A low-power control system for online upgrading of a high-voltage DCDC power supply

Abstract

The utility model discloses a kind of low-power control systems of high-voltage DCDC power supply online upgrading, it is related to automobile high-voltage power management technical field, including main control chip and monitoring circuit, monitoring circuit includes the current sensor and comparator connected with main control chip, main control chip connection is set in the low-power monitoring unit of memory, dynamic clock module, voltage monitoring module, encryption engine module, low-power monitoring unit connects comparator, for standby hierarchical wake-up, dynamic clock module, for switching HSE clock source or LSI clock source, voltage monitoring module connects the current sensor, using voltage self-adapting brush write strategy carries out synchronous detection to 800V bus, 12V output and 3.3V MCU voltage, forms triple voltage detection.The utility model can effectively reduce standby power consumption, effectively improve the success rate of high-voltage DCDC power supply online upgrading, make online upgrading more reliable and safe.

Description

Technical Field

[0001] This utility model belongs to the field of automotive high-voltage power management technology, specifically relating to a low-power control system for online upgrading of high-voltage DC-DC power supplies. Background Technology

[0002] In the management of high-voltage power supplies for new energy vehicles, the following shortcomings exist: 1. Insufficient power consumption control: Traditional bootloaders consume 3-5mA of current in standby mode, leading to low-voltage battery depletion. Continuous polling of the CAN bus keeps the MCU in RUN mode for extended periods, violating the static current requirements of ISO 16750-2. 2. Upgrade reliability issues: High-voltage bus fluctuations (±50V) cause 30% of Flash write errors. Immediate write mode cannot handle instantaneous drops in the 12V low-voltage side (failure occurs if <6V lasts for 10ms). 3. Real-time performance contradictions: ES-256 encryption takes 15ms / KB, exceeding the 10ms response time limit specified by the UDS protocol. While the traditional RC4 algorithm is fast, it has weak key vulnerabilities. Therefore, our company has designed and proposed a low-power control system for online upgrades of high-voltage DC-DC power supplies. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies, such as insufficient power consumption control, reliability issues during upgrades, and contradictions in real-time performance, by proposing a low-power control system for online upgrades of high-voltage DC-DC power supplies. This low-power control system for online upgrades of high-voltage DC-DC power supplies can effectively reduce standby power consumption and improve the success rate of online upgrades.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] Design a low-power control system for online upgrade of high-voltage DC-DC power supplies, including a main control chip and a monitoring circuit. The monitoring circuit includes a current sensor and a comparator connected to the main control chip. The main control chip is connected to a low-power monitoring unit, a dynamic clock module, a voltage monitoring module, and an encryption engine module stored in a memory. The low-power monitoring unit is connected to the comparator for hierarchical wake-up from standby. The dynamic clock module is used to switch between the HSE clock source and the LSI clock source. The voltage monitoring module is connected to the current sensor and uses a voltage adaptive write strategy to detect the 800V bus, 12V output, and 3.3V MCU voltage, forming a triple voltage detection.

[0006] Furthermore, the main control chip is APM32F072.

[0007] Furthermore, the comparator is a TLV1702 comparator.

[0008] Furthermore, the current sensor is an INA240 current sensor.

[0009] Furthermore, the detection threshold for the 800V bus is 750-850V, the detection threshold for the 12V output is 11-14V, and the detection threshold for the 3.3V MCU voltage is 3.0-3.6V.

[0010] Furthermore, it also includes an encryption engine module, which is equipped with an RC4 ciphertext module and an SHA-1 verification module.

[0011] The present invention proposes a low-power control system for online upgrading of high-voltage DC-DC power supplies. The advantages of this system are: it can effectively reduce standby power consumption, effectively improve the success rate of online upgrading of high-voltage DC-DC power supplies, and make online upgrading more reliable and safe.

[0012] 1) This utility model utilizes a dynamic clock module and a low-power monitoring module to achieve a dynamic clock adjustment and graded wake-up mechanism, which can effectively reduce standby power consumption. Under the premise of ensuring ISO21434 functional safety requirements, the standby power consumption is reduced to below 0.5mA, which can avoid low-voltage battery depletion.

[0013] 2) This utility model adopts a voltage adaptive writing strategy through a voltage monitoring module, which can improve the writing success rate and effectively improve the stability and reliability of the upgrade. By combining the RC4 ciphertext module and the SHA-1 verification module, hybrid encryption can effectively improve the security of the system upgrade. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 This is a system block diagram of this utility model;

[0016] The following components are labeled in the diagram: 1. Main control chip; 11. Low power consumption monitoring module; 12. Dynamic clock module; 13. Voltage monitoring module; 14. Encryption engine module; 141. RC4 ciphertext module; 142. SHA-1 verification module; 2. Monitoring circuit; 3. Current sensor; 4. Comparator. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "provided with," "connected," "linked," etc., should be interpreted broadly. For example, "linked" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] The structural features of this utility model will now be described in detail with reference to the accompanying drawings.

