CN111711284A

CN111711284A - Remote power supply system

Info

Publication number: CN111711284A
Application number: CN202010564551.6A
Authority: CN
Inventors: 王哲; 陆钧; 贺凡波; 葛俊杰; 马俊超
Original assignee: Beijing Invispower Co Ltd
Current assignee: Beijing Invispower Co Ltd
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2020-09-25

Abstract

The invention discloses a remote power supply system, comprising; office end equipment, far-end equipment and guide cable, wherein, office end equipment includes: the first working circuit, the first coil and the second coil; the first working circuit is communicated with a first coil, the first coil is coupled with a second coil, and the number of turns of the second coil is greater than that of the first coil; the remote device includes: a load, a second operating circuit, a third coil and a fourth coil; the second working circuit is communicated between the load and the third coil, the third coil and the fourth coil are coupled, and the number of turns of the fourth coil is greater than that of the third coil; the guide cable is communicated between the second coil and the fourth coil. The remote power supply system reduces energy consumption on the basis of realizing remote power supply.

Description

Remote power supply system

Technical Field

The present invention relates to a remote power supply system.

Background

As an important infrastructure in the field of communications and the like, base station construction is in a high-speed development stage for a long time. The conventional power supply methods of the communication base station generally include a direct power supply method from a power supply station and a power transfer method from a peripheral enterprise. The rapid development of the communication technology is developed from 4G to 5G, the layout density of the base station is greatly increased, the power consumption of a system is also increased by multiple times, the problems of power searching, wiring difficulty and the like exist in the power supply of the base station, the circuit reconstruction is carried out, the investment is large, the problems exist in the early coordination and communication and the later maintenance management, and the requirement of rapid development of the base station construction cannot be met.

In addition, the power supply of the base station also has a self remote power supply mode of a communication enterprise, including a direct current remote power supply mode and an alternating current remote power supply mode, but a special cable for alternating current and direct current power transmission needs to be erected, and the power supply cable is laid outdoors in a long distance, so that the problems of line loss, personal safety, electrical safety, theft prevention and the like exist. Meanwhile, as the communication network is continuously constructed to extend to remote areas, the outdoor power supply quality is very poor, even in places without mains supply, the problem of power supply of a base station is more prominent, and the high-quality power supply is the key for reliable work of network communication equipment.

Disclosure of Invention

The invention provides a remote power supply system which can reduce the line loss while realizing remote power supply.

The remote power supply system of the invention comprises; office end equipment, far-end equipment and guide cable, wherein, office end equipment includes: the device comprises a power supply, a first working circuit, a first coil and a second coil; the first working circuit is communicated between the power supply and the first coil, the first coil is coupled with the second coil, and the number of turns of the second coil is greater than that of the first coil; the remote device includes: a load, a second operating circuit, a third coil and a fourth coil; the second working circuit is communicated between the load and the third coil, the third coil and the fourth coil are coupled, and the number of turns of the fourth coil is greater than that of the third coil; the guide cable is communicated between the second coil and the fourth coil.

Preferably, the radius of the second coil is smaller than or equal to the radius of the first coil; the radius of the fourth coil is smaller than or equal to that of the third coil.

Preferably, the second coil, the fourth coil and the guide cable form a resonant circuit, and a resonant frequency of the resonant circuit is f; and the distance between the second coil and the fourth coil is less than or equal to c/2 pi f, wherein c is the speed of light.

Preferably, the variable reactance component is also included; at least one of the second coil and the fourth coil is connected to the variable reactance component.

Preferably, the first operating circuit includes: the local side direct current converter, the local side inverter and the local side compensation circuit; the second operating circuit includes: the remote-end filter, the remote-end DC converter and the remote-end compensation circuit.

Preferably, the office device further includes an office controller; the remote device further comprises a remote controller; the local controller and the remote controller are communicated through a communication cable.

