Dynamic wireless power supply precision metering and data synchronization fusion system for electric vehicles
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ELECTRIC POWER RES INST CHINA SOUTHERN POWER GRID CO LTD
- Filing Date
- 2023-09-28
- Publication Date
- 2026-07-10
Smart Images
Figure CN117284108B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of wireless power supply technology, and in particular to a dynamic wireless power supply precision metering and data synchronization fusion system for electric vehicles. Background Technology
[0002] With the emergence of severe energy crises and environmental problems, the development of electric vehicles has become a global consensus. However, the low energy density and large size and weight of electric vehicle batteries result in limited driving range. Traditional wired charging is slow and requires fixed charging stations, making it inconvenient. Therefore, dynamic wireless charging, which provides real-time power during vehicle movement, offers greater flexibility and convenience, improving driving range and effectively avoiding the aforementioned problems.
[0003] During operation, dynamic wireless power supply systems are subject to random movement and offset of the power receiver, uneven magnetic field distribution caused by road-laid coils, and random fluctuations in the system's coupling inductance. Due to the high-order nonlinear coupling of dynamic wireless power supply systems, the fluctuations in mutual inductance at the receiver under different motion conditions will cause time-varying fluctuations in the input and output port power, making it difficult to stabilize the port power and posing a serious challenge to the metering and monitoring system of dynamic wireless power supply systems. Summary of the Invention
[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to provide a precise metering and data synchronization fusion system for dynamic wireless power supply of electric vehicles, so as to achieve safe, real-time, and reliable metering and monitoring of the electrical parameters of the core ports of the dynamic wireless power supply system.
[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:
[0006] A dynamic wireless power supply precision metering and data synchronization fusion system for electric vehicles includes:
[0007] A dynamic wireless power supply unit includes a DC power supply, a high-frequency inverter circuit, a primary-side resonant unit, a transmitting coil, a receiving coil, a secondary-side resonant unit, a rectifier circuit, and a power supply load. The DC power output from the DC power supply is converted into high-frequency AC power by the high-frequency inverter circuit, and then transmitted to the receiving coil after resonance by the resonant circuit composed of the primary-side resonant unit and the transmitting coil. The receiving coil sequentially transmits the received high-frequency AC power to the secondary-side resonant unit and the rectifier circuit, and outputs the rectified DC power to the power supply load to provide energy to the load.
[0008] The lower-level precision metering unit is used to collect the voltage and current signals of the DC power supply terminal and the power supply load terminal, as well as the voltage and current signals of the high-frequency inverter circuit output terminal, and send them to the upper-level data processing unit. The voltage and current signals of the DC power supply terminal, the power supply load terminal, and the high-frequency inverter circuit output terminal are the electrical signal data of the system input terminal, output terminal, and intermediate terminal, respectively.
[0009] The host computer data processing unit is used to receive the electrical signals sent by the lower computer precision metering unit and perform data synchronization and fusion processing.
[0010] Preferably, the lower-level precise measurement unit includes:
[0011] The current conversion circuit is used to convert the high-frequency high-current signal from the output of the high-frequency inverter circuit into a high-frequency voltage signal with a first preset range when acquiring the high-frequency high-current signal.
[0012] A voltage divider circuit is used to divide the high-frequency voltage signal and convert it into a voltage signal with a second preset range.
[0013] The acquisition circuit is used to convert the voltage signal, which has been converted to a second preset range, into a corresponding digital signal and send it to the microcontroller, so that the microcontroller can send it to the host computer data processing unit through the wireless communication module.
[0014] Preferably, the microcontroller is also used to add a synchronization flag to the digital signal and send the digital signal with the added synchronization flag to the host computer data processing unit so that the host computer data processing unit can perform data synchronization and fusion processing according to the synchronization flag.
[0015] Preferably, when the host computer data processing unit performs data synchronization and fusion processing based on the synchronization flag, it is specifically used to fuse the electrical signal data of the system input terminal, output terminal and intermediate terminal belonging to the same synchronization flag into the same chart for data measurement.
[0016] Preferably, the lower-level precise metering unit further includes a high-frequency port power phase measurement circuit, used to collect the voltage and current signals at the output of the high-frequency inverter circuit and calculate the phase angle to achieve active power metering.
