Bi-directional isolation DC/DC converter based on three-winding transformer
A two-way isolation, three-winding technology, applied in the direction of output power conversion device, DC power input conversion to DC power output, instruments, etc., can solve the problem of uncontrollable reactive current, redundant, and reduce the efficiency of the whole converter. Achieve the effect of improving system efficiency and power density, small conduction loss, and reducing switching loss
Inactive Publication Date: 2014-07-16
YANSHAN UNIV
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However, this reactive current is uncontrollable, especially when the converter is working under a heavy load, this reactive current is redundant, which reduces the overall efficiency of the converter
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[0022] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments:
[0023] Such as figure 1 As shown in the electrical schematic diagram of the present invention, the converter of the present invention includes an active full-bridge unit, two parallel symmetrical half-bridge units and a three-winding high-frequency transformer series phase-shifting inductor network unit.
[0024] The active full bridge unit includes a first power switch S 1 , The second power switch S 2 , The third power switch tube S 3 , The fourth power switch tube S 4 And the first capacitor C 1 ; Among them, the first power switch S 1 And the third power switch S 3 The drain is connected to the previous voltage source V p The positive connection; the second power switch S 2 And the fourth power switch S 4 And the source of the previous stage voltage source V p The negative pole connection; the first power switch S 1 The source and the second power sw...
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A bi-directional isolation DC / DC converter based on a three-winding transformer is composed of an active full-bridge unit, two symmetrical half-bridge units connected in parallel and a three-winding high-frequency transformer series-connection phase-shifting inductor network unit, wherein the active full-bridge unit and the half-bridge units achieve rectification or inversion, a high-frequency transformer achieves isolation and transformation, and a phase-shifting inductor network achieves transmission of energy and meanwhile changes the soft switching characteristic of the converter. Phase shifting is carried out between the full bridge at the front stage and the two symmetrical half bridges connected in parallel at the back stage, and bi-directional flowing of energy can be controlled. Through phase shifting between bridge arms of the full bridge at the front stage and phase shifting between two bridge arms at the back stage, the soft switching characteristic of the converter can be obviously improved, and all power switching tubes can achieve full-course soft switching under a wide input voltage range. The two symmetrical half bridges at the back stage are connected in parallel, so that the current RMS value of the back stage can be lowered. The bi-directional isolation DC / DC converter based on the three-winding transformer has the advantages of low conduction loss, high conversion efficiency, bi-directional flowing of energy, electric isolation and full-course soft switching under the wide input voltage range.
Description
Technical field [0001] The invention relates to the field of power electronic converters, in particular to a bidirectional isolated DC / DC converter. Background technique [0002] With the rapid development of new energy power generation, micro-grid and electric / hybrid vehicles, bidirectional DC / DC converters are more and more widely used. The two-way DC / DC converter can be used as a bridge between two electrical systems of different voltage levels, and at the same time can realize the energy management of the two-way flow between the two. [0003] In modern power conversion technology, the high efficiency and high power density characteristics of power electronic converters are becoming more and more important. In order to increase the volume of the converter, a simple and direct method is to reduce the volume of passive components by increasing the working frequency of the converter. However, as the operating frequency increases, the switching loss of the converter will become l...
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IPC IPC(8): H02M3/335
CPCY02B70/10
Inventor 孙孝峰申彦峰李昕
Owner YANSHAN UNIV