Vector-Controlled Charging Circuit for Phase-Loss AC-DC Conversion
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Solution Overview
Problem
Existing charging devices struggle to efficiently convert AC power into DC power while maintaining a high power factor, especially when dealing with non-uniform or disconnected phases in three-phase AC power systems.
Innovation Solution
A charging device incorporating a switching element group and inductive elements controlled by a vector control system, which bypasses unusable phases and utilizes vector control to generate stable DC power from usable phases, improving power factor through electromagnetic energy storage and release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional AC-DC conversion methods are used, then the charging device can convert AC power to DC power, but the power factor remains low and energy conversion efficiency is poor
Solution Approach 1:
The patent replaces conventional mechanical switching methods with a vector control system that uses mathematical transformations (dq0 transformation) to control the switching elements. This substitution enables precise control of the conversion process, improving both power factor and energy efficiency by optimizing the timing and duration of switching operations based on real-time phase detection and calculation.
Solution Approach 2:
The system dynamically changes switching parameters (duty ratios, switching timing) based on detected phase information and calculated optimal values. By continuously adjusting these parameters through vector control, the system maximizes energy conversion efficiency and maintains high power factor across varying load conditions and input voltages.
2Power
If three-phase AC power is used for charging, then higher power delivery is achieved, but phase disconnections cause instability and reduce reliability
Solution Approach 1:
The system implements continuous feedback by detecting the actual phase of each AC input, calculating the optimal switching timing based on this feedback, and adjusting the control signals accordingly. This closed-loop control ensures stable operation even when phase disconnections occur, as the system adapts to the actual input conditions in real-time.
Solution Approach 2:
The patent employs dynamic control where the switching timing and duty ratios are continuously adjusted based on the detected phase angles and load conditions. This dynamic adaptation allows the system to maintain stable DC output power delivery even when input phase conditions change or disconnect, ensuring high reliability under varying operational scenarios.
3Device complexity
If simple switching control is used, then device complexity is reduced, but power factor and conversion efficiency deteriorate
Solution Approach 1:
The vector control system performs multiple functions using a unified control architecture: it detects phases, calculates optimal switching timing, generates control signals, and monitors performance all through the same control circuitry. This multi-functionality achieves high power factor and efficiency without proportionally increasing device complexity, as the same hardware resources are utilized for multiple control tasks.
4Productivity
If phase detection and vector control are implemented, then AC to DC conversion efficiency is improved, but control system complexity increases
Solution Approach 1:
The system performs preliminary phase detection and calculation of optimal switching timing before the actual power conversion process begins. By pre-calculating the required control parameters based on detected phase angles, the system simplifies the real-time control execution and reduces the computational burden during high-frequency switching operations, thereby managing complexity while maintaining high conversion efficiency.
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 efficiently converts AC power into DC power, maintaining a high power factor even with phase disconnections, ensuring stable and efficient charging operations.
Implementation Method 1
a first inductive element, a second inductive element, and a third inductive element... The controller is configured to control the first switching element group, the second switching element group, and the third switching element group according to vector control
Data Source
AI summary
A charging device according to the present disclosure include first to third input nodes, first to third switching element groups, first to third inductive elements, and a controller. The first to third switching element groups correspond to the first to third input nodes. The first to third inductive element is connected between the first input node and the first switching element group. The second inductive element is connected between the second input node and the second switching element group. The third inductive element is connected between the third input node and the third switching element group. The controller is configured to control the first to third switching element groups according to vector control using a first phase power and a second phase power when receiving the first phase power at the first input node and receiving the second phase power at the second input node.