KR101754935B1 - Wireless charging structure for pen type wireless device - Google Patents

Abstract

The present invention relates to a wireless charging structure of a wireless device, and more particularly, to a wireless charging device having a battery and a wireless device having a power receiving module electrically connected to the battery; And a charger having a power transmission module for transmitting wireless power in a self-induction manner to the power receiving module, wherein the wireless device includes a function module and a heat transfer efficiency A battery casing formed of the high metal material; And a battery module accommodated in the battery casing, the battery module including: a battery; a battery casing surrounding the power receiving module and the receiving coil disposed under the battery; And a heat radiating plate disposed between the receiving coil and the power receiving module and extending between the battery casing and the battery casing at both sides thereof and having a plurality of heat radiating arms in contact with the battery casing for transmitting heat of the receiving coils, .

Description

[0001] WIRELESS CHARGING STRUCTURE FOR PEN TYPE WIRELESS DEVICE [0002]

The present invention relates to a wireless charging structure of a wireless device, and more particularly, to a wireless charging structure of a wireless device capable of realizing stable charging by maintaining the temperature of a receiving coil at a low temperature during charging of a wireless device having a long length and a small cross- .

As the field of electronic technology has developed dramatically, the number of wireless devices used by wireless has been diversified and its spread is increasing. Wireless devices are typically used to charge batteries housed inside because the power supply lines are not connected.

Recently, wireless charging methods such as smart phones have been widely used. The magnetic induction type wireless charging method is a method in which a power receiving module is built in a wireless device and a power transmission module is built in the charger so that electric power is transmitted to the wireless device by magnetic induction to charge the battery.

To this end, a reception coil (RX coil) and a transmission coil (TX coil) are provided inside the wireless device and the charger, respectively. During the magnetic induction process for wireless charging, considerable heat is generated in the receiving coil.

When the temperature of the receiving coil is increased, the resistance is increased and a lot of heat is generated. When a lot of heat is generated, the charge is less and the heat loss is generated.

However, in the case of a pen type having a long length and a small cross-sectional area among the radio devices, the receiving coil is disposed on the floor surface for normal charging. At this time, the receiving coil is formed to have a small diameter according to the cross-sectional shape of the radio equipment. As a result, the heat is concentrated during the wireless charging process and a large amount of heat is generated.

The light cigarettes and the dental chargers used in dental equipment among radio devices shall meet the standards of electrical and electronic medical equipment that should not exceed 41 ℃ in contact with human skin.

However, when the above-described wireless charging of the magnetic induction type is applied to the conventional light curing machine or the dental charger, the temperature of the outer surface of the outer coil is raised to 50 to 60 ° C due to the heat generated in the receiving coil, there is a problem.

An object of the present invention is to provide a wireless charging structure of a wireless device capable of realizing stable wireless charging by rapidly discharging heat generated from a receiving coil while applying a wireless charging scheme.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention by those skilled in the art.

The object of the present invention can be achieved by a wireless charging structure of a wireless device. A wireless charging structure of a wireless device of the present invention includes: a wireless device having a battery and a power receiving module electrically connected to the battery; And a charger having a power transmission module for transmitting wireless power in a self-induction manner to the power receiving module, wherein the wireless device includes a function module and a heat transfer efficiency A battery casing formed of the high metal material; A battery housing accommodated in the battery casing and including the battery therein, the battery module including: the battery; a battery housing surrounding the power receiving module and the receiving coil disposed under the battery; And a heat radiating plate which is provided at one side of the receiving coil and extends between the battery casing and the battery housing and has at least one radiating arm for contacting the battery casing and transmitting heat of the receiving coil .

According to an embodiment of the present invention, the battery housing is formed with through-holes corresponding to the number of the heat-dissipating arms to expose the heat-dissipating arms to the outside.

According to an embodiment, a plurality of vent holes may be formed on an outer circumferential surface of the battery housing to dissipate the heat of the receiving coil to the outside.

According to one embodiment, the heat sink may be disposed between the power receiving module and the receiving coil, or may be disposed between the power receiving module and the battery, and the heat sink may have a multi-layer structure.

The wireless charging structure of a wireless device according to the present invention transmits heat generated from a receiving coil of a wireless device to a battery casing having a high heat transfer rate by a heat sink and a heat dissipating arm. The battery casing quickly transfers heat to the outside to prevent the temperature of the receiving coil from rising.

