CN116633039A - Wireless communication control method in wireless power transmission system - Google Patents
Wireless communication control method in wireless power transmission system Download PDFInfo
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- CN116633039A CN116633039A CN202310624411.7A CN202310624411A CN116633039A CN 116633039 A CN116633039 A CN 116633039A CN 202310624411 A CN202310624411 A CN 202310624411A CN 116633039 A CN116633039 A CN 116633039A
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- 238000004891 communication Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 56
- 230000005540 biological transmission Effects 0.000 title claims abstract description 52
- 238000007600 charging Methods 0.000 claims abstract description 130
- 230000008878 coupling Effects 0.000 claims description 41
- 238000010168 coupling process Methods 0.000 claims description 41
- 238000005859 coupling reaction Methods 0.000 claims description 41
- 238000001514 detection method Methods 0.000 claims description 23
- 238000004519 manufacturing process Methods 0.000 claims description 18
- 238000005070 sampling Methods 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000010280 constant potential charging Methods 0.000 claims description 6
- 238000010277 constant-current charging Methods 0.000 claims description 6
- 230000010363 phase shift Effects 0.000 claims description 6
- 238000012790 confirmation Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00045—Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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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
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a wireless communication control method in a wireless power transmission system, and belongs to the technical field of wireless power transmission. The control method adopted by the invention is simple, the identification of the equipment and the confirmation of the charging position are realized by utilizing the wireless communication control method, no additional circuit is needed, no energy signal is needed to be intermittently transmitted by the transmitting end control circuit, the electromagnetic interference is reduced, and the reliability of the system is improved; by the method, the hopping of the communication frequency point is realized, and the mutual interference among a plurality of devices in the same place is reduced; the transmitting end control circuit obtains output voltage and output current through a wireless communication mode to complete double closed-loop control, constant voltage or constant current output is realized, the number of stages of the system is reduced, and the system efficiency is improved.
Description
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a wireless communication control method in a wireless power transmission system.
Background
The wireless power transmission technology is an emerging technology different from the traditional power transmission mode, and has the unique advantages of safety, convenience, reliability and the like, so that the wireless power transmission technology is rapidly developed by virtue of the convenience of application and is gradually applied to the fields of consumer electronics, medical electronics, electric automobiles and the like. In the field of electric automobiles, the wireless charging technology has a plurality of incomparable advantages compared with the traditional wired charging technology, so that the wireless charging technology has wider application prospect.
The magnetic coupling wireless power transmission technology is that a transmitting coil and a receiving coil adopt resonance compensation networks with the same frequency, so that medium-distance transmission is realized. The distance between the transmitting coil and the receiving coil, and the horizontal and longitudinal offsets can have great influence on the efficiency of wireless power transmission. If the relative position of the transmitting coil and the receiving coil is far away, the transmission efficiency of the system is greatly reduced, and the electric energy is converted into excessive heat energy, so that the equipment is overheated and damaged. Therefore, in order to ensure reliable and efficient operation of the wireless power transmission system, detection of the relative position of the receiving and transmitting coil of the wireless power transmission system is very important, and higher requirements are put on start-stop control of wireless power transmission.
At present, the transmitting end control circuit adopts a mode of intermittently transmitting an energy signal to detect whether the receiving end control circuit is in a charging area, and when the receiving end receives energy, the receiving end feeds back the energy signal to the transmitting end to be confirmed, and the mode leads to higher standby power consumption of the system, and if the receiving end is used in a high-voltage input occasion, strong magnetic interference phenomenon is caused. To this end, a wireless communication control method in a wireless power transmission system is proposed.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: how to solve the problems that the standby power consumption of the system is higher and the strong magnetic interference phenomenon is caused when the system is used in the occasion of inputting high voltage in the existing mode, and a wireless communication control method in a wireless electric energy transmission system is provided.
