KR20130106706A - Apparatus for wireless charger capable of searching receive coil and method for controlling the same - Google Patents

Abstract

PURPOSE: A wireless charging device capable of searching for a power reception coil and a control method thereof are provided to locate a power reception coil which is placed on wireless charging pad with a power transmission coil array, thereby efficiently charging a battery device. CONSTITUTION: A wireless charging pad (200) includes a power transmission coil array (220) in which a plurality of power transmission coils (210) are arranged. A wireless charging module (300) locates a power reception coil which is arbitrarily located on the wireless charging pad. The wireless charging module operates a power transmission coil corresponding to the detected location only and wirelessly transmits charging power to a battery device. The wireless charging module includes a power supply module (310), a high frequency power generation unit (320), a coil operation circuit unit (330), a charging power detection unit (340) and a control unit (350). The high frequency power generation unit produces a high frequency alternating current required for wireless charging from power supplied by the power supply unit. [Reference numerals] (310) Power supply unit; (320) High frequency power generation unit; (330) Coil operation circuit unit; (340) Charging power detection unit; (350) Control unit

Description

Apparatus for wireless charger capable of searching receive coil and Method for controlling the same}

The present invention relates to a contactless charging device using inductive coupling, and more particularly, to search for the position of a power receiving coil located on a contactless charging pad having a feeding coil array in which a plurality of feeding coils are arranged. A contactless charging device capable of locating a power receiving coil to enable contactless charging and a control method thereof.

In general, portable electronic devices such as mobile communication terminals and PDAs are equipped with a battery having a rechargeable secondary battery to provide power. In order to charge the secondary battery, a separate charging device for supplying the portable commercial electronic device with a suitable commercial power source is required. Typically, the charging device and the battery are each provided with a separate contact terminal on the outside, thereby electrically connecting the charging device and the battery by connecting the two contact terminals to each other.

However, if the contact terminal protrudes to the outside as described above, there is a problem that the appearance is not good and the contact terminal is contaminated with the foreign substance and the contact state is easily deteriorated. Further, when a short circuit occurs to the battery due to carelessness of the user or exposure to moisture, the charging energy can be easily lost.

In order to solve the problem of the contact charging method, the non-contact method of charging the battery using an inductive coupling between the charging device having a primary coil (feed coil) and the battery having a secondary coil (hydraulic coil). A contactless charging system has been proposed. As related technologies, Republic of Korea Patent Publication No. 2002-57468, Republic of Korea Patent Publication No. 2002-57469, Republic of Korea Patent Publication No. 428,713, Republic of Korea Patent Publication No. 2002-35242, United States Patent Publication No. 2003 / 0,210,106 And the non-contact charging system disclosed in the call.

However, the above-described conventional contactless charging system has a disadvantage in that the charging efficiency depends on the positional relationship between the primary coil and the secondary coil. That is, if there is a positional offset between the primary coil and the secondary coil, the charging efficiency is very low compared to the contact point charging system because the induced electromotive force is not sufficiently induced in the secondary coil. Therefore, the user should try to put the portable electronic device or battery pack with the secondary coil in the optimum position on the charging matrix.

In order to solve this problem, efforts have been made to convert the arrangement pattern of the primary coil to ensure high charging efficiency regardless of the position or direction of the secondary coil.

Republic of Korea Patent No. 524,254 (hereinafter abbreviated as 254 'patent) has a certain pattern on a flat plate core, which has a plurality of small cores made of cobalt-based or ferrite on a wireless charging pad (primary charging matrix). Disclosed is a contactless charging system in which a core block having a coil is disposed.

However, in order to compensate for the positional misalignment between the primary coil and the secondary coil as in the 254 'patent, it is necessary to arrange multiple coils alternately or in parallel on the same plane of the charging matrix when using a single coil. Compared to the energy waste is excessive.

The present invention has been made to solve the problems of the prior art as described above, in the contactless charging device using an inductive coupling of the power supply coil array and the power receiving coil array of a plurality of feed coils, the position of the power receiver coil arbitrarily located And a contactless charging device capable of searching the position of the faucet coil which can be contactlessly charged with optimum efficiency while minimizing energy waste by configuring the contactless charging through the feed coil of the searched position. And a control method thereof.

A contactless charging device according to the present invention for achieving the above technical problem, a contactless including a power supply coil array in which a plurality of feed coils are magnetically coupled to the power receiving coil embedded in the battery device to induce charging power A charging pad; And preliminarily driving each of the feed coils of the feed coil array, and monitor charging power induced according to the preliminary driving of each feed coil to search for a position of the power receiving coil arbitrarily positioned on the contactless charging pad. And a contactless charging module configured to drive only a power supply coil corresponding to a predetermined position to deliver charging power to the battery device in a contactless manner.

Preferably, the contactless charging module, the power supply for receiving a commercial AC power to convert the DC power supply; A high frequency power generation unit generating the power supplied from the power supply unit as a high frequency AC current required for contactless charging; A coil driving circuit unit selectively applying high frequency AC current generated from the high frequency power generator to each of the feed coils of the feed coil array; A charging power detector configured to detect and output an intensity of charging power induced by driving each of the feeding coils of the feeding coil array; And preliminarily driving the respective feeding coils of the feeding coil array by controlling the coil driving circuit unit, and monitoring the strength of the charging power of each feeding coil detected by the charging power detector to randomly locate the contactless charging pad. And a control unit for searching the position of the power receiving coil and driving only the power feeding coil corresponding to the found position.

Preferably, the controller of the contactless charging module controls the coil driving circuit to pre-drive each feeding coil of the feeding coil array, and the intensity of the charging power of each feeding coil detected by the charging power detector is at a predetermined level. When exceeding, it searches to locate the said receiving coil in the position of the said power supply coil.

