Power Converter Control Using Current Polarity Feedback
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Solution Overview
Problem
Power converters face inefficiencies due to deadtime-induced uncertainty in voltage across inductive components, leading to power losses and limited robustness in response to frequency and phase shifts, which restricts their applications.
Innovation Solution
A method for power control that involves controlling active switching components with duty cycles adjusted based on the polarity of monitored currents through inductive components, using signals with specific duty cycles to minimize DC components and optimize power conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deadtime is introduced to prevent simultaneous conduction of switching components, then short circuits are avoided and voltage overshoot is prevented, but uncertainty in voltage across inductive components increases causing DC component in current and power loss
Solution Approach 1:
The patent measures the actual voltage across the inductive component during deadtime and uses this feedback information to calculate and compensate for the DC component in the current. The controller adjusts the switching duty cycles based on the measured voltage to eliminate the harmful DC offset caused by deadtime, thereby reducing power loss while maintaining the protective deadtime interval.
Solution Approach 2:
The patent dynamically adjusts the duty cycle parameters of the switching components based on the measured voltage during deadtime. By changing the duty cycle parameters in response to actual operating conditions, the system compensates for the voltage uncertainty introduced by deadtime, eliminating the DC component in current and reducing power loss.
2Loss of energy
If deadtime is optimized by measuring voltage drop or wave shape, then DC component in current is partially removed, but complete removal is not achieved and system robustness remains limited
Solution Approach 1:
The system continuously measures the voltage across the inductive component and uses this feedback to calculate the exact DC component in the current. The controller then adjusts the duty cycles based on this feedback to completely eliminate the DC offset, achieving both energy efficiency and system robustness through closed-loop control.
Solution Approach 2:
The patent applies the same voltage measurement and duty cycle adjustment mechanism to multiple switching units and inductive components simultaneously. This universal approach ensures consistent DC component removal across all phases, improving overall system robustness while maintaining energy efficiency.
3Adaptability or versatility
If step change is applied to frequency or phase of voltage, then power conversion operates at different conditions, but current flow period changes causing power peak and DC component that deteriorates transitional timing response
Solution Approach 1:
When frequency or phase changes are detected, the system preemptively adjusts the duty cycles of the switching components before the power peak and DC component can develop. This preliminary adjustment prevents the harmful effects during transitions, maintaining fast response time while enabling flexible frequency and phase operation.
Solution Approach 2:
The system measures the voltage during transitions and uses feedback to detect changes in operating conditions. Based on this feedback, the controller dynamically adjusts duty cycles to prevent DC component formation during frequency or phase transitions, maintaining fast transitional response while enabling adaptability.
Data Source
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AI summary
The present disclosure relates to a method for power control of a power converter comprising: controlling, with a first signal having a first duty cycle D1, a first active switching component in a switching unit of at least one branch; controlling, with a second signal having a second duty cycle D2, a second active switching component of the switching unit; determining a polarity of a monitored current through at least one inductive component coupled to the at least one branch; and adjusting the first duty cycle D1 and the second duty cycle D2 based on the determined polarity. The present disclosure also relates to a respective controller and system.