Sliding type tapped coil with variable number of turns

Abstract

The invention provides a sliding type tapped coil with a variable number of turns. The sliding type tapped coil comprises a spiral structure and a sliding rod, the spiral structure comprises n more than or equal to 2 turns of spiral coils with unequal diameters and compensation capacitors; the compensation capacitors are connected in series on the spiral coils; the sliding rod comprises a contact and a long rod; according to the number k of turns of the coil needing to be connected into the circuit, the end of the sliding rod is moved to the position of the k-th turn of exposed coil so that the k turns of coils can be connected with an external power source through the sliding rod, the number of turns of the coil connected into the circuit can be changed by changing the position of the sliding rod, and the variable range of the coil k is 1 < = k < = n. In the aspect of wireless electric energy transmission, the number of turns of coils connected to a circuit and the number of compensation capacitors can be changed by directly moving the position of the sliding rod according to the requirements of actual application scenes. The number of turns of the coil can be adjusted at will within the range of 1-n, and therefore the requirements of different devices for charging power can be met in the mode that the number of turns of the coil of the receiving end is adjusted.

Description

Technical Field

[0001] The present application belongs to the field of wireless power transmission, and in particular to a sliding tap coil with variable turns. Background Art

[0002] The radio transmission coil is one of the key components of power transmission. It completes the wireless power transmission of the device based on the principle of electromagnetic induction. The size of the radio transmission coil not only affects the effect of power transmission, but also affects the power of power transmission. The power of power transmission is determined by the electromagnetic field between the transmitting coil and the receiving coil. The size of the coil affects the distribution of the electromagnetic field, thereby affecting the power transmission efficiency. Generally speaking, the larger the radio transmission coil, the higher the power transmission efficiency. However, too many turns of the coil will also cause unstable signal transmission and affect the power transmission effect.

[0003] The number of turns of the radio transmission coil needs to be determined according to the specific transmission needs and occasions, in order to ensure both the speed and efficiency of power transmission and the stability of signal transmission. The existing technology for adjusting the number of coil turns is still relatively traditional. Usually, a more suitable fixed coil is selected for the corresponding scenario. If the power transmission power of the usage scenario changes, a new coil is replaced. Most of the existing electromagnetic induction coils are not easy to disassemble and install, the number of coil turns cannot be adjusted, and the scope of application is small. Therefore, there is an urgent need for a convenient device with variable coil turns to be applied to occasions with different power transmission needs. This solves the complexity of selecting coils with different numbers of turns due to the need to consider the power transmission efficiency. Summary of the invention

[0004] In view of this, the present application aims to propose a sliding tap coil with variable turns to solve the complex problem caused by replacing the receiving end coil due to different transmission powers in different scenarios.

[0005] To achieve the above purpose, the technical solution of this application is implemented as follows:

[0006] The present application provides a sliding tap coil with variable turns, comprising a spiral structure and a sliding rod;

[0007] The sliding rod is divided into a contact and a long rod;

[0008] The contact part is made of conductive material, and the long rod is made of conductive metal and an outer insulating layer;

[0009] The spiral structure includes n≥2 turns of spiral coils with different diameters and a compensation capacitor;

[0010] The spiral coils are arranged in turns from the inside to the outside, and are named L iCoil, i=1, 2, 3, 4...n; except for a small part of each turn of the coil that is not wrapped by an insulating layer, the rest of the coil is wrapped by an insulating layer, the coil that is not wrapped by an insulating layer is connected to the sliding rod contact to form a closed loop, and the coil that is not wrapped by an insulating layer on each turn is on the same axis; the compensation capacitor is connected in series to each turn of the spiral coil, and the compensation capacitors of each turn are named C from the inside to the outside. i , i=1, 2, 3, 4...n;

[0011] The compensation capacitor is connected in series in each coil turn, satisfying the formula The resonant frequency is constant. If the sliding rod is moved, the number of turns of the spiral coil decreases and the capacitance in series decreases, that is, L decreases and C increases; if the sliding rod is moved, the number of turns of the spiral coil increases and the capacitance in series increases, that is, L increases and C decreases, satisfying the resonance condition.

