Power supply circuit of MCU off-line burning system
By designing the power circuit of the MCU offline recording system, including the system power conversion module, the MCU power conversion module and the anti-return module, the problem of the multi-power supply MCU offline recording cannot be automated, and the MCU offline recording is realized The normal work and burning requirements during the process ensure the smooth progress of the burning process.
Patent Information
- Application Number
- CN202421021722.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-05-11
AI Technical Summary
In a multi-powered MCU, the offline burning process cannot be automated, and the program cannot be burned from the outside to the internal memory, resulting in the inability to realize the automated burning process.
A power circuit for an MCU offline recording system is designed, including a system power conversion module, a MCU power conversion module and an anti-return module. By converting the vehicle terminal power voltage into the first and second power voltages that meet the normal operation of the MCU, And use the same burning power supply voltage when burning offline to prevent the burning power supply voltage from pouring back to the input voltage and prevent the MCU from working normally during the offline burning process.
It realizes the normal working and burning requirements during the offline recording of the MCU, avoids the MCU starting the protection program when it is offline burned, ensures the smooth progress of the burning process, and solves the offline burning of the MCU with multi-power supply. Problem of inability to automate.
Smart Images
Figure CN222356209U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of burning control of an EVCC (Electric Vehicle Communication Controller), in particular to a power supply circuit of an MCU offline burning system. Background Art
[0002] Before the EVCC (Electric Vehicle Communication Controller) leaves the factory, it will be programmed with certain specific data so that the specific data can be recorded in the internal memory through the above-mentioned programming. As the functions of the EVCC increase, the power supply for the MCU inside it has gradually changed from a single power supply to multiple power supplies. Since the MCU will start the protection program for the internal memory when it is powered normally, it can only read the program in the internal memory for normal operation, and cannot burn the program from the outside to the internal memory. Therefore, a power supply circuit is needed that can meet the power supply requirements of the normal operation of the MCU and the offline programming process of the MCU, so as to solve the problem that the offline programming production line of the MCU powered by multiple power supplies cannot be automated. Utility Model Content
[0003] In view of the above problems in the prior art, the purpose of the present disclosure is to provide a power supply circuit of an MCU offline burning system, comprising:
[0004] A system power conversion module, an MCU power conversion module, an MCU and a burning device, wherein the output end of the system power conversion module is connected to the input end of the MCU power conversion module, and is used to convert the vehicle-side power supply voltage into the system voltage to power the MCU power conversion module; the output end of the MCU power conversion module is connected to the input end of the MCU, and is used to convert the system voltage into a first power supply voltage and a second power supply voltage that meet the normal working power supply conditions of the MCU, wherein the first power supply voltage is greater than the second power supply voltage; the burning device is electrically connected to the MCU, and the burning device is configured to operate with a burning power supply voltage that is the same as the first power supply voltage when performing offline burning; an anti-backflow module is provided in the MCU power conversion module, and is used to prevent the burning power supply voltage from backflowing into a power supply system whose input voltage is the system voltage, thereby preventing the MCU from working normally during the offline burning process.
[0005] Preferably, the system power conversion module includes a 12V to 5V chip for converting the 12V vehicle-side power supply voltage into the 5V system voltage, and the 12V to 5V chip uses a power management chip model MPQ9840GL.
[0006] Preferably, the MCU power conversion module includes a first conversion module, the input end of the first conversion module is connected to the output end of the system power conversion module, and the output end of the first conversion module is connected to the input end of the MCU, for converting the system voltage into the first power supply voltage to power the MCU port.
[0007] Preferably, the MCU power conversion module includes a second conversion module, the input end of the second conversion module is connected to the output end of the system power conversion module, and the output end of the second conversion module is connected to the input end of the MCU, for converting the system voltage into the second power supply voltage to power the MCU core.
[0008] Preferably, the first conversion module includes a 5V to 3.3V chip for converting the system voltage of 5V into the first power supply voltage of 3.3V, and the 5V to 3.3V chip is a low-power linear conversion chip with model number MPQ2019GLN.
[0009] Preferably, the second conversion module comprises a 5V to 0.8V chip for converting the system voltage of 5V into the second power supply voltage of 0.8V, and the 5V to 0.8V chip is a power switch conversion chip of model MPQ2172GJ.
