Temperature Sensing Circuit With Current Amplification Feedback
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Solution Overview
Problem
Existing temperature detectors face challenges in enhancing sensitivity and accuracy for temperature measurement in electronic devices due to limitations in detecting temperature variations effectively.
Innovation Solution
A temperature detector design incorporating a first temperature coefficient component, a multiplier, and an impedance component, arranged in proximity to the circuit under test, which generates an amplified detection current correlated to the circuit's temperature, using a negative temperature coefficient component and a multiplier to amplify temperature detection current, and an impedance component for negative feedback to prevent thermal runaway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional temperature detector is used, then the temperature measurement can be obtained, but the sensitivity and accuracy are insufficient
Solution Approach 1:
The temperature detector is divided into functionally independent modules: a temperature coefficient component for sensing, a multiplier for signal amplification, and an impedance component for feedback control. This segmentation allows each module to be optimized independently, improving overall measurement precision while maintaining detection sensitivity through specialized function allocation.
Solution Approach 2:
The impedance component provides negative feedback to the multiplier, stabilizing the detection current and preventing thermal runaway. This feedback mechanism ensures reliable operation across varying temperature conditions while maintaining high sensitivity through controlled signal amplification.
2Reliability
If signal amplification is increased to improve detection sensitivity, then small temperature variations can be detected, but thermal runaway may occur
Solution Approach 1:
The impedance component is coupled to provide negative feedback that automatically adjusts the detection current based on temperature conditions. When temperature increases cause current amplification, the feedback mechanism reduces the current accordingly, preventing thermal runaway while maintaining the ability to detect small temperature variations.
Solution Approach 2:
The impedance component's resistance value changes with temperature in a controlled manner, dynamically adjusting the feedback strength. This parameter change allows the system to maintain stable operation across different temperature ranges while preserving detection sensitivity through adaptive current control.
3Measurement precision
If the temperature detector is placed close to the circuit under test, then temperature variations can be detected accurately, but the device complexity increases
Solution Approach 1:
The temperature detector integrates multiple functions into a compact configuration where the temperature coefficient component, multiplier, and impedance component work together in a unified circuit arrangement. This merging reduces the overall device complexity while maintaining close proximity to the circuit under test for accurate temperature detection.
Solution Approach 2:
The multiplier serves multiple functions: it amplifies the detection signal from the temperature coefficient component and simultaneously works with the impedance component to provide feedback control. This multi-functionality reduces the need for separate components, simplifying the overall device structure while enabling accurate temperature measurement.
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 design significantly enhances sensitivity and accuracy of temperature detection by amplifying small temperature variations into larger detection currents, while the impedance component helps maintain the operating region of transistors, reducing the risk of thermal runaway and improving the reliability of temperature measurements.
Implementation Method 1
a first terminal of the first temperature coefficient component is coupled to a first voltage terminal or a second voltage terminal, and a second terminal... A voltage at the node is positively correlated to the temperature of the circuit under test
Implementation Method 2
a multiplier... an amplified detection current flowing to the first terminal of the multiplier is positively correlated to the temperature of the circuit under test
Data Source
AI summary
A temperature detector is used to detect a temperature of a circuit under test, and includes a temperature coefficient component, a multiplier, an impedance component and a node. The temperature coefficient component is arranged in proximity to the circuit under test. A control terminal of the multiplier is coupled to a second terminal of the temperature coefficient component. The impedance component is coupled between the second terminal of the temperature coefficient component and the control terminal of the multiplier, or between a second terminal of the multiplier and a third voltage terminal. The node is formed between the second terminal of the temperature coefficient component and the control terminal of the multiplier. A voltage at the node and an amplified detection current flowing to a first terminal of the multiplier are positively correlated to the temperature of the circuit under test.