KR20230065620A - wireless power transfer system and accessory for kitchen appliance accessory including the same - Google Patents

Abstract

A wireless power transmission system is provided. A wireless power transmission system according to an exemplary embodiment of the present invention is a first shielding sheet formed in a hollow shape having both ends open and having a predetermined length and having a cross section in a direction perpendicular to the longitudinal direction formed in a closed loop shape; A first power transmission unit including a first coil wound a plurality of times along the longitudinal direction of the first shielding sheet so as to surround an outer circumferential surface of the first shielding sheet; And a second shielding sheet open at both ends, formed in a hollow shape having a predetermined length, and having a cross section in a direction perpendicular to the longitudinal direction formed in a closed loop shape, and the second shielding sheet so as to surround the inner circumferential surface of the second shielding sheet. A second power transmission unit including a second coil wound a plurality of times along the longitudinal direction of the shielding sheet; wherein any one of the first coil and the second coil is a transmission coil for transmitting power wirelessly, and the other coil is a transmission coil for transmitting power wirelessly. One coil is a receiving coil for receiving wireless power, and the first power transmission unit and the second power transmission unit are inserted into the second shielding sheet so that the first coil and the second coil While positioned between the first shielding sheet and the second shielding sheet, wireless power is transmitted in a state in which the entire length of the second coil overlaps with the first coil.

Description

Wireless power transfer system and accessory for kitchen appliances including the same {wireless power transfer system and accessory for kitchen appliance accessory including the same}

The present invention relates to a wireless power transmission system and accessories for kitchen appliances.

Wireless power transmission technology is a technology in which a receiving antenna receives wireless power transmitted from a transmitting antenna to charge a battery.

Such a wireless power transmission technology mainly uses a flat coil in which a conductive member is wound in one direction multiple times as an antenna for transmitting or receiving wireless power, or a solenoid type in which a conductive member is wound around a bar-shaped magnetic core.

However, if the antenna is configured in the form of a planar coil or solenoid, there is a problem in that efficiency is lowered when the arrangement angle between the wireless power receiving module and the wireless power transmitting module is changed.

In addition, if the antenna is configured in the form of a flat coil or solenoid, since the magnetic field generated when power is applied is focused on the central portion of the coil, other components such as a circuit board or a battery cannot be disposed in the central portion of the coil.

Accordingly, the wireless power transmission technology using a planar coil or solenoid type antenna has difficulty in applying to a small-sized device because other parts cannot be placed in the center of the coil.

The present invention has been devised in view of the above points, and provides a wireless power transmission system in which wireless power transmission can be performed smoothly regardless of the arrangement angle of the receiving coil and the transmitting coil, and accessories for kitchen appliances including the same. There is a purpose.

In addition, another object of the present invention is to provide a wireless power transmission system capable of utilizing the central portion of a coil and accessories for kitchen appliances including the same.

In order to achieve the above object, the present invention is a first shielding sheet formed in a hollow shape having both ends open and having a predetermined length, and a cross section in a direction perpendicular to the longitudinal direction is formed in a closed loop shape, and the first shielding sheet A first power transmission unit including a first coil wound a plurality of times along the longitudinal direction of the first shielding sheet so as to surround an outer circumferential surface of the first shielding sheet; And a second shielding sheet open at both ends, formed in a hollow shape having a predetermined length, and having a cross section in a direction perpendicular to the longitudinal direction formed in a closed loop shape, and the second shielding sheet so as to surround the inner circumferential surface of the second shielding sheet. A second power transmission unit including a second coil wound a plurality of times along the longitudinal direction of the shielding sheet; wherein any one of the first coil and the second coil is a transmission coil for transmitting power wirelessly, and the other coil is a transmission coil for transmitting power wirelessly. One coil is a receiving coil for receiving wireless power, and the first power transmission unit and the second power transmission unit are inserted into the second shielding sheet so that the first coil and the second coil It provides a wireless power transmission system in which wireless power is transmitted in a state where the entire length of the second coil overlaps with the first coil while being located between the first shielding sheet and the second shielding sheet.

Also, the total length of the first coil may be equal to or relatively shorter than the total length of the second coil.

