Boosting Rectifier Circuit With Balanced Three-Phase Current Flow
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Solution Overview
Problem
Traditional full-bridge rectifier circuits for three-phase AC power systems are limited in output voltage increase and require complex, costly components, leading to voltage drops that can affect industrial applications like motor control precision.
Innovation Solution
A rectifier circuit with a configuration that includes energy storage capacitors and an inductor-based energy filter system, which balances current flow across switching modules, achieving a boosted output voltage that is about 2.8 times greater than the line-line input voltage using simple and low-cost components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional full-bridge rectifier circuits are used for three-phase AC power systems, then the circuit structure is relatively simple, but the output voltage increase is limited and voltage drops occur affecting industrial applications
Solution Approach 1:
The rectifier circuit is divided into multiple independent switching modules (first switching module with first and third switching elements, second switching module with second and fourth switching elements), each handling a specific phase. This segmentation allows each module to contribute to voltage boosting independently, achieving higher overall output voltage while maintaining manageable complexity in each individual module.
Solution Approach 2:
The patent introduces a third dimension to the traditional rectifier by utilizing three-phase AC power systems instead of single-phase, and by adding energy storage elements (capacitors) connected in series at the output. This dimensional expansion enables voltage multiplication effect, achieving approximately 2.8 times voltage increase from line-line input voltage.
2Power
If complex and costly components are used to increase output voltage, then voltage boosting capability improves, but device complexity and cost increase
Solution Approach 1:
The switching elements serve multiple functions: they act as rectifiers converting AC to DC, as voltage multiplication switches, and as current balancing devices through their coordinated operation. The energy storage capacitors simultaneously store energy during high-voltage periods and release it during low-voltage periods, providing voltage smoothing and boosting without requiring complex voltage multiplier circuits.
Solution Approach 2:
The circuit utilizes the inherent properties of the three-phase AC power system and the switching elements' natural characteristics to achieve voltage boosting. The switching elements self-regulate current flow based on voltage potentials, and the energy storage elements automatically charge and discharge based on circuit conditions, eliminating the need for complex control circuits or additional active components.
3Power
If voltage boosting is achieved through traditional methods, then output voltage increases slightly, but voltage drops still affect motor control precision in industrial applications
Solution Approach 1:
The energy storage capacitors are pre-charged during specific phases of the AC cycle when voltage is high, storing energy in advance. This preliminary energy storage ensures that when voltage drops occur during motor control operations, the capacitors can release stored energy to maintain stable output voltage, preventing voltage drops that would affect motor control precision.
Solution Approach 2:
The patent changes the operating parameters by utilizing three-phase AC power systems instead of single-phase, and by configuring switching elements to operate at specific timing based on phase relationships. This parameter change enables the circuit to achieve approximately 2.8 times voltage increase from line-line input voltage, providing sufficient voltage headroom to prevent drops during industrial applications.
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 solution provides a significant increase in output voltage while maintaining balanced current flow, mitigating voltage drops and improving the reliability and cost-effectiveness of rectification for multi-phase AC power systems, thus enhancing performance in industrial applications.
Implementation Method 1
a first energy storage element, and a second energy storage element electrically connected to the first energy storage element at an energy node
Implementation Method 2
an energy filter system electrically connected to the energy node. The energy filter system is configured to electrically connect to one phase of a multi-phase alternating current (AC) power system
Data Source
AI summary
An apparatus includes an energy storage system electrically connected across a bus. the energy storage system comprising: a first energy storage element. and a second energy storage element electrically connected to the first energy storage element at an energy node that is between the first energy storage element and the second energy storage element: and an energy filter system electrically connected to the energy node. The energy filter system is configured to electrically connect to one phase of a multi-phase alternating current (AC) power system.