The invention solves the technical problems through the following technical scheme that the wireless electric energy transmission system comprises a transmitting end and a receiving end, electric energy transmission is realized between the transmitting end and the receiving end through a transmitting coil and a receiving coil, data transmission between a transmitting end control circuit and a receiving end control circuit is realized through respective wireless communication circuits, and the wireless communication control method comprises the following steps:
s1: after receiving the enabling charging signal, the receiving end control circuit sends out the charging parameter information of the receiving end control circuit through the wireless communication circuit of the receiving end, and the receiving end control circuit is in a receiving state after the sending is finished; the transmitting end control circuit compares the charging parameter information received by the wireless communication circuit of the transmitting end with the allowed working parameter data of the transmitting end to confirm whether the transmitting end is a receiving end matched with the transmitting end, if so, the transmitting end control circuit enters the next step, stores the received charging parameter information, and controls the charging of the output voltage and the output current according to the charging parameter information after normal charging;
s2: after receiving the normal charging data sent by the receiving end control circuit, the transmitting end control circuit feeds back the matching normal information to the receiving end control circuit, sets the frequency point of the wireless communication circuit of the transmitting end according to the received new frequency point data, and is in a receiving state under the new frequency point after the setting is finished; after receiving the matching normal information, the receiving end control circuit also sets the frequency point of the wireless communication circuit of the receiving end according to the same frequency point, and after the setting, the receiving end control circuit carries out data transmission state according to the new frequency point;
s3: the transmitting end control circuit outputs pulse magnetic field energy through the transmitting coil, the receiving end control circuit converts the received magnetic energy into electric energy through the receiving coil, and the coupling degree detection circuit detects the coupling degree of the transmitting coil and the receiving coil; when the coil coupling degree signal received by the receiving end control circuit is larger than the coupling degree signal set value, the receiving end control circuit sends a coupling degree detection passing code to the transmitting end control circuit, which indicates that the receiving end is in a normal charging area and can enter a normal charging process;
s4: the receiving end control circuit sends output voltage and current data of the receiving end in real time; after entering a normal charging process, the transmitting end control circuit performs double closed-loop control according to the output voltage and current data received in real time and stored charging parameter information, so as to realize the constant-voltage or constant-current charging process of the load battery
Further, in the step S1, the charging parameter information sent by the receiving end control circuit includes: charging voltage, charging current, stopping charging current, new frequency point data and check codes; the charging parameter information is set by the upper computer in a wireless communication mode.
Further, in the step S1, the receiving-end control circuit stores the set charging parameter information in the ferroelectric memory, and the receiving-end control circuit reads the charging parameter information from the ferroelectric memory for storing and transmitting each time of power-up.
Further, the parameter contents set by the upper computer include: the method comprises the steps of equipment production year, equipment production cycle, equipment coding, charging voltage, charging current, stopping charging current, voltage calibration coefficient, current calibration coefficient and check code.
Further, the new frequency point data is determined through the equipment production year, the equipment production cycle and the equipment code, specifically, the equipment production year is divided by 8 to obtain the remainder, the equipment production cycle is divided by 10 to obtain the remainder, the equipment code is divided by 20 to obtain the remainder, the three remainders are added and summed with 84 to obtain the new frequency point data, the range of the obtained data is 84 to 112, the MCU of the transmitting end control circuit/the receiving end control circuit receives the new frequency point data and writes the data into the communication chip in an SPI mode to realize frequency conversion, and the actual frequency range of the communication chip according to the received data conversion is 2.484GHz-2.512GHz.
Furthermore, in the step S1, when the receiving end control circuit sends the charging parameter information, the data transmission is performed by using the wireless communication frequency point unified by all the devices, and after the matching is confirmed, the data transmission is performed by using the new frequency point.
Further, in the step S2, the information sent by the receiving end control circuit in the normal charging phase, that is, the normal charging data, includes: the output voltage, the output current, the state code and the check code, wherein the output voltage occupies two bytes, the output current occupies two bytes, the state code occupies one byte, the check code occupies two bytes, and the check code is a CRC check code.
Further, in the step S3, the transmitting end control circuit in the normal charging stage determines the working state of the receiving end according to the received state code, specifically: when the transmitting end control circuit receives the coupling degree detection passing code, the transmitting end control circuit stops the pulse magnetic field energy output for the coupling degree detection and enters a normal charging stage; stopping charging after the transmitting end control circuit receives the fault code of the receiving end, and determining whether to restart the charging process according to the fault code; stopping charging after the transmitting end control circuit receives the receiving end stop code, and entering a standby state;
the receiving end shutdown state obtaining mode comprises the following steps: the receiving end control circuit has no charge enabling signal, and enters a dormant state after sending a shutdown code; after the output voltage acquired by the receiving end control circuit is charging voltage and charging current is smaller than charging stopping current, the receiving end control circuit prohibits the wireless communication circuit from working after sending the shutdown code, and the transmitting end control circuit immediately stops energy output and enters a standby state after receiving the shutdown code or not receiving new wireless communication data within 3.5 ms.
