Voltage Divider Circuit for Series Battery Balancing
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Solution Overview
Problem
Electronic devices with multiple batteries connected in series face challenges in voltage balancing and power management, requiring additional circuits for voltage regulation and balancing, which increases complexity and cost.
Innovation Solution
Incorporating a voltage divider circuit with a power management module and processor to monitor and control the voltage difference between batteries, turning on the voltage divider circuit when a designated condition is met to balance the batteries and adjust the on-resistance of transistors for efficient charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple batteries are connected in series to increase power capacity, then the power source capability is improved, but additional circuits for voltage regulation and balancing are required, increasing device complexity
Solution Approach 1:
The voltage divider circuit is merged with the existing battery management system by utilizing the connection nodes between series batteries. The circuit combines voltage measurement functionality with balancing control, where the same voltage divider structure serves both to measure individual battery voltages and to implement voltage balancing through controlled discharge paths, thereby reducing the need for separate dedicated circuits.
Solution Approach 2:
The voltage divider circuit performs multiple functions simultaneously: it measures the voltage of each individual battery in the series connection, provides a reference for balancing control, and enables the processor to monitor battery states. This multi-functional approach eliminates the need for separate measurement and control circuits, reducing overall system complexity while maintaining full power source capability.
2Reliability
If additional circuits are added for battery balancing and voltage regulation, then battery management capability is improved, but manufacturing cost increases
Solution Approach 1:
The circuit design merges voltage measurement and balancing functions into a single integrated structure. The voltage divider circuit uses the existing connection nodes between series batteries, combining what would traditionally be separate measurement and control circuits into one unified implementation, thereby reducing component count and manufacturing cost while maintaining comprehensive battery management capability.
Solution Approach 2:
The voltage divider circuit utilizes the inherent voltage differences between batteries during charging to automatically establish measurement reference points. The system leverages the natural electrical characteristics of the battery series connection to provide its own measurement and control infrastructure, reducing the need for additional active components and lowering manufacturing costs.
3Measurement precision
If a voltage divider circuit is used to monitor battery voltage, then voltage measurement precision is improved, but the circuit requires additional connection points, increasing device complexity
Solution Approach 1:
The voltage divider circuit is designed to use the existing connection nodes between series batteries for multiple purposes: voltage measurement, balancing control reference, and processor communication. By making these connection points multi-functional, the circuit achieves precise voltage measurement without requiring additional dedicated connection points, thereby maintaining measurement precision while minimizing circuit complexity.
Solution Approach 2:
The voltage divider circuit acts as an intermediary that utilizes the natural voltage distribution across series battery connections. Rather than requiring separate measurement points, the circuit mediates between the existing battery nodes to derive precise individual voltage measurements through voltage division, achieving accurate measurement without adding structural complexity.
Data Source
AI summary
An electronic device is provided. The electronic device includes a voltage divider circuit, a first battery electrically connected to a first point of the voltage divider circuit, and a second battery connected in series to the first battery. A second point different from the first point of the voltage divider circuit is electrically connected from a first node on an electric path through which the first battery and the second battery are electrically connected.