KR20210076450A - Wireless power transfer apparatus - Google Patents

Abstract

Provided is a wireless electrical power transmitting device. The wireless electrical power transmitting device according to an exemplary embodiment of the present invention comprises: an antenna unit for transmitting a wireless electrical power; an EMI filter unit for filtering EMI generated from the antenna unit; a main substrate that supplies power to the antenna unit and controls an overall operation; and a coupling unit for electrically connecting the EMI filter unit and the main substrate while being physically engaged with each other. Therefore, the present invention is capable of improving stability of an operation.

Description

Wireless power transfer apparatus

The present invention relates to a wireless power transmission technology, and more particularly, to a wireless power transmission device that can be applied to a vehicle.

Portable electronic devices, including smartphones and tablet computers, have an increasing frequency of use in daily life, and the frequency of charging batteries is also increasing.

Accordingly, there is a demand for a charging method capable of charging the batteries of portable electronic devices while being more convenient and less restricted by places. The charging method using wireless power is suitable for the needs of such users, and its utility is increasing.

As a part of it, a magnetic induction method using an induced current of a coil, a magnetic resonance method using magnetic resonance between a transmitting coil and a receiving coil, etc. are employed as a wireless power charging method.

Since this magnetic induction method or magnetic resonance method is a method of transmitting or receiving wireless power using a magnetic field induced in a coil, when applied to a vehicle such as a vehicle, an Electro-Magnetic Interference (EMI) phenomenon occurs when generating wireless power. This may cause damage or malfunction of electronic components included in the vehicle.

Therefore, a method for solving this is required.

US 10-1879656 B1

The present invention has been devised in view of the above points, and it is an object of the present invention to provide a wireless power transmitter capable of preventing damage or malfunction of other components by shielding electromagnetic waves while performing a unique function of transmitting wireless power There is this.

In addition, another object of the present invention is to provide a wireless power transmitter capable of improving assembly properties by being able to configure the entire device through simple assembly.

In order to achieve the above object, the present invention provides an antenna unit for wireless power transmission; an EMI filter unit for filtering EMI generated from the antenna unit; a main board for supplying power to the antenna unit and controlling the overall operation; and a coupling unit electrically connecting the EMI filter unit and the main board to each other while physically coupling them.

In addition, the antenna unit may be disposed to be positioned between the EMI filter unit and the main board.

In addition, the antenna unit may include a magnetic field shielding member; and at least one antenna coil disposed on one surface of the magnetic shielding member, wherein the magnetic shielding sheet is a material comprising at least one of an amorphous alloy, a nanocrystalline alloy, ferrite, silicon steel, permalloy, and a polymer can be made with

In this case, the at least one antenna coil may be electrically connected to a circuit board constituting the EMI filter unit.

In addition, the EMI filter unit and the main board may maintain a state spaced apart from each other by a predetermined distance through the coupling unit.

In addition, the EMI filter unit may be a comb filter or may include a comb filter.

In one example, the EMI filter unit may include a circuit board; and a filter pattern formed on the circuit board.

As another example, the EMI filter unit may include a circuit board; a filter pattern formed on the circuit board; and a short-range wireless communication antenna disposed to surround the filter pattern.

In addition, the coupling unit may include: a first coupling member having one side fixed to the EMI filter unit and electrically connected to the EMI filter unit; and a second coupling member having one side fixed to the main board and electrically connected to the main board, and detachably coupled to the first coupling member to be connected to the first coupling member.

In addition, the wireless power transmitter may further include a temperature sensing member for sensing the temperature of the antenna unit. In this case, the temperature sensing member may be provided on one surface of the circuit board constituting the EMI filter unit.

For example, the temperature sensing member may be an SMD NTC thermistor (Surface Mount Device Negative Temperture Coefficient Thermistor) or may include an SMD NTC thermistor, and may be provided in a number corresponding to the total number of antenna coils constituting the antenna unit. have.

