Backup Battery Management Using Synchronous Step-Up Circuit
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Solution Overview
Problem
Existing backup battery management systems for emergency call devices in vehicles are costly and inefficient in monitoring the state of health of rechargeable backup batteries, particularly due to the need for separate discharge test circuits and voltage step-up functions.
Innovation Solution
A backup power supply system utilizing a synchronous voltage step-up circuit with a coil, a first transistor (foot transistor), and a second transistor (output transistor) that performs both voltage step-up and discharge test functions, allowing for a combined and cost-effective solution by using the first transistor for both functions, with additional features like current measurement and coulometer circuits for accurate state of health assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate discharge test circuit is used to monitor backup battery state of health, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The first transistor is designed to serve dual purposes: functioning as the foot transistor in the voltage step-up circuit for normal operation, and simultaneously serving as the discharge test circuit when activated in test mode. This multi-functionality eliminates the need for a separate discharge test circuit while maintaining state of health monitoring capability
Solution Approach 2:
The patent combines the voltage step-up function and discharge test function into a single integrated circuit structure. The control unit manages different operational modes, allowing the same hardware components (first transistor, coil, second transistor) to perform both voltage conversion and battery health assessment functions
2Measurement precision
If a specific discharge test circuit based on p-type MOSFET and current source is used, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The first transistor serves dual purposes as both the foot transistor for voltage step-up operation and the discharge test circuit element, eliminating the need for separate dedicated test components and reducing overall manufacturing cost
Solution Approach 2:
The system uses its own existing components (first transistor, control unit) to perform self-diagnosis and state of health monitoring, rather than requiring external or separate specialized test equipment, thereby reducing manufacturing complexity and cost
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces costs while providing accurate monitoring of the backup battery's state of health, ensuring reliable emergency call functionality even after years of inactivity, with the ability to recharge the battery and maintain user device power during exceptional circumstances.
Implementation Method 1
a synchronous voltage step-up circuit... a coil, a first transistor, referred to as the foot transistor; a second transistor, referred to as the output transistor
Data Source
AI summary
A backup power supply system that is intended to be installed in a vehicle, the system includes a backup battery, a synchronous voltage step-up circuit, a user device providing an emergency service, supplied with power under normal circumstances by the main battery of the vehicle, and under exceptional circumstances by the backup battery through the voltage step-up circuit. The voltage step-up circuit includes a coil, a first transistor and a second transistor. The system includes a backup battery discharge test circuit. The first transistor is used to draw current from the backup battery according to a predefined pattern, which makes it possible, by simultaneously measuring the voltage of the backup battery, to determine an indicator of the state of health of the backup battery.