WO2007086673A1

WO2007086673A1 - Charging system for mobile devices

Info

Publication number: WO2007086673A1
Application number: PCT/KR2007/000402
Authority: WO
Inventors: Jae-Yong Koh
Original assignee: Ivolta, Inc.
Priority date: 2006-01-26
Filing date: 2007-01-23
Publication date: 2007-08-02
Also published as: KR100736387B1

Abstract

The present invention relates to a charging system for mobile devices, in which power for charging is applied from planar power terminals, which are arranged in a matrix form and are adapted to supply power for charging, in a contact or contactless manner, and in which the power terminals are connected to two electrodes of a storage battery using a circuit for causing the applied power to flow in a certain direction. The charging system of the present invention includes a power supply unit (100) having a planar supporting surface and a plurality of planar power terminals (X) arranged on the supporting surface in a certain pattern, and a storage battery having a contact surface opposite the supporting surface and a plurality of charging terminals (Y) arranged on the contact surface in a certain pattern.

Description

CHARGING SYSTEM FOR MOBILE DEVICES

Technical Field

[1] The present invention relates, in general, to the charging of mobile devices and, more particularly, to a charging system for mobile devices, in which power for charging is applied from planar power terminals, which are arranged in a matrix form and are adapted to supply power for charging in a contact or contactless manner, and in which the power terminals are connected to two electrodes of a storage battery using a circuit for causing the applied power to flow in a certain direction in order to perform charging, thus enabling charging without requiring a separate control operation for a power supply process. Background Art

[2] With the tendency of technology toward advanced technology and high technology, the shapes and functionality of mobile devices, such as a mobile phone, a Personal Digital Assistant (PDA), an MPEG-I Audio Layer-3 (MPEG3) player, a Global Positioning System (GPS), and a notebook computer, have been diversified, and the frequency of use thereof has increased.

[3] Since such a mobile device is provided with a storage battery, it has the convenience of enabling the use thereof anytime and anywhere without temporal or spatial restrictions in a charged state. In order to charge the storage battery of a mobile device, a method of connecting the storage battery to an adapter belonging to each mobile device, or inserting the storage battery of the mobile device into a dedicated charging device, such as a cradle, and charging the storage battery, must be used, and thus a more convenient charging method is required.

[4] FIG. 1 is a diagram showing the construction of a conventional capacitively- coupled contactless charging system for mobile devices, and FIG. 2 is a detailed diagram showing the power supply side of the conventional capacitively-coupled charging system.

[5] The capacitively-coupled contactless charging system shown in the drawings is described. In the charging system, a voltage converter 110, a frequency converter 120, a control unit 130, and power pads M are included in a power supply unit 100, and charging pads N, a rectifier 210, a voltage converter 220, a storage battery 230, and a load 240 are included in each mobile device 200.

[6] Such a capacitively-coupled contactless charging system is a charging system operated such that AC power for charging from the power supply unit 100 is applied to the mobile device 200 in a capacitive coupling manner in a contactless state between the plurality of pads M of the power supply unit 100 for applying power for charging, and the charging pads N of the mobile device 200, the applied AC power is rectified by the rectifier 210 and is converted by the voltage converter 220, and the converted power is used to charge the storage capacitor 230.

[7] A contact type charging system for bringing the power pads M of the power supply unit 100 into direct contact with the charging pads N of the mobile device 200 to perform charging has been proposed in addition to the contactless charging system.

[8] However, as shown in the drawings, the capacitively-coupled charging system or a contact type charging system must be provided with the control unit 130 for controlling the polarity of power to be applied to the power pads M of the power supply unit 100.

[9] That is, full AC power must be applied to the two charging pads N of the mobile device side 200 to enable rectification in such a way that positive and negative potentials alternate and two AC terminals correspond to opposite polarities. For this operation, the control unit 130 must check the opposite states of the two charging pads N of the mobile device 200 and respective power pads M, and control the state of the application of power.

[10] However, such a control operation is problematic in that the control process is complicated, the control operation itself causes great restrictions in the design of a charging system, the construction thereof is complicated, and the cost thereof is increased.

