JP2022159624A - Electric device - Google Patents

Abstract

To obtain an electric device that improves usability of a container to be heated or cooled by a temperature regulator to which power is supplied from a power receiving coil for receiving power in a noncontact manner.SOLUTION: An electric device according to the present disclosure comprises: a plate case comprising a placement part; a power transmitting coil housed in the plate case, and arranged below the placement part; an inverter for supplying a high-frequency current to the power transmitting coil; a power receiver case placed on the placement part; a power receiving coil housed in the power receiver case, and for receiving power from the power transmitting coil in a noncontact manner; a temperature regulator housed in the power receiver case, and to which power is supplied from the power receiving coil; and a container detachably attached to the power receiver case, and to be heated or cooled by the temperature regulator.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present disclosure relates to an electric device including a temperature controller that receives power from a power receiving coil that receives power in a non-contact manner.

Conventionally, there has been proposed a non-contact power feeding device that supplies power in a non-contact manner from a power transmission coil arranged on a table to a power reception coil arranged on an electric cooking vessel (see, for example, Patent Literature 1). In the contactless power supply device described in Patent Document 1, power is supplied from a power receiving coil to a load such as a DC resistance or an AC resistance provided in an electric cooking vessel.

JP 2017-158275 A

In the technique described in Patent Literature 1, an electric cooking vessel incorporates a power receiving coil and a load, and the amount of power supplied to the load is predetermined. For example, when the technology described in Patent Document 1 is applied to an electric cooking vessel for heating or cooling, the amount of power supplied to the load is determined, so the output of the load during heating or cooling is also determined in advance. Since the output of the load, that is, the temperature for heating or cooling the container is fixed in advance, the situations in which the electric cooking container can be used are limited, and there is the problem that the electric cooking container is inconvenient to use.

Against the background of the problems described above, the present disclosure provides an electrical device that improves usability of a container that is heated or cooled by a temperature controller that receives power from a power receiving coil that receives power in a non-contact manner.

An electrical device according to the present disclosure includes a plate housing including a mounting portion, a power transmission coil housed in the plate housing and arranged below the mounting portion, and supplying a high-frequency current to the power transmission coil. an inverter, a power receiver housing mounted on the mounting portion, a power receiving coil housed in the power receiver housing and receiving power from the power transmitting coil in a contactless manner, and housed in the power receiver housing, A temperature controller to which power is supplied from the power receiving coil, and a container that is detachably attached to the power receiver housing and heated or cooled by the temperature controller.

According to the present disclosure, the container is detachable from the power receiver housing that accommodates the power receiving coil that wirelessly receives power from the power transmitting coil and the temperature controller that receives power from the power receiving coil. Therefore, by changing the combination of the power receiver housing and the container, the user can heat or cool the container to the desired temperature, thereby improving usability for the user.

1A and 1B are diagrams illustrating a structure of an electric device 100 according to Embodiment 1; FIG. 4A and 4B are diagrams for explaining the structure of the plate portion 10 according to the first embodiment; FIG. 2A and 2B are diagrams illustrating a power receiver 20 and a container 30 according to Embodiment 1. FIG. 4A and 4B are diagrams illustrating an example of a combination of the power receiver 20 and the container 30 according to the first embodiment; FIG. 2A and 2B are diagrams illustrating the structure of the power receiver 20 according to the first embodiment; FIG. FIG. 10 is a diagram illustrating a circuit configuration of a plate section 10 according to Embodiment 2; FIG. 10 is a diagram for explaining resonance characteristics of a plate portion 10 according to Embodiment 2; 9 is a control flowchart of the plate unit 10 according to Embodiment 2. FIG. FIG. 10 is a diagram illustrating the structure of a power receiver 20 according to Embodiment 3; FIG. 10 is a diagram illustrating a circuit configuration of a plate section 10 according to Embodiment 3; 10 is a control flowchart of the plate unit 10 according to Embodiment 3. FIG. 10 is a flowchart for explaining the flow of bus voltage variable control according to Embodiment 3; FIG. 11 is a schematic cross-sectional view of main parts of a plate portion 10, a power receiver 20, and a container 30 according to Embodiment 4; FIG. 12 is a schematic cross-sectional view of main parts of the plate part 10, the power receiver 20, and the container 30 according to another example of the fourth embodiment; FIG. 12 is a schematic cross-sectional view of main parts of the plate part 10, the power receiver 20, and the container 30 according to another example of the fourth embodiment; FIG. 12 is a schematic cross-sectional view of main parts of the plate part 10, the power receiver 20, and the container 30 according to another example of the fourth embodiment;

Hereinafter, embodiments of an electrical device according to the present disclosure will be described with reference to the drawings. The present disclosure is not limited to the following embodiments, and various modifications can be made without departing from the gist of the present disclosure. In addition, the present disclosure includes all combinations of configurations that can be combined among the configurations shown in the following embodiments. Also, the electrical equipment shown in the drawings is an example of equipment to which the electrical equipment of the present disclosure is applied, and the applicable equipment of the disclosure is not limited by the electrical equipment shown in the drawings. Also, in the following description, terms representing directions (eg, "right", "left", "front", "back", etc.) are used as appropriate for ease of understanding, but these are for explanation purposes only. and does not limit the present disclosure. Also, in each figure, the same reference numerals denote the same or corresponding parts, which are common throughout the specification. In each drawing, the relative dimensional relationship, shape, etc. of each component may differ from the actual one.

Embodiment 1.
(Configuration of electrical equipment 100)
FIG. 1 is a diagram illustrating the structure of an electrical device 100 according to Embodiment 1. FIG. The electric device 100 includes a plate portion 10 having a power transmitting coil 12 housed in a plate housing 11, a power receiver 20 having a power receiving coil 22 and a temperature controller 23 housed in a power receiver housing 21, a container 30. In the electric device 100 , the power receiving coil 22 wirelessly receives power from the power transmitting coil 12 , and power is supplied from the power receiving coil 22 to the temperature controller 23 . That is, contactless power supply is performed from the plate portion 10 to the power receiver 20 . A container 30 is placed on the power receiver 20 , and the container 30 is heated or cooled by the temperature controller 23 . Thereby, the food in the container 30 is heated or cooled, and the user can eat the heated or cooled food. In the electric device 100 of the present embodiment, the power receiver 20 and the container 30 are detachable, and by changing the combination of the power receiver 20 and the container 30, food heated or cooled to a desired state can be obtained. can.

The plate section 10 includes a plate housing 11 , a power transmission coil 12 housed in the plate housing 11 , a power plug 13 , a power button 14 , a control section 17 and an inverter 18 . The plate housing 11 is, for example, a tray-like or desk-like housing. The plate housing 11 may be of a size that allows the user to carry it. Further, the plate housing 11 may be provided with a handle that a user holds when carrying.

The power transmission coil 12 is a coil formed by winding a conductive wire such as a copper wire or an aluminum wire, for example, and generates a high frequency magnetic field by being supplied with a high frequency current.

The inverter 18 supplies high-frequency current to the power transmission coil 12 .

The control unit 17 controls the high-frequency current supplied to the power transmission coil 12 by controlling the inverter 18 . The control unit 17 is configured by hardware such as a circuit device that realizes its functions. Alternatively, the control unit 17 has a memory for storing programs and a CPU (Central Processing Unit), and the functions of the control unit 17 are realized by the CPU executing the programs.

The power button 14 receives an operation for switching the power of the plate section 10 between on and off. The power button 14 can be realized by a push button, sheet switch, capacitive switch, or the like. When the power button 14 is turned on or turned off, a signal corresponding to the operation is input to the controller 17 .

2A and 2B are diagrams illustrating the structure of the plate portion 10 according to the first embodiment. FIG. FIG. 2 shows a state in which the plate portion 10 is viewed from above. The planar shape of the plate portion 10 of the present embodiment is a rectangle with rounded corners, and can be used as a serving plate for one person. A user can put the plate portion 10 on which the power receiver 20 and the container 30 shown in FIG.