Preferably, the controller of the contactless charging module controls the coil driving circuit to pre-drive each feeding coil of the feeding coil array, and compares the strength of the charging power of each feeding coil detected by the charging power detector with each other. The power receiving coil is located at the position of the power feeding coil having the maximum charging power.

Preferably, the control unit of the contactless charging module, for each of the feed coils of the feed coil array grouped into a center feed coil and peripheral feed coils adjacent to the center feed coil divided into at least one feed coil block to control do.

Preferably, the control unit of the contactless charging module, by selecting any of the power supply coil block from the power supply coil block, and controls the coil drive circuit unit to pre-drive the center feed coil and peripheral feed coils of the feed coil block sequentially When the charging power of the center coil is the maximum value, the receiving coil is located at the position of the center feeding coil by comparing the strengths of the charging power of the center feeding coil and the surrounding feeding coils detected by the charging power detector.

Preferably, the control unit of the contactless charging module, by selecting any of the power supply coil block from the power supply coil block, and controls the coil drive circuit unit to pre-drive the center feed coil and peripheral feed coils of the feed coil block sequentially When there is a value greater than the value of the center feed coil among the surrounding feed coils by comparing the strengths of the charging powers of the center feed coils and the surrounding feed coils detected by the charging power detector, charging in the corresponding feed coil block The feed coil with the maximum power strength is redirected to a new center feed coil, and the peripheral feed coils adjacent to the redirected center feed coil form a virtual feed coil block composed of the new peripheral feed coils.

Preferably, the controller of the contactless charging module continues until the charging power of the center feeding coil or the redesignated center feeding coil reaches a maximum value.

Preferably, the controller of the contactless charging module is configured to pre-drive all of the center feed coils of the feed coil blocks and compare the intensity of the charge power detected by the charge power detector to display a corresponding feed of the center feed coil having a maximum value. The search for the faucet coil in the coil block begins.

Preferably, the controller of the contactless charging module is configured to pre-drive all of the center feed coils of the feed coil blocks, and compare the intensity of the charge power detected by the charge power detector to display a corresponding level or more of the center feed coil. The search for the power receiving coil in the feed coil block starts.

Preferably, the control unit of the contactless charging module, by selecting any of the power supply coil block from the power supply coil block, and controls the coil drive circuit unit to pre-drive the center feed coil and peripheral feed coils of the feed coil block sequentially When the strength of the charging power of all the feeding coils in the corresponding feeding coil block is less than or equal to a predetermined level by comparing the strength of the charging power of the center feeding coil and the surrounding feeding coils detected by the charging power detecting unit, a new feeding coil block is determined. It is selected as a feed coil block for searching for a receiving coil.

Preferably, the feed coil array includes a plurality of feed coils arranged in a staggered manner in a zigzag form.

Preferably, the feed coil array has a plurality of feed coils arranged in a matrix form.

A contactless charging control method according to an aspect of the present invention for achieving the above technical problem, a feed coil array in which a plurality of feed coils are magnetically coupled to the power receiving coil embedded in the battery device to induce charging power; A contactless charging control method using a contactless charging pad comprising: (a) pre-driving each of the feeding coils of the feeding coil array; (b) searching the position of the power receiving coil arbitrarily located on the contactless charging pad by monitoring the intensity of the charging power induced by the preliminary driving of each feeding coil of the feeding coil array; And (c) driving only a power supply coil corresponding to a position where the power receiving coil is found to supply charging power to the battery device in a contactless manner.

Preferably, in the step (b), when the detected intensity of the charging power of each of the power supply coils exceeds a predetermined level, the power receiver coil is located at the position of the power supply coil.

Preferably, the step (b) compares the strengths of the charging power of each of the detected power feeding coils with each other and searches for the position of the power receiving coil at the position of the power feeding coil having the maximum charging power.

In accordance with another aspect of the present invention, there is provided a contactless charging control method comprising: a power supply coil array including a plurality of power supply coils magnetically coupled to a power receiving coil embedded in a battery device to induce charging power; A contactless charging control method using a contactless charging pad comprising: (a) at least one grouping each of the feed coils of the feed coil array into a center feed coil and peripheral feed coils adjacent to the center feed coil; Dividing the above power feeding coil block and sequentially driving the center feeding coil and the surrounding feeding coil of the feeding coil block for each feeding coil block; (b) monitoring whether charging power is detected as the center feed coil and the surrounding feed coils of the feed coil block are sequentially preliminarily driven; (c) When the charging power is detected in the feeding coil of the feeding coil block, the strength of the charging power of the center feeding coil and the surrounding feeding coils of the feeding coil block is compared with each other and the charging power is at the position of the feeding coil having the maximum value. Searching for where the receiving coil is located; And (d) driving only a power supply coil corresponding to a position where the power receiving coil is found to supply charging power to the battery device in a contactless manner.

Preferably, in the step (c), when the power supply coil having the maximum charging power is the peripheral power supply coil by comparing the strength of the charging power of the center power supply coil and the peripheral power supply coils of the power supply coil block with each other, the charging (c1) Reassigning a peripheral feed coil having a maximum power to a center feed coil; (c2) pre-driving peripheral feed coils of the redirected center feed coil; And (c3) comparing the strength of the charging power of the peripheral power supply coil detected with the preliminary driving of the peripheral power supply coils with the intensity of the recharging power of the re-designated center power supply coil to the position of the power supply coil having the maximum charging power. And searching for where the power receiving coil is located.

Preferably, the steps (c1) to (c3) continue until the charging power of the center feed coil or the redesignated center feed coil reaches a maximum value.