Disclosure of Invention

Technical Problem

[11] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a charging system for mobile devices, in which power for charging is applied from planar power terminals, which are arranged in a matrix form and are adapted to supply power for charging, in a contact or contactless manner, and in which the power terminals are connected to two electrodes of a storage battery using a circuit for causing the applied power to flow in a certain direction in order to perform charging, thus enabling charging without requiring a separate control operation for a power supply process. Technical Solution

[12] In order to accomplish the above object, the present invention provides a charging system, the charging system including a power supply unit having a supporting surface and a plurality of planar power terminals arranged on the supporting surface in a certain pattern, and a storage battery having a contact surface opposite the supporting surface and a plurality of charging terminal groups arranged on the contact surface, wherein the power terminals are arranged to have a gap therebetween, power being supplied such that power terminals having different polarities are arranged together, and each of the charging terminal groups comprises at least one charging terminal opposite an area of an end portion of each power terminal, and each charging terminal is connected to the storage battery via a rectifying device so that a rectifying device connected in a forward direction is connected to an anode of the storage battery, and a rectifying device connected in a reverse direction is connected to a cathode of the storage battery, thus enabling a charging circuit to be formed regardless of a location and direction in which the storage battery is placed on the supporting surface of the power supply unit.

[13] Preferably, the charging system may further comprise a wiring circuit constructed such that, among the charging terminals, a charging terminal connected to a rectifying device in a forward direction is connected in common to a first end of another rectifying device in a reverse direction, and a second end thereof is connected to the cathode of the storage battery, and such that a charging terminal connected to a rectifying device in a reverse direction is connected in common to a first end of another rectifying device in a forward direction, and a second end thereof is connected to the anode of the storage battery.

[14] Preferably, if the power is Alternating Current (AC) power, each of the charging terminals may be implemented as a planar charging terminal having a cross section that is exposed from the contact surface and is provided with a certain area, and either or both of the planar power terminals and the planar charging terminals are covered with dielectric layers having permittivity, thus enabling a charging circuit to be formed through capacitive coupling between the planar power terminal and the planar charging terminal.

Advantageous Effects

[15] Accordingly, the present invention realizes convenience of use because charging is possible even if a plurality of mobile devices is placed at arbitrary locations on a supporting surface for charging.

[16] Furthermore, the present invention provides advantages in that, in the case of technical construction, passive devices such as diodes can be used, so that a control unit is not necessary when power for charging is applied, and production costs can be reduced, and in that a rectification circuit is operated to prevent discharge from occurring even if both exposed electrode terminals of a storage battery are shorted to each other through a conductor, thus greatly improving stability for portability. Brief Description of the Drawings [17] FIG. 1 is a diagram showing the construction of a conventional capacitively- coupled contactless charging system for mobile devices; [18] FIG. 2 is a detailed diagram showing the power supply side of the conventional ca- pacitively-coupled charging system; [19] FIG. 3 is a diagram showing the construction of a DC contact charging system for mobile devices according to an embodiment of the present invention; [20] FIG. 4 is a diagram showing examples of the arrangement of power terminals and charging terminals of the charging system according to an embodiment of the present invention; [21] FIG. 5 is a diagram showing another construction of a DC contact charging system according to an embodiment of the present invention; [22] FIG. 6 is a diagram showing the construction of an AC contact charging system according to another embodiment of the present invention; [23] FIG. 7 is a diagram showing the construction of an AC capacitively-coupled charging system according to a further embodiment of the present invention; and [24] FIG. 8 is a diagram showing the charging of actual mobile devices using the charging system of the present invention.

Best Mode for Carrying Out the Invention [25] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. [26] A charging system for mobile devices according to the present invention can be applied to Direct Current (DC) contact charging, Alternating Current (AC) contact charging, and AC capacitively-coupled charging according to an operation method, and the operating process thereof will be described later. [27] FIG. 3 is a diagram showing a DC contact charging system for mobile devices according to an embodiment of the present invention, FIG. 3 (a) illustrating an overall conceptual view thereof, and FIG. 3(b) illustrating the arrangement of the power terminals of a power supply unit in a plane. [28] As shown in the drawings, the charging system according to an embodiment of the present invention includes a power supply unit 300 having a planar supporting surface, and a plurality of planar power terminals X arranged on the supporting surface in the form of a certain pattern, and a mobile device 400 having a planar contact surface opposite the supporting surface and a plurality of charging terminals arranged on the contact surface in the form of a certain pattern. [29] The supporting surface and the contact surface preferably have approximately planar shapes, but they can be implemented as opposite curved surfaces or as embossed surfaces within a range that does not depart from the technical spirit of the present invention.

[30] The power supply unit 300 includes a power supply stage 310 for converting input power into power for charging, and outputting the power for charging, and the plurality of planar power terminals X that are arranged in the form of a matrix and are connected to the output lines of the power supply stage 310.