[0012] Furthermore, in the use state, according to the number of coil turns k that need to be connected to the circuit, the end of the sliding rod is moved to the kth exposed coil to connect the k-turn coil to the external power supply through the sliding rod, thereby changing the number of coil turns connected to the circuit by changing the position of the sliding rod, and the variable range of the coil k is 1≤k≤n;

[0013] The central lead wire of the spiral coil serves as the end connected to the external power supply of the present invention, and the other end is led out from the tail of the long rod of the sliding rod;

[0014] Further, a plurality of the compensation capacitors are connected in series in each turn of the spiral coil, or

[0015] A plurality of the compensation capacitors are connected in parallel to the long rod of the sliding rod and the lead-out wire at the center of the spiral coil;

[0016] Furthermore, the shape of the spiral coil can be a flat circle, an ellipse, a square, or

[0017] Three-dimensional spiral shape;

[0018] Furthermore, the contact between the contact portion of the sliding rod and the spiral coil not wrapped by the insulating layer may be surface contact or plug-in contact.

[0019] Compared with the prior art, the sliding tap coil with variable turns described in the present application has the following beneficial effects:

[0020] The sliding-type variable-turn tap coil described in the present application can change the number of coil turns and the number of compensation capacitors connected to the circuit in terms of wireless power transmission according to the needs of the actual application scenario by directly moving the position of the sliding rod. The number of turns of the coil can be adjusted arbitrarily in the range of 1 to n, thereby being able to meet the charging power requirements of different devices by adjusting the number of turns of the receiving end coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 This is a schematic diagram of a sliding tapped coil with variable turns according to an embodiment of the present application;

[0023] Figure 2 This is an equivalent circuit diagram of a sliding tapped coil with variable turns according to an embodiment of the present application;

[0024] Figure 3 This is a schematic diagram of a structure in which the transmitting end is a single coil and the receiving end is a tapped coil with a variable number of turns in one embodiment of the present application;

[0025] Figure 4 This is a schematic diagram of a tapped coil structure in which both the transmitting end and the receiving end are variable in number of turns according to an embodiment of the present application;

[0026] Figure 5 This is a schematic diagram of a sliding tap coil with variable turns according to another embodiment of the present application;

[0027] Figure 6 This is an equivalent circuit diagram of a sliding tap coil with variable turns according to another embodiment of the present application;

[0028] Description of reference numerals:

[0029] 1- spiral structure; 11- spiral coil; 12- compensation capacitor; 2- sliding rod; 21- contact; 22- long rod; 111- exposed coil.

[0030] Specific implementation methods

[0031] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0032] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] See also Figure 1 As shown, this embodiment provides a sliding tap coil with variable turns, including a spiral structure 1 and a sliding rod 2;

[0034] The sliding rod 2 includes a contact 21 and a long rod 22;

[0035] The spiral structure 1 includes n≥2 turns of spiral coils 11 with different diameters and a compensation capacitor 12;

[0036] The spiral coil 11 is arranged in turns from inside to outside on the x0y plane, and is named Lth, i Coil, i = 1, 2, 3, 4...n; the outside of the coil is wrapped by an insulating layer, and there is a compensation capacitor 12 on each turn of the coil connected in series with the spiral coil 11. The compensation capacitors 12 of each turn are named C from inside to outside. i , i=1, 2, 3, 4...n. And there is an exposed coil 111 in each turn of the coil, and each exposed coil 111 is on the same axis. The sliding rod 1 is parked on the upper part of the spiral coil 11, and the contact 21 of the sliding rod 2 slides at each exposed coil 111 to change the number of coil turns and the number of compensation capacitors 12. In the use state, according to the number of coil turns k that need to be connected to the circuit, the end of the sliding rod 2 is moved to the kth exposed coil 111 to connect the k-turn coil to the external power supply through the sliding rod 2, so that the number of coil turns connected to the circuit is changed by changing the position of the sliding rod 2, and the variable range of the coil k is 1≤k≤n;

