CN112637818A - Wireless charging communication connection method, device and communication system - Google Patents

Wireless charging communication connection method, device and communication system Download PDF

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Publication number
CN112637818A
CN112637818A CN202011432783.2A CN202011432783A CN112637818A CN 112637818 A CN112637818 A CN 112637818A CN 202011432783 A CN202011432783 A CN 202011432783A CN 112637818 A CN112637818 A CN 112637818A
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frequency
vehicle
configuration information
byte data
binary byte
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CN112637818B (en
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杨进
胡超
罗勇
陈振伟
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Zhongxing New Energy Technology Co ltd
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Zhongxing New Energy Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/48—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for in-vehicle communication
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/12—Inductive energy transfer
    • B60L53/126—Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • 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
    • 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
    • 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
    • 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
    • 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
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/20—Information technology specific aspects, e.g. CAD, simulation, modelling, system security

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention discloses a communication connection method, equipment and a communication system for wireless charging, wherein the communication connection method for wireless charging comprises the following steps: after a parking signal of the vehicle-mounted equipment is detected, binary byte data converted from local configuration information is transmitted to the vehicle-mounted equipment through frequency modulation, so that the vehicle-mounted equipment carries out frequency demodulation to obtain the binary byte data, then the binary byte data is analyzed to obtain the local configuration information, and finally communication connection is realized based on the local configuration information. According to the technical scheme, the transmission of the configuration information of the ground communication module is realized by adopting a method of modulating the frequency of the ground equipment and demodulating the frequency of the corresponding vehicle-mounted equipment through the power coil and the control module of the wireless charging system, so that the cost is low, and the reliability is high.

Description

Wireless charging communication connection method, device and communication system
Technical Field
The present invention relates to the field of wireless charging technologies, and in particular, to a communication connection method, a device, and a communication system for wireless charging.
Background
The wireless charging technology is a novel charging technology which is started in recent years, and can charge electric equipment in a certain space range without charging wires. The Wireless Power transmission method is mainly based on a Wireless Power transmission technology, electric energy is transmitted to an electric equipment end from a Power end in a non-contact mode by using the principles of magnetic resonance coupling, laser, microwave and the like, Wireless charging/Power supply of the electric equipment is realized, and the Wireless Power transmission method has the advantages of safety, reliability, flexibility, convenience, environmental friendliness, all-weather working and the like, and is widely concerned.
Before charging an electric vehicle based on a non-contact power transmission technology, a communication device at a vehicle-mounted end needs to handshake with a communication device at a ground end to establish a communication channel, and the process is generally completed in a vehicle backing process or when the vehicle stops at a parking space. At present, the physical layer of communication between the ground equipment and the vehicle-mounted equipment of the wireless charging system of the electric vehicle is standardized and conforms to IEEE 802.11n, namely, the communication is carried out through WiFi. Generally, each ground device is provided with a WiFi communication module and set to be in an AP mode, and each vehicle-mounted device is provided with a WiFi communication module and set to be in an STA mode; the vehicle-mounted terminal WiFi communication module is automatically connected with the ground WiFi after acquiring information such as an IP address, a password and the like of the ground terminal WiFi communication module. However, before the communication service selection starts, the in-vehicle device and the ground device do not establish a communication channel. Existing solutions generally use rfid (radio Frequency identification) technology: the WIFI SSID and the password information of the ground equipment are arranged in the ground coil module, the card reader is arranged in the vehicle-mounted receiving coil module, and the WIFI SSID and the password of the ground equipment of the parking space are acquired by automatically scanning the tag after the vehicle is parked. However, this method not only increases the cost, but also makes the equipment bulky, and the installation of the device on the vehicle-mounted equipment is more difficult.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a communication connection method, a device and a communication system for wireless charging, which achieve transmission of configuration information of a ground communication module by using a ground device frequency modulation method and a corresponding vehicle-mounted device frequency demodulation method through a power coil and a control module of the wireless charging system, and have low cost and high reliability. The technical scheme is as follows:
the embodiment of the invention provides a communication connection method for wireless charging, which comprises the following steps:
detecting a parking signal of a vehicle-mounted device;
reading pre-stored binary byte data converted from local configuration information, wherein the local configuration information comprises a wifi name and a password;
when a full-bridge rectification circuit of the vehicle-mounted equipment is in a short-circuit state, starting frequency modulation, transmitting the binary byte data to the vehicle-mounted equipment so that the vehicle-mounted equipment carries out frequency demodulation to obtain the binary byte data, and then carrying out analysis to obtain the local configuration information and then establishing wireless connection;
and stopping frequency modulation after receiving a confirmation signal of successful demodulation returned by the vehicle-mounted equipment in a wireless communication mode, and finishing communication connection.
