CAN Wake-Up and Sleep Control Circuit for Low-Cost BMS
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Solution Overview
Problem
The high cost of chips with CAN wake-up functions in battery management systems of electric vehicles and the lack of a sleep function in these chips contribute to increased production costs and limited functionality.
Innovation Solution
A control circuit utilizing a CAN transceiver with a signal circuit, switch circuit, and trigger circuit to implement both wake-up and sleep functions, reducing production costs through low-cost components and simplified control logic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a chip with CAN wake-up function is used, then the wake-up function is achieved, but the production cost increases
Solution Approach 1:
The patent segments the wake-up function from the main CAN controller chip and implements it through a separate control circuit using a standard CAN transceiver. This separates the high-cost integrated solution into lower-cost discrete components while maintaining the wake-up capability.
Solution Approach 2:
The patent replaces the expensive specialized CAN wake-up chip with a combination of inexpensive standard components (CAN transceiver, switch circuit, trigger circuit). These common components are more readily available and significantly reduce the bill of materials cost.
2Reliability
If a chip with CAN wake-up function is used, then the wake-up function is achieved, but the sleep function is not available
Solution Approach 1:
The patent designs a control circuit that performs multiple functions: wake-up signal generation, sleep signal generation, and CAN communication. The same basic circuit architecture (CAN transceiver + switch circuit + trigger circuit) handles both wake-up and sleep operations, making the system versatile.
Solution Approach 2:
The patent combines the wake-up function and sleep function into a single integrated control circuit rather than using separate chips. The controller coordinates both functions through the same signal path, reducing component count and increasing functional integration.
3Reliability
If a specialized CAN wake-up chip is used, then the wake-up function is reliable, but the circuit complexity increases
Solution Approach 1:
The patent divides the control circuit into modular functional blocks: CAN transceiver for communication, switch circuit for signal routing, and trigger circuit for wake-up generation. This segmentation makes the complex functionality manageable and easier to implement reliably.
Solution Approach 2:
The patent introduces a switch circuit as an intermediary between the CAN transceiver and the controlled device. This intermediary component simplifies the control logic by providing a clear signal path for both wake-up and sleep operations, reducing overall circuit complexity.
Data Source
AI summary
The present application relates to a control circuit, a wake-up and sleep method, a battery management system, and a vehicle. The control circuit includes a controller area network (CAN) transceiver and a signal circuit connected to each other, and the signal circuit is connected to both an external controlled device and a controller; the CAN transceiver is configured to output a first control signal to the signal circuit according to a CAN bus message; and the signal circuit is configured to output a wake-up signal to the controlled device according to the first control signal, and output a sleep signal to the controlled device according to a second control signal output by the controller.