CAN Wake-Up Control Circuit With Integrated Sleep Signaling
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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 sleep functionality in existing wake-up signals pose challenges for reducing production costs and enhancing 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, leveraging low-cost components for mass production and comprehensive applications.
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 divides the wake-up function from the main control unit and implements it through a separate signal circuit that can be integrated into existing CAN transceivers. This segmentation allows the wake-up capability to be added without requiring expensive dedicated wake-up chips, thereby reducing production costs while maintaining the reliability of the wake-up function.
Solution Approach 2:
The patent makes the CAN transceiver multi-functional by enabling it to perform both traditional CAN communication and wake-up signal generation. The signal circuit within the transceiver can output wake-up signals to external devices, allowing a single component to serve multiple purposes and eliminating the need for additional expensive wake-up chips.
2Reliability
If only wake-up function is implemented, then the wake-up capability is provided, but the sleep function is missing
Solution Approach 1:
The patent extends the signal circuit's capability to provide both wake-up and sleep functions. The same signal circuit that generates wake-up signals can also generate sleep signals to control the power states of battery management modules. This multi-functionality enhances the system's adaptability and versatility without adding separate dedicated circuits for each function.
Solution Approach 2:
The patent combines the wake-up and sleep control functions into a single integrated signal circuit within the CAN transceiver. By merging these functions, the system achieves comprehensive functionality (both wake-up and sleep capabilities) while reducing component count and complexity, thereby improving adaptability without sacrificing functional completeness.
Data Source
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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 comprises a CAN transceiver and a signal circuit which are connected to each other, wherein 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. By using the present application, the application range of the circuit can be widened, and the cost can be reduced.