As an example, when a cylindrical lithium ion battery having a diameter of 18 mm and a capacity of 2400 mA / h was charged at 900 mA / h in a conventional manner, the temperature was increased to 20 ° C. However, in the wireless charging structure of the wireless device of the present invention, There is an effect of rising.

As a result, the charging efficiency of the battery is kept high, and stable wireless charging can be always performed.

In addition, since the temperature of the receiving coil and the temperature of the battery casing are kept low, not only electronic devices such as vibrating toothbrushes and razors used in daily life, but also medical devices such as a light curing machine and a root canal charger can satisfy the electric / Safe use may be possible.

1 is a perspective view showing a charging structure of a wireless device according to the present invention,
FIG. 2 is an exploded perspective view of the wireless device charging structure according to the present invention,
Fig. 3 is an exploded perspective view showing the configuration of the radio device,
Fig. 4 is an exploded perspective view showing the configuration of the charger,
FIG. 5 is a cross-sectional view illustrating a state in which a charging structure of a wireless device according to the present invention is filled. FIG.

For a better understanding of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that in the drawings, the same members are denoted by the same reference numerals. Detailed descriptions of well-known functions and constructions which may be unnecessarily obscured by the gist of the present invention are omitted.

Fig. 1 is a perspective view showing a charging state of the wireless device charging structure 1 according to the present invention. Fig. 2 is a state in which the wireless device 100 and the charger 200 of the wireless device charging structure 1 are separated Fig.

As shown in the figure, the wireless device charging structure 1 according to the present invention shows a wireless charging structure between the wireless device 100 and the charger 200. Here, the wireless device 100 applicable to the present invention includes various handpieces that are used wirelessly and have a narrow receive coil area, for example, a root canal charger used in dentistry, a light curing device, a razor used in daily life, Vibration toothbrushes, and the like.

The charging structure (1) for charging wireless devices according to the present invention quickly cuts out heat generated in a receiving coil having a small area when power is charged by a magnetic induction method to prevent the temperature of the wireless device (100) from rising Thereby improving the wireless charging efficiency.

Fig. 3 is an exploded perspective view showing the configuration of the radio device 100 in an exploded manner. As shown in the figure, the wireless device 100 includes a battery casing 110 for transferring heat generated from the receiving coil 147 to the outside, and a battery case 110 coupled to the battery casing 110 to perform a function of the wireless device 100 An input button 130 for operating the function module 120 and a battery module 140 accommodated in the battery casing 110 to supply power to the function module 120 do.

The battery casing 110 accommodates the function module 120 therein and allows the user to use the wireless device 100 while holding the function module 120 by hand. The battery casing 110 according to the present invention is formed of a metal having a good heat transfer efficiency, for example, aluminum, and quickly discharges heat generated in the receiving coil 147 for wireless charging. Thereby maintaining the temperature of the surface of the battery casing 110 at a low level so that it can be safely used even when it comes in contact with the lips of a patient like a dental medical instrument.

The battery casing 110 may be formed in various forms according to the purpose and function of the wireless device 100. The battery casing 110 is formed such that a button exposing hole 111 for exposing the input button 130 to the outside corresponds to the position and shape of the input button 130.

A head exposing hole 112 for exposing the head 123 of the function module 120 to the outside is formed at one end of the battery casing 110.

The function module 120 implements functions according to the purpose of the wireless device 100. The function module 120 may include a control board 121 and a head 123 for receiving power from the battery module 140 and controlling the operation of the input module 130 according to the input signal input through the input button 130.

In addition, the function module 120 may include various configurations capable of implementing functions corresponding to the types of the corresponding wireless devices. For example, when the wireless device is a dental light curing device, an LED for emitting light and a light guide tip may be provided. In addition, when the wireless device is a vibrating toothbrush, the functional module 120 may include a head to which the toothbrush is coupled, a vibrating means for vibrating the head, and the like, and may include a blade, a blade driving unit, and the like in the case of a razor.

The input button 130 is exposed to the outside of the battery casing 110, receives an input signal from a user, and transmits an input signal to the control board 121.

The battery module 140 charges electric power from the charger 200 in a magnetic induction manner and supplies power to the control board 121. The battery module 140 includes a battery 143 that is charged with power, a battery housing 141 that receives the battery 143, and a charger 200 that is electrically connected to the battery 143, A power receiving module 145 receiving the power transmitted from the charger 200 and transmitting the received power to the battery 143, and an inductive coupling method based on the electromagnetic induction phenomenon through the wireless power signal received from the charger 200 And a heat radiating plate 149 disposed between the receiving coil 147 and the power receiving module 145 for transmitting heat generated in the receiving coil 147 to the battery casing 110 do.

