Variable-Capacitance Power Converter for Load Impedance Adaptation
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Solution Overview
Problem
Conventional electrical energy converters struggle to maintain efficient energy conversion when load impedance changes, as they are typically configured for fixed output voltage or power, leading to degraded performance when faced with variable impedance loads.
Innovation Solution
An electrical energy converter with a capacitive circuit of variable and controllable capacity, connected between the inverter and the load, allows for regulation of output parameters such as voltage, current, or power, along with an impedance adaptation block and a regulation block that ensures zero voltage switching, enabling adaptation to changing load impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the converter is configured for fixed output voltage or power, then the operation is simplified and stable, but the performance degrades when load impedance changes
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed capacitive circuit into a variable one. The capacitor value can be dynamically adjusted based on load impedance changes, allowing the converter to adapt its output parameters (voltage, current, or power) while maintaining operational stability. This is achieved through a control system that modifies the capacitance value in response to detected load conditions.
Solution Approach 2:
The patent implements parameter changes by varying the capacitance value of the capacitive circuit. By changing this key electrical parameter, the converter can regulate its output characteristics to match different load impedance conditions, thereby improving adaptability without sacrificing reliability.
2Loss of energy
If the transistor switching duty cycle is adjusted for zero voltage switching at a given load impedance, then energy conversion efficiency is optimized, but any modification of load impedance induces degraded efficiency
Solution Approach 1:
The patent employs feedback by implementing a control system that continuously monitors load impedance and adjusts the capacitive circuit accordingly. This closed-loop approach ensures that zero voltage switching conditions are maintained across varying load conditions, preserving energy conversion efficiency while adapting to impedance changes.
Solution Approach 2:
The dynamic adjustment of the capacitive circuit allows the system to maintain optimal switching conditions despite load variations. By making the capacitance variable rather than fixed, the converter can continuously adapt to maintain zero voltage switching and high efficiency across different operating points.
3Adaptability or versatility
If a capacitive circuit of variable capacity is added to enable output parameter regulation, then adaptability to load changes is improved, but device complexity increases
Solution Approach 1:
The patent changes the parameter of capacitance from fixed to variable, enabling output parameter regulation. This single parameter change provides the adaptability needed to handle varying load conditions without requiring complex multi-component circuits.
Solution Approach 2:
The variable capacitive circuit serves multiple functions: it regulates output voltage, current, or power, adapts to load impedance changes, and maintains zero voltage switching conditions. This multi-functionality is achieved through a single adjustable component rather than multiple dedicated circuits.
Data Source
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AI summary
The invention relates to an electrical power converter comprising an inverter (10) for obtaining alternating electrical power from a direct current electrical power source. The inverter includes a switch (52) having first and second conduction terminals for receiving an alternating voltage, the electrical power converter being adapted to supply output electrical power to a load (8). This converter includes a variable and controllable capacitive circuit (14) connected between the inverter (10) and the load (8), a change in said capacitance resulting in a change in an electrical output parameter of the converter.The associated electrical power conversion system includes such an electrical power converter and a control module (16) configured to receive as input a setpoint value of said electrical output parameter (Vref) of the converter and to control the variable capacitance of said capacitive circuit (14) as a function of this setpoint value.