CN108448733A - A wireless power supply system and transportation system for vehicles - Google Patents

Abstract

The embodiment of the present invention discloses a wireless power supply system for vehicles and a transportation system. The wireless power supply system includes: a power supply module, a feeding shielded line and a traction unshielded line; The shielded line provides the power supply, so that the powered equipment uses the principle of electromagnetic induction to induce the power supply to obtain electric energy; the traction unshielded line includes at least two blocks, each block is isolated from each other and the length of each block is less than The resonant wavelength of the power supply voltage and current reduces the power loss on the traction unshielded line, reduces the power cost, and improves the efficiency of wireless power supply.

Description

A wireless power supply system and transportation system for vehicles

technical field

The present application relates to the technical field of transportation, in particular to a wireless power supply system for vehicles and a transportation system.

Background technique

In the field of transportation, the existing wireless power supply technology uses battery induction. The basic principle is to generate resonance in the wire by increasing the frequency and voltage of the output power of the power supply side, and the power receiver senses the single conductor line. The magnetic induction effect obtains the electrical energy output to the powered equipment. However, the inventor found in the research that due to the large inductive resistance of the wire under high-frequency conditions, the power consumption on the wire is relatively large, which will cause the cost loss of power supply, and the cost of wireless power supply is high and the efficiency is low.

Contents of the invention

In order to solve the problems in the prior art, the embodiment of the present application provides a wireless power supply system for vehicles and a transportation system, which can reduce power loss on wires, reduce power costs, and improve power supply efficiency.

A wireless power supply system for vehicles provided by an embodiment of the present application includes: a power supply module, a shielded feeder circuit and an unshielded traction circuit;

The power supply module provides a power supply for the traction unshielded line through the feeding shielded line, so that the powered equipment can sense the power supply by using the principle of electromagnetic induction to obtain electric energy;

The pulling unshielded line includes at least two block sections, each of which is isolated from each other and whose length is smaller than the resonance wavelength of the power supply voltage and current.

Optionally, the system further includes at least two auxiliary facility units;

There is a one-to-one correspondence between the auxiliary facility units and the blocks;

The power supply module also supplies power to each of the auxiliary facility units via the shielded feeder line.

Optionally, the auxiliary facility unit includes: a control module and auxiliary facilities;

The control module is configured to control the power supply module to supply power to the auxiliary facilities when the powered equipment is located on the corresponding block.

Optionally, the auxiliary facilities include any one or more of street lamps, traffic lights, cameras, signboards and gates.

Optionally, the system also includes at least two control modules;

The control module is in one-to-one correspondence with the blocks,

The control module is configured to control the power supply module to supply power to the block through the feeding shielded line when the powered device is located on the corresponding block.

Optionally, the control module includes: a sensor, a controller and a switch;

The sensor is used to sense whether there is the powered device on the block corresponding to the control module;

The controller is configured to control the switch to be turned on or off according to the sensing result of the sensor;

The switch is connected in series on the feeding shielding line.

Optionally, the power supply module includes: a power supply, a frequency converter and a transformer;

The power is output to the primary coil of the transformer through the frequency converter, and the secondary coil of the transformer is connected to the feeding shielding line.

optional,

The feeding shielding lines are all provided with a shielding layer;

The shielding layer includes at least two mutually independent insulation sections, and the length of each insulation section is smaller than the resonance wavelength of the power supply voltage and current.

optional,

The length of the block is k times the resonance wavelength, k is greater than or equal to 0.001 and k is less than or equal to 0.1.

A transportation system provided in an embodiment of the present application includes the wireless power supply system for vehicles as described in any of the above embodiments; the system also includes at least one transportation tool;

Each vehicle runs on the road where the traction unshielded line is laid, and is used to induce harmonics on the blocks to obtain electric energy by using the principle of electromagnetic induction.