The battery housing 141 accommodates therein a battery 143, a power receiving module 145, a receiving coil 147 and a heat radiating plate 149 therein and is detachably coupled to the inside of the battery casing 110.

The battery housing 141 is provided at its lower portion with a step 141c having a larger diameter than the area where the battery 143 is accommodated and being contacted with and supported by the battery casing 110. 2, the upper portion of the battery housing 141 is inserted into the battery casing 110, and the lower region of the step 141c is exposed to the outside.

A plurality of female exposing holes 141a are formed in the upper portion of the step 141c to expose the heat dissipating arms 149a of the heat dissipating plate 149 to the outside of the battery housing 141, And a vent hole 141b is formed through the through hole.

The female exposing hole 141a exposes the heat dissipating arm 149a extending from the heat dissipating plate 149 to the outside of the battery housing 141 so that the heat dissipating arm 149a is brought into contact with the battery casing 110. [

The female exposures holes 141a are formed corresponding to the number and positions of the heat dissipation arms 149a.

A plurality of vent holes 141b are formed in the outer periphery of the battery housing 141 in the area where the power receiving module 145 and the receiving coil 147 are disposed so that heat generated in the receiving coil 147 is diverted into the atmosphere. do. The vent hole 141b is brought into contact with the atmosphere as shown in FIG. 2, so that heat generated in the receiving coil 147 and air in the air are heat-exchanged or heat is transferred to the atmosphere. As a result, part of the heat generated in the receiving coil 147 is directly discharged to the atmosphere, so that the temperature rise of the receiving coil 147 can be reduced.

The power receiving module 145 and the receiving coil 147 receive radio power from the charger 200 by a magnetic induction method. The shielding sheet 148 is coupled to the reception coil 147 to shield the magnetic field generated by the radio frequency signal generated in the reception coil 147. [

The heat radiating plate 149 is disposed between the shielding sheet 148 and the power receiving module 145 to transmit heat generated from the receiving coil 147 and the power receiving module 145 to the battery casing 110. The heat radiating plate 149 may be formed of a metal material having high heat transfer efficiency, for example, aluminum. The heat radiating plate 149 has an area corresponding to the area of the shielding sheet 148 and receives heat generated from the receiving coil 147 and the power receiving module 145 through the shielding sheet 148.

The heat radiating plate 149 may be disposed not only between the shielding sheet 148 and the power receiving module 145 but also between the battery 143 and the power receiving module 145. In some cases, . Further, the heat radiating plate 149 may be formed in a multi-layer structure including a two-layer structure.

At least one heat radiating arm 149a extending perpendicularly to the outer circumference of the heat radiating plate 149 is provided. The radiating arm 149a is exposed to the outside of the battery housing 141 through the female exposing hole 141a of the battery housing 141 and directly contacts the battery casing 110 as shown in FIG.

The heat generated from the receiving coil 147 is transmitted from the heat radiating plate 149 to the heat radiating arm 149a and the battery casing 110 when the wireless device 100 is connected to the charger 200. [ And can be rapidly transferred to the atmosphere.

Therefore, the temperature of the battery casing 110 held by the user can be prevented from rising, and the temperature at which the user contacts the body becomes lower than the electrical and electronic medical instrument standard of 41 占 폚.

Here, the heat radiating plate 149 according to an embodiment of the present invention has a pair of heat radiating arms 149a coupled to both sides thereof. However, this is merely an example, and the heat radiating arm 149a may be formed in three, four, or the like as the case may be.

The charger 200 is wirelessly coupled to the wireless device 100 to charge the wireless device 100. 4 is an exploded perspective view showing the configuration of the charging casing 210 in an exploded manner. The charger 200 includes a charging casing 210, a power transmission module 220 provided under the charging casing 210, and a base plate 230 covering an open lower portion of the charging casing 210 .

In the charging casing 210, a device insertion groove 211 corresponding to the shape of the wireless device 100 is formed. A power transmission module 220 is provided under the device insertion groove 211. The power transmission module 220 includes a transmission coil 221 (TX coil).

The charging casing 210 is connected to a power line (not shown) although not shown in the figure. A power supply line (not shown) is connected to the power transmission module 220.

