Boost Converter Clamping Unit Reduces Voltage Stress
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Solution Overview
Problem
Conventional boost converters face challenges in achieving high boost ratios while maintaining power conversion efficiency and reducing manufacturing costs, often requiring separate loss snubber circuits that increase costs and reduce efficiency.
Innovation Solution
A boost converter design that includes a transformer with a preset turn ratio, a switching unit, a stabilizing unit with an output diode, and a clamping unit that uses a first diode and capacitor to clamp the voltage applied to the output diode, corresponding to the difference between input and output voltages, thereby reducing voltage stress without a separate loss snubber circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a plurality of boost converters are connected in series to obtain high boost ratio, then the boost ratio is improved, but power conversion efficiency is reduced and unit costs increase due to increase in number of components
Solution Approach 1:
The patent divides the voltage boosting function into two parts: the transformer provides voltage transformation through its turn ratio, while the clamping circuit handles the voltage stress management. This segmentation allows a single boost converter to achieve high boost ratio without needing multiple converters in series, thereby maintaining power conversion efficiency.
2Reliability
If a loss snubber circuit is used to reduce surge voltage, then voltage stress is reduced, but power conversion efficiency is reduced and manufacturing costs increase
Solution Approach 1:
The patent merges the voltage clamping function with the output rectification function by using the output diode as part of the clamping mechanism. The clamping circuit is integrated into the existing output stage, eliminating the need for a separate loss snubber circuit while maintaining voltage stress reduction and preserving power conversion efficiency.
Solution Approach 2:
The output diode serves dual functions: it performs output rectification and simultaneously acts as part of the voltage clamping mechanism. This multi-functionality eliminates the need for dedicated snubber components, reducing both cost and energy loss while maintaining reliability.
3Reliability
If element with high voltage resistance is used to withstand surge voltage, then voltage stress is managed, but manufacturing costs increase
Solution Approach 1:
The patent implements prior cushioning by providing a clamping circuit that prevents voltage stress from reaching harmful levels in the first place. The clamping voltage is set to correspond to the difference between input and output voltages, ensuring that elements only need to withstand normal operating voltages rather than surge voltages, thus reducing component costs.
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 design reduces voltage stress on elements, decreases the duty ratio, and increases power conversion efficiency, achieving a higher boost ratio without the need for additional snubber circuits.
Implementation Method 1
a transformer including a primary winding receiving an input power and a secondary winding electromagnetically coupled to the primary winding and having a preset turn ratio therewith
Implementation Method 2
a first capacitor having one end connected to the cathode of the first diode and the other end connected to the other end of the secondary winding
Data Source
AI summary
There is provided a boost converter capable of reducing voltage stress within each element thereof, without using a separate loss snubber circuit, by clamping a voltage applied to an output diode to correspond to a difference between an input voltage and an output voltage. The boost converter includes a transformer including a primary winding receiving an input power and a secondary winding electromagnetically coupled to the primary winding and having a preset turn ratio therewith; a switching unit switching the input power transferred to the primary winding on and off according to a preset duty ratio; a stabilizing unit including an output diode rectifying the power outputted from the secondary winding to stabilize an output power; and a clamping unit clamping a voltage applied to the output diode to correspond to a difference between the input power and the output power during a switching on operation of the switching unit.