Adaptive Sampling Circuit for Transformer Demagnetized Voltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power converter technologies face challenges in precisely measuring demagnetized voltage due to complexity, imprecise sampling under dynamic loading, and limitations related to transformer design.
Innovation Solution
An adaptive sampling circuit comprising a sample-and-hold unit and signal-generation circuit that samples demagnetized voltage based on magnetized voltage, switching signal, and code, allowing for precise feedback signal generation correlated with output voltage, enabling accurate regulation of the power converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple-sampling circuit is used to measure reflected voltage and discharge time, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential sampling function needed for demagnetized voltage detection, using a single sampling circuit with adaptive timing control. This eliminates the need for multiple sampling circuits while maintaining measurement capability, directly resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The sampling circuit is designed to perform multiple functions: it samples the demagnetized voltage, determines the end of demagnetization, and provides feedback for regulation. This multi-functionality replaces what would otherwise require separate dedicated circuits, reducing overall device complexity while maintaining measurement precision.
2Speed
If causal sampling circuit is used to measure reflected voltage and demagnetizing time, then measurement speed is improved, but measurement precision deteriorates under dynamic loading
Solution Approach 1:
The patent implements adaptive sampling timing that dynamically adjusts the sampling moment based on real-time detection of the demagnetization end point. The sampling circuit responds to the actual transformer state rather than using fixed timing, maintaining precision under dynamic loading conditions while preserving fast response capability.
Solution Approach 2:
The sampling circuit incorporates feedback mechanisms that monitor the transformer's demagnetization status and adjust sampling timing accordingly. This feedback ensures that sampling occurs at the optimal moment regardless of loading conditions, resolving the contradiction between speed and precision under dynamic operation.
3Measurement precision
If linear-predict sampling is used to measure demagnetized voltage, then measurement precision is improved, but adaptability is limited by transformer turn ratio design
Solution Approach 1:
The circuit performs preliminary detection of the demagnetization end point before the actual sampling operation. This preliminary action allows the system to prepare the optimal sampling timing in advance, ensuring high measurement precision while maintaining adaptability to different transformer designs through software or control logic adjustment rather than hardware redesign.
Solution Approach 2:
The patent enables adaptability by allowing parameter adjustments (such as sampling timing, threshold values, or gain settings) to be changed based on different transformer configurations. This parameter-based adaptability maintains measurement precision across various turn ratios without requiring hardware redesign, resolving the contradiction between precision and versatility.
Data Source
AI summary
An adaptive sampling circuit of the power converter according to the present invention comprises a sample-and-hold unit and a signal-generation circuit. The sample-and-hold unit is coupled to a transformer to generate a feedback signal by sampling a demagnetized voltage of the transformer in response to a sample signal. The signal-generation circuit generates the sample signal in response to a magnetized voltage of the transformer, the demagnetized voltage of the transformer, a switching signal and a code. The sample signal is used for sampling the demagnetized voltage. The feedback signal is correlated to an output voltage of the power converter. The switching signal is generated in response to the feedback signal for switching the transformer and regulating the output of the power converter. The adaptive sampling circuit is used to precisely measure the demagnetized voltage of the transformer without the limitation of the transformer design.