Circuit structure and power supply module based on CAN program control high voltage

Abstract

The utility model discloses a circuit structure and a power supply module based on CAN program control high voltage. The circuit structure comprises an STM32 single-chip microcomputer part, a CAN communication part, a flyback conversion circuit topology, an OLED display screen, a power supply part and the like. According to the utility model, based on the single-chip microcomputer controller, the flyback conversion circuit is adopted to convert power supply voltage and simulate pack high-voltage signals, the CAN communication control circuit is adopted to carry out high-voltage signal program control, and the OLED is adopted to display the voltage value and the current value of the current high-voltage signals in real time. The device has the advantages of being small in size and low in cost, completely replaces a heavy and expensive high-power high-voltage power supply in function, and is suitable for being used in lithium battery and BMS testing occasions.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage power supply technology for lithium batteries and BMS testing, and in particular to a circuit structure and power supply module based on CAN programmable high voltage. Background Technology

[0002] With the increasing popularity of new energy vehicles and lithium battery products, there is a growing need for lower-cost and smaller high-voltage power modules to meet the high-voltage simulation function of lithium battery products.

[0003] For example, utility model application No. 202010138269.1 discloses a BMS board testing device, testing system, and testing method. This utility model uses a circuit module to simulate the voltage output and operating state of a lithium battery to replace the lithium battery required for testing. This allows for BMS board testing without relying on a lithium battery, thereby shortening the testing cycle, improving testing efficiency, and ensuring testing safety. However, this solution does not disclose the structure of the power module used.

[0004] For example, utility model application No. 202311323679.3 discloses an integrated BMS board testing device and system. While its solution solves the problem of fast, accurate, and reliable connection during online testing in the mass production process of BMS boards and reduces production costs, it does not miniaturize the power module. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this utility model is to provide a circuit structure and power module based on CAN programmable high voltage, which is low-cost to manufacture, small in size, and meets the high-voltage simulation function of lithium battery products.

[0006] The purpose of this utility model can be achieved through the following technical solution: a circuit structure and power supply module based on CAN programmable high voltage, based on a microcontroller controller, using a flyback converter circuit to transform the power supply voltage, simulating a pack high voltage signal, using a CAN communication control circuit to perform high voltage signal programmable control, and using an OLED to display the current voltage and current values ​​of the high voltage signal in real time.

[0007] Furthermore, the microcontroller controller adopts the STM32 model and includes IIC, SPI, and CAN peripheral interfaces, providing strong expansion capabilities.

[0008] Furthermore, the CAN communication control circuit, DC1, adopts a bidirectional TVS diode design, which provides good electrostatic protection and stable communication functionality.

[0009] Furthermore, the CAN communication control circuit structure is as follows:

[0010] UC1's 8th port is grounded, UC1's 7th port is connected to the CAN H terminal, one end of RC1, and DC1's 1st port, UC1's 6th port is connected to the CAN L terminal, the other end of RC1, and DC1's 2nd port, and DC1's 3rd port is connected to GND3.

[0011] UC1's port 1 is connected to U1's port 14; UC1's port 2 is connected to one end of CC2, one end of CC1, and GND3; UC1's port 3 is connected to the other end of CC2, the other end of CC1, and 5V; UC1's port 4 is connected to U1's port 10.

[0012] U1's port 16 is connected to one end of C4, one end of C5, and port 9. U1's port 15 is connected to the other end of C4, the other end of C5, and GND3. U1's port 3 is connected to CANTX DZ60. U1's port 6 is connected to CANRX DZ60. U1's ports 7 and 1 are connected to one end of C6, 3.3V, and one end of C7. U1's port 2 is connected to the other end of C6, GND, and the other end of C7.

[0013] The CAN communication control circuit uses the SN65HVD230 chip, which supports all CAN rates. Combined with the bidirectional TVS diode design, it has good electrostatic protection and stable communication functions.

[0014] Furthermore, the flyback converter circuit uses a multi-group secondary-side series boost method for the switching transformer to achieve isolated voltage boosting, and uses optocoupler isolation for switching drive.

