Multi-relay wireless power transmission system based on switched capacitor matrix

Abstract

The utility model provides a multi-relay wireless power transmission system based on a switched capacitor matrix, and belongs to the technical field of wireless power transmission. A controllable switch capacitor matrix CP1 in a resonance network module in the multi-relay wireless power transmission system based on the switch capacitor matrix comprises a plurality of fixed value capacitors and a plurality of switch tubes, and each fixed value capacitor is connected in series with two switch tubes which are reversely connected in series. And the fixed value capacitor and the two switching tubes which are connected in series reversely form a group and are connected in parallel to form a switched capacitor matrix. One end of the formed switched capacitor matrix is connected with the other end of the coil Lp2, one end of the coil Lp2 is connected with the source electrode of the switching tube S1, and the other end of the formed switched capacitor matrix is connected with the equivalent resistor RP of the transmitting coil module Lp1. The utility model solves the problems in the prior art that the process of replacing the battery is tedious, and a large amount of manpower and cost are required to be invested.

Description

TECHNICAL FIELD

[0001] The utility model belongs to wireless power transmission technical field, concretely relates to multi-relay wireless power transmission system based on switching capacitor matrix. BACKGROUND

[0002] Wireless power transmission is a kind of transmission mode that does not pass through wire direct contact and transmits electric energy from one end to another end, solves circuit friction aging, and the problems such as easy electric spark and high-voltage electric shock, has the advantages of safety, reliability and low maintenance cost.

[0003] At present, along with the rapid development of power grid, the electric power system of our country almost covers the whole country.But, transmission and distribution line is usually directly exposed in the open air, the distribution range is wide, the line distance is long, and the geographical environment and climate environment are complex and changeable, especially in mountain landslide and flood-prone areas and under the condition of encountering ice and snow and thunderstorm and other extremely severe weather conditions, it is easy to be damaged.Once a part of line appears the problem, will lead to a series of chain reaction, and when the problem is serious, even can cause partial or whole power grid to fall into the paralysis state and bring huge loss to national economic development.However, the on-line monitoring equipment of transmission line can carry out all-around and multifunctional real-time monitoring to the working state of transmission line, especially in severe climate or external environment, the use of on-line monitoring equipment of transmission line not only can feedback monitoring information in time, but also can reduce the loss caused by transmission and distribution line damage.

[0004] At present, the on-line monitoring equipment of transmission line usually adopts the power supply mode of traditional UPS (Uninterruptible Power Supply, uninterrupted power supply) battery and solar panel.Because the service life of battery is short, and there are many monitoring nodes in high-voltage transmission line, leading to the process of replacing battery is more cumbersome, needs to invest a lot of manpower and cost, simultaneously, the power supply mode of traditional UPS battery and solar panel also has such as limited load capacity, is limited by special terrain and design complex cost and other restriction factors, this also makes the traditional power supply mode (UPS battery and solar panel) more and more difficult to adapt to the development trend of on-line monitoring equipment expansion of transmission line. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of multi-relay wireless power transmission system based on switching capacitor matrix, to solve the problem of the process of replacing battery in prior art is more cumbersome, needs to invest a lot of manpower and cost.

[0006] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] The utility model provides a kind of multi-relay wireless power transmission system based on switch capacitor matrix, including direct current power supply, inverter module, resonant network module, transmitting coil module L p1 , first relay coil module, second relay coil module, receiving coil module and rectifier module.

[0008] The input of the inverter module is connected to the direct current power supply, the output of the inverter module is connected to the input of the resonant network module, the output of the resonant network module is connected to the input of the transmitting coil module L p1 The output of the transmitting coil module L p1 is oppositely arranged with the input of the first relay coil module, the output of the first relay coil module is oppositely arranged with the input of the second relay coil module, the output of the second relay coil module is oppositely arranged with the input of the receiving coil module, the output of the receiving coil module is connected to the input of the rectifier module, and the output of the rectifier module is connected to the load.

[0009] The resonant network module comprises a coil L p2 , a controllable switch capacitor matrix C P1 and a fixed capacitor C P2 One end of the fixed capacitor C P2 is connected to the other end of the coil L p2 , and the other end of the fixed capacitor C P2 is connected to the transmitting coil module L p1 .

