Vienna Rectifier Control for Multi-Format Input and Phase Loss
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Solution Overview
Problem
Conventional three-phase Vienna rectifiers are limited to applications with three-phase AC input, lacking flexibility to adapt to different voltage input formats, which restricts their application in various scenarios and can lead to power supply disruptions during phase losses.
Innovation Solution
A rectification control system that includes a Vienna rectifier, a voltage acquisition unit, a fault detection unit, and a control unit, capable of determining the voltage input format and switching between different operating modes based on the acquired voltages and fault detection results, allowing compatibility with DC, single-phase AC, and three-phase AC inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional three-phase Vienna rectifier topology is used, then high power factor and low current harmonics are achieved, but application flexibility is limited to three-phase AC input only
Solution Approach 1:
The rectifier system is designed to perform multiple functions by supporting three different input modes (three-phase AC, single-phase AC, and DC input) using the same hardware topology. The control unit dynamically configures the bridge arm branches based on input type, enabling a single device to serve multiple application scenarios without requiring separate rectifier circuits for each input type.
Solution Approach 2:
The control system dynamically adjusts the operating mode and circuit configuration based on the detected input voltage type. The control unit can switch between different rectification strategies (three-phase Vienna rectification, single-phase Vienna rectification, or uncontrolled rectification) and adjust switch device states in real-time, making the system adaptable to changing input conditions rather than being fixed to a single operating mode.
2Reliability
If phase loss protection shutdown is implemented, then safety is ensured, but power supply continuity to load is affected
Solution Approach 1:
Instead of treating phase loss as a fatal fault requiring shutdown, the system converts this harmful condition into a manageable operating state. When phase loss is detected, the control unit automatically switches to uncontrolled rectification mode using the remaining healthy bridge arm branches, transforming what would be a shutdown-inducing fault into a degraded-but-continuing operation mode that maintains power supply to the load.
Solution Approach 2:
The control system prepares for potential phase loss by having pre-configured fallback operating modes. The fault detection unit continuously monitors input conditions, and when phase loss is detected, the system has already prepared the uncontrolled rectification mode as a cushioning backup, allowing seamless transition without interruption to power supply, thus protecting against the harmful impact of phase loss before it can cause shutdown.
3Adaptability or versatility
If multiple operating modes are supported, then adaptability to different voltage formats is improved, but control system complexity increases
Solution Approach 1:
The control system uses dynamic detection and switching to manage multiple operating modes. The voltage acquisition unit continuously monitors input voltages to identify the input type (three-phase AC, single-phase AC, or DC), and the control unit dynamically reconfigures the bridge arm branches accordingly. This dynamic approach allows the system to adapt to different voltage formats without requiring separate dedicated circuits for each mode, managing complexity through real-time control rather than hardware multiplication.
Solution Approach 2:
The control system segments the rectification function into independent bridge arm branches that can be individually configured. Each bridge arm branch can be independently controlled (switch devices closed or open) based on the detected input type, allowing the system to activate only the necessary segments for the current operating mode. This segmentation enables flexible reconfiguration without requiring the entire system to be redesigned for each input type.
Data Source
AI summary
The present application relates to a rectification control system, a charger and a control method for a charger. The rectification control system includes: a Vienna rectifier, which includes input terminals and output terminals, an output capacitor circuit, and a rectifying circuit which includes a u-phase bridge arm branch, a v-phase bridge arm branch and a w-phase bridge arm branch, each bridge arm branch comprising a switch device and a bidirectional switch unit which are connected in series; a voltage acquisition unit, which is connected to the three input terminals and is configured to acquire voltages Uuv, Uvw and Uwu; a fault detection unit, which is connected to the bidirectional switch units and is configured to detect whether any of the bidirectional switch units fails; and a control unit, which is connected to the voltage acquisition unit and the fault detection unit and is configured to control closing or opening of three switch devices according to voltage input format, voltage connection mode and detection result of the fault detection unit, so as to switch circuit and working mode, making a charger suitable for applications in multiple scenarios and multiple formats.