Preferably, the office device further includes an office controller, an office driver, and an office sensor; the local side driver is communicated with the local side controller and the local side inverter; the local side sensor is communicated with the local side controller and the local side compensation circuit; the local side controller is also in signal communication with the local side direct current converter and the second coil respectively; the remote device further comprises a remote controller and a remote sensor; the remote sensor is communicated with the load and the remote controller; the far-end controller is also respectively in signal communication with the far-end filter, the far-end direct-current converter and the fourth coil; the local controller and the remote controller are communicated through a communication cable.

Preferably, the variable reactance component is an adjustable capacitor or an adjustable inductor.

Preferably, the guide cable and the communication cable constitute a cable assembly; alternatively, the guide cable and the communication cable are the same cable.

The remote power supply system reduces energy consumption on the basis of realizing remote power supply.

Drawings

FIG. 1 is a schematic diagram of one embodiment of a remote power supply system of the present application;

FIG. 2 is a schematic diagram of another embodiment of a remote power system of the present application;

FIG. 3 is a schematic diagram of one embodiment of a resonant tank in a remote power supply system of the present application;

FIG. 4 is a schematic diagram of another embodiment of a resonant tank in a remote power supply system of the present application;

FIG. 5 is a schematic diagram of a variable impedance device in a remote power system of the present application;

fig. 6 is a schematic diagram of a base station network in the remote power supply system of the present application.

Reference numerals:

the remote controller includes a local device 1, a remote device 2, a lead cable 3, a power supply 11, a first operating circuit 12, a first coil 13, a second coil 14, a load 21, a second operating circuit 22, a third coil 23, a fourth coil 24, a remote controller 25, a remote sensor 26, a local dc converter 121, a local inverter 122, a local compensation circuit 123, a remote filter 221, a remote dc converter 222, and a remote compensation circuit 223.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

The invention discloses a remote power supply system, which comprises a local side device 1, a far-end device 2 and a guide cable 3, and is shown in figures 1 and 2. The local device 1 may be understood as a power supply side, and the remote device 2 may be understood as a power receiving side. The dot-dash lines are drawn for convenience in distinguishing the local side device 1 from the remote side device 2.

For example, when applied to a base station, one base station may have both the central office device 1 and the remote device 2, and the remote device 2 is used to receive power and supply the power to the base station, and at the same time, the central office device 1 on the same base station can also transmit the power to the next base station. In some embodiments, the remote device 2 may continue to transmit to the remote device 2 of the next stage, equivalent to a multi-coil cascade of wireless power transfer.

It is also possible to use a single central office device 1 for simultaneously supplying power to a plurality of remote devices 2, which is also called a star connection. The power supply has the advantages that as long as one place is provided with the power supply, other places can obtain electric energy, and the problem of 'difficult power finding' is solved.

It can be seen that, in the remote power supply system of the present application, the local-side device 1, the remote-side device 2, and the guide cable 3 only constitute a unit of a minimum power supply path, and in practical applications, the local-side device 1, the remote-side device 2, and the guide cable 3 may be multiple ones, so as to form a large-area remote power supply network, and implement large-scale power supply, rather than only aiming at power supply between two points.

Referring to fig. 1 to 2, the office device includes: a first operating circuit 12, a first coil 13 and a second coil 14. The first working circuit 12 is connected to the first coil 13, the first coil 13 is coupled to the second coil 14, and the number of turns of the second coil 14 is greater than that of the first coil 13, and in a preferred embodiment, the radius of the second coil 14 is smaller than or equal to that of the first coil 13.

