JP2650719B2 - Induction heating iron - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating type iron which is a type of cordless iron.

2. Description of the Related Art Conventionally, this type of iron is configured as shown in FIG. A heating coil 4 is arranged on the back side of an ironing table 3 composed of a cushion 1 and a skin cloth 2 covering the surface thereof. A commercial power supply 6 is connected to an inverter 7 in a series circuit of the heating coil 4 and the resonance capacitor 5. A high-frequency signal whose frequency has been converted by is applied. The inverter 7 is of a half-bridge type, and includes a rectifying unit 8 for full-wave rectifying a commercial power supply voltage to convert it to a DC voltage, and first and second transistors Q1 connected in series between outputs of the rectifying unit 8. , Q2, and a drive circuit 9 that turns on the first and second transistors Q1, Q2 alternately at a predetermined cycle. In the ironing work, an object to be ironed 10 such as clothes and a handkerchief is laid on the ironing table 3 and the iron
Is performed.

SUMMARY OF THE INVENTION In such a conventional configuration, the iron body 11 is heated by induction heating due to a change in the alternating magnetic flux generated from the heating coil 4, so that the iron body 11 is directly supplied with power. This eliminates the need for a power cord, making ironing easier. However, even when another inductively heated object, for example, an iron plate, is placed on the ironing table instead of the iron body 11, the inductively heated object is induction-heated in the same manner as the iron body 11, so that there is a burn. There is a problem that there is a danger of being dangerous.

An object of the present invention is to provide an induction heating type iron that does not perform a heating operation when a non-iron body is placed on an iron table.

Means for Solving the Problems In the induction heating type iron of the present invention, a heating coil attached to the side of the ironing table is driven by an inverter to induction heat the iron body mounted on the ironing table, On the side, a pulse generating means for generating a pulse signal at predetermined time intervals, a receiving means for receiving an external response signal, and detecting a logical sum of an output signal of the receiving means and an output pulse signal of the pulse generating means An OR gate is provided, and the iron body is provided with a coupling coil electromagnetically coupled to the heating coil, and a transmission unit that transmits the response signal by detecting that the output voltage of the coupling coil has reached a predetermined value or more, The operation of the inverter is controlled by the output signal of the OR gate.

According to this configuration, when the iron main body is placed on the iron table, the heating coil driven for a very short time at the interval of the output pulse of the pulse generating means and the coupling coil of the iron main body are connected, The output voltage of the coupling coil rises above a specified value, and the transmission means of the iron body transmits a response signal. The receiving means of the ironing table receives the response signal, a heating instruction is generated in the output of the OR gate even after the output pulse is turned off, and the heating coil is continuously driven even between the next output pulse, The body is induction heated.

If something other than the iron body is placed on the iron table, the receiving means will not receive a response signal,
The heating coil is driven only at the output pulse interval of the pulse generating means, and the temperature of the induction heated object on the ironing table does not rise.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows an induction heating type iron of the present invention. On the iron table 3 side, in addition to the heating coil 4 and the inverter 7, a receiving means 12, a pulse generating means 13 and an OR gate 14 are added, and the operation of the inverter 7 is controlled by an output signal of the OR gate 14. The iron body 11 is provided with a coupling coil 15 for electromagnetically coupling with the heating coil 4 and a transmission means 16.

At the output of the pulse generating means 13 on the side of the ironing table 3, a pulse signal P which reverses to the "H" level for 10 ms at 1 second intervals is generated as shown in FIG. Is operated during a period when the pulse signal P is at the “H” level via the OR gate 14. When the iron main body 11 is placed on the iron table 3, the coupling coil 15 detects a high-frequency signal of the heating coil 4. The transmitting means 16 connected to the output of the coupling coil 15 comprises a rectifier 17, a smoothing capacitor 18, a load resistor 19, a voltage comparator 20, a signal generating unit 21, a transmitting unit 22, and batteries 23, 24. When the voltage comparator 20 detects that the voltage of the high-frequency signal detected by the coupling coil 15 has exceeded a specified value, the output signal of the signal generation unit 21 (hereinafter, referred to as a response signal) is transmitted to the transmission unit.
The signal is transmitted wirelessly from an antenna 25 connected to 22. FIG. 3A shows a response signal, which is inverted to the "H" level for 0.5 ms at 1 ms intervals.

