A charging pile calibration system and calibration method

Abstract

The present invention relates to a calibration system for a charging pile, wherein the charging pile includes a charging controller, and is characterized in that: the calibration system includes a calibration controller for calibrating the charging controller, wherein the charging controller is provided with a first MCU, and wherein the calibration controller is provided with a second MCU, wherein the first MCU and the second MCU are communicatively connected, wherein the first MCU is provided with a sampling pin, and the second MCU is provided with a calibration pin, wherein the sampling pin on the first MCU is connected to the calibration pin on the second MCU, and is used to send a calibration signal to the first MCU via the second MCU. A calibration method is also disclosed. The calibration system is more convenient and easy to implement, and the calibration controller has high versatility. In addition, the calibration system only needs to calibrate the charging controller separately, and the calibrated charging controller can be assembled with other devices to form a charging pile, thereby reducing the problem of replacing the entire charging pile due to a malfunction of the charging controller.

Description

Technical Field

[0001] The present invention relates to the field of charging piles, and in particular to a calibration system and a calibration method for a charging pile. Background Art

[0002] With the increasing popularity of new energy vehicles, a growing number of charging stations are being installed to meet the needs of more electric vehicles. These stations are installed in public buildings (such as public buildings, shopping malls, and public parking lots) and residential parking lots or charging stations. They can charge various models of electric vehicles at different voltage levels. The input of the charging station is directly connected to the AC power grid, and the output is equipped with a charging plug for charging the electric vehicle. The charging station is a key interface for electric vehicle charging and energy metering. To ensure accuracy and high reliability, the charging station must be calibrated before use.

[0003] A Chinese invention patent application numbered CN201910266044.1 (application publication number CN109870649A) discloses a calibration system and method for an AC charging pile calibration device. The system includes a calibration control and display device, a standard AC charging pile, an error calculation device, and an AC charging pile calibration device. The control input of the standard AC charging pile is connected to the calibration control and display device, the output of the standard AC charging pile is connected to the error calculation device and the AC charging pile calibration device, respectively, the output of the AC charging pile calibration device is connected to the error calculation device, and the output of the error calculation device is connected to the calibration control and display device. The calibration system can be used to calibrate the AC charging pile calibration device, ensuring its reliable operation. However, this calibration system requires the entire charging pile to be powered on before calibration can be performed. Furthermore, powering the charging pile requires activating a high-voltage power supply, which can easily lead to safety incidents. Furthermore, calibration requires using a standard AC charging pile as a benchmark, calculating the error between the standard AC charging pile and the AC charging pile verification device, and then calibrating the AC charging pile verification device. This system requires ensuring that both the standard AC charging pile and the AC charging pile verification device are operating normally, and requires collecting power pulse information and electrical parameters from both charging piles before calibration can be performed. Therefore, the calibration system is complex to operate and takes a long time to calibrate. Therefore, further improvements are needed. Summary of the Invention

[0004] The first technical problem to be solved by the present invention is to provide a calibration system for a charging pile with a simple structure and more convenient calibration in view of the current status of the existing technology.

[0005] The second technical problem to be solved by the present invention is to provide a calibration method for calibrating a charging pile using the above-mentioned calibration system in response to the current status of the existing technology.

[0006] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a calibration system for a charging pile, the charging pile includes a charging controller, and is characterized in that: the calibration system includes a calibration controller for calibrating the charging controller, the charging controller is provided with a first MCU, the calibration controller is provided with a second MCU, the first MCU and the second MCU are communicatively connected, the first MCU is provided with a sampling pin, the second MCU is provided with a calibration pin, the sampling pin on the first MCU is connected to the calibration pin on the second MCU, and is used to send a calibration signal to the first MCU through the second MCU.

[0007] As an improvement, the first MCU and the second MCU are respectively provided with a data sending pin and a data receiving pin, the data sending pin of the first MCU is connected to the data receiving pin of the second MCU, and the data receiving pin of the first MCU is connected to the data sending pin of the second MCU, for realizing the communication connection between the first MCU and the second MCU.

[0008] Preferably, the first MCU and the second MCU are communicated via an interface selected from the group consisting of UART, RS232, RS485, CAN, SPI and I2C.

[0009] Furthermore, the first MCU and the second MCU are respectively provided with a power supply pin and a ground pin, the power supply pin of the first MCU is connected to an external power supply, the ground pin of the first MCU is grounded, the power supply pin on the first MCU is connected to the power supply pin of the second MCU, and the ground pin on the first MCU is connected to the ground pin of the second MCU, which is used to power the calibration controller through the charging controller.

