Voltage fast compensation method, voltage compensation device and charging pile

Abstract

The application discloses a voltage fast compensation method, a voltage compensation device and a charging pile, and is applied to the charging pile, wherein the charging pile comprises a charging end and a charging device; the charging device is used for outputting corresponding electric energy to the charging end according to the charging request of the to-be-charged equipment when the to-be-charged equipment is connected to the charging end, so as to charge the to-be-charged equipment; the voltage fast compensation method comprises the following steps: acquiring the charging request of the to-be-charged equipment and detecting the electric energy output to the charging end by the charging device, so as to generate an electric energy compensation strategy according to the charging request of the to-be-charged equipment and the electric energy of the charging end; and after a corresponding compensation voltage is generated according to the electric energy compensation strategy, the compensation voltage is coupled to the charging end. According to the application, the charging request and the electric energy of the charging end are detected in real time, the compensation voltage is immediately output when the two are unbalanced, the output voltage of the charging end is ensured to always meet the request voltage of the to-be-charged equipment, and the response speed and stability of the charging pile are improved.

Description

Voltage rapid compensation method, voltage compensation device and charging pile Technical Field

[0001] This invention relates to charging piles, and more specifically to a method for rapid voltage compensation, a voltage compensation device, and a charging pile. Background Technology

[0002] Traditional DC charging piles operate in a voltage loop. First, the vehicle's battery management system sends a voltage request to the charging pile. Then, the corresponding sub-control board of the charging pile sends the received request voltage value to the main control board, which in turn sends it to the power unit. Finally, the power unit outputs the corresponding request voltage. This multi-level communication relay inevitably reduces the charging pile's output response speed. It also prevents timely responses to charging pile malfunctions, leading to a discrepancy between the charging pile's output voltage and the requested voltage of the device being charged, thus affecting the normal operation of the charging pile. Summary of the Invention

[0003] The main objective of this invention is to provide a method for rapid voltage compensation, a voltage compensation device, and a charging pile, which aims to improve the response speed and stability of the charging pile.

[0004] To achieve the above objectives, this invention proposes a rapid voltage compensation method applied to a charging pile. The charging pile includes a charging terminal and a charging device. When a device to be charged is connected to the charging terminal, the charging device outputs corresponding electrical energy to the charging terminal according to the charging request of the device to be charged, so as to charge the device. The rapid voltage compensation method includes:

[0005] Obtain the charging parameters of the charging terminal, and generate an energy compensation strategy based on the charging parameters of the charging terminal;

[0006] The corresponding compensation voltage is generated according to the power compensation strategy and then coupled to the charging terminal.

[0007] In one embodiment, obtaining the charging parameters of the charging terminal to generate an energy compensation strategy based on the charging parameters specifically includes:

[0008] The system acquires the charging request of the device to be charged and / or detects the electrical energy output from the charging device to the charging terminal, so as to generate an electrical energy compensation strategy based on the charging request of the device to be charged and / or the electrical energy of the charging terminal.

[0009] In one embodiment, the step of acquiring the charging request of the device to be charged and / or detecting the electrical energy output by the charging device to the charging terminal, so as to generate an energy compensation strategy based on the charging request of the device to be charged and / or the electrical energy of the charging terminal, specifically includes:

[0010] Obtain the requested voltage from the charging request of the device to be charged and detect the current voltage of the charging terminal;

[0011] The current voltage is subtracted from the requested voltage to obtain a voltage difference value, and an energy compensation strategy is generated based on the voltage difference value.

[0012] In one embodiment, the step of acquiring the charging request of the device to be charged and / or detecting the electrical energy output by the charging device to the charging terminal, so as to generate an energy compensation strategy based on the charging request of the device to be charged and / or the electrical energy of the charging terminal, specifically includes:

[0013] The voltage at the output terminal of the charging device is sampled at a preset sampling period, and the voltage at the output terminal of the charging device is obtained in two adjacent periods.

[0014] The actual voltage change rate is obtained based on the voltage at the output terminal of the charging device within two adjacent cycles;

[0015] A power compensation strategy is generated based on the voltage at the output of the charging device and the actual voltage change rate in two adjacent cycles.

[0016] In one embodiment, obtaining the actual voltage change rate based on the voltage at the output terminal of the charging device within two adjacent cycles includes:

[0017] The difference between the voltage of the previous sampling period and the voltage of the current sampling period is obtained to obtain the sampling voltage difference value.

[0018] The actual voltage change rate is obtained by calculating the quotient of the sampled voltage difference and the voltage of the previous sampling period.

[0019] In one embodiment, the power compensation strategy includes:

[0020] When the actual voltage change rate is outside the preset voltage change rate range, a compensation voltage is generated based on the voltage of the previous sampling period and the voltage of the current sampling period.

[0021] In one embodiment, generating the compensation voltage based on the voltage of the previous sampling period and the voltage of the current sampling period specifically includes:

[0022] The difference between the voltage of the previous sampling period and the voltage of the current sampling period is obtained to obtain the sampling voltage difference value.

[0023] Calculate the product of the sampled voltage difference and the predicted compensation coefficient to obtain the predicted compensation voltage value;

[0024] The predicted compensation voltage value is inverted to obtain the compensation voltage.

[0025] In one embodiment, the fast voltage compensation method further includes:

[0026] Detect the voltage output from the charging device to the charging terminal;

[0027] Extract the voltage amplitude of the voltage output by the charging device to the charging terminal at each frequency within a preset frequency range;

[0028] The compensation voltage corresponding to each frequency is generated based on the voltage amplitude of each frequency and the preset voltage amplitude.

[0029] The compensation voltage is coupled to the output terminal.

[0030] In one embodiment, generating the compensation voltage corresponding to each frequency based on the voltage amplitude of each frequency and a preset voltage amplitude specifically involves:

[0031] The voltage amplitude at each frequency is subtracted from the preset voltage amplitude to obtain the corresponding voltage difference value for each frequency.

[0032] The voltage difference between each frequency is used as a compensation voltage and coupled to the charging terminal.

[0033] In one embodiment, the fast voltage compensation method further includes:

[0034] When the current voltage at the output terminal of the charging device reaches the requested voltage, the output of the compensation voltage is stopped.

[0035] The present invention also proposes a voltage compensation device for use in a charging pile. The charging pile includes a charging terminal and a charging device. When a device to be charged is connected to the charging terminal, the charging device outputs corresponding electrical energy to the charging terminal according to the charging request of the device to be charged, so as to supply power to the device to be charged. The voltage compensation device includes an electrical energy generation circuit, a memory, and a processor.

[0036] The charging terminal includes a power output interface and a communication interface; the communication interface of the charging terminal is connected to the charging device via a first communication bus.