[0015] Furthermore, the flyback converter circuit structure is as follows:

[0016] Connect one end of T1 to F1. Connect the other end of F1 to one end of R5, one end of C14, one end of C21 and 48V. Connect the other end of C21 to HGND. Connect the other end of C14 to the other end of R5, one end of R7 and one end of R8. Connect the other end of R7 to the other end of R8 and one end of D1. Connect the other end of D1 to the second end of T1 and the second end of Q1.

[0017] Connect pin 1 of Q1 to one end of R18, one end of R20, and one end of TR6. Connect pin 3 of Q1 to one end of R21. Connect the other end of R21 to HGND, the other end of R20, and one end of R24. Connect the other end of R18 to the other end of TR6, the other end of R24, and pin 3 of PC817. Connect pin 4 of PC817 to 24V+. Connect pin 1 of PC817 to one end of R26. Connect the other end of R26 to VIN. Connect pin 2 of PC817 to pin 3 of T2. Connect pin 2 of T2 to GND. Connect pin 1 of T2 to the PWM signal.

[0018] TR4 is connected in series with TR5, TR1, TR2 and TR3 to output 750V. The 750V is connected to port 1 of J1 and connected in series with R6, R10, R12, R15, R16, R17 and R23 to GND. R17 and R23 are connected to one end of R19 and ADC1 for sampling. The other end of R19 is connected to one end of C30 and the other end of C30 is connected to GND.

[0019] J1's port 2 is connected to one end of R4, one end of C17, and port 3 of U5. The other end of R4 is connected to GND, the other end of C17 is connected to port 4 of U5, and port 5 of U5 is connected to one end of C25 and VIN. The other end of C25 is connected to GND, and port 2 of U5 is connected to GND. U5's port 1 is connected to one end of R14 and one end of R13. The other end of R14 is connected to GND, and the other end of R13 is connected to ADC2 sampling and one end of C23. The other end of C23 is connected to GND.

[0020] Using the above structure, a high-voltage pack signal is simulated to realize the high-voltage signal programmable control function. The switching transformer adopts a multi-group secondary side series boost method to realize voltage isolation boost, and an optocoupler isolation method is used for switching drive.

[0021] Furthermore, the OLED uses an IIC interface to communicate with a microcontroller and displays information such as high voltage and current on the screen.

[0022] Furthermore, it also includes isolated power supply one and isolated power supply two, which convert 12V into isolated 5V voltage.

[0023] Furthermore, the isolated power supply circuit structure is as follows:

[0024] Connect WRA1's pin 2 to one end of C31, 12V+, and P5's pin 1. Connect P5's pin 2 to HGND. Connect the other end of C31 to HGND. Connect WRA's pin 1 to HGND. Connect WRA's pin 6 to VIN and one end of C32. Connect the other end of C32 to GND. Connect WRA's pin 8 to one end of C33. Connect the other end of C33 to pin 7.

[0025] The isolation power supply circuit structure is as follows:

[0026] Connect one end of C1 and 12V+ to port 2 of WRA2. Connect the other end of C1 to HGND and port 1 of WRA1. Connect port 6 of WRA1 to 5V and one end of C2. Connect port 7 of WRA1 to GND3 and one end of C3. Connect port 8 of WRA1 to the other end of C3.

[0027] Using the above structure, isolation power supply one and isolation power supply two convert 12V into an isolated 5V voltage for use by the downstream circuit.

[0028] A power supply module based on CAN programmable high voltage, wherein the power supply module adopts the above-mentioned circuit structure; the volume of the power supply module can be reduced to no more than 100mm*80mm in length and width and less than 50mm in height, which has the characteristics of small size and low cost, and can meet the high voltage simulation function of lithium battery products.

[0029] The beneficial effects of this utility model are:

[0030] 1. The circuit structure of this utility model adopts an STM32 microcontroller controller, uses a flyback converter circuit topology, has CAN communication control, has PACK high voltage simulation and high voltage programmable control functions, and uses an OLED display to display the current high voltage and current values ​​in real time. It is small in size, low in cost, and completely replaces bulky and expensive high-power high voltage power supplies, making it extremely suitable for lithium battery and BMS testing applications.

