Resonant DC/DC Converter Voltage Control via Real-Time Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Resonant DC/DC converters for high-voltage applications, such as x-ray tubes, face challenges in providing precise voltage control due to instability in the resonant tank circuit parameters and nonlinearities, leading to variations in output voltage and current.
Innovation Solution
A hypo resonant DC to DC converter that monitors voltage and current in real-time to control the switching of semiconductors, using a controller circuit to adjust the timing of the switch array based on measured values, ensuring stability and accommodating parameter changes, with a switching frequency below the resonant frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resonant DC/DC converter parameters are stabilized, then voltage control precision is improved, but device complexity increases due to real-time monitoring and control circuitry
Solution Approach 1:
The patent implements real-time feedback control by monitoring the resonant tank circuit parameters (inductance L and capacitance C) and adjusting the switching frequency accordingly. The controller continuously measures the actual resonant frequency and modifies the switching frequency to maintain operation at the resonant peak, compensating for parameter drift and ensuring precise voltage control despite component aging or environmental changes.
Solution Approach 2:
The patent dynamically changes the switching frequency parameter based on real-time measurements of the resonant tank circuit's actual resonant frequency. By adjusting the switching frequency to track the resonant frequency, the system maintains optimal operation and precise voltage control even as other parameters (like inductance or capacitance) change over time due to aging, temperature, or load variations.
2Stability of the object's composition
If switching frequency is reduced below resonant frequency, then stability is improved, but conversion efficiency decreases
Solution Approach 1:
The patent transitions from a static switching frequency approach to a dynamic one, where the switching frequency is continuously adjusted based on real-time measurements of the resonant tank circuit's actual resonant frequency. This dynamic adaptation allows the system to maintain operation at or near the resonant frequency despite parameter drift, achieving both stability and high efficiency by ensuring the switching frequency always matches the current resonant conditions.
Solution Approach 2:
The system uses real-time feedback from voltage and current sensors to detect changes in the resonant frequency and adjusts the switching frequency accordingly. This feedback mechanism ensures the converter operates at the optimal resonant frequency, maintaining both voltage stability and high conversion efficiency by preventing operation in the non-resonant region where efficiency would degrade.
3Measurement precision
If real-time monitoring of resonant circuit is implemented, then control precision is improved, but measurement and detection difficulty increases
Solution Approach 1:
The patent introduces an intermediary measurement approach by using the existing voltage and current waveforms in the resonant tank circuit as indirect indicators of the resonant frequency. Instead of directly measuring inductance or capacitance values, the system analyzes the phase relationship and frequency characteristics of the voltage and current signals, which are easily obtainable through standard sensors. This intermediary method simplifies the measurement task while providing sufficient information for precise control.
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 approach enhances stability and control of the resonant circuit, allowing for precise voltage regulation and efficient operation under varying conditions, reducing nonlinearities' impact and improving overall converter performance.
Implementation Method 1
the semiconductor devices produce a synthesized AC signal that is applied to a tank circuit (for example, a series resonant inductor and capacitor) to excite that tank circuit in the oscillation
Data Source
AI summary
In the present invention, a high-voltage DC/DC converter suitable for powering x-ray tubes and the like provides control of a voltage applied to a resonant circuit at least in part according to a timing of a monitored voltage on the resonator thereby compensating for variations in the parameter stability of the resonant circuit, nonlinearity in the resonant gain curve and frequency dependencies.