[0017] Preferably, the high-frequency port charge phase measurement circuit includes a first to a ninth resistor, a first operational amplifier and a second operational amplifier, two comparators, a logic gate circuit, and a capacitor; wherein, the voltage signal at the output of the high-frequency inverter circuit is connected to the inverting input and non-inverting input of the first operational amplifier through the first resistor and the third resistor, respectively; the inverting input of the first operational amplifier is also connected to the output of the first operational amplifier and the first end of the fifth resistor through the second resistor; the second end of the fifth resistor is connected to the positive terminal of a comparator; the negative terminal of the comparator is grounded; the non-inverting input of the first operational amplifier is also grounded through the fourth resistor; the comparator... The output terminal is connected to the first input terminal of the logic gate circuit; the current signal at the output terminal of the high-frequency inverter circuit is connected to the inverting input terminal and the non-inverting input terminal of the second operational amplifier, respectively. The inverting input terminal of the second operational amplifier is grounded through the sixth resistor, and is connected to the output terminal of the second operational amplifier and the first terminal of the eighth resistor through the seventh resistor, respectively. The second terminal of the eighth resistor is connected to the positive terminal of another comparator, the negative terminal of the other comparator is grounded, the output terminal of the other comparator is connected to the second input terminal of the logic gate circuit, and the output terminal of the logic gate circuit is grounded through the ninth resistor and the capacitor, wherein the ninth resistor and the capacitor constitute a differentiating circuit.
[0018] Preferably, the host computer data processing unit includes a filtering unit for filtering the electrical signals sent by the lower computer precision metering unit.
[0019] Preferably, the filtering unit, when performing filtering processing, is specifically used for:
[0020] Acquire all discrete electrical signal data, group all discrete electrical signal data into arrays, select initial values from all arrays, set the window half-width to M, and set the filtering order to N;
[0021] Centered on the initial value, select data with a window width of 2M+1, and perform least squares error Nth-order polynomial fitting. After the Nth-order polynomial fitting is completed, output the fitted data to obtain the filtered data.
[0022] This invention has at least the following technical effects:
[0023] This invention uses a lower-level precision metering unit to collect voltage and current signals from the DC power supply terminal and the power supply load terminal, as well as voltage and current signals from the output terminal of the high-frequency inverter circuit. When collecting the high-frequency, high-current signal from the high-frequency inverter circuit output terminal, a current conversion circuit and a voltage divider circuit are used for signal conversion to facilitate signal acquisition. Additionally, the lower-level precision metering unit also collects the phase angle of the high-frequency electrical signal through a high-frequency port power phase measurement circuit to achieve active power metering. Furthermore, after acquiring the signals, the lower-level precision metering unit adds a synchronization flag to the acquired signals and sends them to the upper-level data processing unit so that the upper-level data... After receiving and filtering the collected signals, the processing unit performs data synchronization fusion processing based on the synchronization flag to achieve data metering. This enables safe, real-time, and reliable metering and monitoring of the electrical parameters at the core port of the dynamic wireless power supply system. It allows for stable perception of the power consumption status during dynamic wireless power supply and promotes the establishment of power metering standards and monitoring specifications for dynamic wireless power supply. Especially in the field of electric vehicles, it provides accurate economic settlement basis for users and power supply companies, thereby promoting the large-scale application of dynamic wireless power supply in the new energy electric vehicle market. It has important scientific research value and practical engineering significance for promoting the development of the electric vehicle industry and dynamic wireless power supply technology.
[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0025] Figure 1 This is a structural block diagram of the electric vehicle dynamic wireless power supply precision metering and data synchronization fusion system according to an embodiment of the present invention.
[0026] Figure 2 This is a structural block diagram of the dynamic wireless power supply unit according to an embodiment of the present invention.
[0027] Figure 3 This is a schematic diagram of the high-frequency port charge phase measurement circuit according to an embodiment of the present invention.
[0028] Figure 4 This is a schematic diagram illustrating the working principle of the filtering unit in an embodiment of the present invention. Detailed Implementation
[0029] The following describes this embodiment in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.
[0030] The following description, with reference to the accompanying drawings, illustrates a dynamic wireless power supply precision metering and data synchronization fusion system for electric vehicles according to this embodiment.