Preferably, the turning on frequency modulation transmits the binary byte data to the vehicle-mounted device, specifically:
starting a charging system according to a preset micro-current;
and carrying out bit-by-bit transmission on the data bits in each byte of the binary byte data by frequency modulation according to the one-to-one correspondence relationship of the starting frequency, the high level frequency and the low level frequency with the starting bit, 1 and 0 respectively, wherein one starting bit is transmitted before each data bit is transmitted.
Preferably, the difference between the high level frequency and the low level frequency is at least 10KHz, and the starting frequency is an average value of the high level frequency and the low level frequency and is a working resonant frequency of the charging system.
Preferably, the transmission duration of each data bit is greater than a preset first time threshold, where the first time threshold is any value in 500 to 1000 switching frequency cycles.
Preferably, after the binary byte data are completely transmitted, when a confirmation signal of successful demodulation returned by the vehicle-mounted device is not received beyond a preset second time threshold, the binary byte data are retransmitted.
Preferably, the detection of the parking signal of the vehicle-mounted device is performed by at least one of a radar monitoring device, a monitoring shooting device and a mutual inductance detection device.
Preferably, the binary byte data converted from the local configuration information is written into a local FLASH chip or EEPROM chip in advance.
Another embodiment of the present invention provides a wireless charging communication connection method, including the steps of:
controlling a local full-bridge rectifying circuit to be in a short-circuit state;
carrying out frequency sampling on local current/voltage in real time;
converting the frequency sampling sequence into binary byte data through frequency demodulation according to the one-to-one correspondence of the starting frequency, the high level frequency and the low level frequency with the starting bit, 1 and 0 respectively;
analyzing the binary byte data to obtain configuration information of the ground equipment, wherein the configuration information comprises a wifi name and a password;
and establishing wireless connection with the ground equipment based on the configuration information, and sending a confirmation signal of successful demodulation to the ground equipment in a wireless communication mode so as to stop frequency modulation information transmission of the ground equipment.
Preferably, the binary byte data comprises a frame header, a total data length, a checksum and a frame tail;
then, the analyzing the binary byte data to obtain configuration information of the ground device specifically includes:
according to a set data frame format, performing frame head, frame tail, total data length and check judgment on the binary byte data;
and extracting effective data bytes after the judgment is passed, and analyzing to obtain configuration information of the ground equipment.
Still another embodiment of the present invention provides a ground communication control apparatus including:
the detection unit is used for detecting a parking signal of a vehicle-mounted device;
the data reading unit is used for reading pre-stored binary byte data converted from local configuration information, wherein the local configuration information comprises a wifi name and a password;
the frequency modulation unit is used for starting frequency modulation when a full-bridge rectification circuit of the vehicle-mounted equipment is in a short-circuit state, and transmitting the binary byte data to the vehicle-mounted equipment so that the vehicle-mounted equipment can analyze the received binary byte data to obtain the local configuration information and then establish wireless connection;
and the first communication unit is used for stopping frequency modulation after receiving the confirmation signal of successful demodulation returned by the vehicle-mounted equipment in a wireless communication mode, and finishing communication connection.
Preferably, the frequency modulation unit includes a micro start module and a frequency control module, and specifically includes:
the micro-starting module is used for starting the charging system according to a preset micro-current;
the frequency control module is used for carrying out bit-by-bit transmission on data bits in each byte of the binary byte data through frequency modulation according to the one-to-one correspondence relationship between the starting frequency, the high level frequency and the low level frequency and the starting bit, 1 and 0 respectively, wherein one starting bit is transmitted before each data bit is transmitted.
Preferably, the ground communication control device further includes a storage unit, specifically:
and the storage unit is used for storing binary byte data converted from the local configuration information.
