Multi-relay wireless electric energy transmission system based on switched capacitor and use method of multi-relay wireless electric energy transmission system

Abstract

The invention provides a switched capacitor-based multi-relay wireless power transmission system and a use method thereof, and belongs to the technical field of wireless power transmission. One end of a constant-value capacitor Cb in a resonance network module in the multi-relay wireless power transmission system based on the switched capacitor is connected with the other end of a coil Lp2, one end of the coil Lp2 is connected with a source electrode of a switching tube S1, the other end of the constant-value capacitor Cb is connected with a drain electrode of a switching tube Q1, the drain electrode of the switching tube Q1 is connected with one end of a constant-value capacitor Ca, and the other end of the constant-value capacitor Ca is connected with the source electrode of the switching tube S1. The source electrode of the switch tube Q1 is connected with the drain electrode of the switch tube Q2, the source electrode of the switch tube Q2 is connected with the other end of the fixed value capacitor Ca, and the grid electrode of the switch tube Q1 and the grid electrode of the switch tube Q2 are connected with corresponding switch tube driving circuits. The problems that in the prior art, the battery replacement process is tedious, and a large amount of manpower and cost need to be input are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless power transmission, and in particular relates to a multi-relay wireless power transmission system based on switched capacitors and a use method thereof. Background Art

[0002] Wireless power transmission is a transmission method that transmits electrical energy from one end to another without direct contact of wires. It solves problems such as circuit friction aging, easy generation of electric sparks and high-voltage electric shock. It has the advantages of safety, reliability and low maintenance cost.

[0003] At present, with the rapid development of power grids, my country's power system covers almost the entire country. However, transmission and distribution lines are usually directly exposed in the wild, with a wide distribution range, long line distances, and complex and changeable geographical and climatic environments. They are particularly vulnerable to damage in areas prone to landslides and floods, as well as in extremely severe weather conditions such as ice, snow, and thunderstorms. Once a problem occurs in a part of the line, it will lead to a series of chain reactions. When the problem is serious, it may even cause a partial or entire power grid to be paralyzed, causing huge losses to the national economic development. However, the online monitoring equipment for transmission lines can conduct all-round and multifunctional real-time monitoring of the working status of transmission lines, especially in harsh climates or external environments. The use of online monitoring equipment for transmission lines can not only provide timely feedback of monitoring information, but also reduce the losses caused by damage to transmission and distribution lines.

[0004] At present, the transmission line online monitoring equipment usually adopts the traditional UPS (Uninterruptible Power Supply) battery and solar panel power supply mode. Due to the short power supply life of the battery and the large number of monitoring nodes in the high-voltage transmission line, the process of replacing the battery is relatively cumbersome, requiring a lot of manpower and cost. At the same time, the traditional UPS battery and solar panel power supply mode also has constraints such as limited load capacity, special terrain restrictions, complex design and high cost. This also makes the traditional power supply mode (UPS battery and solar panel) increasingly difficult to adapt to the development trend of the expansion of transmission line online monitoring equipment. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-relay wireless power transmission system based on switched capacitors and a method of using the same, so as to solve the problem in the prior art that the process of replacing batteries is complicated and requires a lot of manpower and cost.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a multi-relay wireless power transmission system based on switched capacitors, including a DC power supply, an inverter module, a resonant network module, a transmitting coil module, a first relay coil module, a second relay coil module, a receiving coil module and a rectifier module;

[0008] The DC power supply is connected to the input of the inverter module, 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, the output of the transmitting coil module is arranged relative to the input of the first relay coil module, the output of the first relay coil module is arranged relative to the input of the second relay coil module, the output of the second relay coil module is arranged relative to 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 includes a coil L p2 , controllable switch capacitor C P1 And fixed value capacitor C P2 , fixed value capacitor C P2 One end of the coil L is connected p2 The other end of the fixed capacitor C P2 The other end is connected to the transmitting coil module, and the controllable switch capacitor C P1 Including fixed value capacitor C a , fixed value capacitor C b , switch tube Q1 and switch tube Q2;

[0010] The fixed value capacitor C b One end of the coil L is connected p2 The other end of the coil L p2 One end of the capacitor is connected to the source of the switch tube S1, and the fixed value capacitor C b The other end is connected to the drain of the switch tube Q1, and the drain of the switch tube Q1 is connected to the fixed value capacitor C a The source of the switch tube Q1 is connected to the drain of the switch tube Q2, and the source of the switch tube Q2 is connected to the fixed value capacitor C a At the other end, the gate of the switch tube Q1 and the gate of the switch tube Q2 are connected to the corresponding switch tube driving circuit.