The plate section 10 is provided with a first mounting section 161 , a second mounting section 162 , a third mounting section 163 , a fourth mounting section 164 and a fifth mounting section 165 . Under the first mounting portion 161, the second mounting portion 162, the third mounting portion 163, the fourth mounting portion 164, and the fifth mounting portion 165, the first power transmitting coil 121 and the second power transmitting coil 121, respectively. A coil 122, a third power transmission coil 123, a fourth power transmission coil 124, and a fifth power transmission coil 125 are provided. In this specification, when there is no need to distinguish between the first mounting section 161, the second mounting section 162, the third mounting section 163, the fourth mounting section 164, and the fifth mounting section 165, It is generically called the mounting section 16 . Similarly, the first power transmission coil 121, the second power transmission coil 122, the third power transmission coil 123, the fourth power transmission coil 124, and the fifth power transmission coil 125 are collectively referred to as the power transmission coil 12 when they do not need to be distinguished.

The same number of mounting portions 16 and power transmission coils 12 are provided. The mounting portion 16 indicates the position where the power receiver 20 and the container 30 shown in FIG. 1 should be mounted in the plate housing 11 . The plate housing 11 may be provided with a mark indicating the placement portion 16 so that the user can easily recognize the positions where the power receiver 20 and the container 30 should be placed. This mark can be realized by printing, a seal, or a projection or recess provided on the surface of the plate housing 11, or the like. Although the number of placement units 16 is five in the example of FIG. 2, the number may be one or more.

In this embodiment, a circular first placement portion 161 and a second placement portion 162 are provided. The diameters of the first mounting portion 161 and the second mounting portion 162 are different, so that the power receiver 20 and the container 30 having different diameters can be mounted on each of them. Further, in the present embodiment, a rectangular third mounting portion 163, a fourth mounting portion 164, and a fifth rectangular mounting portion 165 are also provided. Although the planar shape and size of the mounting portion 16 are not particularly limited, if the plate housing 11 is provided with the mounting portions 16 having a plurality of types of shapes and sizes, the user can select the desired size of the container 30 . Easy to use. In addition, the size and shape of the plurality of mounting portions 16 may all be the same. By doing so, the user can place any power receiver 20 and container 30 on any placement portion 16 without being conscious of the combination of the power receiver 20 and container 30 with the placement portion 16 . can be used

3A and 3B are diagrams illustrating the power receiver 20 and the container 30 according to the first embodiment. FIG. 3 shows the shapes of the power receiver 20 and the container 30 when viewed from the side. FIG. 3 illustrates three types of containers 30a, 30b and 30c having different diameters, heights and shapes. Container 30 a , container 30 b and container 30 c are collectively referred to as container 30 . Moreover, in FIG. 3, seven types of power receiver housings 21 having different diameters and heights are shown. An electric appliance 20g is illustrated.

The container 30a is a container for main dishes such as meat dishes, fish dishes, stews, or curry, and has a larger diameter than others. The container 30b is, for example, a container for soup or beverage such as soup, miso soup or tea, and has a smaller diameter and is taller than others. The container 30c is, for example, a container for side dishes such as salad, sashimi, simmered dishes, or aemono, and has a smaller diameter and height than others. Any of these differently shaped containers 30 can be used by the user.

The container 30 is heated or cooled by heat transfer from a temperature controller 23 (see FIG. 5) provided in the power receiver 20 as described later. The container 30 is preferably made of a material having heat resistance and high thermal conductivity, such as aluminum, stainless steel, or synthetic resin.

The power receivers 20a to 20c are used for the container 30a, and the diameters of the power receiver housings 21 of the power receivers 20a to 20c are approximately the same as the diameter of the bottom of the container 30a. The power receiver housings 21 of the power receivers 20a to 20c have different heights, and the distance between the built-in power receiving coil 22 and the bottom of the power receiver housing 21 is also different. The power receiving coil 22 built into the power receiver 20a has a larger diameter than the power receiving coils 22 of the power receivers 20b and 20c, and the amount of electricity is large when the same power transmitting coil 12 (see FIG. 1) is used. The power receiving coil 22 of the power receiver 20b and the power receiving coil 22 of the power receiver 20c have the same diameter. different distances from The power receiving coil 22 of the power receiver 20c is located at a height H from the bottom of the power receiver housing 21, and the distance from the power transmitting coil 12 (see FIG. 1) is increased. Therefore, the amount of energization of the power receiving coil 22 of the power receiver 20c is smaller than the amount of energization of the power receiving coil 22 of the power receiver 20b.

The power receiver 20d and the power receiver 20e are used in the container 30b, and the diameters of the power receiver housings 21 of the power receivers 20d and 20e are approximately the same as the diameter of the bottom of the container 30b. The power receiver 20d and the power receiver 20e have different diameters of the built-in power receiving coils 22, and the diameter of the power receiving coil 22 of the power receiver 20d is larger than the diameter of the power receiving coil 22 of the power receiver 20e. Therefore, when the same power transmission coil 12 (see FIG. 1) is used, the amount of power supplied to the power receiving coil 22 of the power receiver 20d is greater than the power amount of the power receiving coil 22 of the power receiver 20e.

The power receiver 20f and the power receiver 20g are used for the container 30c, and the diameters of the power receiver housings 21 of the power receivers 20f and 20g are approximately the same as the diameter of the bottom of the container 30c. The power receiver 20f and the power receiver 20g have different diameters of the built-in power receiving coils 22, and the diameter of the power receiving coil 22 of the power receiver 20f is larger than the diameter of the power receiving coil 22 of the power receiver 20g. Therefore, when the same power transmission coil 12 (see FIG. 1) is used, the amount of power supplied to the power receiving coil 22 of the power receiver 20f is greater than the power amount of the power receiving coil 22 of the power receiver 20g.

FIG. 4 is a diagram illustrating an example of combination of the power receiver 20 and the container 30 according to the first embodiment. FIGS. 4A and 4B show examples in which the container 30a is combined with the power receiver 20a or the power receiver 20c, respectively. 4A and the combination of the container 30a and the power receiver 20c shown in FIG. (see FIG. 1) are the same, the former is larger. Therefore, even when the same container 30a is used, the power receivers 20a to 20c combined with the same container 30a can be changed to change the amount of power supplied to the power receiving coil 22, that is, the amount of power supplied from the power receiving coil 22 to the temperature controller 23 (see FIG. 5). can be different. By varying the amount of power supplied to the temperature controller 23 (see FIG. 5), the output of the temperature controller 23 during heating or cooling can be varied.

FIGS. 4C and 4D show examples in which the container 30c is combined with the power receiver 20f or the power receiver 20g, respectively. Comparing the energization amount of the power receiving coil 22 between the combination of the container 30c and the power receiver 20f shown in FIG. (see FIG. 1) are the same, the former is larger. Therefore, even if the same container 30c is used, depending on whether it is combined with the power receiver 20f or the power receiver 20g, the amount of energization of the power receiving coil 22, that is, the power supply from the power receiving coil 22 to the temperature controller 23 (see FIG. 5). Amounts can vary. The same can be said for the combination of the container 30b and the power receiver 20d or the power receiver 20e. By varying the amount of power supplied to the temperature controller 23 (see FIG. 5), the output of the temperature controller 23 during heating or cooling can be varied.

FIG. 5 is a diagram illustrating the structure of power receiver 20 according to the first embodiment. The power receiver 20 includes a power receiver coil 22 , a temperature controller 23 and a power supply circuit 24 housed in a power receiver housing 21 , and a display section 25 .

Power receiving coil 22 is a coil formed by winding a conductive wire such as a copper wire or an aluminum wire, for example. The power receiving coil 22 is arranged so as to face the power transmitting coil 12 (see FIG. 1). When a high-frequency current is supplied to the power transmission coil 12 , a magnetic flux is formed around the power transmission coil 12 , and the power reception coil 22 is interlinked with this magnetic flux, thereby generating an induced electromotive force in the power reception coil 22 . The power generated in the power receiving coil 22 is input to the power feeding circuit 24 .

