Battery Terminal Detection Circuit Without System Voltage Disturbance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery detection methods in electronic devices often destabilize system voltage or require additional components, increasing size and cost, making them unsuitable for certain applications.
Innovation Solution
An integrated circuit performs isolated battery detection by modulating a voltage at the battery terminal using a reference signal, such as a time-varied sinusoidal waveform, without altering the system voltage, and compares the voltage change to determine the presence of a battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing battery detection methods are used, then battery presence can be detected, but system voltage becomes destabilized
Solution Approach 1:
The patent segments the battery detection function from the main power system by introducing a separate detection circuit that operates independently. The detection circuit includes a detection transistor connected to the battery terminal, while the main power converter operates separately, preventing voltage destabilization in the main system during detection operations.
Solution Approach 2:
The patent introduces an intermediary detection circuit that mediates between the battery terminal and the control system. This intermediate circuit uses a detection transistor and associated components to sense battery presence without directly impacting the main power system voltage, acting as a buffer between the detection function and the power system.
2Measurement precision
If existing battery detection methods are used, then battery detection capability is achieved, but additional components are required increasing size and cost
Solution Approach 1:
The patent makes the detection transistor serve multiple functions: it detects battery presence by responding to voltage changes at the battery terminal, and it can be integrated into existing power management circuitry. The same circuit nodes and components used for power management are also utilized for detection purposes, eliminating the need for completely separate detection hardware.
Solution Approach 2:
The patent merges the battery detection function with the existing power converter circuitry. The detection transistor is integrated into the power management IC, sharing common terminals and control logic with the power converter. This consolidation combines detection and power management functions into a single integrated circuit, reducing overall component count and device size.
Data Source
AI summary
In some examples, a circuit includes an amplifier and a comparator. The amplifier has an output terminal, first and second input terminals, and an enable terminal, the second input terminal of the amplifier coupled to the output terminal of the amplifier. The comparator has an output terminal and first and second input terminals, the first input terminal of the comparator coupled to the first input terminal of the amplifier, and the output terminal of the comparator coupled to the enable terminal of the amplifier.