Single-switch high-gain direct current boost converter

A DC boost, high-gain technology, used in conversion equipment without intermediate conversion to AC, photovoltaic power generation, etc., can solve the problems of small output voltage gain, reduced converter efficiency, and large voltage stress of power switch tubes.

Inactive Publication Date: 2012-09-19
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

In order to obtain the DC bus voltage required by the grid-connected inverter, the photovoltaic or fuel cell arrays are usually connected in series, and then boosted by a BOOST or two-phase interleaved parallel BOOST circuit. The boost ratio of the two structural converters is equal , the output voltage gain is small. When the input voltage is low, in order to achieve a high output voltage, the switch conduction duty cycle will be close to 1, and the voltage stress of the power switch tube is relatively large, which will reduce the conversion on the one hand. The efficiency of the device, and the switching frequency is not easy to further increase

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Embodiment Construction

[0007] The invention relates to a single-switch high-gain direct-current step-up converter. Such as figure 1 As shown, it includes a DC input power supply (Vin), a power switch tube (T), a boost inductor (L1), a coupled inductor with two windings (L21, L22), five unidirectional rectifier diodes ( D1, D2, D3, D4, D5), three intermediate energy storage capacitors (C1, C2, C3), and one output filter capacitor (C4). The circuit structure is as follows: the positive pole of the DC input power supply (Vin) is connected to one end of the boost inductor (L1), the other end of the boost inductor (L1) is connected to the anode of the unidirectional rectifier diode (D1), and the unidirectional rectifier diode The cathode of (D1) is connected to the end of the same name of a winding (L21) of the coupled inductor, the other end of the winding (L21) of the coupled inductor is connected to the anode of the unidirectional rectifier diode (D3), and the anode of the unidirectional rectifier di...

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Abstract

The invention discloses a single-switch high-gain direct current boost converter, comprising one direct current input power supply source, one power switch tube, one boost inductor, one coupling inductor with two windings, five one-way rectifier diodes, three middle storage capacitors and one output filter capacitor. Compared with the existing direct current boost converter, the single-switch high-gain direct current boost converter has the characteristics of a larger boost transformation ratio under the condition of the same duty ratio, small input current ripple waves, the low voltage stress of the switch tube, a simple structure, convenient control and flexibility and the like, thereby being quite applicable for power generation systems of renewable energy source such as photovoltaic cells or fuel cells, with good application and popularization prospect.

Description

technical field [0001] The invention relates to a DC-DC converter in the field of power electronics, in particular to a single-switch high-gain DC step-up converter. technical background [0002] Due to the influence of environment, temperature and other factors, the output voltage of renewable energy usually fluctuates greatly, and the output voltage level of the monomer is low, while the grid-connected power generation system requires a higher DC bus voltage. In order to obtain the DC bus voltage required by the grid-connected inverter, the photovoltaic or fuel cell arrays are usually connected in series, and then boosted by a BOOST or two-phase interleaved parallel BOOST circuit. The boost ratio of the two structural converters is equal , the output voltage gain is small. When the input voltage is low, in order to achieve a high output voltage, the switch conduction duty cycle will be close to 1, and the voltage stress of the power switch tube is relatively large, which w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07
CPCY02E10/56
Inventor 胡雪峰李艳
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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