The temperature controller 23 is a device that operates with electric power obtained from the power receiving coil 22 through the power supply circuit 24 and heats or cools the container 30 (see FIG. 1 and the like). The temperature controller 23 is, for example, an electric resistance heater or a Peltier element.

If the temperature adjuster 23 is an electrical resistance heater, the temperature adjuster 23 is placed on top of the power receiver housing 21 . The temperature adjuster 23 is in contact with or faces the upper surface of the power receiver housing 21 with a gap therebetween, and transfers the generated heat to the container 30 (see FIG. 1, etc.) via the power receiver housing 21 . In this case, at least the upper surface of the power receiver housing 21 is preferably made of a material having heat resistance and high thermal conductivity, such as aluminum, stainless steel, or synthetic resin.

When the temperature adjuster 23 is a Peltier element, the temperature adjuster 23 is arranged in the upper part of the power receiver housing 21 so that the heat absorbing surface of the Peltier element faces upward and the heat generating surface faces downward. The heat absorption surface of the Peltier element, which is the temperature controller 23, faces the upper surface of the power receiver housing 21 with a contact or gap. etc.) to cool the container 30 .

The power supply circuit 24 is a circuit that supplies the power generated in the power receiving coil 22 to the temperature controller 23 . The feeding circuit 24 includes a rectifying circuit and converts the high frequency voltage into a DC voltage. The power supply circuit 24 further includes an output power generation circuit, which steps up or down the DC voltage supplied from the rectifier circuit to supply the temperature controller 23 with a voltage suitable for the temperature controller 23 .

The display unit 25 displays information regarding the output temperature of the temperature controller 23 . The information about the output temperature of the temperature controller 23 may be, for example, whether the temperature controller 23 is used for heating or for cooling, or may be 10° C., 40° C., 50° C., or the like. It may be the temperature. Also, words such as “hot”, “warm”, and “cold” may be displayed on the display unit 25 . The display unit 25 is an electrical display device that operates by receiving power from the power supply circuit 24, and may employ, for example, an LED (Light Emitting Diode). The display unit 25 may display the temperature of the temperature controller 23 with a 7-segment LED. Alternatively, for example, if the temperature controller 23 is for heating, the temperature controller 23 lights in orange, and if the temperature controller 23 is for cooling, the temperature controller 23 lights in blue. Colors can be different. There is only one temperature controller 23 housed in the power receiver casing 21, and the purpose and temperature of the temperature controller 23 are determined in advance. should be displayed.

Since the display unit 25 receives power from the power receiving coil 22 via the power supply circuit 24, display on the display unit 25 also starts when the power receiving coil 22 starts to generate power. In addition to the display unit 25 , the information on the output temperature of the temperature controller 23 may be displayed on the power receiver housing 21 using characters or a diagram.

The operation of the electric device 100 configured as described above will be described with reference to FIGS. 1 and 2. FIG. The power receiver 20 and the container 30 are combined and mounted on the mounting portion 16 of the plate portion 10 . The container 30 contains food. The plate section 10 on which the power receiver 20 and the container 30 are mounted is placed, for example, on the dining table of the user. When the power plug 13 of the plate section 10 is inserted into an outlet and the power button 14 is turned on, the control section 17 operates the inverter 18 . When the inverter 18 operates, a high frequency current is supplied to the power transmission coil 12 and a high frequency magnetic field is generated around the power transmission coil 12 . This high-frequency magnetic field interlinks with the power receiving coil 22 of the power receiver 20 to generate an induced electromotive force in the power receiving coil 22 , and the generated power is supplied to the temperature controller 23 .

If the temperature controller 23 is for heating, the container 30 is warmed by the temperature controller 23, and the food in the container 30 is also warmed. Food such as rice, grilled food, boiled food, hot pot such as boiled tofu, or soup put in the container 30 is eaten by the user in a warm state. Moreover, if the temperature controller 23 is for cooling, the container 30 is cooled by the temperature controller 23, and the food in the container 30 is also cooled. Food such as sashimi, salad, salad, cold soup, etc. placed in the container 30 is eaten by the user in a cold state.

When the power button 14 is turned off by the user, the controller 17 stops the inverter 18 . As a result, no high-frequency magnetic field is generated from the power transmitting coil 12 , and no power is generated in the power receiving coil 22 . When power supply from power receiving coil 22 is stopped, temperature controller 23 stops heating or cooling operation.

As described above, electric device 100 of the present embodiment includes plate portion 10 , power receiver 20 , and container 30 . The plate unit 10 includes a plate housing 11 having a mounting portion 16, a power transmission coil 12 housed in the plate housing 11 and arranged below the mounting portion 16, and supplying high-frequency current to the power transmission coil 12. and an inverter 18 . The power receiver 20 includes a power receiver housing 21 placed on the mounting portion 16 , a power receiving coil 22 housed in the power receiver housing 21 and receiving power from the power transmitting coil 12 in a contactless manner, and the power receiver housing 21 . and a temperature controller 23 that is housed in the power receiving coil 22 and receives power from the power receiving coil 22 . Further, the container 30 is detachably attached to the power receiver housing 21 and heated or cooled by the temperature adjuster 23 . Thus, in the electric device 100, the container 30 can be detachably attached to the power receiver housing 21 that houses the power receiving coil 22 that wirelessly receives power from the power transmitting coil 12 and the temperature controller 23 that receives power from the power receiving coil 22. is. Therefore, by changing the combination of the power receiver 20 and the container 30, the user can heat or cool the container 30 according to his/her preference to a desired temperature, thereby improving usability for the user.

In addition, the electric device 100 of the present embodiment includes a plurality of types of power receivers 20 that can be used for one container 30 and that have different amounts of power supplied to the temperature regulators 23 . Therefore, by changing the power receiver 20 to be combined with the container 30, the container 30 can be heated or cooled to a temperature according to the user's preference.

For example, for a plurality of power receivers 20 equipped with temperature controllers 23 for the same heating application, either or both of the diameter of the power receiving coil 22 and the distance between the power receiving coil 22 and the mounting portion 16 are varied to change the amount of energization. make different. Then, the user himself/herself selects the power receiver 20 with which the desired amount of heating can be obtained, and attaches it to the container 30 . By doing so, the user can eat hot rice in the container 30 by using the power receiver 20 capable of heating to a high temperature, and eat slightly warm rice in the container 30 by using the power receiver 20 capable of heating to a low temperature. can also In addition, when the electrical equipment 100 is used for meals provided in serviced housing for the elderly, hospitals, etc., the person in charge of providing meals combines the power receiver 20 and the container 30, and each user who takes the meal We can provide suitable meals for

Also, by using a heater as the temperature controller 23 of the present embodiment, the food in the container 30 can be heated. Thereby, a user can be provided with hot food. Also, by using a Peltier device as the temperature adjuster 23 of the present embodiment, the food in the container 30 can be cooled. Thereby, cold food can be provided to the user.

Further, the power receiver housing 21 of the present embodiment includes a display section 25 that displays information regarding the output temperature of the temperature controller 23 . The display unit 25 displays the application for heating or cooling of the temperature adjuster 23 or the output temperature of the temperature adjuster 23, so that the function of the power receiver 20 can be clearly communicated to the user. Furthermore, since the display unit 25 of the present embodiment is powered by the power receiving coil 22 and operates, presence/absence of operation with the temperature controller 23 and presence/absence of display on the display unit 25 correspond one-to-one. That is, when the temperature controller 23 is operating, the display unit 25 also displays, so that the user can easily grasp that the container 30 is being heated or cooled by the power receiver 20 and the temperature information.

Embodiment 2.
In this embodiment, the circuit configuration of the plate portion 10 in a mode in which the plate portion 10 is provided with a plurality of power transmission coils 12 will be described. This embodiment mode can be combined with the first embodiment mode. In this embodiment, differences from the first embodiment will be mainly described. In this embodiment, an example in which the first power transmission coil 121, the second power transmission coil 122, and the third power transmission coil 123 are provided in the plate portion 10 will be described.

