Switched Mode Power Converter With Dynamic Current Thresholds
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Solution Overview
Problem
Switched mode power converters experience significant power losses due to conduction, switching, and hysteresis losses, making it challenging to efficiently regulate output parameters like output voltage and current, and these losses are difficult to minimize analytically due to their complex nature.
Innovation Solution
A power converter circuit with a control circuit that includes a hysteresis controller and an operating point controller, which detects the operating point of the converter stage and adjusts the switching frequency and current thresholds to minimize power losses by optimizing the switching frequency and current levels through the inductor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If switched mode operation is used to regulate output parameters, then power conversion efficiency is improved, but power losses from conduction, switching, and hysteresis increase
Solution Approach 1:
The patent employs feedback control by continuously monitoring the inductor current and comparing it against reference values. The controller adjusts the switching duty cycle based on the error between actual and desired current levels, enabling automatic regulation of output parameters while minimizing power losses through real-time optimization of switching operations.
Solution Approach 2:
The patent dynamically changes operating parameters including switching frequency, duty cycle, and current thresholds based on load conditions and desired output. By adjusting these parameters in real-time, the system optimizes the trade-off between conversion efficiency and power losses under varying operating conditions.
2Measurement precision
If switching frequency is increased to improve regulation precision, then output parameter regulation is improved, but switching losses increase
Solution Approach 1:
The patent implements dynamic switching frequency adjustment where the switching frequency is not fixed but varies based on operating conditions. The controller adapts the switching frequency to maintain precise output regulation while avoiding excessive frequencies that would cause prohibitive switching losses, creating an optimal balance between precision and efficiency.
Solution Approach 2:
The system dynamically changes the switching frequency parameter based on load demands and output requirements. By adjusting this parameter in real-time rather than operating at a fixed frequency, the system achieves precise regulation only when necessary while reducing switching losses during light-load or steady-state conditions.
Data Source
AI summary
Disclosed is a power converter circuit and a method for operating the power converter circuit. The power converter circuit includes at least one converter stage and a control circuit. The at least one converter stage includes an input configured to receive an input power, an output configured to supply an output power, a first electronic switch, and a first inductor coupled to the first electronic switch. The control circuit includes a hysteresis controller configured to drive the first electronic switch based on a current measurement signal representing a current through the inductor, a first threshold signal, and a second threshold signal, and an operating point controller configured to detect an operating point of the converter stage to generate the first threshold signal and the second threshold signal based on the detected operating point.