Temperature Correction Circuit Without Sensor-Induced Discontinuities
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Solution Overview
Problem
Existing temperature correction methods for voltage and current outputs, such as global and piecewise temperature corrections, face challenges in maintaining continuous signal correction without discontinuities, especially due to temperature sensor offsets and hysteresis.
Innovation Solution
A temperature-dependent correction circuit that rectifies signals varying with temperature to produce a correction signal, which is then added to a reference signal to generate an output signal, eliminating the need for temperature sensors and ensuring continuous correction across temperature ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors and comparators are used for piecewise temperature correction, then temperature range detection is improved, but device complexity and discontinuities in correction signal increase
Solution Approach 1:
The patent extracts and eliminates the temperature sensor and comparator components from the correction system. Instead of using these separate sensing components, the invention uses the inherent temperature-dependent characteristics of the reference signal itself and supply signals to determine temperature ranges and generate appropriate correction signals, thereby reducing device complexity while maintaining correction functionality
Solution Approach 2:
The reference circuit and supply signals serve dual purposes: they both generate the reference output signal and simultaneously provide temperature information for correction. The temperature-dependent drift of the reference signal and supply signals is exploited as a self-indicating mechanism, eliminating the need for external temperature sensors and making the system self-sufficient for temperature-aware correction
2Measurement precision
If temperature sensors and comparators are used for piecewise temperature correction, then temperature range detection is improved, but discontinuities in correction signal increase
Solution Approach 1:
The patent merges the temperature range detection function with the correction signal generation function by using the same temperature-dependent signals (reference signal and supply signals) for both purposes. This integration ensures that the transition between temperature ranges is smooth and continuous, as the correction signal is derived from the same continuous temperature-dependent characteristics that define the ranges, eliminating discontinuities
Solution Approach 2:
The invention preliminarily establishes continuous correction signals by designing supply signals with specific temperature characteristics that naturally provide smooth transitions between temperature ranges. The correction signals are pre-configured to match the temperature-dependent behavior of the reference signal, ensuring continuity before temperature variations occur
3Device complexity
If global temperature correction is applied, then device complexity is reduced, but manufacturing precision and drift correction effectiveness deteriorate
Solution Approach 1:
The patent segments the temperature correction into multiple temperature ranges, each with its own correction signal tailored to specific temperature conditions. This piecewise approach divides the broad temperature spectrum into manageable segments, allowing for more accurate correction in each segment while maintaining reasonable device complexity through the use of temperature-dependent signal characteristics
Solution Approach 2:
The invention changes the parameters of the correction signals to match different temperature ranges. By adjusting the correction signal characteristics (magnitude, slope) based on temperature-dependent supply signals, the system achieves high manufacturing precision and drift correction effectiveness across varying temperature conditions without requiring complex switching mechanisms
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 proposed solution effectively provides a piecewise correction signal without discontinuities, ensuring a stable output signal that does not drift with temperature changes, thus improving the precision of applications like references and temperature sensors.
Implementation Method 1
The rectifying circuit is configured to receive the first and second signals, rectify the first signal to produce a first rectified signal
Implementation Method 2
The first supply source is configured to supply a first signal that varies with temperature along a first constant or continuously variable slope
Implementation Method 3
The second supply source is configured to supply a second signal that varies with temperature along a second constant or continuously variable slope
Implementation Method 4
add the first rectified signal to the second signal to produce a correction signal
Implementation Method 5
The reference is configured to receive the correction signal
Data Source
AI summary
A temperature dependent correction circuit includes a first supply source, a second supply source, a rectifying circuit, and a reference. The first supply source is configured to supply a first signal that varies with temperature along a first constant or continuously variable slope. The second supply source is configured to supply a second signal that varies with temperature along a second constant or continuously variable slope. The rectifying circuit is configured to receive the first and second signal, rectify the first signal to produce a first rectified signal, and add the first rectified signal to the second signal to produce a correction signal. The reference is configured to receive the correction signal.