Three-Phase Resonant DC-DC Converter With Diode Short-Circuit Clamping
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Solution Overview
Problem
Existing three-phase LLC resonant DC-DC converters require software-based short circuit protection, which can be complex and prone to errors.
Innovation Solution
The proposed three-phase LLC resonant DC-DC converter incorporates clamping diodes between the secondary windings and the input terminals, eliminating the need for software-based short circuit protection by providing hardware-based protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If software-based short circuit protection is used, then the converter can respond to short circuits, but the system becomes complex and prone to errors
Solution Approach 1:
The patent replaces software-based protection with hardware-based protection using clamping diodes. The diodes provide automatic short circuit protection through their inherent electrical characteristics without requiring software intervention, thereby reducing control software complexity while maintaining or improving reliability.
Solution Approach 2:
The clamping diodes provide self-service protection by automatically clamping voltages and limiting currents during short circuit conditions. This hardware mechanism operates autonomously without requiring external control or software processing, simplifying the overall system while ensuring reliable protection.
2Reliability
If clamping diodes are added for hardware-based protection, then reliability improves, but device complexity increases
Solution Approach 1:
The clamping diodes are simple, inexpensive semiconductor components that provide robust protection. While they add physical components to the circuit, their low cost and simplicity offset the increase in device complexity, making the overall system more reliable without significant penalty.
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 solution effectively prevents damage from short circuits by clamping voltages and currents, allowing the control software to respond appropriately without risking component damage, thus enhancing reliability and reducing complexity.
Implementation Method 1
The converter comprises three clamping diodes between each of the second primary terminals of the primary windings and the first positive terminal; the converter comprises three further clamping diodes between the first negative terminal and each of the second primary terminals of the primary windings
Implementation Method 2
a transformer device comprising three primary windings and three secondary windings
Implementation Method 3
a resonant tank device comprising a primary side resonant tank device connected between the first SC node, the second SC node and the third SC node of the switching circuit and the primary terminals of the three primary windings of the transformer device
Data Source
AI summary
A three phase resonant DC-DC converter for converting a first DC voltage between two first terminals to a second DC voltage between two second terminals comprises a transformer device with three primary windings and three secondary windings, a switching circuit, a rectifying circuit, a resonant tank device, a secondary capacitor, and a control circuit. The resonant tank device has a primary side resonant tank device with three resonant inductors and three resonant capacitors connected to the primary windings. The converter further includes three clamping diodes between each of the second primary terminals of the primary windings and the first positive terminal, and three further clamping diodes between the first negative terminal and each of the second primary terminals of the primary windings.