CN110970985A - Vehicle and wireless charging system thereof - Google Patents
Vehicle and wireless charging system thereof Download PDFInfo
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- CN110970985A CN110970985A CN201811162886.4A CN201811162886A CN110970985A CN 110970985 A CN110970985 A CN 110970985A CN 201811162886 A CN201811162886 A CN 201811162886A CN 110970985 A CN110970985 A CN 110970985A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention relates to the technical field of wireless charging, in particular to a vehicle and a wireless charging system thereof, the system comprises a receiving end, a rectifying module, a voltage detection module and an electric device, wherein the receiving end is used for generating electric energy by matching with a transmitting end of the electric energy, the voltage detection module is used for detecting the voltage of the alternating current side or the direct current side of the rectifying module, the output end of the receiving end is connected with the alternating current side of the rectifying module, the direct current side of the rectifying module is used for being connected with a power battery for supplying power, the electric energy input end of the electric device is connected with the alternating current side or the direct current side of the rectifying module, when the voltage of the alternating current side or the direct current side of the rectifying module is greater than the corresponding safety voltage upper limit threshold value, the electric device is controlled to operate so as to reduce the voltage of the alternating current side or the direct current side of the rectifying module, the voltage, the situation that the system cannot be charged due to the fact that the rectification module is turned off when the voltage is too high is avoided.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a vehicle and a wireless charging system thereof.
Background
With the continuous development of wireless power transmission technology, the wireless charging of electric vehicles becomes the development direction of the future charging technology. In the development of high-power wireless charging technology, technology based on the magnetic resonance coupling principle becomes the main direction of wireless charging of electric vehicles. The wireless charging can realize energy transmission at a certain distance, but the characteristics of the product change along with the distance of the magnetic coupling mechanism, which causes severe problems. The transmitting coil and the receiving coil in the wireless charging system can be equivalent to a weakly coupled transformer, and wireless power transmission can be realized only by compensating the transformer. However, different compensation network structures and system characteristics of wireless energy transmission are different, and corresponding power control methods and system design methods are also different. At present, four basic network compensation structures adopting bilateral compensation are widely used, namely series compensation, series-parallel compensation, parallel-series compensation and parallel-parallel compensation.
The influence of load, frequency and coupling coefficient changes on voltage gain is intensively researched by deducing the transfer function of the system. When the vehicle is charged in the running process, the distance between the transmitting coil and the receiving coil is continuously changed along with the shaking of the vehicle chassis, so that the magnetic coupling coefficient is continuously changed, and if the processing system is not properly processed, the continuous change of the magnetic coupling coefficient can cause the instability of the system and even the failure of the system.
For dynamic wireless charging of an electric automobile, the air gap between a transmitting coil and a receiving coil changes along with the suspension of the automobile, and the coupling coefficient of a magnetic coupling mechanism changes, especially under the condition of uneven road surface. According to the transfer function of series magnetic resonance, the change of the coupling coefficient directly affects the violent fluctuation of the output voltage (V-BUS) of the vehicle-mounted receiving coil, and the fluctuation range can be 500V. If the voltage fluctuation range is too large, the power device of the vehicle-mounted rectifier module can be broken down, the whole wireless charging system fails, the safety of the vehicle is endangered, and the situation must be avoided.
In view of the above problems, the conventional solution adds a voltage detection device and a dc contactor K1 between a receiving coil and a rectification module of the wireless charging system. When the output voltage is detected to be higher than the limit value, the relay K1 is cut off, and the rectification circuit at the later stage is protected. The problem that brings is that rectifier module cuts off, and the vehicle charges in going, if the output voltage of vehicle receiving coil is too high, the system carries out the self-protection, and the vehicle can appear filling the circumstances of going up electricity, and the vehicle can not in time supply the electric energy, probably appears the phenomenon that the vehicle lacks the electric current, influences the normal operating of vehicle, and the vehicle stops to charge in addition, and wireless charging system rate of utilization is too low, the extravagant resource.
