JP2855929B2 - Cordless equipment - 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 device used in ordinary households that operates cordlessly.

[0002]

2. Description of the Related Art Conventionally, cooking appliances such as coffee mills and jar pots have a power cord, and are connected to an outlet provided on a wall of a house or the like and function with a commercial AC power supply. .

FIG. 4 shows a coffee mill which is an example of such a conventional apparatus. This coffee mill has a power cord 1 for drawing AC100V power from an outlet, a motor 2, a switch 3 for turning on / off the power supplied to the motor 2, and a blade 4 rotated by the motor 2. .

[0004] A user connects the power cord 1 to an outlet provided on a wall of a house or the like to use the motor 2 when using the motor.
To supply power.

FIG. 5 shows a jar pot which is also an example of a device according to the prior art. Reference numeral 5 denotes a power cord for drawing 100 V AC power from an outlet, 6 denotes a hot water storage tank, and 7 denotes a heater. Reference numeral 8 denotes a thermistor for detecting a water temperature, which supplies this signal to a control circuit 9. Reference numeral 10 denotes a power supply circuit.

[0006] The user connects the power cord 5 to an outlet provided on a wall of a house or the like at the time of use, and
To heat the water in the tank 6. When the water temperature in the tank 6 rises, the thermistor 8
, The control circuit 9 controls the heater 7 to cut off the current. Thus, the water temperature is controlled so as to be always in a boiling state. The control circuit 9 is generally constituted by a microcomputer or the like, and the necessary low voltage is supplied from a power supply circuit 10 using a transformer.

[0007]

In these prior arts, all devices have a power cord for supplying power. For this reason, especially when using a device such as a coffee mill, the power cord 1 must be connected to an outlet despite a short use time. Also, when using after use,
Disassembling the power cord is cumbersome. Also, the power cord often becomes a bottleneck in design.

[0008] Further, thermal equipment such as a jar pot has a built-in heater, so that it becomes heavy.

SUMMARY OF THE INVENTION The present invention is intended to solve such a problem of the conventional configuration, and provides a cordless apparatus which can realize a rotary cooking appliance such as a coffee grinder in a cordless manner and can also be used as an induction heating cooking machine. Its primary purpose is to provide.

It is a second object of the present invention to provide a cordless device which can realize a heating device such as a jar pot in a cordless manner and can also be used as an induction heating cooker.

[0011]

A first means of the present invention for achieving the first object comprises a magnetism generating section and a load section, and the magnetism generating section has a top for mounting the load section. A plate, a primary coil provided under the top plate for generating a high-frequency magnetic field, an inverter for driving the primary coil, a receiving unit, and a pan detecting unit for detecting the presence or absence of a pan, and the load unit includes: A secondary coil magnetically coupled with the primary coil, transmitting means, and a load circuit supplied with power from the secondary coil, wherein the inverter has the receiving means receiving a predetermined signal from the transmitting means. A cordless device that supplies a high-frequency current to the primary coil when the pan and the pan detection unit detect that a pan is present on the top plate.

A second means of the present invention for achieving the second object comprises a magnetism generating section and a load section, wherein the magnetism generating section includes a top plate for mounting the load section, A primary coil provided under the plate for generating a high-frequency magnetic field, an inverter for driving the primary coil, a receiving unit, and a pan detecting unit for detecting the presence or absence of a pan; the load unit includes a transmitting unit and the The inverter has a metal heating part that is induction-heated by receiving a magnetic field of a primary coil, and the inverter receives a signal from the pan detection unit when the reception unit receives a predetermined signal from the transmission unit. A cordless device that operates in such a case and supplies a high-frequency current to the primary coil.

[0013]

The first means of the present invention operates as follows.
When a transmission signal provided by a transmission unit provided in the load unit is received by a reception unit provided in the magnetism generation unit, the inverter operates to supply a high-frequency current to the primary coil. As a result, a voltage is generated in the secondary coil magnetically coupled to the primary coil, and the voltage is supplied to the load circuit to operate the cordless device. For this reason, if only the power supply of the magnetism generating unit is connected, the power supply cord on the load side, which is required in the related art, becomes unnecessary. If the enamel pan / stainless steel pan is placed on the top plate, it operates as an induction heating cooker by the action of the pan detection means.

According to a second aspect of the present invention, when a transmission signal provided by a transmission means provided in a load section is received by a reception means provided in a magnetic generation section, an inverter operates to supply a high-frequency current to a primary coil. The high-frequency magnetism acts so that the metal heat-generating portion is induction-heated. If this heat is used, various functions such as boiling water can be realized cordlessly. Therefore, as with the first means of the present invention, if only the power supply of the magnetism generating section is connected, the power supply cord on the load side becomes unnecessary. In addition, the point of acting as induction heating cooking by itself is the same as in the first means of the present invention.