FIG. 6 is a diagram illustrating the circuit configuration of the plate section 10 according to the second embodiment. FIG. 6 also shows a commercial power source 40 . The plate section 10 includes a rectifying circuit 41 , a smoothing reactor 42 , a smoothing capacitor 43 , a current sensor 44 , a control section 17 , an inverter 18 having switching elements, and a notification means 19 .

A pair of input terminals of the rectifier circuit 41 are connected to the commercial power supply 40 . The rectifier circuit 41 converts commercial AC power supplied from the commercial power supply 40 into DC voltage. The smoothing reactor 42 is connected to the high-potential-side output terminal of the rectifier circuit 41 and suppresses pulsating current of the DC voltage output from the rectifier circuit 41 . The smoothing capacitor 43 is connected between the output end of the smoothing reactor 42 and the output end of the rectifier circuit 41 on the low potential side, and suppresses high-frequency ripples in the current. In the following description, the circuit composed of the smoothing reactor 42 and the smoothing capacitor 43 may be referred to as a filter circuit.

The inverter 18 is connected to the output side of the rectifier circuit 41 and receives the DC voltage supplied through the filter circuit. The inverter 18 has two switching elements connected in series, and the switching elements are alternately switched between an on state and an off state to output a high-frequency current to the power transmission coil 12 . The frequency at which the two switching elements are switched between the ON state and the OFF state, that is, the frequency of the high-frequency current output from the inverter 18 is called the drive frequency. The inverter 18 starts a switching operation when a signal instructing the start of oscillation is input from the control unit 17 .

The current sensor 44 is connected between the rectifier circuit 41 and the inverter 18, detects current flowing through the inverter 18, and outputs a signal to the control unit 17 when the detected current exceeds a first threshold. The current sensor 44 functions as inverter protection means for protecting the inverter 18 from destruction, as will be described later.

A snubber capacitor 45 is provided on the output side of the inverter 18 . Snubber capacitor 45 suppresses switching loss that occurs when the switching element of inverter 18 is turned on from an off state.

The inverter 18 includes a resonance circuit consisting of the first power transmission coil 121 and the first resonance capacitor 461 , a resonance circuit consisting of the second power transmission coil 122 and the second resonance capacitor 462 , a third power transmission coil 123 and the third resonance capacitor 463 . are connected in parallel. The first power transmission coil 121 and the first resonance capacitor 461 are connected in series, the second power transmission coil 122 and the second resonance capacitor 462 are connected in series, and the third power transmission coil 123 and the third resonance capacitor 463 are connected in series. It is connected to the. Thus, in this embodiment, a plurality of resonant circuits each having a power transmission coil 12 are connected in parallel to the output end of one inverter 18 .

The notification means 19 is, for example, a speaker that outputs sound, a display that displays characters or figures, or a lamp such as an LED. Both an audio output device such as a speaker and a display device such as a display may be provided.

FIG. 7 is a diagram illustrating resonance characteristics of the plate portion 10 according to the second embodiment. The horizontal axis of FIG. 7 indicates the driving frequency of the inverter 18, and the vertical axis of FIG. As shown in FIG. 7, when the drive frequency of the inverter 18 is changed, the output power also changes, and the drive frequency at which the output power is maximized is referred to as resonance frequency f0. A region higher than the resonance frequency f0 is called a lagging region, and a region lower than the resonance frequency f0 is called a leading region. When the inverter 18 is operated in the phase-advancing region, the loss of the switching elements increases, and the switching elements may be destroyed. Therefore, in the present embodiment, the drive frequency of inverter 18 is set to drive frequency f1, which is a specific value within the range of the lagging region. The drive frequency f1 of the inverter 18 is controlled to be a fixed value, and this drive frequency f1 is, for example, 25 kHz.

In this embodiment, a plurality of resonant circuits are connected to one inverter 18 . Therefore, a high-frequency current with the same drive frequency is supplied to the plurality of power transmission coils 12 . Each of the multiple power transmission coils 12 is magnetically coupled to the power receiving coil 22 of the power receiver 20 , and there are multiple power receivers 20 that can be used for the plate section 10 . Therefore, the power receiving coil 22 of each power receiver 20 is designed to operate in the lagging region when the inverter 18 is driven at the driving frequency f1.

Here, the resonance frequency f0 of the resonance circuit is represented by f0=1/2π√(L value×C value). The L value is the self-inductance value of the coil of the resonant circuit and the C value is the capacitance value of the capacitor. In this embodiment, since a single inverter 18 supplies a high-frequency current to a plurality of resonance circuits, it is desirable to equalize the resonance frequencies f0 of the plurality of resonance circuits. Therefore, the L values of the first power transmission coil 121 to the third power transmission coil 123 and the values of the first resonance capacitor 461 to the third resonance capacitor 463 are adjusted so that the [L value × C value] of each resonance circuit is equal. Set the C value. The L values of the first power transmission coil 121 to the third power transmission coil 123 may all be the same or may be different. , the corresponding C value is set.

As described above, if the inverter 18 operates in the phase-leading region of FIG. 7, the switching elements of the inverter 18 may be destroyed. A power receiver 20 is placed on the mounting portion 16 , and the power transmitting coil 12 and the power receiving coil 22 are designed to operate in the lagging region as described above. container may be unintentionally placed by the user. The control of the present embodiment that can protect the inverter 18 even in such a case will be described.

FIG. 8 is a control flowchart of the plate section 10 according to the second embodiment. When the power button (see FIG. 1) is turned on (step S1), the control unit 17 outputs a signal instructing the inverter 18 to operate for oscillation, and the inverter 18 starts operating (step S2). The inverter 18 starts a switching operation at the drive frequency f1, and high-frequency current is supplied from the inverter 18 to the first power transmission coil 121 to the third power transmission coil 123 .

The current sensor 44 starts detecting the inverter current flowing through the inverter 18 (step S3). Then, it is determined whether or not the detected inverter current exceeds the first threshold (step S4). Here, since a surge current flows through the switching element of the inverter 18 when the operation in the phase advance region is continued, the first threshold is a value for determining that a surge current has flowed. When the inverter current exceeds the first threshold (step S4: YES), a signal is input from the current sensor 44 to the control unit 17, a stop signal is input from the control unit 17 to the inverter 18, and the inverter 18 stops operating ( step S5). At this time, the notification means 19 may notify that the inverter 18 has stopped (step S5). When the notification means 19 is a lamp, the user may be notified of the operation stop by blinking. In the case where the notification means 19 is a speaker, it may be output by voice that the operation has been stopped because an unusable container has been placed. After step S5, the process ends.

For example, when a cooking vessel other than the power receiver 20, such as a pot or a frying pan, is placed on the mounting portion 16, magnetic coupling occurs between the power transmission coil 12 and the cooking vessel, and the power transmitting coil 12 can operate in the fast region. For example, when the drive frequency f1 is 25 kHz, when a pan or container made of a non-magnetic material having a resonance frequency of 28 kHz is placed on the placement unit 16, it will operate in the fast region. Become. Even in such a case, the operation of inverter 18 is stopped based on the detection result of current sensor 44, so that the switching elements of inverter 18 are prevented from being destroyed.

If the inverter current does not exceed the first threshold (step S4: NO), the inverter 18 continues to operate at the fixed frequency, that is, the driving frequency f1 (step S6). By operating the inverter 18, a high-frequency current is supplied to the power transmission coil 12, and non-contact power is supplied from the power transmission coil 12 to the power reception coil 22 by an electromagnetic induction method. Then, as shown in the first embodiment, power is supplied from the power receiving coil 22 to the temperature adjuster 23 , and the container 30 is heated or cooled by the temperature adjuster 23 .