According to the present invention, the contactless charging pad is configured as a feeder coil array in which a plurality of feeder coils are arranged, thereby searching for a position of a power receiving coil arbitrarily positioned on the contactless charging pad and contactless through a feeder coil of the corresponding position. As charging progresses, it is possible to provide a contactless charging device capable of contactless charging with optimum efficiency and minimizing energy waste. In addition, it is possible to simultaneously contactless charge a plurality of portable electronic devices through a feed coil array in which a plurality of feed coils are arranged.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and, together with the description, And shall not be interpreted.
1 is a schematic use state diagram of a contactless charging device according to the present invention.
2 is a schematic circuit diagram of a contactless charging device according to the present invention.
3 is a diagram illustrating an identification method for a power feeding coil array according to the present invention.
4 is a flowchart illustrating a procedure of a contactless charging method according to a first embodiment of the present invention.
5 is a flowchart illustrating a procedure of a contactless charging method according to a second embodiment of the present invention.
6 is a flowchart illustrating a procedure of a contactless charging method according to a third embodiment of the present invention.
7 is a flowchart illustrating a procedure of a contactless charging method according to a fourth embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

1 is a schematic use state diagram of a contactless charging device according to the present invention, FIG. 2 is a schematic circuit diagram of a contactless charging device according to the present invention, and FIG. 3 is an identification of a feed coil array according to the present invention. Figure is for explaining the scheme.

1 and 2, the contactless charging device 100 according to the present invention is a plurality of power supply coils magnetically coupled to the power receiving coil 410 embedded in the battery device 400 to induce charging power ( The contactless charging pad 200 including the feed coil array 220 in which the 210 is arranged and the feed coils 210 of the feed coil array 220 are preliminarily driven, and each feed coil 210 is provided. By monitoring the charging power induced according to the preliminary driving of the search for the position of the faucet coil 410 arbitrarily located on the contactless charging pad 200, by driving only the feed coil 210 corresponding to the searched position It includes a contactless charging module 300 for transmitting charging power to the battery device 400 in a contactless manner.

The contactless charging pad 200 includes a feeding coil array 220 in which a plurality of feeding coils 210 that individually generate a magnetic field are arranged. Each power supply coil 210 is made of a coil repeatedly wound by a predetermined number, and is embedded at a point spaced a predetermined distance from an upper surface of the contactless charging pad 200. The feed coil 210 may be formed in a circular shape as shown in the drawing, but the present invention is not limited thereto, and may be configured in various shapes such as an ellipse and a polygon.

Since the power supply coil array 220 is composed of a plurality of power supply coils 210, as compared with a conventional single coil, it is easy to achieve position matching with the power supply coil 410. That is, even when the battery device 400 positioned on the contactless charging pad 200 is inclined, any one of the plurality of power feeding coils 210 may be positioned in the power receiving coil 410, thereby causing positional displacement between coils. offset) does not occur.

Through the power supply coil array 220, the user may increase the convenience of use because the user does not need to consciously consider the positional relationship between the power receiver coil 410 and the power supply coil 210 of the battery device 400. . In addition, in the feed coil array 220 of the present invention, a plurality of feed coils 210 may be alternately arranged in a zig-zag form as shown in the drawing, but the present invention is not limited thereto. It is also possible to arrange a plurality of coils in a matrix form.

As shown in FIG. 2, the contactless charging module 300 may include a power supply unit 310, a high frequency power generation unit 320, a coil driving circuit unit 330, a charging power detection unit 340, and a control unit 350. Include.

The power supply unit 310 receives the commercial AC power (60Hz, 220V) is converted into a DC power supply and supplied to the high frequency power generator 320.

The high frequency power generating unit 320 converts the power supplied from the power supply unit 310 into high frequency AC current required for contactless charging, and generates the generated high frequency AC current through the coil driving circuit unit 330. The power supply may be transferred to each power supply coil 210 of the power supply coil array 220 so that charging power may be induced when each power supply coil 210 is magnetically coupled to the power reception coil 410. Through such wireless transfer of the induced charging power, it is possible to transfer the charging power to the battery device 400 without contact.

The coil driving circuit unit 330 selectively applies the high frequency AC current generated from the high frequency power generator 320 to each of the power supply coils 210 of the power supply coil array 220. That is, the coil driving circuit unit 330 receives the selection command from the control unit 350 and applies the high frequency AC current to the power supply coil 210 indicated by the selection command. For example, the coil driving circuit unit 330 is a kind of switching circuit located between the high frequency power generator 320 and the power supply coil array 220, and the power supply coil 210 and the high frequency power selected by the control unit 350. It is electrically connected between the generator 320.

The charging power detector 340 is supplied with a high frequency alternating current to each of the feed coils 210 of the feed coil array 220, and the feed coil 210 and the power receiver coil when the power receiver coil 410 is positioned at the corresponding position. 410 is magnetically coupled to perform a function of detecting and outputting the intensity of the charging power induced in the feeding coil 210.

The control unit 350 is a kind of microprocessor that controls the overall components of the contactless charging module 300, and in particular, controls the coil driving circuit unit 330 to feed each of the feed coils 210 of the feed coil array 220. Preliminarily driving them, and monitoring the strength of the charging power of each of the power supply coils 210 detected by the charging power detection unit 340 to search for positions of the power receiving coils randomly located on the contactless charging pad 200. The process of driving only the power supply coil 210 corresponding to the found position controls the contactless charging process to the battery device 400.

The control unit 350 searches for a faucet coil search mode for searching for a position of the faucet coil 410 arbitrarily located on the contactless charging pad 200, and the feed coil 210 corresponding to the searched position of the faucet coil 410. Through) to control the respective components of the contactless charging module 300 by dividing into a charging mode for delivering charging power to the battery device 400 in a contactless manner.

In the power receiving coil search mode, the control unit 350 controls the coil driving circuit unit 330 to pre-drive each of the power supply coils 210 of the power supply coil array 220 and is detected by the charging power detection unit 340. The intensity of the charging power of each of the feeding coils 210 is monitored to search for the position of the receiving coil 410 arbitrarily located on the contactless charging pad 200. Here, the preliminary driving of the power feeding coil is an operation for checking whether there is a power receiving coil 410 magnetically coupled with the power feeding coil 210 by preliminarily applying a high frequency AC current to the power feeding coil 210. When the power receiving coil 410 is positioned around the power supply coil 210, the power supply coil 210 to which the high frequency alternating current is applied is magnetically coupled with the power receiving coil 410 to induce charging power. do. In this way, by monitoring the strength of the charging power induced by the power supply coil 210, the position of the power receiving coil 410 may be searched in the power receiving coil search mode.

