Integrated Over-Voltage and Temperature Detecting Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional over-voltage and over-temperature protection circuits in electronic devices are separate and complex, leading to increased cost and volume, which complicates meeting small-sized requirements.
Innovation Solution
An integrated over-voltage and over-temperature detecting circuit that includes a voltage-limiting circuit, temperature sensing circuit, current source, and comparing circuits to simultaneously monitor and control voltage and temperature, using components like Zener diodes and NTC thermistors to generate status signals for enabling or disabling protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate over-voltage protection circuit and over-temperature protection circuit are used, then the protection function is reliable, but the device complexity and volume increase
Solution Approach 1:
The patent combines separate over-voltage protection circuit and over-temperature protection circuit into a single integrated detecting circuit. The circuit uses a voltage-limiting circuit to clamp over-voltage conditions and a temperature sensing circuit with equivalent resistance varying with temperature to detect thermal conditions. Both functions share common components including a detecting terminal, current source, and comparing circuits, thereby reducing device complexity and volume while maintaining reliable protection functionality.
Solution Approach 2:
The integrated detecting circuit performs multiple protection functions simultaneously - it monitors both voltage levels and temperature conditions using a unified circuit architecture. The comparing circuit generates different status signals based on whether voltage or temperature thresholds are exceeded, enabling one circuit to serve multiple protection purposes that previously required separate dedicated circuits.
2Reliability
If separate over-voltage protection circuit and over-temperature protection circuit are used, then the protection function is reliable, but the cost and volume of the electronic device increase
Solution Approach 1:
The patent merges over-voltage and over-temperature protection functions into a single integrated circuit, significantly reducing the overall volume occupied by protection circuits. By sharing common components such as the detecting terminal, current source, and comparing circuits, the physical space required for implementation is minimized while maintaining comprehensive protection capabilities.
3Reliability
If separate over-voltage protection circuit and over-temperature protection circuit are used, then the protection function is reliable, but the cost of the electronic device increases
Solution Approach 1:
The integrated detecting circuit reduces manufacturing cost by consolidating multiple protection functions into a single circuit design. This reduces the total number of components required, simplifies the manufacturing process, and lowers assembly complexity compared to implementing separate over-voltage and over-temperature protection circuits.
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 integrated circuit simplifies the protection mechanisms, reducing the overall cost and volume of electronic devices while effectively preventing damage from over-voltage and over-temperature conditions, thus meeting small-sized requirements.
Implementation Method 1
The voltage-limiting circuit is interconnected between a voltage source of the first voltage and a detecting terminal for limiting and controlling the electrical energy magnitude of the first voltage to be transmitted to the detecting terminal through the voltage-limiting circuit
Implementation Method 2
The temperature sensing circuit is interconnected between the detecting terminal and a common terminal. The equivalent resistance of the temperature sensing circuit varies with the temperature
Implementation Method 3
The current source is connected to the detecting terminal for providing a first current to the detecting terminal, so that a detecting voltage is generated at the detecting terminal
Implementation Method 4
The first comparing circuit is connected to the detecting terminal and receives a first reference voltage value. By comparing the magnitude of the detecting voltage with the first reference voltage value, the first comparing circuit generates a corresponding temperature status signal
Data Source
AI summary
An over-voltage and over-temperature detecting circuit includes a voltage-limiting circuit, a temperature sensing circuit, a current source, a first comparing circuit and a second comparing circuit. The equivalent resistance of the temperature sensing circuit varies with the temperature. The current source provides a first current to a detecting terminal, so that a detecting voltage is generated at the detecting terminal. By comparing the magnitude of the detecting voltage with the first reference voltage value, the first comparing circuit generates a corresponding temperature status signal. By comparing the magnitude of the detecting voltage with the second reference voltage value, the second comparing circuit generates a corresponding voltage status signal. If the temperature exceeds the temperature upper limit, the temperature status signal is in an enabling status. If the first voltage exceeds the voltage upper limit, the voltage status signal is in an enabling status.