Further, in the step S3, the specific procedure is as follows:
s31: after the equipment is matched, the transmitting end control circuit outputs pulse magnetic field energy through the transmitting coil to confirm whether the receiving end coil is in a charging range or not;
s32: the receiving end control circuit collects the voltage signal output by the coupling degree detection circuit and compares the voltage signal with a coupling degree signal set value, when the sampling value is smaller than the set value, sampling comparison is carried out again, and if the coupling degree sampling value is continuously lower than the set value for 10 seconds, the receiving end coil is confirmed not to be in a charging range; if the coupling degree sampling value is detected to be larger than the set value within 10 seconds, the step S33 is entered;
s33: the receiving end control circuit sends a coupling degree detection passing code to the transmitting end control circuit through a state code bit of wireless communication, which indicates that the receiving end is in a normal charging area and can enter a normal charging process.
Further, in the step S4, after receiving the coupling degree detection passing code, the transmitting end control circuit starts normal charging control, and specifically includes the steps of:
s41: PI operation is carried out on output voltage data received in real time and stored charging voltage data, the maximum value of the PI operation is a charging current value, and the operation result is taken as a given value I of a current loop ref ；
S42: output current data received in real time and a given value I of a current loop ref PI operation is carried out, and the operation result is used as a phase shift control angle of the full-bridge phase shift circuit of the inverter, so that constant voltage or constant current charging is realized.
Compared with the prior art, the invention has the following advantages: the wireless communication control method in the wireless power transmission system is simple in control method, equipment identification and charging position confirmation are realized by using the wireless communication control method, an additional circuit is not needed, an energy signal is not needed to be intermittently transmitted by a transmitting end control circuit, electromagnetic interference is reduced, and the reliability of the system is improved; by the method, the hopping of the communication frequency point is realized, and the mutual interference among a plurality of devices in the same place is reduced; the transmitting end control circuit obtains output voltage and output current through a wireless communication mode to complete double closed-loop control, constant voltage or constant current output is realized, the number of stages of the system is reduced, and the system efficiency is improved.
Drawings
Fig. 1 is a schematic block diagram of a wireless power transfer system used in an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a transmitting end control method in an embodiment of the invention;
fig. 3 is a flow chart of a control method of a receiving end in an embodiment of the invention.
Detailed Description
The following describes in detail the examples of the present invention, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of protection of the present invention is not limited to the following examples.
The embodiment provides a technical scheme: a wireless communication control method in a wireless power transmission system, the wireless power transmission system used in the method comprises a transmitting end and a receiving end, as shown in figure 1; the transmitting end and the receiving end realize the transmission of electric energy through the transmitting coil and the receiving coil, and the data transmission between the transmitting end control circuit and the receiving end control circuit is realized through respective wireless communication circuits.
The transmitting end control circuit is in a standby state after being powered on, and the wireless communication circuit of the transmitting end is in a data receiving state; the receiving control circuit is in a dormant state through power supply of a load battery (a power battery pack), and when the receiving end control circuit receives the enabling charging signal, the receiving end control circuit performs a normal starting charging process, as shown in fig. 2 and 3. The specific method for starting charging (wireless communication control method) is as follows:
the first step: after receiving the enabling charging signal, the receiving end control circuit sends out information such as charging parameters of the receiving end control circuit through a wireless communication circuit of the receiving end, and the receiving end control circuit is in a receiving state after sending; the transmitting end control circuit compares the received data (information such as charging parameters) with the allowed working parameter data of the transmitting end through the wireless communication circuit of the transmitting end to confirm whether the receiving end is a receiving end matched with the transmitting end, if so, the transmitting end control circuit enters the next step, saves the received data information (information such as charging parameters) and controls the charging of the output voltage and the output current according to the information after normal charging;
and a second step of: after receiving the normal charging data sent by the receiving end control circuit, the transmitting end control circuit feeds back the matching normal information to the receiving end control circuit, sets the frequency point of the wireless communication circuit of the transmitting end according to the received new frequency point data, and is in a receiving state under the new frequency point after the setting is finished; after receiving the matching normal information, the receiving end control circuit also sets the frequency point of the wireless communication circuit of the receiving end according to the same frequency point, and after the setting, the receiving end control circuit carries out data transmission state according to the new frequency point;
and a third step of: the transmitting end control circuit outputs pulse magnetic field energy through the transmitting coil, the receiving end control circuit converts the received magnetic energy into electric energy through the receiving coil, and the coupling degree detection circuit detects the coupling degree of the transmitting coil and the receiving coil; when the coil coupling degree signal received by the receiving end control circuit is larger than the coupling degree signal set value, the receiving end control circuit sends a coupling degree detection passing code to the transmitting end control circuit, which indicates that the receiving end is in a normal charging area and can enter a normal charging process;
fourth step: the receiving end control circuit sends output voltage and current data of the receiving end in real time; and after entering a normal charging process, the transmitting end control circuit performs double closed-loop control according to the output voltage and current data received in real time and stored charging information (information such as charging parameters and the like) so as to realize the constant-voltage or constant-current charging process of the load battery.