Then, when the power button 14 is turned off (step S7: YES), the drive of the inverter 18 is terminated, and the process is terminated. Then, the supply of high-frequency current to all of the first power transmission coil 121 to the third power transmission coil 123 is stopped, and the contactless power supply to the power reception coil 22 is also stopped. Note that when any of the power receivers 20 is removed while the power receivers 20 are placed on all of the first power transmission coil 121 to the third power transmission coil 123, the removed power receiver 20 is removed. Power supply to the electric appliance 20 is not performed, but power supply to the other power receivers 20 is continued. Then, when the power receiver 20 is placed again on the placement portion 16 where the removed power receiver 20 was placed, contactless power supply to the power receiver 20 is resumed. If the power button 14 has not been turned off (step S7: NO), the process returns to step S4.

As described above, the plate portion 10 of the present embodiment is provided with a plurality of power transmission coils 12 (the first power transmission coil 121, the second power transmission coil 122, and the third power transmission coil 123). The same number of first resonance capacitors 461 , second resonance capacitors 462 and third resonance capacitors 463 as the plurality of power transmission coils 12 are provided. A plurality of resonance circuits each configured by connecting one power transmission coil 12 and one resonance capacitor in series are provided, and the plurality of resonance circuits are connected in parallel to the inverter 18 . Therefore, by driving the inverter 18 at the drive frequency f1, it is possible to simultaneously supply the high-frequency current to the plurality of power transmission coils 12 . Since the inverter 18 is not provided for each of the plurality of power transmission coils 12, the plate section 10 can be realized with an inexpensive circuit configuration, and the plate section 10 can be made lighter and thinner because there is only one inverter 18. .

Further, in the present embodiment, since the inverter 18 is driven at the fixed drive frequency f1, the control load of the control section 17 that controls the drive frequency of the inverter 18 is reduced.

Further, the plate unit 10 of the present embodiment includes a current sensor 44 that detects the inverter current flowing through the inverter 18 and outputs a signal to the control unit 17 when the detected inverter current exceeds the first threshold value. Then, upon receiving the signal from the current sensor 44 , the control section 17 stops the inverter 18 . By setting the value of the surge current of the inverter 18 as the first threshold value, even when a container other than the power receiver 20 is placed on the placing portion 16 and operates in the advanced phase region, the breakage of the inverter 18 is avoided. be able to. It is conceivable to provide a known dedicated load detection circuit in order to detect that a cooking container other than the power receiver 20, such as a pot or a frying pan, is placed on the placing portion 16. If a circuit is provided, the entire circuit becomes large and expensive. However, according to the present embodiment, it is possible to suppress overcurrent from flowing through inverter 18 without providing a dedicated load detection circuit.

Further, there is provided a notification means for notifying that the inverter 18 has stopped when the detection of the current sensor 44 exceeds the first threshold value. Therefore, if the user accidentally places a container other than the power receiver 20 and the container 30 on the placing portion 16, the fact can be notified to the user.

Note that the current sensor 44 that detects the current flowing through the inverter 18 may be provided in the plate portion 10 in which only one power transmission coil 12 is provided. Then, when it is detected that the inverter current exceeds the first threshold value, the inverter 18 is stopped by the controller 17 . Even in a mode in which one power transmission coil 12 is provided, the inverter 18 is protected by controlling the inverter 18 based on the detection result of the current sensor 44 .

Embodiment 3.
In this embodiment, an example of controlling the plate section 10 based on the temperature of the container 30 detected by the power receiver 20 will be described. In this embodiment, differences from the first embodiment will be mainly described.

FIG. 9 is a diagram illustrating the structure of power receiver 20 according to the third embodiment. The power receiver 20 of the present embodiment differs from the structure shown in FIG. 5 in that it includes a temperature sensor 26 and a power receiver control section 27 . 9 omits illustration of the display unit 25 shown in FIG. 5, the display unit 25 may or may not be provided.

A temperature sensor 26 detects the temperature of the container 30 . The temperature sensor 26 may be a contact temperature sensor or a non-contact temperature sensor, but in the present embodiment, the contact temperature sensor will be described. The contact-type temperature sensor 26 is, for example, a thermocouple or a thermistor. The temperature sensor 26 is provided so as to protrude from an opening provided in the upper surface of the power receiver housing 21, and comes into contact with the bottom of the container 30 placed on the power receiver housing 21, thereby 30 temperature sensing. The temperature sensor 26 is urged upward by an elastic body such as a spring (not shown), so that the temperature sensor 26 sinks into the receiver housing 21 when the container 30 is placed on the temperature sensor 26 . I hope it is. Since the degree of contact between the temperature sensor 26 and the container 30 can be increased by urging the temperature sensor 26 upward by the elastic body, the detection accuracy of the temperature sensor 26 is also increased. The temperature sensor 26 is powered from the power receiving coil 22 via the power feeding circuit 24 . That is, the temperature sensor 26 operates by contactless power supply from the power transmission coil 12 (see FIG. 1). The temperature detected by the temperature sensor 26 is input to the power receiver controller 27 .

The power receiver control unit 27 has a memory for storing a set temperature for heating or cooling the container 30 and a CPU. The power receiver control unit 27 also has a transmission circuit 271 that transmits information about the temperature input from the temperature sensor 26 and the set temperature stored in the memory to the reception circuit 49 (see FIG. 10) of the plate unit 10 by wireless communication. have. The power receiver control unit 27 is configured by, for example, an IC chip (integrated circuit). The power receiver control unit 27 is powered from the power receiving coil 22 via the power feeding circuit 24 . That is, the power receiver controller 27 operates by contactless power supply from the power transmission coil 12 (see FIG. 1).

The set temperature stored in the memory of the power receiver control unit 27 is predetermined based on one or more conditions of the temperature controller 23, the amount of power supplied to the power receiving coil 22, and the size of the power receiver housing 21. It is For example, when the power receiver 20a and the power receiver 20b shown in FIG. 3 are provided with a heater for heating as the temperature controller 23, the power receiver 20a with a relatively large amount of power is stored with 60° C. as the set temperature. , 50° C. is stored as the set temperature for the power receiver 20b with a small amount of energization. For example, when the power receiver 20d and the power receiver 20f shown in FIG. Store 5°C. The power receiver 20f used for the side dish container 30c stores 10° C. as the set temperature.

FIG. 10 is a diagram for explaining the circuit configuration of the plate section 10 according to the third embodiment. In addition to the configuration shown in FIG. and The temperature maintenance button 15, the bus voltage control circuit 47, the first current sensor 481, the second current sensor 482, and the receiving circuit 49 are attached to or built into the plate housing 11 (see FIG. 1). .

The temperature maintenance button 15 is a button operated by the user when the user wishes to maintain the temperature of the container 30 placed on the placement section 16 (see FIG. 1). When the temperature maintenance button 15 is operated, the plate section 10 executes a temperature maintenance mode for maintaining the temperature of the container 30 . Although the details will be described later, when a plurality of power transmission coils 12 are provided in the plate portion 10, only one power transmission coil 12 is controlled in the temperature maintenance mode. The temperature maintenance button 15 can be realized by a push button, a sheet switch, a capacitive switch, or the like.

The bus voltage control circuit 47 is provided between the output side of the filter circuit composed of the smoothing reactor 42 and the smoothing capacitor 43 and the inverter 18, and is controlled by the control unit 17 to increase or decrease the bus voltage. When the power input from the commercial power supply 40 is AC 100V, the output of the filter circuit, that is, the peak voltage of the DC voltage with commercial frequency ripple is 100V×√2=141V. to implement.

The first current sensor 481 is connected to a resonance circuit composed of the second power transmission coil 122 and the second resonance capacitor 462, detects the current flowing through the second power transmission coil 122, and when the detected current exceeds the second threshold, the control unit 17 outputs a signal. The second current sensor 482 is connected to a resonance circuit composed of the third power transmission coil 123 and the third resonance capacitor 463, detects the current flowing through the third power transmission coil 123, and detects the current that exceeds the second threshold. 17 outputs a signal.

