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Cascading bidirectional DC-DC converter

A DC-DC and converter technology, applied in the field of cascaded bidirectional DC-DC converters, can solve problems such as limited applications

Inactive Publication Date: 2007-12-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] This technique uses a single-ended flyback converter as the main topology, and its main drawback is that: the use of coupled inductors
[0009] (flyback transformer) to transmit energy, which limits its application in high-power occasions

Method used

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Embodiment Construction

[0023] Figure 1 is a structural block diagram of a cascaded bidirectional DC-DC converter. It can be seen from Figure 1 that the cascaded bidirectional DC-DC converter is formed by connecting a non-isolated bidirectional DC-DC converter and a high-frequency DC transformer. That is, the non-isolated bidirectional converter is cascaded with the high-frequency DC transformer, or conversely, the high-frequency DC transformer is cascaded with the non-isolated bidirectional converter.

[0024] The non-isolated bidirectional DC-DC converter can be a bidirectional boost converter shown in Figure (c) in Figure 2, a bidirectional buck converter circuit shown in Figure (d) and a bidirectional buck converter circuit shown in Figure (e) Bidirectional conversion topologies such as bidirectional buck-boost converters.

[0025] The composition of the high-frequency DC transformer is shown in Figure 3, that is, the high-frequency inverter / rectifier circuit is connected to the primary side of t...

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PUM

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Abstract

The invention relates to a cascade two-way DC-DC converter, composed of two parts: nonisolated two-way DC-DC converter and high-frequency DC transformer, where the former includes circuittopologies such as two-way boost, two-way buck, two-way boost-buck, etc. and the latter is composed of high-frequency inverter / rectifier, high-frequency transformer, and high-frequency rectifier / inverter unit, where the first and fourth ones include push-pull circuit, half-bridge circuit, full-bridge circuit, push-pull forward circuit, double-tube forward circuit, active clamped forward circuit, nonsymmetrical half-bridge circuit, and other circuits. It implements two-way energy flow and electrical isolation, where all its switch tubes are zero-voltage switches, and has the advantage of relatively independent two parts, convenience for control, high conversion efficiency and power density, and simple circuit structure, etc.

Description

technical field [0001] The cascaded bidirectional DC-DC converter of the invention belongs to a power electronic converter. Background technique [0002] There are three traditional solutions for isolated bidirectional DC-DC converters: [0003] 1. Phase-shifting bidirectional conversion technology [0004] This technology uses transformer leakage inductance (or external inductance) to complete bidirectional energy transmission through bridge arm phase shifting. It uses leakage inductance to transfer energy, limiting the application of this technology in high-power applications. [0005] 2. Voltage type-current type combined bidirectional conversion technology [0006] This technology is the combined voltage mode-current mode topology, and its main drawback is that the voltage spikes on the switching devices caused by the leakage inductance of the transformer are large. This drawback is due to the current mode topology involved in this technology, which limits the applic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/22H02M3/28
CPCY02B70/1491Y02B70/10
Inventor 张方华严仰光王慧贞龚春英
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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