[0010] Furthermore, the second pin of the first MCU outputs a reference voltage, and the second pin of the first MCU is connected to the second pin of the second MCU, so as to provide a reference voltage to the second MCU through the first MCU.

[0011] The charging controller is further provided with a voltage divider circuit, one end of which is grounded, and the other end of which corresponds to the collection end of the charging controller. The middle part of the voltage divider circuit is connected to the sampling pin on the first MCU.

[0012] Specifically, the voltage divider circuit includes two first resistors and a second resistor connected in series, one end of the first resistor corresponds to the collection end of the charging controller, one end of the second resistor is grounded, and the connecting line between the first resistor and the second resistor is connected to the sampling pin on the first MCU.

[0013] In this solution, the calibration signal is a voltage signal or a current signal.

[0014] The technical solution adopted by the present invention to solve the above second technical problem is: a calibration method for charging pile calibration using the above calibration system, characterized in that it includes the following steps:

[0015] Step 1: Determine whether the charge controller needs to be calibrated. If so, set calibration parameters for multiple gears in the charge controller and proceed to step 2. If not, continue to determine whether the charge controller needs to be calibrated.

[0016] Step 2: Determine whether the charging controller and the calibration controller have established a communication connection. If so, proceed to step 3; if not, continue to determine whether the charging controller and the calibration controller have established a communication connection.

[0017] Step 3: The charging controller sends the calibration parameters of one of the gears to the calibration controller;

[0018] Step 4: Determine whether the calibration controller has received the parameters to be calibrated sent by the charging controller. If so, the calibration controller sends the calibration value corresponding to the parameters to be calibrated to the charging controller and proceeds to step 5; if not, proceeds to step 7;

[0019] Step 5: Determine whether the charge controller has received the calibration value. If so, calibrate the current gear and proceed to step 6; if not, proceed to step 7;

[0020] Step 6: Determine whether the charge controller has been calibrated. If so, the process ends; if not, the charge controller sends another gear's parameters to be calibrated to the calibration controller, and the process goes to step 4.

[0021] Step 7: The calibration between the charging controller and the calibration controller is unsuccessful, and the process ends.

[0022] Specifically, the number of gears of the parameter to be calibrated ranges from 3 to 7.

[0023] Compared with the prior art, the advantages of the present invention are: the calibration controller is communicatively connected with the charging controller, so that the calibration controller sends a calibration signal to the charging controller to realize calibration of the charging controller. Therefore, the calibration system is more convenient and easy to implement, and the calibration controller can adapt to the calibration of various types of charging controllers and has strong versatility. In addition, the calibration system does not need to install the charging controller on the charging pile for calibration. It only needs to calibrate the charging controller separately and then assemble the calibrated charging controller with other equipment into a charging pile, which reduces the problem of replacing the entire charging pile due to a failure of the charging controller and improves the production efficiency of the charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1is a functional block diagram of a calibration system according to an embodiment of the present invention;

[0025] Figure 2 Flowchart of calibration between the charging controller and the calibration controller in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0027] The charging pile includes a charging controller, which serves as the control module of the charging pile. The sampling signal of the sampling part of the charging pile is ultimately output through the charging controller. Therefore, the ultimate method for calibrating the charging pile is to calibrate the charging controller. In this embodiment, the charging controller is separated out, and there is no need to install the charging controller in the charging pile to perform power-on calibration of the entire charging pile. The calibration of the charging pile can be achieved by calibrating the independent charging controller.

[0028] A charging pile calibration system includes a calibration controller for calibrating a charging controller. The charging controller includes a first microcontroller (MCU), and the calibration controller includes a second MCU. The first and second MCUs are communicatively connected. The first MCU includes a sampling pin, and the second MCU includes a calibration pin. The sampling pin on the first MCU is connected to the calibration pin on the second MCU, so that a calibration signal is sent to the first MCU via the second MCU. In this embodiment, the calibration signal is a voltage signal or a current signal.

[0029] To achieve communication between the first MCU and the second MCU, the first MCU and the second MCU are each provided with a data transmission pin and a data reception pin. The data transmission pin of the first MCU is connected to the data reception pin of the second MCU, and the data reception pin of the first MCU is connected to the data transmission pin of the second MCU. In this embodiment, the first MCU and the second MCU are communicated via an interface selected from the group consisting of UART, RS232, RS485, CAN, SPI, and I2C.

