CT Bias Voltage Circuit for Controlled UPS Changeover
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Solution Overview
Problem
Computed tomography systems face challenges in maintaining continuous bias voltage supply to photon counting detectors, leading to prolonged thermal equilibrium recovery and increased costs due to power failures, which existing solutions address inadequately with large and resource-intensive power buffers.
Innovation Solution
A power supply circuit with a stationary uninterruptible power supply, a co-rotating bias voltage supply, and an auxiliary voltage source with a power buffer, where a bias voltage monitoring unit activates or deactivates the supply based on input voltage thresholds, using a smaller power buffer to maintain controlled voltage transitions and reduce resource consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power buffer is added to the bias voltage supply to maintain voltage during changeover, then the bias voltage continuity is improved, but the device complexity and space requirements increase significantly
Solution Approach 1:
The power supply system is divided into two independent power buffers: a first power buffer in the stationary power distributor and a second power buffer in the co-rotating bias voltage supply. This segmentation allows each buffer to handle only a portion of the total power requirement, reducing the size and complexity of individual buffers while maintaining overall voltage continuity during changeover between grid and UPS power sources
Solution Approach 2:
The first power buffer in the stationary power distributor acts as an intermediary that supplies power to the second power buffer in the co-rotating bias voltage supply during changeover. This intermediary arrangement allows the stationary buffer to support the rotating buffer, enabling voltage maintenance without requiring the rotating buffer to handle the full power load alone
2Stability of the object's composition
If a large power buffer is used to maintain bias voltage during changeover, then voltage stability is improved, but the space and resource requirements increase
Solution Approach 1:
The total power buffering requirement is segmented between a stationary first power buffer and a rotating second power buffer. The first buffer handles the bulk power storage in the stationary domain, while the second buffer provides localized voltage support in the rotating domain, reducing the space required in the constrained rotating space of the CT system
3Adaptability or versatility
If the bias voltage supply is interrupted during power failure, then the system can respond to power changes, but the detector requires long recovery time and calibration
Solution Approach 1:
Both the first and second power buffers are pre-charged during normal grid operation to store sufficient energy. When a power failure occurs and the system switches to UPS power, these pre-charged buffers immediately discharge to maintain the bias voltage without interruption, allowing the detector to remain in its operational state without requiring recovery time or recalibration
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 ensures continuous operation during power failures with reduced resource and space requirements, preventing uncontrolled voltage changes and minimizing wear on system components, while maintaining efficient power usage.
Implementation Method 1
capacitors with large dimensions are required to store sufficient power in order to maintain the bias voltage
Implementation Method 2
the bias voltage includes a sensor configure to detect the electrical input voltage at the voltage supply input
Data Source
AI summary
One or more example embodiments relates to a power supply circuit for a computed tomography system. The power supply circuit comprises a stationary power distributor including an uninterruptible power supply; a co-rotating bias voltage supply, the co-rotating bias voltage supply including a voltage supply input, a bias voltage supply output, and a bias voltage monitoring unit, the bias voltage monitoring unit being configured to activate or to deactivate the bias voltage supply output as a function of an electrical input voltage detected at the voltage supply input, and the bias voltage includes a sensor configure to detect the electrical input voltage at the voltage supply input; and an auxiliary voltage source having a power buffer, the power buffer configured to supply the bias voltage monitoring unit with electrical power for deactivation of the bias voltage supply output.