[0011] A further improvement of the present invention is that the fixed value capacitor C P2 , fixed value capacitor C a And fixed value capacitor C b There are no restrictions on models.

[0012] A further improvement of the present invention is that both the switch tube Q1 and the switch tube Q2 are MOSFETs.

[0013] A further improvement of the present invention is that the inverter module includes a switch tube S1, a switch tube S2, a switch tube S3 and a switch tube S4, the drain of the switch tube S1 is connected to the drain of the switch tube S3, the source of the switch tube S3 is connected to the drain of the switch tube S4, the source of the switch tube S4 is connected to the source of the switch tube S2, the drain of the switch tube S2 is connected to the source of the switch tube S1, and the gate of the switch tube S1, the gate of the switch tube S2, the gate of the switch tube S3 and the gate of the switch tube S4 are connected to the corresponding switch tube driving circuit.

[0014] A further improvement of the present invention is that the switch tube S1 , the switch tube S2 , the switch tube S3 and the switch tube S4 are all MOSFETs.

[0015] A further improvement of the present invention is that the rectifier module includes a diode D1, a diode D2, a diode D3 and a 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.

[0016] A further improvement of the present invention is that the cathode of the diode D3 and the anode of the diode D4 are connected in parallel with a filter capacitor C L .

[0017] A further improvement of the present invention is that the diode D1 , the diode D2 , the diode D3 and the diode D4 are all rectifier diodes.

[0018] A further improvement of the present invention is that the filter capacitor C L The model is not restricted.

[0019] In a second aspect, the present invention provides a method for using a multi-relay wireless power transmission system based on a switched capacitor, comprising the following steps:

[0020] Invert the DC power supply into AC through the inverter module;

[0021] The obtained alternating current is passed through the fixed capacitor Ca, the fixed capacitor Cb, the switch tube Q1 and the switch tube Q2 in the resonant network module to eliminate reactive components of the multi-relay wireless power transmission system based on the switch capacitor, and the alternating current after the reactive components are eliminated is obtained;

[0022] After the reactive component is eliminated, the AC current is rectified and filtered through a rectifier module and a filter module, and finally a DC current is output;

[0023] The final output DC current is used to power different loads.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention is an improved invention. Compared with the existing switched capacitor multi-relay wireless power transmission system, the resonant network module in the switched capacitor multi-relay wireless power transmission system proposed by the present invention is designed with a controllable switched capacitor C P1 , and the controllable switch capacitor C P1 The switch tube is also designed in part. By controlling the switch state of the switch tube, the equivalent resonant capacitor value is adjusted, so that the circuit parameters are adjusted in real time to adapt to the energy transmission requirements under different transmission distances and environmental conditions. Moreover, when supplying power to different loads, the present invention can dynamically adjust the capacitance so that the multi-relay wireless power transmission system of the entire switch capacitor can reach the state of maximum efficiency output, and there is no need to frequently replace the battery, which saves manpower and cost, improves the transmission efficiency, and effectively solves the problem that the process of replacing the battery in the prior art is relatively cumbersome and requires a lot of manpower and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A circuit diagram of a multi-relay wireless power transmission system based on switched capacitors according to the present invention;

[0027] Figure 2 The controllable switch capacitor C of the present invention P1 Circuit diagram of the . DETAILED DESCRIPTION

[0028] In order to further understand the content of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0029] The multi-relay wireless power transmission system based on switched capacitor proposed in the present invention designs a resonant network module, and the resonant network module designs a coil L p2 , controllable switch capacitor C P1 And fixed value capacitor C P2 , fixed value capacitor C P2 One end of the coil L is connected p2 The other end of the fixed capacitor C P2 The other end is connected to the transmitting coil module, and the controllable switch capacitor C P1 Including fixed value capacitor C a , fixed value capacitor C b , switch tube Q1 and switch tube Q2. Compared with the prior art, the present invention effectively solves the problem that the process of replacing batteries in the prior art is complicated and requires a lot of manpower and cost.

[0030] Embodiment 1:

[0031] This embodiment discloses a multi-relay wireless power transmission system based on switched capacitors. The circuit diagram of the multi-relay wireless power transmission system based on switched capacitors in this embodiment is as follows: Figure 1 As shown, Figure 1 Medium S The receiving coil L s Self-sensitivity, M ij (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 current vector of the relay coils L1 and L2, The receiving coil L s Current vector, R P , R1, R2 and R3 are equivalent internal resistances of each coil, and the technical solution of the present invention is specifically described as follows:

[0032] The multi-relay wireless power transmission system based on switched capacitors in this embodiment includes a DC power supply U, an inverter module, a resonant network module, a transmitting coil module (coil L p1 ), the first relay coil module (coil L1), the second relay coil module (coil L2), the receiving coil module (coil L s ) and rectifier module.

