . It is configured to discharge electricity through the

Furthermore, when the output of comparator IC ₂ is at high level,
The transistor Q ₂ is turned on and a current flows through the light emitting element (LED) 15 connected to the collector of the transistor Q ₂ , causing the light emitting element 15 to emit light. The light emitted from the light emitting element 15 is received by the light receiving element 17 installed on the stand side, and the temperature is detected by the temperature control circuit section 18 and temperature control is performed.

FIG. 4 shows the voltage waveform of the important part of FIG. 3.
In Figure 4, a is the terminal voltage e ₁ of capacitor C ₄
shows. Since the current is constant during charging (when the voltage increases), e ₁ increases linearly. Voltage e ₁ is operational amplifier
When the output voltage e 3 of the comparator IC 2 is lower than the + input terminal e _2H of IC ₁ , the output voltage e ₃ of the comparator IC ₂ is at a low level, and no current flows to the light emitting element 15, so no light is emitted. When e ₁ rises and reaches the + input terminal e _2H of operational amplifier IC ₁ , the output voltage e ₃ of comparator IC ₂ becomes high level as shown in Figure 4b, and current flows to light emitting element 15, which emits light. . At the same time, when e ₃ becomes high level, transistor Q ₃ turns on, and the charge in capacitor C ₄ is transferred to resistor R ₂₀ and transistor Q ₃
discharge through. When e ₁ decreases due to discharge and reaches e _2L , the output of operational amplifier IC ₁ becomes high level again, the output of comparator IC ₂ becomes low level, the light emitting element 15 turns off, and charging of capacitor C ₄ starts. do. The waveform in FIG. 4C is the collector voltage waveform _e4 of the light receiving element (phototransistor) 17. When the light emitting element 15 lights up, the light receiving element 17 turns on and e ₄
is at a low level, and when the light emitting element 15 is not lit, the light receiving element 15 is off and at a high level. Then, the time t ₁ when e ₄ is at the high level is measured, and the base temperature of the iron main body 10 is detected. As the base temperature rises, the resistance value of the heat-sensitive element 13 decreases, so the charging time for the capacitor _C4 becomes shorter, and therefore the high level time of _e4 becomes shorter.
t ₁ becomes shorter. This time t ₁ can be approximately expressed by the following formula.

t ₁ = ΔV/V ₂ −V _E・(R _th R ₁₂ )・C ΔV=e _2H −e _2L V _E : Emitter voltage of transistor Q ₂ In Figure 5, the horizontal axis is the base temperature of the iron, and the vertical axis is shows a graph taken at time t ₁ of the high level of e ₄ .

As mentioned above, t ₁ changes continuously depending on the temperature, so read this time t ₁ , detect the temperature of the base 11 of the iron, compare it with the set temperature, and if the base temperature is lower than the set temperature, A current is passed through the heater 12, and if the base temperature is higher than the set temperature, the current is turned off to control the temperature.

In addition, as another implementation circuit example, a detection element is used as a part of the circuit element of an astable multivibrator,
It may also be possible to detect that the oscillation period varies depending on the temperature. Further, in the embodiment, the temperature information is transmitted as an optical signal, but it is obvious that the present invention is not limited to this as long as the temperature information is converted into other signal information.

Effects of the Invention As described above, the first invention eliminates the inconvenience caused by poor conductivity and achieves extremely reliable temperature control by converting the temperature information of the iron body into other signal information and transmitting it to the stand. It is possible to provide a cordless iron that can be used.

In addition, the second invention eliminates the problem of poor conduction between the electrodes by converting the temperature information of the iron body into other signal information and transmitting the signal to the stand in a non-contact manner. It is possible to provide a cordless iron whose temperature can be controlled.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a cordless iron showing an embodiment of the present invention, Fig. 2 is a circuit block diagram of an optical transmission system according to an embodiment of the invention, and Fig. 3 is a circuit diagram for generating the optical signal. , Fig. 4 is a voltage waveform diagram of the essential parts of the circuit of Fig. 3, Fig. 5 is a characteristic diagram of temperature and detection time according to an embodiment of the present invention, and Fig. 6 is a block diagram showing the cordless iron proposed so far. It is a diagram. 10...Iron body part, 11...Base, 12...
Heater, 13... Detection element, 14... Light emitting element drive circuit section, 15... Light emitting element, P1 _{to P4 ...} Electrode, 16...
Stand section, 17... Light receiving element, 18... Temperature control circuit section, 20... Temperature information transmitting means, 21... Temperature information receiving means.

Claims (1)

[Claims] 1. An iron main body, and a stand that supplies power when the iron main body is installed, and the iron main body includes a heater that heats the base of the iron, and a detection element that detects the temperature of the base. and temperature information transmitting means for converting and transmitting the temperature information of the sensing element into other signal information, and an electrode connected to a heater circuit, and the stand section is configured to transmit the output from the temperature information transmitting means. A cordless iron comprising a temperature information receiving means for receiving a signal, a temperature control circuit section for controlling energization to a heater based on a signal from the temperature information receiving means, and an electrode connecting the temperature control circuit section and the heater circuit. 2. The iron main body includes a stand that supplies power when the iron main body is installed, and the iron main body includes a heater that heats the base of the iron, a detection element that detects the temperature of the base, and a stand that supplies power when the iron main body is installed. The stand part includes a temperature information transmitting means for converting information into other signal information and transmitting the same, and an electrode connected to the heater circuit, and the stand section transmits the output signal from the temperature information transmitting means in a non-contact state. A cordless iron comprising: temperature information receiving means for receiving temperature information; a temperature control circuit section for controlling energization of the heater according to a signal from the temperature information receiving means; and electrodes for connecting the temperature control circuit section and the heater circuit. 3. The cordless iron according to claim 2, wherein the temperature information transmitting means includes a light emitting element, and the temperature information receiving means includes a light receiving element that receives an optical signal from the light emitting element.