Boost Rectifier Circuit With Equal-Duty Switching and Low Loss
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Solution Overview
Problem
Conventional DC power-supply devices face challenges in achieving high boost ratios with increased switching frequency, leading to higher switching losses and complex control methods, and require changes in switching control based on boost ratio adjustments.
Innovation Solution
A DC power-supply device configuration that includes a rectifying circuit, a first reactor, a capacitor group, and a switching element group, where the on-duty of the first and second switching elements is controlled to be equal, and a second reactor with a smaller inductance value than the first reactor, allowing for efficient boosting of output voltage without increasing switching frequency and simplifying control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the switching frequency is increased to achieve a high boost ratio, then the boost ratio is improved, but the switching loss is increased
Solution Approach 1:
The patent divides the switching element group into multiple switching elements (first switching element and second switching element) that can be controlled independently with different on-duties. This segmentation allows the system to achieve high boost ratios by distributing the switching actions across multiple elements, thereby reducing the switching frequency and switching loss for each individual element while maintaining the overall high boost ratio performance.
2Adaptability or versatility
If the switching control method is changed to achieve different boost ratios, then the boost ratio is adjusted, but the control complexity is increased
Solution Approach 1:
The patent implements dynamic control by independently adjusting the on-duties of the first and second switching elements based on the required boost ratio. The control unit dynamically modifies the on-duty ratios to achieve different boost ratios without changing the fundamental switching control method, thereby maintaining simplicity while providing adaptability for various operating conditions.
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 enables a high boost ratio with reduced switching losses and easier control, achieving a DC voltage twice as high as the power-supply voltage while maintaining low-cost implementation and improving power factor and harmonic current suppression.
Implementation Method 1
a rectifying circuit, connecting rectifying diodes in a full-bridge configuration, rectifies single-phase or three-phase AC commercial power
Implementation Method 2
store energy in a reactor provided at the previous stage or the subsequent stage of the rectifying circuit
Implementation Method 3
charge a capacitor with this energy, which is connected in parallel to the switching element group
Data Source
AI summary
A first reactor is provided on the input side of a rectifying circuit that rectifies AC power (on the side of an AC power supply), and on the output side of the rectifying circuit (on the side of a load), first and second capacitors that are connected in series to each other, and first and second switching elements that switch between charging and not charging of the first and second capacitors, respectively, are provided, a second capacitor group in Y-connection, provided with three capacitors, each of which is connected to each phase-terminal of the first reactor on the side of the rectifying circuit, is connected to the midpoint of the first and second switching elements, and the output voltage to the load is boosted, while the on-duty of the first switching element and the on-duty of the second switching element are controlled to be equal to each other.