For example, the control unit 350 controls the coil driving circuit unit 330 to sequentially feed the coils 210 according to the order of the coil numbers # 1 to # 48 of the respective feeding coils 210 shown in FIG. 2. The preliminary driving of the power supply coil 210 detects the strength of the charging power induced by the preliminary driving of the power supply coils 210 through the charging power detection unit 340, and detects the detected power value of the power supply coils 210. It is temporarily stored in the internal memory (not shown) together with the coil numbers # 1 to # 48. When the preliminary driving and the detection of the charging power strength of all the feeding coils 210 of the feeding coil array 220 are completed, the positions of the receiving coils 410 are searched by comparing the charging power strengths of the feeding coils 210. do.

At this time, the position search of the power receiving coil 410 selects a case where the intensity of the charging power of each of the power supply coils 210 detected by the charging power detector 340 exceeds a predetermined level, and the charging exceeds the predetermined level. The power receiving coil 410 is located at the position of the power feeding coil 210 having electric power, or the relative strengths of the charging powers of the power feeding coils 210 detected by the charging power detecting unit 340 are compared with each other. The power receiving coil 410 is located at the position of the power feeding coil 210 having a large charging power, or the strengths of the charging powers of the power feeding coils 210 detected by the charging power detecting unit 340 are mutually determined. In comparison, the power receiving coil 410 may be located at the position of the power feeding coil 210 having the maximum charging power. Such a search method may use a suitable method according to the arrangement size of the feed coil array 220, that is, the number or capacity of the configured feed coils 210.

As another example, the control unit 350 controls the coil driving circuit unit 330 to feed the power supply coils 210 in any order from the coil numbers # 1 to # 48 of the power supply coils 210 shown in FIG. 2. While preliminary driving, while checking whether the charging power induced by the preliminary driving of each of the power supply coils 210 is detected through the charging power detection unit 340, when the charging power is detected, the power supply coil for the first time the charging power is detected 210 is designated as the center feed coil 210, and the charging power intensity value of the center feed coil 210 is temporarily stored in the internal memory (not shown) together with the coil numbers # 1 to # 48. In addition, only preliminary driving is performed on only the peripheral power supply coils 210 adjacent to the central power supply coil 210, and the strength of the charging power is detected to detect the strength of the charging power and the peripheral power supply coil 210 of the central power supply coil 210. ) To determine the power supply coil 210 of the maximum charging power by comparing the charging power strength of each other, and when the power supply coil 210 of the maximum value is the center feed coil 210 of the previous power supply coil 210 When the power receiving coil 410 is located at a position and the feeding coil 210 having the maximum value is not the center feeding coil 210, the feeding coil 210 having the maximum value is again placed at the center feeding coil ( And re-assigned to 210). This process may be repeatedly performed until the center feed coil 210 becomes a feed coil having a maximum value.

Meanwhile, in the above-described embodiment, it has been described that the control unit 350 controls the feed coils 210 of the feed coil array 220 by controlling the coil numbers # 1 to # 48 shown in FIG. 2. . However, the present invention is not limited thereto, and the control unit 350 may group and control the feed coils 210 of the feed coil array 220 into a predetermined number to divide and control at least one feed coil block. Can be. For example, as shown in FIG. 3, the control unit 350 groups a total of 48 feed coils 210 into five feed coil blocks B, and each grouped feed coil block B is a center feed coil. The coil numbers B1- # 0, B2- # 0, B3- # 0, B4- # 0, and B5- # 0 of 210 and the peripheral feed coils 210 adjacent to the center feed coils 210; It can be controlled by classifying coil number (B1- # 1 ~ # 6, B2- # 1 ~ # 6, B3- # 1 ~ # 6, B4- # 1 ~ # 6, B5- # 1 ~ # 6). .

In the power receiving coil search mode in this embodiment, as another example, the control unit 350 controls the coil drive circuit unit 330 to block the number B1 to B5 shown in FIG. While preliminarily driving the power supply coil block B in sequence, the power consumption detected by the preliminary driving of each power supply coil block B is detected through the charge power detection unit 340, and the detected charge is detected. The strength value of the power is temporarily stored in the internal memory along with the block numbers B1 to B5 of each feeding coil block B. FIG.

At this time, the preliminary driving of each feed coil block (B) pre-drives all configured feed coils at the same time, or any one selected from the configured feed coils, for example, the coil number (B1- # 0) of the center feed coil in FIG. , B2- # 0, B3- # 0, B4- # 0, and B5- # 0) may be representatively pre-driven. In such a case, the position of the power receiving coil 410 may be roughly estimated by searching for the representative feeding coil 210 or the feeding coils 210 of the grouped area even without searching all the feeding coils 210. Will be.

Then, when the preliminary driving and the detection of the charging power intensity of all the power supply coil blocks B are completed, the power supply coils 210 configured only for the power supply coil block B from which the charging power is detected are preliminarily driven, The power receiving coil 410 is positioned at the position of the feeding coil 210 having the maximum charging power by detecting the strength and comparing the charging power intensities of the respective feeding coils 210 of the feeding coil block B with each other. Search.

As another example, the control unit 350 controls the coil driving circuit unit 330 to supply the power supply coil block B in any order among the block numbers B1 to B5 shown in FIG. 3 for each power supply coil block. While preliminarily driving the configured feed coils 210, whether or not the charging power induced by the preliminary driving of the feed coils 210 configured for each feed coil block B is detected through the charge power detector 340. When the power supply coil block in which the charging power is detected is checked, the strength of the charging power of each of the power supply coils 210 of the power supply coil block B is compared to the position of the power supply coil 210 having the maximum charging power. The power receiver coil 410 is located.

