Variable Magnetizing Inductor DC-DC Converter Light-Load Efficiency
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Solution Overview
Problem
Conventional DC-to-DC power converters experience reduced efficiency at light-load conditions due to increased switching frequency, leading to higher switching losses.
Innovation Solution
A power converting device incorporating a switching unit, resonant unit, converting unit, rectifying and filtering unit, inductance-sensing unit, and driver, where the inductance-sensing unit dynamically adjusts the switching frequency based on the inductance of a variable magnetizing-inductor with multiple inductances to minimize switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the switching frequency is increased to stabilize output voltage under light-load condition, then the output voltage stability is improved, but the switching losses increase and efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the magnetizing inductance variable rather than fixed. The magnetizing inductor is designed with characteristics that allow its inductance to change dynamically based on operating conditions. Under light-load conditions, the variable inductance increases, which allows the switching frequency to be reduced while maintaining output voltage stability, thereby reducing switching losses and improving efficiency.
Solution Approach 2:
The patent changes the parameter of magnetizing inductance from a fixed value to a variable value that changes with operating conditions. By adjusting the magnetizing inductance parameter according to load conditions, the system can operate at lower switching frequencies under light-load conditions while maintaining stable output voltage, thus resolving the contradiction between voltage stability and switching losses.
2Device complexity
If a fixed inductance is used in the resonant circuit, then the circuit structure is simple, but the switching frequency must be increased under light-load condition leading to higher switching losses
Solution Approach 1:
The patent transforms the static fixed inductance into a dynamic variable inductance. The magnetizing inductor is designed to exhibit variable inductance characteristics that automatically adjust with operating conditions. This dynamic property allows the system to reduce switching frequency under light-load conditions without complicating the overall circuit structure, as the variable inductance is inherent to the magnetizing inductor design rather than requiring additional active control components.
Solution Approach 2:
The patent changes the inductance parameter from fixed to variable. The magnetizing inductor is specifically designed with a magnetic core and winding structure that provides variable inductance based on the operating point. This parameter change enables the resonant circuit to maintain proper operation across different load conditions without requiring complex external control mechanisms, thus reducing switching losses while keeping the circuit structure relatively simple.
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
This configuration enhances light-load efficiency by reducing switching losses and stabilizing output voltage, as demonstrated by improved frequency response characteristics.
Implementation Method 1
The pulsating signal then is transmitted to a resonant tank constructed by the first capacitor C1, the first inductor L1 and the second inductor L2 for generating resonant
Implementation Method 2
The inductance-sensing unit instantaneously senses inductances of the variable magnetizing-inductor
Data Source
AI summary
A power converting device includes a switching unit, a resonant unit, a converting unit, a rectifying and filtering unit, an inductance-sensing unit, and a driver. The resonant unit is electrically connected to the switching unit and includes a resonant capacitor, a resonant inductor, and a variable magnetizing-inductor having at least two inductances, the resonant inductor is electrically connected to the resonant capacitor and the variable magnetizing-inductor. The converting unit is electrically connected to the resonant unit. The rectifying and filtering unit is electrically connected to the converting unit. The inductance-sensing unit is electrically connected to the rectifying and filtering unit, the inductance-sensing unit instantaneously senses inductances of the variable magnetizing-inductor. The driver is electrically connected to the inductance-sensing unit and the switching unit, the driver is configured for controlling a switching frequency of the switching unit according to an inductance instantaneously sensed by the inductance-sensing unit.