The receiving circuit 49 is a communication circuit that receives a wireless communication signal transmitted from the transmitting circuit of the power receiver control section 27 provided in the power receiver 20 . Upon receiving a signal from the power receiver control section 27 , the receiving circuit 49 transmits the received signal to the control section 17 .

The plate unit 10 of the present embodiment executes a temperature maintenance mode for controlling the energization state of the power transmission coil 12 so as to maintain the temperature of the container 30 at the set temperature set in the power receiver 20 . One mounting portion 16 , that is, the power transmission coil 12 to be controlled in the temperature maintenance mode is provided for each plate portion 10 . In the present embodiment, the control of the plate unit 10 will be described assuming that the power transmission coil 12 that is subject to the temperature maintenance mode is the first power transmission coil 121 .

FIG. 11 is a control flowchart of the plate section 10 according to the third embodiment. In FIG. 11, steps that perform the same processing as in FIG. 8 are given the same step numbers as in FIG. Since the processing of steps S1 to S6 is as described with reference to FIG. 8, the processing after step S6 will be described.

In step S6, it is determined whether or not the temperature maintenance button 15 has been turned on while the inverter 18 continues to operate at the fixed frequency, that is, the drive frequency f1 (step S11). If the ON operation has not been performed (step S11: NO), the process returns to step S4 to continue the process. When the ON operation is performed (step S11: YES), the temperature maintenance mode is entered, and bus voltage variable control is performed (step S12). If the power button 14 is not turned off (step S13: NO), the bus voltage variable control is continued, and if the power button 14 is turned off (step S13: YES), the process ends.

FIG. 12 is a flowchart for explaining the flow of bus voltage variable control according to the third embodiment. The bus voltage variable control controls the amount of electricity supplied to the power transmission coil 12, which is the target of the temperature maintenance mode, so that the container 30 is maintained at the set temperature.

In this embodiment, it is assumed that the power receiver 20 and the container 30 are placed on the first power transmission coil 121, which is the target of the temperature maintenance mode. The detected temperature of the container 30 and the set temperature are periodically and repeatedly transmitted from the power receiver controller 27 (see FIGS. 9 and 10) of the power receiver 20 .

(Step S121)
The temperature of the container 30 and the set temperature are transmitted from the power receiver control unit 27 of the power receiver 20 placed on the first power transmission coil 121, which is the target of the temperature maintenance mode in the present embodiment, and the transmitted information is acquired by the receiving circuit 49 .

(Step S122)
The bus voltage control circuit 47 raises or lowers the bus voltage so that the temperature of the container 30 obtained by the receiving circuit 49 approaches the set temperature. For example, if the set temperature of the power receiver 20 is 50° C. and the temperature of the container 30 is 35° C., the controller 17 sets the peak voltage of the bus voltage to 141 V×1.2=170 V. , a control signal is sent to the bus voltage control circuit 47 . By increasing the bus voltage, the high-frequency current flowing through the power receiving coil 22 is increased, and the current supplied to the temperature controller 23 from the power receiving coil 22 is increased. As a result, the amount of heating of the container 30 by the temperature controller 23 increases, and the temperature of the container 30 rises.

Also, when the user eats the food in the container 30, the food may decrease and the temperature of the container 30 may become higher than the set temperature. In this case, since it is detected in step S121 that the temperature of the container 30 is higher than the set temperature, the bus voltage control circuit 47 reduces the bus voltage. Specifically, the control unit 17 sends a control signal to the bus voltage control circuit 47 so that the peak voltage of the bus voltage becomes 141V×0.8=113V. By lowering the bus voltage, the high-frequency current flowing through the power receiving coil 22 is reduced, and the current supplied to the temperature controller 23 from the power receiving coil 22 is reduced. As a result, the amount of heating of the container 30 by the temperature controller 23 is reduced, and the temperature of the container 30 can be lowered.

(Step S123)
A power transmission coil current flowing through the second power transmission coil 122 and the third power transmission coil 123 is detected. The power transmission coil current is detected by the first current sensor 481 and the second current sensor 482 .

(Step S124)
It is determined whether or not any of the power transmission coil currents detected in step S123 exceeds the second threshold.

Here, in the present embodiment, as shown in FIG. 10 , a plurality of power transmission coils 12 (first power transmission coil 121, second power transmission coil 122, and third power transmission coil 123) are provided for one inverter 18. It is connected. When the bus voltage is stepped up or down in step S122, the energization amount of the power receiving coils 22 corresponding to the second power transmitting coil 122 and the third power transmitting coil 123, which are not subject to the temperature maintenance mode, also changes. Then, the container 30 above the second power transmission coil 122 and the third power transmission coil 123 may be overheated, underheated, overcooled, or undercooled. Therefore, in step S123, the values of the power transmission coil currents flowing through the second power transmission coil 122 and the third power transmission coil 123 are detected. Then, the presence or absence of the container 30 above the second power transmission coil 122 and the third power transmission coil 123 is detected by comparing the value of the detected power transmission coil current and the second threshold in step S124.

If there is no power transmitting coil current exceeding the second threshold in step S124 (step S124: NO), it indicates that the power receiver 20 and the container 30 are not above the second power transmitting coil 122 and the third power transmitting coil 123, respectively. Therefore, the process returns to FIG. 11 to continue the bus voltage variable control.

When the power transmission coil current exceeding the second threshold is detected in step S124 (step S124: YES), the power receiver 20 and the container 30 are placed on at least one of the second power transmission coil 122 and the third power transmission coil 123. It indicates that In this case, the process proceeds to step S125.

(Step S125)
A stop signal is input from the control unit 17 to the inverter 18, and the inverter 18 stops operating. At this time, the notification means may notify that the inverter 18 has stopped. The notification content of the notification means includes that the container 30 can be placed only on the first mounting portion 161 corresponding to the first power transmission coil 121 to which the temperature maintenance mode is applied among the plurality of power transmission coils 12. Good. By doing so, the reason why the inverter 18 has stopped can be communicated to the user, thereby avoiding user confusion. Further, the content of the notification by the notification means should be a warning not to place the power receiver 20 and the container 30 on the second mounting section 162 and the third mounting section 163, which are not subject to the temperature maintenance mode.

Note that the bus voltage of the inverter 18 may be changed after it is determined that the power receiver 20 and the container 30 are not placed on the second receiver 162 and the third receiver 163 . That is, the processes of steps S121 and S122 may be executed after the determination of NO in step S124.

Moreover, the power receiver 20 having the temperature sensor 26 and the power receiver control section 27 described in the present embodiment may be combined with the plate section 10 having one mounting section 16 and power transmission coil 12 . In this case, the transmission circuit 271 of the power receiver control section 27 sends the temperature detected by the temperature sensor 26 and the set temperature to the reception circuit 49 of the plate section 10 . The control unit 17 controls the drive frequency of the inverter 18 or controls the operating time and stop time of the inverter 18 so that the temperature of the container 30 obtained via the receiving circuit 49 approaches the set temperature. Alternatively, the bus voltage control circuit 47 raises or lowers the bus voltage. Even if the power receiver 20 having the temperature sensor 26 and the power receiver control part 27 is combined with the plate part 10 having one mounting part 16 and the power transmission coil 12 in this way, the temperature of the container 30 can be maintained at the set temperature. can be done.

As described above, the power receiver 20 of the present embodiment includes the temperature sensor 26 that is provided in the power receiver housing 21 and receives power from the power receiving coil 22 to detect the temperature of the container 30 . The power receiver 20 also includes a transmission circuit 271 that is provided in the power receiver housing 21 and that transmits a signal indicating the temperature of the container 30 detected by the temperature sensor 26 . The plate section 10 is provided with the plate housing 11 and includes a receiving circuit 49 that receives the signal transmitted from the transmitting circuit 271 . By using the temperature of the container 30 and the set temperature obtained by the receiving circuit 49 to control the inverter 18, the amount of heating or cooling of the temperature controller 23 fed from the power receiving coil 22 can be controlled.

