X-ray High Voltage Device Inverter Circuit Switching Control
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Solution Overview
Problem
X-ray high voltage devices face challenges in reducing switching losses due to limitations in implementing zero voltage switching (ZVS) and zero current switching (ZCS) control, particularly at low or high load conditions, leading to potential short-circuit currents and increased energy consumption.
Innovation Solution
An X-ray high voltage device with an inverter circuit and controlling circuitry that acquires inverter current information to implement zero current switching control at a point where the inverter current is substantially 0 and zero voltage switching control at a different point, using phase shift control and stray capacitance to minimize switching losses across varying load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If switching frequency is increased to reduce output voltage ripples and compact structure, then voltage ripple is reduced and device size is decreased, but switching losses increase
Solution Approach 1:
The patent employs periodic switching action at optimized frequency intervals, using phase shift control to periodically adjust switching timing and achieve soft switching conditions, thereby maintaining low voltage ripple while reducing switching losses through periodic resonance cycles
Solution Approach 2:
The patent changes the switching parameter by transitioning from hard switching to soft switching mode, utilizing phase shift control to modify switching timing and achieve zero voltage or zero current switching conditions, thus reducing switching losses while maintaining appropriate switching frequency
2Loss of energy
If zero voltage switching control is implemented to reduce switching losses, then switching losses are reduced, but short-circuit current may flow and damage switching elements when load is small
Solution Approach 1:
The patent implements feedback control by monitoring inverter current levels and using this information to adjust switching control strategy, ensuring that soft switching is only applied when load conditions are appropriate, thereby preventing short-circuit currents while maintaining switching loss reduction when conditions permit
Solution Approach 2:
The patent employs dynamic switching control that adapts to changing load conditions, transitioning between different switching modes based on real-time current levels, allowing the system to optimize for low switching losses when load permits while maintaining safety when load is small
3Loss of energy
If zero current switching control is implemented to reduce switching losses, then switching losses are reduced, but it becomes impossible to implement when load is large due to absence of zero current point
Solution Approach 1:
The patent employs dynamic switching control that adapts to changing load conditions, transitioning between different switching modes based on real-time current levels, allowing the system to optimize for low switching losses when load permits while maintaining safety when load is small
Solution Approach 2:
The patent changes the switching parameter by transitioning from hard switching to soft switching mode, utilizing phase shift control to modify switching timing and achieve zero voltage or zero current switching conditions, thus reducing switching losses while maintaining appropriate switching frequency
4Loss of energy
If phase shift control is used to achieve soft switching, then switching losses are reduced, but device complexity increases due to additional control requirements
Solution Approach 1:
The patent uses phase shift control as an intermediary mechanism that introduces a controllable time delay between switching signals, enabling soft switching without requiring complex additional circuitry, thus reducing switching losses while keeping control complexity manageable
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 effectively reduces switching losses in X-ray high voltage devices both at low and high loads by selectively applying zero current and zero voltage switching controls, enhancing energy efficiency and preventing damage from short-circuit currents.
Implementation Method 1
an inverter circuit which includes a plurality of switching elements
Implementation Method 2
The electrostatic capacitance (a stray capacitance) of such a capacitor may cause the inverter current to have a current resonance
Data Source
AI summary
An X-ray high voltage device according to an embodiment includes: an inverter circuit including a plurality of switching elements; acquiring circuitry configured to acquire information about an inverter current flowing through the inverter circuit; and controlling circuitry configured to determine, on the basis of the information about the inverter current, a first point in time at which the inverter current becomes substantially 0 and to exercise control by implementing zero current switching control on the switching elements at the first point in time and implementing zero voltage switching control on the switching elements at a second point in time excluding the first point in time.