Another embodiment of the present invention provides a vehicle-mounted communication control apparatus, including:
the circuit control unit is used for controlling the local full-bridge rectifying circuit to be in a short-circuit state;
the frequency sampling unit is used for sampling the local current/voltage in real time;
a conversion unit for converting the frequency sampling sequence into binary byte data by frequency demodulation according to the one-to-one correspondence of the start frequency, the high level frequency and the low level frequency with the start bit, 1 and 0, respectively;
the analysis unit is used for analyzing the binary byte data to obtain configuration information of the ground equipment, wherein the configuration information comprises a wifi name and a password;
and the second communication unit is used for establishing wireless connection with the ground equipment based on the configuration information and sending a confirmation signal of successful demodulation to the ground equipment in a wireless communication mode so as to stop the transmission of the frequency modulation information by the ground equipment.
Another embodiment of the present invention provides a wireless charging communication system, including:
the ground communication control device and the vehicle communication control device.
According to the technical scheme provided by the invention, binary byte data converted from local configuration information is transmitted to the vehicle-mounted equipment through frequency modulation, so that the vehicle-mounted equipment carries out frequency demodulation to obtain the binary byte data, then carries out analysis to obtain the local configuration information, and finally realizes communication connection based on the local configuration information. That is to say, the technical scheme of the invention adopts the frequency modulation of the ground equipment through the power coil and the control module of the wireless charging system, realizes the transmission of the configuration information of the ground communication module by a method corresponding to the frequency demodulation of the vehicle-mounted equipment, and has low cost and high reliability.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a topology circuit structure diagram of a wireless charging system provided by the present invention.
Fig. 2 is a flowchart of a method for connecting a wireless charging communication according to an embodiment of the present invention.
Fig. 3 is a topology circuit structure diagram of a wireless charging system in a short-circuit state according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a three-band operation method according to an embodiment of the present invention.
Fig. 5 is a flowchart of a method for connecting a wireless charging communication according to a second embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a ground communication control device according to a third embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a vehicle-mounted communication control apparatus according to a fourth embodiment of the present invention.
Fig. 8 is a schematic structural diagram of a wireless charging communication system according to a fifth embodiment of the present invention.
Fig. 9 is a schematic structural diagram of a wireless charging system according to a fifth embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
Referring to fig. 1, a topology circuit structure diagram of a wireless charging system is shown, where the topology circuit structure includes a primary side and a vehicle-mounted side, and the primary side includes a dc power supply 1, a full-bridge inverter circuit 2, a primary side compensation circuit 3, and a primary side coil LP(ii) a The vehicle-mounted end comprises a secondary coil LSA secondary side compensation circuit 4, a full-bridge rectification circuit 5 and a filter capacitor C0And a load device 6; wherein the primary coil LPAnd a secondary winding LSTransmitting and receiving means for the energy of the loosely coupled transformer, respectively, with currents IPAnd IS(ii) a The full-bridge inverter circuit 2 is composed of four switching tubes QP1、QP2、QP3And QP4The full-bridge rectification circuit 5 is also composed of four switching tubes QS1、QS2、QS3And QS4The switch tube can be one of switching devices such as a mos tube and an insulated gate bipolar transistor; the full-bridge inverter circuit 2 is responsible for converting direct current VdcConverted into high-frequency power and passed through primary winding L of loosely coupled transformerPThe full-bridge rectification circuit 5 is responsible for rectifying high-frequency electricity and adjusting system resonance parameters or output power in a phase-shifting or duty ratio adjusting mode and the like; the secondary side compensation circuit 4 is formed by connecting a capacitor C in seriesSParallel capacitor C2And a series inductance L2LCC compensation circuit formed by mutual connection, and parallel capacitor C2Is connected to the series capacitor CSAnd the series inductance L2Said series inductance L2Is connected to a bridge arm center point of the full-bridge rectification circuit 5The parallel capacitor C2And the other bridge arm central point of the full-bridge rectifying circuit 5 is connected. The input current of the full-bridge rectification circuit 5 is IeAt a midpoint voltage of VeThen its equivalent resistance Re＝Ve/Ie。
Example one
Referring to fig. 2, a flowchart of a method of a wireless charging communication connection method is shown. The communication connection method for wireless charging provided by the present embodiment may be executed by a ground device, or may be executed by a device disposed on the ground device side. The communication connection method comprises steps S11-S14, and specifically comprises the following steps:
s11, a parking signal of the vehicle-mounted equipment is detected.
