Constant Current Threshold Control Under Switch Temperature Drift
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Solution Overview
Problem
Existing current control systems fail to maintain a consistent current threshold due to variations in the ON resistance of semiconductor switches caused by temperature changes, leading to improper switching and potential overcurrent conditions.
Innovation Solution
A current control device with a constant current circuit and processing unit that adjusts the applied voltage to match the set current value, using temperature detection and PWM signal duty ratio adjustments to maintain a stable current threshold independent of temperature fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the constant current is adjusted based on ambient temperature to compensate for ON resistance changes, then the current threshold stability is improved, but the constant current may deviate from the set value causing improper switching timing
Solution Approach 1:
The patent implements a feedback mechanism where the processing unit obtains current information indicating the actual constant current drawn by the constant current circuit, compares it with the set value, and determines whether adjustment is needed. This closed-loop feedback ensures the constant current matches the set value while maintaining current threshold stability through temperature-based pre-adjustment.
Solution Approach 2:
The processing unit performs preliminary adjustment of the constant current based on detected ambient temperature before actual switching operations. By anticipating temperature-induced ON resistance changes and adjusting the constant current in advance, the system maintains accurate current threshold comparison without deviating from the set value.
2Measurement precision
If the constant current is kept fixed regardless of temperature, then the constant current accuracy is maintained, but the current threshold varies with temperature causing improper switching
Solution Approach 1:
The patent dynamically changes the constant current parameter based on ambient temperature detection. The processing unit adjusts the constant current value to compensate for temperature-induced ON resistance variations, ensuring that the current threshold remains stable across different operating temperatures while maintaining accuracy through feedback verification.
3Stability of the object's composition
If the constant current is adjusted to compensate for temperature effects, then the current threshold stability is improved, but additional control complexity is introduced
Solution Approach 1:
The processing unit performs the constant current adjustment automatically based on detected ambient temperature without requiring external intervention. The system self-regulates by obtaining current information, comparing it with the set value, and determining necessary adjustments, thereby maintaining current threshold stability through autonomous temperature compensation.
Data Source
AI summary
A current control device includes a constant current circuit and a current adjustment device. The current adjustment device applies a voltage to the constant current circuit. The constant current circuit draws a constant current according to the applied voltage. The micon sets a value of the constant current drawn by the constant current circuit, adjusts the voltage applied to the constant current circuit by the current adjustment device to a voltage according to the set value that is set. The micon adjusts the voltage being applied by the current adjustment device to the constant current circuit based on the difference value between the constant current drawn by the constant current circuit and the set value.