On the other hand, when the feed coil 210, which is the maximum value, is located on the outer side of the feed coil block B, while charging the surrounding feed coils 210 of the feed coil 210 additionally, while charging the surrounding feed coil 210. The power supply coil 210 is reconfirmed in comparison with the power intensity, and the power supply coil 210 is repeatedly performed until the maximum value of the power supply coil 210 is located at the center of the power supply coil block B. The location of 410 may be searchable.

Next, an embodiment of a search method of a power receiving coil in a contactless charging method through a contactless charging device according to the present invention will be described. For convenience of description, the contactless charging device 100 of the present embodiment has a coil array structure (a form in which 48 feed coils are arranged in a zigzag structure) as shown in FIG. Assume that the battery device 400 in which the power receiving coil 410 is embedded is placed on the contactless charging pad 200 at an arbitrary position.

4 and 5 are flowcharts illustrating the procedures of the contactless charging method according to the first and second embodiments of the present invention.

Referring to FIG. 4, in the method of searching for a power receiving coil in the contactless charging method according to the first embodiment of the present invention, first, in step S11, an external power source such as an AC power supply is connected to the contactless charging module 300. When applied, the control unit 350 is driven to enter a faucet coil search mode for searching for a position of the faucet coil 410 arbitrarily located on the contactless charging pad 200.

In step S12, the control unit 350 controls the coil driving circuit unit 330 to pre-drive each feeding coil 210. That is, the high frequency power is generated by controlling the coil driving circuit unit 330 to the nth feeding coil 210 according to the order of the coil numbers # 1 to # 48 of each feeding coil 210 shown in FIG. 2. The high frequency AC current generated by the unit 320 is applied.

In step S13, the control unit 350 detects the intensity of the charging power induced by the preliminary driving of the n-th power supply coil 210 through the charging power detection unit 340, and detects the detected charging power intensity value. Temporarily stored in the internal memory (not shown) together with the coil numbers (# 1 ~ # 48) of the n-th power supply coil (210).

In step S14, by checking whether the coil number of the nth power supply coil 210 is # 48, the preliminary driving of each power supply coil 210 is sequentially performed in the order of the coil numbers # 1 to # 48. As a step of determining whether it is completed, if the coil number of the nth power supply coil 210 is not # 48, the process proceeds to step S15 to perform the process in a state in which the coil number index n of the power supply coil is increased by one ( If the coil number of the n-th power supply coil 210 is # 48, it transfers to step S16.

In operation S15, the controller 350 determines that preliminary driving and detection of charging power of all of the power supply coils 210 have been completed, and reads the strength of the charge power of each power supply coil 210 from the internal memory to supply each power supply. The strength of the charging power of the coil 210 is compared. That is, in step S15, the control unit 350 checks whether the charging power is detected in each of the feeding coils 210, and if the charging power is detected in the feeding coil 210, the charging power is determined. The strengths of the charging power of the detected feed coils 210 are compared with each other.

In step S16, the controller 350 searches for the position of the power receiving coil from a result of comparing the strength of the charging power of each of the power feeding coils 210. For example, the controller 250 selects a case where the strength of the charging power of the power supply coil 210 exceeds a predetermined level and determines that the power exceeds the predetermined level, based on a comparison result of the charging power intensities of the power supply coils 210. The power receiving coil 410 is located at the position of the power feeding coil 210 having power, or the power of the power feeding coil 210 having a relatively large charging power compared to the power feeding coil 210 having a different intensity of charging power. The power receiving coil 410 may be located at a location, or the power receiving coil 410 may be located at a location of a power feeding coil 210 having a maximum charging power. Such a search method may be used by determining a suitable method according to the arrangement size of the power supply coil array 220, that is, the number or capacity of the configured power supply coil 210.

Referring to FIG. 5, in the method of searching for a power receiving coil in the contactless charging method according to the second embodiment of the present invention, first, in step S21, an external power source such as an AC power supply is connected to the contactless charging module 300. When applied, the control unit 350 is driven to enter a faucet coil search mode for searching for a position of the faucet coil 410 arbitrarily located on the contactless charging pad 200.

In step S22, the control unit 350 controls the coil driving circuit unit 330 to pre-drive each feeding coil 210. That is, the n-th power supply coil 210 is preliminarily driven in any order among coil numbers # 1 to # 48 of the power supply coils 210 shown in FIG. 2.

In step S23, the controller 350 detects the charging power induced by the n-th power supply coil 210 through preliminary driving through the charging power detector 340.

In step S24, it is checked whether the power of the charging power is detected in the nth power supply coil 210. If no charging power is detected, the process proceeds to step S25 to increase the coil number index n of the power supply coil by 1. In the state, the process proceeds to step S22, and when the intensity of the charging power is detected in the n-th power supply coil 210, the process proceeds to step S26.

In step S26, the control unit 350 recognizes that the n th power supply coil 210 is the power supply coil 210 in which the charging power is first detected, and designates the power supply coil 210 as the center power supply coil 210. Then, the charging power intensity value of the central power supply coil 210 is temporarily stored in an internal memory (not shown) together with the coil numbers # 1 to # 48 of the nth power supply coil 210.

In operation S27, the controller 350 sequentially drives only the peripheral power supply coils 210 adjacent to the central power supply coil 210. That is, only the power supply coils 210 in which the preliminary driving and charging power detection has not been performed around the center power supply coils 210 are selected, and the selected power supply coils 210 are individually and sequentially disposed in the coil drive circuit unit 330. By controlling, the high frequency AC current generated by the high frequency power generator 320 is applied.