The power receiver 20 also includes a power receiver controller 27 that is provided in the power receiver housing 21 and stores the set temperature of the container 30 . The plate unit 10 includes a bus voltage control circuit 47 that controls the bus voltage of the inverter 18 , and a transmission circuit 271 transmits a signal indicating the set temperature and the temperature of the container 30 detected by the temperature sensor 26 . When the receiving circuit 49 of the plate unit 10 receives the signal, the bus voltage control circuit 47 lowers or raises the bus voltage of the inverter 18 so that the temperature of the container 30 approaches the received set temperature. In this way, by feeding back the temperature of the container 30 and adjusting the bus voltage, the temperature of the container 30 placed on the placing section 16 can be maintained at the set temperature, and the food in the container 30 can be served at an appropriate temperature by the user. can be provided to

Further, in the present embodiment, the temperature of the container 30 is periodically transmitted from the power receiver 20, and the bus voltage of the inverter 18 is controlled based on the periodically transmitted temperature. Even when the amount of food inside decreases, the temperature of the container 30 is maintained at the set temperature. Therefore, the convenience of the user who eats can be improved.

Further, in the present embodiment, the temperature maintenance button 15 is provided on the plate portion 10, and the on/off operation of the temperature maintenance button 15 is used to switch between execution and non-execution of the bus voltage variable control in the temperature maintenance mode. When the bus voltage variable control is performed as in the present embodiment, even if the plate section 10 includes a plurality of mounting portions 16, the use of the mounting portions 16 not subject to the temperature maintenance mode is restricted. However, since the user can select whether or not to execute the temperature maintenance mode by operating the temperature maintenance button 15 , the container 30 is heated or cooled by a plurality of receivers 16 or the container is heated by a specific receiver 16 . The user can choose whether to maintain the temperature of 30. Therefore, electrical device 100 of the present embodiment can provide a meal according to the user's preference.

Also, if a contact temperature sensor is employed as the temperature sensor 26, detection results with less noise can be obtained with a simpler configuration than a non-contact temperature sensor. Therefore, the detection accuracy of the temperature of the container 30 can be improved.

Embodiment 4.
In the present embodiment, specific examples of positioning means for the power receiver 20 with respect to the plate portion 10 and positioning means for the container 30 with respect to the power receiver 20 will be described. This embodiment is combined with each of the first to third embodiments. Also, in the present embodiment, differences from the first to third embodiments will be mainly described.

FIG. 13 is a schematic cross-sectional view of main parts of the plate portion 10, the power receiver 20, and the container 30 according to the fourth embodiment. In FIG. 13, only the upper portion of the plate housing 11 is illustrated. A protrusion 51 that protrudes upward is provided on the upper surface of the plate housing 11 as a positioning means for the power receiver 20 . The projection 51 may be provided in an annular shape along the outer shape of the mounting portion 16 (see FIG. 2). The protrusions 51 may be partially provided along the outer shape of the mounting portion 16. In this case, two pairs of protrusions 51 arranged to face each other may be provided. When the planar shape of the mounting portion 16 is rectangular, L-shaped projections 51 may be provided at the four corners of the rectangle. By placing the power receiver 20 inside the protrusion 51 , the power receiver housing 21 is positioned on the inner surface of the protrusion 51 .

On the upper surface of the power receiver housing 21 of the power receiver 20 , a protrusion 52 is provided as a positioning means for the container 30 and protrudes upward. The protrusion 52 may be provided in an annular shape along the contour of the bottom of the container 30 . The protrusions 52 may be partially provided along the outer shape of the container 30. In this case, it is preferable to provide two pairs of protrusions 52 arranged to face each other. When the planar shape of the bottom of the container 30 is rectangular, L-shaped projections 52 may be provided at the four corners of the rectangle. By placing the container 30 inside the protrusion 52 , the container 30 is positioned on the inner surface of the protrusion 52 .

FIG. 14 is a schematic cross-sectional view of main parts of the plate part 10, the power receiver 20, and the container 30 according to another example of the fourth embodiment. In FIG. 14, only the upper portion of the plate housing 11 is illustrated. A concave portion 53 is provided on the upper surface of the plate housing 11 as positioning means for the power receiver 20 . The recessed portion 53 is recessed along the outer shape of the mounting portion 16 . By placing the power receiver 20 in the recess 53 , the power receiver housing 21 is positioned by the wall that connects the bottom of the recess 53 and the top surface of the plate housing 11 . A wall connecting the bottom of the recess 53 and the top surface of the plate housing 11 may be inclined as illustrated in FIG.

A concave portion 54 is provided on the upper surface of the power receiver housing 21 of the power receiver 20 as positioning means for the container 30 . The recess 54 is recessed along the contour of the bottom of the container 30 . By placing the container 30 in the recess 54 , the container 30 is positioned by the wall that connects the bottom of the recess 54 and the top surface of the power receiver housing 21 . A wall connecting the bottom of the recess 54 and the top surface of the power receiver housing 21 may be perpendicular to the top surface of the power receiver housing 21 as illustrated in FIG. 14, or may be inclined.

FIG. 15 is a schematic cross-sectional view of main parts of the plate part 10, the power receiver 20, and the container 30 according to another example of the fourth embodiment. An annular cylindrical wall 550 is provided on the upper surface of the plate housing 11 along the outer shape of the circular mounting portion 16 (see FIG. 2). A screw groove 551 is provided on the inner peripheral surface of the cylindrical wall 550 , and a screw 552 that is screwed into the screw groove 551 is provided on the outer peripheral surface of the lower portion of the disk-shaped power receiver housing 21 . The screw groove 551 and the screw 552 function as positioning means for the power receiver 20 with respect to the plate portion 10 . By disposing the disk-shaped power receiver housing 21 inside the cylindrical wall 550 and rotating the power receiver housing 21 , the screw 552 is screwed into the screw groove 551 , and the power receiver housing is attached to the plate housing 11 . A body 21 is fixed. The power receiver housing 21 is removed from the plate housing 11 by rotating the power receiver housing 21 in the direction opposite to when it is fixed.

Further, on the upper surface of the power receiver housing 21 of the power receiver 20 , an annular cylindrical wall 560 is provided along the contour of the bottom of the circular container 30 . A screw groove 561 is provided on the inner peripheral surface of the cylindrical wall 560 , and a screw 562 that is screwed into the screw groove 561 is provided on the outer peripheral surface of the lower portion of the round container 30 . The screw groove 561 and the screw 562 function as positioning means for detachably fixing the container 30 to the power receiver 20 . By placing the round container 30 inside the cylindrical wall 560 and rotating the container 30 or the power receiver 20 , the screw 562 is screwed into the thread groove 561 and the container 30 is fixed to the power receiver housing 21 . be done. The container 30 is removed from the power receiver housing 21 by rotating the container 30 or the power receiver 20 in the direction opposite to when it is fixed.

FIG. 16 is a schematic cross-sectional view of main parts of the plate portion 10, the power receiver 20, and the container 30 according to another example of the fourth embodiment. Referring to FIG. 16, positioning means for positioning the plate portion 10 and the power receiver 20 will be described. 16A shows a state in which the plate portion 10 and the power receiver 20 are not fixed, and FIG. 16B shows a state in which the plate portion 10 and the power receiver 20 are fixed. The plate housing 11 is provided with a through hole 571 penetrating through the plate housing 11 vertically. The diameter of the through-hole 571 is relatively small at the upper and lower ends and relatively large between the upper and lower ends. A rod-shaped pin 572 is inserted into the through hole 571 . A protrusion 573 is provided on the outer surface of the pin 572 . The pin 572 can move up and down inside the through hole 571 . As shown in FIG. 16A, when the pin 572 is dropped by its own weight, the lower portion of the pin 572 protrudes from the bottom of the plate housing 11. By being caught, the pin 572 is prevented from coming off the plate housing 11 .

