Multiphase High-Voltage Transformer Layout for Low Output Ripple
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Solution Overview
Problem
High-voltage generators face challenges in achieving a small output ripple, particularly in applications like MRI devices, where existing methods to reduce ripple through increased switching frequency or capacitance lead to increased losses or larger size, affecting dynamic response.
Innovation Solution
A high-voltage generator with a multi-phase transformer structure, comprising M magnetic cores, M primary windings, and M*N secondary windings, where the primary windings receive M-phase AC power and are interconnected, with concentrically wound secondary windings, and a rectifier circuit with stacked rectifier modules, reducing ripple without increasing switching frequency or capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If switching frequency is increased to reduce output ripple, then output ripple is reduced, but switching losses increase
Solution Approach 1:
The patent divides the single-phase system into multiple phases (M≥3). By segmenting the power conversion into multiple phases with phase-shifted switching, the output ripple is reduced through phase cancellation effects while maintaining lower switching frequencies, thus avoiding increased switching losses.
Solution Approach 2:
The patent transitions from a single-phase to multi-phase system, adding the dimension of phase number. This dimensional change enables ripple reduction through multi-phase interleaving without requiring proportional increases in switching frequency, thereby decoupling ripple performance from switching losses.
2Manufacturing precision
If capacitance is increased to reduce output ripple, then output ripple is reduced, but generator size increases
Solution Approach 1:
The patent segments the output capacitance requirement across multiple phases. Each phase handles a portion of the total power, allowing smaller individual capacitors to achieve the same overall ripple performance. The combined effect of multiple phases provides equivalent or superior ripple filtering with reduced total capacitance volume.
Solution Approach 2:
By adding the phase dimension (M≥3), the patent enables ripple reduction through temporal interleaving of multiple phases rather than relying solely on increased capacitance. This dimensional approach allows achieving low ripple performance with smaller total capacitance, thereby reducing generator size.
3Manufacturing precision
If capacitance is increased to reduce output ripple, then output ripple is reduced, but dynamic response deteriorates
Solution Approach 1:
The patent segments the power delivery across multiple phases, allowing faster individual phase switching while maintaining low overall ripple. The segmented architecture enables quicker response to load changes in each phase, improving dynamic response without requiring large capacitance values that would slow down the system response.
Solution Approach 2:
By introducing the multi-phase dimension, the patent achieves ripple reduction through phase interleaving rather than large capacitance. This enables the system to maintain low ripple performance while using smaller capacitors with faster response characteristics, thereby improving dynamic response speed.
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 smaller output ripple and faster voltage switching, reducing switching losses and generator size while maintaining consistent leakage inductance parameters.
Implementation Method 1
a high-voltage transformer configured to receive an input of M-phase AC power
Data Source
AI summary
The present disclosure provides a high-voltage generator, which includes a high-voltage transformer. The high-voltage transformer includes M magnetic core assembly, M primary windings, and M*N secondary windings. The magnetic core assembly includes M magnetic pillar sets. The M primary windings are respectively wound on the M magnetic pillar sets. N layers of the secondary windings are concentrically wound on each of the primary windings, and M, N are positive integers. The M primary windings are configured such that first ends of the M primary windings receive the input of the M-phase AC power and second ends of the M primary windings are interconnected.