[0037] The equivalent circuit diagram of the device described in this application is as follows Figure 2 As shown. 1 , C 2 , C 3 , C 4 Corresponding to spiral coil 11, L1 , L 2 , L 3 , L 4 The compensation capacitor 12 in. Figure 1 The part of the spiral coil 11 in contact with the sliding rod 2 is represented by a switch S in this circuit diagram, wherein S1, S2, S3, and S4 represent the contacts with L 1 , L 2 , L 3 , L 4 The exposed coil 111 contacts the exposed coil 111. When the switch S1 is closed, the contact 21 of the sliding rod 2 and the L 1 The exposed coil 111 contacts, at this time L 1 and C 1 A resonant circuit is formed; when the sliding rod 2 and L 2 When the exposed part on the upper part touches, it means that switch S2 is closed and S1 is open. 1 With L 2 In series, if the resonance formula is to be satisfied The compensation capacitor 12 needs to be reduced, so the compensation capacitor C in series in L2 2 This plays a role in reducing the resonant capacitance; by analogy, when switch S4 is closed, S1, S2, and S3 are disconnected, and all capacitors and inductors are connected in series to form a resonant circuit.

[0038] In any state, before and after adjusting the number of turns of the spiral coil, the inductance and capacitance values ​​meet the resonance requirements at the preset frequency, as follows:

[0039]

[0040] In the equation, f represents the preset resonant frequency.

[0041] For specific coupling scenarios where the transmitter uses a single coil structure and the receiver uses a variable coil structure, see Figure 3 The number of turns of the transmitting coil remains unchanged. When the contact 21 of the receiving end sliding rod 2 is located at the outermost layer, the coils participating in energy transmission at the receiving end are L 4 , the capacitor is C 4 , at this time the mutual inductance between the receiving end and the transmitting end is M 1 When the contact 21 of the receiving end sliding rod 2 moves toward the middle of the spiral coil 11 in sequence, the coils of the receiving end spiral coil 11 participating in energy transmission increase L in sequence. 3 , L 2 , L 1 , the compensation capacitor increases in sequence C 3 , C 2 , C 1， The mutual inductance generated by the receiving and transmitting coils is from M 2 To M nThe inductance and capacitance of the receiving end spiral coil 11 meet the following resonance requirements:

[0042]

[0043]

[0044] For specific coupling scenarios where both the transmitter and receiver use variable coil structures, see Figure 4 Compared to Figure 3 The single side of the coil with variable turns is shown. Figure 4 When the contacts 21 of the transmitting end and the receiving end sliding rod 2 are both located at the outermost layer, the coils on both sides that participate in energy transmission are L t4 , L r4 , the capacitances are C t4 , C r4 , at this time the mutual inductance between the receiving end and the transmitting end is M 1 When the contact 21 of the transmitting end sliding rod 2 slides inwards for one turn and the contact 21 of the receiving end sliding rod 2 is located at the outermost layer, the coils on both sides that participate in energy transmission are L t4 , L t3 , L r4 , the capacitances are C t4 , C t3 , C r4 , at this time the mutual inductance between the receiving end and the transmitting end is M 2 Move the receiving end and the transmitting end sliding rod 2 in turn, and the mutual inductance generated between them changes from M to 2 To M n Changes between.

[0045] The inductance and capacitance of the transmitting and receiving spiral coils 11 meet the following resonance requirements:

[0046]

[0047]

[0048]

[0049] A schematic diagram of a sliding variable turns tap coil structure according to another scheme is shown in Figure 5 Compared with the embodiment 1, the compensation capacitor 12 connected in series is changed to be connected in parallel to the spiral coil 11 and the end of the sliding rod 22. One end of the compensation capacitor 12 is connected to the coil L 1 The other end is connected to the end lead of the sliding rod 2. When the sliding rod 2 is in contact with L 1When the exposed coil 111 moves toward the exposed spiral coil at the back, the number of parallel compensation capacitors 12 decreases, thereby satisfying the requirement of decreasing capacitance and increasing inductance to keep the resonant frequency constant.