[0030] The first MCU and the second MCU are each provided with a power pin and a ground pin. The power pin of the first MCU is connected to the external power supply VCC, and the ground pin of the first MCU is grounded. The power pin on the first MCU is connected to the power pin of the second MCU, and the ground pin on the first MCU is connected to the ground pin of the second MCU, for powering the calibration controller via the charging controller. In addition, the second pin of the first MCU outputs a reference voltage, and the second pin of the first MCU is connected to the second pin of the second MCU, for providing a reference voltage to the second MCU via the first MCU. The charging controller powers the calibration controller and provides a reference source through the above connection relationship. Therefore, the calibration controller does not require other external power supplies, and the calibration controller obtains the reference voltage from the charging controller. The calibration controller calibrates by using the charging controller's reference as a reference, thereby improving the accuracy of the charging controller after calibration.

[0031] The charge controller also includes a voltage divider circuit 1. One end of the voltage divider circuit 1 is grounded, and the other end corresponds to the charge controller's acquisition terminal VE. The middle portion of the voltage divider circuit 1 is connected to a sampling pin on the first MCU. In this embodiment, the voltage divider circuit 1 includes two series-connected resistors, a first resistor R1 and a second resistor R2. One end of the first resistor R1 corresponds to the charge controller's acquisition terminal VE, and one end of the second resistor R2 is grounded. The connecting line between the first resistor R1 and the second resistor R2 is connected to the sampling pin on the first MCU. The acquisition terminal VE and the ground terminal PGND form the sampling circuit during normal operation of the charge controller. When the calibration signal is a voltage, the voltage divider circuit converts the high-voltage signal into a low-voltage signal for easy acquisition. During calibration, the acquisition terminal VE is left floating.

[0032] like Figure 1As shown, the first MCU in the charging controller corresponds to MCU1, and MCU1 has 6 pins, pin 1 is a power pin, which is connected to the external power supply VCC; pin 2 is a reference pin, which outputs a reference voltage; pin 3 is a sampling pin, which receives an AD signal; pin 4 is a data transmission pin TX1; pin 5 is a data reception pin RX1; and pin 6 is a ground pin. The second MCU in the calibration controller corresponds to MCU2, and MCU2 has 6 pins, pin 1 is a power pin, which is connected to pin 1 of MCU1; pin 2 is connected to pin 2 of MCU1, for obtaining the reference voltage Vref of the charging controller; pin 3 is a calibration pin, which is connected to pin 3 of MCU1; pin 4 is a data reception pin RX2; pin 5 is a data transmission pin TX2; and pin 6 is a ground pin. The AD signal received by the sampling pin on the first MCU is only a figurative description of the calibration analog signal given by the calibration controller sent to the charging controller, and the DA output by the calibration pin on the second MCU is the analog signal required for calibration of the calibration controller.

[0033] In use, by connecting the charge controller and the calibration controller as follows Figure 1 The charging controller supplies power and provides a reference voltage for the calibration controller. In addition, RX2 in the calibration controller is connected to TX1 in the charge controller, and TX2 in the calibration controller is connected to RX1 in the charge controller. At this time, the calibration controller and the charge controller communicate with each other, and a calibration signal can be sent to the sampling pin of the charge controller through the calibration pin of the calibration controller to complete the calibration of the charge controller.

[0034] Of course, the above calibration system can also be used to calibrate a simulated temperature signal. When the calibration signal is a temperature signal, the voltage of the acquisition terminal VE of the charging controller is set to a fixed value. The first resistor R1 is a resistor that can change with temperature or humidity. The theoretical voltage of the third pin of the charging controller at different temperatures is calculated based on the different resistance values ​​corresponding to the first resistor R1 at different temperatures. During actual calibration, the acquisition terminal VE is left floating. During actual calibration, the theoretical voltage values ​​at different temperatures are sent to the charging controller through the calibration controller, which is similar to the change in the resistance value of the first resistor R1 when the acquisition terminal VE is connected to a fixed value, thereby simulating the calibration of the temperature signal.

[0035] Among them, Figure 2 As shown, the method for calibration using the above calibration system includes the following steps:

[0036] Step 1: Determine whether the charge controller needs to be calibrated. If so, set calibration parameters for multiple gears in the charge controller and proceed to step 2. If not, continue to determine whether the charge controller needs to be calibrated.

