MR Pulsed-Load Power Supply With Fast Current-Feedback Control
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Solution Overview
Problem
In magnetic resonance (MR) systems, supplying power to pulsed loads with high-capacitance capacitors increases volume and cost, affecting system design, as existing solutions struggle to quickly respond to power switching demands of large power pulsed loads like RF power amplifiers and gradient amplifiers.
Innovation Solution
A power supply device comprising a switching power supply module, current measurement module, signal conversion module, and drive controller that uses narrow pulse signals to rapidly adjust power supply, allowing for a smaller capacitance energy storage capacitor to stabilize voltage by promptly responding to power changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a high-capacitance capacitor assembly is used to smooth the voltage output, then voltage stability is improved, but the volume, number, and cost of the capacitor module increase
Solution Approach 1:
The system performs preliminary action by detecting current changes before they cause voltage instability, and preemptively adjusts the power supply output. The control device monitors the current through the capacitor assembly and proactively modulates the switching power supply to prevent voltage fluctuations, rather than reacting after instability occurs. This eliminates the need for oversized capacitors by addressing the root cause of voltage instability.
Solution Approach 2:
The invention implements a feedback mechanism where the control device continuously monitors the current flowing through the capacitor assembly and uses this information to adjust the power supply output. The control device receives current change information, processes it, and generates control signals that feed back to the switching power supply module, creating a closed-loop system that maintains voltage stability dynamically without requiring excessive capacitance.
2Stability of the object's composition
If a high-capacitance capacitor assembly is used to smooth the voltage output, then voltage stability is improved, but the cost of the capacitor module increases
Solution Approach 1:
The system performs preliminary action by detecting current changes before they cause voltage instability, and preemptively adjusts the power supply output. The control device monitors the current through the capacitor assembly and proactively modulates the switching power supply to prevent voltage fluctuations, rather than reacting after instability occurs. This eliminates the need for oversized capacitors by addressing the root cause of voltage instability.
Solution Approach 2:
The invention implements a feedback mechanism where the control device continuously monitors the current flowing through the capacitor assembly and uses this information to adjust the power supply output. The control device receives current change information, processes it, and generates control signals that feed back to the switching power supply module, creating a closed-loop system that maintains voltage stability dynamically without requiring excessive capacitance.
3Speed
If a capacitor module with sufficient capacitance is used, then response speed to power switching is improved, but the volume and cost of the capacitor module increase
Solution Approach 1:
The system performs preliminary action by detecting current changes before they cause voltage instability, and preemptively adjusts the power supply output. The control device monitors the current through the capacitor assembly and proactively modulates the switching power supply to prevent voltage fluctuations, rather than reacting after instability occurs. This eliminates the need for oversized capacitors by addressing the root cause of voltage instability.
Solution Approach 2:
The invention implements a feedback mechanism where the control device continuously monitors the current flowing through the capacitor assembly and uses this information to adjust the power supply output. The control device receives current change information, processes it, and generates control signals that feed back to the switching power supply module, creating a closed-loop system that maintains voltage stability dynamically without requiring excessive capacitance.
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 stable operating voltage to pulsed loads by quickly adjusting power supply, reducing the need for large capacitors and maintaining voltage stability during rapid power fluctuations without increasing volume or cost.
Implementation Method 1
a switching power supply module, which is used to supply power to a pulsed load
Implementation Method 2
an energy storage capacitor, which is connected in parallel to an output end of the switching power supply module
Data Source
AI summary
The present invention relates to a magnetic resonance system and a power supply device for a pulsed load of a magnetic resonance system. Embodiments of the present invention disclose a power supply device for a pulsed load of a magnetic resonance system. The power supply device includes: a switching power supply module, which is used to supply power to a pulsed load; a current measurement module, which is used to generate a pulse measurement signal on the basis of measuring the current of the pulsed load; a signal conversion module, which is used to convert the pulse measurement signal into a narrow pulse signal; and a drive controller, an input end of the drive controller being used to receive the narrow pulse signal, and the drive controller being used to drive the switching power supply module on the basis of the received narrow pulse signal.