[0031] 2. The power module of this utility model has a circuit structure that can reduce the module size to no more than 100mm*80mm in length and width and less than 50mm in height. It has the characteristics of small size and low cost, and can meet the high voltage simulation requirements of various types of lithium battery products. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the circuit structure of the present invention based on CAN programmable high voltage;

[0033] Figure 2 This is a schematic diagram of the STM32 interface structure of this utility model;

[0034] Figure 3 This is a schematic diagram of the CAN communication control circuit structure of this utility model;

[0035] Figure 4 This is a schematic diagram of the flyback converter circuit structure of this utility model;

[0036] Figure 5 This is a schematic diagram of the circuit structure of the isolation power supply of this utility model;

[0037] Figure 6 This is a schematic diagram of the two-circuit structure of the isolated power supply of this utility model. Detailed Implementation

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0039] like Figure 1As shown, this utility model discloses a circuit structure and power supply module based on CAN-controlled high voltage. Based on a microcontroller, it uses a flyback converter circuit to transform the power supply voltage, simulating a high-voltage signal. A CAN communication control circuit is used for programmable control of the high-voltage signal. An OLED displays the current voltage and current values ​​of the high-voltage signal in real time. Figure 2 As shown, the microcontroller controller can be an STM32 microcontroller, which includes various peripheral interfaces such as IIC, SPI, and CAN. For example, the STM32F103C8T6 microcontroller chip has multiple peripheral interfaces such as IIC, SPI, and CAN.

[0040] The entire circuit structure is small in size and low in cost, and can completely replace bulky and expensive high-power high-voltage power supplies, making it extremely suitable for lithium battery and BMS testing applications.

[0041] like Figure 1 As shown, the circuit structure mainly consists of the following functional parts: STM32 microcontroller, CAN communication, flyback converter circuit topology, OLED screen display, and power supply.

[0042] like Figure 3 As shown, the CAN communication control circuit can use the SN65HVD230 chip as UC1 and the SI8641ED-B-ISR chip as U1. The SN65HVD230 chip supports all CAN communication rates, and DC1 uses a bidirectional TVS diode, which has good electrostatic protection and stable communication function.

[0043] UC1's 8th port is grounded, UC1's 7th port is connected to the CAN H terminal, one end of RC1, and DC1's 1st port, UC1's 6th port is connected to the CAN L terminal, the other end of RC1, and DC1's 2nd port, and DC1's 3rd port is connected to GND3.

[0044] UC1's port 1 is connected to U1's port 14; UC1's port 2 is connected to one end of CC2, one end of CC1, and GND3; UC1's port 3 is connected to the other end of CC2, the other end of CC1, and 5V; UC1's port 4 is connected to U1's port 10.

[0045] U1's port 16 is connected to one end of C4, one end of C5, and port 9. U1's port 15 is connected to the other end of C4, the other end of C5, and GND3. U1's port 3 is connected to CANTX DZ60. U1's port 6 is connected to CANRX DZ60. U1's ports 7 and 1 are connected to one end of C6, 3.3V, and one end of C7. U1's port 2 is connected to the other end of C6, GND, and the other end of C7.

[0046] The CAN communication control circuit supports all CAN rates and, with the addition of a bidirectional TVS diode, provides excellent electrostatic protection and stable communication capabilities.

[0047] Furthermore, the flyback converter circuit uses a multi-group secondary-side series boost method for the switching transformer to achieve voltage isolation boost, and uses optocoupler isolation for switching drive.

[0048] like Figure 1 As shown, the flyback converter circuit includes a MOS drive control section, a high-voltage transformer section, and a voltage and current acquisition section. The high-voltage transformer section is used for high-voltage signal programmable control, and the high-voltage transformer module realizes multiple sets of secondary windings in series to boost the voltage and obtain simulated high voltage. The voltage and current acquisition module collects voltage and current information for OLED display.

[0049] Specifically, such as Figure 4 As shown, the flyback converter circuit structure is as follows:

[0050] Connect one end of T1 to F1. Connect the other end of F1 to one end of R5, one end of C14, one end of C21 and 48V. Connect the other end of C21 to HGND. Connect the other end of C14 to the other end of R5, one end of R7 and one end of R8. Connect the other end of R7 to the other end of R8 and one end of D1. Connect the other end of D1 to the second end of T1 and the second end of Q1.

