Distributed-Core Transformer Layout for Low-Ripple X-Ray High Voltage
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Solution Overview
Problem
Conventional high-voltage generators experience increased ripple in output voltage when output capacitance is reduced to achieve fast switching, leading to increased losses and dielectric loss.
Innovation Solution
A transformer design with M primary windings and M*N distributed magnetic cores, where the primary windings are supplied with M-phase alternating current, and secondary windings are connected to rectifier units in series, with magnetic cores arranged in groups and connected using delta or star methods to reduce ripple.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the switching frequency is increased to achieve fast switching of high peak voltage, then the response speed of the circuit is improved, but losses in the inverter circuit, high-voltage transformer, and rectifier circuit increase
Solution Approach 1:
The patent divides the single-phase high-voltage transformer into multiple distributed magnetic cores (three-phase configuration), where each phase has its own magnetic core and windings. This segmentation allows the system to operate at high switching frequencies while distributing the energy losses across multiple independent units, preventing excessive heat concentration and reducing overall system losses.
2Speed
If the output capacitance is reduced to achieve fast switching, then the response speed is improved, but ripple in the output voltage increases
Solution Approach 1:
The patent employs three separate magnetic cores with independent windings instead of a single centralized transformer. Each phase contributes to the overall output, and the distributed capacitance across multiple phases naturally filters voltage ripple without requiring a single large output capacitor. This segmentation maintains voltage stability while enabling fast switching response.
3Device complexity
If a conventional centralized high-voltage transformer is used, then the structure is simple, but the insulation requirements are high and robustness is reduced
Solution Approach 1:
The patent divides the centralized transformer into three separate distributed magnetic cores, each handling one phase. This segmentation reduces the insulation requirements for each individual unit compared to a centralized high-voltage transformer, as each core operates at lower voltage stress. Additionally, the distributed structure improves robustness by isolating faults to individual phases rather than affecting the entire system.
Solution Approach 2:
Each distributed magnetic core is designed with optimized local characteristics suitable for its specific phase, allowing tailored insulation and winding configurations. This local optimization reduces overall insulation requirements while maintaining system reliability, as each unit can be designed for its specific operational conditions rather than requiring uniform high-voltage insulation throughout.
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 achieves reduced output voltage ripple while maintaining fast switching frequency, enhancing robustness and reducing insulation requirements.
Implementation Method 1
The M primary windings are supplied with a M-phase alternating current... second ends of the M primary windings are connected to each other after passing through a plurality of distributed magnetic cores
Implementation Method 2
each of the M*N distributed magnetic cores is provided with a corresponding secondary winding, and each secondary winding is connected to a corresponding one of a plurality of rectifier units
Data Source
AI summary
The present disclosure provides a transformer and an X-ray system. The transformer includes M primary windings and M*N distributed magnetic cores. The M primary windings are supplied with a M-phase alternating current, a first end of each of the M primary windings is supplied with an alternating current of a corresponding phase in the M-phase alternating current, and second ends of the M primary windings are connected to each other after passing through a plurality of distributed magnetic cores in the M*N distributed magnetic cores. The secondary winding on each distributed magnetic core is connected to a corresponding one of a plurality of rectifier units connected in series to output a secondary voltage.