In addition, each of the first shielding sheet and the second shielding sheet may be formed by winding a single-layer magnetic sheet twice or more.

In addition, the first power transmission unit may include a first bobbin made of a non-magnetic material and formed in a hollow shape, and the first shielding sheet may be disposed to surround an outer circumferential surface of the first bobbin. In this case, the second power transmission unit may include a second bobbin made of a non-magnetic material and formed in a hollow shape, and the second coil may be wound multiple times along an outer circumferential surface of the second bobbin. there is.

On the other hand, the present invention is a housing having an inner space, a first shielding sheet disposed to surround the outer circumferential surface of the housing, and a plurality of times wound along the longitudinal direction of the housing to surround the first shielding sheet and wireless power a power receiver including a receiving coil for receiving and a circuit board disposed in the inner space; And a hollow body having a predetermined length, a transmission coil wound multiple times along the longitudinal direction of the body so as to surround the outer circumferential surface of the body and transmitting wireless power when power is supplied, and covering the transmission coil to transmit the transmission. and a power transmission unit including a second shielding sheet disposed along a circumferential surface of the body to shield a magnetic field generated from the coil, wherein the housing is detachably coupled to the body, and the body and the housing are detachably coupled to the body. When coupled, the receiving coil is disposed within the transmitting coil and overlaps with the transmitting coil, providing an accessory for kitchen appliances.

In addition, the entire length of the receiving coil may be provided to have a length equal to or relatively shorter than the entire length of the transmitting coil.

In addition, the power receiving unit may further include a capacitor mounted on the circuit board to store power using the power received from the receiving coil.

In addition, the first shielding sheet may be a single-layer magnetic sheet, and the first shielding sheet may be wound around the main body such that the single-layer magnetic sheet surrounds the circumferential surface of the housing two or more times.

In addition, the second shielding sheet may be a single-layer magnetic sheet, and the second shielding sheet may be wound around the housing so that the single-layer magnetic sheet surrounds the circumferential surface of the body two or more times.

In addition, the power receiver may be a cooking thermometer including a probe thermometer having a temperature sensor at one end and coupled to the housing at the other end, and the power transmitter in a state where the cooking thermometer is mounted. It may be a charging cradle for transmitting wireless power to the receiving coil.

The power receiving unit may further include a memory unit storing information measured by the temperature sensor and a communication module transmitting the information stored in the memory unit to the outside.

According to the present invention, even if a receiving coil or a transmitting coil is configured with one coil, wireless power transmission can be performed smoothly regardless of the arrangement angle of the receiving coil and the transmitting coil.

In addition, according to the present invention, the degree of freedom in design can be increased by utilizing the central portion of the coil to arrange parts such as a circuit board.

1 is a diagram showing a wireless power transmission system according to an embodiment of the present invention;
Figure 2 is a view in which the main components are separated from Figure 1;
3 is a longitudinal sectional view showing a state in which the first power transmission unit is inserted into the second power transmission unit in FIG. 1;
4 is a schematic view showing a method of forming a first shielding sheet and a second shielding sheet;
5 is a view showing a state in which a circuit board is disposed in a first power transmission unit in a wireless power transmission system according to an embodiment of the present invention;
6 is a simulation diagram showing a magnetic field distribution when a current of 100 mA is applied in FIG. 5, (a) is a case of viewing FIG. 5 from the top, (b) is a view showing a case of viewing FIG. 5 from the front,
7 is a view showing an accessory for kitchen appliances according to an embodiment of the present invention;
8 is a view showing a state in which the cooking thermometer and the charging cradle are separated in FIG. 7;
Figure 9 is a view in which the main components are separated from Figure 8;
10 is a cross-sectional view in the direction AA of FIG. 7;
Figure 11 is a schematic diagram showing a method of forming a first shielding sheet and a second shielding sheet in Figure 8, and,
FIG. 12 is a block diagram showing the main configuration of a cooking thermometer that can be applied to FIG. 7 .

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. This invention may be embodied in many different forms and is not limited to the embodiments set forth herein. In order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and the same reference numerals are added to the same or similar components throughout the specification.

The wireless power transmission system 100 according to an embodiment of the present invention includes a first power transmission unit 110 and a second power transmission unit 120 as shown in FIGS. 1 to 4 .