In this embodiment, in the first step, the information such as the charging parameter sent by the receiving end control circuit includes: charging voltage, charging current, stopping charging current, new frequency point data and check codes; the information such as the charging parameters is set by the upper computer through a wireless communication mode, the receiving end control circuit stores the set information such as the charging parameters by adopting the ferroelectric memory, and the receiving end control circuit reads the information such as the charging parameters from the ferroelectric memory for storage and transmission when the receiving end control circuit is electrified every time.
In this embodiment, the parameter contents set by the upper computer include: the equipment production year, the equipment production cycle, the equipment code, the charging voltage, the charging current, the stopping charging current, the voltage calibration coefficient, the current calibration coefficient, the check code and the like; the new frequency point data is determined by equipment production year, equipment production cycle and equipment code, specifically, the equipment production year is divided by 8 to obtain remainder, the equipment production cycle is divided by 10 to obtain remainder, the equipment code is divided by 20 to obtain remainder, the three remainder are added and summed with 84 to obtain new frequency point data, the range of the obtained data is 84 to 112, and the MCU of the transmitting end control circuit/the receiving end control circuit writes the data into the communication chip in an SPI mode to realize frequency conversion, and the actual frequency range of the communication chip according to the received data conversion is 2.484GHz-2.512GHz.
In this embodiment, in the second step, the information sent by the receiving end control circuit in the normal charging phase, that is, the normal charging data, includes: output voltage, output current, status code, check code (CRC check code), wherein the output voltage takes two bytes, the output current takes two bytes, the status code takes one byte, and the CRC check code takes two bytes.
In the embodiment, in the first step, when the receiving end control circuit sends information such as charging parameters, the unified wireless communication frequency point of all the devices is used for data transmission, and after the matching is confirmed, the new frequency point is adopted for data transmission, so that simple frequency hopping control is realized, the interference between the devices when the devices work together can be reduced, and the stable operation of the wireless power transmission system is facilitated.
In this embodiment, in the third step, the transmitting-end control circuit in the normal charging stage determines the working state of the receiving end according to the received state code, including: the coupling degree detection state, the fault occurrence state, the shutdown state and the like are specifically as follows: when the transmitting end control circuit receives the coupling degree detection passing code, the transmitting end control circuit stops the pulse magnetic field energy output for the coupling degree detection and enters a normal charging stage; stopping charging after the transmitting end control circuit receives the fault code of the receiving end, and determining whether to restart the charging process according to the fault code; and stopping charging after the transmitting end control circuit receives the receiving end stop code, and entering a standby state.
In this embodiment, the receiving end shutdown state obtaining manner includes: firstly, the receiving end control circuit has no charge enabling signal, and enters a dormant state after sending a shutdown code; after the output voltage acquired by the receiving end control circuit is charging voltage and charging current is smaller than the charging current, the wireless communication circuit is forbidden to work after the receiving end control circuit sends a shutdown code; and the transmitting end control circuit immediately stops energy output and enters a standby state after receiving the shutdown code or not receiving new wireless communication data within 3.5 ms.
In this embodiment, the wireless communication mode is 2.4G wireless communication, the unified wireless communication frequency point of all devices is 2.483GHz, and the new frequency point range during frequency hopping operation is 2.484GHz-2.512GHz.
In this embodiment, the specific procedure of the third step is as follows:
1. after the equipment is matched, the transmitting end control circuit outputs pulse magnetic field energy through the transmitting coil to confirm whether the receiving end coil is in a charging range or not;
2. the receiving end control circuit collects the voltage signal output by the coupling degree detection circuit and compares the voltage signal with a coupling degree signal set value, when the sampling value is smaller than the set value, sampling comparison is carried out again, and if the coupling degree sampling value is continuously lower than the set value for 10 seconds, the receiving end coil is confirmed not to be in a charging range; if the coupling degree sampling value is detected to be larger than the set value within 10 seconds, entering the next step;
3. the receiving end control circuit sends a coupling degree detection passing code to the transmitting end control circuit through a state code bit of wireless communication, which indicates that the receiving end is in a normal charging area and can enter a normal charging process.