On the other hand, the present invention is an antenna unit including a magnetic field shielding member and at least one antenna coil for wireless power transmission; an EMI filter unit that filters EMI generated from the antenna unit and includes a circuit board and a filter pattern patterned on a surface of the circuit board; a main board for supplying power to the antenna unit and controlling the overall operation; A first coupling member having one side fixed to the circuit board and electrically connected to the filter pattern and the antenna coil, and one side fixed to the main board being electrically connected to the main board and detachably connected to the first coupling member. a coupling unit comprising a second coupling member coupled to the first coupling member; a short-range wireless communication antenna disposed to surround the filter pattern; and a temperature sensing member mounted on one surface of the circuit board facing the antenna coil to sense the temperature of the antenna unit, wherein the EMI filter unit and the main board are physically coupled to each other through the coupling unit and are electrically connected to each other. can be connected to

According to the present invention, while performing a unique function of transmitting wireless power, it is possible to prevent damage or malfunction of other components by shielding electromagnetic waves, thereby improving operational stability.

In addition, the present invention can configure the entire device through simple assembly, thereby improving the assembling property, thereby increasing work productivity and reducing assembly defects in the assembly process.

1 is a view showing a wireless power transmitter according to an embodiment of the present invention;
2 is a view of FIG. 1 viewed from another direction;
3 is a view showing a state in which the first coupling member and the second coupling member are separated in FIG. 1;
4 is a view of FIG. 3 viewed from another direction;
5 is a view showing a state in which the antenna unit is separated from the EMI filter unit in FIG. 3;
6 is a view from the bottom of the EMI filter unit that can be applied to the wireless power transmitter according to an embodiment of the present invention;
7 is a view showing an arrangement relationship between a temperature sensing member and an antenna coil that can be applied to a wireless power transmitter according to an embodiment of the present invention;
8 is a cross-sectional view along the AA direction of FIG. 1, and,
9 is a diagram illustrating a wireless power transmitter according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly explain 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 transmitter 100 according to an embodiment of the present invention may be implemented as an independent charging device or may be mounted on a transportation means such as a vehicle or various electronic devices.

For example, the wireless power transmitter 100 may be mounted on a console box of a vehicle to charge a battery of a portable electronic device including a smart phone, a wearable device, a tablet computer, and the like. Also, the wireless power transmitter 100 may filter a predetermined frequency band corresponding to noise among frequency bands induced during wireless power transmission.

To this end, the wireless power transmitter 100 according to an embodiment of the present invention, as shown in Figs. 1 to 4, the antenna unit 110, the EMI filter unit 120, the main board 130 and the combination unit 140 .

The antenna unit 110 transmits wireless power for charging the battery of the portable electronic device by generating a magnetic field having a predetermined frequency band using power supplied from the outside according to the control signal of the main board 130 . can

To this end, the antenna unit 110 may include a magnetic field shielding member 112 and at least one antenna coil 114 as shown in FIG. 5 .

That is, the magnetic field shielding member 112 may shield the magnetic field generated from the antenna coil 114 during wireless power transmission and focus it in a desired direction, and the at least one antenna coil 114 may be powered from the outside. can be used to generate a magnetic field having a predetermined frequency band.

For example, the magnetic field shielding member 112 may have a predetermined area and may be disposed on one surface of the antenna coil 114 , and may function as a shielding material for shielding the magnetic field generated by the antenna coil 114 . have.

Here, the magnetic field shielding member 112 may be made of a material containing at least one or more of an amorphous alloy, a nano-grain alloy, ferrite, silicon steel, and permalloy, but is not limited thereto. It can be used without restrictions. In addition, the magnetic field shielding member 112 may be a single-layer sheet, a multi-layer sheet in which a plurality of sheets are stacked, or formed separately into a plurality of pieces. In addition, the magnetic field shielding member 112 may be configured in a hybrid form in which heterogeneous sheets having different characteristics or different materials are combined.

