Charging pile display device

Abstract

The utility model discloses a charging pile display device, comprising a display screen used for displaying charging related information; the magnetic cloth is arranged above the display screen; the induction coil is arranged above the magnetic cloth; the touch panel is arranged above the induction coil, and the touch panel is made of a transparent material; the circuit board is arranged below the display screen, and the display screen and the induction coil are electrically connected to the circuit board; and the touch panel, the coil, the magnetic cloth, the touch panel and the circuit board are sequentially overlapped in the vertical direction. According to the charging pile display device provided by the invention, the NFC sensing area and the screen display area are arranged in the same area, so that a user can directly swipe a card towards the screen, and the user experience is improved.

Description

Technical Field

[0001] The utility model specifically relates to a charging pile display device. Background Art

[0002] With the rapid development of new energy electric vehicles, the demand for charging piles is increasing. At present, the NFC sensing area and screen display area of ​​charging piles on the market are not in the same place. When using NFC card swiping for billing, users need to find the area, which brings some inconvenience to users. In general, users subconsciously operate on the screen. Utility Model Content

[0003] The utility model provides a charging pile display device to solve the above-mentioned technical problems, and specifically adopts the following technical solutions:

[0004] A charging pile display device, comprising:

[0005] A display screen, used to display charging-related information;

[0006] A magnetic cloth is arranged above the display screen;

[0007] an induction coil, arranged above the magnetic cloth;

[0008] A touch panel is arranged above the induction coil, and the touch panel is made of a transparent material;

[0009] A circuit board is arranged below the display screen, and the display screen and the induction coil are electrically connected to the circuit board;

[0010] The touch panel, the coil, the magnetic cloth, the touch panel and the circuit board are sequentially stacked in an up-and-down direction.

[0011] Furthermore, the display screen includes a display area located in the middle and an annular supporting area located outside the display area, the magnetic cloth is an annular structure corresponding to the annular supporting area of ​​the display screen, and the induction coil is also an annular structure corresponding to the annular supporting area of ​​the display screen. After the display screen, the magnetic cloth and the induction coil are arranged in superposition with each other, the magnetic cloth is located between the induction coil and the display screen, thereby isolating the induction coil and the display screen from each other.

[0012] Furthermore, the annular supporting area of ​​the display screen is made of metal material.

[0013] Furthermore, the number of turns of the induction coil is 4-5 turns, the width of each coil of the induction coil is 0.6-0.62 mm, the coil spacing of the induction coil is 0.21-0.23 mm, and the coil thickness of the induction coil is 0.3-0.5 mm.

[0014] Furthermore, the number of turns of the induction coil is 4 turns, the width of each coil of the induction coil is 0.61 mm, the coil spacing of the induction coil is 0.22 mm, and the coil thickness of the induction coil is 0.4 mm.

[0015] Furthermore, the thickness of the magnetic cloth is 0.08-0.12 mm.

[0016] Furthermore, the thickness of the magnetic cloth is 0.1 mm.

[0017] Furthermore, the display screen is a touch display screen.

[0018] Furthermore, the circuit board is provided with a control circuit, and the control circuit includes a screen driving circuit and an NFC driving circuit;

[0019] The NFC driving circuit includes: a control chip U8, an inductor L1, an inductor L2, a capacitor C5, a capacitor C6, a capacitor C8, a capacitor C9, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a resistor R2, a resistor R3, a capacitor C7, a capacitor C10, a resistor R4 and a resistor R5;

[0020] One end of the inductor L1 is connected to the TX1 port of the control chip, and the other end is connected to one end of the capacitor C5, the capacitor C8 and the capacitor C10;

[0021] One end of the inductor L2 is connected to the TX2 port of the control chip, and the other end is connected to one end of the capacitor C6 and the capacitor C9;

[0022] One end of the resistor R2 and the resistor R3 are connected to the RX port of the control chip U8, the other end of the resistor R2 is connected to one end of the capacitor C7 and the VMID port of the control chip U8, the other end of the capacitor C7 is grounded, and the other end of the resistor R3 is connected to the other end of the capacitor C10;