[0051] Connect pin 1 of Q1 to one end of R18, one end of R20, and one end of TR6. Connect pin 3 of Q1 to one end of R21. Connect the other end of R21 to HGND, the other end of R20, and one end of R24. Connect the other end of R18 to the other end of TR6, the other end of R24, and pin 3 of PC817. Connect pin 4 of PC817 to 24V+. Connect pin 1 of PC817 to one end of R26. Connect the other end of R26 to VIN. Connect pin 2 of PC817 to pin 3 of T2. Connect pin 2 of T2 to GND. Connect pin 1 of T2 to the PWM signal.

[0052] TR4 is connected in series with TR5, TR1, TR2 and TR3 to output 750V. The 750V is connected to port 1 of J1 and connected in series with R6, R10, R12, R15, R16, R17 and R23 to GND. R17 and R23 are connected to one end of R19 and ADC1 for sampling. The other end of R19 is connected to one end of C30 and the other end of C30 is connected to GND.

[0053] J1's port 2 is connected to one end of R4, one end of C17, and port 3 of U5. The other end of R4 is connected to GND, the other end of C17 is connected to port 4 of U5, and port 5 of U5 is connected to one end of C25 and VIN. The other end of C25 is connected to GND, and port 2 of U5 is connected to GND. U5's port 1 is connected to one end of R14 and one end of R13. The other end of R14 is connected to GND, and the other end of R13 is connected to ADC2 sampling and one end of C23. The other end of C23 is connected to GND.

[0054] Using the above structure, a high-voltage pack signal is simulated to realize the high-voltage signal programmable control function. The switching transformer adopts a multi-group secondary side series boost method to realize voltage isolation boost, and an optocoupler isolation method is used for switching drive.

[0055] Furthermore, the OLED uses a 0.96-inch screen and communicates with the microcontroller via the IIC interface to display information such as high voltage and current on the screen. The OLED display can show the current high voltage and current values ​​in real time.

[0056] Furthermore, the circuit also includes isolated power supply one and isolated power supply two, both of which use WRA2405CKS (WRA) modules to convert 12V into isolated 5V voltage for use by the downstream circuit.

[0057] Among them, such as Figure 5 As shown, the circuit structure of the isolated power supply is as follows: pin 2 of WRA1 is connected to one end of C31, 12V+ and pin 1 of P5, pin 2 of P5 is connected to HGND, the other end of C31 is connected to HGND, pin 1 of WRA is connected to HGND, pin 6 of WRA is connected to VIN and one end of C32, the other end of C32 is connected to GND, pin 8 of WRA is connected to one end of C33, and the other end of C33 is connected to pin 7.

[0058] like Figure 6 As shown, the circuit structure of the isolated power supply is as follows: the second port of WRA2 is connected to one end of C1 and 12V+, the other end of C1 is connected to HGND and the first port of WRA1, the sixth port of WRA1 is connected to 5V and one end of C2, the seventh port of WRA1 is connected to GND3 and one end of C3, and the eighth port of WRA1 is connected to the other end of C3.

[0059] The circuit structure of this utility model adopts an STM32F103C8T6 microcontroller, a flyback converter circuit topology, and CAN communication control. It has PACK high voltage simulation and high voltage programmable control functions. It uses an OLED display to display the current high voltage and current values ​​in real time. It is small in size, low in cost, and completely replaces bulky and expensive high-power high voltage power supplies. It is extremely suitable for lithium battery and BMS testing applications.

[0060] The power module using the circuit structure of this utility model can be reduced in size to no more than 100mm*80mm in length and width and less than 50mm in height. It has the characteristics of small size and low cost, and can meet the high voltage simulation function of lithium battery products.

[0061] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and concept of the present utility model, should be included within the protection scope of the present utility model.

[0062] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

Claims

1. A circuit structure based on CAN programmable high voltage, characterized in that, Based on a microcontroller, a flyback converter circuit is used to transform the power supply voltage to simulate a high-voltage signal. A CAN communication control circuit is used for programmable control of the high-voltage signal, and an OLED displays the current voltage and current values ​​of the high-voltage signal in real time.

2. The circuit structure according to claim 1, characterized in that, The microcontroller controller is an STM32 type, including IIC, SPI and CAN peripheral interfaces.

3. The circuit structure according to claim 1, characterized in that, The CAN communication control circuit adopts a bidirectional TVS diode design.