Preferably, the local vehicle detection function is automatically triggered when the charging vehicle enters the parking space. The vehicle detection function may be, but is not limited to, at least one of a radar monitoring device, a monitoring shooting device, and a mutual inductance detection device, and other detection methods for determining that the vehicle is parked in the local parking space are within the protection scope of the present invention, and are not specifically limited herein.
In a preferred embodiment, the vehicle detection function may use a primary and secondary coil coupling mutual inductance detection device to determine whether a vehicle is parked in a local parking space, specifically: firstly, starting a program and initializing, and reading a coupling mutual inductance value threshold of an original secondary side coil; then, the mutual inductance detection device periodically detects the coupling mutual inductance value of the primary coil and the secondary coil; finally, judging whether a vehicle exists or not by comparing the current mutual inductance value with the threshold value; when the current mutual inductance value is larger than the threshold value, judging that a vehicle enters a local parking space, the mutual inductance detection device sends a parking signal to local equipment, and otherwise, the local equipment controls the vehicle detection program to be in standby.
In another preferred embodiment, the vehicle detection function may adopt a radar monitoring device to determine whether a vehicle enters a local parking space, wherein the radar monitoring device includes a plurality of millimeter-wave radars; the method specifically comprises the following steps: firstly, initializing a starting program, reading a living object detection distance threshold value, an address number of each radar and the like; then, the radar detection device reads the initial detection distance of each radar, and then periodically reads the detection distance of each radar; finally, judging whether a vehicle enters the local area or not by comparing the current detection distance with the living object detection distance threshold value and combining the initial detection distance, the historical detection distance and the change condition of the current detection distance; and when judging that a vehicle enters a local parking space, the radar monitoring device sends a parking signal to local equipment, and otherwise, the local equipment controls the vehicle detection program to be standby.
In another preferred embodiment, the vehicle detection function may adopt a monitoring camera to determine whether a vehicle enters a local parking space, specifically: firstly, initializing a starting program, and reading a vehicle license plate number position threshold value in a shot picture; then, the monitoring shooting device periodically shoots pictures and acquires the position of the license plate number of the vehicle in each shot picture in real time; finally, judging whether a vehicle exists or not by comparing the position of the license plate number of the vehicle in the current shot picture with the threshold value; when the position of the license plate number of the vehicle in the current shot picture is smaller than the threshold value, judging that the vehicle enters a local parking space, sending a parking signal to local equipment by the monitoring shooting device, and otherwise, controlling the vehicle detection program to be standby by the local equipment.
And S12, reading pre-stored binary byte data converted from local configuration information, wherein the local configuration information comprises a wifi name and a password.
Preferably, the binary byte data converted from the local configuration information is written into a local FLASH chip or EEPROM chip in advance.
And S13, when the full-bridge rectification circuit of the vehicle-mounted equipment is in a short-circuit state, starting frequency modulation, and transmitting the binary byte data to the vehicle-mounted equipment so that the vehicle-mounted equipment carries out frequency demodulation to obtain the binary byte data, and then carries out analysis to obtain the local configuration information and then establishes wireless connection.
Referring to fig. 3, a wireless charging system is shownThe topology circuit structure diagram in the short-circuit state of (1). The full-bridge rectification circuit 5 is in a short-circuit state, specifically, Q in the full-bridge rectification circuit 5S1And QS2On, or QS3And QS4When the full-bridge rectification circuit 5 is conducted, the midpoint voltage V of the full-bridge rectification circuit 5 iseIs 0, its equivalent resistance ReIs also 0; at this time, the compensation capacitor C2And a compensation inductance L2And (4) connecting in parallel.
Preferably, the step S13 specifically includes:
s131, starting a charging system according to a preset micro-current;
and S132, carrying out bit-by-bit transmission on the data bits in each byte of the binary byte data through frequency modulation according to the one-to-one correspondence relationship between the starting frequency, the high level frequency and the low level frequency and the starting bit, 1 and 0 respectively, wherein one starting bit is transmitted before each data bit is transmitted.