[0037] The power generation circuit has an input terminal, an output terminal, and a controlled terminal. The input terminal of the power generation circuit is used to connect to a power source. The output terminal of the power generation circuit is connected to the power output interface of the charging terminal. The controlled terminal of the power generation circuit is connected to the processor. The power generation circuit is used to output a compensation voltage under the control of the processor.

[0038] The processor and the charging terminal are connected via a second communication bus to obtain the charging request from the device to be charged.

[0039] The memory is electrically connected to the processor, and the memory stores a voltage fast compensation method program. When the voltage fast compensation method program is executed by the processor, it implements the voltage fast compensation method described above.

[0040] In one embodiment, the voltage compensation device further includes a voltage detection circuit and an isolation transformer;

[0041] The input terminal of the voltage detection circuit is used to detect the voltage output by the charging device to the power output interface of the charging terminal, and the output terminal of the voltage detection circuit is connected to the processor.

[0042] The input terminal of the isolation transformer is connected to the output terminal of the power generation circuit, and the output terminal of the isolation transformer is connected to the power output interface of the charging terminal. The isolation transformer is used to couple the compensation voltage to the power output interface of the charging terminal.

[0043] The present invention also proposes a charging pile, which includes a charging terminal, a charging device, and the voltage compensation device described above.

[0044] The charging device is connected to the charging terminal. When the charging terminal is connected to the device to be charged, the charging device is used to output corresponding electrical energy to the charging terminal according to the charging request of the device to be charged, so as to charge the device to be charged.

[0045] The voltage compensation device is connected to the charging terminal. The voltage compensation device is used to acquire the charging request of the device to be charged and detect the electrical energy output by the charging device to the charging terminal, so as to generate an electrical energy compensation strategy according to the charging request of the device to be charged and the electrical energy of the charging terminal; and generate a corresponding compensation voltage according to the electrical energy compensation strategy and couple it to the charging terminal.

[0046] This invention directly acquires the charging request from the device to be charged and detects the electrical energy at the charging end. Based on the charging request and the electrical energy at the charging end, it generates an energy compensation strategy and produces a corresponding compensation voltage coupled to the charging end. This compensation voltage is then output to the charging end along with the electrical energy output from the charging device, allowing the charging end's output voltage to quickly reach the requested voltage and satisfy the charging request of the device. By real-time detection of the charging request and the electrical energy at the charging end, a compensation voltage is immediately output when there is an imbalance between the two, ensuring that the charging end's output voltage always meets the requested voltage of the device, thus improving the response speed and stability of the charging pile. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0048] Figure 1 is a flowchart illustrating an embodiment of the voltage fast compensation method of the present invention;

[0049] Figure 2 is a flowchart illustrating an embodiment of the voltage fast compensation method of the present invention;

[0050] Figure 3 is a flowchart illustrating an embodiment of the voltage fast compensation method of the present invention;

[0051] Figure 4 is a flowchart illustrating an embodiment of the voltage fast compensation method of the present invention;

[0052] Figure 5 is a flowchart illustrating an embodiment of the voltage fast compensation method of the present invention;

[0053] Figure 6 is a structural schematic diagram of an embodiment of the voltage compensation device of the present invention;

[0054] Figure 7 is a structural schematic diagram of an embodiment of the charging pile of the present invention.

[0055] Label Name 100 Charging Terminal 320 Memory 200 Charging Device 330 Processor 300 Voltage Compensation Device 340 Voltage Detection Circuit 310 Power Generation Circuit 350 Isolation Transformer surface

[0056] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0057] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0058] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0059] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0060] Referring to Figure 1, this invention proposes a rapid voltage compensation method applied to a charging pile. The charging pile includes a charging terminal and a charging device. When a device to be charged is connected to the charging terminal, the charging device outputs corresponding electrical energy to the charging terminal according to the charging request of the device to be charged, so as to supply power to the device to be charged. The rapid voltage compensation method includes:

[0061] S100: Obtain the charging parameters of the charging terminal, and generate an energy compensation strategy based on the charging parameters of the charging terminal.

[0062] S200: After generating the corresponding compensation voltage according to the power compensation strategy, it is coupled to the charging terminal.

[0063] The charging station also includes an electronic control board, which comprises multiple sub-control boards and a main control board. The communication terminals of the sub-control boards are connected to the communication terminals of the devices to be charged. During charging, the device to be charged sends a charging request to the sub-control boards, which forward the request to the main control board. The main control board adjusts the charging device's output of corresponding electrical energy to the device to be charged based on the charging request until the charging request is satisfied. This relaying of the charging request through the sub-control boards and main control board inevitably reduces the response speed, causing the charging terminal to be unable to quickly output the voltage required by the device. The device to be charged can be a vehicle.

[0064] The charging device's input terminal is used to connect to a three-phase AC power supply. The charging device includes a power output circuit, which, under the control of the electronic control board, converts the three-phase AC power supply into a corresponding charging power output. The charging terminal connects to the device to be charged via a charging cable.

[0065] The charging station also includes a voltage compensation device, which has an input terminal, an output terminal, and a communication terminal. The input terminal of the voltage compensation device is used to connect to a three-phase AC power supply, while both the output terminal and the communication terminal are connected to the charging terminal. The communication terminal of the voltage compensation device connects to the device to be charged through the charging terminal to directly obtain the charging request from the device. The voltage compensation device is also used to detect the electrical energy at the charging terminal and, based on the new charging request and the electrical energy at the charging terminal, generate an energy compensation strategy to convert the three-phase AC power supply into a corresponding compensation voltage and couple it to the charging terminal.

[0066] Charging parameters include the charging request from the device to be charged and the electrical energy output from the charging unit to the charging terminal. When the charging request from the device to be charged changes, the charging unit cannot respond quickly due to delays caused by multiple relays. In this case, the charging terminal directly obtains the changed charging request from the device to be charged, generates an energy compensation strategy based on the new charging request and the electrical energy at the charging terminal, and generates a corresponding compensation voltage coupled to the charging terminal. This compensation voltage is then output to the charging terminal along with the electrical energy output from the charging unit, allowing the output voltage at the charging terminal to quickly reach the requested voltage and satisfy the charging request of the device to be charged.

