Power Load Detection Circuit With Feedback Calibration
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Solution Overview
Problem
Existing power supply systems face challenges in accurately detecting output power and correcting errors, particularly when supplying power with multiple voltages, due to resistance errors and normalization control errors.
Innovation Solution
A detection circuit for power load is introduced, comprising a sensing circuit and a signal generation circuit with a calibration circuit. The sensing circuit senses output power signals and generates a power sensing signal, while the signal generation circuit generates a power ratio signal that is adjusted by the calibration circuit for feedback control, thereby correcting errors and ensuring accurate output power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current detection resistors are used to detect output power in single voltage supply, then power detection is achieved, but the power ratio signal includes the sum of resistance errors caused by all resistors
Solution Approach 1:
The patent introduces a feedback mechanism where the detected power ratio signal is fed back to adjust and correct the resistance errors automatically. This closed-loop system continuously monitors the output power and compensates for cumulative resistance errors, thereby improving both measurement precision and signal accuracy without requiring manual calibration.
Solution Approach 2:
The patent replaces manual calibration methods with an automatic electronic correction system. Instead of mechanically adjusting resistors or performing manual error compensation, the system uses electronic feedback control to automatically detect and correct resistance errors, eliminating the need for mechanical intervention and improving reliability.
2Measurement precision
If current detection resistors are used to detect output power in multiple voltages supply, then power detection is achieved, but the power ratio signal includes resistance errors and normalization control errors
Solution Approach 1:
The patent employs a feedback control system that detects both resistance errors and normalization control errors in multi-voltage power supplies. The system automatically adjusts the power ratio signal based on detected errors, ensuring accurate power detection across multiple voltage levels without manual intervention.
Solution Approach 2:
The patent dynamically adjusts circuit parameters to compensate for errors in multi-voltage systems. By changing operational parameters based on detected error conditions, the system maintains accurate power ratio signaling across different voltage configurations, resolving both resistance and normalization control errors.
3Measurement precision
If manual calibration is performed to correct resistance errors, then accuracy is improved, but operation complexity and time consumption increase
Solution Approach 1:
The patent implements a self-calibrating system that automatically detects and corrects its own errors without external intervention. The power supply system performs self-diagnosis and self-correction of resistance errors, eliminating the need for manual calibration operations and maintaining high accuracy while simplifying operation.
Solution Approach 2:
The automatic feedback mechanism continuously monitors detection accuracy and performs real-time error correction. This eliminates the need for periodic manual calibration, reducing operation complexity and time consumption while maintaining measurement precision.
4Measurement precision
If automatic error correction is implemented, then power detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into a unified error correction system. The same feedback circuit that detects power ratio errors also performs normalization control correction, reducing the need for separate correction circuits and minimizing overall device complexity while improving detection accuracy.
Solution Approach 2:
The patent combines resistance error correction and normalization control error correction into a single integrated feedback system. By merging multiple correction functions into one unified circuit, the system achieves high detection accuracy without proportionally increasing device complexity.
Data Source
AI summary
The present application relates to a detection circuit for power load and a method for detection thereof. The detection circuit comprises a sensing circuit and a signal generation circuit. The signal generation circuit includes a calibration circuit. The sensing circuit senses an output power signal of a power supply unit for obtaining a sensing impedance. Thereby, a corresponding power sensing signal is generated according to the sensing impedance and the output power signal. The signal generation circuit generates a power ratio signal. The calibration circuit generates a calibrating signal according to the power ratio signal for driving the signal generation circuit to perform feedback control for generating the power ratio signal. The power ratio signal will match the load condition and be applied to provide the output power signal with less error.