[0031] Figure 1 This is a structural block diagram of the electric vehicle dynamic wireless power supply precision metering and data synchronization fusion system according to an embodiment of the present invention. Figure 1 As shown, the electric vehicle dynamic wireless power supply precision metering and data synchronization fusion system includes a dynamic wireless power supply unit, a lower-level precision metering unit, and an upper-level data processing unit connected in sequence. Figure 2 As shown, the dynamic wireless power supply unit includes a DC power supply, a high-frequency inverter circuit, a primary-side resonant unit, a transmitting coil, a receiving coil, a secondary-side resonant unit, a rectifier circuit, a power supply load, as well as a control circuit and a drive circuit.
[0032] The system comprises the following components: a DC power supply, which provides DC power to the high-frequency inverter circuit to power subsequent modules; a control circuit, which generates PWM (Pulse Width Modulation) control signals; a drive circuit, which amplifies the PWM signals and drives the high-frequency inverter circuit; a high-frequency inverter circuit, which converts DC power into high-frequency AC power controlled by the PWM signal; a primary-side resonant unit, which forms a resonant circuit with the transmitting coil; a transmitting coil, which transmits energy to the receiving coil; a receiving coil, which receives the energy transmitted by the transmitting coil and generates high-frequency AC power with the same frequency as the current in the transmitting coil; a secondary-side resonant unit, which forms a resonant circuit with the receiving coil; a rectifier circuit, which rectifies the high-frequency AC power in the receiving coil into DC power and uses a parallel large capacitor to ensure that the charging voltage ripple fluctuation is less than a certain value, thus achieving voltage regulation; and a power supply load, which stores energy to power the electric vehicle and various loads on board.
[0033] In this embodiment, the DC power output from the DC power supply is converted into high-frequency AC power through a high-frequency inverter circuit, and then transmitted to the receiving coil after resonance by the resonant circuit composed of the primary resonant unit and the transmitting coil. The receiving coil transmits the received high-frequency AC power sequentially to the secondary resonant unit and the rectifier circuit, and outputs the rectified DC power to the power supply load to provide energy for the power supply load.
[0034] Furthermore, the lower-level precision metering unit is used to collect voltage and current signals from the DC power supply terminal and the power supply load terminal, as well as the voltage and current signals from the output terminal of the high-frequency inverter circuit, and send them to the upper-level data processing unit. The voltage and current signals from the DC power supply terminal, the power supply load terminal, and the high-frequency inverter circuit output terminal are the electrical signal data from the system input terminal, output terminal, and intermediate terminal, respectively. Then, the upper-level data processing unit receives the electrical signals sent by the lower-level precision metering unit and performs data synchronization and fusion processing.
[0035] Specifically, the dynamic wireless power supply unit consists of three parts: an input terminal, an output terminal, and an intermediate terminal. The lower-level precision metering unit needs to collect and measure the voltage and current at the input terminal and the load side (output terminal). Since the high-frequency inverter output state affects the performance of the entire dynamic wireless power supply unit, corresponding circuits need to be designed to collect high-frequency voltage and current. Based on the application scenario of the dynamic wireless power supply unit and common wireless communication methods on the market, wireless communication is typically chosen to transmit the collected signals to the upper-level terminal, where the received multi-channel, multi-dimensional electrical parameter signals are synchronously fused.
[0036] For high-frequency, high-voltage, and high-current signals, the lower-level precision metering unit includes a current conversion circuit, a voltage divider circuit, and a data acquisition circuit. When acquiring the high-frequency, high-current signal from the output of the high-frequency inverter circuit, the current conversion circuit converts the high-frequency, high-current signal into a high-frequency voltage signal with a first preset range. This signal is then sent to the voltage divider circuit, which divides the high-frequency voltage signal and converts it into a voltage signal with a second preset range. The data acquisition circuit then acquires this signal and converts it into a corresponding digital signal, which is sent to the microcontroller. The microcontroller then transmits the signal to the upper-level data processing unit via a wireless communication module, such as a Wi-Fi (Wireless Fidelity) module. Essentially, when acquiring the high-frequency, high-voltage signal from the output of the high-frequency inverter circuit, the signal can be converted using a voltage divider circuit, then converted into a corresponding digital signal by the data acquisition circuit, and finally transmitted by the microcontroller to the upper-level data processing unit via a wireless communication module.
[0037] In this embodiment, a voltage divider circuit and a current conversion circuit are designed for the high voltage and high current quantities in the dynamic wireless power supply unit to convert the measured quantities accordingly, thereby facilitating the acquisition of multi-dimensional electrical parameters suitable for processing by the acquisition system.
