Coupled-Inductor Snubber Circuit for Low-Ripple Boost Conversion
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Solution Overview
Problem
Conventional boost converters experience increased heat generation and reduced efficiency due to charging current ripple, which is exacerbated by hard switching when capacitors and inductors are increased in capacity.
Innovation Solution
A converter design incorporating coupled inductors and a snubber circuit with specific diodes and capacitors to reduce output current ripple, utilizing zero-current switching to minimize heat generation and improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the capacities of the capacitor and inductor are increased to reduce charging current ripple, then the charging current ripple is reduced, but hard switching occurs which reduces efficiency
Solution Approach 1:
The patent divides the single inductor into two coupled inductors (first inductor and second inductor) with different inductance values. This segmentation allows the system to achieve better current ripple reduction while avoiding hard switching, as the coupled inductors can be optimized to work together in soft switching mode.
Solution Approach 2:
The patent changes the parameter configuration by using two inductors with different inductance values rather than a single inductor. The first inductor has a first inductance value and the second inductor has a second inductance value, allowing optimization of both ripple reduction and switching characteristics simultaneously.
2Temperature
If a snubber circuit is added to reduce output current ripple, then heat generation is reduced, but device complexity increases
Solution Approach 1:
The coupled inductors serve multiple functions: they act as energy storage elements for voltage conversion and simultaneously function as a snubber circuit to reduce output current ripple. This multi-functionality reduces heat generation without significantly increasing device complexity, as the same components perform multiple roles.
Solution Approach 2:
The patent merges the voltage conversion function and the ripple reduction (snubber) function into a single coupled inductor structure. By combining these functions, the circuit avoids heat generation from current ripple without requiring separate additional components, thus maintaining simplicity.
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 converter reduces output current ripple by half, thereby reducing heat generation and enhancing efficiency, preventing over-charging and switching losses.
Implementation Method 1
a first inductor connected to a power source at a first node, a second inductor connected to the first inductor at a second node, a third inductor connected in parallel to the first inductor at the first node and the second node... in which the first inductor and the fourth inductor are coupled inductors
Implementation Method 2
a first capacitor connected to the first inductor and the second inductor at the second node... A snubber circuit according to an embodiment disclosed herein includes a capacitor, a first inductor connected to the capacitor at a first node, a second inductor connected to the capacitor at a second node
Implementation Method 3
a first diode connected to the second inductor and the switch at a third node... a second diode connected to the fourth inductor at a fifth node... a diode including one end connected to the third inductor at a third node and another end connected to the capacitor and the second inductor at a second node
Implementation Method 4
the switch may include a bipolar junction transistor (BJT) and a third diode
Data Source
AI summary
Discussed is converter that may include a first inductor connected to a power source at a first node, a second inductor connected to the first inductor at a second node, a third inductor connected to the first inductor at the first node and the second node, a switch connected in series to the second inductor at a third node, a first diode connected to the second inductor and the switch at the third node, a first capacitor connected to the first inductor and the second inductor at the second node and connected to the first diode at a fourth node, a fourth inductor connected to the first diode and the first capacitor at the fourth node, a second diode connected to the fourth inductor at a fifth node, and a resistor connected to the second diode at a sixth node.