Low-Power Battery Voltage Comparison Circuit
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Solution Overview
Problem
Portable devices face challenges in efficiently monitoring battery conditions without consuming significant battery resources, as existing battery measurement methods often require substantial power and are not suitable for long-lasting onboard power sources.
Innovation Solution
A voltage signal comparison method using electronic components that consume minimal power, formed through a single fabrication process, allowing for low-power battery condition monitoring and alerts, including indications of battery voltage drops and overvoltage, by replicating electric currents and generating output signals based on voltage amplitude comparisons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery measurement circuitry is implemented to monitor battery condition, then battery condition monitoring capability is improved, but power consumption increases
Solution Approach 1:
The patent replaces traditional analog battery measurement circuitry with a digital voltage comparison approach using a comparator circuit. This substitution enables precise battery voltage monitoring while consuming minimal power, as the digital comparator can operate in low-power modes and only activates when voltage thresholds are approached.
Solution Approach 2:
The patent implements dynamic threshold adjustment for voltage comparison, allowing the monitoring system to adapt its sensitivity based on battery charge levels. By changing the reference voltage parameters dynamically, the system achieves accurate monitoring across the entire battery discharge curve while minimizing power consumption during different operating states.
2Measurement precision
If dedicated battery measurement circuitry is used, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the battery voltage comparison function with existing power management integrated circuits (PMICs) or microcontroller units (MCUs). By merging the comparator, reference voltage generation, and threshold detection into existing system components, the patent achieves precise battery monitoring without adding separate dedicated measurement circuitry, thus maintaining measurement precision while reducing overall device complexity.
Solution Approach 2:
The voltage comparator circuit is designed to serve multiple functions: monitoring battery voltage, detecting overcharge conditions, and triggering low-battery alerts. This multi-functional approach eliminates the need for separate dedicated circuits for each monitoring task, achieving comprehensive battery protection with a single integrated solution that reduces device complexity.
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
Enables reliable battery condition monitoring and alerts with minimal power consumption, ensuring portable devices remain operational for extended periods with reduced resource usage, and provides protection against harmful voltage conditions.
Implementation Method 1
the apparatus may compare an amplitude of a first signal to an amplitude of a second signal using a voltage comparator
Data Source
AI summary
Briefly, embodiments of claimed subject matter relate to comparison of a signal amplitude, such as a signal originating from a battery, for example, with a reference signal. A reference signal may be generated via body-biasing of one or more transistors, for example, which permit operation of the one or more transistors in a sub-threshold state, in which current through the one or more transistors comprises an exponential relationship to an applied voltage. Thus, at least in particular embodiments, detection of low battery voltage or battery overvoltage may be performed utilizing only a very small amount of electrical power.