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Isolated semi-quasi Z-source DC boost converter

A DC boost and isolation technology, which is applied in the direction of converting DC power input to DC power output, instruments, adjusting electrical variables, etc., can solve the problem that the output voltage gain needs to be improved, and achieves simple structure, wide application prospects, and convenient control. Effect

Pending Publication Date: 2021-10-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an isolated semi-quasi-Z source DC boost converter to realize the purpose of the invention of isolated high-gain output of the converter, and solve the problem of the existing isolated wide-gain DC- The technical problem that the output voltage gain of DC converter needs to be improved

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Embodiment Construction

[0015] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] refer to figure 1 , the isolated semi-quasi-Z source DC boost converter disclosed in the present invention comprises: a first inductor L 1 , the fourth diode D 4 , the fourth capacitor C 4 , the fifth diode D 5 Composed of the first boost circuit, the second inductor L 2 , the first capacitance C 1 , the first diode D 1 And the second step-up circuit composed of three-switch inverter, the transformer T r , the second capacitor C 2 , the third capacitor C 3 , the second diode D 2 , the third diode D 3 and load R o The output circuit composed of; among them, the three-switch inverter is composed of the first switching tube S 1 , the second switch tube S 2 , the third switch tube S 3 composition.

[0017] figure 2 The connection relationship of each device in the equivalent circuit of the isolated semi-quasi-Z source DC ...

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Abstract

The invention discloses an isolated semi-quasi Z-source DC boost converter, and belongs to the technical field of power generation, power transformation or power distribution. The circuit comprises a first-stage booster circuit composed of a first inductor, a fourth diode, a fourth capacitor and a fifth diode, a second-stage booster circuit composed of a second inductor, a first capacitor, a first diode and a three-switch inverter, and an output circuit composed of a transformer, a second capacitor, a third capacitor, a second diode, a third diode and a load. The whole circuit is simple in structure, the power supply input current is continuous, the buck-boost characteristic of a semi-quasi Z-source network is combined, the circuit has higher output voltage gain, load current is continuous, and the circuit has straight-through and open-circuit immunity, can work in a straight-through state, and does not have starting impact current and impact current at the switching-on moment of a switching tube.

Description

technical field [0001] The invention relates to power electronic circuit technology, in particular to an isolated semi-quasi-Z source DC step-up converter, which belongs to the technical field of power generation, power transformation or power distribution. Background technique [0002] In today's booming power electronic conversion technology, in order to convert low voltage into a constant DC bus voltage, many step-up DC-DC converters have been proposed and studied. As a DC-DC conversion topology that can achieve both a large boost ratio and electrical isolation, the isolated boost DC-DC converter has great potential in the fields of renewable energy power generation, distributed power generation, energy storage systems, and communications and aerospace. Broad application prospects. The current-fed full bridge (CFFB, Current-Fed Full Bridge) DC-DC converter not only has a boost function, but also is suitable for applications with high-order voltage gain, so it is widely u...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33569
Inventor 朱小全刘康吴毅伟金科
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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