[0037] Step 2: Determine whether the charging controller and the calibration controller have established a communication connection. If so, proceed to step 3; if not, continue to determine whether the charging controller and the calibration controller have established a communication connection.

[0038] Step 3: The charging controller sends the calibration parameters of one of the gears to the calibration controller;

[0039] Step 4: Determine whether the calibration controller has received the parameters to be calibrated sent by the charging controller. If so, the calibration controller sends the calibration value corresponding to the parameters to be calibrated to the charging controller and proceeds to step 5; if not, proceeds to step 7;

[0040] Step 5: Determine whether the charge controller has received the calibration value. If so, calibrate the current gear and proceed to step 6; if not, proceed to step 7.

[0041] Step 6: Determine whether the charge controller has been calibrated. If so, the process ends; if not, the charge controller sends another gear's parameters to be calibrated to the calibration controller, and the process goes to step 4.

[0042] Step 7: The calibration between the charging controller and the calibration controller is unsuccessful, and the process ends.

[0043] The number of gears of the parameter to be calibrated ranges from 3 to 7.

[0044] Of course, when the parameter to be calibrated is a high voltage signal or a high current signal, a voltage divider circuit must be provided in the calibration system used in the calibration method, and the calibration value sent by the calibration controller to the charging controller corresponds to the parameter to be calibrated at a certain gear set in the charging controller, which is converted into a small voltage or small current value after the voltage divider circuit.

[0045] The above calibration method is described with a specific example. Assuming that the calibration signal is a high voltage signal, the voltage range of the acquisition terminal VE of the charging controller is 0-800V. In addition, assuming that the calibrated gear of the acquisition terminal VE is 5 gears, namely 0V, 200V, 400V, 600V and 800V, the ratio of the first resistor R1 to the second resistor R2 in the voltage divider circuit 1 is 399:1, that is, the theoretical AD value sampled by the sampling pin on the first MCU is VCC is the theoretical output voltage of the acquisition terminal VE. The AD values ​​corresponding to the five levels of parameters to be calibrated are: 0V, 0.5V, 1V, 1.5V and 2V. Therefore, the five levels of parameters to be calibrated set in the charging controller are converted into AD values ​​of 0V, 0.5V, 1V, 1.5V and 2V after passing through the voltage divider circuit. During calibration, it is necessary to store the corresponding calibration values ​​of these five levels of parameters to be calibrated after conversion by the voltage divider circuit in the calibration controller in advance. When calibrating a certain level of parameters to be calibrated, the DA value sent by the calibration controller is the calibration value corresponding to the level of parameters to be calibrated after conversion by the voltage divider circuit. When the charging controller receives the calibration value, it adjusts the voltage of the third pin of MCU1 to the calibration value. At this time, the voltage that the acquisition terminal VE can output is the calibrated voltage.

[0046] When the charging controller needs to calibrate the 0V voltage, it only needs to tell the calibration controller through communication that it is now calibrating the voltage of the 0V gear. When the calibration controller receives the 0V gear parameters to be calibrated, the calibration controller gives a 0V voltage signal through DA, and the calibration controller sends the 0V voltage signal to the charging controller. When the charging controller receives the 0V calibration value, the charging controller calibrates the 0V gear voltage to complete the calibration of the gear; similarly, when the charging controller sends the 200V gear parameters to be calibrated to the calibration controller, when the calibration controller receives the 200V gear parameters to be calibrated, the calibration controller gives a 0.5V voltage signal through DA, and the calibration controller sends the 0.5V voltage signal to the charging controller. When the charging controller receives the 0.5V voltage calibration value, the charging controller calibrates the 200V gear voltage. At this time, when the voltage at the third pin of the charging controller is adjusted to 0.5V, the acquisition end of the charging controller outputs a 200V voltage; the same method is used to calibrate the 400V, 600V and 800V gears in turn. The calibration of the charging pile voltage can be completed through the above steps.