Disclosure of Invention
The invention aims to provide a vehicle and a wireless charging system thereof, which are used for solving the problem that the system cannot be charged due to the fact that a rectification module is turned off when the voltage is too high in the overvoltage protection process of the conventional wireless charging, so that the vehicle is lack of power.
In order to realize the wireless overvoltage protection who charges, solve current wireless charging and lead to the extravagant problem of energy when overvoltage protection. The invention provides a wireless charging system of a vehicle, which comprises a receiving end and a rectifying module, wherein the receiving end is used for generating electric energy by matching with a transmitting end of the electric energy, the output end of the receiving end is connected with the alternating current side of the rectifying module, the direct current side of the rectifying module is used for being connected with a power battery for supplying power, the wireless charging system also comprises a voltage detection module and an electric device, the voltage detection module is used for detecting the voltage of the alternating current side or the direct current side of the rectifying module, the electric device is connected with the alternating current side or the direct current side of the rectifying module, and the electric device is controlled to operate to reduce the voltage of the alternating current side or the direct current side of the rectifying module when the voltage of the alternating current side or the direct.
The power battery wireless charging system has the advantages that the receiving end outputs two paths of power supply, one path of power battery is connected, the other path of power battery is connected with the power utilization device, the voltage higher than the upper limit threshold of the safe voltage is consumed or stored through the power utilization device, the voltage of the alternating current side or the direct current side of the rectifying module is reduced, the overvoltage protection of the power battery wireless charging is effectively achieved, and the condition that the system cannot be charged due to the fact that the rectifying module is turned off when the voltage is too high is avoided.
Furthermore, in order to enable the voltage output by the wireless charging receiving end to the power battery to be within a set range and meet the reliable operation of the system, after the system controls the operation of the electric device, when the voltage on the alternating current side or the direct current side of the rectifier module is smaller than a corresponding safety voltage lower limit threshold value, the electric device is controlled to be turned off.
Furthermore, in order to avoid energy waste, redundant electric quantity is stored in a storage battery mode, the electric device comprises an electric energy conversion module, an electric energy input end of the electric energy conversion module is connected with an alternating current side or a direct current side of the rectifier module, and an electric energy output end of the electric energy conversion module is used for being connected with a vehicle-mounted storage battery.
The invention provides a vehicle, which comprises a power battery and a wireless charging system, wherein the wireless charging system comprises a receiving end and a rectifying module, the receiving end is used for generating electric energy by being matched with a transmitting end of the electric energy, the output end of the receiving end is connected with the alternating current side of the rectifying module, the direct current side of the rectifying module is connected with the power battery for supplying power, the wireless charging system also comprises a voltage detection module and an electric device, the voltage detection module is used for detecting the voltage of the alternating current side or the direct current side of the rectifying module, the electric device is connected with the alternating current side or the direct current side of the rectifying module, and the electric device is controlled to operate when the voltage of the alternating current side or the direct current side of the rectifying module is larger than a corresponding upper limit threshold value of safe voltage. The voltage higher than the upper limit threshold of the safe voltage is consumed or stored through the power utilization device, so that the voltage of the alternating current side or the direct current side of the rectifier module is reduced, the overvoltage protection of the wireless charging of the power battery is effectively realized, and the condition that the system cannot be charged due to the fact that the rectifier module is turned off when the voltage is too high is avoided.
Further, in order to enable the voltage output by the wireless charging receiving end to the power battery to be within a set range and meet the reliable operation of the system, after the vehicle controls the operation of the electric device, when the voltage on the alternating current side or the direct current side of the rectifier module is smaller than a corresponding safety voltage lower limit threshold value, the electric device is controlled to be turned off.
Furthermore, in order to avoid energy waste, redundant electric quantity is stored in a storage battery mode, the vehicle further comprises a vehicle-mounted storage battery, the electric device comprises an electric energy conversion module, an electric energy input end of the electric energy conversion module is connected with an alternating current side or a direct current side of the rectification module, and an electric energy output end of the electric energy conversion module is connected with the vehicle-mounted storage battery.
