IoT Battery Protection Circuit for Over-Discharge Cutoff
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Solution Overview
Problem
Existing IoT devices using primary batteries face safety issues due to battery overheating and over-discharge, which can lead to reduced battery life and potential fires.
Innovation Solution
A battery power supply circuit with a comparison circuit and protection circuit that monitors battery voltage and temperature, cutting off power supply when the voltage drops below a predetermined threshold and preventing power restoration when the voltage rebounds, thereby preventing over-discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the battery protection circuit turns on the power supply path when voltage increases from below to above the over-discharge threshold, then the battery can be recharged, but the battery may repeatedly enter the over-discharge region causing overheating and safety issues
Solution Approach 1:
The battery protection circuit performs preliminary action by cutting off the power supply path when voltage drops below the over-discharge threshold, and maintains the cutoff state even when voltage recovers. This preliminary protection prevents the battery from entering the over-discharge region again, eliminating the need for repeated charging cycles that could cause overheating and safety issues.
Solution Approach 2:
The battery protection circuit applies preliminary anti-action by preventing the power supply path from being turned on after an over-discharge event. The circuit maintains the cutoff state as a counter-measure against voltage rebound, which would otherwise allow the battery to recharge and potentially enter the over-discharge region again, causing harmful effects.
2Reliability
If continuous monitoring of battery voltage is implemented to prevent over-discharge, then battery safety is improved, but device complexity increases due to additional protection circuits
Solution Approach 1:
The battery protection circuit performs self-service by autonomously monitoring battery voltage and automatically cutting off or maintaining the power supply path based on voltage thresholds. The circuit uses its own internal comparison circuitry to detect voltage conditions and control the power supply path without requiring external control systems, thereby ensuring battery safety while minimizing additional 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
The solution effectively prevents battery over-discharge and overheating, enhancing safety by ensuring the battery does not repeatedly enter the over-discharge region.
Implementation Method 1
The comparison circuit is coupled to the battery and compares a voltage of the battery with a predetermined over-discharge voltage to generate a comparison signal
Data Source
AI summary
The disclosure provides an Internet of things device and a battery power supply circuit thereof. A voltage of a battery is compared with a predetermined over-discharge voltage to generate a comparison signal. A battery protection circuit serves as a power supply path from the battery to a load and determines whether to cut off the power supply path according to the comparison signal. The battery protection circuit cuts off the power supply path when the voltage of the battery decreases from a value greater than the predetermined over-discharge voltage to a value less than the predetermined over-discharge voltage, but does not turn on the power supply path when the voltage of the battery increases from a value less than the predetermined over-discharge voltage to a value greater than the predetermined over-discharge voltage.