BMS Wake-Up Circuit With Self-Locking Sleep Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery management systems (BMS) cannot enter sleep mode unless the charging device is unplugged, leading to increased lead-acid power consumption in vehicles.
Innovation Solution
A BMS sleep wake-up circuit and method that generates an enabling level to activate the wake-up chip when the charging device is plugged in, and uses a self-locking signal to allow the BMS to enter sleep mode while the charging device remains plugged in, preventing mutual interference and reducing lead-acid consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the BMS is designed to wake up when the charging device is plugged in, then the charging function is ensured, but the BMS cannot enter sleep mode while the charging device remains plugged in, leading to increased power consumption
Solution Approach 1:
The patent segments the wake-up signal processing into two independent parts: a trigger signal generated when the charging device is plugged in, and a self-locking signal that maintains the wake-up state. This segmentation allows the BMS to enter sleep mode while keeping the charging device connected, as the self-locking mechanism ensures the wake-up state is maintained without continuous power consumption from the charging connection detection
Solution Approach 2:
The patent introduces a self-locking signal as an intermediary mechanism between the trigger signal and the BMS wake-up state. This self-locking signal acts as a mediator that maintains the wake-up state independently after the initial trigger, allowing the BMS to sleep while the charging device remains plugged in without continuously consuming power for detection
2Reliability
If the enabling circuit continuously detects the charging device connection status, then the wake-up function is reliable, but the circuit complexity increases and power consumption rises
Solution Approach 1:
The patent implements preliminary action by generating a trigger signal when the charging device is plugged in, which then activates the self-locking mechanism. This preliminary trigger action establishes the wake-up state before the BMS needs to operate, allowing the system to enter sleep mode while maintaining the charging function through the self-locking signal without requiring continuous detection circuitry
Solution Approach 2:
The self-locking signal serves the system itself by maintaining the wake-up state autonomously after the initial trigger. This self-service mechanism eliminates the need for continuous external monitoring or complex detection circuits, reducing both circuit complexity and power consumption while ensuring reliable wake-up functionality
Data Source
Figure 1~2
Figure 3~4
AI summary
A BMS sleep wake-up circuit and method, a BMS, and an electric device are provided. The BMS sleep wake-up circuit is provided with an enabling circuit (120). When a charging device (10) is connected, in response to the charging device being plugged in, the enabling circuit (120) generates an enabling level to wake up a BMS, and outputs a self-locking signal through a control circuit (130), so that a wake-up chip (200) keeps the BMS awake. Additionally, under the condition that the charging device remains plugged in, after the self-locking signal is canceled, the wake-up chip is turned off, so that the BMS can enter a sleeping state, thereby solving the problem in the related art that a BMS cannot enter a sleeping state unless a charging device is unplugged.