Drawings
Fig. 1 is a schematic diagram of ac control of a wireless charging system of a vehicle of the present invention;
FIG. 2 is a schematic diagram of the DC control of a wireless charging system for a vehicle of the present invention;
FIG. 3 is a topological structure diagram of a differential sampling circuit in the power consumption device of the present invention;
FIG. 4 is a diagram of a power circuit topology in a powered device of the present invention;
fig. 5 is a schematic diagram of the constant current control of the wireless charging system of the present invention;
FIG. 6 is a diagram illustrating the effect of the DC side voltage regulation and the switch of the power utilization device of the present invention;
fig. 7 is a flowchart of a method of controlling a wireless charging system of a vehicle according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
System example 1
The invention provides a wireless charging system of a vehicle, which comprises a receiving end and a rectifying module, wherein the receiving end is used for generating electric energy by being matched with a transmitting end of the electric energy, the output of the receiving end is connected with an alternating current side of the rectifying module, and a direct current side of the rectifying module is used for being connected with a power battery for supplying power; the wireless charging system further comprises a voltage detection module and an electric device, wherein the voltage detection module is used for detecting the voltage of the alternating current side or the direct current side of the rectification module, and the electric energy input end of the electric device is connected with the alternating current side or the direct current side of the rectification module.
When the voltage of the alternating current side of the rectifying module is detected to be larger than the upper limit threshold of the safe voltage of the alternating current side by the voltage detection module, the electric device is controlled to operate, so that the voltage of the alternating current side of the rectifying module is reduced, and the rectifying module and the power battery are prevented from being damaged by overhigh voltage. After the electric device is controlled to operate, when the alternating-current side voltage of the rectifying module is smaller than the safe voltage lower limit threshold value of the alternating-current side, the electric device is controlled to be closed, the alternating-current side voltage of the rectifying module is enabled to be between the safe voltage lower limit threshold value and the safe voltage upper limit threshold value which are set aiming at the alternating-current side, and the reliable operation of the system is met.
When the voltage detection module detects that the direct current side voltage of the rectifier module is greater than the safe voltage upper limit threshold value of the direct current side, the power utilization device is controlled to operate, so that the direct current side voltage of the rectifier module is reduced, the power battery is prevented from being damaged by overhigh voltage, and meanwhile, the rectifier module is prevented from being damaged by overhigh voltage continuously. After the electric device is controlled to operate, when the direct current side voltage of the rectifying module is smaller than the safe voltage lower limit threshold value of the direct current side, the electric device is controlled to be closed, the direct current side voltage of the rectifying module is enabled to be between the safe voltage lower limit threshold value and the safe voltage upper limit threshold value which are set aiming at the direct current side, and the reliable operation of the system is met.
As shown in fig. 1 and 2, the wireless charging portion at the non-vehicle end, i.e., the ground end, is the prior art, and is not described again in the present invention, and the wireless charging system at the vehicle end further includes a wireless transmitting module, a signal input end of the wireless transmitting module is used for connecting a power battery, and a signal output end of the wireless transmitting module is used for communicating with a wireless receiving module arranged at the transmitting end. The receiving end is preferably a receiving end coil, and the transmission of the electric energy is realized through electromagnetic energy conversion with the transmitting end coil.
System embodiment 2
The present invention provides a wireless charging system for a vehicle, which is described in embodiment 2 of the present invention, based on embodiment 1 of the present invention, by taking an example in which a voltage detection module in embodiment 1 detects a dc side of a rectification module, and an electric energy input terminal of an electric device is connected to the dc side of the rectification module, as shown in fig. 2. In addition, in embodiment 2 of the present system, for example, the dc side safe voltage lower limit threshold of the rectifier module is 750V, and the dc side safe voltage upper limit threshold is 860V.
As shown in fig. 3, the sampling circuit adopted by the voltage detection module is a differential sampling circuit, and the sampled value Vor is provided to the AD port of the DSP. Vor is a control target, and the control target of the electric device is to control the V-BUS to be 860V or less. The working condition of the electric device is judged according to the sampling value Vor of the direct current side of the rectifier module, when the direct current side voltage of the rectifier module is detected to be higher than 860V, in order to guarantee the normal work of the system, the electric device needs to be started at the moment to limit the direct current side voltage of the rectifier module, and the reliable operation of the system is met.