[0015]

FIG. 1 shows a cordless device according to an embodiment of the first means of the present invention. Reference numeral 11 denotes a magnetism generating unit, 12 denotes a load unit, and the load unit 12 is operated by the magnetism generating unit 11. The magnetism generating unit 11 receives the transmission signal of the transmitting unit 25 and modulates the amplitude by receiving a ceramic top plate 13 on which the load unit 12 is mounted, a disk-shaped primary coil 14 provided below the top plate 13, and a transmission signal. Receiving means 15 for demodulating and transmitting a signal to the inverter 17; pan detecting means 16 for judging whether or not a pan is present on the top plate 14 based on the relationship between the voltage at both ends of the primary coil 14 and power consumption; Fifteen
And an inverter 17 for receiving a signal from the pan detecting means 16 and supplying a high-frequency current of about 25 kHz to the primary coil 14 in response thereto. 18 is the primary coil 1
4 is a cooling fan for escaping heat generated by the inverter 4 and the outside of the magnetic generation unit 11. 19 is a power cord.

In this embodiment, the load section 12 is a coffee grinder having a function of grinding coffee beans. Reference numeral 20 denotes a secondary coil that magnetically couples with the primary coil 14 when the load unit 12 is placed on the top plate 13. A rectifying and smoothing circuit 21 converts the output of the secondary coil 20 into a direct current by rectifying and smoothing the output. A push button switch 23 opens and closes a motor 22 that operates on the DC power supplied from the rectifying / smoothing circuit 21. The motor 22 and the switch 23 constitute a load circuit 24. 25 is approximately 300M by the voltage supplied from the rectifying and smoothing circuit 21.
This is a transmission unit that outputs a radio wave obtained by amplitude-modulating a carrier wave of 3 Hz with a pulse of 3 kHz. The 3 kHz used for the modulation is not necessarily limited to a pulse, but may be a sine wave, for example. Reference numeral 26 denotes a blade which is rotated by the motor 22, and cuts the inputted coffee beans into an appropriate size.

The operation of the embodiment will be described below. The power cord 19 constituting the magnetism generator 11 is connected to an outlet by a user. In this state, the load unit 12 is placed on the top plate 13. At this moment, no high frequency magnetism is supplied to the secondary coil 20,
The output of the rectifying / smoothing circuit 21 is zero. Therefore, no power is supplied to the transmission means 25 and no radio wave is output.

On the other hand, the pan detecting means 16 includes the top plate 1
First, a signal is sent to the inverter 17 to activate the inverter 17 in order to detect whether or not a pot is present on 3. When the inverter 17 is started, the pan detecting means 16 sends a signal to the inverter 17 when a pan is present on the top plate 13 to the inverter 17 when there is no pan. Output.

As shown in FIG. 1, when the load portion 12 is placed on the top plate 13, the power consumption is small in spite of the large voltage of the primary coil 20 as compared with the case where the pot is placed. There is a characteristic. In the present embodiment, the pan detection means 16 makes a determination of "no pan" using this characteristic. However, the following operation is performed during the above-mentioned approximately 150 msec, and consequently the inverter 1
7 continuously supplies a high-frequency current to the primary coil. First, a high-frequency magnetic field generated from the primary coil 14 is linked with the secondary coil 20, and a high-frequency voltage is generated between both terminals of the secondary coil 20. This high frequency voltage is applied to the rectifying and smoothing circuit 21 and is converted into a DC voltage. This DC voltage is applied to the transmitting means 25, and the transmitting means 25 starts operating. The transmitting means 25 outputs a radio wave obtained by amplitude-modulating a carrier of about 300 MHz with a pulse of 3 kHz. This radio wave is received by the receiving circuit 15, and this signal is sent to the inverter 17. Thus, the inverter 17 continues to operate. Once in such a state, the inverter 17, the rectifying / smoothing circuit 21, the transmitting means 25, and the receiving means 15 continue to operate.

When the switch 23 is operated in such a state, the circuit is closed, the output of the rectifying / smoothing circuit 21 is applied to the motor 22, and the blade 26 rotates. In other words, the coffee beans can be ground cordlessly.

In the present embodiment, the load circuit 24 is a motor 22. However, the present invention is not limited to a motor using a motor, but may be one that emits sound, vibration, and light.

Next, a second embodiment of the first means of the present invention will be described with reference to FIG. In the present embodiment, an enamel pot 27 is placed on the magnetism generator 11 of the cordless device.