Also, the antenna coil 114 may be a flat plate coil in which a conductive member having a predetermined wire diameter is wound a plurality of times in one direction. Here, the conductive member may be a Litz wire having a predetermined wire diameter, but is not limited thereto, and any known conductive material used for wireless power transmission may be used.

In addition, one antenna coil 114 may be provided, but a plurality of antenna coils 114 may be provided, and the plurality of antenna coils 114 may be arranged such that some of them overlap each other.

In this case, the antenna unit 110 may be disposed to be positioned between the EMI filter unit 120 and the main board 130 , and may be spaced apart from one surface of the main board 130 by a predetermined distance.

That is, as shown in FIG. 7 , both ends of the antenna coil 114 for electrical connection may be electrically connected to the circuit board 122 constituting the EMI filter unit 120 , and the magnetic field shielding It may be fixed to one surface of the member 112 .

Accordingly, the antenna unit 110 and the EMI filter unit 120 can maintain a state of being connected to each other, and the antenna unit 110 is an EMI filter unit 120 as shown in FIGS. 2 and 3, which will be described later. When physically separated from the main board 130 by using the coupling unit 140, it may be separated together with the EMI filter unit 120.

The EMI filter unit 120 may filter a predetermined frequency band corresponding to noise among frequency bands induced during wireless power transmission.

For example, the EMI filter unit 120 may filter electromagnetic waves of a radio frequency band or may filter a frequency of a short wave band. Through this, the EMI filter unit 120 can prevent a decrease in the radio listening sensitivity of the vehicle or prevent malfunction of electronic equipment such as ECU, and can prevent malfunction of a device used for communication.

To this end, the EMI filter unit 120 may be a known comb filter or a type including a comb filter.

For example, the EMI filter unit 120 may include a circuit board 122 and a filter pattern 124 formed on the circuit board 122 .

In this case, the circuit board 122 may be a double-sided main board, and various circuit patterns 122a for electrical connection may be formed on at least one surface of the circuit board 122 as shown in FIG. 6 . have. In addition, the filter pattern 124 may be a pattern formed to exhibit selective attenuation characteristics such as comb teeth in a predetermined frequency band.

Accordingly, the filter pattern 124 may be formed on the upper surface of the circuit board 122 , and the antenna coil 114 constituting the antenna unit 110 is positioned on the lower surface of the circuit board 122 . In the disposed state, it may be electrically connected to the lower surface of the circuit board 122 .

Although the drawing shows that the filter pattern 124 has a comb shape, the present invention is not limited thereto, and the filter pattern 124 may be changed into an appropriate shape according to a frequency band or frequency waveform to be filtered.

In this case, the EMI filter unit 120 may include a function of filtering a predetermined frequency band corresponding to noise among frequency bands induced during wireless power transmission and other additional functions.

For example, the EMI filter unit 120 may be added with a data transmission and reception function.

To this end, the EMI filter unit 120 may include a short-range wireless communication antenna 126 for short-range wireless communication.

Accordingly, the wireless power transmitter 100 according to an embodiment of the present invention may transmit and receive data using the short-range wireless communication antenna 126 as well as wireless power transmission using the antenna unit 110 . .

Through this, when the user charges the battery of the smartphone while the wireless power transmitter 100 according to an embodiment of the present invention is installed in the vehicle, the user checks various information of the vehicle through the smartphone or Various control signals such as seat position change, sound setting, etc. can be transmitted.

As a specific example, the short-range wireless communication antenna 126 may be an antenna pattern formed on one surface of the circuit board 122 .

In this case, the short-range wireless communication antenna 126 may be formed to surround the filter pattern 124 without overlapping with the filter pattern 124 .

That is, the short-range wireless communication antenna 126 may be formed on one surface of the circuit board 122 to surround the outer edge of the filter pattern 124 .

Accordingly, the wireless power transmitter 100 according to an embodiment of the present invention includes a filter pattern 124 for filtering noise using a single circuit board 122 and a short-range wireless communication antenna ( 126), it is possible to simplify the assembly process while implementing a plurality of various functions.