The power utilization device can be energy-consuming power utilization equipment or energy-storing power utilization equipment; energy-consuming electric devices, such as resistors, motors, vehicle air conditioners, vehicle radiators, vehicle heaters, and the like; energy storage type electric devices, such as a storage battery, a super capacitor, and the like; some of the devices are used for alternating current, and voltage and current on the direct current side can be converted according to actual conditions. In embodiment 2 of the system, the electric device is taken as an example of an energy storage type electric device, and the electric device includes an electric energy conversion module and a storage battery, where the storage battery may be a storage battery newly added to the system, or a vehicle-mounted storage battery in a vehicle to which the system is applied.
As shown in fig. 4, the power circuit of the power conversion module adopts a three-level half-bridge topology structure, 4 MOS transistors are applied, and the tube withstand voltage value is 650V, which can withstand 1300V. Q1 and Q2 are simultaneously turned on, Q3 and Q4 are simultaneously turned on, the device is in a constant current working mode, and the alternating current side voltage of the rectifier module is ensured to work at 750V-860V.
As shown in fig. 5, the control mode of the electric energy conversion module adopts a constant current control mode, and the amount of the constant current is determined according to the voltage on the direct current side of the rectification module, which is different from the common control mode. The controlled reference REF is a continuous adjustable voltage of 750V-860V, the feedback quantity is a direct-current side voltage V-BUS of the rectifier module, the reference and the V-BUS are compared to obtain an error quantity, and the error quantity is controlled and operated through PI _ Control1 to obtain a final Control quantity PI _ OUT1 of the electric energy conversion module. PI _ OUT1 is used as a Control reference of the electric energy conversion module, an error value is obtained by comparing the Control reference with the sampling, PI _ OUT2 is obtained by PI _ Control2 Control operation, and the voltage of the V-BUS is between 750V and 860V according to the value of the Control output quantity PI _ OUT 2.
As shown in fig. 6, the voltage range of the V-BUS is controlled between 750V and 860V by controlling the on and off of the electric device, and the voltage higher than the upper limit threshold of the safe voltage is supplied to the storage battery for charging, so that the overvoltage protection of the wireless charging of the power battery is effectively realized, the energy is recovered, and the waste of the energy is reduced.
Vehicle embodiment 1
The present invention provides a vehicle including a power battery and a wireless charging system, which has been described in detail in the above system embodiment 1 and will not be described again. The vehicle comprises the power battery and the wireless charging system, and other components are all components in the existing wireless charging vehicle and are used for forming the whole vehicle.
The electric device in the wireless charging system can be energy-consuming electric equipment and also can be energy-storing electric equipment; energy-consuming electric devices, such as resistors, motors, vehicle air conditioners, vehicle radiators, vehicle heaters, and the like; energy storage type electric devices, such as a storage battery, a super capacitor, and the like; when the alternating current side of the rectifier module is connected, the alternating current electric equipment in the electric equipment can be adopted, or the direct current electric equipment in the electric equipment can be adopted after voltage-current conversion; when the dc side of the rectifier module is connected, a dc electric device in the electric device may be used, or an ac electric device in the electric device may be used after voltage-current conversion.
Vehicle embodiment 2
The invention provides a vehicle, which comprises a power battery, a storage battery and a wireless charging system, wherein the wireless charging system is the wireless charging system in the system embodiment 2, and details are not repeated herein.
The vehicle adopts a control method of a wireless charging system, as shown in fig. 7, an electric energy conversion module is used for being connected with a storage battery for supplying power, when the voltage is less than 750V, the electric energy conversion module is closed, and a rectification module is started for wirelessly charging the vehicle; when the voltage is higher than 860V, the electric energy conversion module is started to charge the storage battery, the voltage of the storage battery is judged at the moment, when the voltage of the storage battery is smaller than 20V, the voltage of the storage battery is smaller, the storage battery is charged by starting the vehicle-mounted DC-DC, the electric energy conversion module is not started at the moment, the power supply source of the electric energy conversion module is converted from useless power generated inside a circuit, the power of the power supply is changed along with the power of the wireless charging system, the characteristic of uncertain output power is achieved, and the phenomenon that the storage battery is too low in voltage and cannot be charged by the electric energy conversion module is prevented.
