DC to DC Converter with Symmetrical Power Flow
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Solution Overview
Problem
Intermediate bus converters face inefficiencies due to high power loss in switching, conduction, and transformer losses, particularly in resonant and non-regulated converters, which affect overall power conversion efficiency and power density, especially when dealing with varying input voltages and current ripples.
Innovation Solution
A DC to DC converter configuration featuring a transformer with symmetrical power flow during positive and negative switching cycles, a secondary bridge synchronous rectifying circuit, and a control circuit that balances magnetic flux and minimizes leakage inductance, using lower voltage rating MOSFETs to reduce power loss and optimize transformer structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If non-regulated converter with fixed duty cycle close to 50% is used, then switching loss is reduced, but transformer utilization becomes inefficient
Solution Approach 1:
The patent implements dynamic duty cycle control for the synchronous rectifier that varies with the primary switch duty cycle, enabling the transformer to operate at optimal utilization levels across different operating conditions rather than being fixed at 50% duty cycle
Solution Approach 2:
The patent changes the operating parameters of the synchronous rectifier by adjusting its duty cycle dynamically, transforming it from a fixed 50% duty cycle operation to a variable duty cycle operation that optimizes transformer utilization efficiency
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 enhances power conversion efficiency and reduces transformer winding losses, improving both regulated and non-regulated operation modes by minimizing conduction and switching losses, and optimizing transformer utilization.
Implementation Method 1
a transformer, a primary power circuit, a secondary bridge synchronous rectifying circuit, an output inductor and a control circuit; wherein the transformer has a transformer core, a primary winding and a secondary winding
Implementation Method 2
the secondary bridge synchronous rectifying circuit is electrically coupled to the secondary winding of the transformer, and includes: a first switch having a first end electrically coupled to one end of the output inductor
Data Source
AI summary
The present disclosure discloses a DC/DC converter and a DC/DC conversion system. The DC/DC converter includes a transformer, a primary power circuit, a secondary bridge synchronous rectifying circuit, an output inductor and a control circuit. The primary power circuit receives an input voltage, and deliver a symmetrical power flow to a secondary side of the transformer during positive and negative switching cycles, and a magnetic flux in the transformer core is balanced through the above symmetrical power flow. The rectifying circuit is coupled to a secondary winding of the transformer. The control circuit provides primary and secondary driving signals to the primary power circuit and the rectifying circuit, respectively. When an output voltage of the primary power circuit is zero, the control circuit controls the first, the second, the third and the fourth switches to be conductive.