In addition, the short-range wireless communication antenna 126 may be formed so as to surround the filter pattern 124 and located outside the antenna coil 114 so as not to overlap the antenna coil 114 .

Through this, when using the wireless power transmitter 100 according to an embodiment of the present invention, the user does not change the location when charging a portable electronic device such as a smart phone, but wireless charging using the antenna coil 114 at the same location. And data communication using the short-range wireless communication antenna 126 may be both possible.

However, the short-range wireless communication antenna 126 is not limited to an antenna pattern, and the short-range wireless communication antenna 126 may include a coil in which a conductive member is wound a plurality of times like the antenna coil 114 .

The main board 130 may apply power supplied from the outside to the antenna unit 110 and the EMI filter unit 120 , and may control the overall operation of the wireless power transmitter 100 .

To this end, the main board 130 may include a control unit for controlling the overall operation, and a connector 132 for electrical connection with power supplied from the outside is provided on one side of the main board 130 . can be Here, the control unit may be a chipset such as an MCU mounted on one surface of the main board 130 , and various circuit patterns for mounting various devices on at least one surface of the main board 130 or for electrical connection with other components. can be formed.

At this time, the main board 130 may be detachably coupled to the EMI filter unit 120 via the coupling unit 140 as shown in FIGS. 2 and 3 , and the main board 130 . When the EMI filter unit 120 and the EMI filter unit 120 are coupled to each other, the main board 130 and the EMI filter unit 120 may be electrically connected to each other through the coupling unit 140 .

In addition, the EMI filter unit 120 and the main board 130 may maintain a state spaced apart from each other by a predetermined distance through the coupling unit 140 .

That is, when the EMI filter unit 120 and the main board 130 are coupled to each other, the circuit board 122 constituting the EMI filter unit 120 and the main board 130 serving as the main board are Through the coupling unit 140 , it can be electrically connected to each other while maintaining a state spaced apart from each other by a predetermined distance corresponding to the height of the coupling unit 140 .

For this reason, it is possible to prevent in advance the possibility of an electrical short circuit that may occur when the circuit board 122 and the main board 130 constituting the EMI filter unit 120 are close to each other, and the entire assembly process can be simplified. have.

In this case, as shown in FIG. 8 , the antenna unit 110 may be disposed between the EMI filter unit 120 and the main board 130 in a state in which they are connected to the EMI filter unit 120 , and each other A separate support member 160 for supporting the magnetic field shielding member 112 may be disposed between one surface of the magnetic field shielding member 112 of the antenna unit 110 and one surface of the main board 130 facing each other.

To this end, the coupling unit 140 may include a pair of coupling members 142 and 144 that can be physically detachably coupled while corresponding to each other, and the pair of coupling members 142 and 144 are the EMI filter units. One side may be provided in a fixed form on the side of 120 and the main board 130, respectively, and the pair of coupling members 142 and 144 may be energized when physically coupled.

For example, the coupling unit 140 may include a first coupling member 142 and a second coupling member 144 , and the first coupling member 142 has one side fixed to the EMI filter unit 120 . to be electrically connected to the EMI filter unit 120 , and one side of the second coupling member 144 is fixed to the main board 130 to be electrically connected to the main board 130 .

Specifically, the first coupling member 142 is on one surface of the circuit board 122 so that one side is electrically connected to the circuit pattern 122a formed on one surface of the circuit board 122 as shown in FIG. can be fixed.

Through this, when both end sides of the antenna coil 114 are electrically connected to the circuit board 122, the first coupling member 142 is connected to the antenna coil 114 through the circuit pattern 122a. may be electrically connected to each other.

In addition, when the first coupling member 142 and the second coupling member 144 are coupled, the main board 130 and the EMI filter unit 120 are the first coupling member 142 and the second coupling member ( 144) through which they may be electrically connected to each other. Accordingly, the control unit may control the operation of the EMI filter unit 120 and the antenna unit 110 .