In the present invention, the first power transmission unit 110 may include a first coil 112 and a first shielding sheet 111, and the second power transmission unit 120 may include a second coil 122 And it may include a second shielding sheet (121).

In this case, each of the first coil 112 and the second coil 122 may have a shape similar to a known coil spring, and any one of the first coil 112 and the second coil 122 may have a shape similar to that of a known coil spring. The coil may be provided to have a relatively larger size than the other coil to accommodate the other coil therein.

In addition, the first shielding sheet 111 may be a magnetic sheet made of a magnetic material to shield a magnetic field, and may be disposed to surround an inner circumferential surface or an outer circumferential surface of the first coil 112, The second shielding sheet 121 may be disposed to surround an inner circumferential surface or an outer circumferential surface of the second coil 122 .

For example, each of the first coil 112 and the second coil 122 may have a hollow cylindrical or polygonal column shape in which a conductive member is wound multiple times along one direction, and the first coil 112 and the One of the two coils 122 may serve as a transmitting coil for transmitting wireless power, and the other coil may serve as a receiving coil for receiving wireless power.

In addition, the first shielding sheet 111 may be formed in a hollow shape having both ends open and having a predetermined length so as to cover the inner circumferential surface or the outer circumferential surface of the first coil 112, and is perpendicular to the longitudinal direction. A cross section in one direction may be formed to have a closed loop shape such as a circular cross section or a polygonal cross section.

Similarly, the second shielding sheet 121 may be a magnetic sheet made of a magnetic material to shield a magnetic field, and both ends are open to cover the inner circumferential surface or the outer circumferential surface of the second coil 122. It may be formed in a hollow shape having a predetermined length, and a cross section in a direction perpendicular to the longitudinal direction may be formed to have a closed loop shape such as a circular cross section or a polygonal cross section.

Hereinafter, for convenience of description, it will be described that the first coil 112 is a receiving coil and the first shielding sheet 111 is disposed to surround the inner circumferential surface of the first coil 112 .

In addition, the second coil 122 is a transmission coil having a relatively larger size than the first coil 112, and the second shielding sheet 121 surrounds the outer circumferential surface of the second coil 122. It will be described as being arranged in a diagram.

Specifically, the first power transmission unit 110 is formed in a hollow shape having both ends open and having a predetermined length, and a first shielding sheet 111 in which a cross section in a direction perpendicular to the longitudinal direction is formed in a closed loop shape, It may include a first coil 112 wound a plurality of times along the longitudinal direction of the first shielding sheet 111 so as to surround the outer circumferential surface of the first shielding sheet 111 .

In this case, the first power transmission unit 110 may further include a hollow first bobbin 113 made of a non-magnetic material and having both ends open, and the first shielding sheet 111 may further include the first bobbin 113 . 1 may be arranged to surround the outer circumferential surface of the bobbin 113.

Accordingly, in the first power transmission unit 110, a hollow part having both ends open may be formed along the longitudinal direction of the first bobbin 113, and the first coil 112 may be formed in the first shielding sheet ( 111) is wound multiple times along the longitudinal direction of the first shielding sheet 111 so as to surround the outer circumferential surface of the first shielding sheet 111 in a state where it is disposed to surround the circumferential surface of the first bobbin 113 It can be.

Here, as described above, the first coil 112 may be a receiving coil for receiving wireless power transmitted from the outside, and the first power transmitter 110 may serve as a wireless power receiving module.

In addition, the first power transmission unit 110 prevents the first coil 112 from being exposed to the outside and fixes the position of the first coil 112 to the first coil 112. A fixing member 114 surrounding the outer surface may be further included.

Here, the fixing member 114 may be a known insulating tape coated with an adhesive layer on one surface.

In addition, the second power transmission unit 120 is formed in a hollow shape having both ends open and having a predetermined length, and a second shielding sheet 121 having a cross section in a direction perpendicular to the longitudinal direction formed in a closed loop shape, It may include a second coil 122 wound a plurality of times along the longitudinal direction of the second shielding sheet 121 so as to surround the inner circumferential surface of the second shielding sheet 121 .

