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High Efficiency High Gain DC-DC Converter with Coupled Inductor

A technology of DC-DC and coupled inductance, which is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and output power conversion devices, which can solve the problem of increasing the voltage stress and energy loss of the switch tube and the large voltage stress of the switch tube. , reduce converter efficiency and other issues, to achieve the effect of solving the reverse recovery problem, low voltage stress, and reducing stress

Active Publication Date: 2016-04-13
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, high-gain non-isolated DC-DC converters mainly include switched capacitor type and switched inductor type. The voltage can be increased by adding switched capacitors or inductors, but it is difficult to achieve soft switching, which reduces the efficiency of the converter.
The secondary boost converter can achieve high gain and is also very popular, but the voltage stress of the switch tube is very large, which limits the further increase of the voltage
In addition, a high gain can also be achieved through a coupled inductor, but if the leakage inductance of the coupled inductor is not controlled, it will increase the voltage stress and energy loss of the switch tube

Method used

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  • High Efficiency High Gain DC-DC Converter with Coupled Inductor

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Embodiment Construction

[0013] In order to further illustrate the content and features of the present invention, the specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. But the implementation of the present invention is not limited thereto.

[0014] refer to figure 1 , the high-efficiency high-gain DC-DC converter with coupled inductors of the present invention, with DC power V in , switch tube Q, first diode D 1 , the second diode D 2 , the fourth diode D M1 , the fifth diode D M2 , the first inductance L 1 , the second inductance L r , the first capacitance C 1 , the third capacitor C M1 and the fourth capacitor C M2 The input stage Boost converter of the double voltage output constituted; with the first capacitor C 1 , switch tube Q, third diode D o , the sixth diode D c , the seventh diode D r , the second capacitance C 2 , the fifth capacitor C c , the sixth capacitance C o , coupled inductance (n 1 :n 2...

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Abstract

The invention provides a high-efficiency high-gain DC-DC (Direct Current to Direct Current) converter with a coupling inductor. A voltage-doubled output input-stage Boost converter is formed by a direct-current power supply, a switching tube, a first diode, a second diode, a fourth diode, a fifth diode, a first inductor, a second inductor, a first capacitor, a third capacitor and a fourth capacitor; an output-stage Boost converter with coupling inductor is formed by the first capacitor, the switching tube, a third diode, a second capacitor, a fifth capacitor, a sixth capacitor, the coupling inductors and a load. The input-stage Boost converter introduces the second inductor as a resonant inductor and the output-stage Boost converter adopts the coupling inductor, so that the zero current turning-on of the switching tube is realized and the zero current turning-off of each diode is realized at the same time. The converter has the advantages that the gain is extremely high and can reach 2(2+N) / (1-D)2, and the voltage stress of the switching tube is very low and is only 1 / (2+N).

Description

technical field [0001] The invention relates to the field of high-gain non-isolated DC-DC converters, in particular to a high-efficiency and high-gain DC-DC converter with coupled inductors. Background technique [0002] In recent years, high-gain non-isolated DC-DC converters are widely used in UPS, distributed photovoltaic power generation and battery energy storage systems. At present, high-gain non-isolated DC-DC converters mainly include switched capacitor type and switched inductor type. The voltage increase is achieved by adding switched capacitors or inductors, but it is difficult to achieve soft switching, which reduces the efficiency of the converter. The secondary boost converter can achieve high gain and is also very popular, but the voltage stress of the switch tube is very large, which limits the further increase of the voltage. In addition, a high gain can also be achieved through a coupled inductor, but if the leakage inductance of the coupled inductor is no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155H02M3/07
Inventor 张波付坚丘东元肖文勋黄子田
Owner SOUTH CHINA UNIV OF TECH
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