Switched-Capacitor Converter Resonance Tracking for Efficient Switching
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Solution Overview
Problem
Conventional switched-capacitor DC-DC converters face efficiency issues due to component degradation over time, which changes the resonant frequency and impairs voltage conversion efficiency, leading to hard switching and reduced power conversion efficiency.
Innovation Solution
A power supply system comprising a switched-capacitor converter, a controller, and a monitor that adjusts control signal frequencies based on determined impedance to maintain optimal operation by identifying and operating at the resonant frequency, ensuring efficient voltage conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If component degradation is allowed to occur over time, then the converter operates continuously, but the resonant frequency changes and efficiency decreases
Solution Approach 1:
The patent implements dynamic adjustment of the switching frequency to track the changing resonant frequency of the converter. The controller continuously monitors impedance and adjusts the switching frequency in real-time, transforming the static frequency operation into a dynamic adaptive system that maintains efficiency despite component degradation over time.
Solution Approach 2:
The patent employs feedback control by monitoring the impedance of the converter and using this information to adjust the switching frequency. The controller receives impedance measurements and automatically modifies the operating frequency to maintain resonance, creating a closed-loop system that compensates for component degradation.
2Device complexity
If the switching frequency is fixed at initial operation, then the control system is simple, but the resonant frequency drift causes hard switching and efficiency loss
Solution Approach 1:
The patent implements feedback control by monitoring the impedance of the converter and using this information to adjust the switching frequency. The controller receives impedance measurements and automatically modifies the operating frequency to maintain resonance, creating a closed-loop system that compensates for component degradation.
Solution Approach 2:
The converter system performs self-diagnosis and self-adjustment by monitoring its own impedance and automatically tuning its switching frequency to maintain resonant operation. The system serves itself by detecting frequency drift and correcting it without external intervention, maintaining efficiency autonomously.
3Reliability
If impedance monitoring and frequency adjustment are implemented, then efficiency is maintained, but the device complexity increases
Solution Approach 1:
The controller performs multiple functions: it monitors impedance, determines resonant frequency, adjusts switching frequency, and controls power conversion. By consolidating these functions into a single multi-functional controller, the patent reduces overall system complexity while maintaining the ability to adapt to component degradation and maintain efficiency.
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
The system maintains high efficiency by continuously adjusting control signals to match the resonant frequency of the switched-capacitor converter, preventing hard switching and ensuring efficient power conversion despite component degradation.
Implementation Method 1
The resonant tank circuit formed by a series connection of an inductor and capacitor has an associated resonant frequency that is based upon the inductance and capacitance of these components. Switching of the switches in the conventional switched-capacitor converter at the respective resonant frequency results in so-called zero current switching (ZCS), which reduces switching losses and provides good power conversion efficiency.
Data Source
AI summary
A power supply system comprises: a switched-capacitor converter, a controller, and a monitor. Via generation of control signals, the controller controls settings of switches in the switched-capacitor converter to convert a received input voltage to an output voltage that powers a load. The monitor in the power supply system at least occasionally determines an impedance associated with the switched-capacitor converter. A magnitude of the determined impedance provides an indication whether the switched-capacitor converter is operating efficiently. To ensure efficient operation of the switched-capacitor converter, based on input form the monitor, the controller adjusts the control signals controlling the switches in the switched-capacitor converter as a function of the determined impedance.