In this case, the second power transmission unit 120 may further include a hollow second bobbin 123 made of a non-magnetic material and having both ends open, and the second coil 122 may further include the second bobbin 123 . It may be wound multiple times along the outer circumferential surface of the bobbin 123 .

Accordingly, in the second power transmission unit 120, a hollow part having both ends open may be formed along the longitudinal direction of the second bobbin 123, and the second coil 122 may have a hollow part formed in the second bobbin 123. ), the hollow shape can be maintained, and the second shielding sheet 121 is the second coil 122 in a state in which the second coil 122 is wound along the circumference of the second bobbin 123. ) may be arranged to surround the outer circumferential surface of the

Here, as described above, the second coil 122 may be a transmission coil for transmitting wireless power to the outside when power is applied, and the second power transmission unit 120 may serve as a wireless power transmission module. .

In addition, the second power transmission unit 120 may further include a fixing member 124 surrounding an outer surface of the second shielding sheet 121 .

Here, the fixing member 124 may be a known insulating tape coated with an adhesive layer on one surface.

At this time, the second coil 122 and the second bobbin 123 may have a relatively larger size than the first coil 112 and the first bobbin 113, and the The overall length L1 may have a length equal to or relatively shorter than the overall length L2 of the second coil 122 .

Accordingly, the first power transmission unit 110 can be inserted into the second power transmission unit 120 as shown in FIG. 3, and the first coil 112 and the second coil 122 ) Is positioned between the first shielding sheet 111 and the second shielding sheet 121, and the entire length L2 of the second coil 122 is disposed so that the first coil 112 overlaps with each other. Wireless power can be transmitted from

Due to this, the first coil 112 and the second coil 122 can perform wireless power transmission through inband communication that satisfies the Qi standard, and the first coil 112 and Even if the second coil 122 serving as a transmission coil is composed of one, the first coil 112 and the second coil 122 may maintain an overlapping state.

Through this, in the wireless power transmission system 100 according to an embodiment of the present invention, wireless power transmission can be smoothly performed regardless of the arrangement angle of the receiving coil and the transmitting coil.

In addition, in the wireless power transmission system 100 according to an embodiment of the present invention, the first coil 112 and the second coil 122 are between the first shielding sheet 111 and the second shielding sheet 121 Corresponds to the hollow part of the first bobbin 113 because wireless power is transmitted in a state where the entire length L2 of the second coil 122 overlaps with the first coil 112 while being located at The influence of the magnetic field generated from the first coil 112 and the second coil 122 may be insignificant on the central portion of the first shielding sheet 111 to be performed (see FIGS. 6a and 6b).

This can be confirmed through Table 1 and FIGS. 6A and 6B below.

In Table 1, Comparative Examples 1 to 4 are results of measuring FOD (foreign object damage) efficiency in a state in which the circuit board 214 is not disposed on the hollow side of the first bobbin 113, Examples 1 to 4 are results obtained by measuring FOD efficiency in a state in which the circuit board 214 is disposed on the side of the hollow part of the first bobbin 113 as shown in FIG. 5 .

In addition, for the first coil 112, a conductive member having a diameter of 0.3 pi and a coupling inductance of 8.02 μH was wound 28 times, and the second coil 122 had a diameter of 0.7 pi and a coupling inductance of 31.9 μH. A conductive member having inductance was wound 14 times.

In this case, the mutual inductance of the first coil 112 and the second coil 122 was 11.64 μH, and the coupling coefficient of the first coil 112 and the second coil 122 was 0.7269.

input voltage
(V) input current
(A) input power
(W) output voltage
(V) output current
(A) output power
(W) efficiency(%) Comparative Example 1


5 0.13 0.66


5 0 0 0 Comparative Example 2 0.18 0.9 0.03 0.15 16.7 Comparative Example 3 0.21 1.06 0.05 0.25 23.7 Comparative Example 4 0.27 1.34 0.1 0.5 37.3 Example 1 0.13 0.66 0 0 0 Example 2 0.18 0.9 0.03 0.15 16.8 Example 3 0.21 1.05 0.05 0.25 23.9 Example 4 0.26 1.32 0.1 0.5 37.9

As can be seen from Table 1 above, even if the circuit board 214 is disposed on the side of the hollow part of the first bobbin 113, it can be seen that there is no loss of FOD efficiency.

