Current-Limiting Circuit for Battery-Safe IoT Transmission Power
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Solution Overview
Problem
Connected objects powered by non-rechargeable lithium thionyl chloride batteries face performance degradation due to voltage drops at extreme temperatures, requiring higher currents for data transmission, which exceeds operational thresholds and degrades battery capacity rapidly.
Innovation Solution
A method and device that limit the output current from non-rechargeable energy storage means when temperature demands exceed supply, using a current-limiting circuit to redirect power to rechargeable supercapacitors, preserving battery capacity and ensuring stable data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium thionyl chloride batteries are used to power transmission means, then volumetric capacity is improved, but voltage drops sharply at ambient temperature causing power to fall below operational thresholds
Solution Approach 1:
A current-limiting circuit is introduced as an intermediary between the lithium thionyl chloride battery and the transmission means. This circuit actively monitors battery voltage and current, preventing excessive discharge that causes voltage collapse while maximizing power transfer during safe operating conditions, thus resolving the contradiction between volumetric capacity utilization and power output stability
Solution Approach 2:
The system dynamically adjusts operating parameters (current limits, power thresholds) based on real-time battery state monitoring. By changing these parameters adaptively rather than using fixed values, the system optimizes power extraction from the battery across varying temperature and discharge conditions, maintaining operational thresholds while utilizing available volumetric capacity
2Power
If higher current is drawn from non-rechargeable storage means to compensate for voltage drop at extreme temperatures, then transmission power is improved, but effective capacity degrades rapidly
Solution Approach 1:
A feedback control system continuously monitors battery voltage, current, and temperature, comparing actual values against safe operating thresholds. When voltage drops or current exceeds safe levels, the system automatically adjusts the current limit to prevent capacity degradation, enabling sustained transmission power over the battery's effective lifespan rather than causing rapid depletion
Solution Approach 2:
The current-limiting circuit implements dynamic current management rather than fixed current drawing. It adapts current limits in real-time based on battery state, allowing higher current when battery can sustain it and reducing current when voltage drops, thereby optimizing the balance between transmission power and effective capacity utilization
3Duration of action of stationary object
If current limitation is applied continuously to preserve battery capacity, then battery lifespan is improved, but power availability for transmission means is reduced
Solution Approach 1:
The system implements periodic monitoring and adaptive current limiting rather than continuous fixed limitation. It allows current to rise to meet transmission power demands when battery voltage can sustain it, then applies limitation when voltage drops toward thresholds, creating a rhythm of power delivery and protection that preserves battery lifespan while ensuring adequate power availability during operational periods
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 solution effectively manages current output to maintain battery capacity and ensure reliable data transmission by using a current-limiting circuit to redirect power to rechargeable supercapacitors, enhancing the operational lifespan of non-rechargeable batteries.
Implementation Method 1
a current-limiting circuit (10) coupled to said non-rechargeable means for storing electrical energy and to said rechargeable means for storing electrical energy
Implementation Method 2
The rechargeable storage means then receive the current limited to a defined value for a predetermined period until they can deliver the power required to the transmission means
Data Source
AI summary
This device for managing implementation of a limitation of the value of a current output from non-rechargeable means for storing electrical energy that are intended to power wireless means for transmitting periodically, comprises: —computing means able to determine a current-threshold value depending on a physical quantity; —a current-limiting circuit; —rechargeable means for storing electrical energy, which are coupled to the limiting circuit and are intended to power said data-transmitting means and, —control means able to control the limiting circuit in order to make it perform, for a predetermined time, said limitation only when the value of the current is lower than the threshold value, the limiting circuit being able to deliver the limited current to the rechargeable means for storing electrical energy.