Parallel STC Converter Dead-Time Control for Current Sharing
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Solution Overview
Problem
In power converters with multiple switching tank converter (STC) modules connected in parallel, output currents can diverge due to differences in resonant output impedance, frequencies, and parasitic elements, leading to inefficiencies and potential damage.
Innovation Solution
A non-regulated power converter with a current share interface and dead time adjustor mechanism, where each STC module measures its output current and adjusts dead time based on a minimum current value shared among modules, ensuring balanced output currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple STC modules are connected in parallel to increase power output, then the power delivery capability is improved, but the output current distribution becomes unbalanced due to differences in resonant output impedance, frequencies, and parasitic elements
Solution Approach 1:
The patent implements a feedback mechanism where each STC module measures its own output current and compares it with the minimum current among all modules. Based on this comparison, the module dynamically adjusts its dead time parameter to reduce current imbalance. This closed-loop feedback approach enables automatic current sharing without requiring complex inter-module communication or centralized control.
Solution Approach 2:
Each STC module independently performs current measurement, comparison, and dead time adjustment without external intervention. The modules self-regulate their output currents by autonomously detecting the minimum current level and adapting their operation accordingly, eliminating the need for complex external current sharing circuits or centralized management.
2Manufacturing precision
If the dead time is increased to reduce output current, then the current balance is improved, but the switching efficiency and power output are reduced
Solution Approach 1:
The patent makes the dead time parameter dynamic rather than fixed. Each STC module continuously adjusts its dead time based on real-time current measurements and comparisons. When current imbalance is detected, dead time is increased temporarily to reduce the excessive current; when balance is achieved, dead time returns to its optimal value for maximum efficiency. This dynamic adaptation resolves the contradiction between current balancing and switching efficiency.
Data Source
AI summary
According to an aspect, a non-regulated power converter includes a plurality of switching tank converter (STC) modules configured to be connected in parallel and to a load. The plurality of STC modules includes a first STC module configured to generate a first output current and a second STC module configured to generate a second output current. The first STC module includes an output current (OC) measuring circuit configured to measure a value of the first output current, and a dead time (DT) adjustor configured to compare the value of the first output current with a value of a minimum output current provided by the plurality of STC modules. The DT adjustor is configured to adjust a dead time in response to the value of the first output current being greater than the value of the minimum output current.