In the fourth step, in this embodiment, after receiving the coupling degree detection passing code, the transmitting end control circuit starts normal charging control, and specifically includes the steps of:
1. PI operation is carried out on output voltage data received in real time and stored charging voltage data (given value), the maximum value of the PI operation is a charging current value, and the operation result is taken as given value I of a current loop ref ；
2. Output current data received in real time and a given value I of a current loop ref PI operation is carried out, and the operation result is used as a phase shift control angle of the full-bridge phase shift circuit of the inverter, so that constant voltage or constant current charging is realized.
In summary, the wireless communication control method in the wireless power transmission system according to the above embodiment is simple, and uses the wireless communication control method to realize the identification of the device and the confirmation of the charging position, so that no additional circuit is required, no energy signal is required to be intermittently sent by the transmitting end control circuit, electromagnetic interference is reduced, and the reliability of the system is improved; by the method, the hopping of the communication frequency point is realized, and the mutual interference among a plurality of devices in the same place is reduced; the transmitting end control circuit obtains output voltage and output current through a wireless communication mode to complete double closed-loop control, constant voltage or constant current output is realized, the number of stages of the system is reduced, and the system efficiency is improved.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. The wireless communication control method in a wireless power transmission system, the wireless power transmission system includes a transmitting end and a receiving end, the transmitting end and the receiving end realize the transmission of power through a transmitting coil and a receiving coil, and the data transmission between a transmitting end control circuit and a receiving end control circuit is realized through respective wireless communication circuits, and the wireless communication control method is characterized by comprising the following steps:
s1: after receiving the enabling charging signal, the receiving end control circuit sends out the charging parameter information of the receiving end control circuit through the wireless communication circuit of the receiving end, and the receiving end control circuit is in a receiving state after the sending is finished; the transmitting end control circuit compares the charging parameter information received by the wireless communication circuit of the transmitting end with the allowed working parameter data of the transmitting end to confirm whether the transmitting end is a receiving end matched with the transmitting end, if so, the transmitting end control circuit enters the next step, stores the received charging parameter information, and controls the charging of the output voltage and the output current according to the charging parameter information after normal charging;
s2: after receiving the normal charging data sent by the receiving end control circuit, the transmitting end control circuit feeds back the matching normal information to the receiving end control circuit, sets the frequency point of the wireless communication circuit of the transmitting end according to the received new frequency point data, and is in a receiving state under the new frequency point after the setting is finished; after receiving the matching normal information, the receiving end control circuit also sets the frequency point of the wireless communication circuit of the receiving end according to the same frequency point, and after the setting, the receiving end control circuit carries out data transmission state according to the new frequency point;
s3: the transmitting end control circuit outputs pulse magnetic field energy through the transmitting coil, the receiving end control circuit converts the received magnetic energy into electric energy through the receiving coil, and the coupling degree detection circuit detects the coupling degree of the transmitting coil and the receiving coil; when the coil coupling degree signal received by the receiving end control circuit is larger than the coupling degree signal set value, the receiving end control circuit sends a coupling degree detection passing code to the transmitting end control circuit, which indicates that the receiving end is in a normal charging area and can enter a normal charging process;
s4: the receiving end control circuit sends output voltage and current data of the receiving end in real time; and after entering a normal charging process, the transmitting end control circuit performs double closed-loop control according to the output voltage and current data received in real time and stored charging parameter information, so as to realize the constant-voltage or constant-current charging process of the load battery.
2. The wireless communication control method in a wireless power transmission system according to claim 1, wherein: in the step S1, the charging parameter information sent by the receiving end control circuit includes: charging voltage, charging current, stopping charging current, new frequency point data and check codes; the charging parameter information is set by the upper computer in a wireless communication mode.
3. A radio communication control method in a radio energy transmission system according to claim 2, characterized in that: in the step S1, the receiving end control circuit stores the set charging parameter information by using the ferroelectric memory, and the receiving end control circuit reads the charging parameter information from the ferroelectric memory for storage and transmission when the receiving end control circuit is powered on each time.
