Three-Phase Electronic Transformer With Balanced Neutral Return
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Solution Overview
Problem
Conventional coil transformers face issues of high heat consumption, high power consumption, difficult installation, low efficiency, and inconvenient transportation due to unbalanced current distribution and frequent high current, leading to component damage and increased layout area.
Innovation Solution
An electronic transformer with a configuration of first, second, and third forward rectifiers and a backward rectifier, performing half-wave rectification on three-phase power sources, followed by superposition and filtering, with a balanced current loop formed through the neutral line, ensuring symmetrical and balanced operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional coil transformers are used for three-phase to DC conversion, then the transformation function is achieved, but heat consumption is high and power consumption is high
Solution Approach 1:
The patent replaces the conventional mechanical coil transformer with an electronic transformer system using semiconductor rectifiers (diodes or transistors) to perform the three-phase to DC conversion. This substitution eliminates the electromagnetic induction losses inherent in coil transformers, significantly reducing heat consumption and improving conversion efficiency.
Solution Approach 2:
The patent changes the operating parameters by using high-frequency switching rectifiers instead of low-frequency electromagnetic transformation. The rectifiers operate at much higher frequencies, allowing for smaller component sizes and reduced energy losses, thereby decreasing heat consumption while maintaining transformation functionality.
2Ease of operation
If conventional coil transformers are used, then the transformation function is achieved, but installation is difficult and transportation is inconvenient
Solution Approach 1:
The patent divides the transformer system into separate functional modules: three independent forward rectifiers for each phase and a backward rectifier for the neutral line. This modular segmentation allows each component to be independently optimized and assembled, simplifying both installation and maintenance while reducing overall system complexity.
Solution Approach 2:
By replacing the bulky mechanical coil transformer with solid-state electronic rectifiers, the system becomes significantly more compact and easier to install. The electronic components require minimal mechanical assembly and are easier to transport, directly addressing the installation and transportation convenience issues.
3Reliability
If unbalanced current distribution occurs in conventional transformers, then transformation is achieved, but components are damaged in short time
Solution Approach 1:
The patent intentionally introduces asymmetry in the rectifier configuration by adding a backward rectifier connected to the neutral line, which compensates for the inherent asymmetry in single-phase rectification. This asymmetric design balances the overall current distribution across all phases, preventing the unbalanced current damage seen in conventional transformers.
Solution Approach 2:
The backward rectifier acts as a feedback mechanism that returns the neutral line current to the power source, creating a closed-loop system. This feedback path ensures that current distribution remains balanced by automatically adjusting for any phase imbalances, thereby improving component durability and reliability.
4Ease of manufacture
If conventional transformer design is used, then transformation function is achieved, but layout area is large and cost is high
Solution Approach 1:
By segmenting the transformer into separate rectifier modules for each phase plus a backward rectifier, the system achieves a more compact layout. Each module can be independently sized and positioned, reducing the total layout area required compared to a single large conventional transformer while simplifying manufacturing processes.
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
Achieves stable output voltage, balanced current distribution, simplified circuit design, reduced layout area and cost, and stable operating temperature, improving operational efficiency and reducing component damage.
Implementation Method 1
Electronic transformers or coil transformers are devices that combine power electronic conversion technology and high-frequency electric energy conversion technology based on the principle of electromagnetic induction to realize electric energy transformation from one electric characteristic into another one
Data Source
AI summary
An electronic transformer includes a first forward rectifier, a second forward rectifier, a third forward rectifier and a backward rectifier. The first forward rectifier is coupled between a first-phase power and a first output terminal. The second forward rectifier is coupled between a second-phase power and the first output terminal. The third forward rectifier is coupled between a third-phase power and the first output terminal. The backward rectifier is coupled between a neutral line and a second output terminal. The first forward rectifier, the second forward rectifier, and the third forward rectifier are configured to half-wave rectify the first-phase power, the second-phase power, and the third-phase power to generate rectified first-phase to third-phase power sources, and superimpose the rectified first-phase to third-phase power sources on the first output end to serve as an output voltage of the electronic transformer.