4. The circuit structure according to claim 3, characterized in that, The CAN communication control circuit structure is as follows: UC1's 8th port is grounded, UC1's 7th port is connected to the CAN H terminal, one end of RC1, and DC1's 1st port, UC1's 6th port is connected to the CAN L terminal, the other end of RC1, and DC1's 2nd port, and DC1's 3rd port is connected to GND3. UC1's port 1 is connected to U1's port 14; UC1's port 2 is connected to one end of CC2, one end of CC1, and GND3; UC1's port 3 is connected to the other end of CC2, the other end of CC1, and 5V; UC1's port 4 is connected to U1's port 10. U1's port 16 is connected to one end of C4, one end of C5, and port 9. U1's port 15 is connected to the other end of C4, the other end of C5, and GND3. U1's port 3 is connected to CANTX DZ60. U1's port 6 is connected to CANRX DZ60. U1's ports 7 and 1 are connected to one end of C6, 3.3V, and one end of C7. U1's port 2 is connected to the other end of C6, GND, and the other end of C7.

5. The circuit structure according to claim 1, characterized in that, The flyback converter circuit uses a multi-group secondary-side series boost method for the switching transformer to achieve isolated voltage boosting, and uses optocoupler isolation for switching drive.

6. The circuit structure according to claim 5, characterized in that, The flyback converter circuit structure is as follows: Connect one end of T1 to F1. Connect the other end of F1 to one end of R5, one end of C14, one end of C21 and 48V. Connect the other end of C21 to HGND. Connect the other end of C14 to the other end of R5, one end of R7 and one end of R8. Connect the other end of R7 to the other end of R8 and one end of D1. Connect the other end of D1 to the second end of T1 and the second end of Q1. Connect pin 1 of Q1 to one end of R18, one end of R20, and one end of TR6. Connect pin 3 of Q1 to one end of R21. Connect the other end of R21 to HGND, the other end of R20, and one end of R24. Connect the other end of R18 to the other end of TR6, the other end of R24, and pin 3 of PC817. Connect pin 4 of PC817 to 24V+. Connect pin 1 of PC817 to one end of R26. Connect the other end of R26 to VIN. Connect pin 2 of PC817 to pin 3 of T2. Connect pin 2 of T2 to GND. Connect pin 1 of T2 to the PWM signal. TR4 is connected in series with TR5, TR1, TR2 and TR3 to output 750V. The 750V is connected to port 1 of J1 and connected in series with R6, R10, R12, R15, R16, R17 and R23 to GND. R17 and R23 are connected to one end of R19 and ADC1 for sampling. The other end of R19 is connected to one end of C30 and the other end of C30 is connected to GND. J1's port 2 is connected to one end of R4, one end of C17, and port 3 of U5. The other end of R4 is connected to GND, the other end of C17 is connected to port 4 of U5, and port 5 of U5 is connected to one end of C25 and VIN. The other end of C25 is connected to GND, and port 2 of U5 is connected to GND. U5's port 1 is connected to one end of R14 and one end of R13. The other end of R14 is connected to GND, and the other end of R13 is connected to ADC2 sampling and one end of C23. The other end of C23 is connected to GND.

7. The circuit structure according to claim 1, characterized in that, The OLED uses an IIC interface to communicate with a microcontroller and displays information such as high voltage and current on the screen.

8. The circuit structure according to claim 1, characterized in that, It also includes isolated power supply one and isolated power supply two, which convert 12V into isolated 5V voltage.

9. The circuit structure according to claim 8, characterized in that, The circuit structure of the isolation power supply is as follows: Connect WRA1's pin 2 to one end of C31, 12V+, and P5's pin 1. Connect P5's pin 2 to HGND. Connect the other end of C31 to HGND. Connect WRA's pin 1 to HGND. Connect WRA's pin 6 to VIN and one end of C32. Connect the other end of C32 to GND. Connect WRA's pin 8 to one end of C33. Connect the other end of C33 to pin 7. The isolation power supply circuit structure is as follows: Connect one end of C1 and 12V+ to port 2 of WRA2. Connect the other end of C1 to HGND and port 1 of WRA1. Connect port 6 of WRA1 to 5V and one end of C2. Connect port 7 of WRA1 to GND3 and one end of C3. Connect port 8 of WRA1 to the other end of C3.

10. A power supply module based on CAN programmable high voltage, characterized in that, The power module adopts the circuit structure described in any one of claims 1 to 9.

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