Compared with the prior art, the present application has at least the following advantages:

In the embodiment of this application, the power supply module provides the power supply with harmonic wavelength λ for the traction unshielded line through the feeder shielded line, and the power receiver can use the principle of electromagnetic induction to induce the harmonics on the traction unshielded line to obtain electric energy. Since the embodiment of the present application divides the traction unshielded line into at least two mutually independent and mutually insulated blocks, the length of each block is smaller than the resonant wavelength of the power supply voltage and current, which reduces the noise on the traction unshielded line. The loss of electric energy reduces the cost of electric energy and improves the efficiency of wireless power supply.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments described in this application. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic diagram of an existing wireless power supply transportation system;

FIG. 2 is a schematic structural diagram of a wireless power supply system for vehicles provided by an embodiment of the present application;

FIG. 3 is a schematic structural diagram of another wireless power supply system for vehicles provided by the embodiment of the present application;

Fig. 4 is a schematic structural diagram of another wireless power supply system for vehicles provided by an embodiment of the present application.

Detailed ways

In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

For ease of understanding, a specific application scenario of the embodiment of the present application is firstly introduced.

Referring to FIG. 1 , it is a schematic diagram of a wireless power supply transportation system.

The power supply 1 is connected to the feeding shielded single conductor line 2 via the frequency converter 3 and the step-up transformer 4 one by one. The shielding layer 5 covers the feeding shielding single conductor line 2 . The traction unshielded single-conductor line 6 is isolated from the step-up transformer 4 and laid on the driving road, and the traction unshielded single-conductor line 6 is connected to the feeding shielded single-conductor line 2 . A switch 9 is arranged on the feeding shielding single conductor line 2 , and the controller 10 controls the switch 9 to be turned on and off according to the detection result of the sensor 11 . The sensor 11 is used to detect whether there is a powered vehicle 7 running on the driving road on which the towing unshielded single conductor line 6 is laid. The vehicle 7 is provided with a receiver 13 in the direction close to the driving road surface, and the receiver 13 is connected to the traction motor 17 on the vehicle 7 through a step-down transformer 14 , a rectifier 15 and an inverter 16 one by one.

In operation, electrical energy flows from the power source 1 to the frequency converter 3, increasing the frequency to 1-500kHz. Then, the resonant oscillation of current and voltage is generated by the step-up transformer 4 and output to the feeding shielded single conductor line 2 . When the vehicle 7 travels on the road surface where the traction unshielded single conductor line 6 is laid, the sensor 11 detects that the vehicle 7 notifies the controller 10, the controller 10 controls the switch 9 to be turned on, and the resonant oscillation of the current and voltage is transmitted to the traction Unshielded single conductor line6. The vehicle 7 approaches the traction unshielded single conductor line 6, and the electric energy passes through the air capacitor formed by the traction unshielded single conductor line 6 and the receiver 13, the step-down transformer 14, the rectifier 15 and the inverter 16 to input the traction motor 17, for The vehicle 7 is powered.

The inventor found in research that there is no radiation loss of electric energy in the feeding shielded single conductor line 2 , but there is radiation loss in the traction unshielded single conductor line 6 . According to the radiation loss formula shown in equation (1) below,

In the formula, P is the radiation loss, I _Φ is the effective current density in the line, l is the line length, and λ is the harmonic wavelength;

When the length of the traction unshielded single conductor line 6 equals the harmonic wavelength, i.e. l=λ, the radiation loss _P of electric energy on the traction unshielded single conductor line 6 is as follows (2),

For this reason, the embodiment of the present application provides a wireless power supply system and transportation system for vehicles, which divides the traction unshielded single-conductor line into multiple blocks, reduces the length of each line, and not only reduces the length of the line The equivalent resistance of the vehicle can reduce the power loss on the line; according to the driving position of the vehicle, only the block corresponding to the position can be powered, which further reduces the loss of power on the traction unshielded single-conductor line, saving power and Electricity cost.

Based on the above ideas, in order to make the above purpose, features and advantages of the present application more obvious and understandable, the specific implementation manners of the present application will be described in detail below in conjunction with the accompanying drawings.

Embodiment one:

Referring to FIG. 2 , this figure is a schematic structural diagram of a wireless power supply system for vehicles provided by an embodiment of the present application.