Referring also to fig. 4, a schematic diagram of a three-band operation is shown. The method specifically comprises the following steps: outputting a tiny current through the direct current power supply 1, and starting the full-bridge inverter circuit 2; the full-bridge inverter circuit 2 operates according to a three-frequency band: starting frequency f0High level frequency f1And low level frequency f2The frequency conversion work is carried out in one-to-one correspondence with the start bit, 1 and 0 respectively, so that the data bits in each byte of the binary byte data are transmitted bit by bit, wherein one start bit is transmitted before each data bit is transmitted. Preferably, the starting frequency f0For the operating frequency of the wireless charging system, i.e. the compensation capacitor C2And the compensation inductance L2The resonant frequency of (d); the difference between the high level frequency and the low level frequency is at least 10KHz, and the starting frequency is the average value of the high level frequency and the low level frequency. Because the starting frequency adopts the working frequency of the wireless charging system, and the difference between the high level frequency and the low level frequency is that the starting frequency has a certain frequency interval, the robustness of the system to frequency change is improved, the advantage of resisting frequency selective interference is achieved, and the frequency selective interference is reducedThe error rate of data transmission is improved.
Preferably, to improve the resolution of frequency demodulation, the transmission duration of each data bit is greater than a preset first time threshold, and specifically, the first time threshold is any value of 500 to 1000 switching frequency cycles.
And S14, stopping frequency modulation after receiving the confirmation signal of successful demodulation returned by the vehicle-mounted equipment in a wireless communication mode, and completing communication connection.
In specific implementation, before step S14, the method further includes: and after the binary byte data are completely transmitted, when a confirmation signal of successful demodulation returned by the vehicle-mounted equipment is not received beyond a preset second time threshold, retransmitting the binary byte data.
According to the communication connection method for wireless charging, when the local vehicle detection function detects that the charging vehicle stops at a local parking space, the full-bridge rectification circuit of the vehicle-mounted equipment is in a short-circuit state, the charging system is started by preset micro-current, the charging system is controlled to transmit binary byte data converted from local configuration information to the vehicle-mounted equipment according to a three-frequency-band working method, so that the vehicle-mounted equipment carries out frequency demodulation to obtain the binary byte data, then carries out analysis to obtain the local configuration information, and finally realizes communication connection based on the local configuration information. That is, the present embodiment realizes the transmission of the configuration information of the local communication module by the frequency modulation method, and has low cost and high reliability.
Example two
Referring to fig. 5, a flowchart of a method of a wireless charging communication connection method is shown. The communication connection method for wireless charging provided by the present embodiment may be executed by an in-vehicle device, or may be executed by a device disposed on the side of the in-vehicle device. The communication connection method comprises S21-S25, and specifically comprises the following steps:
and S21, controlling the local full-bridge rectification circuit to be in a short-circuit state.
Specifically, Q in the full-bridge rectification circuit 5 is setS1And QS2On, or QS3And QS4When the full-bridge rectification circuit 5 is conducted, the midpoint voltage V of the full-bridge rectification circuit 5 iseIs 0, its equivalent resistance ReIs also 0; at this time, the compensation capacitor C2And a compensation inductance L2And (4) connecting in parallel.
S22, frequency sampling the local current/voltage in real time.
Preferably, the step S22 specifically includes: sampling local current/voltage in real time, wherein the local current/voltage may be but is not limited to: the secondary coil LSCurrent/voltage of, said compensation inductance L2Current/voltage on, etc.; and then, acquiring the real-time frequency information of the local current/voltage, and finally obtaining a frequency sampling sequence.
S23, the frequency sample sequence is converted into binary byte data by frequency demodulation according to the one-to-one correspondence of the start frequency, the high level frequency, and the low level frequency with the start bit, 1, and 0, respectively.
S24, analyzing the binary byte data to obtain configuration information of the ground equipment, wherein the configuration information comprises a wifi name and a password.
Preferably, the binary byte data comprises a frame header, a total data length, a checksum and a frame tail;
then, the analyzing the binary byte data to obtain configuration information of the ground device specifically includes:
according to a set data frame format, performing frame head, frame tail, total data length and check judgment on the binary byte data;
and extracting effective data bytes after the judgment is passed, and analyzing to obtain configuration information of the ground equipment.