The wireless charging process of the wireless device 100 according to the present invention having such a configuration will be described with reference to FIGS. 1 to 5. FIG.

As shown in FIG. 3, the wireless device 100 includes a battery module 140 inside the battery casing 110. The battery module 140 is inserted into the device insertion groove 211 of the charging casing 210 as shown in FIG.

Radio power is transmitted from the transmission coil 221 to the reception coil 147 in a magnetically inductive manner while the radio apparatus 100 is coupled to the charging casing 210 as shown in FIG. And the wireless power received by the power receiving module 145 is charged in the battery 143. [

At this time, the receiving coil 147 generates heat by magnetic induction. Particularly, since the cross-sectional area of the wireless device 100 is small, the diameter of the receiving coil 147 becomes narrow. Accordingly, a large amount of heat is generated in a narrow area.

The heat radiating plate 149 in contact with the shielding sheet 148 of the receiving coil 147 receives the heat generated from the receiving coil 147 and the radiating arm 149a is connected to the battery housing 141, So that the battery casing 110 is exposed. The heat transmitted to the heat radiating plate 149 is transmitted to the battery casing 110 through the radiating arm 149a and the battery casing 110 formed of an aluminum material having a high heat transfer rate transmits heat to the atmosphere, The temperature of the battery casing 110 itself is prevented from rising, and the temperature of the battery casing 110 itself is prevented from rising.

In addition, the vent hole 141b formed in the battery housing 141 discharges heat generated in the receiving coil 147 to the outside to prevent the temperature from rising.

Accordingly, the surface temperature variation of the battery casing 110 of the wireless device 100 according to the present invention is formed to be low in the range of 1 ° C to 5 ° C even during wireless charging, and can meet the electrical and electronic medical instrument standard.

The temperature of the receiving coil 147 is not raised by the heat dissipation process of the heat sink 149 and the vent hole 141b so that the resistance of the receiving coil 147 is kept constant and the charging efficiency can be kept constant.

As described above, the wireless charging structure of the wireless device according to the present invention transmits heat generated in the receiving coil of the wireless device to the battery casing having a high heat transfer rate by the heat sink and the heat dissipating arm. The battery casing quickly transfers heat to the outside to prevent the temperature of the receiving coil from rising.

As a result, the charging efficiency of the battery is kept high, and stable wireless charging can be always performed.

Further, since the temperature of the receiving coil and the temperature of the battery casing are kept low, not only electronic devices such as a vibrating toothbrush and a razor used in daily life, but also medical devices such as a light curing machine and a charger, It may become usable.

The embodiments of the wireless charging structure of the wireless device of the present invention described above are merely illustrative and those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. . Therefore, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

1: wireless device charging structure 100: wireless device
110: Battery casing 111: Button exposure ball
112: head exposure hole 120: function module
121: control board 123: head
130: input button 140: battery module
141: Battery housing 141a: Cancer exposure hole
141b: vent hole 141c: step
143: Battery 145: Power receiving module
147: Receiving coil 148: Shielding sheet
149: Heat sink 149a: Heat sink
200: Charger 210: Charging casing
211: device insertion groove 220: power transmission module
221: transfer coil 223: substrate
230: base plate

Claims (4)

In a wireless charging structure of a wireless device,
A wireless device having a battery and a power receiving module electrically connected to the battery;
And a charger having a power transmission module for transmitting wireless power to the power receiving module,
The wireless device comprising:
A battery casing formed of a metal material having high heat transfer efficiency and accommodating the function module;
And a battery module accommodated in the battery casing and incorporating the battery,
The battery module includes:
A battery housing enclosing the power receiving module and the receiving coil disposed under the battery;
And a heat radiating plate disposed on one side of the receiving coil and extending between the battery casing and the battery housing and having at least one radiating arm for contacting the battery casing and transmitting heat of the receiving coil,
Wherein the battery casing has a lower portion formed with a larger diameter than an area where the battery is received and is contacted with and supported by the battery casing, and the heat dissipating arm is exposed to the outer circumference of the upper portion of the step, And a vent hole for radiating the heat of the receiving coil to the outside is formed at the outer periphery of a lower portion of the step. Charging structure.
delete delete The method according to claim 1,
Wherein the heat sink is disposed between the power receiving module and the receiving coil or between the power receiving module and the battery and is formed in a multi-layered structure.

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