Protection IC Calibration Circuit for Battery Pack Voltage and Current
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Solution Overview
Problem
The increasing capacity of batteries requires more sensitive protection circuits to prevent over-voltage and over-current situations, necessitating advanced calibration equipment to accurately calibrate these circuits.
Innovation Solution
A calibration circuit that operates in conjunction with a power source and a battery pack, using a protection IC, selectively couples to either a first or second current loop to calibrate voltage and current, employing voltage and current sensors, sources, and transistors to determine the operating state of the protection IC and trim data for precise calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transistors in protection circuits become more sensitive to handle higher capacity batteries, then protection capability is improved, but calibration equipment must also become more sensitive and complex
Solution Approach 1:
The calibration circuit is divided into two separate current loops: a first current loop for calibrating over-current protection and a second current loop for calibrating over-voltage protection. This segmentation allows each loop to be optimized independently, reducing the overall complexity of the calibration equipment while maintaining high sensitivity for both calibration functions.
Solution Approach 2:
The calibration circuit uses a single power source that can operate in multiple modes: it can provide calibration current through the first current loop, provide calibration voltage through the second current loop, or provide both simultaneously. This multi-functionality reduces the need for separate calibration equipment for different protection parameters, simplifying the overall system.
2Measurement precision
If the calibration circuit uses separate current loops for voltage and current calibration, then calibration precision is improved, but circuit complexity increases
Solution Approach 1:
The calibration circuit merges the voltage calibration and current calibration functions into a single integrated circuit that shares common components such as the power source, switching elements, and control logic. The first and second current loops are integrated within the same calibration circuit architecture, allowing precise calibration of both parameters while avoiding the complexity of completely separate calibration systems.
Data Source
AI summary
A calibration circuit according to various aspects of the present invention comprises a battery pack, a protection IC, and a power source. The power source may have a predetermined voltage and may be selectively coupled to the protection IC. The power source may be capable of providing a current to the protection IC through one of a first current loop and a second current loop, wherein the current through the first current loop generates a first voltage across a first and second terminal of the protection IC, and the current through the second current loop generates a second voltage across the first and second terminals that is substantially equal to the voltage of the power source.