[0020] See Figure 1 This embodiment proposes a low-power control system for online upgrading of high-voltage DC-DC power supplies, used in an 800V silicon carbide DC-DC controller. It includes a main control chip 1 and a monitoring circuit 2. The main control chip 1 is an APM32F072. The monitoring circuit 2 includes a current sensor 3 and a comparator 4 connected to the main control chip 1. The comparator 4 is a TLV1702 comparator, and the current sensor 3 is an INA240 current sensor. The main control chip 1 is connected to a low-power monitoring module 11, a dynamic clock module 12, and a voltage monitoring module 13, all stored in a memory. The low-power monitoring module 11 is connected to the comparator 4 and is used for graded wake-up from standby mode. It consists of three levels of wake-up: t1: power-on to ready stage; t2: voltage stability detection stage; and t3: encrypted data block transmission stage. All three wake-up levels operate at the μA level. μA-level standby is achieved through the comparator 4, with a wake-up time of <2ms. Only the comparator 4 operates during the wake-up stage, effectively reducing standby power consumption.

[0021] The dynamic clock module 12 is used to switch between the HSE clock source and the LSI clock source. Specifically, it switches between the HSE (16MHz) and LSI (32KHz) clock sources according to the operation type, performing DeepSleep / PreWake / FullRun tri-state transitions. The voltage monitoring module 13 connects to the current sensor 3 and uses a voltage adaptive write strategy to synchronously detect the 800V bus, 12V output, and 3.3V MCU voltage, forming a triple voltage detection. The detection threshold for the 800V bus is 750-850V. When the detection threshold is <700V or >900V, the process pauses and retryes. The detection threshold for the 12V output is 11-14V. When the detection threshold is <9V, the system switches to the backup LDO for 5ms. The detection threshold for the 3.3V MCU voltage is 3.0-3.6V. When the detection threshold is <2.7V, the upgrade is immediately terminated.

[0022] It also includes an encryption engine module 14, which has an RC4 ciphertext module 141 and an SHA-1 verification module 142. The optimized RC4 ciphertext module 141 combined with the SHA-1 verification module 142 achieves a speed of 1.2ms / KB. First, the RC4 is encrypted with a dynamic key K=Hash[0:15], then the SHA-1 is calculated on the plaintext and appended to the end. When writing, the verification code is verified before writing.

[0023] This invention relates to a low-power control system for online upgrades of high-voltage DC-DC power supplies. Through a dynamic clock module and a low-power monitoring module, a dynamic clock adjustment and graded wake-up mechanism effectively reduce standby power consumption. While maintaining ISO21434 functional safety requirements, standby power consumption is reduced to below 0.5mA, preventing low-voltage battery depletion. The voltage monitoring module employs a voltage adaptive writing strategy, improving the writing success rate and enhancing upgrade stability and reliability. The combination of an RC4 ciphertext module and a SHA-1 verification module for hybrid encryption effectively improves system upgrade security.

[0024] Specifically, during operation, after the DC-DC controller is powered on, the low-power monitoring module 11 keeps the system in a sleep state. When the CAN transceiver detects a valid differential signal, it wakes up the main control chip 1. The comparator 4 performs a three-level wake-up from standby: t1: power-on to ready (50ms ± 5%); t2: three-level voltage stability verification (voltage stability detection window 10ms); t3: dynamic key generation (encrypted data blocks are transmitted every 32KB / 40ms, changed every 24 hours). The dynamic key is derived from the vehicle VIN and RTC timestamp via CRC32. Encrypted data is transmitted in 32KB blocks. Each block performs SHA-1 verification, alternating writing to two banks (Bank1 → Bank2 → Bank1). The RC4 S-box is compressed to 128 bytes, and the SHA-1 calculation retains only 80 bits from the first 160 bits.

[0025] Actual test data: Standby power consumption: 0.28mA; Encryption speed: 1.2ms / KB; Success rate of 100 flash cycles: 99.99%; Low temperature boot at -40℃: 100% success rate.

[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A low-power control system for online upgrading of a high-voltage DC-DC power supply, comprising a master control chip (1) and a monitoring circuit (2), characterized in that, The monitoring circuit (2) includes a current sensor (3) and a comparator (4) connected to the main control chip (1). The main control chip (1) is connected to a low-power monitoring module (11), a dynamic clock module (12), and a voltage monitoring module (13) located in the memory. The low-power monitoring module (11) is connected to the comparator and is used for graded wake-up from standby. The dynamic clock module (12) is used to switch between the HSE clock source and the LSI clock source; The voltage monitoring module (13) is connected to the current sensor (3) and uses a voltage adaptive writing strategy to synchronously detect the 800V bus, 12V output and 3.3V MCU voltage, forming a triple voltage detection.

2. The low-power control system for online upgrade of a high-voltage DC-DC power supply according to claim 1, characterized in that, The main control chip (1) is APM32F072.

3. The low-power control system for online upgrade of a high-voltage DC-DC power supply according to claim 1, characterized in that, The comparator (4) is a TLV1702 comparator.

4. The low-power control system for online upgrade of a high-voltage DC-DC power supply according to claim 1, characterized in that, The current sensor (3) is an INA240 current sensor.

5. The low-power control system for online upgrade of a high-voltage DC-DC power supply according to claim 1, characterized in that, The detection threshold for the 800V bus is 750-850V, the detection threshold for the 12V output is 11-14V, and the detection threshold for the 3.3V MCU voltage is 3.0-3.6V.

6. The low power consumption control system for online upgrade of a high-voltage DC-DC power supply according to any one of claims 1-5, characterized in that, It also includes an encryption engine module (14), which is equipped with an RC4 ciphertext module (141) and an SHA-1 verification module (142).

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