[0067] For example, if the current output voltage of the charging device is 500V, then the current voltage at the charging end is also 500V. If, at the next moment, the charging request from the device to be charged changes from 500V to 505V, due to the relay delay in multi-level communication, the charging device cannot immediately adjust its output voltage to 505V and will still output 500V, meaning the charging end remains at 500V. However, the voltage compensation device can directly obtain the 505V charging request and, based on the 505V request and the 500V charging voltage at the charging end, immediately adjust its output compensation voltage to 5V, allowing the charging end's output voltage to quickly track 505V and achieve rapid response to the charging request from the device to be charged. Alternatively, if the current output voltage of the charging device is 500V, then the current voltage at the charging end is also 500V. If, at the next moment, the charging request from the device to be charged changes from 500V to 495V, due to the relay delay in multi-level communication, the charging device cannot immediately adjust its output voltage to 495V and will still output 500V, meaning the charging end remains at 500V. The voltage compensation device can directly acquire a 495V charging request and immediately adjust its output compensation voltage to -5V based on the 495V charging request and the 500V charging voltage at the charging terminal. This allows the output voltage at the charging terminal to quickly track 495V, achieving rapid response to the charging request of the device being charged. Alternatively, if the current output voltage of the charging device is 500V, then the current voltage at the charging terminal is 500V. If the charging request from the device being charged remains 500V at the next moment, and the charging terminal still maintains 500V, the voltage compensation device can directly acquire a 500V charging request and immediately adjust its output compensation voltage to 0V based on the 500V charging request and the 500V charging voltage at the charging terminal.

[0068] This invention can generate a corresponding compensation voltage and couple it to the charging end based on a new charging request and the charging end's power generation and compensation strategy, flexibly compensating the charging end's output voltage to reach the required voltage. When the charging request of the device to be charged changes, there is no need to frequently control the charging device to change its output voltage. Alternatively, this invention can also generate a corresponding compensation voltage and couple it to the charging end based on a new charging request and the charging end's power generation and compensation strategy, and stop outputting the compensation voltage after the voltage output by the charging device reaches the required voltage through multi-stage relay control by the electronic control board.

[0069] This invention directly acquires the charging request of the device to be charged and detects the electrical energy of the charging terminal by obtaining the charging parameters of the charging terminal. Based on the charging request of the device to be charged and / or the electrical energy of the charging terminal, an energy compensation strategy is generated, and a corresponding compensation voltage is generated and coupled to the charging terminal. This compensation voltage is then output to the charging terminal along with the electrical energy output by the charging device, enabling the output voltage of the charging terminal to quickly reach the requested voltage and satisfy the charging request of the device to be charged. By real-time detection of the charging request and the electrical energy of the charging terminal, a compensation voltage is immediately output when the two are unbalanced, ensuring that the output voltage of the charging terminal always meets the requested voltage of the device to be charged, thus improving the response speed and stability of the charging pile.

[0070] In one embodiment, obtaining the charging parameters of the charging terminal to generate an energy compensation strategy based on the charging parameters specifically includes:

[0071] The system acquires the charging request of the device to be charged and / or detects the electrical energy output from the charging device to the charging terminal, so as to generate an electrical energy compensation strategy based on the charging request of the device to be charged and / or the electrical energy of the charging terminal.

[0072] This invention directly acquires the charging request from the device to be charged and / or detects the electrical energy at the charging terminal. Based on the charging request and the electrical energy at the charging terminal, it generates an energy compensation strategy and produces a corresponding compensation voltage coupled to the charging terminal. This compensation voltage, along with the electrical energy output from the charging device, is then output to the charging terminal, allowing the charging terminal's output voltage to quickly reach the requested voltage and satisfy the charging request of the device. By real-time detection of the charging request and the electrical energy at the charging terminal, a compensation voltage is immediately output when there is an imbalance, ensuring that the charging terminal's output voltage always meets the requested voltage of the device, thus improving the response speed and stability of the charging pile.

[0073] In one embodiment, the step of acquiring the charging request of the device to be charged and / or detecting the electrical energy output by the charging device to the charging terminal, so as to generate an energy compensation strategy based on the charging request of the device to be charged and / or the electrical energy of the charging terminal, specifically includes:

[0074] S110: Obtain the requested voltage from the charging request of the device to be charged and detect the current voltage of the charging terminal;

[0075] S120: Subtract the current voltage from the requested voltage to obtain a voltage difference value, and generate an energy compensation strategy based on the voltage difference value.

[0076] When the charging request of the device to be charged changes, the charging device cannot respond quickly due to the delay caused by multiple relays. At this time, the charging terminal directly obtains the changed charging request of the device to be charged, generates an energy compensation strategy based on the new charging request and the power supply of the charging terminal, and generates a corresponding compensation voltage coupled to the charging terminal. This compensation voltage is then output to the charging terminal along with the power output of the charging device, so that the output voltage of the charging terminal can quickly reach the requested voltage and meet the charging request of the device to be charged.

[0077] For example, if the current output voltage of the charging device is 500V, then the current voltage at the charging end is also 500V. If, at the next moment, the charging request from the device to be charged changes from 500V to 505V, due to the delay in multi-level communication, the charging device cannot immediately adjust its output voltage to 505V and will still output 500V, meaning the charging end remains at 500V. However, the voltage compensation device can directly obtain the 505V charging request and subtract the 500V charging voltage at the charging end to get a 5V voltage difference. The voltage compensation device then immediately adjusts its output compensation voltage to 5V, allowing the voltage at the charging end to quickly track 505V, achieving a rapid response to the charging request from the device to be charged. Alternatively, if the current output voltage of the charging device is 500V, then the current voltage at the charging end is also 500V. If, at the next moment, the charging request from the device to be charged changes from 500V to 495V, due to the relay delay in multi-level communication, the charging device cannot immediately adjust its output voltage to 495V and will still output a 500V charging voltage; that is, the charging end remains at 500V. However, the voltage compensation device can directly acquire the 495V charging request and subtract it from the 500V charging voltage at the charging end, obtaining a voltage difference of -5V. The voltage compensation device then immediately adjusts its output compensation voltage to -5V, allowing the charging end's output voltage to quickly track 495V, achieving a rapid response to the charging request from the device to be charged. Alternatively, if the current output voltage of the charging device is 500V, then the current voltage at the charging end is also 500V. If, at the next moment, the charging request from the device to be charged is still 500V, the voltage compensation device can directly acquire the 495V charging request and subtract it from the 500V charging voltage at the charging end, obtaining a voltage difference of 0V. The voltage compensation device will then immediately adjust the output compensation voltage to 0V.

[0078] This embodiment obtains the requested voltage from the charging request of the device to be charged and detects the current voltage of the charging terminal. It calculates the difference between the requested voltage and the current voltage of the charging terminal to obtain the voltage difference value. Based on the voltage difference value, it generates a power compensation strategy to quickly make compensation adjustments and output a compensation voltage to ensure that the output voltage of the charging terminal always meets the requested voltage of the device to be charged.

[0079] In one embodiment, generating an energy compensation strategy based on the voltage difference includes:

[0080] S121: When the voltage difference is negative, a negative compensation voltage is generated based on the voltage difference, and the negative compensation voltage is coupled to the charging terminal;

[0081] S122: When the voltage difference is positive, a positive compensation voltage is generated according to the voltage difference, and the positive compensation voltage is coupled to the charging terminal;

[0082] S123: When the voltage difference is equal to zero, a 0V compensation voltage is generated based on the voltage difference, and the 0V compensation voltage is coupled to the charging terminal.

