Three-Phase Single-Stage Power Supply With Ripple Compensation
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Solution Overview
Problem
Conventional three-phase single-stage power supplies experience significant low-frequency output voltage and current ripple when operated with single-phase or unbalanced three-phase input voltages, which is undesirable for certain loads such as battery loads.
Innovation Solution
A three-phase single-stage power supply design incorporating a third single-stage conversion module with a buck/boost converter configuration, utilizing a third transformer, relay, auxiliary inductor, and capacitor, or a combination of relays and auxiliary capacitors, to compensate for output voltage and current ripple.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional three-phase single-stage power supply is operated with single-phase or unbalanced three-phase input voltage, then the power supply can still function, but the low-frequency output voltage and current ripple becomes significantly large
Solution Approach 1:
The patent introduces a third single-stage conversion module as an intermediary component that actively compensates for output ripple. This module works in conjunction with the first and second modules to cancel out low-frequency ripple components, thereby resolving the contradiction between input flexibility and output quality.
Solution Approach 2:
The patent changes the operating parameters of the third conversion module dynamically based on detected ripple conditions. By adjusting the duty cycle and switching frequency of the third module, the system can adapt to different input configurations (single-phase or unbalanced three-phase) while maintaining low output ripple.
2Object-affected harmful factors
If a third single-stage conversion module with buck/boost converter configuration is added to reduce output ripple, then output voltage and current ripple is reduced, but device complexity increases
Solution Approach 1:
The patent divides the power supply into three independent single-stage conversion modules, each handling a specific phase or function. The third module is specifically segmented to handle ripple compensation, allowing the system to address output quality without completely redesigning the entire power supply architecture.
Solution Approach 2:
The third single-stage conversion module is designed with multi-functionality, serving both as a power conversion unit and as an active ripple compensation device. This universal design reduces the need for separate dedicated ripple filtering components, thereby limiting the increase in device complexity.
3Object-affected harmful factors
If relays and auxiliary capacitors are used in the third conversion module for ripple compensation, then low-frequency ripple is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent merges the ripple compensation function into the existing third conversion module structure, combining relays, auxiliary capacitors, and switching components into a single integrated unit. This merging approach simplifies manufacturing by reducing the number of separate assemblies and interconnections required.
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 design effectively reduces low-frequency output voltage and current ripple, ensuring stable operation for loads sensitive to such ripples, even with single-phase or unbalanced input conditions.
Implementation Method 1
The transformer is configured to pass the AC signal from a primary side by electromagnetic induction to a secondary side of the transformer
Implementation Method 2
The third single-stage conversion module includes a third transformer, a third output rectifier circuit, a relay, an auxiliary inductor and an auxiliary capacitor
Implementation Method 3
The third single-stage conversion module includes a third transformer, a third output rectifier circuit, a relay, an auxiliary inductor and an auxiliary capacitor
Data Source
AI summary
A three-phase single-stage power supply includes a positive output terminal, a negative output terminal, a first single-stage conversion module, a second single-stage conversion module, and a third single-stage conversion module. Output terminals of the first single-stage conversion module, the second single-stage conversion module and the third single-stage conversion module are connected in parallel between the positive output terminal and the negative output terminal. The third single-stage conversion module includes a third transformer, a third output rectifier circuit, a relay, an auxiliary inductor and an auxiliary capacitor. The third rectifier circuit includes a fifth switch circuit and a sixth switch circuit, which includes two switches connected in series, respectively, and the relay, the auxiliary inductor and the auxiliary capacitor are connected in series between a midpoint of the two switches in the sixth switch circuit and the negative output terminal, to be served as a buck/boost converter.