And S25, establishing wireless connection with the ground equipment based on the configuration information, and sending a confirmation signal of successful demodulation to the ground equipment in a wireless communication mode so as to stop frequency modulation information transmission of the ground equipment.
In the communication connection method for wireless charging provided by this embodiment, a local full-bridge rectifier circuit is controlled to be in a short-circuit state, and local current/voltage frequency information is sampled in real time to obtain a frequency sampling sequence; then, demodulating the frequency sampling sequence according to a three-frequency-band working method to obtain binary byte data; analyzing the binary byte data to obtain configuration information of the ground equipment; and finally, establishing wireless connection with the ground equipment based on the configuration information. That is, the embodiment realizes the acquisition of the configuration information of the ground communication module by the frequency demodulation method, and has low cost and high reliability.
EXAMPLE III
Referring to fig. 6, a schematic structural diagram of a ground communication control device is shown. The ground communication control device provided in this embodiment may execute all the processes of the communication connection method for wireless charging provided in the first embodiment. The ground communication control device 30 includes a detection unit 31, a data reading unit 32, a frequency modulation unit 33, and a first communication unit 34, and specifically includes the following:
the detecting unit 31 is configured to detect a parking signal of a vehicle-mounted device.
Preferably, the detection unit 31 may employ, but is not limited to: at least one of a radar monitoring device, a monitoring shooting device and a mutual inductance detection device.
The data reading unit 32 is configured to read pre-stored binary byte data converted from local configuration information, where the local configuration information includes a wifi name and a password.
Preferably, the ground communication control device 30 further includes: a storage unit 35;
the storage unit 35 is configured to store binary byte data converted from local configuration information. Specifically, the storage unit 35 may be, but is not limited to: FLASH chip and EEPROM chip.
The frequency modulation unit 33 is configured to start frequency modulation when the full-bridge rectification circuit of the vehicle-mounted device is in a short-circuit state, and transmit the binary byte data to the vehicle-mounted device, so that the vehicle-mounted device analyzes the received binary byte data to obtain the local configuration information and then establishes a wireless connection.
Preferably, the frequency modulation unit 33 specifically includes a micro start module 33a and a frequency control module 33b, specifically:
the micro-starting module 33a is used for starting the charging system according to a preset micro-current;
the frequency control module 33b is configured to perform bit-by-bit transmission on data bits in each byte of the binary byte data by frequency modulation according to a one-to-one correspondence relationship between a start frequency, a high level frequency, and a low level frequency, and start bits, 1, and 0, respectively, where one start bit is transmitted before each data bit is transmitted.
It should be noted that, when the detecting unit 31, the data reading unit 32, the frequency modulating unit 33 and the first communicating unit 34 are implemented, the implementation of steps S11 to S14 of the wireless charging communication connection method provided in the first embodiment may be correspondingly adopted, and therefore, the description of this embodiment is not repeated.
Example four
Referring to fig. 7, a schematic structural diagram of a vehicle-mounted communication control apparatus is shown. The vehicle-mounted communication control device provided in this embodiment can execute all the procedures of the wireless charging communication connection method provided in the second embodiment. The vehicle-mounted communication control device 40 includes a circuit control unit 41, a frequency sampling unit 42, a conversion unit 43, an analysis unit 44, and a second communication unit 45, and specifically includes the following:
the circuit control unit 41 is configured to control the local full-bridge rectifier circuit to be in a short-circuit state.
Specifically, Q in the full-bridge rectification circuit 5 is setS1And QS2On, or QS3And QS4When the full-bridge rectification circuit 5 is conducted, the midpoint voltage V of the full-bridge rectification circuit 5 iseIs 0, its equivalent resistance ReIs also 0; at this time, the compensation capacitor C2And a compensation inductance L2And (4) connecting in parallel.
The frequency sampling unit 42 is used for performing frequency sampling on the local current/voltage in real time.
The conversion unit 43 is configured to convert the frequency sampling sequence into binary byte data through frequency demodulation according to the one-to-one correspondence relationship between the start frequency, the high level frequency, and the low level frequency and the start bit, 1, and 0, respectively.