The present invention is not limited to the embodiments described above, and the objects of the present invention can be achieved by changing, replacing, and modifying the technical means in the above-described embodiments in a manner that will be easily understood by those skilled in the art.
Claims (6)
1. The wireless charging system is characterized by further comprising a voltage detection module and an electric device, wherein the voltage detection module is used for detecting the voltage of the alternating current side or the direct current side of the rectification module, the electric device is connected with the alternating current side or the direct current side of the rectification module, and when the voltage of the alternating current side or the direct current side of the rectification module is larger than a corresponding safe voltage upper limit threshold value, the electric device is controlled to operate so as to reduce the voltage of the alternating current side or the direct current side of the rectification module.
2. The wireless charging system of a vehicle according to claim 1, wherein after controlling the operation of the electric device, the electric device is controlled to be turned off when the voltage on the ac side or the dc side of the rectifier module is less than the corresponding safety lower voltage limit threshold.
3. The wireless charging system of the vehicle according to claim 1 or 2, wherein the power utilization device comprises a power conversion module, a power input end of the power conversion module is connected with an alternating current side or a direct current side of the rectification module, and a power output end of the power conversion module is used for being connected with an on-vehicle storage battery.
4. The utility model provides a vehicle, includes power battery and wireless charging system, wireless charging system is including receiving terminal and the rectifier module that is used for producing the electric energy with the transmitting terminal matching of electric energy, and receiving terminal output connection rectifier module's AC side, rectifier module's direct current side is connected power battery supplies power, its characterized in that still includes voltage detection module and the power consumption device that is used for detecting rectifier module's AC side or direct current side voltage, power consumption device's electric energy input end connects rectifier module's AC side or direct current side, and when rectifier module's AC side or direct current side voltage were greater than corresponding safe voltage upper limit threshold value, control power consumption device moves to reduce rectifier module's AC side or direct current side voltage.
5. The vehicle of claim 4, wherein after controlling the electric device to operate, the electric device is controlled to shut down when the voltage on the AC side or the DC side of the rectifier module is less than the corresponding lower safe voltage threshold.
6. The vehicle of claim 4 or 5, characterized in that the vehicle further comprises an on-board battery, the power utilization device comprises a power conversion module, a power input end of the power conversion module is connected with the alternating current side or the direct current side of the rectification module, and a power output end of the power conversion module is connected with the on-board battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811162886.4A CN110970985A (en) | 2018-09-30 | 2018-09-30 | Vehicle and wireless charging system thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811162886.4A CN110970985A (en) | 2018-09-30 | 2018-09-30 | Vehicle and wireless charging system thereof |
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| CN110970985A true CN110970985A (en) | 2020-04-07 |
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| CN201811162886.4A Pending CN110970985A (en) | 2018-09-30 | 2018-09-30 | Vehicle and wireless charging system thereof |
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| CN105529839A (en) * | 2014-10-16 | 2016-04-27 | 恩智浦有限公司 | Front-end circuits for wireless power receivers, wireless chargers and wireless charging |
| CN106415989A (en) * | 2014-07-03 | 2017-02-15 | 英特尔公司 | Apparatus, system and method of wireless power transfer |
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2018
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| CN103107585A (en) * | 2006-09-29 | 2013-05-15 | 捷通国际有限公司 | System and method for inductively charging a battery |
| KR20110073108A (en) * | 2009-12-23 | 2011-06-29 | 한국과학기술원 | Power supply system and method for non contact electromagnetic inductive charging of electric vehicle |
| CN104604083A (en) * | 2012-08-29 | 2015-05-06 | 高通股份有限公司 | Wireless power overvoltage protection circuit with reduced power dissipation |
| CN106415989A (en) * | 2014-07-03 | 2017-02-15 | 英特尔公司 | Apparatus, system and method of wireless power transfer |
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Application publication date: 20200407 |