Virtual Impedance Loop for Resonant Power Conversion
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Solution Overview
Problem
High-frequency resonant power conversion systems face challenges in maintaining efficiency due to fluctuating parameters in components, requiring either frequency adjustments or the addition of physical variable components, which are cumbersome, inaccurate, or not applicable in all cases, especially in high-power systems where frequency changes are restricted.
Innovation Solution
A virtual impedance creation loop is used to compensate for parameter fluctuations by calculating and implementing a virtual component that adjusts the amplitude and phase of the oscillator, eliminating the need for physical component changes and frequency modifications, thereby maintaining controlled variables like current, voltage, or phase difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If variable capacitors or inductors are used to return the circuit to resonance when component parameters fluctuate, then the system can maintain resonance, but the device complexity increases and the solution becomes cumbersome
Solution Approach 1:
The patent creates a virtual copy of the fluctuating component's impedance effect through software control of the oscillator. Instead of adding physical variable components, the system calculates the required compensation and implements it by adjusting the oscillator's output characteristics, thereby copying the effect of a physical component without the physical hardware
Solution Approach 2:
The patent replaces the mechanical/physical system of variable capacitors or inductors with an electronic/software-based control system. The virtual impedance compensation is achieved through digital signal processing and oscillator control, substituting physical component adjustment with electronic control mechanisms
2Reliability
If the frequency of the oscillator is changed to return the circuit to resonance, then the system can compensate for parameter fluctuations, but this is not applicable when frequency changes are restricted by regulations
Solution Approach 1:
The patent changes the approach from modifying frequency to modifying the impedance characteristics at a fixed frequency. By adjusting the oscillator's amplitude and phase relationships, the system creates a virtual impedance that compensates for component fluctuations without changing the operating frequency, thereby maintaining adaptability under frequency restrictions
3Reliability
If physical variable components are added to compensate for parameter fluctuations, then resonance can be maintained, but the ease of operation deteriorates due to cumulative errors and inaccuracy
Solution Approach 1:
The patent implements a feedback control mechanism where the system continuously monitors the actual impedance or operating conditions and dynamically adjusts the oscillator's output to maintain the desired resonance condition. This closed-loop control eliminates cumulative errors and maintains high accuracy by constantly correcting deviations
Solution Approach 2:
The patent calculates and applies the necessary compensation in advance based on predicted or measured parameter fluctuations. By determining the required virtual impedance adjustment before significant deviations occur, the system prevents errors rather than correcting them, improving operational accuracy
Data Source
AI summary
A high-frequency resonant power conversion system for transferring power from an oscillator to a load or vice-versa, the system including components with at least one fluctuating parameter and is configured to control the value of a defined variable selected from: a certain current, a certain voltage, a phase difference between a certain voltage and a certain current, and a certain power; the system further including a virtual impedance creation loop which is configured to create a virtual component, the virtual component forming a basis for changing amplitude and a phase of the oscillator, thereby to compensate for a deviation from the controlled variable due to the fluctuations.