Battery Management Controller Clock Signal Detection
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Solution Overview
Problem
Conventional battery management systems face issues with incorrect mode switching due to parasitic capacitance and disabled power sources, leading to failed activation and improper power control between ship and normal modes.
Innovation Solution
A controller with communication circuitry that detects a clock signal to generate a switching signal, enabling the battery management system to switch from ship mode to normal mode based on terminal voltage variations and ensure proper communication with the host, even when the LDO is disabled in ship mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the LDO is disabled in ship mode to save power, then power consumption is reduced, but the communication circuitry cannot be activated when plugged into a powered-on host
Solution Approach 1:
The system performs preliminary detection of the clock signal through the disabled LDO using minimal power, and prepares the switching mechanism in advance. When a clock signal is detected, the system is ready to immediately activate the LDO and communication circuitry, ensuring reliable activation without continuous power consumption.
2Ease of operation
If the controller switches to normal mode when VPACK+ > VBAT + VTHR, then charging/discharging control is enabled, but parasitic capacitance causes incorrect mode switching
Solution Approach 1:
The system continuously monitors the voltage difference between VPACK+ and VBAT through the amplifier and comparator, and uses this feedback to control the mode switching. The feedback mechanism ensures that mode switching occurs only when the voltage difference exceeds the threshold VTHR, preventing incorrect switching due to parasitic capacitance while maintaining responsive operation.
3Reliability
If the host controls battery management system 160 to provide power to PACK+, then the battery management system 140 can be activated, but the voltage VPACK+ may be less than VBAT preventing mode switching
Solution Approach 1:
The system dynamically adjusts its operation based on the detected voltage conditions. When VPACK+ is initially less than VBAT, the system remains in ship mode and continues to monitor for clock signals. Once the voltage relationship changes or a clock signal is detected, the system dynamically transitions to normal mode, ensuring both reliable activation and proper mode switching capability.
Data Source
AI summary
A controller for a battery management system includes a first terminal, a second terminal, and communication circuitry. The first terminal receives power from a battery in the battery management system. The second terminal receives a clock signal. The communication circuitry coupled to the first and second terminals detects the clock signal, and generates a first switching signal according to a result of detecting the clock signal to control the battery management system to switch from operating in a ship mode to operating in a non-ship mode according to the first switching signal. The detecting and generating are performed with the battery management system in the ship mode. The battery management system disables controlling of charging and discharging of the battery in the ship mode, and the battery management system enables controlling of charging and discharging of the battery in the non-ship mode.