[0023] The other end of the capacitor C8 is connected to the capacitor C11, the capacitor C13 and one end of the resistor R4, the other end of the capacitor C9 is connected to the capacitor C12, the capacitor C14 and one end of the resistor R5, and the other ends of the resistor R4 and the resistor R5 are connected to the induction coil;

[0024] The other end of the capacitor C5 is connected to the other end of the capacitor C6, the other end of the capacitor C11 is connected to the other end of the capacitor C12, the other end of the capacitor C13 is connected to the other end of the capacitor C14, the midpoint of the capacitor C5 and the capacitor C6, the midpoint of the capacitor C11 and the capacitor C12, and the midpoint of the capacitor C13 and the capacitor C14 are interconnected and connected to the TVss port of the control chip U8.

[0025] Further, the resistor R4 and the resistor R5 are 1Ω, the capacitor C8 and the capacitor C9 are 27pF, and the capacitor C11, the capacitor C12, the capacitor C13, and the capacitor C14 are 47pF.

[0026] The utility model is beneficial in that the provided charging pile display device sets the NFC sensing area and the screen display area in the same area, so that the user can directly swipe the card on the screen, thereby improving the user experience.

[0027] The utility model is beneficial in that the provided charging pile display device solves the signal shielding problem of the NFC coil placed between the screen and the metal shell by setting the magnetic cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 It is a schematic diagram of a charging pile display device of the utility model;

[0030] Figure 2 It is a schematic diagram of the NFC driving circuit of the utility model;

[0031] Display screen 10 , display area 11 , support area 12 , magnetic cloth 20 , induction coil 30 , touch panel 40 , circuit board 50 . DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0033] In the description of this application, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] like Figure 1 A charging pile display device of the present application is shown, comprising: a display screen 10, a magnetic cloth 20, an induction coil 30, a touch pad 40 and a circuit board 50. Specifically, the display screen 10 is used to display charging-related information. The magnetic cloth 20 is arranged above the display screen 10. The induction coil 30 is arranged above the magnetic cloth 20. The touch pad 40 is arranged above the induction coil 30, and the touch pad 40 is made of a transparent material. The circuit board 50 is arranged below the display screen 10, and the display screen 10 and the induction coil 30 are electrically connected to the circuit board 50. The touch pad 40, the coil, the magnetic cloth 20, the touch pad 40 and the circuit board 50 are sequentially stacked in the up and down directions.

[0036] In the embodiment of the present application, the display screen 10 is a touch display screen 10. The display screen 10 includes a display area 11 located in the middle and an annular support area 12 located outside the display area 11, and the annular support area 12 of the display screen 10 is made of metal. The magnetic cloth 20 is an annular structure corresponding to the annular support area 12 of the display screen 10, and the induction coil 30 is also an annular structure corresponding to the annular support area 12 of the display screen 10. After the display screen 10, the magnetic cloth 20 and the induction coil 30 are arranged in a superimposed manner, the magnetic cloth 20 is located between the induction coil 30 and the display screen 10, thereby isolating the induction coil 30 and the display screen 10 from each other.

[0037] The number of turns of the induction coil 30 is 4-5 turns, the width of each coil of the induction coil 30 is 0.6-0.62 mm, the coil spacing of the induction coil 30 is 0.21-0.23 mm, and the coil thickness of the induction coil 30 is 0.3-0.5 mm. Specifically, in the embodiment of the present application, the number of turns of the induction coil 30 is 4 turns, the width of each coil of the induction coil 30 is 0.61 mm, the coil spacing of the induction coil 30 is 0.22 mm, and the coil thickness of the induction coil 30 is 0.4 mm.

[0038] The thickness of the magnetic cloth 20 is 0.08-0.12 mm. In the embodiment of the present application, the thickness of the magnetic cloth 20 is 0.1 mm.

[0039] In an embodiment of the present application, the circuit board 50 is provided with a control circuit, and the control circuit includes a screen driving circuit and an NFC driving circuit. The screen driving circuit is used to drive the display screen 10. The NFC driving circuit is used to interact with the induction coil 30.