The wireless power supply system for vehicles provided in the embodiment of the present application includes: a power supply module 100, a feeding shielded line 200 and a traction unshielded line 300;

The power supply module 100 provides power supply to the traction unshielded line 300 through the feeding shielded line 200, so that the power receiving equipment uses the principle of electromagnetic induction to induce the power supply to obtain electric energy.

In the embodiment of this application, the power receiving equipment can be any means of transportation, such as electric vehicles, trams, trolleybuses, electric trains, electric bicycles, electric motorcycles, subways, underground trams, and other electric transportation tools. The embodiment does not specifically limit this.

In some possible implementation manners, the power supply module 100 may specifically include: a power supply 101, a frequency converter 102 and a transformer 103;

The power supply 101 is output to the primary coil of the transformer 103 via the frequency converter 102 , and the secondary coil of the transformer 103 is connected to the feeding shielding line 200 .

It can be understood that the power supply 101 , the frequency converter 102 and the transformer 103 can be the power supply 1 , the frequency converter 3 and the step-up transformer 4 described above, respectively. For the specific working principle, please refer to the above description, which will not be repeated here.

In some possible designs, the shielded feeder lines 200 are provided with a shielding layer; the shielding layer includes at least two mutually independent insulating segments 201 , and the length of each insulating segment 201 is smaller than the resonance wavelength of the power supply voltage and current.

The traction unshielded line 300 includes at least two block sections 301, each block section 301 is isolated from each other and the length is smaller than the resonance wavelength of the power supply voltage and current.

Assuming that the length of the block 301 is kλ, k∈(0,1), according to the above formula (1), it can be known that the radiation loss _P on the block 301 is as follows (3),

The radiation loss on the pulling unshielded line 300 of the same length is k times smaller than the radiation loss P ₁ , reducing the radiation loss on the pulling unshielded line 300 .

As an example, the value range of k may be 0.001≦k≦0.1, correspondingly, the radiation loss on the pulling unshielded line 300 may be reduced by 10-100 times.

In some possible implementations of the embodiments of the present application, referring to FIG. 3 , the wireless power supply system for vehicles provided in the embodiments of the present application may further include at least two control modules 400;

The control module 400 corresponds to the block section 301 one by one; the control module 400 is used to control the power supply module 100 to supply power to the block section 301 through the feeding shielded line 200 when the powered device is located on the corresponding block section 301, that is, each The control module 400 controls whether there are current and voltage harmonics on a block segment 301 .

In the embodiment of the present application, the control module 400 can independently control the power supply module 100 to provide each block segment 301 with harmonics of current and voltage. According to formula (3), it can be seen that the radiation loss on the traction unshielded line 300 can be reduced by k ² times, further reducing the power loss on the traction unshielded line 300 .

In some possible designs, continue referring to FIG. 3, the control module 400 includes: a sensor 401, a controller 402 and a switch 403;

The sensor 401 is used to sense whether there is a powered device on the block 301 corresponding to the control module.

The controller 402 is configured to control the switch 403 to be turned on or off according to the sensing result of the sensor 401 .

The switch 403 is connected in series with the shielded feeder line 200 to control the power supply module 100 to provide power supply to the block section 301 corresponding to the control module 400 .

When the sensor 401 detects that there is a powered device on the corresponding block segment 301 , it notifies the controller 402 . After receiving the notification from the sensor 401 , the controller 402 controls the switch 403 to be turned on, so that the power supply module 100 provides power supply to the block 301 corresponding to the control module 400 .

In the embodiment of this application, the power supply module provides the power supply with harmonic wavelength λ for the traction unshielded line through the feeder shielded line, and the power receiver can use the principle of electromagnetic induction to induce the harmonics on the traction unshielded line to obtain electric energy. Since the embodiment of the present application divides the traction unshielded line into at least two mutually independent and mutually insulated blocks, the length of each block is smaller than the resonance wavelength λ of the power supply voltage and current, reducing the The loss of electric energy reduces the cost of electric energy and improves the efficiency of wireless power supply.

