Multi-Output High-Voltage Power Supply for Fast X-Ray Cathode Switching
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Solution Overview
Problem
Existing high-voltage power supplies are single-output and take a long time to adjust output voltages, which is not suitable for distributed X-ray sources requiring fast switching and flexible voltage adjustment within microseconds to manage multiple cathodes efficiently, and they generate excessive heat due to MOSFET operation in the linear region.
Innovation Solution
A multi-output high-voltage power supply with a channel selection circuit and a high-voltage power supply module comprising fine and coarse adjusting power supply components, where switches operate in a switching state to avoid linear operation, allowing for fast voltage adjustment and heat reduction by using direct current-isolated power supply modules and bypass diodes, and a control circuit for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If MOSFET operates in linear region for voltage adjustment, then voltage can be continuously adjusted, but MOSFET generates large amount of heat and may be damaged
Solution Approach 1:
The voltage adjustment function is segmented into two independent parts: coarse adjustment through series connection of multiple power supply modules (each contributing a fixed voltage portion) and fine adjustment through a separate circuit. This eliminates the need for MOSFET linear operation, as the series-connected modules provide discrete voltage steps without generating excessive heat, while the fine adjustment circuit handles minor variations separately.
2Device complexity
If single-output power supply is used for multiple cathodes, then device complexity is reduced, but switching time becomes too long (milliseconds or seconds)
Solution Approach 1:
The power supply system is segmented into multiple independent power supply modules connected in series, with each module capable of being independently controlled and switched. This allows different cathodes to receive voltage from different module combinations, enabling fast switching between channels by simply reconfiguring the series connections rather than adjusting a single power supply, thus reducing switching time to microseconds while maintaining manageable complexity through modular design.
Solution Approach 2:
The power supply system transitions from a static single-output configuration to a dynamic multi-module series connection system where the configuration can be rapidly changed. The modules can be dynamically reconnected in different series combinations to serve different cathodes, enabling fast switching responses required for multiple cathode operation with microsecond time scales.
3Adaptability or versatility
If MOSFET is used for channel switching, then channel selection capability is achieved, but MOSFET cannot be maintained in operating state continuously with high duty cycle
Solution Approach 1:
The channel switching function is extracted from the voltage adjustment function and implemented through the series connection configuration of power supply modules. Instead of using MOSFETs to switch channels while maintaining linear operation for voltage control, the system uses the modular series architecture to inherently provide channel selection by activating different module combinations, thereby removing the burden of continuous high-duty-cycle switching from individual MOSFETs and improving their reliability.
Data Source
AI summary
Embodiments of the present disclosure disclose a multi-output high-voltage power supply including a channel selection circuit (103) including a plurality of switches; and a high-voltage power supply module (101) connected to the channel selection circuit (103), wherein the high-voltage power supply module (101) includes a fine adjusting power supply component (110) and a plurality of coarse adjusting power supply components (120-1 to 120-N) connected in series, wherein one high-voltage output terminal of the high-voltage power supply module (101) is connected to a common terminal of the channel selection circuit (103), and the other high-voltage output terminal of the high-voltage power supply module (101) is grounded through a current sampling resistor.