Buck Converter Voltage-Shift Circuit for Lower Switching Loss
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Solution Overview
Problem
Traditional inductor-based buck converters suffer from significant switching and conduction losses, particularly at high conversion rates, necessitating a solution for improved power efficiency.
Innovation Solution
A buck converter design incorporating a voltage shift component and discharging branch to regulate the inductor, which suppresses switching and conduction losses by operating at lower voltages and dividing the inductor current, using a limited number of switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional inductor-based buck converter operates at high conversion rate, then voltage stepping down function is achieved, but switching loss and conduction loss increase significantly
Solution Approach 1:
The patent segments the single inductor current path into two separate paths by introducing a second inductor. The first inductor handles charging current while the second inductor handles discharging current, thereby reducing conduction losses and enabling more efficient power conversion with reduced switching and conduction losses
Solution Approach 2:
The patent introduces a capacitor as an intermediary energy storage element that works in conjunction with the two inductors. This capacitor mediates the energy transfer between input and output, allowing for reduced switching losses by providing an additional energy storage and transfer mechanism
2Loss of energy
If voltage shift component is used to reduce switching loss, then power efficiency improves, but device complexity increases
Solution Approach 1:
The voltage shift capacitor serves multiple functions simultaneously: it reduces switching loss by providing an intermediate voltage level, stores energy during switching transitions, and helps regulate the operating voltage of the switches. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in circuit complexity
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 proposed design significantly reduces switching and conduction losses, enhancing power efficiency by up to half compared to conventional converters, with improved duty cycle management and reduced voltage ripple.
Implementation Method 1
The inductor is charged and discharged to regulate the output voltage
Implementation Method 2
The voltage shift component shifts the input voltage to a lower level to charge the inductor
Data Source
AI summary
A buck converter with high power efficiency is shown, which converts an input voltage to an output voltage. The buck converter has an inductor, a voltage shift component, a discharging branch, and a voltage shift setting circuit. The inductor is charged and discharged to regulate the output voltage. The voltage shift component shifts the input voltage to a lower level to charge the inductor. The discharging branch is coupled to the inductor when the inductor is discharged. The voltage shift setting circuit converts the output voltage of the buck converter to an expected voltage different from the output voltage. The voltage shift setting circuit is configured to provide the expected voltage to charge the voltage shift component during a discharging phase of the inductor.