As a non-limiting example, in the coupling unit 140 , a known pin header may be used as the first coupling member 142 , and a known pin header socket may be used as a second coupling member ( 144), but the present invention is not limited thereto, and various known members may be used as long as the coupling unit 140 can be physically coupled and separated from each other while being physically coupled to each other and electrically connected to each other.

As described above, the wireless power transmitter 100 according to an embodiment of the present invention can be physically coupled and separated through a pair of coupling members 142 and 144 corresponding to each other while being electrically connected through the physical coupling. The operation for electrically connecting the filter unit 120 and the antenna unit 110 to the main board 130 can be very simple, and a device that can satisfy both the wireless power transmission function and the EMI filtering function can be easily configured. have.

Meanwhile, the wireless power transmitter 100 according to an embodiment of the present invention may further include a temperature sensing member 150 for sensing the temperature of the antenna unit 110 .

Such a temperature sensing member 150 may sense the temperature of the antenna coil 114 during wireless power transmission. Through this, the control unit may allow or block the supply of power supplied to the antenna unit 110 based on the temperature information obtained through the temperature sensing member 150 .

For example, when the temperature information obtained through the temperature sensing member 150 is equal to or greater than a reference temperature, the controller may cut off the power supplied to the antenna unit 110 to prevent overheating.

In this case, the temperature sensing member 150 may be provided on one surface of the circuit board 122 constituting the EMI filter unit 120 .

For example, the temperature sensing member 150 may be an SMD NTC thermistor (Surface Mount Device Negative Temperture Coefficient Thermistor) or a type including an SMD NTC thermistor, and a circuit pattern 122a formed on one surface of the circuit board 122 . ) can be surface mounted.

Through this, the temperature sensing member 150 can be integrated with the EMI filter unit 120 like the short-range wireless communication antenna 126, and the first coupling member 142 and the second coupling member 144 are When combined, since it can be electrically connected to the main board 130 , wiring work for electrical connection with the main board 130 is unnecessary, so the assembly work can be very simple.

In the present invention, the temperature sensing member 150 may be provided in an appropriate number according to the total number and size of the antenna coil 114 . For example, the temperature sensing member 150 may be provided in a number corresponding to the total number of the antenna coils 114 .

In addition, the temperature sensing member 150 is positioned corresponding to the antenna coil 114 in a state where the antenna coil 114 is connected to the circuit board 122 so as to easily measure the heating temperature of the antenna coil 114 . can be placed in

For example, the temperature sensing member 150 may be disposed on the hollow side of the antenna coil 114 as shown in FIG. 7 , and may be disposed to directly contact the antenna coil 114 .

However, the installation position of the temperature sensing member 150 is not limited thereto, and any position capable of measuring the heating temperature of the antenna coil 114 may be appropriately changed according to design conditions.

Meanwhile, the wireless power transmitter 200 according to an embodiment of the present invention may be configured in a form in which the short-range wireless communication antenna 126 is omitted.

That is, as shown in FIG. 9 , the wireless power transmitter 200 may include an antenna unit 110 , an EMI filter unit 220 , a main board 130 , and a coupling unit 140 , and the EMI The filter unit 220 may be a form in which the above-described short-range wireless communication antenna 126 is omitted.

For example, the EMI filter unit 220 may include the above-described circuit board 122 and the filter pattern 124 formed on the circuit board 122 .

In the wireless power transmitter 200 of this embodiment, compared with the wireless power transmitter 100 of the above-described embodiment, all other contents except the short-range wireless communication antenna 126 may be employed the same, and the detailed content is described above. Since the content is the same, a detailed description thereof will be omitted.

In addition, in the above description, the wireless power transmitter 100, 200 according to an embodiment of the present invention has been described as a role of a wireless power transmitter that transmits wireless power so that the battery of an external electronic device can be charged, but it is not limited to this It may also consist of a wireless power receiver that receives wireless power transmitted from the outside. In this case, the above-described antenna coil 114 may serve as a receiving coil for receiving wireless power transmitted from the outside. As a non-limiting example, the wireless power transmitter 100 and 200 according to an embodiment of the present invention may be implemented as a wireless power transmitter for an electric vehicle or a wireless power receiver for an electric vehicle for wirelessly charging the battery of the electric vehicle. may be

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 can add components within the scope of the same spirit. , changes, deletions, additions, etc. may easily suggest other embodiments, but this will also fall within the scope of the present invention.

