Coupled inductor zvs/zcs dual-transistor DC converter with charge pump

Abstract

The invention relates to a coupling inductance ZVS / ZCS double tube direct current converter with a charge pump. The coupling inductance ZVS / ZCS double tube direct current converter with the charge pump comprises a direct-current power source, a first boosting circuit, a second boosting circuit, a first charge pump boosting unit, a second charge pump boosting unit, a switch circuit and a load, wherein an output voltage of the direct-current power source is output through two paths, one path of the output voltage is input into the first charge pump boosting unit after undergoing primary boosting of the first boosting circuit and input to one end of the load through the switch circuit after undergoing secondary boosting of the first charge pump boosting unit, and the other path of the output voltage is input to the second charge pump boosting unit after undergoing primary boosting of the second boosting circuit and input to the other end of the load after undergoing secondary boosting of the second charge pump boosting unit. The circuits are small in size and high in conversion efficiency, voltage stress of power switch tubes is low, current stress of the power switch tubes is small, and conduction loss of the power switch tubes is small; zero voltage switching can be achieved, and switching loss is small; all power diodes can be switched off naturally with zero current, the reverse recovery problem does not exist, and EMI of the circuits is small.

Description

technical field [0001] The invention relates to a coupled inductance ZVS / ZCS double-tube DC converter with a charge pump, belonging to the field of power electronic converters. Background technique [0002] Under the dual pressure of energy shortage and environmental problems, new energy power generation has received extensive attention and research because of its cleanliness. In order to integrate a single photovoltaic cell and fuel cell into the grid, it is necessary to use a high-gain, high-efficiency DC converter to greatly improve the DC power generation. Voltage level. The boosting capability of the traditional Boost converter is very limited. As the gain increases, the duty cycle gradually increases, the inductor current ripple increases, and the required inductance also increases; and when applied to high output voltage applications, the power The voltage stress and current stress of the switch tube are large, and the conduction loss of the switch tube is large; the...

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Problems solved by technology

The boosting capability of the traditional Boost converter is very limited. As the gain increases, the duty cycle gradually increases, the inductor current ripple increases, and the required inductance also increases; and when applied to high output voltage applications, the power The voltage stress and current stress of the switch tube are large, and the conduction loss of the switch tube is large; the voltage stress of the diode on the output side is large, and the diode is hard to turn off, the reverse recovery problem and EMI problem are very serious, and the conversion efficiency is low

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