[31] In this case, the planar power terminals are not necessarily limited to planar shapes, and may be shapes a predetermined area of which is exposed from the supporting surface, or may include, in detail, curved surfaces or embossed surfaces.

[32] In the DC contact charging system of FIG. 3, the power supply stage 310 rectifies the input AC power, smoothes and stabilizes ripple components, and outputs the smoothed and stabilized power. Two lines for such DC charging power are connected to the plurality of planar power terminals X arranged on the supporting surface in the form of a matrix.

[33] In this case, the power terminals X are preferably alternately connected to positive

(+) and negative (-) lines, so that the positive (+) and negative (-) power terminals are arranged in the form of a chessboard, but the case where the power terminals are arranged in one line is included in the present invention. As will be understood through the operating process of the charging system according to the present invention, the positive (+) and negative (-) polarities need only be suitably arranged together even if the power terminals are not necessarily alternately connected to the positive (+) and negative (-) lines.

[34] In this embodiment, a charging circuit is constructed through a direct contact between the power terminals X and the charging terminals Y, so that the storage battery of the mobile device 400 is charged by the power of the power supply unit 300.

[35] In the mobile device 400, the charging terminals Y are densely arranged on the planar contact surface in the form of a matrix so that the charging terminals come into contact with the power terminals X on the supporting surface of the power supply stage 310.

[36] As shown in the drawing, this embodiment shows an arrangement in which power t erminals X having rectangular shapes are arranged in the form of a matrix, but it is possible for the power terminals X to be formed to have various shapes, such as circles or polygons, and to be arranged in various geometrical forms. Further, the charging terminals Y of the mobile device 400 may be formed in various shapes, and may be variously arranged in a state in which the charging terminals Y can come into contact with the power terminals X.

[37] In this case, arrangement is preferably conducted to satisfy the following conditions so that charging is possible even if the mobile device 400 is placed at any two- dimensional location on the supporting surface of the power supply stage 310 at an arbitrary rotation angle (hereinafter referred to as 'arrangement conditions for contact type').

[38] 1) At least one of the charging terminals Y of the mobile device 400 comes into contact with a power terminal X corresponding to one polarity, among the power terminals X, in the same current direction.

[39] 2) At least one of the charging terminals Y of the mobile device 400 comes into contact with a power terminal X corresponding to the other polarity, among the power terminals X, in the same current direction.

[40] 3) A short circuit between the positive (+) and negative (-) terminals, which correspond to two polarities of the power terminals X, does not occur due to the contact between the power terminals X of the power supply stage 310 and the charging terminals Y of the mobile device 400.

[41] Rectifying devices 410 are connected to the rear portions of the lines of the charging terminals Y, respectively. In this embodiment, a single rectifying device 410 is connected to the line of each charging terminal Y. Generally, a diode can be used as the rectifying device 410. However, it is apparent that various electronic devices, including semiconductor switching devices, such as a bipolar transistor, a field effect transistor, and a Silicon Controlled Rectifier (SCR), can be used as rectifying devices if they are provided with a rectification function of allowing charges to flow in one direction.

[42] The charging system of the present invention is constructed so that the lines of the rectifying devices 410 connected in a forward direction are collected and connected to the anode (+ polarity) of the storage battery of the mobile device 400, and the lines of the rectifying devices 410 connected in a reverse direction are collected and connected to the cathode (- polarity) of the storage battery of the rectifying device 410.

[43] Hereinafter, the term "forward direction" is defined as the state in which a rectifying device is connected to allow current to flow from the power terminals to the storage battery, and the term "reverse direction" is defined as the state in which a rectifying device is connected to allow current to flow from the storage battery to the power terminals.

[44] As shown in the drawings, the rectifying devices 410 used in the present embodiment are connected in certain directions. In detail, diodes are connected to the charging terminals YOl, Y03, Y05, Y07, and Y09 in a forward direction, and diodes are connected to the charging terminals Y02, Y04, Y06, and Y08 in a reverse direction.

[45] Meanwhile, as shown in the drawings, the positive (+) line of the power supply sta ge 310 is connected to the power terminals XOlOl, X0103,..., X0202, X0204,... , and the negative (-) line of the power supply stage 310 is connected to the power terminals X0102, X0104,..., X0201, X0203,.... In this case, the following results can be obtained for the charging terminals YOl to Y09.

[46] Table 1

[47] Therefore, the lines to which the rectifying devices 410 are connected in a forward direction can be collected and used as an anode (positive electrode) 411 for charging the storage battery of the mobile device 400, and the lines to which the rectifying devices 410 are connected in a reverse direction can be collected and used as a cathode (negative electrode) 412 for charging the storage battery.