[0033] The DC power supply U is connected to the input of the inverter module, and the output of the inverter module (U s ) 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, the output of the transmitting coil module 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 to the input of the rectifier module, and the output of the rectifier module is connected to the load R L .

[0034] The resonant network module includes a coil L p2 , controllable switch capacitor C P1 And fixed value capacitor C P2 , fixed value capacitor C P2 One end of the coil L is connected p2 The other end of the fixed capacitor C P2 The other end is connected to the transmitting coil module, and the controllable switch capacitor C P1 Including fixed value capacitor C a , fixed value capacitor C b , switch tube Q1 and switch tube Q2.

[0035] Fixed value capacitor C b One end of the coil L is connectedp2 The other end of the coil L p2 One end is connected to the source of the switch tube S1, and the fixed value capacitor C b The other end is connected to the drain of the switch tube Q1, and the drain of the switch tube Q1 is connected to the fixed value capacitor C a The source of the switch tube Q1 is connected to the drain of the switch tube Q2, and the source of the switch tube Q2 is connected to the fixed value capacitor C a The other end of the switch tube Q1 and the gate of the switch tube Q2 are connected to the corresponding switch tube drive circuit. The switch tube Q1 and the switch tube Q2 are both MOSFETs, and the fixed value capacitor C P2 , fixed value capacitor C a And fixed value capacitor C b The models of controllable switch capacitor C P1 Related circuit diagrams such as Figure 2 shown.

[0036] The inverter module includes a switch tube S1, a switch tube S2, a switch tube S3 and a switch tube S4, the drain of the switch tube S1 is connected to the drain of the switch tube S3, the source of the switch tube S3 is connected to the drain of the switch tube S4, the source of the switch tube S4 is connected to the source of the switch tube S2, the drain of the switch tube S2 is connected to the source of the switch tube S1, and the gate of the switch tube S1, the gate of the switch tube S2, the gate of the switch tube S3 and the gate of the switch tube S4 are connected to the corresponding switch tube drive circuit. The switch tubes S1, S2, S3 and S4 are all MOSFETs.

[0037] The rectifier module includes a diode D1, a diode D2, a diode D3 and a diode D4, wherein 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.

[0038] The cathode of diode D3 and the anode of diode D4 are also connected in parallel with filter capacitor C L , used for filtering. Filter capacitor C L The model is not restricted.

[0039] The working principle of the multi-relay wireless power transmission system based on switched capacitors in this embodiment is described as follows:

[0040] When the multi-relay wireless power transmission system based on switched capacitors is working, the inverter module composed of switch tubes S1, S2, S3 and S4 inverts the DC power supply U into AC, and then inputs the inverted AC current into the coil L. p2 , controllable switch capacitor C P1(Controllable switch capacitor C P1 Including fixed value capacitor C a , fixed value capacitor C b , switch tube Q1 and switch tube Q2) and fixed value capacitor C P2 In the resonant network module, the current after the reactive component is eliminated by the resonant network module passes through the coil L P1 Electromagnetic induction is generated. After the energy generated by electromagnetic induction is transferred to the relay coil L1 through the magnetic field, the relay coil L1 generates current in the relay coil L1 through electromagnetic induction, and then continues to the next relay coil L2 and the receiving coil L S Transfer energy. When adding a relay coil, the transmitting coil L p1 Energy can be transferred to a longer distance. Receiving coil L S After receiving the transmitted magnetic field, the receiving coil L S Induced current is obtained by electromagnetic induction The current obtained at this time is an alternating current. After being rectified by a rectifier module composed of diodes D1, D2, D3 and D4, the alternating current is rectified by capacitor C L The current after filtering is the load R L Power supply (load R L for devices that require power).

[0041] In the case of load replacement, the multi-relay wireless power transmission system based on switched capacitors samples the output current, obtains the power through the multiplier and divider, and then corrects the difference between the given value and the calculated value through the controller (such as the MCU controller) to obtain the corrected signal, and transmits the corrected signal to the transmitting coil L p1 On one side, a new PWM driving signal is obtained by using a controller, and the new PWM signal is transmitted to the switch tubes Q1 and Q2 to change the duty cycle of the switch tubes Q1 and Q2, thereby achieving the change of the equivalent resonant capacitance value ( Figure 1 Middle C P1 , C P2 , C1 and C S The purpose of the multi-relay wireless power transmission system is to realize the dynamic adjustment of the switched capacitor, which can effectively offset the effects of signal attenuation and power loss, thereby maintaining the stability and reliability of the transmission efficiency of the multi-relay wireless power transmission system of the switched capacitor.