Embodiment two:

Referring to FIG. 4 , this figure is a schematic structural diagram of another wireless power supply system for vehicles provided by an embodiment of the present application.

On the basis of Embodiment 1, the wireless power supply system for vehicles provided in the embodiment of the present application may further include at least two auxiliary facility units 500;

There is a one-to-one correspondence between the auxiliary facility units 500 and the block segments 301 ; the power supply module 100 also supplies power to each auxiliary facility unit 500 via the feeding shielded line 200 .

In some possible implementation manners, the auxiliary facility unit 500 may specifically include: a control module 501 and an auxiliary facility 502;

The control module 501 is configured to control the power supply module 100 to supply power to the auxiliary facility 502 to assist the operation of the powered equipment when the powered equipment is located on the corresponding block segment 301 .

In the embodiment of the present application, the auxiliary facility 502 can be any auxiliary electrical equipment in transportation, such as any one or more of street lamps, traffic lights, cameras, signs and gates, etc., which is not discussed in the embodiment of the present application Make specific limitations, and specific settings can be made according to actual needs during specific implementation, and will not be listed here.

In some possible designs, similar to the control module 400, the control module 501 may also include: a sensor, a controller and a switch;

The sensor is used to sense whether there is a powered device on the block 301 corresponding to the control module.

The controller is used to control the switch to be turned on or off according to the sensing result of the sensor.

The switch is connected in series on the shielded feeder line 200 to control the power supply module 100 to provide power supply to the block section 301 corresponding to the control module 400 .

When the sensor 401 detects that there is a powered device on the corresponding block segment 301 , it notifies the controller 402 . After receiving the notification from the sensor 401, the controller 402 controls the switch 403 to turn on, so that the power supply module 100 provides power supply to the auxiliary facility 502 corresponding to the control module 400, and assists the operation of the powered equipment on the corresponding block 301.

Taking the auxiliary facility as the street lamp end as an example, in practical application, the length of the street lamp segment can be set equal to the length of the corresponding block segment 301, so as to illuminate the vehicles driving on the block segment and improve the safety of the vehicles.

Optionally, the street lamp segment includes: street lamps, street lamp transformers and street lamp controllers;

The street lamp is connected to the feeder shielding line 200 via the street lamp transformer; the street lamp controller is used to control the feeder shielding line 200 to supply power to the street lamp.

As an example, the street lamp controller may include a light sensor to cut off the power supply of the street lamp during the day to save electric energy, and turn on the street lamp according to the driving position of the vehicle at night.

In the embodiment of the present application, the power supply module can not only supply power to the vehicle, but also supply power to auxiliary facilities of the vehicle according to the driving position of the vehicle, which can save electric energy on the basis of improving the driving safety of the vehicle.

In practical applications, the electric power of the power supply 101 may be 250kW, the voltage may be 220V or 380V, and the frequency may be 50Hz. The output frequency of the frequency converter 102 may be 25kHz, and the resonant frequency of the transformer 103 is also 25kHz. When the frequency of the transformer 103 is 25kHz, the voltage can be 100kV. The feeder shielding line 200 can be a single-conductor cable with a voltage of 100kV. The copper conductive core of the single-conductor cable has a cross-section of 5 mm2 and a length of 12 kilometers, and is laid along the road. The shielding layer 201 of the feeder shielding line 200 is composed of mutually independent insulation sections with a length of 100 meters. On the road, the traction unshielded line 300 and the feeder shielded line 200 are laid in parallel, the block section 301 is 1200 meters long, and the traction unshielded line 300 can be a single-conductor cable with a copper conduit cross-sectional area of 10 square millimeters. Install lighting street lamps along the roadbed, and the length of the street lamp section is the same as the length of the traction line block section, which is 1200 meters. The powered equipment can be a trolley bus, the electric power of its traction motor is 200kW, and the bottom of the trolley bus is equipped with an electrically insulating receiver. The receiver is made of two sheets of fiberglass with a 0.1 mm thick copper foil pressed between them. The dimensions of the receiver are 2 x 4 meters. The receiver is connected with a step-down transformer through a shielded cable, and the output voltage of the step-down transformer is 500V. The output end of the step-down transformer is connected to the traction motor through a rectifier and an inverter, and the inverter is used to regulate the traction motor. There is no radiation loss in the feeding shielded line 200, but the resonant frequency of the traction unshielded line 300 is 25kHz, the length is 12 kilometers, the block length is 1200 meters, the effective current density is 2A, the electric power is 200kW, the line voltage is 100kW, and the radiation The loss is only 10.048W, which saves electricity and power supply costs.

