Resonant Charge Transfer Feedback Control for Output Power Precision
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Solution Overview
Problem
Existing resonant charge transfer devices struggle to achieve precise desired output power due to deviations in circuit parameters such as temperature and operating point, leading to inefficiencies in power conversion.
Innovation Solution
A controlled resonant charge transfer device with a feedback control system that monitors and adjusts switch times and voltage ratios using a digital signal processor and programmable logic device to ensure accurate power conversion, incorporating a first and second filter section, switch sections, and a charge storage device to compute and apply correction parameters for optimal output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If predetermined switch times are used based on nominal parameter values, then the device structure remains simple, but the output power precision deteriorates due to parameter deviations from temperature and operating point variations
Solution Approach 1:
The patent implements a feedback control system that continuously monitors actual circuit parameters (such as capacitor voltages and inductor currents) and compares them against reference values. Based on this feedback, the control system dynamically adjusts switch timing to compensate for parameter deviations caused by temperature and operating point variations, thereby maintaining precise output power control without requiring overly complex hardware modifications
Solution Approach 2:
The control system transitions from static predetermined switch times to dynamic switch timing that adapts in real-time to changing operating conditions. The switch timing is continuously adjusted based on measured parameter deviations, allowing the system to maintain optimal performance across varying temperature and load conditions while keeping the overall device structure relatively simple
2Manufacturing precision
If feedback control is implemented to monitor and adjust switch times, then output power precision is improved, but device complexity increases due to additional control circuitry and monitoring requirements
Solution Approach 1:
The patent employs feedback control where actual measurements of circuit parameters (capacitor voltages, inductor currents) are fed back to the control system. This feedback loop enables automatic adjustment of switch timing to maintain precise output power control. The feedback mechanism uses standard measurement circuits and conventional control algorithms, avoiding the need for complex specialized hardware while achieving the desired precision
Solution Approach 2:
The control system performs self-adjustment by automatically detecting parameter deviations and correcting switch timing without external intervention. The system monitors its own operating parameters and autonomously compensates for variations, eliminating the need for manual calibration or complex external control infrastructure, thereby reducing overall system complexity while maintaining high precision
3Power
If resonant charge transfer is used for power conversion, then power density is improved, but control precision deteriorates due to sensitivity to circuit parameter variations
Solution Approach 1:
The patent applies dynamic control to the resonant charge transfer process by continuously adjusting switch timing based on real-time parameter measurements. Instead of using fixed timing, the system adapts the charging and discharging intervals to compensate for parameter variations, maintaining both high power density and precise output control throughout operation
Solution Approach 2:
The control system actively manages circuit parameters by adjusting switch timing to compensate for natural parameter drifts in the resonant circuit. By changing the timing parameters dynamically rather than maintaining fixed values, the system offsets the effects of temperature and operating point variations on the resonant frequency and impedance, preserving both power density and control precision
Data Source
AI summary
Methods and devices for achieving a desired output in a resonant charge transfer device are given. In an exemplary embodiment a controlled resonant charge transfer device comprises first and second filter sections, first and second switch sections, a charge storage device, and a feedback control system. A method for controlling this device is given, the method comprising specifying a desired output and a desired charge storage voltage ratio; turning on first switches at first switch times and second switches at second switch times; measuring an actual output of the device and one or more parameters of the resonant circuit; determining an actual charge storage voltage ratio; computing corrected first switch times and corrected second switch times; on a subsequent operation cycle of the resonant charge transfer device, turning on the first switches at the corrected first switch times and the second switches at the corrected second switch times.