[0038] It should be noted that the resistors in the voltage divider circuit and current conversion circuit are ceramic-insulated power wire-wound resistors. These components possess excellent characteristics such as high resistance, rapid heat dissipation, high strength, moisture resistance, heat resistance, and explosion-proof properties, making them suitable for environments with high current and high voltage. In this embodiment, through specialized component selection and circuit design, excellent economic efficiency can be achieved while meeting measurement requirements.
[0039] Furthermore, the microcontroller is also used to add synchronization flags to digital signals and send the digital signals with added synchronization flags to the host computer data processing unit so that the host computer data processing unit can perform data synchronization and fusion processing according to the synchronization flags.
[0040] Specifically, when the host computer data processing unit performs data synchronization fusion processing based on the synchronization flag, it merges the electrical signal data of the system input, output and intermediate terminals belonging to the same synchronization flag into the same chart for data measurement.
[0041] Specifically, when the microcontroller acquires DC signals from the input or output terminals and converts them into corresponding digital signals, or when it acquires high-frequency electrical signals from intermediate terminals and converts them into corresponding digital signals, it adds a synchronization flag to the digital signals. This synchronization flag is used to determine the output electrical signal and intermediate electrical signal corresponding to the input electrical signal. The electrical signals from the three terminals are then plotted on a graph based on the synchronization flag. This allows the input, output, and intermediate electrical signals corresponding to the synchronization flag to be identified on the graph, thus facilitating data measurement.
[0042] In one embodiment of the present invention, the lower-level precise metering unit further includes a high-frequency port power phase measurement circuit, which is used to collect the voltage signal and current signal at the output of the high-frequency inverter circuit and calculate the phase angle so as to realize the measurement of active power.
[0043] like Figure 3 As shown, the high-frequency port charge phase measurement circuit includes resistors R1 to R9, a first operational amplifier OPA1 and a second operational amplifier OPA2, two comparators CMP, a logic gate circuit Logic, and a capacitor C; wherein, the voltage signal U at the output of the high-frequency inverter circuit is... s The inverting and non-inverting inputs of the first operational amplifier OPA1 are connected via resistors R1 and R3, respectively. The inverting input of OPA1 is also connected via resistor R2 to the output of OPA1 and the first terminal of resistor R5. The second terminal of resistor R5 is connected to the positive terminal of comparator CMP, and the negative terminal of comparator CMP is grounded. The non-inverting input of OPA1 is also grounded via resistor R4. The output of comparator CMP is connected to the first input of logic gate circuit Logic. The current signal I1 at the output of the high-frequency inverter circuit is connected to... The inverting and non-inverting inputs of the second operational amplifier OPA2 are connected. The inverting input of the second operational amplifier OPA2 is grounded through the sixth resistor R6, and is connected to the output of the second operational amplifier OPA2 and the first end of the eighth resistor R8 through the seventh resistor R7. The second end of the eighth resistor R8 is connected to the positive end of another comparator CMP, and the negative end of the other comparator CMP is grounded. The output of the other comparator CMP is connected to the second input of the logic gate circuit Logic. The output of the logic gate circuit Logic is grounded through the ninth resistor R9 and the capacitor C. The ninth resistor R9 and the capacitor C constitute a differentiating circuit.
[0044] Specifically, the output voltage U of the high-frequency power port can be obtained through a Hall sensor. s And output current I1, output voltage U sThe output current I1 is adjusted to a suitable amplitude, i.e., U, by operational amplifiers OPA1 and OPA2. s_opa and I 1_opa Then, by adding a comparator circuit (CMP), DC square wave voltage signals with the same amplitude and zero-crossing point are obtained. These two DC square wave voltage signals are input into the logic gate circuit (Logic), causing Logic to generate another square wave signal with an amplitude of V. XOR Its pulse width is equal to the output voltage U. s The phase angle delay between the output current I1 and the output current is calculated, and then an RC differentiating circuit, namely the differentiating circuit consisting of the ninth resistor R9 and capacitor C, is placed at the output of the logic gate circuit Logic, so that V can be converted through this differentiating circuit. XOR Converted to an average voltage V proportional to the phase angle phase Finally, V can be measured. phase To calculate the output phase angle.