100,200: wireless power transmitter 110: antenna unit
112: magnetic shielding member 114: antenna coil
120,220: EMI filter unit 122: circuit board
122a: circuit pattern 124: filter pattern
126: short-range wireless communication antenna 130: main board
132: connector 140: coupling unit
142: first coupling member 144: second coupling member
150: temperature sensing member 160: support member

Claims (15)

An antenna unit for wireless power transmission;
an EMI filter unit for filtering EMI generated from the antenna unit;
a main board supplying power to the antenna unit and controlling overall operation; and
and a coupling unit electrically connecting the EMI filter unit and the main board to each other while physically coupling the main board. The method of claim 1,
The antenna unit is a wireless power transmitter disposed to be positioned between the EMI filter unit and the main board. The method of claim 1,
The antenna unit is
magnetic field shielding member; and
Wireless power transmitter including; at least one antenna coil disposed on one surface of the magnetic shielding member. 4. The method of claim 3,
The at least one antenna coil is a wireless power transmitter electrically connected to a circuit board constituting the EMI filter unit. 4. The method of claim 3,
The magnetic field shielding member,
A wireless power transmitter made of a material containing at least one of amorphous alloy, nano-grain alloy, ferrite, silicon steel, permalloy, and polymer. The method of claim 1,
The EMI filter unit is a comb filter or a wireless power transmitter including a comb filter. The method of claim 1,
The EMI filter unit,
circuit board; and
A wireless power transmitter comprising a; filter pattern formed on the circuit board. The method of claim 1,
The EMI filter unit,
circuit board;
a filter pattern formed on the circuit board; and
A wireless power transmitter comprising a; short-range wireless communication antenna formed to surround the filter pattern. The method of claim 1,
The coupling unit is
a first coupling member having one side fixed to the EMI filter unit and electrically connected to the EMI filter unit; and
A wireless power transmitter comprising a; a second coupling member having one side fixed to the main board and electrically connected to the main board, and detachably coupled to the first coupling member to be connected to the first coupling member. The method of claim 1,
The EMI filter unit and the main board are wireless power transmitter for maintaining a state spaced apart from each other by a predetermined distance through the coupling unit. The method of claim 1,
The wireless power transmitter,
Wireless power transmitter further comprising a temperature sensing member for sensing the temperature of the antenna unit. 12. The method of claim 11,
The temperature sensing member is a wireless power transmitter provided on one surface of a circuit board constituting the EMI filter unit. 12. The method of claim 11,
The temperature sensing member,
An SMD NTC thermistor (Surface Mount Device Negative Temperture Coefficient Thermistor) or a wireless power transmitter including an SMD NTC thermistor. 12. The method of claim 11,
The temperature sensing member,
A wireless power transmitter provided in a number corresponding to the total number of antenna coils constituting the antenna unit. An antenna unit including a magnetic field shielding member and at least one antenna coil for wireless power transmission;
an EMI filter unit that filters EMI generated from the antenna unit and includes a circuit board and a filter pattern patterned on a surface of the circuit board;
a main board for supplying power to the antenna unit and controlling the overall operation;
A first coupling member having one side fixed to the circuit board and electrically connected to the filter pattern and the antenna coil, and one side fixed to the main board being electrically connected to the main board and detachably connected to the first coupling member. a coupling unit comprising a second coupling member coupled to the first coupling member;
a short-range wireless communication antenna disposed to surround the filter pattern; and
and a temperature sensing member mounted on one surface of the circuit board facing the antenna coil to sense the temperature of the antenna unit,
The EMI filter unit and the main board are physically coupled to each other through the coupling unit and electrically connected to each other.

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