The parsing unit 44 is configured to parse the binary byte data to obtain configuration information of the ground device, where the configuration information includes a wifi name and a password.
Preferably, the binary byte data comprises a frame header, a total data length, a checksum and a frame tail;
the parsing unit 44 is specifically configured to:
according to a set data frame format, performing frame head, frame tail, total data length and check judgment on the binary byte data;
and extracting effective data bytes after the judgment is passed, and analyzing to obtain configuration information of the ground equipment.
The second communication unit 45 is configured to establish a wireless connection with the ground device based on the configuration information, and send a confirmation signal of successful demodulation to the ground device in a wireless communication manner, so that the ground device stops frequency modulation information transmission.
It should be noted that, when the circuit control unit 41, the frequency sampling unit 42, the converting unit 43, the analyzing unit 44 and the second communicating unit 45 are implemented, the implementation of steps S21 to S25 of the wireless charging communication connection method provided in the second embodiment can be correspondingly adopted, and therefore, the description of this embodiment is not repeated.
EXAMPLE five
Referring to fig. 8, a schematic structural diagram of a wireless charging communication system is shown. The wireless charging communication system may include:
the ground communication control apparatus 30 shown in the third embodiment and the vehicle communication control apparatus 10 shown in the fourth embodiment.
Fig. 9 is a schematic diagram of a wireless charging system. The wireless charging system comprises a ground device 1 and a vehicle-mounted device 2; the ground equipment 1 is connected with a power grid and comprises wall-mounted equipment 10, primary side equipment 20 and ground communication control equipment 30; the in-vehicle device 2 is provided in a charging vehicle, and includes an in-vehicle communication control device 40. Each ground device 1 comprises a WiFi module, each WiFi module may be configured with an independent IP address and password, or several adjacent WiFi modules share one IP address and password, and are set to an AP mode and installed in the primary device 20; each of the in-vehicle apparatuses 2 includes a WiFi module in the STA mode.
In summary, according to the communication connection method, the device and the communication system for wireless charging provided by the present invention, the binary byte data converted from the local configuration information is transmitted to the vehicle-mounted device through frequency modulation, so that the vehicle-mounted device performs frequency demodulation to obtain the binary byte data, performs analysis to obtain the local configuration information, and finally implements communication connection based on the local configuration information. That is to say, the technical scheme of the invention adopts the frequency modulation of the ground equipment through the power coil and the control module of the wireless charging system, realizes the transmission of the configuration information of the ground communication module by a method corresponding to the frequency demodulation of the vehicle-mounted equipment, and has low cost and high reliability.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.

Claims (14)

1. A method of wirelessly charging a communication connection, the method comprising:
detecting a parking signal of a vehicle-mounted device;
reading pre-stored binary byte data converted from local configuration information, wherein the local configuration information comprises a wifi name and a password;
when a full-bridge rectification circuit of the vehicle-mounted equipment is in a short-circuit state, starting frequency modulation, transmitting the binary byte data to the vehicle-mounted equipment so that the vehicle-mounted equipment carries out frequency demodulation to obtain the binary byte data, and then carrying out analysis to obtain the local configuration information and then establishing wireless connection;
and stopping frequency modulation after receiving a confirmation signal of successful demodulation returned by the vehicle-mounted equipment in a wireless communication mode, and finishing communication connection.
2. The communication connection method for wireless charging according to claim 1, wherein the enabling of frequency modulation and the transmission of the binary byte data to the vehicle-mounted device specifically comprise:
starting a charging system according to a preset micro-current;
and carrying out bit-by-bit transmission on the data bits in each byte of the binary byte data by frequency modulation according to the one-to-one correspondence relationship of the starting frequency, the high level frequency and the low level frequency with the starting bit, 1 and 0 respectively, wherein one starting bit is transmitted before each data bit is transmitted.
3. The communication connection method for wireless charging according to claim 2, wherein the difference between the high level frequency and the low level frequency is at least 10KHz, and the starting frequency is an average value of the high level frequency and the low level frequency and is an operating resonance frequency of the charging system.
4. The method according to claim 2, wherein the transmission duration of each data bit is greater than a preset first time threshold, wherein the first time threshold is any value of 500 to 1000 switching frequency cycles.
