BST Capacitor Control Circuit with Adaptive Feedback
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Solution Overview
Problem
BST capacitors with adjustable capacitance require significant time to reach target capacitance values due to their inherent time constant, leading to prolonged intervals for functional application and switching, and existing control circuits may cause overvoltages when attempting to accelerate this process, risking unauthorized capacitance variations.
Innovation Solution
A control circuit with an output stage featuring a high-voltage amplifier and a resistive and capacitive feedback cell, where the resistive and capacitive cell is sized to match the time constant of the BST capacitor, allowing for faster adjustment of bias voltage and reducing the time interval to reach target capacitance, and incorporating a network of switchable capacitances to adapt to different capacitor types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a BST capacitor is used with adjustable capacitance, then the device can be adapted to the outer environment, but the capacitor requires significant time to reach target capacitance values due to its inherent time constant
Solution Approach 1:
The patent applies dynamics by making the feedback loop adjustable through switchable resistive elements. The control circuit can dynamically change the feedback characteristics to optimize both the speed of capacitance adjustment and the final accuracy, resolving the contradiction between adaptability and response time.
Solution Approach 2:
The patent changes parameters by introducing switchable resistive elements in the feedback loop that can alter the feedback factor. This allows the system to adjust the time constant of the control circuit to match or exceed the BST capacitor's time constant, enabling faster settling while maintaining adaptability.
2Speed
If existing control circuits attempt to accelerate the capacitance adjustment process, then the switching speed improves, but overvoltages occur that risk unauthorized capacitance variations
Solution Approach 1:
The patent applies feedback by incorporating a feedback loop with switchable resistive elements that monitors and controls the bias voltage applied to the BST capacitor. This feedback mechanism ensures that the capacitance adjustment remains within authorized ranges while achieving faster switching speeds, preventing overvoltages and unauthorized variations.
Solution Approach 2:
The dynamic adjustment of feedback resistance values allows the control circuit to optimize the balancing between response speed and control precision. By dynamically changing the feedback characteristics, the system achieves fast switching while maintaining reliability and preventing unauthorized capacitance variations.
3Measurement precision
If a dedicated control circuit with high-voltage digital-to-analog conversion is used, then the capacitance can be precisely controlled, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing a control circuit that can work with different types of BST capacitors through switchable resistive elements. This multi-functional approach allows the same control circuit architecture to precisely control various capacitors with different time constants, maintaining precision while reducing overall system complexity through component sharing.
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
This solution significantly reduces the time interval to reach target capacitance values, enhancing the speed and accuracy of BST capacitor control while preventing overvoltages, thus improving the efficiency and reliability of BST capacitor-based applications.
Implementation Method 1
a capacitor having a capacitance adjustable by biasing
Implementation Method 2
the resistive and capacitive cell is sized according to a time constant of the capacitor of adjustable capacitance
Data Source
AI summary
A circuit for controlling a capacitor having a capacitance adjustable by biasing, including an amplifier for delivering a D.C. bias voltage, having a feedback slowed down by a resistive and capacitive cell.