[0010] The controllable switch capacitor matrix C P1 comprises a plurality of fixed capacitors and a plurality of switch tubes, each fixed capacitor is connected in series with two switch tubes connected in reverse, the fixed capacitor and the two switch tubes connected in reverse constitute a group connected in parallel, forming a switch capacitor matrix.

[0011] One end of the switch capacitor matrix is connected to the other end of the coil L p2 , one end of the coil L p2 is connected to the source of the switch tube S1, and the other end of the switch capacitor matrix is connected to the equivalent resistance R p1 of the transmitting coil module L P .

[0012] The utility model further improves in that the model of the fixed capacitor C P2 and the plurality of fixed capacitors is not limited.

[0013] The further improvement of the utility model lies in that the drain electrode of one of the two reversely connected switch tubes is connected with a constant value capacitor, the drain electrodes of the other of the two reversely connected switch tubes are connected with each other, the source electrode of one of the two reversely connected switch tubes is connected with the source electrode of the other of the two reversely connected switch tubes, and the gate electrodes of each of the two reversely connected switch tubes are connected with the corresponding switch tube driving circuit.

[0014] The further improvement of the utility model lies in that the switch tubes are all MOSFET.

[0015] The further improvement of the utility model lies in that the inverter module comprises switch tube S1, switch tube S2, switch tube S3 and switch tube S4, the drain electrode of switch tube S1 is connected with the drain electrode of switch tube S3, the source electrode of switch tube S3 is connected with the drain electrode of switch tube S4, the source electrode of switch tube S4 is connected with the source electrode of switch tube S2, the drain electrode of switch tube S2 is connected with the source electrode of switch tube S1, and the gate electrodes of switch tube S1, switch tube S2, switch tube S3 and switch tube S4 are connected with the corresponding switch tube driving circuit.

[0016] The further improvement of the utility model lies in that the switch tube S1, switch tube S2, switch tube S3 and switch tube S4 are all MOSFET.

[0017] The further improvement of the utility model lies in that the rectifier module comprises diode D1, diode D2, diode D3 and diode D4, the cathode of diode D1 is connected with the cathode of diode D3, the anode of diode D3 is connected with the cathode of diode D4, the anode of diode D4 is connected with the anode of diode D2, and the cathode of diode D2 is connected with the anode of diode D1.

[0018] The further improvement of the utility model lies in that the cathode of diode D3 and the anode of diode D4 are further connected with filter capacitor C L .

[0019] The further improvement of the utility model lies in that the diode D1, diode D2, diode D3 and diode D4 are all rectifier diodes.

[0020] The further improvement of the utility model lies in that the model of filter capacitor C L is not limited.

[0021] Compared with the prior art, the utility model has the beneficial effects that:

[0022] Compared with the existing switch capacitor matrix multi-relay wireless electric energy transmission system, the resonant network module in the switch capacitor matrix multi-relay wireless electric energy transmission system provided by the utility model utilizes a plurality of fixed value capacitors and a plurality of switch tubes to design a switch capacitor matrix, when the switch tube is closed, the corresponding capacitor is connected into the circuit and used as a resonant capacitor. Under the condition of load change, according to the difference of input frequency of the input end, the switch tube in series with the corresponding required capacitor under the frequency is given a trigger signal, so that the required resonant capacitor under the frequency starts to work, so that the switch capacitor matrix multi-relay wireless electric energy transmission system can reach the highest transmission efficiency, and the transmission system of the utility model does not need to frequently replace the battery, saves manpower and cost, improves the transmission efficiency, thereby effectively solving the problem that the process of replacing the battery in the prior art is relatively complicated and a large amount of manpower and cost needs to be invested. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The circuit diagram of the switch capacitor matrix multi-relay wireless electric energy transmission system based on the utility model;

[0024] Figure 2 The circuit diagram of the switch capacitor matrix based on the utility model. DETAILED DESCRIPTION

[0025] In order to further understand the content of the utility model, the utility model is described in detail below in combination with the drawings and specific embodiments. It should be understood that the embodiments are only used to explain the utility model and are not limited.

[0026] The switch capacitor matrix multi-relay wireless electric energy transmission system based on the utility model designs a resonant network module, and the controllable switch capacitor matrix C P1 includes a plurality of fixed value capacitors and a plurality of switch tubes, each fixed value capacitor is connected in series with two switch tubes connected in reverse, the fixed value capacitor and the two switch tubes connected in reverse constitute a group connected in parallel, and constitute a switch capacitor matrix. Compared with the prior art, the utility model effectively solves the problem that the process of replacing the battery in the prior art is relatively complicated and a large amount of manpower and cost needs to be invested.