When the power supply works, a power supply 11 is needed as an input of electric energy, the first working circuit 12 is provided with a power supply access port, and the power supply 11 is communicated with the first working circuit 12. The power source 11 is a source of electric power and may be supplied from a power grid or the like. In a network formed by a plurality of base stations, some base stations may also supply power to other base stations after receiving power, so that the powered base stations can be used as power supplies 11 of other base stations needing power supply. ,

the base station can be also provided with a battery, mainly a standby power supply for preventing the power supply system from generating problems, and the base station is generally configured with the standby battery in practical application. The remote device includes: a load 21, a second operating circuit 22, a third coil 23, and a fourth coil 24; the second operating circuit 22 is connected between the load 21 and the third coil 23, the third coil 23 is coupled to the fourth coil 24, the number of turns of the fourth coil 24 is greater than that of the third coil 23, and the radius of the fourth coil 24 is smaller than or equal to that of the third coil 23 in the preferred embodiment.

The guide cable 3 is communicated between the second coil 14 and the fourth coil 24.

The second coil 14 in the local-side device 1, the fourth coil 24 in the remote-side device 2, and the lead wire 3 constitute a resonant circuit, and the distance between the second coil 14 and the fourth coil 24 is c/2 pi f or less at the resonant frequency f of the resonant circuit. For example when the resonance frequency is 50 kHz. The maximum distance between the local and remote devices is around 954 meters (as calculations involving pi and speed of light, rounding is used here as an example only).

In some embodiments, further comprising a variable impedance component 4, at least one of the second coil 14 and the fourth coil 24 is connected to the variable reactance component 4. Typically, the second coil 14 and the fourth coil 24 are each connected to a variable reactance module 4. The variable reactance component 4 is an adjustable capacitor 41 or an adjustable inductor 42.

The first operating circuit 12 and the second operating circuit 22 are explained below.

The first operating circuit 12 includes: a local side dc converter 121, a local side inverter 122, and a local side compensation circuit 123; the second operating circuit 22 includes: a far-end filter 221, a far-end dc converter 222, and a far-end compensation circuit 223.

The office device 1 further includes an office controller 15; the remote device 2 further comprises a remote controller 25; the local controller 15 and the remote controller 25 are communicated through the communication cable 5.

The office device 1 further includes an office controller 15, an office driver 17, and an office sensor 16; the local side driver 17 is connected with the local side controller 15 and the local side inverter 122; the local side sensor 16 is connected with the local side controller 15 and the local side compensation circuit 123; the local side controller 15 is further in signal communication with the local side dc converter 121 and the second coil 14, respectively; the remote device 2 further comprises a remote controller 25 and a remote sensor 26; a remote sensor 26 in communication with the load 21 and the remote controller 25; the far-end controller 25 is also in signal communication with the far-end filter 221, the far-end direct-current converter 222 and the fourth coil 24 respectively; the local controller 15 and the remote controller 25 are communicated through the communication cable 5.

In some embodiments, the local controller 15 and the remote controller 25 may communicate wirelessly, in which case the communication cable 5 may not be used.

The operation of the remote charging system in the present application will be described in detail below by taking a base station as an example.

Assuming that there are N base stations in a region, according to different planning schemes, each of the N base stations may simultaneously set the local device 1 and the remote device 2. When power is supplied, for example, by using a municipal power grid, the power grid is connected to the central office end equipment 1 of one or more base stations, and the central office end equipment 1 supplies power to the remote end equipment 2 of other base stations. The remote device 2 is powered and then used by a load, or the battery of the base station is charged. Moreover, because the base station is provided with the local side device 1 and the remote side device 2 at the same time, after the remote side device 2 is powered on, the local side device 1 installed on the same base station can supply power to the subsequent base station. In this case the first base station gets power from the grid, which operates as a power supply 11. At the same time, the power supplied by the first base station to the second base station is used as the power supply 11 of the second base station. That is, the power source 11 is a general term capable of supplying electric power, and may be a power grid or a device for transmitting electric power. Referring to fig. 6, a base station network is formed. The power supply 11 marked in the figure is provided by the power grid, and in subsequent base stations, the power supply 11 may be provided by a remote power supply system. Or, it can be simply understood that, the remote device 2 on one base station is powered on, and the obtained electric energy drives the base station to work on one hand, and is transmitted to the local device 1 of the base station to be used as the power source 11, so that the electric energy is continuously transmitted backwards.