5. The wireless charging communication connection method according to claim 1, wherein the binary byte data is retransmitted when a confirmation signal of successful demodulation returned by the vehicle-mounted device is not received beyond a preset second time threshold after the binary byte data is completely transmitted.
6. The communication connection method for wireless charging according to claim 1, wherein the detecting of the parking signal of the vehicle-mounted device is performed by at least one of a radar monitoring device, a monitoring photographing device and a mutual inductance detecting device.
7. The communication connection method for wireless charging according to claim 1, wherein the binary byte data converted from the local configuration information is written in a local FLASH chip or EEPROM chip in advance.
8. A method of wirelessly charging a communication connection, the method comprising:
controlling a local full-bridge rectifying circuit to be in a short-circuit state;
carrying out frequency sampling on local current/voltage in real time;
converting the frequency sampling sequence into binary byte data through frequency demodulation according to the one-to-one correspondence of the starting frequency, the high level frequency and the low level frequency with the starting bit, 1 and 0 respectively;
analyzing the binary byte data to obtain configuration information of the ground equipment, wherein the configuration information comprises a wifi name and a password;
and establishing wireless connection with the ground equipment based on the configuration information, and sending a confirmation signal of successful demodulation to the ground equipment in a wireless communication mode so as to stop frequency modulation information transmission of the ground equipment.
9. The wireless charging communication connection method according to claim 8, wherein the binary byte data comprises a frame header, a total data length, a checksum frame end;
then, the analyzing the binary byte data to obtain configuration information of the ground device specifically includes:
according to a set data frame format, performing frame head, frame tail, total data length and check judgment on the binary byte data;
and extracting effective data bytes after the judgment is passed, and analyzing to obtain configuration information of the ground equipment.
10. A ground communication control apparatus, characterized by comprising:
the detection unit is used for detecting a parking signal of a vehicle-mounted device;
the data reading unit is used for reading pre-stored binary byte data converted from local configuration information, wherein the local configuration information comprises a wifi name and a password;
the frequency modulation unit is used for starting frequency modulation when a full-bridge rectification circuit of the vehicle-mounted equipment is in a short-circuit state, transmitting the binary byte data to the vehicle-mounted equipment so that the vehicle-mounted equipment carries out frequency demodulation to obtain the binary byte data, and then carries out analysis to obtain the local configuration information and then establishes wireless connection;
and the first communication unit is used for stopping frequency modulation after receiving the confirmation signal of successful demodulation returned by the vehicle-mounted equipment in a wireless communication mode, and finishing communication connection.
11. The ground communication control device according to claim 10, wherein the frequency modulation unit includes a micro start module and a frequency control module, and specifically:
the micro-starting module is used for starting the charging system according to a preset micro-current;
the frequency control module is used for carrying out bit-by-bit transmission on data bits in each byte of the binary byte data through frequency modulation according to the one-to-one correspondence relationship between the starting frequency, the high level frequency and the low level frequency and the starting bit, 1 and 0 respectively, wherein one starting bit is transmitted before each data bit is transmitted.
12. The ground communication control device according to claim 10, wherein the ground communication control device further comprises a storage unit, specifically:
and the storage unit is used for storing binary byte data converted from the local configuration information.
13. An in-vehicle communication control apparatus characterized by comprising:
the circuit control unit is used for controlling the local full-bridge rectifying circuit to be in a short-circuit state;
the frequency sampling unit is used for carrying out frequency sampling on the local current/voltage in real time;
a conversion unit for converting the frequency sampling sequence into binary byte data by frequency demodulation according to the one-to-one correspondence of the start frequency, the high level frequency and the low level frequency with the start bit, 1 and 0, respectively;
the analysis unit is used for analyzing the binary byte data to obtain configuration information of the ground equipment, wherein the configuration information comprises a wifi name and a password;
and the second communication unit is used for establishing wireless connection with the ground equipment based on the configuration information and sending a confirmation signal of successful demodulation to the ground equipment in a wireless communication mode so as to stop the transmission of the frequency modulation information by the ground equipment.
14. A wireless charging communication system, comprising:
the ground communication control device according to any one of claims 10 to 12 and the vehicle communication control device according to any one of claims 13.
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