Power Converter Voltage Detection Delay Compensation
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Solution Overview
Problem
In power converters with boost circuits and single-phase inverters, delays in voltage detection can lead to distortion in AC voltage output when switching from boosting to PWM operation, affecting the quality of the AC voltage output.
Innovation Solution
A power converter with a voltage detection filter and a detected voltage modifying unit that compensates for detection delays by modifying the output voltage based on a delay compensating value, ensuring smooth transitions between boosting and PWM operations in the single-phase inverter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a voltage detection filter is used to remove noise from the detected voltage, then the noise removal capability is improved, but a detection delay is introduced that causes distortion in AC voltage output during switching from boosting to PWM operation
Solution Approach 1:
The detected voltage modifying unit performs preliminary action by proactively compensating for the detection delay before it causes waveform distortion. When switching from boosting to PWM operation, the controller modifies the detected voltage using a delay compensating value to anticipate and counteract the phase lag introduced by the filter, ensuring accurate PWM control timing.
Solution Approach 2:
The system implements feedback by using the delay compensating value to adjust the detected voltage based on the known filter characteristics. The controller continuously monitors the operating mode and applies appropriate compensation to the detected voltage, creating a closed-loop correction mechanism that maintains waveform accuracy despite the filter-induced delay.
2Productivity
If the controller switches from boosting operation to PWM operation based on detected voltage, then the power conversion efficiency is improved, but voltage distortion occurs due to detection delay at the switching moment
Solution Approach 1:
The system performs preliminary compensation of the detection delay before PWM operation begins. By modifying the detected voltage with the delay compensating value in advance, during the transition from boosting to PWM operation, the controller ensures that the PWM switching timing remains accurate, preventing voltage distortion while maintaining high power conversion efficiency.
Solution Approach 2:
The detected voltage modifying unit acts as an intermediary between the voltage detection filter and the PWM controller. It processes the detected voltage by applying delay compensation, creating a corrected voltage signal that serves as an accurate reference for PWM control, thus eliminating the harmful effect of detection delay on voltage output quality.
3Measurement precision
If the voltage detection filter processes the detected voltage signal, then the signal quality is improved, but the response time is delayed causing distortion during operation switching
Solution Approach 1:
The controller uses feedback about the filter's delay characteristics to compensate for the detection delay. By calculating and applying a delay compensating value based on the known filter response, the system corrects the detected voltage timing, maintaining both signal quality and accurate response timing during switching operations.
Solution Approach 2:
The system changes the parameter of the detected voltage by applying a delay compensating value to offset the filter-induced time delay. This parameter modification allows the system to maintain accurate voltage detection timing despite the inherent delay in the filtering process, ensuring proper synchronization during boosting to PWM operation transitions.
Data Source
AI summary
A power converter according to one embodiment includes a controller that switches between a boosting operation in a boost circuit and a pulse-width modulation operation in a single-phase inverter. The controller modifies an output from a voltage detection filter based on a delay compensating value for compensating a detection delay introduced by the voltage detection filter, when switching is performed the boosting operation in the boost circuit to the PWM operation in the single-phase inverter.