Resonant Inverter Delay Compensation for Accurate Feedback Sampling
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Solution Overview
Problem
Resonant converters face challenges in achieving accurate power factor correction due to time delays in switch drivers and networks, which affect the sampling of electrical feedback parameters, leading to reduced performance.
Innovation Solution
A resonant inverter system that includes a timing module to determine and account for time delays between switch drive signals and output changes, allowing for precise sampling of electrical feedback parameters at the moment of switching, thereby improving power factor correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sampling is performed at the time of switch drive signal change, then control responsiveness is improved, but measurement precision deteriorates due to time delay between drive signal and actual output change
Solution Approach 1:
The timing module measures the time delay in advance between the switch drive signal change and the actual output change. This pre-measured delay information is then used to compensate the sampling timing, allowing the system to account for the delay without sacrificing control responsiveness. The delay measurement is performed preliminarily and stored for subsequent sampling operations.
Solution Approach 2:
The system dynamically adjusts the sampling timing parameter based on the measured time delay. By changing the sampling moment from the drive signal change time to (drive signal change time + measured delay), the system optimizes the sampling accuracy while maintaining responsive control. This parameter adjustment resolves the contradiction between responsiveness and precision.
2Device complexity
If sampling time is fixed at drive signal change moment, then device complexity is reduced, but power factor correction performance deteriorates due to inaccurate feedback parameter sampling
Solution Approach 1:
The timing module acts as an intermediary component that bridges the simple drive signal timing and the actual output response timing. It measures and provides the delay compensation information without adding significant complexity to the overall system. This intermediary enables accurate sampling timing while maintaining relatively simple device architecture.
3Ease of operation
If sampling occurs without delay compensation, then ease of operation is improved, but loss of information increases due to inaccurate electrical feedback parameter values
Solution Approach 1:
The system performs self-compensation by automatically measuring its own internal time delay and using this information to adjust the sampling timing. This self-service approach maintains ease of operation as the compensation happens automatically without requiring external intervention or complex manual adjustments, while simultaneously preventing information loss through accurate sampling.
Data Source
AI summary
A resonant inverter for a resonant converter, comprising a switch network and a resonant tank circuit. The switch network is controlled by a control circuit, which is responsive to a sampled electrical feedback parameter provided by the resonant tank circuit. The value of the sampled electrical feedback parameter or the time of sampling the electrical feedback parameter is modified in response to a measured time delay between the control circuit indicating a desire to change a switching state of the switch network, and the output of the switch network responding to this desire.