[48] Further, since the anode 411 and the cathode 412 are respectively connected to the anode (+) 413 and the cathode (-) 414 of the storage battery, mounted in the mobile device 400, charging is possible regardless of the state of matching between the power terminals X of the power supply unit 300 and the charging terminals Y of the mobile device 400.

[49] Preferably, the charging terminals Y are constructed more densely than corresponding power terminals X so that two or more two charging terminals having different polarities are connected to the area of each power terminal X, thus enabling a charging circuit to be constructed regardless of the location at which the storage battery of the mobile device is placed on the supporting surface of the power supply unit 300. At least one of the two or more charging terminals Y is connected to the anode of the storage battery via a rectifying device 410 connected in a forward direction, and at least another one of the two or more charging terminals Y is connected to the cathode of the storage battery via a rectifying device 410 connected in a reverse direction.

[50] Further, in the case of charging terminal groups, each including two or more charging terminals Y having different polarities, two or more groups are preferably formed so that the charging terminal groups can match a plurality of power terminals having different polarities. Further, the maximum width of the tip of each charging terminal Y is preferably formed to be less than the gap between the planar power terminals X, thus preventing a short circuit from occurring between the power terminals X due to the charging terminals Y.

[51] FIG. 4 is a diagram showing examples of the arrangement of power terminals and charging terminals according to an embodiment of the present invention.

[52] As shown in the drawing, rectangular power terminals X are arranged in a plane to allow the polarities thereof to be alternately arranged, and respective charging terminals Y are represented by circles indicating polarities. The examples satisfying such conditions and the above-described arrangement conditions for contact type are depicted.

[53] A plurality of charging terminal groups can be continuously arranged, as shown in

FIG. 4(a), or they can be arranged to be spaced apart from each other, as shown in FIG. 4(b).

[54] FIG. 5 is a diagram showing another construction of a DC contact charging system,

FIG. 5 (a) illustrating an overall conceptual view, and FIG. 5(b) illustrating the arrangement of the power terminals of a power supply unit in a plane.

[55] The embodiment of FIG. 5 has the same construction as the embodiment of FIG. 3 except that two rectifying devices 410 are connected together to the line of a single charging terminal Y in a forward direction and in a reverse direction, respectively.

[56] In this embodiment, each of two or more charging terminals Y is connected in common to two rectifying devices 410 while one of the rectifying devices is connected in a forward direction, and the other thereof is connected in a reverse direction. In this case, a second end of each rectifying device 410, connected in the forward direction, is connected to the anode of the storage battery, and a second end of each rectifying device 410, connected in a reverse direction, is connected to the cathode of the storage battery.

[57] Therefore, in this embodiment, current flows through all charging terminals Y, but current flows through the charging terminals YOl, Y02, Y03, Y07, and Y08 due to the rectifying devices 410 connected in a reverse direction, and current flows through the charging terminals Y04, Y05, and Y06 due to the rectifying devices 410 connected in a forward direction, so that the anode (+) 411 and the cathode (-) 412 are formed, as described above in the embodiment of FIG. 3. The principles by which the storage battery of the mobile device 400 is charged through the anode and cathode are the same as those of the above description.

[58] However, in the embodiment of FIG. 5, since a separate polarity is not assigned to each charging terminal Y, there is no need to cause two or more charging terminals, having different polarities, to be necessarily connected to the area of each power terminal X, and a charging circuit can be constructed even if only a single charging terminal Y is connected to each power terminal X. Therefore, there is an advantage in that the degree of freedom in the design of products is further improved.

[59] Therefore, in the embodiment of FIG. 5, two or more charging terminal groups are preferably formed so that they each include one or more charging terminals Y and they match a plurality of power terminals X having different polarities.

[60] FIG. 6 is a diagram showing the construction of an AC contact charging system according to another embodiment of the present invention, FIG. 6(a) illustrating an overall conceptual view thereof, and FIG. 6(b) illustrating the arrangement of the power terminals of the power supply unit in a plane.

[61] In this embodiment, two output lines of the power supply stage 310 are constructed to be connected to a plurality of power terminals X.

[62] Therefore, at any one time point t, if power terminals XOlOl, XO 103,..., X0202,

X0204,... have a high potential (+ potential), and power terminals XO 102, XO 104,..., X0201, X0203,... have a low potential (- potential), the operating state of the embodiment of FIG. 3 is obtained, and charging can be performed using the anode (+) and the cathode (-) formed at this time, as described above.