In step S28, the control unit 350 detects the intensity of the charging power induced by each of the peripheral power supply coils 210 preliminarily driven through the charging power detector 340, and detects the detected charging power intensity value. Temporarily stored in the internal memory together with the coil numbers (# 1 ~ # 48) of the power supply coil 210.

In operation S29, the control unit 350 compares the charging power strength of the central power supply coil 210 with the charging power strength of the peripheral power supply coils 210 to compare the power supply coils 210 having the maximum charging power. Check it.

In step S30, it is checked whether the intensity of the charging power of the center feeding coil 210 is the maximum value, and if the feeding coil 210 having the maximum charging power is not the center feeding coil 210, step S31. The process proceeds to step S27 in a state in which the power supply coil 210 having the maximum value is reassigned to the center power supply coil 210 and the power supply coil 210 having the maximum charging power is the center power supply coil. If 210, the process proceeds to step S32.

In step S32, the control unit 350 searches for the power receiving coil 410 to be positioned at the position of the center feeding coil 210.

Meanwhile, in the above-described first and second embodiments, the control unit 350 divides each of the feeding coils 210 of the feeding coil array 220 by the coil numbers # 1 to # 48 shown in FIG. 2. It has been described as controlling. However, the present invention is not limited thereto, and the control unit 350 may group and control each of the power supply coils 210 of the power supply coil array 220 into at least one power supply coil block. have. For example, as shown in FIG. 3, the control unit 350 groups a total of 48 feed coils 210 into five feed coil blocks B, and each grouped feed coil block B is a center feed coil. The coil numbers B1- # 0, B2- # 0, B3- # 0, B4- # 0, and B5- # 0 of 210 and the peripheral feed coils 210 adjacent to the center feed coils 210; It can be controlled by classifying coil number (B1- # 1 ~ # 6, B2- # 1 ~ # 6, B3- # 1 ~ # 6, B4- # 1 ~ # 6, B5- # 1 ~ # 6). . Hereinafter, an embodiment of a search method of a power receiving coil in a contactless charging method through a contactless charging device under such conditions will be described.

6 and 7 are flowcharts illustrating the procedures of the contactless charging method according to the third and fourth embodiments of the present invention.

Referring to FIG. 6, in the method of searching for a power receiving coil in the contactless charging method according to the third embodiment of the present invention, first, in step S41, an external power source such as an AC power supply is connected to the contactless charging module 300. When applied, the control unit 350 is driven to enter a faucet coil search mode for searching for a position of the faucet coil 410 arbitrarily located on the contactless charging pad 200.

In step S42, the controller 350 controls the coil driving circuit unit 330 to pre-drive the power feeding coil block B. FIG. That is, the high frequency power is generated by controlling the coil driving circuit unit 330 to the Mth feeding coil block B according to the order of the block numbers B1 to B5 of the feeding coil blocks B shown in FIG. 3. The high frequency AC current generated by the unit 320 is applied. At this time, in step S42, the control unit 350 pre-drives all the feed coils of each feed coil block B at the same time, or any one selected from the configured feed coils, for example, the center feed coil shown in FIG. Only the coil numbers B1-# 0, B2- # 0, B3- # 0, B4- # 0, and B5- # 0 of the 210 may be preliminarily driven. In this case, unlike in the above-described first and second embodiments, even if not all of the power supply coils 210 are searched, only through the representative power supply coil 210 or the power supply coils 210 of the grouped area is searched. The position of the power receiving coil 410 can be estimated.

In step S43, the controller 350 detects the intensity of charging power induced by the preliminary driving of the M-th feeding coil block B through the charging power detector 340, and detects the strength of the detected charging power. The value is temporarily stored in the internal memory together with the block numbers B1 to B5 of each feeding coil block B. FIG.

In step S44, all the preliminary drivings are completed in order according to the order of the block numbers B1 to B5 by checking whether the block number of the Mth feeding coil block B is B5. If the block number of the M-th power supply coil block B is not B5, the process proceeds to step S45 where the block number index M of the power supply coil block B is increased by one. Is shifted to step S42, and if the block number of the Mth power supply coil block B is B5, the process proceeds to step S46.

In step S46, the controller 350 determines that preliminary driving and charging power detection of all the power supply coil blocks B are completed, and determines whether the power supply coil blocks B detect the charging power.

In step S47, the presence or absence of the power receiving coil 410 is checked from the result of detecting the charging power of each power supply coil block B. FIG. That is, if no charging power is detected in all the feeding coil blocks B, it is determined that the receiving coil 410 is not located on the contactless charging pad 200, and the process is shifted to before step S42, and the charging power is performed. The process proceeds to step S48 only when the power supply coil block B to be detected exists.

In operation S48, the controller 350 sequentially drives each of the power supply coils 210 configured in the power supply coil block B only for the power supply coil block B in which charging power is detected. That is, the coil driving circuit unit 330 is controlled to apply the high frequency AC current generated by the high frequency power generator 320 only to the feed coil 210 configured in the feed coil block B in which the charging power is detected.

In step S49, the control unit 350 calculates the intensity of the charging power induced by the preliminary driving of each of the power supply coils 210 configured in the power supply coil block B in which the charge power is detected. Detects through and temporarily stores the detected charge power strength value in the internal memory along with the coil number.

In step S50, the controller 350 compares the strength of the charging power of each of the feeding coils 210 configured in the feeding coil block B in which the charging power is detected. That is, in step S50, the controller 350 determines whether the charging power is detected in each of the feeding coils 210 configured in the feeding coil block B in which the charging power is detected, and if the charging power is detected, the feeding coil 210. In operation, it is determined whether the charging power is detected, and the strength of the charging power of the feeding coils 210 from which the charging power is detected is compared with each other.

In step S51, the controller 350 searches for the position of the power receiving coil from the result of comparing the intensity of the charging power of each of the power supply coils 210 configured in the power supply coil block B from which the full power is detected. That is, the power receiving coil 410 is located at the position of the feeding coil 210 having the maximum charging power among the feeding coils 210 of the feeding coil block B.