4. A radio communication control method in a radio energy transmission system according to claim 2, characterized in that: the parameter content set by the upper computer comprises: the method comprises the steps of equipment production year, equipment production cycle, equipment coding, charging voltage, charging current, stopping charging current, voltage calibration coefficient, current calibration coefficient and check code.
5. A radio communication control method in a radio energy transmission system according to claim 2, characterized in that: the new frequency point data is determined through the equipment production year, the equipment production cycle and the equipment code, specifically, the equipment production year is divided by 8 to obtain the remainder, the equipment production cycle is divided by 10 to obtain the remainder, the equipment code is divided by 20 to obtain the remainder, the three remainders are added and summed with 84 to obtain the new frequency point data, the range of the obtained data is 84 to 112, and the MCU of the transmitting end control circuit/the receiving end control circuit writes the data into the communication chip in an SPI mode after receiving the new frequency point data to realize frequency conversion, and the actual frequency range of the communication chip according to the received data conversion is 2.484GHz-2.512GHz.
6. The wireless communication control method in a wireless power transmission system according to claim 5, wherein: in the step S1, when the receiving end control circuit sends the charging parameter information, the data transmission is performed by using wireless communication frequency points unified by all devices, and after the matching is confirmed, the data transmission is performed by using new frequency points.
7. The wireless communication control method in a wireless power transmission system according to claim 6, wherein: in the step S2, the information sent by the receiving end control circuit in the normal charging phase, that is, the normal charging data, includes: the output voltage, the output current, the state code and the check code, wherein the output voltage occupies two bytes, the output current occupies two bytes, the state code occupies one byte, the check code occupies two bytes, and the check code is a CRC check code.
8. The wireless communication control method in a wireless power transmission system according to claim 7, wherein: in the step S3, the transmitting end control circuit in the normal charging stage determines the working state of the receiving end according to the received state code, specifically: when the transmitting end control circuit receives the coupling degree detection passing code, the transmitting end control circuit stops the pulse magnetic field energy output for the coupling degree detection and enters a normal charging stage; stopping charging after the transmitting end control circuit receives the fault code of the receiving end, and determining whether to restart the charging process according to the fault code; stopping charging after the transmitting end control circuit receives the receiving end stop code, and entering a standby state;
the receiving end shutdown state obtaining mode comprises the following steps: the receiving end control circuit has no charge enabling signal, and enters a dormant state after sending a shutdown code; after the output voltage acquired by the receiving end control circuit is charging voltage and charging current is smaller than charging stopping current, the receiving end control circuit prohibits the wireless communication circuit from working after sending the shutdown code, and the transmitting end control circuit immediately stops energy output and enters a standby state after receiving the shutdown code or not receiving new wireless communication data within 3.5 ms.
9. The wireless communication control method in a wireless power transmission system according to claim 8, wherein: in the step S3, the specific process is as follows:
s31: after the equipment is matched, the transmitting end control circuit outputs pulse magnetic field energy through the transmitting coil to confirm whether the receiving end coil is in a charging range or not;
s32: the receiving end control circuit collects the voltage signal output by the coupling degree detection circuit and compares the voltage signal with a coupling degree signal set value, when the sampling value is smaller than the set value, sampling comparison is carried out again, and if the coupling degree sampling value is continuously lower than the set value for 10 seconds, the receiving end coil is confirmed not to be in a charging range; if the coupling degree sampling value is detected to be larger than the set value within 10 seconds, the step S33 is entered;
s33: the receiving end control circuit sends a coupling degree detection passing code to the transmitting end control circuit through a state code bit of wireless communication, which indicates that the receiving end is in a normal charging area and can enter a normal charging process.
10. The wireless communication control method in a wireless power transmission system according to claim 9, wherein: in the step S4, after receiving the coupling degree detection passing code, the transmitting end control circuit starts normal charging control, and specifically includes the steps of:
s41: PI operation is carried out on output voltage data received in real time and stored charging voltage data, the maximum value of the PI operation is a charging current value, and the operation result is taken as a given value I of a current loop ref ；
S42: output current data received in real time and a given value I of a current loop ref PI operation is carried out, and the operation result is used as a phase shift control angle of the full-bridge phase shift circuit of the inverter, so that constant voltage or constant current charging is realized.
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| CN117375190B (en) * | 2023-12-06 | 2024-05-03 | 深圳力高新能技术有限公司 | Parallel operation method and system of two-cluster battery system |
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