Of course, in some embodiments, one or several of the N base stations may obtain power from the power grid, and the remote device 2 may not be provided, and one or several base stations may obtain power only through other base stations or the power grid, and need not supply power to other base stations, and then the local device 1 may not be provided.

In the power supply process, the power is transmitted to the remote device 2 under the guidance of the guide cable 3, where the central office device 1 is a transmitting end of the power, and the central office device includes a central office direct current converter 121, a central office inverter 122, a central office compensation circuit 123, a central office controller 15, a central office driver 17, a central office sensor 16, a first coil 13, and a second coil 14. The far-end device 2 is a receiving end of electric power, and includes a local-end dc converter 121, a far-end filter 221, a far-end compensation network 223, a far-end controller 5, a far-end sensor 26, a third coil 23, a fourth coil 24, and a load 21.

The central office device 1 converts the power frequency ac power input from the power supply 11 into dc power through the central office dc converter 121, and the central office dc converter 121 performs filtering, rectification, factor adjustment, and the like, and finally outputs dc power. The dc power is converted into high frequency ac power by the local side inverter 122, and the high frequency ac power is inputted to the local side compensation circuit 123 and the first coil to generate an alternating magnetic field, and the second coil is tightly coupled to the first coil. The spatial relationship between the first coil and the second coil may be that the second coil is inserted into the first coil, or the first coil 13 and the second coil 14 are formed by winding the first coil and the second coil in parallel, and the radius of the first coil 13 and the radius of the second coil 14 may be the same when the first coil and the second coil are wound.

Between the second coil and the first coil, it is equivalent to the structure of a step-up transformer. The first coil 13 is a low voltage coupled coil and the second coil 14 is a high voltage coupled coil. The magnetic field flux of the first coil 13 is directed through the second coil 14, generating an induced voltage in the second coil 14 and causing a flowing current in the second coil 14. The loop (number of turns) of the second winding 14 is greater than the loop (number of turns) of the first winding 13, i.e. both have a high voltage transformation ratio, and the transformer effect is followed between the two windings, thus generating a voltage increase in the second winding 14.

In the remote apparatus, the principle between the third coil 23 and the fourth coil 24 is similar to that described above, and the third coil 23 corresponds to a low-voltage coupling coil and the fourth coil 24 corresponds to a high-voltage coupling coil.

The high-voltage coupling coils (the second coil 14 and the fourth coil 24) of the local device 1 and the remote device 2 are connected through the guide cable 3, the second coil 14 forms a loop B, the fourth coil 24 forms a loop C, and the loop is an RLC parallel resonant loop, as shown in fig. 3 and 4, where RA, LA, and CA are equivalent resistance, equivalent inductance, and equivalent capacitance of the second coil 14 in the local device 1; RB, LB, CB are the equivalent resistance, the equivalent inductance and the equivalent capacitance, respectively, of the fourth coil 24 of the remote device 2. Its equivalent capacitance CA or CB includes the inter-turn capacitance of the spiral coil and the capacitance between the coil and the lead cable 3.

The lower ends of the high-voltage coupling coils of the local side equipment 1 and the far-end equipment 2 are connected by a guide cable in the guide cable 3, so that equipotential is kept between the two resonant circuits.