[0050] Figure 6 As shown in FIG. 1 , it is an equivalent circuit diagram of another embodiment, in which the position of the compensation capacitor 12 is determined by the position of L 1 , L 2 , L 3 , L 4 The series connection is changed to parallel connection between the spiral coil 11 and the sliding rod 21. For easier observation, the switch S1 in the figure represents the spiral coil L 1 The exposed part contacts the end of the sliding rod. The double switches S2, S3, and S4 represent L 2 , L 3 , L 4 The part that contacts the end of the sliding rod. The implementation process is as follows: Under normal circumstances, S1 is disconnected, and the double switches S2, S3, and S4 are closed on it. When the sliding rod 1 is at L 1 When the coil 111 is exposed, it is similar to S1 being closed, L 1 With C 1 , C 2 , C 3 , C 4 Parallel resonance is formed. When the sliding rod 1 is at L 2 The exposed coil 111, that is, the double switch S2 is closed from the top to the bottom, which is L 1 , L 2 Series followed by C 2 , C 3 , C 4 By analogy, the circuit diagram can reflect that the device can still form a resonant circuit when the number of coil turns can be freely adjusted.

Claims

1. A sliding tap coil with variable turns, characterized in that: It includes a spiral structure and a sliding rod; The sliding rod is divided into a contact and a long rod; The contact part is made of conductive material, and the long rod is made of conductive metal and an outer insulating layer; The spiral structure includes n≥2 turns of spiral coils with different diameters and a compensation capacitor; The spiral coils are arranged in turns from the inside to the outside, and are named L i Coil, i=1, 2, 3, 4...n; each turn of the coil has a small part of the coil without insulation layer, and the rest of the coil is wrapped with insulation layer, the coil without insulation layer is connected with the sliding rod contact to form a closed loop, and the coil without insulation layer on each turn is on the same axis; the compensation capacitor is connected in series to each turn of the spiral coil, and the compensation capacitors of each turn are named C from inside to outside. i , i=1, 2, 3, 4...n.

2. A sliding type tapped coil with variable turns according to claim 1, characterized in that: The compensation capacitor is connected in series in each coil turn, satisfying the formula Under the condition of constant resonant frequency, if the sliding rod is moved, the number of turns of the spiral coil decreases and the capacitance in series decreases, that is, L decreases and C increases; if the sliding rod is moved, the number of turns of the spiral coil increases and the capacitance in series increases, that is, L increases and C decreases, satisfying the resonance condition.

3. A sliding type tapped coil with variable turns according to claim 2, characterized in that: In use, according to the number of coil turns k that need to be connected to the circuit, the contact of the sliding rod is moved to the kth exposed coil to connect the k-turn coil to the external power supply through the sliding rod, thereby changing the number of coil turns connected to the circuit by changing the position of the sliding rod, and the variable range of the coil k is 1≤k≤n.

4. The sliding type tapped coil with variable turns according to claim 1, characterized in that: The central lead wire of the spiral coil serves as the end connected to the external power supply of the present invention, and the other end is led out from the long rod tail of the sliding rod.

5. The sliding type tapped coil with variable turns according to claim 2, characterized in that: A plurality of compensation capacitors are connected in series in each turn of the spiral coil, or A plurality of compensation capacitors are connected in parallel to the long rod of the sliding rod and the lead-out wire at the center of the spiral coil.

6. A sliding tapped coil with variable turns according to claim 2, characterized in that: The shape of the spiral coil can be flat circular, oval, square, or Three-dimensional spiral shape.

7. The sliding type tapped coil with variable turns according to claim 4, characterized in that: The contact between the contact portion of the sliding rod and the spiral coil without insulation layer can be surface contact or insertion contact.

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