Referring to FIG. 7, in the method of searching for a power receiving coil in the contactless charging method according to the fourth embodiment of the present invention, first, an external power source such as an AC power source is connected to the contactless charging module 300 in step S61. When applied, the control unit 350 is driven to enter a faucet coil search mode for searching for a position of the faucet coil 410 arbitrarily located on the contactless charging pad 200.

In step S62, the control unit 350 arbitrarily M of the block numbers B1 to B5 of each power supply coil block B shown in FIG. 3 as a preliminary operation for preliminary driving for each power supply coil block B. FIG. The first power supply coil block B is selected. At this time, the selection of the power supply coil block B, it is preferable to select the power supply coil block (B) corresponding to the point where the receiving coil 410 is relatively located on the contactless charging pad 200.

In step S63, the controller 350 preliminarily drives the feeding coil 210 configured in the M-th feeding coil block B. FIG. That is, coil numbers B1- # 0, B2- # 0, B3- # 0, B4- # 0, and B5- # 0 of the center feed coil 210 in each feed coil block B shown in FIG. Priority is given to coil numbers (B1- # 1 to # 6, B2- # 1 to # 6, B3- # 1 to # 6, B4- # 1 to # 6, and B5- # 1 to coils around the peripheral feed coil 210). # 6) The coil driving circuit unit 330 is controlled to each feed coil 210 to apply a high frequency AC current generated by the high frequency power generator 320.

In step S64, the control unit 350 charges the intensity of the charging power induced by the central feeding coil 210 and the peripheral feeding coils 210 sequentially pre-driven in the M th feeding coil block B. The detection unit 340 detects and temporarily stores the detected charging power intensity value in the internal memory along with the coil number.

In step S65, it is checked whether the power supply coil 210 in which the charging power is detected in the M-th power supply coil block B exists, and when the power supply coil 210 in which the charging power is detected does not exist, in step S66. The process proceeds to step S62 in a state where the process is performed to increase the block number index M of the power supply coil block B by one, and if there is a power supply coil 210 in which charging power is detected, the process proceeds to step S67. To implement.

In step S67, the control unit 350 reads the strengths of the charging power of the center feed coil 210 and the peripheral feed coil 210 configured in the M-th feed coil block B from the internal memory to the center feed coil 210. ) And the intensity of the charging power of the peripheral power supply coil 210.

In step S68, it is determined whether the intensity of the charging power of the center feed coil 210 is the maximum value, and if the feed coil 210 having the maximum charging power is not the center feed coil 210, step S69. The process is carried out, and if the feed coil 210 having the maximum charging power is the center feed coil 210, the process proceeds to step S72.

Steps S69 to S71 are processes that are performed when the power supply coil 210 whose intensity of charging power is the maximum value is not the center power supply coil 210. The value of the feeding coil 210 is changed to the center feeding coil 210 and reassigned. In operation S70, the controller 350 sequentially drives only the peripheral power supply coils 210 adjacent to the central power supply coil 210. That is, only the power supply coils 210 in which the preliminary driving and charging power detection has not been performed around the center power supply coils 210 are selected, and the selected power supply coils 210 are individually and sequentially disposed in the coil drive circuit unit 330. By controlling, the high frequency AC current generated by the high frequency power generator 320 is applied. Then, in step S72, the control unit detects the intensity of the charging power induced in each of the power supply coils 210 preliminarily driven through the charging power detector 340, and detects the detected charging power intensity value with the coil number. Temporarily store it together in internal memory. This process is repeatedly performed until the center feed coil 210 becomes a feed coil having a maximum value.

In step S72, the control unit 350 searches for the power receiving coil 410 to be located at the position of the center feeding coil 210.

As described above, the contactless charging device according to the present invention does not include a separate wireless communication module, and has a contactless charging pad having a feed coil array in which a plurality of feed coils are arranged even with a basic configuration of the contactless charging device. Since the position of the faucet coil randomly located at can be searched, the contactless charging can be performed with optimum efficiency while minimizing energy waste.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not to be limited to the details thereof and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

100: contactless charging device 200: contactless charging pad
210: power supply coil 220: power supply coil array
300: contactless charging module 310: power supply
320: high frequency power generating unit 330: coil driving circuit unit
340: charging power detection unit 350: control unit

Claims (19)