In the present application, the distance between the local device 1 and the remote device 2 is less than or equal to c/2 pi f, and at this time, the second antenna 14 and the fourth antenna 24 can be regarded as antennas (i.e. as one plate of a separate capacitor), the distance between the second antenna 14 and the fourth antenna 24 is within the above formula range, the antennas are still in the near field of wireless energy transfer, the antennas do not radiate electromagnetic wave energy to the outside of the near field, and the electromagnetic wave energy periodically flows back and forth between the antennas and the near field space around the antennas. Therefore, an equivalent capacitance CAB can be seen between the second antenna 14 and the fourth antenna 24 of the local device 1 and the remote device 2, a displacement current exists between the capacitances formed by the two loops, and the current path is provided by the guide cable 3. In operation, for the sinusoidal alternating current loaded on the capacitor, the phase difference between the voltage and the current is 90 degrees, and the phase of the current leads the voltage by 90 degrees. And the power is equal to the voltage multiplied by the current, the product of the current and the voltage in one period is always zero, and the process of transmitting the displacement current in the capacitor does not consume power, so that the energy transmitted by the method theoretically has very high transmission efficiency, and simultaneously, ohmic loss does not exist on materials through which the displacement current flows in a transmission path.

Referring to fig. 2, for convenience of explanation, the remote power supply system is divided into four loop parts, ABCD, loop a, which may also be referred to as a power supply loop, a first operating circuit 12, a first coil 13, and in other preferred embodiments, an office controller 15, an office driver 17, and an office sensor 16. Loop B is the loop formed by the second coil 14, loop C is the loop formed by the fourth coil 24, and loop D may be referred to as a load loop, and includes the load 21, the second operating circuit 22, and the third coil 23, and further includes the remote controller 25 and the remote sensor 26 in other embodiments.

In one embodiment of the present patent, if the remote device 2 is in a complex change or network, such as a change in the load 21 or a complex network formed by a plurality of remote devices, the operating frequency of the system may deviate from the resonant frequency of the resonant tank or even exceed the critical point of the resonant state, so that the resonant tank is no longer in the resonant state, which may cause the transmission efficiency to change or even fail to transmit energy.

To solve this problem, a compensation circuit (the local side compensation circuit 123; the far side compensation circuit 223) may be provided in the power supply loop (loop a) and the load loop (loop D) or the local side driver 17 of the adjusting power supply loop may adjust or compensate for such frequency offset. The self-capacitance or self-inductance of the resonant tank, i.e. LA, LB or CA, CB, can also be adjusted.

In addition to solving the above problems, there is a more efficient embodiment to add a variable reactive component 4, such as a variable inductance or capacitance, in the resonant tank. Independent and separate variable reactive components 4 are provided to be added to the resonant tank in series or in parallel, and may also be combined in the manner described above to form a composite tuned tank. Stepped variable reactance may be provided in such embodiments by switching between taps of an inductor or between multiple series/parallel capacitors, and fig. 3 and 4 are schematic diagrams of the manner of connecting independently separated adjustable capacitances in parallel and the manner of adjustable inductance.

Referring to fig. 5, a variable inductor is shown as the variable reactive component 4, the variable inductor includes a plurality of taps, which are shown as T1, T2, T3 and T4, two terminals of the variable inductor are connected in parallel to the second winding 14 (or in parallel to the fourth winding 24), and a switch 41 is connected to one of the terminals for selectively connecting with one of the taps. Connecting different taps will cause the variable inductance to provide different reactance values. Fig. 5 is merely an illustration, the number of taps may be increased to provide finer impedance adjustment, and the switch 41 is shown for illustrative purposes and is not a limiting configuration.

The current of the second coil 14 of the office equipment 1 is transmitted to the fourth coil 24 of the remote equipment 2 under the guidance of the guide cable 3, the process is similar to that of the office equipment 1, the fourth coil 24 and the third coil 23 form a structure equivalent to a step-down transformer, the high-voltage alternating magnetic field couples the third coil 23 to generate a low-voltage alternating magnetic field, and further generate low-voltage induced alternating current, and the alternating current is transmitted to the remote direct current converter 222 and the remote filter 221, then converted into direct current, and then transmitted to the load 21. The load 21 may be a generic term for a variety of consumers.

Although the base station is taken as an example for description, after the far-end device 2 is powered on, power may be supplied to other devices, such as a radio frequency module, an optical fiber repeater, a small macro base station, a micro cellular base station, a dry amplifier, a WLAN, a PTN device, and an outdoor integrated access cabinet.

