High Voltage Regulator Feedforward Control for Load Stability
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Solution Overview
Problem
High voltage power supplies in devices like radiation generators face challenges in maintaining voltage stability due to rapid changes in load current, which can cause damage to the system and affect radiation output, as existing control loops respond too slowly to such changes.
Innovation Solution
A method that involves monitoring the voltage output and load current to generate error and feedforward signals, which are used in a voltage control loop to adjust the drive signal, anticipating and mitigating the effects of load changes by incorporating parameters like output impedance and environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a traditional feedback control loop is used to regulate high voltage output, then the system can maintain voltage stability under normal conditions, but it cannot respond quickly enough to rapid load changes, causing voltage overshoot or droop that may damage components or affect radiation output
Solution Approach 1:
The patent applies preliminary action by using a feedforward control path that anticipates load changes before they affect the high voltage output. The controller receives load change signals and generates compensating drive signals in advance, adjusting the power supply output proactively rather than reactively. This allows the system to prepare for and counteract voltage deviations before they occur, resolving the contradiction between response speed and voltage stability.
2Stability of the object's composition
If the high voltage power supply operates with high output impedance to improve voltage regulation, then it can maintain stable voltage under constant load, but it becomes more susceptible to voltage overshoot when load changes occur rapidly
Solution Approach 1:
The patent applies preliminary anti-action by introducing a feedforward control path that generates compensating signals in opposition to anticipated load changes. When a load change is detected, the controller produces a drive signal adjustment that counteracts the impending voltage deviation caused by the load change and high output impedance. This proactive counter-action prevents voltage overshoot and protects the insulation system before harmful effects can occur.
3Device complexity
If the high voltage power supply uses a simple Cockcroft-Walton voltage multiplier design, then the device complexity is reduced, but the system lacks the capability to rapidly respond to load changes and maintain precise voltage control
Solution Approach 1:
The patent applies the intermediary principle by introducing a controller as a mediating component between the simple Cockcroft-Walton voltage multiplier and the load. The controller receives load change signals and generates adjusted drive signals that compensate for load variations, enabling the simple voltage multiplier design to achieve rapid response and precise voltage control without increasing the complexity of the core power supply structure.
Data Source
AI summary
A method for regulating output of a high voltage generator includes monitoring a voltage output of the generator and comparing it to a voltage setpoint to generate an error signal. A load on the generator is monitored to generate a load signal. The load signal is conducted to a feedforward signal generator. The feedforward signal generator is configured to produce a feedforward signal corresponding to the load and to at least one parameter related to an output impedance of the high voltage generator. The error signal is conducted to a high voltage regulation loop. The control loop output and the feedforward signal generator output are coupled to a driver for the high voltage generator.