[0083] The voltage compensation device includes an isolation transformer. A negative voltage difference indicates that the current output voltage of the charging device is too high, and the charging end needs to compensate with a negative voltage. For example, if the current output voltage of the charging device is 500V, then the current voltage at the charging end is also 500V. If, at the next moment, the charging request from the device to be charged changes from 500V to 495V, due to the relay delay in multi-level communication, the charging device cannot immediately adjust its output voltage to 495V and will still output a 500V charging voltage; that is, the charging end remains at 500V. However, the voltage compensation device can directly obtain the 495V charging request and calculate the difference between the 495V charging request and the 500V charging voltage at the charging end, obtaining a -5V voltage difference. The voltage compensation device then immediately controls the isolation transformer to couple out a -5V compensation voltage, allowing the voltage output at the charging end to quickly track 495V.

[0084] When the voltage difference is positive, it indicates that the current output voltage of the charging device is too low, and the charging end needs to compensate with a positive voltage. For example, if the current output voltage of the charging device is 500V, then the current voltage at the charging end is also 500V. If, at the next moment, the charging request from the device to be charged changes from 500V to 505V, due to the delay in multi-level communication, the charging device cannot immediately adjust its output voltage to 505V and will still output 500V, meaning the charging end remains at 500V. However, the voltage compensation device can directly obtain the 505V charging request and calculate the difference between the 505V request and the 500V charging voltage at the charging end, obtaining a 5V voltage difference. The voltage compensation device then immediately controls the isolation transformer to couple and output a 5V compensation voltage, allowing the voltage output at the charging end to quickly track 505V.

[0085] If the voltage difference is zero, it means that the current output voltage of the electrical device meets the requested voltage of the device to be charged. Then, the voltage compensation device controls the isolation transformer to couple out a compensation voltage of 0V.

[0086] In this embodiment, a corresponding compensation voltage is output to the charging terminal based on the difference between the requested voltage and the voltage at the output terminal of the charging device, so as to quickly respond to the requested voltage of the device to be charged and improve the response speed.

[0087] In one embodiment, the step of acquiring the charging request of the device to be charged and / or detecting the electrical energy output by the charging device to the charging terminal, so as to generate an energy compensation strategy based on the charging request of the device to be charged and / or the electrical energy of the charging terminal, specifically includes:

[0088] S130: Sample the voltage at the output terminal of the charging device at a preset sampling period, and obtain the voltage at the output terminal of the charging device in two adjacent periods.

[0089] S140: Obtain the actual voltage change rate based on the voltage at the output terminal of the charging device within two adjacent cycles;

[0090] S150: Generate an energy compensation strategy based on the voltage at the output of the charging device and the actual voltage change rate in two adjacent cycles.

[0091] Abnormal conditions may cause uncontrollable over / under voltage fluctuations at the output of the charging device for a short period. Since there is a control cycle delay between acquiring and calculating the requested voltage and the voltage at the charging device's output to obtain the compensation voltage and the actual compensation voltage output, overshoot caused by this control delay can be reduced through predictive correction. The actual voltage change rate for the current sampling period is obtained by calculating the voltage of the previous sampling period and the voltage of the current sampling period. When the actual voltage change rate is too large or too small, it can be determined that a momentary over / under voltage has occurred. If the momentary voltage change is small, it will not trigger the over / under voltage shutdown protection. At this time, if the voltage at the charging device's output is found to be inconsistent with the requested voltage, the compensation voltage is calculated and output according to the above method. To avoid instability in the charging terminal output voltage due to the control cycle delay before detecting, calculating, and outputting the compensation voltage, this embodiment obtains a predicted compensation voltage by calculating the voltage of the previous sampling period and the voltage of the current sampling period, and generates a corresponding compensation voltage based on the predicted compensation voltage, which is then coupled and output to the charging terminal.

[0092] When the voltage at the output terminal of the charging device is over-voltage or under-voltage, this embodiment can also quickly detect it and output the corresponding compensation voltage in a timely manner, so as to avoid the over / under-voltage of the power unit from affecting the charging and safety of the device to be charged and improve the stability of the system.

[0093] In one embodiment, obtaining the actual voltage change rate based on the voltage at the output terminal of the charging device within two adjacent cycles includes:

[0094] The difference between the voltage of the previous sampling period and the voltage of the current sampling period is obtained to obtain the sampling voltage difference value.

[0095] The actual voltage change rate is obtained by calculating the quotient of the sampled voltage difference and the voltage of the previous sampling period.

[0096] The formula for calculating the actual voltage change rate is: (Uabpst - Uablst) / Uabpst.

[0097] Where Uabpst is the voltage value of the current sampling period, and Uablst is the voltage value of the previous sampling period.

[0098] This embodiment uses the rate of change of voltage in the current sampling period as the basis for determining whether there is overvoltage or undervoltage at the output of the charging device, so as to quickly detect overvoltage / undervoltage.

[0099] In one embodiment, the power compensation strategy includes:

[0100] When the actual voltage change rate is outside the preset voltage change rate range, a compensation voltage is generated based on the voltage of the previous sampling period and the voltage of the current sampling period.

[0101] Taking a preset voltage change rate range of [-18%, +18%] as an example, when the actual voltage change rate is outside the preset voltage change rate range and is greater than zero, such as +20%, it indicates that the voltage at the output terminal of the charging device has exceeded the voltage limit, and the charging terminal needs negative voltage compensation. At this time, the voltage of the previous sampling period and the voltage of the current sampling period are calculated to obtain the predicted compensation voltage, and a corresponding compensation voltage is generated and coupled to the charging terminal based on the predicted compensation voltage.

[0102] When the actual voltage change rate is outside the preset voltage change rate range and less than zero, for example, -20%, it indicates that the voltage at the output terminal of the charging device is undervoltage, and positive voltage compensation is required at the charging terminal. When the actual voltage change rate is within the preset voltage change rate range, it indicates that the voltage at the output terminal of the charging device is not experiencing instantaneous over / undervoltage. At this time, the voltage of the previous sampling period and the voltage of the current sampling period are calculated to obtain the predicted compensation voltage, and a corresponding compensation voltage is generated and coupled to the charging terminal based on the predicted compensation voltage.

[0103] In this embodiment, when the voltage output at the charging device is over / under-voltage, during the control delay before detecting, calculating and outputting the compensation voltage, a corresponding compensation voltage is generated based on the voltage of the previous sampling cycle and the voltage of the current sampling cycle, and then output to the charging terminal in a timely manner to ensure the stability of the output voltage at the charging terminal.