[0027] Embodiment 1:

[0028] The embodiment discloses a switch capacitor matrix multi-relay wireless electric energy transmission system, and the circuit diagram of the switch capacitor matrix multi-relay wireless electric energy transmission system based on the embodiment is as shown in Figure 1 , Figure 1 L S is a receiving coil L s self-inductance, M i j (i, j ∈ N*) is the mutual inductance between coil i and coil j, is the output current of the inverter module, is the transmitting coil current vector, and is the relay coil L1 and L2 current vector, is the receiving coil L s current vector, R P , R1, R2 and R3 are the equivalent internal resistances of each coil, and the technical scheme of the utility model is specifically described as follows:

[0029] The embodiment of the utility model is based on a multi-relay wireless power transmission system of switch capacitor matrix, which comprises a direct current power supply U, an inverter module, a resonance network module, a transmitting coil module (coil L p1 ), a first relay coil module (coil L1), a second relay coil module (coil L2), a receiving coil module (coil L s ) and a rectifier module.

[0030] The input of the inverter module is connected with the direct current power supply U, the output (U s ) of the inverter module is connected with the input of the resonance network module, the output of the resonance network module is connected with the input of the transmitting coil module L p1 , the output of the transmitting coil module L p1 is arranged opposite to the input of the first relay coil module, the output of the first relay coil module is arranged opposite to the input of the second relay coil module, the output of the second relay coil module is arranged opposite to the input of the receiving coil module, the output of the receiving coil module is connected with the input of the rectifier module, and the output of the rectifier module is connected with the load R L .

[0031] The resonance network module comprises a coil L p2 , a controllable switch capacitor matrix C P1 and a fixed value capacitor C P2 , one end of the fixed value capacitor C P2 is connected with the other end of the coil L p2 , and the other end of the fixed value capacitor C P2 is connected with the transmitting coil module L p1 .

[0032] The controllable switch capacitor matrix C P1The switch capacitor matrix is composed of a plurality of fixed value capacitors and a plurality of switch tubes, each fixed value capacitor is connected with two switch tubes in reverse series, the fixed value capacitor and the two switch tubes in reverse series form a group connected in parallel, and the switch capacitor matrix is formed.

[0033] The controllable switch capacitor matrix C of the embodiment P1 includes four fixed value capacitors (C a , C b , C c and C d ) and eight switch tubes (SW1, SW2, SW3, SW4, SW5, SW6, SW7 and SW8). In the embodiment, the plurality of switch tubes are MOSFETs. The type of the fixed value capacitor C P2 and the plurality of fixed value capacitors is not limited.

[0034] One end of the switch capacitor matrix formed by the plurality of fixed value capacitors and the plurality of switch tubes is connected to the other end of the coil L p2 , one end of the coil L p2 is connected to the source electrode of the switch tube S1, and the other end of the switch capacitor matrix formed by the plurality of fixed value capacitors and the plurality of switch tubes is connected to the equivalent resistance R p1 of the transmitting coil module L P . The circuit diagram of the switch capacitor matrix formed by the plurality of fixed value capacitors and the plurality of switch tubes is shown in Figure 2 .

[0035] The inverter module includes the switch tube S1, the switch tube S2, the switch tube S3 and the switch tube S4, the drain electrode of the switch tube S1 is connected to the drain electrode of the switch tube S3, the source electrode of the switch tube S3 is connected to the drain electrode of the switch tube S4, the source electrode of the switch tube S4 is connected to the source electrode of the switch tube S2, the drain electrode of the switch tube S2 is connected to the source electrode of the switch tube S1, and the gate electrodes of the switch tube S1, the switch tube S2, the switch tube S3 and the switch tube S4 are connected to the corresponding switch tube driving circuit. The switch tube S1, the switch tube S2, the switch tube S3 and the switch tube S4 are all MOSFETs.

[0036] The rectifier module includes the diode D1, the diode D2, the diode D3 and the diode D4, the cathode of the diode D1 is connected to the cathode of the diode D3, the anode of the diode D3 is connected to the cathode of the diode D4, the anode of the diode D4 is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the anode of the diode D1. The diode D1, the diode D2, the diode D3 and the diode D4 are all rectifier diodes.

