Power Converter Current Control via Instantaneous Feedback
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Solution Overview
Problem
Conventional power converters experience high conduction and switching losses due to large currents and parasitic elements, which can exceed the maximum current capability of components, leading to potential damage.
Innovation Solution
A power converter system with a primary and secondary bridge unit, a transformer, and a cyclic state controller that uses a current sensor to measure and control the instantaneous current, changing switching states to maintain currents below a designed value, thereby reducing losses and preventing component damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If phase shift control technique is used to control power flow, then power flow control is achieved with simple implementation and large operating range, but large currents are driven inside converter components when voltage ratio is substantially different from transformer ratio, resulting in higher conduction and switching losses
Solution Approach 1:
The patent applies dynamics by transitioning from static phase shift control to dynamic instantaneous current control. The controller continuously monitors instantaneous current and dynamically adjusts switching states in real-time, allowing the system to adapt switching behavior based on actual current conditions rather than relying on fixed phase shift relationships. This dynamic control prevents large currents from occurring in the first place, rather than managing them after they occur.
Solution Approach 2:
The patent implements feedback by using current sensors to measure instantaneous current flowing through converter components and feeding this information back to the controller. The controller uses this feedback to determine appropriate switching states that will maintain current below harmful thresholds. This closed-loop feedback mechanism enables the system to respond to actual operating conditions and adjust control actions accordingly, preventing excessive currents that would cause high losses.
2Ease of operation
If phase shift control technique is used to control power flow, then power flow control is achieved with simple implementation, but current may exceed the maximum current capability of components, resulting in damage to components
Solution Approach 1:
The patent applies preliminary action by proactively controlling instantaneous current before it can exceed safe thresholds. The controller continuously monitors current and takes preemptive switching actions to prevent current from reaching dangerous levels. This is in contrast to protective devices that only act after failure conditions occur. By taking preliminary control action, the system prevents component stress and potential damage before they can occur.
Solution Approach 2:
The patent uses real-time current feedback to maintain component safety. Current sensors continuously monitor instantaneous current and provide feedback to the controller, which adjusts switching states to ensure current remains within safe operating limits. This feedback mechanism creates a protective control loop that actively prevents current from exceeding component capabilities, thereby enhancing reliability and preventing damage.
3Productivity
If higher switching frequencies are used in power converter, then power conversion efficiency is improved, but parasitic elements such as leakage inductance and parasitic inductance become more dominant, resulting in higher switching losses
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting switching parameters based on instantaneous current conditions. Rather than using fixed high-frequency switching that exacerbates parasitic effects, the controller modifies switching timing and duration in real-time based on measured current. This adaptive parameter adjustment allows the system to maintain high conversion efficiency while limiting the impact of parasitic inductances by controlling current magnitude and rate of change during switching events.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces conduction and switching losses and prevents current overload, ensuring the power converter operates within safe current limits, thus extending component lifespan.
Implementation Method 1
a transformer disposed between the primary bridge unit and the secondary bridge unit and configured to magnetically couple the primary bridge unit to the secondary bridge unit
Data Source
AI summary
A power converter is presented. The power converter includes a primary bridge unit coupled to a voltage source. Further, the power converter includes a secondary bridge unit coupled to a load. Also, the power converter includes a transformer disposed between the primary bridge unit and the secondary bridge unit and configured to magnetically couple the primary bridge unit to the secondary bridge unit. Additionally, the power converter includes a current sensor configured to measure instantaneous current flowing at an input terminal of the transformer. Furthermore, the power converter includes a cyclic state controller configured to receive the measured instantaneous current flowing at the input terminal of the transformer, and change a switching state of the power converter from a present switching state to a subsequent switching state based on the measured instantaneous current.