[0104] In one embodiment, generating the predicted compensation voltage based on the voltage of the previous sampling period and the voltage of the current sampling period specifically includes:

[0105] The difference between the voltage of the previous sampling period and the voltage of the current sampling period is obtained to obtain the sampling voltage difference value.

[0106] Calculate the product of the sampled voltage difference and the predicted compensation coefficient to obtain the predicted compensation voltage value;

[0107] The predicted compensation voltage value is inverted to obtain the compensation voltage.

[0108] In this embodiment, the formula for calculating the predicted compensation voltage value is: Ubc=(Uabpst-Uablst)*(1+K). Where Ubc is the compensation voltage value, and K is the prediction correction coefficient determined based on the output characteristics of the charging device and the magnitude of the requested voltage.

[0109] Taking a preset voltage change rate range of [-18%, +18%] as an example, when the actual voltage change rate is outside the preset voltage change rate range and is greater than zero, such as +20%, it indicates that the voltage at the output terminal of the charging device has been over-voltaged and the charging terminal needs negative voltage compensation. However, the predicted compensation voltage value obtained according to the calculation formula of the predicted compensation voltage is positive, so it is necessary to invert the predicted compensation voltage value before outputting it.

[0110] When the actual voltage change rate is outside the preset voltage change rate range and is less than zero, for example -20%, it indicates that the voltage at the output terminal of the charging device is undervoltage and positive voltage compensation is required at the charging terminal. However, the compensation voltage value obtained according to the calculation formula of the predicted compensation voltage is negative, so the predicted compensation voltage value needs to be inverted before output.

[0111] In this embodiment, when the voltage output at the charging device is over / under-voltage, during the control delay before detecting, calculating and outputting the compensation voltage, a predicted compensation voltage is generated based on the voltage of the previous sampling cycle and the voltage of the current sampling cycle. The predicted compensation voltage is then inverted to obtain the actual compensation voltage to be output, thereby generating a voltage difference relative to the over / under-voltage and outputting it to the charging terminal to ensure the stability of the output voltage at the charging terminal.

[0112] In one embodiment, the fast voltage compensation method further includes:

[0113] S300: Detect the voltage output by the charging device to the charging terminal;

[0114] S400: Extract the voltage amplitude of the voltage output by the charging device to the charging terminal at each frequency within a preset frequency range;

[0115] S500: Generate a compensation voltage corresponding to each frequency based on the voltage amplitude of each frequency and the preset voltage amplitude;

[0116] S600: Couples the compensation voltage to the output terminal.

[0117] Under steady-state conditions, the voltage at the output terminal of the charging device exhibits low-frequency fluctuations, which in turn lead to low-frequency fluctuations in the output voltage at the charging terminal. When the output voltage of the charging pile experiences low-frequency fluctuations, it may also cause low-frequency fluctuations in the output current. If the fluctuations are significant, they may trigger a fault, causing the charging pile to stop working.

[0118] To compensate for this low-frequency fluctuation, in one embodiment, the voltage output from the charging device to the charging terminal is detected, and the voltage signal within a preset frequency range is transformed from the time domain to the frequency domain using a Fast Fourier Transform to extract the voltage amplitude at each frequency within the preset frequency range. The specific formula is as follows: Where Uab is the voltage output from the charging device to the charging terminal, x is the frequency, the voltage amplitude at frequency x is Ux, and m ranges from 1 to m to 50. The compensation voltage for each frequency is obtained by subtracting the preset voltage amplitude from the voltage amplitude at each frequency. When the compensation voltage is negative, negative voltage compensation is output; when the compensation voltage is positive, positive voltage compensation is output; when the compensation voltage is zero, 0V compensation voltage is output.

[0119] This embodiment extracts the fluctuation of the voltage signal output from the charging device to the charging terminal within a preset frequency range, calculates the difference between the preset voltage amplitude and the fluctuation voltage amplitude to obtain a compensation voltage, and outputs the compensation voltage to the charging terminal to compensate for the final output voltage fluctuation of the charging terminal and improve the stability of the output voltage of the charging terminal.

[0120] In one embodiment, generating the compensation voltage corresponding to each frequency based on the voltage amplitude of each frequency and a preset voltage amplitude specifically involves:

[0121] The voltage amplitude at each frequency is subtracted from the preset voltage amplitude to obtain the corresponding voltage difference value for each frequency.

[0122] The voltage difference between each frequency is used as a compensation voltage and coupled to the charging terminal.

[0123] When the compensation voltage is negative, the output is negative voltage compensation; when the compensation voltage is positive, the output is positive voltage compensation; when the compensation voltage is zero, the output is 0V compensation voltage.

[0124] In this embodiment, a compensation voltage is obtained by subtracting the preset voltage amplitude from the fluctuating voltage amplitude, and the compensation voltage is output to the charging terminal to compensate for the output voltage fluctuation of the charging terminal and improve the stability of the output voltage of the charging terminal.

[0125] In one embodiment, the fast voltage compensation method further includes:

[0126] When the current voltage at the output terminal of the charging device reaches the requested voltage, the output of the compensation voltage is stopped.

[0127] When the charging request of the device to be charged changes, for example, if the current output voltage of the charging device is 500V, then the current voltage at the charging end is also 500V. At the next moment, the charging request of the device changes from 500V to 495V. Due to the relay delay in multi-level communication, the charging device cannot immediately adjust its output voltage to 495V and continues to output a 500V charging voltage. However, the voltage compensation device can directly obtain the 495V charging request and calculate the difference between the 495V request and the 500V charging voltage at the charging end, obtaining a -5V voltage difference. The voltage compensation device then immediately controls the isolation transformer to couple out a -5V compensation voltage, allowing the voltage output at the charging end to quickly track 495V. Simultaneously, after receiving the 495V request voltage, the control board outputs a control signal to the charging device to reduce its output voltage to 495V. The voltage compensation device is also used to detect the voltage at the output of the charging device. When the voltage at the output of the charging device matches the requested voltage of 495V, the voltage compensation device adjusts the compensation voltage output of the isolation transformer to 0V.

[0128] Alternatively, if the current output voltage of the charging device is 500V, then the current voltage at the charging end is also 500V. If, at the next moment, the charging request from the device to be charged changes from 500V to 505V, due to the delay in multi-level communication, the charging device cannot immediately adjust its output voltage to 505V and will continue to output 500V, meaning the charging end remains at 500V. However, the voltage compensation device can directly acquire the 495V charging request and subtract the 500V charging voltage at the charging end from the 505V request voltage, obtaining a -5V voltage difference. The voltage compensation device then immediately controls the isolation transformer to couple out a -5V compensation voltage, allowing the voltage output at the charging end to quickly track 505V. Simultaneously, upon receiving the 505V request voltage, the control board outputs a control signal to the charging device to reduce its output voltage to 505V. The voltage compensation device is also used to detect the voltage at the output of the charging device. When the voltage at the output of the charging device matches the requested voltage of 505V, the voltage compensation device adjusts the compensation voltage output of the isolation transformer to 0V.