Based on the wireless power supply system for vehicles provided in the foregoing embodiments, an embodiment of the present application further provides a transportation system. The transportation system includes the wireless power supply system for vehicles provided in any of the above embodiments; the transportation system also includes at least one transportation tool;

Each transportation vehicle runs on the road surface laid with the traction unshielded line 200 , which is used to obtain electric energy by using the principle of electromagnetic induction to induce harmonics on the block section 301 .

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application in any form. Although the present application has disclosed the above with preferred embodiments, it is not intended to limit the present application. Any person familiar with the art, without departing from the scope of the technical solution of the application, can use the methods and technical content disclosed above to make many possible changes and modifications to the technical solution of the application, or to modify the equivalent of equivalent changes Example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present application that do not deviate from the content of the technical solution of the present application still fall within the protection scope of the technical solution of the present application.

Claims (10)

1. a kind of wireless power supply system for the vehicles, which is characterized in that the system includes：Power supply module, feed shielding Circuit and the unshielded circuit of traction；

The power supply module provides power supply through the feed shielded line for the unshielded circuit of traction, so as to be set by electricity It is standby to incude the power supply using electromagnetic induction principle, to obtain electric energy；

The unshielded circuit of the traction includes at least two blocks, and each block mutually be isolated and each block Length is respectively less than the resonance wavelength of the power supply voltage and current.

2. system according to claim 1, which is characterized in that the system further includes at least two auxiliary equipment units；

The auxiliary equipment unit and the block correspond；

The power supply module is also that each auxiliary equipment unit is powered through the feed shielded line.

3. system according to claim 2, which is characterized in that the auxiliary equipment unit, including：Control module and auxiliary Facility；

The control module, for when the power receiving equipment is located in corresponding block, it to be described to control the power supply module Auxiliary equipment is powered.

4. system according to claim 3, which is characterized in that the auxiliary equipment includes street lamp, traffic lights, camera shooting It is any one or more in machine, Sign Board and gate.

5. system according to claim 1, which is characterized in that the system also includes at least two control modules；

The control module and the block correspond,

The control module, for when the power receiving equipment is located in corresponding block, controlling described in the power supply module warp Shielded line is fed to power for the block.

6. the system according to claim 2 or 5, which is characterized in that the control module, including：Sensor, controller and Switch；

Whether the sensor has the power receiving equipment for incuding in the corresponding block of the control module；

The controller controls the switch conduction or shutdown for the sensing result according to the sensor；

The switch is connected on the feed shielded line.

7. according to the system described in claim 1-5 any one, which is characterized in that the power supply module, including：Power supply, change Frequency device and transformer；

The power supply is exported through the frequency converter to the primary coil of the transformer, and the secondary coil of the transformer connects institute State feed shielded line.

8. according to the system described in claim 1-5 any one, which is characterized in that

The feed shielded line is both provided with shielded layer；

The shielded layer includes at least two mutually independent insulating segments, and the length of each insulating segment is respectively less than the power supply The resonance wavelength of supply voltage and electric current.

9. according to the system described in claim 1-5 any one, which is characterized in that

The length of the block is k times of the harmonic wave；

Wherein, k is greater than or equal to 0.001, and k is less than or equal to 0.1.

10. a kind of transportation system, which is characterized in that the system includes as described in any one of claims 1-9 is used for The wireless power supply system of the vehicles；The system further includes an at least transport facility；

Each described transport facility travels on the road surface for being equipped with the unshielded circuit of traction, for utilizing electromagnetism sense It answers principle to incude the harmonic wave in the block and obtains electric energy.