Accordingly, in the wireless power transmission system 100 according to an embodiment of the present invention, a circuit board 214 may be disposed on the hollow side of the first bobbin 113 or a cable for electrical connection may be disposed, (See FIG. 5), even if a foreign substance such as a metal is disposed on the side of the hollow part of the first bobbin 113 or the hollow part of the second bobbin 123, the heat generation problem of the metal due to the FOD or the power consumption due to the metal foreign substance Efficiency reduction or loss due to increase may not occur.

Through this, the wireless power transmission system 100 according to an embodiment of the present invention can utilize the hollow part of the first bobbin 113, thereby increasing the degree of freedom in design.

In addition, in the wireless power transmission system 100 according to an embodiment of the present invention, the first shielding sheet 111, the first coil 112, the second coil 122, and the second shielding sheet 121 are all hollow. Since wireless power transmission is performed in a state in which the first coil 112 and the second coil 122 are overlapped between the first shielding sheet 111 and the second shielding sheet 121, the installation It can be efficiently applied to products with limited space.

At this time, each of the first shielding sheet 111 and the second shielding sheet 121 may be a multi-layered magnetic sheet having a predetermined thickness, but may be formed by winding a single-layered magnetic sheet twice or more.

That is, as shown in FIG. 4, the first shielding sheet 111 may be formed by winding a single-layer magnetic sheet two or more times along the circumferential surface of the first bobbin 113, and the second shielding sheet 121 may be formed by winding a single-layer magnetic sheet two or more times to surround the circumference of the second coil 122 wound along the circumferential surface of the second bobbin 123.

Through this, even if the first shielding sheet 111 and the second shielding sheet 121 are used as single-layer magnetic sheets in the wireless power transmission system 100 according to an embodiment of the present invention, the single-layer magnetic sheet is multi-layered. The same effect as the laminated multi-layer sheet can be implemented, and the characteristics can be variously changed by appropriately increasing or decreasing the number of turns of the magnetic sheet.

Due to this, in the wireless power transmission system 100 according to an embodiment of the present invention, each of the first shielding sheet 111 and the second shielding sheet 121 is implemented through a single-layer magnetic sheet, thereby reducing the production cost. and increase design freedom.

Meanwhile, the wireless power transmission system 100 described above may be applied to the accessory 200 for kitchen appliances.

For example, the kitchen appliance accessory 200 may include a power receiver and a power transmitter as shown in FIGS. 7 to 11 , and the power receiver may include a probe-type thermometer having a temperature sensor 215a at one end thereof. It may be a cooking thermometer 210 including a 215, and the power transmitter wireless power to the receiving coil 213 included in the cooking thermometer 210 in a state where the cooking thermometer 210 is mounted. It may be a charging cradle 220 for sending out.

Here, the temperature sensor 215a may be a known NTC thermistor, but is not limited thereto, and various known temperature sensors may all be applied.

Specifically, the cooking thermometer 210 includes a housing 211 having an inner space, a first shielding sheet 212 disposed to surround an outer circumferential surface of the housing 211, and the first shielding sheet ( 212), a receiving coil 213 that is wound multiple times along the longitudinal direction of the housing 211 and receives wireless power, a circuit board 214 disposed in the inner space, and a temperature sensor at one end ( 215a) may include a probe-type thermometer 215 having the other end coupled to the housing 211.

Here, the housing 211 may include a placement groove 211a formed to be drawn inward at a certain depth, and the first shielding sheet 212 and the receiving coil 213 are disposed on the side of the placement groove 211a At least a portion of the circuit board 214 may be positioned at a position corresponding to the placement groove 211a in the inner space. In addition, a fixing member 219 covering the outer circumferential surface of the receiving coil 213 is disposed on the side of the placement groove 211a in a state where the first shielding sheet 212 and the receiving coil 213 are sequentially disposed. can

In this case, the first shielding sheet 212, the receiving coil 213, and the fixing member 219 constituting the cooking thermometer 210 are the first shielding sheet 111 and the first coil 112 described above. and a fixing member 114, and a portion of the housing 211 in which the placement groove 211a is formed may serve as the above-described first bobbin 113.