[0129] By real-time monitoring of the requested voltage of the device to be charged and the output voltage of the charging device, an immediate action is taken when the two are unbalanced, outputting a corresponding compensation voltage. This avoids instability in the charging terminal output voltage caused by the control cycle delay in the charging device receiving the control signal and outputting the requested voltage, ensuring that the output voltage of the charging pile always meets the requested voltage. In this embodiment, when the voltage at the output of the charging device reaches the requested voltage, the output of the compensation voltage stops, completing the compensation action.

[0130] The principles of the present invention will now be explained in conjunction with the accompanying drawings:

[0131] When the requested voltage of the device being charged changes, the charging device cannot quickly respond to the requested voltage due to multi-level communication relay. However, the voltage compensation device directly obtains the new requested voltage and immediately makes compensation adjustments. The compensation voltage Ubc = Uref - Uab, where Uref is the requested voltage.

[0132] Specifically, for example, if the current output voltage of the charging device is 500V, then the current voltage at the charging end is also 500V. At the next moment, if the requested voltage of the device to be charged changes from 500V to 495V, the voltage compensation device can directly obtain the requested voltage of 495V and calculate the difference between the 495V charging request and the 500V charging voltage at the charging end, resulting in a voltage difference of -5V. The voltage compensation device then immediately controls the isolation transformer to couple out a -5V compensation voltage, allowing the voltage output at the charging end to quickly track 495V. Simultaneously, after receiving the 495V request voltage, the control board begins adjusting the charging device to reduce its output voltage to 495V. The voltage compensation device also detects the voltage at the output of the charging device. When the voltage at the charging device's output matches the requested voltage of 495V, the voltage compensation device adjusts the compensation voltage output from the isolation transformer to 0V.

[0133] Alternatively, if the requested voltage of the device to be charged changes from 500V to 505V at the next moment, the voltage compensation device can directly obtain the requested voltage of 505V and calculate the difference between the requested voltage of 505V and the charging voltage of 500V at the charging end, obtaining a voltage difference of 5V. The voltage compensation device then immediately controls the isolation transformer to couple and output a compensation voltage of 5V, allowing the voltage output at the charging end to quickly track 505V. Simultaneously, after receiving the requested voltage of 505V, the control board begins to adjust the charging device to reduce its output voltage to 505V. The voltage compensation device is also used to detect the voltage at the output end of the charging device. When the voltage at the output end of the charging device matches the requested voltage of 505V, the voltage compensation device adjusts the compensation voltage output of the isolation transformer to 0V.

[0134] Alternatively, if the voltage difference is zero, it means that the current output voltage of the electrical device meets the requested voltage of the device being charged, and no compensation is needed.

[0135] Abnormal conditions may cause uncontrollable over / under voltage fluctuations at the output of the charging device for a short period. Since there is a control cycle delay between the calculated requested voltage, the compensated voltage at the charging device's output, and the actual compensated voltage, overshoot caused by this control delay can be reduced through predictive correction. The voltage compensation device detects the voltage at the charging device's output in the previous sampling cycle and the voltage in the current sampling cycle. It calculates the actual voltage change rate using the formula (Uabpst - Uablst) / Uabpst, and calculates the predicted compensation voltage using the formula Ubc = (Uabpst - Uablst)*(1+K). When the actual voltage change rate is outside the preset range, it indicates that the voltage at the charging device's output is over- or under-voltage. In this case, the voltage compensation device outputs the corresponding compensation voltage based on the predicted compensation voltage to prevent over / under voltage from affecting the device being charged and to improve system stability.

[0136] Specifically, taking a preset voltage change rate range of [-18%, +18%] as an example, when the actual voltage change rate is outside the preset voltage change rate range and is greater than zero, such as +20%, it indicates that the voltage at the output terminal of the charging device has been over-voltaged, and the voltage compensation device needs to output negative voltage compensation; however, the predicted compensation voltage value obtained according to the calculation formula of the predicted compensation voltage is positive, so it is necessary to invert the predicted compensation voltage value before outputting it.

[0137] When the actual voltage change rate is outside the preset voltage change rate range and is less than zero, for example -20%, it indicates that the voltage at the output terminal of the charging device is undervoltage, and the voltage compensation device needs to output positive voltage compensation. However, the compensation voltage value obtained according to the calculation formula of the predicted compensation voltage is negative, so it is necessary to invert the predicted compensation voltage value before outputting it.

[0138] Under steady-state conditions, the voltage at the output terminal of the charging device exhibits low-frequency fluctuations, which in turn lead to low-frequency fluctuations in the output voltage at the charging terminal. When the output voltage of the charging pile experiences low-frequency fluctuations, it may also cause low-frequency fluctuations in the output current. Significant fluctuations in these fluctuations could trigger a fault, causing the charging pile to stop operating. Therefore, a voltage compensation device is needed to compensate for these low-frequency fluctuations to ensure the stability of the output voltage at the charging terminal.

[0139] Specifically, the output voltage signal at the charging terminal within a preset frequency range is transformed from the time domain to the frequency domain using a Fast Fourier Transform (FFT) to extract the voltage amplitude at each frequency within the preset frequency range. The specific formula is as follows: Where Uab is the output voltage of the charging device, x is the frequency, and the voltage amplitude at frequency x is Ux, where 1 ≤ m ≤ 50. The compensation voltage for each frequency is obtained by subtracting the preset voltage amplitude from the voltage amplitude at each frequency. When the compensation voltage is negative, the voltage compensation device outputs negative compensation through an isolation transformer; when the compensation voltage is positive, the voltage compensation device outputs positive compensation through an isolation transformer; when the compensation voltage is zero, the voltage compensation device does not output compensation voltage.

[0140] This invention detects the requested voltage of the device to be charged and the output voltage of the charging device in real time. When the two are unbalanced, it immediately takes action to output a corresponding compensation voltage to ensure the stability of the output voltage at the charging end.

[0141] The present invention also provides a voltage compensation device 300, which is applied to a charging pile. The charging pile includes a charging terminal 100 and a charging device 200. The charging device 200 is used to output corresponding electrical energy to the charging terminal 100 according to the charging request of the device to be charged when the device to be charged is connected to the charging terminal 100, so as to supply the device to be charged. The voltage compensation device 300 includes an electrical energy generation circuit 310, a memory 320 and a processor 330.

[0142] The charging terminal 100 includes a power output interface and a communication interface; the communication interface of the charging terminal 100 is connected to the charging device 200 via a first communication bus.