[0037] The cathode of diode D3 and the anode of diode D4 are also connected in parallel with a filter capacitor C L for filtering. The model of the filter capacitor C L is not limited.

[0038] The working principle of the multi-relay wireless power transmission system based on the switch capacitor matrix is described as follows:

[0039] When the multi-relay wireless power transmission system based on the switch capacitor matrix is working, the inverter module composed of switch S1, switch S2, switch S3 and switch S4 inverts the direct current power supply U into alternating current, and then inputs the inverted alternating current into the resonance network module composed of coil L p2 , controllable switch capacitor matrix C P1 (controllable switch capacitor matrix C P1 includes a plurality of fixed value capacitors and a plurality of switches) and fixed value capacitor C P2 , and the current after the elimination of the reactive component by the resonance network module generates electromagnetic induction through coil L P1 , the energy generated by the electromagnetic induction is transmitted to the relay coil L1 through the magnetic field, and then the relay coil L1 generates current in the relay coil L1 through electromagnetic induction, and then continues to transmit energy to the next relay coil L2 and the receiving coil L S . In the case of increasing the relay coil, the transmitting coil L p1 can transmit energy to a farther distance. After receiving the transmitted magnetic field, the receiving coil L S obtains induced current through electromagnetic induction S The current obtained at this time is alternating current, which is rectified by the rectifier module composed of diode D1, diode D2, diode D3 and diode D4, and then filtered by capacitor C L , and the current after the final filtering is the load R L for power supply (the load R L is the device that needs to be powered).

[0040] In the case of changing the load, the multi-relay wireless power transmission system based on the switch capacitor matrix gives the MOSFET trigger signal in series with the corresponding required capacitor at the frequency of the input end, so that the required resonance capacitor at this frequency starts to work, so that the multi-relay wireless power transmission system based on the switch capacitor matrix can achieve the highest transmission efficiency.

[0041] The controllable switch capacitor matrix C P1 of the embodiment has the following four working modes, which are described in detail as follows:

[0042] ​Mode 1: When the switch tube SW1, the switch tube SW2, the switch tube SW3 and the switch tube SW4 are turned on, the switch tube SW5, the switch tube SW6, the switch tube SW7 and the switch tube SW8 are not turned on, the current can flow in the positive direction (namely from top to bottom) through the fixed value capacitor (C a , b , c and C d ) attached with the diode of the switch tube SW1, the switch tube SW2, the switch tube SW3 and the switch tube SW4 and the switch tube SW5, the switch tube SW6, the switch tube SW7 and the switch tube SW8, and the fixed value capacitor (C a , b , c and C d ) is turned on and works. If the current is reversed, the controllable switch capacitor matrix C P1 cannot work.

[0043] Mode 2: When the switch tube SW1, the switch tube SW2, the switch tube SW3, the switch tube SW4, the switch tube SW5, the switch tube SW6, the switch tube SW7 and the switch tube SW8 are not turned on, the controllable switch capacitor matrix C P1 is disconnected.

[0044] Mode 3: When the switch tube SW5, the switch tube SW6, the switch tube SW7 and the switch tube SW8 are turned on, the switch tube SW1, the switch tube SW2, the switch tube SW3 and the switch tube SW4 are not turned on, the current can flow in the reverse direction (namely from bottom to top) through the switch tube SW5, the switch tube SW6, the switch tube SW7, the switch tube SW8, the switch tube SW1, the switch tube SW2, the switch tube SW3 and the switch tube SW4 attached with the diode and the fixed value capacitor (C a , b , c and C d ), and the fixed value capacitor (C a , b , c and C d ) is turned on and works. If the current is reversed, the controllable switch capacitor matrix C P1 cannot work.

[0045] Mode 4: When the switch tube SW1, the switch tube SW2, the switch tube SW3, the switch tube SW4, the switch tube SW5, the switch tube SW6, the switch tube SW7 and the switch tube SW8 are all turned on, the current in the positive direction and the current in the reverse direction can all flow, and the controllable switch capacitor matrix C P1 works normally.

[0046] The use method of the multi-relay wireless electric energy transmission system based on the switch capacitor matrix comprises the following steps:

[0047] Invert the direct current power into alternating current through the inverter module;

[0048] Eliminate the reactive component of the obtained alternating current through the capacitor matrix composed of several fixed capacitors and several switches in the resonance network module to the multi-relay wireless power transmission system based on the switching capacitor matrix, and obtain the alternating current after eliminating the reactive component;

[0049] Rectify and filter the alternating current after eliminating the reactive component through the rectifier module and the filter module, and finally output the direct current;

[0050] Use the finally output direct current to supply power to different loads.