[0042] Embodiment 2:

[0043] This embodiment discloses a method for using a multi-relay wireless power transmission system based on a switched capacitor. The method for using a multi-relay wireless power transmission system based on a switched capacitor in this embodiment includes the following steps:

[0044] Invert the DC power supply into AC through the inverter module;

[0045] The obtained alternating current is passed through the fixed capacitor Ca, the fixed capacitor Cb, the switch tube Q1 and the switch tube Q2 in the resonant network module to eliminate reactive components of the multi-relay wireless power transmission system based on the switch capacitor, and the alternating current after the reactive components are eliminated is obtained;

[0046] After the reactive component is eliminated, the AC current is rectified and filtered through a rectifier module and a filter module, and finally a DC current is output;

[0047] The final output DC current is used to power different loads.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A multi-relay wireless power transmission system based on switched capacitors, characterized in that: It includes a DC power supply, an inverter module, a resonant network module, a transmitting coil module, a first relay coil module, a second relay coil module, a receiving coil module and a rectifier module; The DC power supply is connected to the input of the inverter module, 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, the output of the transmitting coil module is arranged relative to the input of the first relay coil module, the output of the first relay coil module is arranged relative to the input of the second relay coil module, the output of the second relay coil module is arranged relative to 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; The resonant network module includes a coil L p2 , controllable switch capacitor C P1 And fixed value capacitor C P2 , fixed value capacitor C P2 One end of the coil L is connected p2 The other end of the fixed capacitor C P2 The other end is connected to the transmitting coil module, and the controllable switch capacitor C P1 Including fixed value capacitor C a , fixed value capacitor C b , switch tube Q1 and switch tube Q2; The fixed value capacitor C b One end of the coil L is connected p2 The other end of the coil L p2 One end of the capacitor is connected to the source of the switch tube S1, and the fixed value capacitor C b The other end is connected to the drain of the switch tube Q1, and the drain of the switch tube Q1 is connected to the fixed value capacitor C a The source of the switch tube Q1 is connected to the drain of the switch tube Q2, and the source of the switch tube Q2 is connected to the fixed value capacitor C a At the other end, the gate of the switch tube Q1 and the gate of the switch tube Q2 are connected to the corresponding switch tube driving circuit.

2. The multi-relay wireless power transmission system based on switched capacitor according to claim 1, characterized in that: Fixed value capacitor C P2 , fixed value capacitor C a And fixed value capacitor C b There are no restrictions on models.

3. The multi-relay wireless power transmission system based on switched capacitor according to claim 1, characterized in that: The switch tube Q1 and the switch tube Q2 are both MOSFETs.

4. The multi-relay wireless power transmission system based on switched capacitor according to claim 1, characterized in that: The inverter module includes a switch tube S1, a switch tube S2, a switch tube S3 and a switch tube S4, the drain of the switch tube S1 is connected to the drain of the switch tube S3, the source of the switch tube S3 is connected to the drain of the switch tube S4, the source of the switch tube S4 is connected to the source of the switch tube S2, the drain of the switch tube S2 is connected to the source of the switch tube S1, and the gates of the switch tube S1, the gates of the switch tube S2, the gates of the switch tube S3 and the gates of the switch tube S4 are connected to corresponding switch tube drive circuits.

5. The multi-relay wireless power transmission system based on switched capacitor according to claim 4, characterized in that: The switch tube S1 , the switch tube S2 , the switch tube S3 and the switch tube S4 are all MOSFETs.

6. The multi-relay wireless power transmission system based on switched capacitor according to claim 1, characterized in that: The rectifier module includes a diode D1, a diode D2, a diode D3 and a 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.

7. The multi-relay wireless power transmission system based on switched capacitor according to claim 6, characterized in that: The cathode of diode D3 and the anode of diode D4 are also connected in parallel with filter capacitor C L .

8. The multi-relay wireless power transmission system based on switched capacitor according to claim 6, characterized in that: The diode D1, the diode D2, the diode D3 and the diode D4 are all rectifier diodes.

9. The multi-relay wireless power transmission system based on switched capacitor according to claim 7, characterized in that: Filter capacitor C L The model is not restricted.

10. A method for using the multi-relay wireless power transmission system based on switched capacitors according to any one of claims 1 to 9, comprising the following steps: Invert the DC power supply into AC through the inverter module; The obtained alternating current is passed through the fixed capacitor Ca, the fixed capacitor Cb, the switch tube Q1 and the switch tube Q2 in the resonant network module to eliminate reactive components of the multi-relay wireless power transmission system based on the switch capacitor, and the alternating current after the reactive components are eliminated is obtained; After the reactive component is eliminated, the AC current is rectified and filtered through a rectifier module and a filter module, and finally a DC current is output; The final output DC current is used to power different loads.

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