[0047] On the one hand, the calibration system and calibration method mentioned above do not need to provide high voltage electricity to ensure the operation of the entire charging pile, but only need to provide a voltage that can ensure the operation of the charging controller, which improves the safety of the staff; there is no need to start the high-voltage power supply and other tedious operations during calibration, which reduces the time used for calibration; in addition, the calibration value is set to a small voltage signal through a voltage divider circuit in the calibration method to complete the calibration of the high voltage, so this method is safer and more effective. On the other hand, the calibration system does not need to install the charging controller on the charging pile for calibration. It only needs to calibrate the charging controller separately and then assemble it into a charging pile after configuring it with other equipment, which improves the production efficiency of the charging pile and reduces the problem of replacing the entire charging pile due to a malfunction of the charging controller; and the calibration controller is highly applicable and can meet the calibration of various charging controllers, and it is simple to connect and has strong versatility.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A calibration system for a charging pile, the charging pile including a charging controller, characterized in that: The calibration system includes a calibration controller for calibrating a charging controller, wherein the charging controller is provided with a first MCU, and the calibration controller is provided with a second MCU, the first MCU and the second MCU are communicatively connected, the first MCU is provided with a sampling pin, and the second MCU is provided with a calibration pin, the sampling pin on the first MCU is connected to the calibration pin on the second MCU, and the calibration signal is sent to the first MCU via the second MCU; A calibration method using the above charging pile calibration system is characterized by comprising the following steps: Step 1: Determine whether the charge controller needs to be calibrated. If so, set calibration parameters for multiple gears in the charge controller and proceed to step 2. If not, continue to determine whether the charge controller needs to be calibrated. Step 2: Determine whether the charging controller and the calibration controller have established a communication connection. If so, proceed to step 3; if not, continue to determine whether the charging controller and the calibration controller have established a communication connection. Step 3: The charging controller sends the calibration parameters of one of the gears to the calibration controller; Step 4: Determine whether the calibration controller has received the parameters to be calibrated sent by the charging controller. If so, the calibration controller sends the calibration value corresponding to the parameters to be calibrated to the charging controller and proceeds to step 5; if not, proceeds to step 7; Step 5: Determine whether the charge controller has received the calibration value. If so, calibrate the current gear and proceed to step 6; if not, proceed to step 7. Step 6: Determine whether the charge controller is calibrated. If so, the process ends. If not, the charge controller sends another gear's calibration parameters to the calibration controller, and the process goes to step 4. Step 7: The calibration between the charging controller and the calibration controller is unsuccessful, and the process ends.

2. The charging pile calibration system according to claim 1, characterized in that: The first MCU and the second MCU are respectively provided with a data sending pin and a data receiving pin. The data sending pin of the first MCU is connected to the data receiving pin of the second MCU, and the data receiving pin of the first MCU is connected to the data sending pin of the second MCU, so as to realize the communication connection between the first MCU and the second MCU.

3. The charging pile calibration system according to claim 2, characterized in that: The first MCU and the second MCU are connected to each other through an interface selected from the group consisting of UART, RS232, RS485, CAN, SPI and I2C.

4. The charging pile calibration system according to claim 1, characterized in that: The first MCU and the second MCU are respectively provided with a power supply pin and a ground pin. The power supply pin of the first MCU is connected to an external power supply (VCC), and the ground pin of the first MCU is grounded. The power supply pin on the first MCU is connected to the power supply pin of the second MCU, and the ground pin on the first MCU is connected to the ground pin of the second MCU, which is used to power the calibration controller through the charging controller.

5. The charging pile calibration system according to claim 1, characterized in that: The second pin of the first MCU outputs a reference voltage, and the second pin of the first MCU is connected to the second pin of the second MCU, so as to provide a reference voltage to the second MCU through the first MCU.

6. The charging pile calibration system according to claim 1, characterized in that: A voltage divider circuit (1) is further provided in the charging controller, one end of the voltage divider circuit (1) is grounded, the other end of the voltage divider circuit (1) corresponds to the acquisition end (VE) of the charging controller, and the middle portion of the voltage divider circuit (1) is connected to a sampling pin on the first MCU.

7. The charging pile calibration system according to claim 6, characterized in that: The voltage divider circuit (1) comprises a first resistor (R1) and a second resistor (R2) connected in series, one end of the first resistor (R1) corresponds to a collection end (VE) of a charging controller, one end of the second resistor (R2) is grounded, and a connecting line between the first resistor (R1) and the second resistor (R2) is connected to a sampling pin on a first MCU.

8. The charging pile calibration system according to claim 1, characterized in that: The calibration signal is a voltage signal or a current signal.

9. The calibration system according to claim 1, wherein: The number of gears of the parameter to be calibrated ranges from 3 to 7.

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