Multi-Phase DC/DC Boost Converter Ripple Reduction
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Solution Overview
Problem
Existing DC/DC boost converters face high production costs due to high current/voltage ratings required for components, significant electromagnetic interference leading to energy loss, and reduced switch lifetime from high-frequency switching operations.
Innovation Solution
A DC/DC boost converter employing a multi-phase operation mechanism with multiple boost driving units connected in parallel, where energy-storing and energy-releasing operations are alternately performed to charge a capacitor, reducing the ripple of the output voltage and allowing for components with lower current/voltage ratings, thereby mitigating electromagnetic interference and extending switch lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-phase boost operation is used, then the converter structure is simple, but high current/voltage rating components are required leading to high production cost
Solution Approach 1:
The single-phase boost converter is segmented into multiple parallel boost driving units (first, second, and third units), each handling a portion of the total power. This segmentation allows each unit to use components with lower current/voltage ratings, reducing production cost while maintaining the required total power output capability.
2Device complexity
If single-phase boost operation is used, then the converter structure is simple, but significant electromagnetic interference occurs causing energy loss
Solution Approach 1:
The power conversion process is segmented across three parallel boost driving units that operate with phase-shifted control signals. This segmentation distributes the ripple current across multiple units, reducing the peak ripple current in each inductor and thereby decreasing electromagnetic interference and associated energy losses.
Solution Approach 2:
The three boost driving units operate with periodic, phase-shifted switching cycles. By staggering the switching timing of each unit, the ripple currents are distributed over time, reducing the overall electromagnetic interference and energy loss compared to a single-phase operation.
3Speed
If high-frequency switching operation is used, then the converter responds quickly, but switch lifetime deteriorates
Solution Approach 1:
The high-frequency switching burden is segmented across three parallel boost driving units. Each unit operates at a lower effective switching frequency since they are phase-shifted, reducing the stress on individual switches while maintaining the overall high-frequency response capability of the converter through their combined operation.
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 multi-phase operation reduces the ripple of the output voltage, lowers the current through components, decreases electromagnetic interference, and extends the lifetime of switches by reducing switching frequency, resulting in a more efficient and cost-effective energy conversion process.
Implementation Method 1
the energy-storing operation of the inductor 110 is performed by a current flowing through the power switch 120
Implementation Method 2
the energy-releasing operation of the inductor 110 is employed to charge the output capacitor 180 via the power diode 130
Implementation Method 3
high capacitance of the output capacitor 180 is required to reduce the ripple of the output voltage Vout
Data Source
AI summary
A DC/DC boost converter includes a first boost driving unit, a second boost driving unit connected in parallel with the first boost driving unit, and a capacitor electrically connected to the first and second boost driving units. The first boost driving unit is utilized for performing a first driving operation according to an input voltage and a first control signal. The first driving operation includes a first energy-storing operation and a first energy-releasing operation. The second boost driving unit is utilized for performing a second driving operation according to the input voltage and a second control signal different from the first control signal. The second driving operation includes a second energy-storing operation and a second energy-releasing operation. The first and second energy-releasing operations are employed to alternately charge the capacitor for generating an output voltage.