[63] However, in this embodiment, AC power is used as power for charging, so that, at a time point t+1, the polarities (potentials) of the power terminals X are changed, but the circuit including rectifying devices is constructed, as shown in FIG. 6, and thus positive and negative potentials are still supplied to the anode (+) and the cathode (-) of the storage battery.

[64] Further, the AC contact charging system of the present invention may be preferably constructed such that two rectifying devices 410 are connected to each charging terminal Y in a forward direction and a reverse direction, as shown in the embodiment of FIG. 5.

[65] FIG. 7 is a diagram showing an AC capacitively-coupled charging system according to a further embodiment of the present invention, FIG. 7 (a) illustrating an overall conceptual view thereof, and FIG. 7(b) illustrating the arrangement of the power terminals of a power supply unit in a plane.

[66] As shown in the drawings, in this embodiment, AC power is supplied as power for charging, as in the case of the embodiment of FIG. 6, but there is a difference in that a charging circuit is constructed in a capacitive coupling manner instead of through direct contact between conductive terminals. The basic operating principles other than this difference are identical to those of the embodiment of FIG. 6.

[67] The present embodiment is implemented to construct a charging circuit using capacitive coupling, so that dielectric layers having permittivity are formed between the power terminals X of the power supply unit 300 and the charging terminals Y of the mobile device 400, and AC power is applied to the mobile device 400 as power for charging output from the power supply stage 310, and thus the charging circuit is implemented in a capacitive coupling manner, unlike the embodiments of FIGS. 3 and 5, which use direct contact between terminals.

[68] In this case, the tip of each charging terminal Y is preferably formed in a planar shape having a certain cross section, and thus capacitance is formed between each power terminal X and each charging terminal Y. Herein, the shape is not limited to a plane, and any shape having capacitance suitable to be opposite the planar power terminal X is sufficient for use as the planar shape.

[69] The dielectric layers can be formed on either or both of the power terminals X and the charging terminals Y.

[70] In this embodiment, the power terminals X, each having a rectangular shape, are arranged in the form of a matrix, but, as described above, the power terminals X of the power supply unit 300 or the charging terminals Y of the mobile device 400 can be formed in various shapes and can be arranged in various geometrical forms.

[71] Further, in this embodiment, arrangement is preferably implemented to satisfy the following conditions such that capacitive coupling is sufficiently performed and charging is possible even if the mobile device 400 is placed at any two-dimensional location on the supporting surface of the power supply stage 310 at an arbitrary rotation angle (hereinafter refer to as 'arrangement conditions for capacitive coupling type').

[72] I) A sufficient number of charging terminals Y of the mobile device 400 is arranged on the power terminals X of the power supply unit 300 corresponding to one polarity of AC power, thus forming forward capacitive coupling.

[73] 2) A sufficient number of charging terminals Y of the mobile device 400 is arranged on the power terminals X of the power supply unit 300 corresponding to the other polarity of the AC power, thus forming reverse capacitive coupling.

[74] 3) The number of charging terminals Y of the mobile device 400, placed to range over the two polarities of AC power by the power terminals X and provided with a deteriorated capacitive coupling function, may be zero, or may be negligible.

[75] A charging circuit is formed through capacitive coupling using the above method, and the principles by which the storage battery of the mobile device 400 is charged using the charging circuit are identical to those of the above description.

[76] Furthermore, as shown in the embodiment of FIG. 5, the AC capacitively-coupled charging system may be preferably constructed so that two rectifying devices 410 are connected to each charging terminal Y in a forward direction and a reverse direction, respectively.

[77] In this embodiment, the power supply stage 310 of the power supply unit 300 preferably has a function of converting input AC power according to the magnitude of charging voltage or charging current, and of increasing typical AC power frequency to reduce resistance caused by contactless capacitive coupling.

[78] Moreover, a charging system according to yet another embodiment of the present invention may be implemented as a charging system using inductive coupling, which enables inductors to be formed in a plurality of power terminals X and charging terminals Y, instead of capacitive coupling. In this case, each of the power terminals X and charging terminals Y is provided with a terminal unit, in which an inductive coil is formed.

[79] FIG. 8 is a diagram showing a procedure for charging actual mobile devices using the charging system of the present invention.

[80] As shown in FIG. 8, various types of mobile devices are placed on a power supply unit 300, and can be charged without restriction as to the direction in which the mobile devices are placed, and thus it is evident that the charging system is very convenient to use.

