BMS Wake-Up Circuit Using Pulse Triggering to Prevent Overdischarge
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Solution Overview
Problem
Conventional battery management system (BMS) wake-up technologies have complex structures, making them difficult to control and increasing defect rates, particularly due to continuous power consumption that can lead to overdischarge of battery packs.
Innovation Solution
A BMS wake-up device with a simplified structure that responds to an external power signal, utilizing a pulse generation module and power output module to selectively supply power to the BMS, including a switching unit that allows source power to pass only when the external power signal reaches a preset reference voltage, and an overcurrent and overvoltage protection circuit to stabilize the circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the BMS operates continuously to monitor battery status, then the battery management function is improved, but the battery pack may be overdischarged due to continuous power consumption by the BMS
Solution Approach 1:
The BMS operates in periodic cycles between wake-up state and sleep state. During wake-up state, the BMS monitors battery parameters; during sleep state, the BMS consumes minimal power. This periodic operation resolves the contradiction by providing continuous management functionality while controlling average power consumption to prevent overdischarge.
Solution Approach 2:
The wake-up signal generation circuit detects external power signals in advance and triggers the BMS to wake up before the battery is fully discharged. This preliminary action ensures the BMS is operational when needed while allowing it to remain in low-power state otherwise, resolving the contradiction between continuous monitoring and power consumption.
2Loss of energy
If the BMS is placed in sleep mode to reduce power consumption, then the power consumption is reduced, but the BMS cannot operate when needed to charge the discharged battery module
Solution Approach 1:
The wake-up signal generation circuit continuously monitors for external power signals and provides feedback to control the power supply module. When an external power signal is detected, the circuit triggers the BMS to wake up. This feedback mechanism ensures the BMS operates reliably when needed while maintaining low power consumption during sleep mode.
Solution Approach 2:
The system performs preliminary detection of external power signals while the BMS is in sleep mode. When such signals are detected, the BMS is awakened in advance to prepare for battery management operations. This preliminary action resolves the contradiction by ensuring operational readiness without continuous operation.
3Reliability
If conventional BMS wake-up technology is used, then the BMS can be awakened from sleep mode, but the circuit structure becomes complex and difficult to control, increasing defect rate
Solution Approach 1:
The patent combines the wake-up signal detection, signal processing, and power supply control functions into a single integrated wake-up signal generation circuit. This merging of functions simplifies the overall circuit structure while maintaining the BMS wake-up capability, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The wake-up signal generation circuit performs multiple functions: detecting external power signals, generating wake-up signals, and controlling the power supply module. This multi-functional design eliminates the need for separate circuits for each function, reducing overall circuit complexity while ensuring reliable BMS wake-up operation.
Data Source
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AI summary
The present disclosure discloses an device for waking up a battery management system (BMS) in response to an external power signal received. The BMS wake-up device according to the present disclosure wakes up a BMS in response to an external power signal received from an external power module, and includes a pulse generation module which receives the external power signal from the external power module and is supplied with source power through a different path from the external power signal, and generates a pulse signal depending on whether the source power is passed through when the pulse generation module receives the external power signal, and a power output module which supplies the source power to the pulse generation module, and outputs operating power for operating the battery management system based on the pulse signal when the power output module receives the pulse signal from the pulse generation module.