A contactless charging pad including a power supply coil array in which a plurality of power supply coils are magnetically coupled to the power reception coil embedded in the battery device to induce charging power; And
Preliminarily driving each of the feed coils of the feed coil array, and monitor the charging power induced according to the preliminary driving of each feed coil to search for the position of the faucet coil arbitrarily located on the contactless charging pad. And a contactless charging module configured to drive only a power supply coil corresponding to a position to deliver charging power to the battery device in a contactless manner. The method of claim 1,
The contactless charging module,
A power supply unit which receives commercial AC power and converts the power into DC power;
A high frequency power generation unit generating the power supplied from the power supply unit as a high frequency AC current required for contactless charging;
A coil driving circuit unit selectively applying high frequency AC current generated from the high frequency power generator to each of the feed coils of the feed coil array;
A charging power detector configured to detect and output an intensity of charging power induced by driving each of the feeding coils of the feeding coil array; And
The coil driving circuit unit is controlled to preliminarily drive each of the feed coils of the feed coil array, and the intensity of the charge power of each of the feed coils detected by the charge power detector is monitored to randomly position the faucet on the contactless charging pad. And a control unit for searching the position of the coil and driving only the feeding coil corresponding to the searched position. 3. The method of claim 2,
The control unit of the contactless charging module,
The coil driving circuit unit is controlled to pre-drive each of the feed coils of the feed coil array, and when the intensity of the charge power of each feed coil detected by the charge power detector exceeds a predetermined level, the power supply coil is positioned at the position of the feed coil. A contactless charging device, characterized in that the search for the power receiving coil is located. 3. The method of claim 2,
The control unit of the contactless charging module,
The coil driving circuit unit is controlled to pre-drive each of the feed coils of the feed coil array, and the strength of the charge power of each feed coil detected by the charge power detector is compared with each other at a position of the feed coil having the maximum charge power. The contactless charging device of claim 1, wherein the power receiver coil is located. 3. The method of claim 2,
The control unit of the contactless charging module,
And contacting each of the feed coils of the feed coil array into a center feed coil and peripheral feed coils adjacent to the center feed coil to divide and control at least one feed coil block. The method of claim 5,
The control unit of the contactless charging module,
Select a power supply coil block from the power supply coil block, and control the coil drive circuit to sequentially drive the center feed coil and the surrounding feed coils of the feed coil block in sequence, and the center feed coil detected by the charging power detector And comparing the strength of the charging power of the peripheral power supply coils with each other and searching for the position of the power receiving coil at the position of the center power supply coil when the charging power of the center coil is the maximum value. The method of claim 5,
The control unit of the contactless charging module,
Select a power supply coil block from the power supply coil block, and control the coil drive circuit to sequentially drive the center feed coil and the surrounding feed coils of the feed coil block in sequence, and the center feed coil detected by the charging power detector Comparing the strengths of the charging powers of the peripheral power supply coils with each other, and when there is a value greater than the value of the central power supply coils among the peripheral power supply coils, the feeder coil having the maximum strength of the charging power in the corresponding power supply coil block is newly centered. And the peripheral feed coils adjacent to the redirected center feed coils form a virtual feed coil block composed of new peripheral feed coils. The method of claim 7, wherein
The control unit of the contactless charging module,
Contactless charging device, characterized in that it continues until the charging power of the center feed coil or the redesignated center feed coil reaches a maximum value. The method of claim 5,
The control unit of the contactless charging module,
Pre-drive all of the center feed coils of the feed coil blocks and compare the strength of the charge power detected by the charge power detector to start the search of the power receiver coil in the feed coil block of the center feed coil that represents the maximum value; Solid state charging device. The method of claim 5,
The control unit of the contactless charging module,
Pre-drive all of the center feed coils of the feed coil blocks, and compare the strength of the charge power detected by the charge power detector to start searching for the receive coil in the feed coil block of the center feed coil that represents a predetermined level or more; A contactless charging device characterized by the above. The method of claim 5,
The control unit of the contactless charging module,
Select a power supply coil block from the power supply coil block, and control the coil drive circuit to sequentially drive the center feed coil and the surrounding feed coils of the feed coil block in sequence, and the center feed coil detected by the charging power detector Comparing the strengths of the charging powers of the peripheral power supply coils with each other, and selecting the new power supply coil block as the power supply coil block for searching the power receiving coils when the strength of the charging power of all the power supply coils in the corresponding power supply coil block is less than or equal to a predetermined level. A contactless charging device characterized by the above. The method of claim 1,
The feed coil array is a contactless charging device, characterized in that the plurality of feed coils are arranged in a staggered (Zig-Zag) form with each other. The method of claim 1,
The feed coil array is a contactless charging device, characterized in that a plurality of feed coils are arranged in a matrix form. In the contactless charging control method using a contactless charging pad comprising a feeder coil array is arranged magnetically coupled to the power receiving coil embedded in the battery device to induce charging power,
(a) pre-driving each of the feed coils of the feed coil array;
(b) searching the position of the power receiving coil arbitrarily located on the contactless charging pad by monitoring the intensity of the charging power induced by the preliminary driving of each feeding coil of the feeding coil array; And
and (c) driving only a power supply coil corresponding to a position where the power receiving coil is found to supply charging power to the battery device in a contactless manner. 15. The method of claim 14,
The step (b)
And if the strength of the detected charging power of each of the power feeding coils exceeds a predetermined level, searching that the power receiving coil is located at a position of the power feeding coil. 15. The method of claim 14,
The step (b)
And comparing the strengths of the detected charging powers of the respective feeding coils with each other and searching for the position of the receiving coil at the position of the feeding coil having the maximum charging power. In the contactless charging control method using a contactless charging pad comprising a feeder coil array is arranged magnetically coupled to the power receiving coil embedded in the battery device to induce charging power,
(a) grouping each of the feed coils of the feed coil array into a center feed coil and peripheral feed coils adjacent to the center feed coil and classifying them into at least one feed coil block, and corresponding feed coils for each feed coil block Sequentially pre-driving the center feed coil and peripheral feed coils of the block;
(b) monitoring whether charging power is detected as the center feed coil and the surrounding feed coils of the feed coil block are sequentially preliminarily driven;
(c) When the charging power is detected in the feeding coil of the feeding coil block, the strength of the charging power of the center feeding coil and the surrounding feeding coils of the feeding coil block is compared with each other and the charging power is at the position of the feeding coil having the maximum value. Searching for where the receiving coil is located; And
and (d) driving only a power supply coil corresponding to a position where the power receiving coil is found to supply charging power to the battery device in a contactless manner. 18. The method of claim 17,
The step (c)
When the power supply coil having the maximum charging power is the peripheral power supply coil by comparing the strength of the charging power of the center power supply coil and the peripheral power supply coils of the power supply coil block with each other,
(c1) reassigning the peripheral power supply coil having the maximum charging power to the center power supply coil;
(c2) pre-driving peripheral feed coils of the redirected center feed coil; And
(c3) comparing the strength of the charging power of the peripheral power supply coil detected by the preliminary driving of the peripheral power supply coils with the intensity of the recharging power of the re-designated center power supply coil, and comparing the received power to the position of the power supply coil having the maximum charging power. And searching for where the coil is located. 19. The method of claim 18,
(C1) to (c3), the contactless charging control method characterized in that it continues until the charging power of the center feed coil or the redesignated center feed coil reaches a maximum value.

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