Multi-Target Temperature Detection Circuit for Light Fixtures
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Solution Overview
Problem
Existing light fixture temperature detection circuits require a large number of single-chip microcomputers and serial ports, increasing costs and complexity, especially in multi-functional designs where numerous heat-generating components need to be monitored for efficient heat dissipation.
Innovation Solution
A multi-target temperature detection circuit with a single-chip microcomputer connected via an integrated communication serial port, such as I2C, allows multiple temperature sensors to share the same bus, reducing the number of serial ports and microcomputers needed, using jumper resistors for address differentiation and SGM452 temperature sensors for precise temperature detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each heat-generating component is connected to a thermosensitive unit with all units connected to a single-chip microcomputer, then the single-chip microcomputer can accurately determine the specific location of heat-generating components, but it requires a large number of ADC serial ports, increasing device complexity and cost
Solution Approach 1:
Multiple temperature sensors are merged into a single temperature detection circuit module that interfaces with the single-chip microcomputer through one serial port. The module internally multiplexes multiple NTC thermosensitive units, allowing accurate temperature monitoring of multiple heat-generating components without requiring proportional increases in serial ports or microcomputers.
Solution Approach 2:
A temperature detection circuit module serves as an intermediary between multiple temperature sensors and the single-chip microcomputer. This intermediate module consolidates multiple ADC channels and serial communication interfaces, reducing the burden on the main microcomputer while maintaining accurate temperature detection capabilities for multiple components.
2Adaptability or versatility
If multiple single-chip microcomputers are added to detect temperature of increasing functional components, then temperature detection coverage is improved, but the cost and complexity of the circuit increases
Solution Approach 1:
The temperature detection circuit module is designed as a universal interface that can accommodate multiple NTC temperature sensors through internal multiplexing. This single module performs the function of multiple separate detection circuits, providing versatile temperature monitoring coverage across all heat-generating components without requiring multiple microcomputers.
Solution Approach 2:
The temperature detection system is segmented into a dedicated temperature detection circuit module that handles multiple sensors, separating this function from the main control microcomputer. This modular segmentation allows the main microcomputer to focus on control functions while the dedicated module handles temperature acquisition from multiple channels.
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
This configuration reduces the number of single-chip microcomputers and serial ports, lowers the cost of the temperature detection circuit, and enables accurate heat dissipation in complex light fixtures by efficiently detecting temperature changes across multiple components, thereby prolonging the service life of heat-generating elements.
Implementation Method 1
an NTC (Negative Temperature Coefficient) circuit is generally subjected to temperature detection in the light fixture, each heat-generating component in the NTC circuit is connected to a thermosensitive unit
Data Source
AI summary
A light fixture having a multi-target temperature detection circuit includes a light source assembly for generating a light path, a light outgoing lens, a plurality of temperature-controlled elements inside the light head of the light fixture, and at least one heat dissipation assembly for dissipating heat from the temperature-controlled elements. A single-chip microcomputer and a plurality of temperature sensors located at various positions inside the light head are included. The single-chip microcomputer is connected to, via an integrated communication serial port, the plurality of temperature sensors connected in parallel and send corresponding address signals and temperature detection signals to the single-chip microcomputer via the integrated communication serial port, and the single-chip microcomputer receives and processes the plurality of temperature detection signals.