[0040] like Figure 2 As shown, the NFC driving circuit includes: control chip U8, inductor L1, inductor L2, capacitor C5, capacitor C6, capacitor C8, capacitor C9, capacitor C11, capacitor C12, capacitor C13, capacitor C14, resistor R2, resistor R3, capacitor C7, capacitor C10, resistor R4 and resistor R5. Among them, inductor L1, inductor L2, capacitor C5 and capacitor C6 form an LC filter circuit. Capacitor C8, capacitor C9, capacitor C11, capacitor C12, capacitor C13 and capacitor C14 form an antenna matching circuit. Resistor R2, resistor R3, capacitor C7 and capacitor C10 form a receiving circuit.

[0041] Specifically, one end of the inductor L1 is connected to the TX1 port of the control chip, and the other end is connected to one end of the capacitor C5, capacitor C8 and capacitor C10. One end of the inductor L2 is connected to the TX2 port of the control chip, and the other end is connected to one end of the capacitor C6 and capacitor C9. One end of the resistor R2 and the resistor R3 are connected to the RX port of the control chip U8, the other end of the resistor R2 is connected to one end of the capacitor C7 and the VMID port of the control chip U8, the other end of the capacitor C7 is grounded, and the other end of the resistor R3 is connected to the other end of the capacitor C10. The other end of the capacitor C8 is connected to one end of the capacitor C11, capacitor C13 and resistor R4, the other end of the capacitor C9 is connected to one end of the capacitor C12, capacitor C14 and resistor R5, and the other end of the resistor R4 and resistor R5 is connected to the induction coil J3. The other ends of capacitor C5 and capacitor C6 are connected, the other ends of capacitor C11 and capacitor C12 are connected, the other ends of capacitor C13 and capacitor C14 are connected, the midpoint of capacitor C5 and capacitor C6, the midpoint of capacitor C11 and capacitor C12, and the midpoint of capacitor C13 and capacitor C14 are connected to each other and to the TVss port of control chip U8.

[0042] The parameters of the components L1, L2, C5, C6, R3, R2, C7, C10 of the filtering and receiving circuits are fixed: as follows

[0043] L1, L2: 2.2uH±5%

[0044] C5, C6: 47pF±2%

[0045] R3: 5.1KΩ±5%

[0046] R2: 820Ω±5%

[0047] C10: 15pF±2%

[0048] C7: 100nF ±2%

[0049] The inductance of the inductive antenna is represented by LA, the total resistance loss of the antenna is represented by RA, and the capacitance loss of the antenna is represented by CA.

[0050] RA = 5*RDC (wire resistance of the coil) = 5*0.53 = 2.65Ω.

[0051] LA=2*l1{ln{l1 / D1}-K}N1 1.8

[0052] Where: l1 is the length of one turn of wire, which is actually 32CM. D1 is the wire width of the antenna, which is 0.61mm. K = 1.47 (square antenna). N1 is the number of turns of the coil, which is 4 turns. 1.8 =12.12. Finally, LA=1930nH is calculated.

[0053] Quality factor Q = ωR*LA / RA = 62.01. To reduce the original quality factor, it is required to increase the external resistor REXT ( Figure 2 The target quality factor is 35.

[0054] R4+R5=ωR*LA / Q(35)-RA=2.045Ω. Take R4=R5=1Ω.

[0055] Use the antenna matching circuit composed of C8, C9, C11, C12, C13, and C14 to match the antenna coil to 50Ω.

[0056]

[0057] C11||C12=C13||C14=1 / W 2 *LA-CS

[0058] C8=C9 takes 27pF

[0059] C11=C12=47pF.

[0060] Any changing magnetic field will induce a voltage on the metal element close to the reader antenna. This induced voltage will generate eddy currents on the metal plane, which will cause the antenna to detune and weaken the magnetic field. The result is a reduction in working distance and possible transmission errors. Shielded magnetic fabric is used to reduce the electric field generated by the antenna coil itself.

[0061] In summary, in this application, the number of antenna turns is 4 turns, the line width is 0.61mm, the line spacing is 0.22mm, R4=R5=1Ω, C8=C9=27pF, C11=C12=C13=C14=47pF, and the coil board thickness is 0.4mm. When the back of the coil is isolated from the iron frame of the screen with 0.1mm thick magnetic cloth, the card swiping and display effects are best.

