Averaged Feedforward Control for Stacked Power Modules
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Solution Overview
Problem
Stacked power modules in AC-to-DC converter systems face challenges in input voltage sharing, DC output voltage regulation, and input current shaping, where each module must operate within its input voltage range and ensure that the input current is proportional and in phase with the AC input voltage.
Innovation Solution
The power supply system consists of multiple power modules with input and output stages, where the input stages convert AC voltage to an intermediate voltage and the output stages generate a DC supply voltage. These stages are controlled using common control signals with a common duty cycle to achieve power balance and prevent mismatches between modules, ensuring that input current is proportional to AC input voltage and output voltage is regulated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple power modules are stacked to supply DC voltages from high-voltage AC-to-DC converter systems, then power supply efficiency is improved, but input voltage sharing becomes challenging as each module must operate within its input voltage range
Solution Approach 1:
The patent merges the control of multiple power modules by implementing a common feedback control loop that regulates the total output current of all modules. This unified control approach allows individual modules to operate independently within their voltage ranges while collectively achieving efficient power supply, resolving the contradiction between efficiency improvement and control complexity.
2Loss of energy
If multiple power modules are stacked in an AC-to-DC converter system, then power supply efficiency is improved, but DC output voltage regulation becomes challenging
Solution Approach 1:
The patent implements a feedback control mechanism where the total output current of all stacked power modules is regulated to match a reference current. This feedback loop ensures precise DC output voltage regulation by dynamically adjusting the operation of individual modules based on the aggregate output, thereby maintaining voltage precision while preserving the efficiency benefits of the stacked configuration.
3Loss of energy
If multiple power modules are stacked in an AC-to-DC converter system, then power supply efficiency is improved, but input current shaping becomes challenging to ensure input current is proportional and in phase with AC input voltage
Solution Approach 1:
The patent combines the input current control of multiple power modules by regulating the sum of their individual input currents to match the reference current derived from the AC input voltage. This merged control strategy ensures that the total input current is proportional and in phase with the AC input voltage, while allowing individual modules to operate efficiently within their respective ranges, thus resolving the contradiction between efficiency and current shaping complexity.
Data Source
AI summary
A power supply includes power modules. Each of the power modules includes an input stage and an output stage. The input stage generates an intermediate voltage, and the output stage outputs a DC supply voltage according to the intermediate voltage. The input stages are controlled with at least one first common control signal having a common duty cycle, and the output stages are controlled with at least one second common control signal having a common duty cycle.