Switched-Mode Power Converter On-Period Control for Parameter Measurement
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Solution Overview
Problem
Switched-mode power converters face challenges in reliably measuring operation parameters, such as input voltage, due to short on-periods that do not meet predefined duration thresholds, affecting the regulation of output voltage and efficiency.
Innovation Solution
A method where the controller adjusts the on-period of the electronic switch to meet a predefined duration threshold by counting successive drive cycles with short on-periods or measuring time since the last valid parameter storage, ensuring reliable measurement and regulation of output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the on-period is shortened to reduce power loss and increase switching frequency, then efficiency is improved, but measurement precision deteriorates because the on-period becomes too short to accurately measure operation parameters
Solution Approach 1:
The system performs preliminary action by forcing the on-period to meet a minimum duration criterion when measurement accuracy is required. The controller monitors whether operation parameters have been stored for a predefined number of drive cycles or time duration, and if not, it extends the on-period to ensure adequate measurement window, thereby preliminarily preventing measurement failures before they occur.
Solution Approach 2:
The system dynamically adjusts the on-period duration based on operational conditions. Normally, the on-period is optimized for efficiency, but when the controller detects that parameters haven't been stored recently (indicating potential measurement gaps), it dynamically extends the on-period to meet the minimum criterion, creating a dynamic balance between efficiency optimization and measurement reliability.
2Measurement precision
If the on-period is extended to improve measurement accuracy, then measurement precision is improved, but power loss increases and switching frequency decreases
Solution Approach 1:
Instead of continuously extending the on-period, the system applies partial action by only forcing the minimum duration criterion when necessary (when parameters haven't been stored recently). This avoids excessive extension of the on-period during normal operation, thereby minimizing power loss while still ensuring measurement accuracy when needed.
Solution Approach 2:
The system changes the on-period parameter dynamically based on measurement history. The controller monitors the storage status of operation parameters and adjusts the on-period duration accordingly - maintaining it at optimized levels for efficiency during normal operation, and extending it only when measurement reliability is at risk, thus optimizing the parameter under different operational states.
3Reliability
If the on-period is consistently extended to ensure parameter storage, then reliability is improved, but productivity decreases due to reduced switching frequency
Solution Approach 1:
The system implements periodic verification rather than continuous extension. The controller checks whether operation parameters have been stored for a predefined number of drive cycles or time duration, and only forces the minimum on-period criterion when this condition is met. This periodic approach ensures measurement reliability while maintaining high switching frequency during normal operational cycles.
Solution Approach 2:
The system uses its own operational data (storage status of operation parameters) to self-regulate the on-period duration. The controller autonomously determines when extension is needed based on whether parameters have been stored recently, eliminating the need for external intervention or continuous monitoring, thereby maintaining high productivity while ensuring reliability through intelligent self-adjustment.
Data Source
AI summary
In accordance with an embodiment, a method includes driving an electronic switch in a switched-mode power converter in successive drive cycles, wherein driving the switch in each of the drive cycles comprises switching on the electronic for an on-period and subsequently switching off the electronic switch for an off-period, and measuring an operation parameter of the switched-mode power converter during the on-periods of the drive cycles, and storing the operation parameter measured in an on-period if a duration of the on-period met a predefined criteria. The method further includes forcing the on-period of a drive cycle to meet the predefined criteria if the operation parameter has not been stored for a predefined number of drive cycles, or for a pre-defined time duration.