[0062] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the above embodiments do not limit the utility model in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the utility model.

Claims

1. A charging pile display device, characterized in that: Include: A display screen, used to display charging-related information; A magnetic cloth is arranged above the display screen; an induction coil, arranged above the magnetic cloth; A touch panel is arranged above the induction coil, and the touch panel is made of a transparent material; A circuit board is arranged below the display screen, and the display screen and the induction coil are electrically connected to the circuit board; The touch panel, the coil, the magnetic cloth, the touch panel and the circuit board are sequentially stacked in an up-and-down direction.

2. The charging pile display device according to claim 1, characterized in that: The display screen includes a display area located in the middle and an annular supporting area located outside the display area. The magnetic cloth is an annular structure corresponding to the annular supporting area of ​​the display screen. The induction coil is also an annular structure corresponding to the annular supporting area of ​​the display screen. After the display screen, the magnetic cloth and the induction coil are arranged in a superimposed manner, the magnetic cloth is located between the induction coil and the display screen, thereby isolating the induction coil and the display screen from each other.

3. The charging pile display device according to claim 2, characterized in that: The annular supporting area of ​​the display screen is made of metal material.

4. The charging pile display device according to claim 2, characterized in that: The number of turns of the induction coil is 4-5 turns, the width of each coil of the induction coil is 0.6-0.62 mm, the coil spacing of the induction coil is 0.21-0.23 mm, and the coil thickness of the induction coil is 0.3-0.5 mm.

5. The charging pile display device according to claim 4, characterized in that: The number of turns of the induction coil is 4 turns, the width of each coil of the induction coil is 0.61 mm, the coil spacing of the induction coil is 0.22 mm, and the coil thickness of the induction coil is 0.4 mm.

6. The charging pile display device according to claim 1, characterized in that: The thickness of the magnetic cloth is 0.08-0.12 mm.

7. The charging pile display device according to claim 6, characterized in that: The thickness of the magnetic cloth is 0.1 mm.

8. The charging pile display device according to claim 1, characterized in that: The display screen is a touch display screen.

9. The charging pile display device according to claim 1, characterized in that: The circuit board is provided with a control circuit, and the control circuit includes a screen driving circuit and an NFC driving circuit; The NFC driving circuit includes: a control chip U8, an inductor L1, an inductor L2, a capacitor C5, a capacitor C6, a capacitor C8, a capacitor C9, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a resistor R2, a resistor R3, a capacitor C7, a capacitor C10, a resistor R4 and a resistor R5; One end of the inductor L1 is connected to the TX1 port of the control chip, and the other end is connected to one end of the capacitor C5, the capacitor C8 and the capacitor C10; One end of the inductor L2 is connected to the TX2 port of the control chip, and the other end is connected to one end of the capacitor C6 and the capacitor C9; One end of the resistor R2 and the resistor R3 are connected to the RX port of the control chip U8, the other end of the resistor R2 is connected to one end of the capacitor C7 and the VMID port of the control chip U8, the other end of the capacitor C7 is grounded, and the other end of the resistor R3 is connected to the other end of the capacitor C10; The other end of the capacitor C8 is connected to the capacitor C11, the capacitor C13 and one end of the resistor R4, the other end of the capacitor C9 is connected to the capacitor C12, the capacitor C14 and one end of the resistor R5, and the other ends of the resistor R4 and the resistor R5 are connected to the induction coil; The other end of the capacitor C5 is connected to the other end of the capacitor C6, the other end of the capacitor C11 is connected to the other end of the capacitor C12, the other end of the capacitor C13 is connected to the other end of the capacitor C14, the midpoint of the capacitor C5 and the capacitor C6, the midpoint of the capacitor C11 and the capacitor C12, and the midpoint of the capacitor C13 and the capacitor C14 are interconnected and connected to the TVss port of the control chip U8.

10. The charging pile display device according to claim 9, characterized in that: The resistor R4 and the resistor R5 are 1Ω, the capacitor C8 and the capacitor C9 are 27pF, and the capacitors C11, C12, C13, and C14 are 47pF.

Images