Charging Socket Wake-Up Circuit Bypassing CAN Bus Delays
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Solution Overview
Problem
Current electric vehicle charging systems experience slow wake-up response speeds and unstable signal transmission due to reliance on the CAN bus for waking up the charging socket, which leads to inefficiencies and interference issues.
Innovation Solution
A charging wake-up circuit that includes a state signal detection unit to generate input signals based on the open/closed state of the charging socket cover, with a wake-up signal output unit directly connected to the charging socket control unit, allowing for a level signal to serve as a wake-up signal, bypassing the CAN bus and improving response speed, power efficiency, and anti-interference performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the CAN bus is used to wake up the charging socket, then the system can achieve wake-up function, but the response speed is slow and signal transmission is unstable
Solution Approach 1:
The patent extracts the wake-up signal transmission path from the CAN bus and creates a separate direct connection between the charging socket cover switch and the charging socket control unit. This removes the signal from the crowded CAN bus environment, eliminating interference issues and improving both response speed and transmission stability.
Solution Approach 2:
The patent segments the wake-up control function into an independent circuit path, separating it from the main CAN bus communication system. The wake-up signal is handled by a dedicated circuit involving the cover switch and control unit, while other communications continue via CAN bus, allowing independent optimization of each path.
2Device complexity
If the CAN chip is used to wake up the charging socket, then the wake-up function can be achieved, but the power consumption is high and the system complexity increases
Solution Approach 1:
The charging socket cover switch directly generates the wake-up signal without requiring the CAN chip or other complex control components to initiate the wake-up process. The mechanical action of opening/closing the cover self-generates the electrical signal needed to wake up the charging socket control unit, simplifying the system and reducing power consumption.
Solution Approach 2:
The patent replaces the electronic/software-based CAN chip wake-up mechanism with a direct mechanical-to-electrical signal path through the cover switch. This mechanical trigger system is more energy-efficient and simpler than maintaining a CAN chip in a wake-up state and processing messages through software protocols.
Data Source
AI summary
The present disclosure relates to the technical field of electric vehicle charging, and in particular to a charging wake-up circuit, a charging socket and an electric vehicle. The charging wake-up circuit includes: a state signal detection unit and a wake-up signal output unit. The state signal detection unit is configured to generate a state input signal based on an open state and a closed state of a charging socket cover of an electric vehicle; and an input end of the wake-up signal output unit is connected to an output end of the state signal detection unit, an output end of the wake-up signal output unit is connected to a charging socket control unit of the electric vehicle, and the wake-up signal output unit is configured to output, based on the state input signal, a change in a level signal to serve as a wake-up signal for the charging socket control unit. The charging wake-up circuit of the present disclosure has low costs, is low in power consumption and has good anti-interference performance, and the charging socket control unit can directly acquire the wake-up signal, so that the response speed is high.