[0051] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, but not to limit it, although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that: the specific embodiments of the present application can still be modified or replaced, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered within the protection scope of the claims of the present application.

Claims

1. A switched-capacitor matrix based multi-relay wireless power transfer system, characterized in that, The direct current power supply, the inverter module, the resonance network module, the transmitting coil module L p1 , the first relay coil module, the second relay coil module, the receiving coil module and the rectifier module The input of the inverter module is connected with the direct current power supply, the output of the inverter module is connected with the input of the resonant network module, the output of the resonant network module is connected with the input of the transmitting coil module L p1 , the output of the transmitting coil module L p1 is opposite to the input of the first relay coil module, the output of the first relay coil module is opposite to the input of the second relay coil module, the output of the second relay coil module is opposite to the input of the receiving coil module, the output of the receiving coil module is connected with the input of the rectifier module, and the output of the rectifier module is connected with the load. The resonant network module comprises a coil L p2 , a controllable switch capacitor matrix C P1 , and a fixed capacitor C P2 , one end of the fixed capacitor C P2 is connected to the other end of the coil L p2 , and the other end of the fixed capacitor C P2 is connected to the transmitting coil module L p1 ; The controllable switched-capacitor matrix C P1 The switched-capacitor matrix comprises a plurality of fixed-value capacitors and a plurality of switching tubes, each fixed-value capacitor is connected in series with two switching tubes connected in anti-series, the fixed-value capacitor and the two switching tubes connected in anti-series form a group connected in parallel, and the groups are connected in parallel. One end of the coil L p2 is connected to one end of the switched capacitor matrix p2 , and the other end of the coil L p2 is connected to the source of the switching transistor S1 p2 , and the other end of the switched capacitor matrix is connected to the equivalent resistance R P of the transmitting coil module L p1 .

2. The switched-capacitor matrix-based multi-relay wireless power transfer system of claim 1, wherein, Fixed value capacitor C P2 The model of the fixed value capacitors C is not limited.

3. The switched-capacitor matrix-based multi-relay wireless power transfer system of claim 1, wherein, The drain of one of the two reversely connected switch tubes is connected with a fixed capacitor, the drains of the other of the two reversely connected switch tubes are connected with each other, the source of one of the two reversely connected switch tubes is connected with the source of the other of the two reversely connected switch tubes, and the gate of each of the two reversely connected switch tubes is connected with a corresponding switch tube driving circuit.

4. The switched-capacitor matrix-based multi-relay wireless power transfer system of claim 1, wherein, The switch tubes are MOSFETs.

5. The switched-capacitor matrix-based multi-relay wireless power transfer system of claim 1, wherein, The inverter module comprises switch tubes S1, S2, S3 and S4, the drain of the switch tube S1 is connected with the drain of the switch tube S3, the source of the switch tube S3 is connected with the drain of the switch tube S4, the source of the switch tube S4 is connected with the source of the switch tube S2, the drain of the switch tube S2 is connected with the source of the switch tube S1, and the gates of the switch tubes S1, S2, S3 and S4 are connected with corresponding switch tube driving circuits.

6. The switched-capacitor matrix-based multi-relay wireless power transfer system of claim 5, wherein, The switch tubes S1, S2, S3 and S4 are MOSFETs.

7. The switched-capacitor matrix-based multi-relay wireless power transfer system of claim 1, wherein, The rectifier module comprises diodes D1, D2, D3 and D4, the cathode of the diode D1 is connected with the cathode of the diode D3, the anode of the diode D3 is connected with the cathode of the diode D4, the anode of the diode D4 is connected with the anode of the diode D2, and the cathode of the diode D2 is connected with the anode of the diode D1.

8. The switched-capacitor matrix-based multi-relay wireless power transfer system of claim 7, wherein, The cathode of diode D3 and the anode of diode D4 are also connected in parallel to a filter capacitor C L .

9. The switched-capacitor matrix-based multi-relay wireless power transfer system of claim 7, wherein, The diodes D1, D2, D3 and D4 are rectifier diodes.

10. The switched-capacitor matrix-based multi-relay wireless power transfer system of claim 8, wherein, Filter capacitor C L The model of the filter capacitor C is not limited.

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