Resonant Converter Phase Shifting Control Multi-Output Regulation
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Solution Overview
Problem
Conventional multi-output DC/DC converters face challenges in achieving high efficiency, high voltage stability, and small size to meet the 80 PLUS Gold standard, particularly due to switching losses and cross regulation issues in existing circuit topologies like ACF and LLC circuits.
Innovation Solution
A resonant converter with a phase shifting output circuit combines LLC and DAB circuits to achieve high power density and independent voltage regulation, utilizing a resonant capacitor, inductor, and parallel inductor configuration with phase shifting control to enhance efficiency and reduce losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional PWM controlled ACF circuit is used to achieve ZVS, then switching loss is reduced, but cross regulation problem occurs and efficiency cannot meet high standards
Solution Approach 1:
The patent combines LLC resonant circuit and DAB phase shifting circuit into a single integrated converter system. The LLC circuit provides soft switching for reduced losses, while the DAB circuit enables independent regulation of multiple outputs through phase shifting control, resolving the cross-regulation problem of conventional ACF circuits.
Solution Approach 2:
The integrated converter serves multiple functions: it provides soft switching for efficiency, enables independent multi-output regulation, and maintains voltage stability across different loading conditions. The single system performs what previously required separate circuits, achieving both high efficiency and reliable cross-regulation.
2Quantity of substance
If input voltage range is enlarged to reduce capacitor capacitance, then power density increases, but topology selection and circuit design become more difficult
Solution Approach 1:
The patent utilizes resonant frequency and phase shifting angle as controllable parameters to adapt the circuit operation across a wide input voltage range. By changing these parameters dynamically, the converter maintains stable operation without requiring complex topology changes or large capacitor values, thus increasing power density while managing design complexity.
3Device complexity
If conventional hard switching is used in converter, then circuit structure is simple, but switching loss is great and efficiency is low
Solution Approach 1:
The patent employs resonant oscillation in the LLC circuit to create soft switching conditions. The resonant inductor and capacitor generate oscillating currents and voltages that enable switches to turn on and off at optimal moments (zero voltage or zero current), dramatically reducing switching losses while maintaining a relatively simple circuit structure.
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 solution achieves higher efficiency, reduced losses, and accurate voltage stability across multiple outputs, enabling a wider voltage range without sacrificing normal operation efficiency, thus addressing the limitations of conventional circuits.
Implementation Method 1
a resonant circuit (1) to receive an input power and regulate to become at least one resonant power
Implementation Method 2
a parallel inductor (13) bridged between the resonant inductor (12) and the power transformation circuit (2) in a parallel manner
Data Source
AI summary
A resonant converter equipped with a phase shifting output circuit includes a resonant circuit to receive input power and regulate to become at least one resonant power, a switch unit to switch an ON period for the input power to pass through the resonant circuit and a power transformation circuit to regulate the resonant power and output a transformed power. The resonant converter further has a primary output circuit and at least one secondary output circuit. The primary output circuit regulates the transformed power to become a primary output power. A resonant control unit captures a feedback signal from the primary output circuit and generates a resonant control signal. A phase shifting control unit receives the resonant control signal and regulate to become a phase shifting driving signal. The secondary output circuit is controlled by the phase shifting driving signal and provides a secondary output power.