[0045] Furthermore, for the acquisition and measurement of multi-dimensional electrical parameters of the dynamic wireless power supply unit, due to the high-frequency turn-on and turn-off noise of the switching transistor, packet loss fluctuations caused by wireless communication, and ambient noise, the acquired voltage and current signals will always have high-frequency random noise fluctuations. Therefore, it is necessary to filter the acquired data.
[0046] In one embodiment of the present invention, the host computer data processing unit includes a filtering unit for filtering the electrical signals sent by the lower computer precision metering unit.
[0047] like Figure 4 As shown, the filtering unit specifically acquires all discrete electrical signal data during filtering, groups all discrete electrical signal data into arrays, selects an initial value x[i] from all arrays, sets the window half-width to M, and sets the filtering order to N, where i represents the i-th group of data. Then, with the initial value x[i] as the center, it selects data with a window width of 2M+1, and performs least squares error N-order polynomial fitting on the selected window data. After confirming that the N-order polynomial fitting is completed, it outputs the fitted data, i.e., y[i], thus obtaining the filtered data.
[0048] Furthermore, a lower-level precision metering system was designed for data acquisition and metering by the lower-level precision metering unit. The entire processing flow of the lower-level precision metering system mainly consists of a main program and two subroutines: a data acquisition and reception program. The main program uses a polling system to continuously execute tasks such as system initialization, acquisition of voltage and current data, and serial port reception processing. The voltage and current acquisition program sets up the ADC (analog-to-digital converter) chip and obtains data. First, it sets one single input channel of the ADC chip to trigger ADC conversion. If successful, it calculates the converted value to obtain the sampled voltage value. Then, it sets another single input channel to trigger ADC conversion. If successful, it calculates the converted value to obtain the sampled current value. Finally, the sampling subroutine ends. After the sampling program, if the frame header and function code are correct, the serial port processing program sends the sampled data and ends the task.
[0049] Furthermore, a host computer data processing system was designed to handle the processing and display of acquired data by the host computer data processing unit. The host computer data processing system adopts a basic state machine pattern to realize data processing and visualization. The state machine consists of loops, conditional structures, and shift registers. In the main program, the loop structure ensures stable operation, the conditional structure supports state selection, and the shift register passes the selection from the conditional structure to the loop structure to complete the next iteration. The state machine loop includes an event structure to determine the next state based on actual conditions. Upon transitioning to the correct state, the corresponding function is executed. To add interactive functionality, an event structure, i.e., a wait event in the host computer state diagram, needs to be added to the main program. When the user operates on the host computer interface, the operation state is captured and passed to the corresponding branch. The next operation state of the state machine is determined based on the current state. When the correct loop state is reached, the corresponding branch function is executed, thereby realizing event-based functions such as data processing and visualization.
[0050] In summary, this invention uses a lower-level precision metering unit to collect voltage and current signals from the DC power supply and load terminals, as well as voltage and current signals from the output of the high-frequency inverter circuit. When collecting the high-frequency, high-current signal from the high-frequency inverter circuit output, a current conversion circuit and a voltage divider circuit are used for signal conversion to facilitate signal acquisition. Furthermore, the lower-level precision metering unit also collects the phase angle of the high-frequency electrical signal through a high-frequency port power phase measurement circuit to achieve active power metering. After acquiring the signals, the lower-level precision metering unit adds a synchronization flag to the acquired signals and sends them to the upper-level data processing unit for synchronization. The machine data processing unit receives the collected signals and filters them. Then, it performs data synchronization fusion processing according to the synchronization flag to achieve data metering. This enables safe, real-time, and reliable metering and monitoring of the electrical parameters of the core port of the dynamic wireless power supply system. It allows for stable perception of the power consumption status during dynamic wireless power supply and promotes the establishment of power metering standards and monitoring specifications for dynamic wireless power supply. Especially in the field of electric vehicles, it provides accurate economic settlement basis for users and power supply companies, thereby promoting the large-scale application of dynamic wireless power supply in the market of new energy electric vehicles. It has important scientific research value and practical engineering significance for promoting the development of the electric vehicle industry and dynamic wireless power supply technology.
[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0052] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.
