Switching Power Supply with Parallel Inverters and H-Bridge Rectification
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Solution Overview
Problem
Existing switching power supply units face challenges in enhancing power conversion efficiency, particularly in DC-DC converters, due to limitations in inverter circuit configurations and rectifying smoothing circuits.
Innovation Solution
A switching power supply unit is designed with two inverter circuits in parallel, each having switching devices, transformers with primary and secondary windings, and a rectifying smoothing circuit with full-bridge rectifying circuits and choke coils, along with a driver for phase-controlled switching to optimize voltage conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional single inverter circuit and single transformer configuration is used, then the device complexity is low, but the power conversion efficiency is insufficient
Solution Approach 1:
The power supply circuit is divided into two parallel inverter circuits, each with its own transformer and full-bridge rectifying circuit. This segmentation allows independent optimization of each channel and enables better utilization of magnetic components, reducing circulating currents and improving overall power conversion efficiency despite increased device complexity.
2Loss of energy
If the secondary windings are coupled to full-bridge rectifying circuits with H-bridge coupling, then the conduction losses are minimized, but the circuit configuration becomes more complex
Solution Approach 1:
The H-bridge coupling configuration merges the transformer secondary windings with the full-bridge rectifying circuits in an integrated manner. This combining allows the rectifying circuit to directly utilize the transformer output without additional coupling components, minimizing conduction losses while maintaining a structured circuit configuration.
3Productivity
If two inverter circuits are provided in parallel with phase-controlled switching, then the power conversion efficiency is enhanced, but the control complexity increases
Solution Approach 1:
The driver performs periodic switching drive operations on the two inverter circuits with controlled phase differences. This periodic switching action enables continuous power conversion with reduced ripple and improved efficiency, while the phase-controlled operation allows optimization of switching losses and magnetic component utilization despite increased control complexity.
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 by minimizing circulating currents and conduction losses, allowing for higher efficiency and reduced heat generation, thus improving overall performance and cost-effectiveness.
Implementation Method 1
two transformers 31 and 32, each having a primary winding 311, 321 and a secondary winding 312, 322
Implementation Method 2
the rectifying smoothing circuit 4 includes eight rectifying devices 411, 412, 421, 422, 431, 432, 441 and 442
Implementation Method 3
a first choke coil 401 and a second choke coil 402
Data Source
AI summary
Provided is a switching power supply unit that includes a pair of input terminals, a pair of output terminals, two transformers, two inverter circuits, a rectifying smoothing circuit, and a driver. The rectifying smoothing circuit includes eight rectifying devices, a first choke coil, a second choke coil, and a capacitance. In the rectifying smoothing circuit, two full-bridge rectifying circuits are provided that each include a first arm and a second arm. The first arm and the second arm each have two of the eight rectifying devices. Secondary windings of the respective two transformers are each coupled to corresponding one of the two full-bridge rectifying circuits to form an H-bridge coupling. Coupling relation of the first arm, the second arm, the first choke coil, the second choke coil, and the capacitance is appropriately defined.