[0010] Preferably, the backflow prevention module is arranged in the first conversion module, and the backflow prevention module comprises a diode, an anode of the diode is connected to the system voltage, and a cathode of the diode is connected to the power supply voltage input terminal of the 5V to 3.3V chip.
[0011] Preferably, the burning device comprises an FCT burning tool and a Flash chip, and the FCT burning tool is electrically connected to the MCU via a power interface of the Flash chip.
[0012] Preferably, a burner is provided in the FCT burning tool, and the burner, the system power conversion module, the MCU power conversion module and the MCU are all integrated on a control circuit board.
[0013] Preferably, the MCU is an electric vehicle communication controller unit.
[0014] According to the power supply circuit of the MCU offline burning system disclosed in the present invention, by setting an anti-backflow module in the first conversion module, it is possible to prevent the burning power supply voltage from backflowing into the power supply system whose input voltage is the system voltage, thereby preventing the MCU from working normally during the offline burning process and ensuring that the offline burning process proceeds smoothly. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0016] Figure 1 The structure block diagram of the power supply circuit of the MCU offline burning system of the preferred embodiment of the present disclosure is shown.
[0017] Figure 2 for Figure 1 Circuit schematic diagram of the system power conversion module in .
[0018] Figure 3 for Figure 1 Schematic diagram of the circuit of the first conversion module.
[0019] Figure 4 for Figure 1 Schematic diagram of the circuit of the second conversion module. DETAILED DESCRIPTION
[0020] The preferred embodiments of the present disclosure are described below in conjunction with the drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure. In addition, the embodiments and features in the embodiments of the present disclosure may be combined with each other if no conflict occurs.
[0021] like Figure 1 As shown, the present disclosure provides a power supply circuit of an MCU offline burning system of a preferred embodiment, including: a system power conversion module, an MCU power conversion module, an MCU and a burning device, wherein the output end of the system power conversion module is connected to the input end of the MCU power conversion module, and is used to convert the vehicle-side power supply voltage into a system voltage to power the MCU power conversion module, the output end of the MCU power conversion module is connected to the input end of the MCU, and is used to convert the system voltage into a first power supply voltage and a second power supply voltage that meet the normal working power supply conditions of the MCU, the first power supply voltage is greater than the second power supply voltage, the burning device is electrically connected to the MCU, and the burning device is configured to use a burning power supply voltage that is the same as the first power supply voltage to work during offline burning, and an anti-backflow module is provided in the MCU power conversion module, which is used to prevent the burning power supply voltage from backflowing into a power supply system whose input voltage is the system voltage, thereby preventing the MCU from working normally during offline burning.
[0022] It can be understood that since the protection program will be started for the internal memory when the MCU is powered normally, it can only read the program in the internal memory to perform normal work, and it is impossible to burn the program from the outside into the internal memory. Therefore, when performing offline burning, it is necessary to avoid the normal operation of the MCU and start the protection program for the internal memory, thereby ensuring the normal progress of offline burning.
[0023] By utilizing the power supply circuit disclosed in the present invention, which can satisfy both the power supply requirements of the normal operation of the MCU and the offline burning process of the MCU, the problem that the offline burning production line of the MCU powered by multiple power supplies cannot be automated can be solved.
[0024] like Figure 1 and Figure 2 As shown, the system power conversion module includes a 12V to 5V chip U1, which is used to convert the 12V vehicle-side power voltage into a 5V system voltage. The 12V to 5V chip U1 uses a power management chip model MPQ9840GL.
[0025] like Figure 1 As shown, the MCU power conversion module includes a first conversion module, the input end of the first conversion module is connected to the output end of the system power conversion module, and the output end of the first conversion module is connected to the input end of the MCU, and is used to convert the system voltage into a first power supply voltage to power the MCU port.
[0026] Specifically, Figure 3 As shown, the first conversion module includes a 5V to 3.3V chip U2, which is used to convert the 5V system voltage into a first power supply voltage of 3.3V. The 5V to 3.3V chip U2 adopts a low-power linear conversion chip with model number MPQ2019GLN.
[0027] like Figure 1 As shown, the MCU power conversion module includes a second conversion module, the input end of the second conversion module is connected to the output end of the system power conversion module, and the output end of the second conversion module is connected to the input end of the MCU, and is used to convert the system voltage into a second power supply voltage to power the MCU core.