Claims
1. A dynamic wireless power supply precision metering and data synchronization fusion system for electric vehicles, characterized in that, include: A dynamic wireless power supply unit includes a DC power supply, a high-frequency inverter circuit, a primary-side resonant unit, a transmitting coil, a receiving coil, a secondary-side resonant unit, a rectifier circuit, and a power supply load. The DC power output from the DC power supply is converted into high-frequency AC power by the high-frequency inverter circuit, and then transmitted to the receiving coil after resonance by the resonant circuit composed of the primary-side resonant unit and the transmitting coil. The receiving coil sequentially transmits the received high-frequency AC power to the secondary-side resonant unit and the rectifier circuit, and outputs the rectified DC power to the power supply load to provide energy to the load. The lower-level precision metering unit is used to collect the voltage and current signals of the DC power supply terminal and the power supply load terminal, as well as the voltage and current signals of the high-frequency inverter circuit output terminal, and send them to the upper-level data processing unit. The voltage and current signals of the DC power supply terminal, the power supply load terminal, and the high-frequency inverter circuit output terminal are the electrical signal data of the system input terminal, output terminal, and intermediate terminal, respectively. The host computer data processing unit is used to receive the electrical signals sent by the lower computer precision metering unit and perform data synchronization and fusion processing. The lower-level precise measurement unit includes: The current conversion circuit is used to convert the high-frequency high-current signal from the output of the high-frequency inverter circuit into a high-frequency voltage signal with a first preset range when acquiring the high-frequency high-current signal. A voltage divider circuit is used to divide the high-frequency voltage signal and convert it into a voltage signal with a second preset range. The acquisition circuit is used to convert the voltage signal, which has been converted to a second preset range, into a corresponding digital signal and send it to the microcontroller, so that the microcontroller can send it to the host computer data processing unit through the wireless communication module. The high-frequency port power phase measurement circuit is used to collect the voltage and current signals at the output of the high-frequency inverter circuit and calculate the phase angle in order to realize the measurement of active power. The high-frequency port charge phase measurement circuit includes a first resistor to a ninth resistor, a first operational amplifier and a second operational amplifier, two comparators, a logic gate circuit and a capacitor. The voltage signal at the output of the high-frequency inverter circuit is connected to the inverting and non-inverting inputs of the first operational amplifier through a first resistor and a third resistor, respectively. The inverting input of the first operational amplifier is also connected to the output of the first operational amplifier and the first end of a fifth resistor through a second resistor. The second end of the fifth resistor is connected to the positive terminal of a comparator, and the negative terminal of the comparator is grounded. The non-inverting input of the first operational amplifier is also grounded through a fourth resistor. The output of the comparator is connected to the first input of the logic gate circuit. The current signal at the output of the high-frequency inverter circuit is connected to the inverting and non-inverting inputs of the second operational amplifier, respectively. The inverting input of the second operational amplifier is grounded through a sixth resistor and connected to the output of the second operational amplifier and the first end of an eighth resistor through a seventh resistor. The second end of the eighth resistor is connected to the positive terminal of another comparator, and the negative terminal of the other comparator is grounded. The output of the other comparator is connected to the second input of the logic gate circuit. The output of the logic gate circuit is grounded through a ninth resistor and a capacitor, wherein the ninth resistor and the capacitor constitute a differentiating circuit.
2. The electric vehicle dynamic wireless power supply precision metering and data synchronization fusion system as described in claim 1, characterized in that, The microcontroller is also used to add a synchronization flag to the digital signal and send the digital signal with the added synchronization flag to the host computer data processing unit so that the host computer data processing unit can perform data synchronization and fusion processing according to the synchronization flag.
3. The electric vehicle dynamic wireless power supply precision metering and data synchronization fusion system as described in claim 2, characterized in that, When the host computer data processing unit performs data synchronization and fusion processing based on the synchronization flag, it specifically merges the electrical signal data of the system input, output and intermediate terminals belonging to the same synchronization flag into the same chart for data measurement.
4. The electric vehicle dynamic wireless power supply precision metering and data synchronization fusion system as described in claim 1, characterized in that, The host computer data processing unit includes a filtering unit, which is used to filter the electrical signals sent by the lower computer precision metering unit.
5. The electric vehicle dynamic wireless power supply precision metering and data synchronization fusion system as described in claim 4, characterized in that, When performing filtering, the filtering unit is specifically used for: Acquire all discrete electrical signal data, group all discrete electrical signal data into arrays, select initial values from all arrays, set the window half-width to M, and set the filtering order to N; Centered on the initial value, select data with a window width of 2M+1, and perform least squares error Nth-order polynomial fitting. After the Nth-order polynomial fitting is completed, output the fitted data to obtain the filtered data.