The receiving means 12 on the side of the ironing table 3 includes an antenna 26
A receiving unit 27 that receives and demodulates the radio signal from the transmitting unit 22 detected in the above, and outputs a response signal, an amplifying unit 28, a smoothing unit 29, a set voltage generating unit 30, and a voltage comparing unit 31. . While the receiving unit 27 is receiving the wireless signal from the transmitting unit 22,
A detection signal S shown in FIG. 3B is generated at the output of the smoothing unit 29. In the voltage comparator 31, the set voltage of the set voltage generator 30
And the voltage V _S of V _R and the detection signal S is compared, the output at V _S ≧ V _R is inverted to "L" level at "H" level, V _S <V _R. Figure 3 (c) shows the setting voltage V _R. The output of the voltage comparator 31 is “H”
When inverted, the inverter 7 is instructed to operate continuously through the OR gate 14 even when the output of the pulse generating means 13 is at the "L" level, and the induction heating of the iron body 11 by the heating coil 4 is continued. And the iron body 11
Temperature rises.

When an inductively heated object other than the iron body 11 is placed on the ironing table 3, no response signal is generated, so that the output level of the smoothing section 29 is "L" level and the output of the voltage comparing section 31 is "L". The inverter 7 is operated only during the period when the output pulse of the pulse generating means 13 is at the "H" level without being inverted to the "H" level.

When the iron main body 11 is placed on the iron table 3, the peak value of the terminal voltage of the coupling coil 15 increases as the distance between the iron main body 11 and the heating coil 4 becomes shorter. By changing the set reference voltage, the effective range of induction heating of the iron body 11 on the ironing table 3 can be freely set.

In the above embodiment, the signal generated by the signal generator 21 does not include the temperature information of the base surface of the iron body 11, but the temperature information is added and transmitted to the iron table 3 side. By controlling the inverter 7, the base surface temperature of the iron body 11 can be set freely.

In the above embodiment, the batteries 23 and 24 were required for the iron body 11, but this was achieved by supplying a DC voltage obtained by rectifying and smoothing a high-frequency signal generated in the coupling coil 15 to each part. Thus, the batteries 23 and 24 can be made unnecessary.

Effect of the Invention As described above, according to the present invention, on the side of the ironing table provided with the heating coil and the inverter, a pulse generating means for generating a pulse signal at predetermined time intervals and a response signal from the outside are received. A receiving means, an OR gate for detecting a logical sum of an output signal of the receiving means and an output pulse signal of the pulse generating means, an engagement coil electromagnetically coupled to the heating coil, and an output of the coupling coil; Transmission means for transmitting the response signal by detecting that the voltage has reached a prescribed value or more is provided, and the operation of the inverter is controlled by the output signal of the OR gate. When the iron is placed on the ironing table and the heating coil and the coupling coil of the iron are electromagnetically coupled, A response signal is transmitted from the transmitting means of the iron body to the receiving means on the side of the iron table, the receiving means instructs the inverter to perform continuous operation via the OR gate, and the iron body is induction-heated. On the other hand, when an inductively heated object other than the iron body is placed on the ironing table, the receiving means does not receive the response signal, and therefore, the inverter remains in the operating state according to the cycle of the pulse signal of the pulse generating means. Because it does not shift to the state of continuous operation such as the case where the main body is placed, there is no such thing as the induction heated object other than the iron main body being heated by induction heating,
The safety is greatly improved as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of an induction heating iron of the present invention, FIGS. 2 and 3 are waveform diagrams of main parts of the same device, and FIG. 4 is a configuration diagram of a conventional induction heating iron. . 3 ... ironing table, 4 ... heating coil, 7 ... inverter, 11 ... iron body, 12 ... receiving means, 13 ...
... pulse generating means, 14 ... OR gate, 15 ... coupling coil, 16 ... transmitting means.

Claims (1)

(57) [Claims] 1. An induction heating type iron for inductively heating an iron body mounted on the ironing table by driving a heating coil mounted on the ironing table side by an inverter, wherein a predetermined time is provided on the ironing table side. A pulse generating means for generating a pulse signal every time, a receiving means for receiving an external response signal, and an operation of the inverter by a logical sum of an output signal from the receiving means and a pulse signal output from the pulse generating means An OR gate is provided for controlling the power supply. The iron body has a coupling coil electromagnetically coupled to the heating coil by a pulse signal from the pulse generating means, and a transmission signal for transmitting a response signal when an output value of the coupling coil is equal to or greater than a predetermined value. Means, the output signal of the receiving means and the pulse generating means for receiving the response signal, Induction heating iron to control the operation of serial inverters.