[0028] Specifically, Figure 4 As shown, the second conversion module includes a 5V to 0.8V chip U5, which is used to convert the 5V system voltage into a 0.8V second power supply voltage. The 5V to 0.8V chip U5 uses a power switch conversion chip with a model number of MPQ2172GJ.
[0029] In this embodiment, if Figure 3 As shown, the backflow prevention module is arranged in the first conversion module, and the backflow prevention module includes a diode, the anode of the diode is connected to the system voltage, and the cathode of the diode is connected to the power supply voltage input terminal of the 5V to 3.3V chip U2.
[0030] In this embodiment, if Figure 1 As shown, the burning device includes an FCT burning tool and a Flash chip, and the FCT burning tool is electrically connected to the MCU through the power interface of the Flash chip. Preferably, the MCU is an electric vehicle communication controller unit.
[0031] In this embodiment, a burner is provided in the FCT burning tool, and the burner, the system power conversion module, the MCU power conversion module, and the MCU are all integrated on a control circuit board.
[0032] Working principle:
[0033] like Figure 2 As shown, after the circuit is powered on, the vehicle end provides a 30F voltage, which is input to the VIN pin of the 12V to 5V chip U1. The EN pin of the 12V to 5V chip U1 receives the INH_EN signal of the external wake-up chip, which is a high-level signal. At this time, the EN pin voltage is a high-level signal, which meets the working conditions of the 12V to 5V chip U1. The 5V system voltage is output through the combination of the inductor L3 and the two feedback resistors (R7, R20). The SYNC pin of the 12V to 5V chip U1 is connected to the VCC pin through the resistor R16, so that the 12V to 5V chip U1 works in FCCM mode to ensure a stable system voltage of 5V / 3.5A.
[0034] like Figure 3 As shown, the VIN pin of the 5V to 3.3V chip U2 is connected to the system voltage 5V network, and its EN pin is connected to its IN pin through a resistor R8. The other end is grounded through a resistor R19 to form a voltage divider resistor. At this time, when there is a 5V voltage in the system voltage 5V network, the 5V voltage is input to the IN pin through a diode D27. At this time, the EN pin of the 5V to 3.3V chip U2 obtains a voltage of about 2.5V through resistor voltage division, which meets the working conditions of the 5V to 3.3V chip U2, and outputs a first power supply voltage of 3.3V to provide to the MCU.
[0035] like Figure 4 As shown, the VIN pin of the 5V to 0.8V chip U5 is connected to the system voltage 5V network, and its EN pin is connected to the system voltage 5V network through a resistor R39, and the other end is grounded through a resistor R57. At this time, when there is a 5V voltage in the system voltage 5V network, the voltage of the EN pin is 2.5V, which meets the working conditions of the 5V to 0.8V chip U5, and a second power supply voltage of 0.8V can be generated through the combination of the inductor L6, the resistor R52 and the resistor R59 feedback voltage to provide to the MCU.
[0036] From the principles of the above chips, we can know that after the connector supplies 30F voltage, 5V voltage will be generated through the 12V to 5V chip U1. After generating 5V voltage, 3.3V and 0.8V voltages will be generated through the 5V to 3.3V chip U2 and the 5V to 0.8V chip U5. At this time, the MCU meets the 0.8V and 3.3V voltage power supply requirements and will start working.
[0037] After the MCU starts working, the Flash chip will enter the protection state. At this time, the MCU can only read the program from it for normal operation, and the FCT burning tool cannot burn the program into the Flash chip. When the FCT burning tool performs offline burning, the tool itself does not supply power, and only connects to the 3.3V voltage test point on the control circuit board through the burner probe in the tool to provide 3.3V voltage (the first power supply voltage in the normal working power supply condition of the MCU has been met). Therefore, it is necessary to set a diode D27 to prevent backflow at the input end of the 5V to 3.3V chip U2. At this time, the 3.3V voltage can be supplied to the Flash chip for operation, and the diode D27 in the first conversion module can prevent the 3.3V voltage provided by the FCT burning tool from being backflowed into the power supply system of the 5V system voltage. It can be understood that if the voltage is backflowed, it is about 2.7V, and the 2.7V voltage is also sufficient to generate a 0.8V voltage through the second conversion module. Then the MCU meets the normal working power supply condition at this time and is in a normal working state, which will prevent the normal progress of the burning program. Therefore, the diode D27 is provided to prevent the second conversion module from generating a voltage of 0.8V, thereby preventing the MCU from working normally, and further completing the normal burning of the Flash chip.
