Timed Wake-Up Circuit for Low-Power BMS Charging Activation
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Solution Overview
Problem
The existing wake-up circuits for electric vehicles consume excessive power from auxiliary batteries as they remain active until the charging plug is removed, and the battery management system continuously draws power, leading to inefficiencies.
Innovation Solution
A wake-up circuit design that includes an input control module, a drive module, and an output control module, which remain active only for a preset time when an external voltage signal is received, and automatically enter a sleep state after charging is complete, minimizing power consumption from the auxiliary power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wake-up circuit remains in a working state until the charging plug is removed, then the battery management system can be reliably woken up for charging, but the auxiliary battery consumes a large amount of power
Solution Approach 1:
The wake-up circuit operates periodically rather than continuously. The control module activates the drive module and output module only for a first preset time duration after detecting the charging plug insertion, then enters a sleep state. This periodic operation ensures reliable wake-up signaling while dramatically reducing auxiliary battery power consumption compared to continuous operation.
Solution Approach 2:
The wake-up circuit dynamically adjusts its operational state based on charging status. The control module transitions between working state and sleep state, and the output module dynamically controls the wake-up signal duration. This dynamic behavior allows the system to maintain reliability when needed while minimizing power consumption during idle periods.
2Reliability
If the wake-up circuit continuously outputs wake-up signals, then the battery management system remains responsive, but power consumption from the auxiliary power supply increases
Solution Approach 1:
The output module outputs wake-up signals periodically rather than continuously. Specifically, it outputs signals for a first preset time duration after charging plug insertion is detected, then stops outputting even if the plug remains connected. This periodic signaling maintains BMS responsiveness during critical periods while reducing auxiliary power supply consumption during extended charging or idle periods.
Solution Approach 2:
The wake-up signal is output for a limited first preset time duration rather than indefinitely. This partial action is sufficient to wake up and maintain BMS responsiveness for the necessary charging operations, but avoids the excessive continuous signal output that would unnecessarily drain the auxiliary power supply.
Data Source
AI summary
Embodiments of this application relate to the field of circuit technologies. A wake-up circuit and a rechargeable device are disclosed. The wake-up circuit includes an input control module, a drive module, and an output control module. The input control module, the drive module, and the output control module each are connected to an auxiliary power supply. The input control module is configured to output a first level signal when an external voltage signal is received. The drive module is configured to, when the first level signal is received, output a second level signal that lasts for a first preset time. The output control module is configured to, when the second level signal is received, output a wake-up signal that lasts for the first preset time to a battery management system. According to this application, the wake-up circuit and the BMS consume less power of the auxiliary power supply.