[0143] The power generation circuit 310 has an input terminal, an output terminal, and a controlled terminal. The input terminal of the power generation circuit 310 is used to connect to a power source. The output terminal of the power generation circuit 310 is connected to the power output interface of the charging terminal 100. The controlled terminal of the power generation circuit 310 is connected to the processor 330. The power generation circuit 310 is used to output a compensation voltage under the control of the processor 330.

[0144] The processor 330 and the charging terminal 100 are connected via a second communication bus to obtain the charging request from the device to be charged.

[0145] The memory 320 is electrically connected to the processor 330. The memory 320 stores a voltage fast compensation method program. When the voltage fast compensation method program is executed by the processor 330, it implements the voltage fast compensation method described above.

[0146] The input terminal of the power generation circuit 310 is used to connect to a three-phase AC power source. The power generation circuit 310 is used to convert the three-phase AC power source into a corresponding compensated voltage output under the control of the processor 330.

[0147] This invention directly obtains the charging request of the device to be charged through a voltage compensation device. Compared with the charging device, the voltage compensation device does not need to go through multiple relay delays, so it can obtain new charging requests faster and immediately output compensation voltage, ensuring that the output voltage of the charging end always meets the requested voltage of the device to be charged, thereby improving the response speed and stability of the charging pile.

[0148] In one embodiment, the voltage compensation device 300 further includes a voltage detection circuit 340 and an isolation transformer 350;

[0149] The input terminal of the voltage detection circuit 340 is used to detect the voltage at the output terminal of the charging device 200, and the output terminal of the voltage detection circuit 340 is connected to the processor 330.

[0150] The input terminal of the isolation transformer 350 is connected to the output terminal of the power generation circuit 310, and the output terminal of the isolation transformer 350 is connected to the charging terminal 100. The isolation transformer 350 is used to couple the compensation voltage to the charging terminal 100.

[0151] In this embodiment, the voltage detection circuit 340 detects the voltage at the output terminal of the charging device 200 in real time, and calculates the compensation voltage together with the requested voltage. The compensation voltage is output to the charging terminal 100 through the isolation transformer 350. The voltage compensation device 300 has no direct electrical connection with the device to be charged, which provides better safety.

[0152] The present invention also provides a charging pile, the charging pile including a charging terminal 100, a charging device 200 and the voltage compensation device 300 described above;

[0153] The charging device 200 is connected to the charging terminal 100. When the charging terminal 100 is connected to the device to be charged, the charging device 200 outputs corresponding electrical energy to the charging terminal 100 according to the charging request of the device to be charged, so as to charge the device to be charged.

[0154] The voltage compensation device 300 is connected to the charging terminal 100. The voltage compensation device 300 is used to acquire the charging request of the device to be charged and detect the electrical energy output by the charging device 200 to the charging terminal 100, so as to generate an electrical energy compensation strategy according to the charging request of the device to be charged and the electrical energy of the charging terminal 100; and generate a corresponding compensation voltage according to the electrical energy compensation strategy and couple it to the charging terminal 100.

[0155] The charging station also includes an electronic control board, which comprises multiple sub-control boards and a main control board. The communication terminals of the sub-control boards are connected to the communication terminals of the devices to be charged. During charging, the device to be charged sends a charging request to the sub-control boards, which forward the request to the main control board. The main control board adjusts the output of the charging device 200 to provide the corresponding electrical energy to the device to be charged until the charging request is satisfied. Because the charging request from the device to be charged passes through the sub-control boards and the main control board, the response speed is inevitably reduced, causing the charging terminal 100 to be unable to quickly output the voltage required by the device to be charged. The device to be charged can be a vehicle.

[0156] The input terminal of the charging device 200 is used to connect to a three-phase AC power supply. The charging device 200 includes a power output circuit, which converts the three-phase AC power supply into a corresponding charging power supply under the control of the electronic control board. The charging terminal 100 is connected to the device to be charged via a charging cable.

[0157] When the charging request of the device to be charged changes, the charging device 200 cannot respond quickly due to the delay caused by the multi-level relay. At this time, the charging terminal 100 directly obtains the changed charging request of the device to be charged, generates a power compensation strategy based on the new charging request and the power of the charging terminal 100, and generates a corresponding compensation voltage coupled to the charging terminal 100. This compensation voltage is then output to the charging terminal 100 together with the power output of the charging device 200, so that the output voltage of the charging terminal 100 can quickly reach the requested voltage and meet the charging request of the device to be charged.

[0158] For example, if the current output voltage of charging device 200 is 500V, then the current voltage of charging terminal 100 is also 500V. If, at the next moment, the charging request from the device to be charged changes from 500V to 505V, due to the relay delay in multi-level communication, charging device 200 cannot immediately adjust its output voltage to 505V and will still output a 500V charging voltage; that is, charging terminal 100 will still be at 500V. However, voltage compensation device 300 can directly obtain the 505V charging request and, based on the 505V charging request and the 500V charging voltage of charging terminal 100, immediately adjust its output compensation voltage to 5V, allowing the voltage output of charging terminal 100 to quickly track 505V and achieve rapid response to the charging request from the device to be charged. Alternatively, if the current output voltage of charging device 200 is 500V, then the current voltage of charging terminal 100 is also 500V. If, at the next moment, the charging request from the device to be charged changes from 500V to 495V, due to the relay delay in multi-level communication, the charging device 200 cannot immediately adjust its output voltage to 495V and continues to output a 500V charging voltage; that is, the charging terminal 100 remains at 500V. However, the voltage compensation device 300 can directly obtain the 495V charging request and, based on the 495V charging request and the 500V charging voltage at the charging terminal 100, immediately adjust its output compensation voltage to -5V, allowing the voltage output at the charging terminal 100 to quickly track 495V and achieve rapid response to the charging request from the device to be charged. Alternatively, if the current output voltage of the charging device 200 is 500V, then the current voltage at the charging terminal 100 is 500V. At the next moment, the charging request from the device to be charged will still be 500V, meaning the charging terminal 100 will still remain at 500V. The voltage compensation device 300 can directly obtain a 500V charging request and immediately adjust the output compensation voltage to 0V based on the 500V charging request and the 500V charging voltage of the charging terminal 100.

[0159] This invention directly acquires the charging request from the device to be charged and detects the electrical energy at the charging end. Based on the charging request and the electrical energy at the charging end, it generates an energy compensation strategy and produces a corresponding compensation voltage coupled to the charging end. This compensation voltage is then output to the charging end along with the electrical energy output from the charging device, allowing the charging end's output voltage to quickly reach the requested voltage and satisfy the charging request of the device. By real-time detection of the charging request and the electrical energy at the charging end, a compensation voltage is immediately output when there is an imbalance between the two, ensuring that the charging end's output voltage always meets the requested voltage of the device, thus improving the response speed and stability of the charging pile.