The charging cradle 220 has a hollow body 221 having a predetermined length and an open top, and is wound multiple times along the longitudinal direction of the body 221 so as to surround the outer circumferential surface of the body 221. A transmission coil 222 for transmitting wireless power when power is supplied, and a transmission coil 222 disposed along the circumferential surface of the main body 221 to cover the magnetic field generated by the transmission coil 222 A second shielding sheet 223 may be included.

Here, the main body 221 may include a placement groove 221a that is drawn inward at a certain depth, and the second shielding sheet 223 and the transmission coil 222 are disposed on the side of the placement groove 221a. It can be.

In this case, the second shielding sheet 223 and the transmitting coil 222 constituting the charging cradle 220 may be the above-described second shielding sheet 121 and the second coil 122, and the main body ( 221), the portion where the arrangement groove 221a is formed may serve as the above-described second bobbin 123. In addition, a fixing member 224 covering the outer circumferential surface of the second shielding sheet 223 in a state in which the transmission coil 222 and the second shielding sheet 223 are sequentially disposed on the side of the arrangement groove 221a is can be placed.

At this time, as shown in FIG. 8, the housing 211 may be detachably coupled to the main body 221, and when the housing 211 and the main body 221 are coupled, the housing 211 is formed in the housing 211. The placement groove 211a and the placement groove 221a formed in the main body 221 may be disposed at overlapping positions, and the cooking thermometer 210 uses the power received from the receiving coil 213. A capacitor 216 mounted on the circuit board 214 may be further included to store power.

Accordingly, as shown in FIG. 7 , when the cooking thermometer 210 is inserted into the open upper side of the main body 221, the probe thermometer 215 and a part of the housing 211 are moved to the main body 221. ), and as shown in FIG. 10, the receiving coil 213 may be disposed to overlap the transmitting coil 222 while being positioned within the transmitting coil 222.

As a result, in a state where the cooking thermometer 210 is mounted on the charging cradle 220, the transmission coil 222 can transmit wireless power to the reception coil 213, and the capacitor 216 Electricity can be stored using the wireless power received through the receiving coil 213, and the cooking thermometer 210 can use the energy stored in the capacitor 216 as a driving power source.

Meanwhile, the cooking thermometer 210 may include a control unit for controlling overall driving, and a switch unit 211b for turning on/off driving of the control unit through a user's manipulation is provided on the housing 211. It may be provided on one side.

In addition, the cooking thermometer 210 includes a memory unit 217 for storing the information measured by the temperature sensor 215a, and transmitting the information stored in the memory unit 217 to the outside or using the temperature sensor 215a. It may further include a communication module 218 that transmits information measured from the outside, and the temperature sensor 215a, the memory unit 217, the communication module 218, and the receiving coil 213 are connected through the control unit. Driving can be controlled.

Accordingly, the control unit can use the energy stored in the capacitor 216 as a driving power source through the interaction of the transmission coil 222 and the reception coil 213 as described above, and the temperature sensor 215a The measured information may be stored in the memory unit 217 or transmitted to the outside through the communication module 218 .

For example, the control unit may communicate with a kitchen appliance or a portable electronic device through the communication module 218, and the kitchen appliance may be a known induction stove, and the portable electronic device may be a tablet or a mobile phone.

Through this, the kitchen appliances or portable electronic devices can output information transmitted from the communication module 218 .

However, the configuration of the cooking thermometer 210 is not limited thereto, and the cooking thermometer 210 may include a separate display unit (not shown) for outputting information measured by the temperature sensor 215a. may be In addition, in the cooking thermometer 210, the capacitor 216 may be a known super capacitor, but is not limited thereto, and various known capacitors may all be used, and the capacitor 216 may be the receiving coil 213 ) may be replaced with a known secondary battery that can be recharged using wireless power received from.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments presented herein, and those skilled in the art who understand the spirit of the present invention may add elements within the scope of the same spirit. However, other embodiments can be easily proposed by means of changes, deletions, additions, etc., but these will also fall within the scope of the present invention.