In this case, since the power consumption is larger than the voltage across the primary coil 14, the pan detecting means 16 outputs a "pan present" signal to the inverter 17. With this signal, the inverter 17 continues to supply a high-frequency current to the primary coil 14. For this reason, a high-frequency magnetic field is generated from the primary coil, and the pot 27 is induction-heated so that cooking can be performed.

When nothing is put on the magnetism generating unit 11, the inverter 17 temporarily stops after about 150 msec. However, in the present embodiment, a start signal is applied again from the pan detecting means 16 to the inverter 17 two seconds after the stop, and a high-frequency current is supplied to the primary coil. That is, it can be used even when the load section 12 or the pan 27 is placed later. If the pot 27 is placed when the activation signal is applied, the pot detecting means 16 outputs a signal indicating "pot present" to the inverter at that point, so that the heating is performed at least two seconds after the pot 27 is placed. Begins. In addition, even when the load unit 12 is placed, the pan detecting means 1 must be at least within 2 seconds.
6, a high-frequency current is supplied from the inverter 17 to the primary coil.
Then, the transmitting means 25 operates, and a signal is input from the receiving means 15 to the inverter 17 to start the operation.

If nothing remains on the magnetism generating unit 11, it stops after about 150 msec, and again after 2 seconds, the inverter is restarted by a signal from the pan detecting means 16, so that the inverter is restarted. The high-frequency current is supplied to the primary coil 14 intermittently. Also, if you place a small metal object such as a knife or fork on the magnetic field,
Again, no signal is received by the receiving means 15 and the output of the pan detecting means 16 is "no pan", so that the high-frequency current is intermittently supplied to the primary coil 14 described above. However, in this state, the heating power of the small metal object is small, so that even if the user touches it, there is no burn.

In this embodiment, the power supply for the transmitting means 25 and the load circuit 24 is supplied from one secondary coil 20. However, in the load circuit and the transmission circuit, the required voltage value and current value are respectively set. If different, a plurality of secondary coils may be provided and supplied separately.

Next, an embodiment of the second means of the present invention will be described with reference to FIG. The configuration of the magnetic generator 11 of this embodiment is substantially the same as that of FIG. The load unit 28 includes a transmitting unit 30, a heating unit 31 made of magnetic stainless steel, a control circuit 32, a secondary coil 33, a rectifying and smoothing circuit 34, a tapping button 35, a tapping port 36, and a thermistor 3.
7 is provided. The secondary coil 33 is magnetically coupled to the primary coil 14, and generates a voltage between both terminals when the primary coil 14 operates to generate a high-frequency magnetic field. The rectifying / smoothing circuit 34 converts this high-frequency voltage into direct current and supplies power to the transmitting means 30 and the control circuit 32. Particularly, in the present embodiment, a rectifying / smoothing circuit 34 having a built-in large-capacity storage device such as an electric double layer capacitor is used. Therefore, about 150 msec for the secondary coil 33
Even when a high-frequency magnetic field is applied for only a short time, the capacitor is charged during this period, and the supply of voltage to the transmission means 30 and the control means 32 can be continued for about seven seconds thereafter. The control circuit 32 is connected to the thermistor 37 and the thermistor 3
When the detected temperature of 7 is high and its resistance value reaches a predetermined value or less, a signal of 2 kHz is transmitted to the transmitting means 30.
While the temperature detected by the thermistor 37 is low and the resistance value is equal to or higher than a predetermined value, a signal of 1 kHz is transmitted to the transmitting means 30. The transmitting means 30 receives the pulse signal of 1 kHz or 2 kHz transmitted from the control circuit 32,
The carrier wave of 0 MHz is amplitude-modulated and output as a radio wave.

When the user presses the upper portion of the tapping button 35 downward, air is sent into the heat generating portion 31 to increase the internal pressure and the tapping water is supplied from the tapping hole 36.

The receiving means 29 receives and demodulates the amplitude-modulated radio wave of 300 MHz transmitted by the transmitting means 30, and if the output is 1 kHz, operates the inverter 17 continuously. When the demodulated frequency is 2 kHz, the inverter 1 is intermittently activated once every 5 seconds for 200 msec.
7 is operated.