[0160] The above are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for rapid voltage compensation, applied to a charging pile, the charging pile comprising a charging terminal and a charging device, the charging device being used to output corresponding electrical energy to the charging terminal according to the charging request of the device to be charged when a device to be charged is connected to the charging terminal, so as to charge the device to be charged, characterized in that, The charging pile also includes a voltage compensation device. The input terminal of the voltage compensation device is used to connect to a three-phase AC power supply. Both the output terminal and communication terminal of the voltage compensation device are connected to the charging terminal. The communication terminal of the voltage compensation device is connected to the device to be charged through the charging terminal. The voltage compensation device is used to execute the fast voltage compensation method. The fast voltage compensation method includes: acquiring the charging parameters of the charging terminal to generate an energy compensation strategy based on the charging parameters; generating a corresponding compensation voltage based on the energy compensation strategy and coupling it to the charging terminal. Acquiring the charging parameters of the charging terminal to generate an energy compensation strategy specifically includes: acquiring the charging request of the device to be charged and / or detecting the energy output by the charging device to the charging terminal, to generate an energy compensation strategy based on the charging parameters of the device to be charged and / or the energy output by the charging device to the charging terminal. The power generation and compensation strategy at the charging terminal; the step of acquiring the charging request of the device to be charged and / or detecting the power output from the charging device to the charging terminal, so as to generate a power compensation strategy based on the charging request of the device to be charged and / or the power at the charging terminal, specifically includes: sampling the voltage at the output terminal of the charging device at a preset sampling period, and acquiring the voltage at the output terminal of the charging device in two adjacent periods; obtaining the actual voltage change rate based on the voltage at the output terminal of the charging device in two adjacent periods; generating a power compensation strategy based on the voltage at the output terminal of the charging device in two adjacent periods and the actual voltage change rate; the power compensation strategy includes: when the actual voltage change rate is outside the preset voltage change rate range, generating a compensation voltage based on the voltage of the previous sampling period and the voltage of the current sampling period.

2. The voltage fast compensation method as described in claim 1, characterized in that, The step of acquiring the charging request of the device to be charged and / or detecting the electrical energy output by the charging device to the charging terminal, so as to generate an energy compensation strategy based on the charging request of the device to be charged and / or the electrical energy of the charging terminal, specifically includes: acquiring the requested voltage in the charging request of the device to be charged and detecting the current voltage of the charging terminal; subtracting the current voltage from the requested voltage to obtain a voltage difference value, and generating an energy compensation strategy based on the voltage difference value.

3. The voltage fast compensation method as described in claim 1, characterized in that, The step of obtaining the actual voltage change rate based on the voltage at the output terminal of the charging device in two adjacent cycles includes: subtracting the voltage of the previous sampling cycle from the voltage of the current sampling cycle to obtain the sampling voltage difference; and calculating the quotient of the sampling voltage difference and the voltage of the previous sampling cycle to obtain the actual voltage change rate.

4. The voltage fast compensation method as described in claim 1, characterized in that, The step of generating a compensation voltage based on the voltage of the previous sampling period and the voltage of the current sampling period specifically includes: subtracting the voltage of the previous sampling period from the voltage of the current sampling period to obtain a sampling voltage difference; calculating the product of the sampling voltage difference and the predicted compensation coefficient to obtain a predicted compensation voltage value; and inverting the predicted compensation voltage value to obtain the compensation voltage.

5. The voltage fast compensation method as described in claim 2, characterized in that, The rapid voltage compensation method further includes: detecting the voltage output by the charging device to the charging terminal; extracting the voltage amplitude of the voltage output by the charging device to the charging terminal at each frequency within a preset frequency range; generating a compensation voltage corresponding to each frequency based on the voltage amplitude at each frequency and the preset voltage amplitude; and coupling the compensation voltage to the output terminal.

6. The voltage fast compensation method as described in claim 5, characterized in that, The specific steps of generating the compensation voltage corresponding to each frequency based on the voltage amplitude of each frequency and the preset voltage amplitude are as follows: the voltage amplitude of each frequency is subtracted from the preset voltage amplitude to obtain the corresponding voltage difference value for each frequency; and the voltage difference value of each frequency is coupled to the charging terminal as the compensation voltage.

7. The voltage fast compensation method as described in claim 2, characterized in that, The rapid voltage compensation method further includes: stopping the output of compensation voltage when the current voltage at the output terminal of the charging device reaches the requested voltage.

8. A voltage compensation device applied to a charging pile, the charging pile comprising a charging terminal and a charging device, the charging device being configured to output corresponding electrical energy to the charging terminal according to the charging request of the device to be charged when a device to be charged is connected to the charging terminal, so as to charge the device to be charged, characterized in that, The voltage compensation device includes a power generation circuit, a memory, and a processor; the charging terminal includes a power output interface and a communication interface; the communication interface of the charging terminal is connected to the charging device via a first communication bus. The power generation circuit has an input terminal, an output terminal, and a controlled terminal. The input terminal of the power generation circuit is used to connect to a power source. The output terminal of the power generation circuit is connected to the power output interface of the charging terminal. The controlled terminal of the power generation circuit is connected to the processor. The power generation circuit is used to output a compensation voltage under the control of the processor. The communication interface between the processor and the charging terminal is connected through a second communication bus to obtain the charging request from the device to be charged. The memory is electrically connected to the processor, and the memory stores a voltage fast compensation method program. When the voltage fast compensation method program is executed by the processor, it implements the voltage fast compensation method as described in any one of claims 1 to 7.

9. The voltage compensation device as described in claim 8, characterized in that, The voltage compensation device further includes a voltage detection circuit and an isolation transformer; the input terminal of the voltage detection circuit is used to detect the voltage output by the charging device to the power output interface of the charging terminal, and the output terminal of the voltage detection circuit is connected to the processor. The input terminal of the isolation transformer is connected to the output terminal of the power generation circuit, and the output terminal of the isolation transformer is connected to the power output interface of the charging terminal. The isolation transformer is used to couple the compensation voltage to the power output interface of the charging terminal.

10. A charging pile, characterized in that, The charging pile includes a charging terminal, a charging device, and a voltage compensation device as described in claim 8; the charging device is connected to the charging terminal, and the charging device is used to output corresponding electrical energy to the charging terminal according to the charging request of the device to be charged when the device to be charged is connected to the charging terminal, so as to charge the device to be charged; the voltage compensation device is connected to the charging terminal, and the voltage compensation device is used to obtain the charging request of the device to be charged and detect the electrical energy output by the charging device to the charging terminal, so as to generate an electrical energy compensation strategy according to the charging request of the device to be charged and the electrical energy of the charging terminal; And after generating a corresponding compensation voltage according to the power compensation strategy, it is coupled to the charging terminal.

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