A through hole 574 is provided in the power receiver housing 21 of the power receiver 20 . The through hole 574 is a hole extending vertically and has a diameter into which the pin 572 is inserted.

As shown in FIG. 16B, when the plate housing 11 is placed on the desk 600, the pin 572 protruding from the bottom of the plate housing 11 is pushed by the desk 600, and the pin 572 moves upward. Then, the top surface of the pin 572 protrudes from the top surface of the plate housing 11 . The power receiver casing 21 of the power receiver 20 is placed by inserting the pin 572 into the through hole 574 . Since the protrusion 573 is caught by the wall forming the upper end portion of the through hole 571 , the pin 572 will not come off from the upper surface of the plate housing 11 .

In the example of FIG. 16 , the pin 572 and the through hole 574 of the receiver housing 21 function as means for positioning the receiver 20 with respect to the plate section 10 . Although FIG. 16 shows a set of pins 572 and through holes 574, by providing a plurality of sets of such a structure consisting of pins 572 and through holes 574, the plate portion 10 can be moved in both the front-back direction and the left-right direction. positional deviation of the power receiver 20 to the position can be suppressed. Further, in the embodiment of FIG. 16, since the pin 572 is configured to be housed inside the plate housing 11, the top surface of the plate housing 11 can be easily cleaned. 16 may be adopted as the positioning structure between the power receiver 20 and the container 30. The structure shown in FIG.

As a positioning structure between the plate portion 10 and the power receiver 20 and a positioning means between the power receiver 20 and the container 30, a hook-and-loop fastener or a gel mat may be employed. In this case, a hook-and-loop fastener or a gel mat is attached to the facing surfaces of both of the positioning objects. Further, as the positioning structure between the plate portion 10 and the power receiver 20 and the positioning means between the power receiver 20 and the container 30, claws and engaging portions with which the claws are engaged may be employed. Alternatively, magnets may be provided in the upper portion of the power receiver 20 and the bottom of the container 30 so that the container 30 is attracted to the power receiver 20 by magnetic force.

As described above, by providing the positioning means for positioning the power receiver housing 21 of the power receiver 20 with respect to the plate housing 11 of the plate unit 10, the power supply efficiency of the contactless power supply by the electromagnetic induction system is lowered. can be suppressed. In non-contact power feeding by the electromagnetic induction method, the positional relationship between the power transmitting coil 12 and the power receiving coil 22 (see FIG. 1, etc.) has a great effect on the power feeding efficiency. If the power receiving coil 22 is not in a predetermined position with respect to the power transmitting coil 12, the power supply efficiency is reduced. is fixed, and a decrease in power supply efficiency is suppressed.

Further, by providing positioning means for positioning the power receiver housing 21 with respect to the plate housing 11, the power receiver 20 is prevented from falling when the user carries the plate section 10 on which the power receiver 20 is placed. be able to.

Further, by providing the positioning means for the power receiver 20 and the container 30 shown in the fourth embodiment, the power receiver 20 and the container 30 can be detachably attached, so that the effects described in the first to third embodiments can be achieved. It is possible to prevent the container 30 from falling off from the power receiver 20 while obtaining the effect. Moreover, by positioning the power receiver 20 and the container 30 , the action of heating or cooling the container 30 by the power receiver 20 is not impaired.

The positioning means between the plate portion 10 and the power receiver 20 and the positioning means between the power receiver 20 and the container 30 shown in FIGS. For example, the positioning means for the plate portion 10 and the power receiver 20 shown in FIG. 13 and the positioning means for the power receiver 20 and the container 30 shown in FIG. 14 may be combined.

10 plate part, 11 plate housing, 12 power transmission coil, 13 power supply plug, 14 power button, 15 temperature maintenance button, 16 placement part, 17 control part, 18 inverter, 19 notification means, 20 power receiver, 20a power receiver, 20b power receiver, 20c power receiver, 20d power receiver, 20e power receiver, 20f power receiver, 20g power receiver, 21 power receiver housing, 22 power receiving coil, 23 temperature controller, 24 power supply circuit, 25 display unit, 26 temperature sensor , 27 power receiver control unit, 30 container, 30a container, 30b container, 30c container, 40 commercial power supply, 41 rectifier circuit, 42 smoothing reactor, 43 smoothing capacitor, 44 current sensor, 45 snubber capacitor, 47 bus voltage control circuit, 49 Receiver circuit 51 Protrusion 52 Protrusion 53 Recess 54 Recess 100 Electrical equipment 121 First power transmission coil 122 Second power transmission coil 123 Third power transmission coil 124 Fourth power transmission coil 125 Fifth power transmission coil 161 First receiver 162 Second receiver 163 Third receiver 164 Fourth receiver 165 Fifth receiver 271 Transmission circuit 461 First resonance capacitor 462 Second resonance capacitor 463 third resonance capacitor, 481 first current sensor, 482 second current sensor, 550 cylinder wall, 551 screw groove, 552 screw, 560 cylinder wall, 561 screw groove, 562 screw, 571 through hole, 572 pin, 573 projection, 574 through holes, 600 desks.

Claims (12)

a plate housing having a mounting portion;
a power transmission coil housed in the plate housing and arranged under the mounting portion;
an inverter that supplies a high-frequency current to the power transmission coil;
a receiver housing mounted on the mounting portion;
a power receiving coil that is housed in the power receiver housing and receives power from the power transmitting coil in a contactless manner;
a temperature controller housed in the power receiver housing and powered by the power receiving coil;
and a container detachably attached to the power receiver housing and heated or cooled by the temperature controller. 2. The electric device according to claim 1, further comprising a display unit provided in said power receiver housing, operated by being fed power from said power receiving coil, and displaying information about the output temperature of said temperature controller. Either or both of positioning means for positioning the power receiver housing with respect to the plate housing and positioning means for positioning the container with respect to the power receiver housing are provided. Electrical equipment as described. a current sensor that detects a current flowing through the inverter and outputs a signal when the detected current exceeds a first threshold;
The electric device according to any one of claims 1 to 3, wherein the inverter stops when the signal from the current sensor is received. 5. The electric device according to claim 4, further comprising an informing means for informing that the inverter has stopped. a temperature sensor that is provided in the power receiver housing and receives power from the power receiving coil to detect the temperature of the container;
a transmission circuit provided in the power receiver housing for transmitting a signal indicating the temperature of the container detected by the temperature sensor;
a receiving circuit that is provided in the plate housing and receives a signal transmitted from the transmitting circuit;
The electric device according to any one of claims 1 to 5, wherein the inverter is controlled based on the signal received by the receiving circuit. 7. The electric device according to claim 6, wherein the temperature sensor is a contact temperature sensor provided so as to protrude from the upper surface of the power receiver housing. a power receiver control unit provided in the power receiver housing and storing a set temperature of the container;
A bus voltage control circuit for controlling a bus voltage of the inverter,
The transmission circuit transmits a signal indicating the set temperature and the temperature of the container detected by the temperature sensor,
7. When the receiving circuit receives the signal, the bus voltage control circuit lowers or raises the bus voltage of the inverter so that the temperature of the container approaches the received set temperature. Item 8. The electrical equipment according to item 7. A plurality of the power transmission coils are provided,
The same number of resonance capacitors as the plurality of power transmission coils,
a plurality of resonant circuits configured by connecting one of the power transmission coils and one of the resonant capacitors in series;
The electric device according to any one of claims 1 to 8, wherein the plurality of resonant circuits are connected in parallel to the inverter. When the bus voltage control circuit controls the bus voltage of the inverter, information indicating that the container can be placed only on the placement portion corresponding to one of the plurality of power transmission coils is provided. An electrical device as claimed in claim 9 when dependent on claim 8 to be notified. The electric device according to claim 9 or 10, wherein the inverter operates at a driving frequency in a lagging region higher than the resonance frequency of the resonance circuit. The electric device according to any one of claims 1 to 11, wherein the temperature controller is a heater or a Peltier element.

Images