The operation of this embodiment will be described below. The power cord 19 constituting the magnetism generator 11 is connected to an outlet by a user. In this state, the load unit 28 is placed on the top plate 13. At this moment, since the high frequency magnetism is not supplied to the secondary coil 33, the output of the rectifying / smoothing circuit 34 is zero. Therefore, no power is supplied to the transmitting means 30, and no radio waves are output from the transmitting means 30. However, as described in the first embodiment of the present invention, the pan detecting means 16 activates the inverter 17 to detect the presence or absence of the pan on the top plate 13, and responds to the presence or absence of the pan. Inverter 17
Output the signal. In the case of the present embodiment, since the diameter of the heat generating portion 31 constituting the load portion 12 is considerably large, the pan detecting means 16 normally determines that “there is a pan”. When the diameter of the heat generating portion 31 is small or when the heat generating portion 31 is placed at a position distant from the primary coil 14, the pan detecting means 16 determines "no pan". However, even if the pan detecting means 16 makes a judgment of "no pan", the pan-less signal is sent to the inverter 17 after about 150 msec, and consequently, regardless of the output of the pan detecting means 16, the inverter 17 The high-frequency current is supplied to the primary coil 14 continuously.

That is, the high-frequency magnetic field generated from the primary coil 14 is linked with the secondary coil 33 and
A high-frequency voltage is generated between the two terminals 3. This high-frequency voltage is applied to the rectifying and smoothing circuit 34 and is converted into a DC voltage. This DC voltage is applied to the transmitting means 30, and the transmitting means 30 starts operating. The transmitting means 30 outputs a radio wave obtained by amplitude-modulating a carrier of about 300 MHz with a pulse of 3 kHz.
This radio wave is received by the receiving means 29, and this signal is sent to the inverter 17. Thus, the inverter 17 continues to operate. Once in such a state, the inverter 17, the rectifying and smoothing circuit 34, the transmitting means 30, and the receiving means 29
Continues the operation. Therefore, the heating part 31 is induction-heated by receiving a high-frequency magnetic field from the primary coil 14, and
The water therein is heated.

When the temperature of the water in the heating section 31 rises and the resistance value of the thermistor 37 falls below a predetermined value, the control circuit 32
Sends a 2 kHz signal to the transmitting means 30. Receiving this signal, the receiving means 29 shifts to an operation of intermittently operating the inverter 17 once every 5 seconds for 200 msec because the demodulated signal is 2 kHz. Here, during the period in which the inverter 17 is stopped, since the high-frequency magnetic field is not supplied to the primary coil 14, the output of the secondary coil 33 is also zero, and the heating part 31 is not induction-heated.
In this embodiment, a large-capacity storage device is used for the rectifying and smoothing circuit 34 as described above. Therefore, power is supplied to the transmission means 30 and the control circuit 32 even during this suspension period, and the control circuit 32 and the transmission means 30 continue to operate. In this way, the high-frequency current is intermittently supplied to the primary coil 14, during which the large-capacity battery is charged, and the voltage can be maintained at a certain level or more. In addition, the induction heating power is also intermittently supplied to the heat generating unit 31, and the magnitude of the average power supplied at this time is required to maintain the water temperature in the heat generating unit 31 in this embodiment. It is designed to be less than the calorific value. Therefore, the water temperature in the heat generating portion 31 gradually decreases, and the resistance value of the thermistor 37 eventually exceeds a predetermined value, so that a 1 kHz signal is output from the control circuit 32 to the transmitting means 30 again. This signal is received by the receiving means 29, and the inverter 16 is again operated continuously, so that the heating section 31 is continuously heated. Hereinafter, such an operation is repeated to generate the heat generating portion 31.
The temperature of the water inside is kept almost constant.

The user can press a tapping button 35 as needed, and pour hot water from a tapping port 36 into a clay bottle, a cup, a teacup, a cup-type instant noodle, or the like.

As described above, the cordless device of this embodiment is
The power cord can be removed from the load. Therefore, there is no trouble in using the load portion, and there is no need to clean up the power cord after use.
In addition, since a power cord is not required, the load can be made simple in terms of design. Also, there is an effect that a heater is not required in the load section.

In particular, in this embodiment, since the power supply of the transmitting means 30 and the control circuit 32 is a voltage generated in the secondary coil 33, it is not necessary to use another power supply such as a dry battery on the load section 28 side. . Therefore, maintenance such as battery replacement is not required. Conventionally, a large and heavy transformer or an expensive switching power supply has been used as a low-voltage power supply for the transmitting means 30 and the control circuit 32. Since the power of the circuit 32 is supplied from the secondary coil 33, the configuration is simple and the weight, size and cost are excellent.

In this embodiment, the high-frequency voltage induced in the secondary coil 33 is rectified and the control circuit 32 and the transmitting means 3 are rectified.
Although a power source of 0 is obtained, a battery may be provided inside the load unit 28 to supply a part or all of the necessary power to the control circuit 32, the transmitting unit 30, and the like.