[81] Further, in the power supply unit 300, various constant voltage circuits and overvoltage prevention circuits can be additionally provided in the case of DC power in order to more stably and efficiently perform charging using power for charging generated by the power supply stage 310, and circuits for protecting the power supply unit 300 from electric leakage and static electricity can be additionally provided. Moreover, it will be apparent to those skilled in the art that a smoothing circuit, a stabilization circuit, an overcharging prevention circuit, etc. can be added at the input side of the storage battery of the mobile device 400 as needed.

[82] In addition, for the connection of the power terminals X, it is preferable that two terminals of the power supply stage 310 be alternately connected. However, various embodiments are possible in such a way that, if the power terminals X can be connected to form an anode (+) and a cathode (-) in the mobile device 400, the terminals can be grouped to form a single polarity in a partial local region, or the terminals can be formed to cause two polarities to coexist without coping with a specific format, as described above with reference to the operating principles.

[83] Further, a rectifying circuit can be integrated with a storage battery, but the present invention can also realize a method of detachably constructing a rectifying circuit in the form of an adaptor, charging the storage battery of a mobile device in cradles as in the case of the prior art, and utilizing the charging system of the present invention if the adaptor is attached to the storage battery.

[84]

Industrial Applicability [85] As described above, the present invention is constructed such that charging is possible even if a plurality of mobile devices is placed at arbitrary locations on a supporting surface for charging, thus realizing convenient use.

[86] In addition, the present invention is constructed such that, in the case of technical construction, since passive devices, such as diodes, can be used, a control unit is not necessary when power for charging is applied, thus reducing production costs, and such that a rectifying circuit is operated to prevent discharge from occurring even if both exposed electrode terminals of a storage battery are shorted to each other through a conductor, thus greatly improving stability for portability.

[87]

Claims

[1] A charging system, the charging system including a power supply unit having a supporting surface and a plurality of planar power terminals arranged on the supporting surface in a certain pattern, and a storage battery having a contact surface opposite the supporting surface and a plurality of charging terminal groups arranged on the contact surface, wherein: the power terminals are arranged to have a gap therebetween, power being supplied such that power terminals having different polarities are arranged together, and each of the charging terminal groups comprises at least one charging terminal opposite an area of an end portion of each power terminal, and each charging terminal is connected to the storage battery via a rectifying device so that a rectifying device connected in a forward direction is connected to an anode of the storage battery, and a rectifying device connected in a reverse direction is connected to a cathode of the storage battery, thus enabling a charging circuit to be formed regardless of a location and direction in which the storage battery is placed on the supporting surface of the power supply unit.

[2] The charging system according to claim 1, wherein each of the charging terminal groups comprises a plurality of charging terminals that are densely arranged to an extent such that two or more charging terminals can come into contact with an area of the end portion of the planar power terminal, at least one of the charging terminals being connected to a rectifying device in a forward direction, at least another one thereof being connected to a rectifying device in a reverse direction.

[3] The charging system according to claim 1, wherein the charging terminals are implemented such that, among the charging terminals, a charging terminal connected to a rectifying device in a forward direction is connected in common to a first end of another rectifying device in a reverse direction, and a second end thereof is connected to the cathode of the storage battery, and such that a charging terminal connected to a rectifying device in a reverse direction is connected in common to a first end of another rectifying device in a forward direction, and a second end thereof is connected to the anode of the storage battery.

[4] The charging system according to any of claims 1 to 3, wherein each of the charging terminals is formed such that a maximum width of a cross section thereof exposed from the contact surface is less than a minimum gap between the planar power terminals.

[5] The charging system according to any of claims 1 to 3, wherein the charging terminal groups are arranged continuously or arranged to be spaced apart from each other so that they can match two or more power terminals having different polarities.

[6] The charging system according to any of claims 1 to 3, wherein: the power is Alternating Current (AC) power, and each of the charging terminals is implemented as a planar charging terminal having a cross section that is exposed from the contact surface and is provided with a certain area, and either or both of the planar power terminals and the planar charging terminals are covered with dielectric layers having permittivity, thus enabling a charging circuit to be formed through capacitive coupling between the planar power terminal and the planar charging terminal.

[7] The charging system according to claim 6, wherein each of the charging terminals is formed so that a maximum width of a cross section thereof exposed from the contact surface is less than a minimum gap between the plurality of planar power terminals.

[8] The charging system according to claim 6, wherein the charging terminal groups are arranged continuously or arranged to be spaced apart from each other so that they can match two or more power terminals having different polarities.