[0038] Although the preferred embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present disclosure.
[0039] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present disclosure without departing from the spirit and scope of the embodiments of the present disclosure. Thus, if these modifications and variations of the embodiments of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to include these modifications and variations.
[0040] It should also be understood that in the embodiments of this document, the term "and / or" is only a description of the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects before and after are in an "or" relationship.
[0041] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this article.
[0042] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.
[0043] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of this article.
[0044] In addition, each functional unit in each embodiment of this invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional unit.
[0045] Specific embodiments are used in this article to illustrate the principles and implementation methods of this article. The description of the above embodiments is only used to help understand the methods and core ideas of this article. At the same time, for general technicians in this field, according to the ideas of this article, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on this article.
Claims
1. A power supply circuit of an MCU offline burning system, characterized in that: The invention comprises a system power conversion module, an MCU power conversion module, an MCU and a burning device, wherein the output end of the system power conversion module is connected to the input end of the MCU power conversion module, and is used to convert the vehicle-side power supply voltage into the system voltage to supply power to the MCU power conversion module; the output end of the MCU power conversion module is connected to the input end of the MCU, and is used to convert the system voltage into a first power supply voltage and a second power supply voltage that meet the normal working power supply conditions of the MCU, wherein the first power supply voltage is greater than the second power supply voltage; the burning device is electrically connected to the MCU, and is configured to operate with a burning power supply voltage that is the same as the first power supply voltage when performing offline burning; an anti-backflow module is provided in the MCU power conversion module, and is used to prevent the burning power supply voltage from backflowing into a power supply system whose input voltage is the system voltage, thereby preventing the MCU from working normally during the offline burning process.
2. The power supply circuit of the MCU offline burning system according to claim 1, characterized in that: The system power conversion module includes a 12V to 5V chip, which is used to convert the 12V vehicle-side power supply voltage into the 5V system voltage. The 12V to 5V chip uses a power management chip with model number MPQ9840GL.
3. The power supply circuit of the MCU offline burning system according to claim 2, characterized in that: The MCU power conversion module includes a first conversion module, the input end of the first conversion module is connected to the output end of the system power conversion module, and the output end of the first conversion module is connected to the input end of the MCU, and is used to convert the system voltage into the first power supply voltage to power the MCU port.
4. The power supply circuit of the MCU offline burning system according to claim 2, characterized in that: The MCU power conversion module includes a second conversion module, the input end of the second conversion module is connected to the output end of the system power conversion module, and the output end of the second conversion module is connected to the input end of the MCU, and is used to convert the system voltage into the second power supply voltage to power the MCU core.
5. The power supply circuit of the MCU offline burning system according to claim 3, characterized in that: The first conversion module includes a 5V to 3.3V chip, which is used to convert the system voltage of 5V into the first power supply voltage of 3.3V. The 5V to 3.3V chip adopts a low-power linear conversion chip with model number MPQ2019GLN.
6. The power supply circuit of the MCU offline burning system according to claim 4, characterized in that: The second conversion module includes a 5V to 0.8V chip, which is used to convert the system voltage of 5V into the second power supply voltage of 0.8V. The 5V to 0.8V chip is a power switch conversion chip with a model number of MPQ2172GJ.
7. The power supply circuit of the MCU offline burning system according to claim 5, characterized in that: The anti-backflow module is arranged in the first conversion module, and the anti-backflow module comprises a diode, an anode of the diode is connected to the system voltage, and a cathode of the diode is connected to the power supply voltage input terminal of the 5V to 3.3V chip.
8. The power supply circuit of the MCU offline burning system according to claim 1, characterized in that: The burning device comprises an FCT burning tool and a Flash chip, and the FCT burning tool is electrically connected to the MCU via a power interface of the Flash chip.
9. The power supply circuit of the MCU offline burning system according to claim 8, characterized in that: The FCT burning tool is provided with a burner, and the burner, the system power conversion module, the MCU power conversion module, and the MCU are all integrated on a control circuit board.
10. The power supply circuit of the MCU offline burning system according to claim 1, characterized in that: The MCU is an electric vehicle communication controller unit.