Isolated Converter High Boost Ratio Clamp Circuit
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Solution Overview
Problem
Conventional isolated converters with high boost ratios face inefficiencies and increased costs due to excessive transformer coil turns, leading to higher leakage inductance, stress on components, and reduced efficiency.
Innovation Solution
The proposed isolated converter design reduces the number of transformer coil turns by charging capacitors, allowing it to operate in both the first and third quadrants, thereby increasing efficiency, reducing component costs, and minimizing occupied volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of secondary-side coil turns is increased to achieve high boost ratio, then voltage conversion ratio is improved, but leakage inductance increases causing higher stress on switch and diode
Solution Approach 1:
A clamp circuit is introduced as an intermediary component to share the stress burden. The clamp circuit includes a clamp switch and clamp inductor that activate during high voltage conversion ratio conditions, preventing excessive voltage stress on the main switch and diode while enabling high boost ratios through the transformer turns ratio
Solution Approach 2:
The operating parameters of the switch and diode are dynamically managed by introducing the clamp circuit. When the voltage conversion ratio requires high transformer turns ratio, the clamp circuit activates to alter the voltage stress parameters, allowing the main components to operate within safe parameter ranges even under high boost conditions
2Power
If the number of secondary-side coil turns is increased to achieve high boost ratio, then voltage conversion ratio is improved, but transformer volume increases
Solution Approach 1:
The clamp circuit acts as a mediator that enables high voltage conversion ratios without requiring excessive transformer turns. By introducing this auxiliary circuit, the system achieves high boost ratios through a combination of moderate transformer turns ratio and clamp circuit assistance, thereby reducing transformer volume compared to designs relying solely on high turns ratio
3Power
If the number of secondary-side coil turns is increased to achieve high boost ratio, then voltage conversion ratio is improved, but conversion efficiency decreases
Solution Approach 1:
The clamp circuit serves as an intermediary that improves overall conversion efficiency by enabling the use of lower transformer turns ratios. This reduces leakage inductance and associated energy losses in the transformer, while the clamp circuit efficiently manages the voltage stress during high conversion ratio operation, resulting in better overall efficiency compared to designs using excessive transformer turns
4Power
If multiple boost converters are used to achieve high boost ratio, then voltage conversion ratio is improved, but circuit component cost increases
Solution Approach 1:
The clamp circuit merges multiple functions into a single auxiliary circuit structure. It simultaneously provides voltage stress sharing, enables high voltage conversion ratio, and reduces the need for multiple separate boost converter stages. This integrated approach reduces component count and circuit complexity compared to using multiple cascaded boost converters to achieve the same high boost ratio
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 approach enhances the efficiency of the boost circuit, decreases circuit component costs, and reduces the transformer's volume by minimizing coil turns, addressing the inefficiencies and cost issues of existing high boost ratio converters.
Implementation Method 1
The transformer includes a primary side having a primary side first node and a primary side second node
Implementation Method 2
The boost circuit includes at least one fifth diode, at least one sixth diode, and at least two capacitors
Data Source
AI summary
An isolated converter with high boost ration includes a transformer, a first bridge arm, a second bridge arm, and a boost circuit. The transformer includes a secondary side having a secondary side first node and a secondary side second node. The first bridge arm includes a first diode and a second diode. The second bridge arm includes a third diode and a fourth diode. The boost circuit includes at least one fifth diode coupled between the first bridge arm and the secondary side second node, at least one sixth diode coupled between the second bridge arm and the secondary side first node, and at least two capacitors coupled to the secondary side first node and the secondary side second node.