The system is provided with controllers, namely a local controller 15 and a remote controller 25, at the local device 1 and the remote device 2 respectively. And a local side sensor 16 for controlling the data to be collected, wherein the local side sensor 16 adjusts the power output of the power supply according to the load change and the power demand of the remote device 2, and simultaneously tunes the resonant circuits of the local side device 1 and the remote device 2 to enable the local side device to be in a resonant state.

The guide cable 3 and the communication cable 5 may constitute a cable assembly that enables connection between the local-side device 1 and the remote-side device 2. Data transmission between the base stations is carried by communication cables, and data exchange between the local controller 15 and the remote controller 25 may also be carried by communication cables. A typical telecommunication cable may employ an optical cable. In some embodiments, the guiding cable 3 and the communication cable 5 may be one cable, which both performs the communication function and acts as a guiding carrier for the displacement current.

The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.

Claims

1. A remote power supply system, comprising:

a local side device (1), a remote side device (2) and a guide cable (3), wherein,

the office device includes: a first operating circuit (12), a first coil (13), and a second coil (14);

the first working circuit (12) is communicated with the first coil (13), the first coil (13) is coupled with the second coil (14), and the number of turns of the second coil (14) is greater than that of the first coil (13);

the remote device includes: a load (21), a second operating circuit (22), a third coil (23), and a fourth coil (25);

the second operating circuit (22) is connected between the load (21) and the third coil (23), the third coil (23) and the fourth coil (24) are coupled, and the number of turns of the fourth coil (24) is greater than that of the third coil (23);

the guide cable (3) is communicated between the second coil (14) and the fourth coil (24).

2. Remote power supply system according to claim 1,

the radius of the second coil (14) is less than or equal to the radius of the first coil (13);

the radius of the fourth coil (24) is equal to or less than the radius of the third coil (23).

3. Remote power supply system according to claim 1,

-the second coil (14), the fourth coil (24) and the guide wire (3) form a resonant tank having a resonant frequency f;

the distance between the second coil (14) and the fourth coil (24) is less than or equal to c/2 pi f, wherein c is the speed of light.

4. Remote power supply system according to claim 1,

further comprising a variable reactance component (4);

at least one of the second coil (14) and the fourth coil (24) is connected to the variable reactance component (4).

5. Remote power supply system according to claim 1,

the first operating circuit (12) comprises:

a local side direct current converter (121), a local side inverter (122) and a local side compensation circuit (123);

the second operating circuit (22) includes:

a far-end filter (221), a far-end DC converter (222) and a far-end compensation circuit (223).

6. Remote power supply system according to claim 1,

the local side equipment (1) further comprises a local side controller (15);

the remote device (2) further comprises a remote controller (25);

the local controller (15) and the remote controller (25) are communicated through a communication cable (5).

7. A remote power supply system as in claim 5,

the local side equipment (1) further comprises a local side controller (15), a local side driver (17) and a local side sensor (16);

the local side driver (17) is communicated with the local side controller (15) and the local side inverter (122);

the local side sensor (16) is communicated with the local side controller (15) and the local side compensation circuit (123);

the local side controller (15) is also in signal communication with the local side direct current converter (121) and the second coil (14) respectively;

the remote device (2) further comprises a remote controller (25) and a remote sensor (26);

said remote sensor (26) communicating between said load (21) and said remote controller (25);

the far-end controller (25) is also respectively in signal communication with the far-end filter (221), the far-end direct current converter (222) and the fourth coil (24);

8. Remote power supply system according to claim 4,

the variable reactance component (4) is an adjustable capacitor (41) or an adjustable inductor (42).

9. Remote power supply system according to claim 6 or 7,

the guide cable (3) and the communication cable (5) form a cable assembly; alternatively, the first and second electrodes may be,

the guide cable (3) and the communication cable (5) are the same cable.