The load 2 is placed on the top plate 13.
In the case where an enamel pot or the like is placed instead of placing the pot 8, the operation is the same as that of the second embodiment of the first means of the present invention. That is, the operation is the same as that shown in FIG.
High-frequency current is continuously supplied to the primary coil 14, the pot is induction-heated, and cooking can be performed.

The operation when a small metal object is placed on the top plate 13 is exactly the same as in the above embodiment.

In each of the above embodiments, the transmitting means and the receiving means perform communication by radio waves. However, the present invention is not particularly limited to radio waves, and may transmit voice, light, mechanical power, or the like. You may. Further, the frequency and magnitude of the high-frequency current supplied to the primary coil may be changed in accordance with a signal from the receiving means, so that a high-frequency magnetic field more suitable for the operation of the load unit is supplied. be able to.

[0040]

As is clear from the above embodiments, according to the first means of the present invention, the magnetic generator comprises a magnetic generating section and a load section, and the magnetic generating section has a top for mounting the load section. A plate, a primary coil provided under the top plate for generating a high-frequency magnetic field, an inverter for driving the primary coil, a receiving unit, and a pan detecting unit for detecting the presence or absence of a pan, and the load unit includes: A secondary coil magnetically coupled with the primary coil, transmitting means, and a load circuit supplied with power from the secondary coil, wherein the inverter has the receiving means receiving a predetermined signal from the transmitting means. When using a device having various load circuits as a cordless device for supplying a high-frequency current to the primary coil when the pan detection means detects that a pan is present on the top plate. Power cord to those which are not required and also to realize a device that can act as an induction heating cooker using the enamel pot stainless pan.

According to the second means of the present invention, the magnetic generator comprises a magnetic generator and a load, wherein the magnetic generator comprises a top plate on which the load is mounted, and a high-frequency wave provided below the top plate. A primary coil that generates a magnetic field, an inverter that drives the primary coil, a receiving unit, and a pan detecting unit that detects the presence or absence of a pan, wherein the load unit receives a magnetic field of the transmitting unit and the primary coil A heating unit made of a metal to be induction-heated, wherein the inverter operates when the receiving means receives a predetermined signal from the transmitting means, and when the receiving means receives a signal from the pan detecting means; As a cordless device that supplies high-frequency current to the coil, functions such as boiling water can be realized cordlessly and without using a heater, and it can be used as an induction heating cooker using an enamel pan or stainless steel pan. It realizes the device capable Rukoto.

[Brief description of the drawings]

FIG. 1 is a sectional view of a cordless coffee grinder according to a first embodiment of the first means of the present invention.

FIG. 2 is a sectional view of an induction heating cooker according to the second embodiment.

FIG. 3 is a cross-sectional view of a cordless water heater that is an embodiment of the second means of the present invention.

FIG. 4 is a cross-sectional view of a coffee mill according to the related art.

FIG. 5 is a cross-sectional view of a jar in the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Magnetic generation part 12 Load part 13 Top plate 14 Primary coil 17 Inverter 15 Receiving means 16 Pan detecting means 20 Secondary coil 25 Transmitting means 24 Load circuit

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Hideyuki Konan 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. (56) References JP-A-52-86544 (JP, A) JP-A-59- 35385 (JP, A) Japanese Utility Model Hei 3-49041 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A47J 43/04 A47J 27/00-27/21 A47J 42/00 H05B 6/06

Claims (2)

(57) [Claims] 1. A magnetic generator comprising a magnetic generator and a load, wherein the magnetic generator comprises a top plate for mounting the load, a primary coil provided below the top plate for generating a high-frequency magnetic field, An inverter that drives the coil, a receiving unit, and a pan detecting unit that detects the presence or absence of the pan, the load unit includes a secondary coil that is magnetically coupled to the primary coil, a transmitting unit, and the secondary coil. When the receiving means has received a predetermined signal from the transmitting means and the pot detecting means has detected that there is a pot on the top plate, the inverter has a load circuit that is supplied with power, A cordless device for supplying a high-frequency current to the primary coil. 2. A magnetic power generator comprising a magnetic generator and a load, wherein the magnetic generator comprises a top plate on which the load is mounted, a primary coil provided below the top plate for generating a high-frequency magnetic field, An inverter that drives a coil, a receiving unit, and a pan detecting unit that detects the presence or absence of a pan, wherein the load unit includes a transmitting unit and a metal heating unit that is induction-heated by receiving a magnetic field of the primary coil. A cordless device that operates when the receiving unit receives a predetermined signal from the transmitting unit and when the receiving unit receives a signal from the pan detecting unit, and supplies a high-frequency current to the primary coil.