100: wireless power transmission system 110: first power transmission unit
111: first shielding sheet 112: first coil
113: first bobbin 114: fixing member
120: second power transmission unit 121: second shielding sheet
122: second coil 123: second bobbin
124: fixing member 200: accessories for kitchen appliances
210: cooking thermometer 211: housing
211a: placement groove 211b: switch unit
212: first shielding sheet 213: receiving coil
214: circuit board 215: probe thermometer
215a: temperature sensor 216: capacitor
217: memory unit 218: communication module
219: fixing member 220: charging cradle
221: main body 221a: placement groove
222: transmission coil 223: second shielding sheet
224: fixing member

Claims (11)

A first shielding sheet having both ends open and formed in a hollow shape having a predetermined length and having a closed loop cross section in a direction perpendicular to the longitudinal direction, and the first shielding sheet so as to surround the outer circumferential surface of the first shielding sheet. A first power transmission unit including a first coil wound a plurality of times along the longitudinal direction of the sheet; and
A second shielding sheet open at both ends and formed in a hollow shape having a predetermined length and having a cross section in a direction perpendicular to the longitudinal direction in a closed loop shape, and the second shielding sheet so as to surround the inner circumferential surface of the second shielding sheet. A second power transmission unit including a second coil wound a plurality of times along the longitudinal direction of the sheet; including,
One of the first coil and the second coil is a transmitting coil for transmitting wireless power and the other coil is a receiving coil for receiving wireless power,
The first power transmission unit and the second power transmission unit,
The first power transmission unit is inserted into the second shielding sheet so that the first coil and the second coil are positioned between the first shielding sheet and the second shielding sheet so that the entire length of the second coil is the first and second coils. A wireless power transmission system in which wireless power is transmitted in a state in which coils are arranged to overlap each other. According to claim 1,
The wireless power transmission system in which the total length of the first coil is provided to have the same or relatively shorter length than the total length of the second coil. According to claim 1,
Each of the first shielding sheet and the second shielding sheet is a wireless power transmission system formed by winding a single-layer magnetic sheet twice or more. According to claim 1,
The first power transmission unit includes a first bobbin made of a non-magnetic material and formed in a hollow shape, and the first shielding sheet is disposed to surround an outer circumferential surface of the first bobbin,
The second power transmission unit includes a second bobbin made of a non-magnetic material and formed in a hollow shape, and the second coil is wound a plurality of times along an outer circumferential surface of the second bobbin. A housing having an inner space, a first shielding sheet disposed to surround an outer circumferential surface of the housing, and a receiving coil wound multiple times along the longitudinal direction of the housing to surround the first shielding sheet and receiving wireless power and a power receiver including a circuit board disposed in the inner space; and
A hollow body having a predetermined length, a transmission coil that is wound multiple times along the longitudinal direction of the body so as to surround the outer circumferential surface of the body and transmits wireless power when power is supplied, and the transmission coil covering the transmission coil A power transmission unit including a second shielding sheet disposed along the circumferential surface of the main body to shield the magnetic field generated from; including,
The housing is detachably coupled to the body,
When the main body and the housing are coupled, the receiving coil is disposed within the transmitting coil and overlaps with the transmitting coil. According to claim 5,
The total length of the receiving coil is equal to or relatively shorter than the total length of the transmitting coil. According to claim 5,
The kitchen appliance accessory further comprises a capacitor mounted on the circuit board so that the power receiving unit can store power using the power received from the receiving coil. According to claim 5,
The first shielding sheet is a single-layer magnetic sheet,
The first shielding sheet is a kitchen appliance accessory that is wound around the body so that the single-layer magnetic sheet surrounds the circumferential surface of the housing twice or more. According to claim 5,
The second shielding sheet is a single-layer magnetic sheet,
The second shielding sheet is a kitchen appliance accessory that is wound around the housing so that the single-layer magnetic sheet surrounds the circumferential surface of the main body twice or more. According to claim 5,
The power receiver is a cooking thermometer including a probe-type thermometer having a temperature sensor at one end and coupled to the housing at the other end;
The power transmission unit is a charging cradle that transmits wireless power toward the receiving coil in a state where the cooking thermometer is mounted. According to claim 10,
The power receiving unit further includes a memory unit storing the information measured by the temperature sensor and a communication module transmitting the information stored in the memory unit to the outside.

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