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Direct current-direct current conversion circuit

A technology of DC conversion circuit and buffer circuit, which is applied in the direction of AC network circuit, DC power input conversion to DC power output, circuit device, etc., can solve the problem of large capacitance of photovoltaic modules, achieve reverse recovery process suppression, and avoid common mode Generation of electric current, effect of cost reduction

Active Publication Date: 2020-01-03
HUAWEI DIGITAL POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, due to the large capacitance of the photovoltaic module to the ground, in order not to generate common mode current, the DC-DC conversion circuit can only work at two levels

Method used

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  • Direct current-direct current conversion circuit
  • Direct current-direct current conversion circuit
  • Direct current-direct current conversion circuit

Examples

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Embodiment Construction

[0138] The embodiment of the present application provides a DC-DC conversion circuit capable of working at three levels without generating a common mode current.

[0139] It should be understood that the DC-DC conversion circuit of the embodiment of the present application can be applied to any DC conversion scenario, specifically, it can be applied to a photovoltaic power generation system, please refer to figure 1 , a schematic diagram of the structure of the photovoltaic power generation system in the embodiment of the present application. Such as figure 1 As shown, the photovoltaic power generation system includes a photovoltaic module, a DC-DC conversion circuit, a battery pack, an inverter circuit, a DC load, an AC load, and a power grid.

[0140] In this photovoltaic power generation system, solar energy is converted into DC power by photovoltaic modules, and the DC power is boosted by a DC-DC converter. The inverter converts the AC power into AC power, which can be d...

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PUM

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Abstract

The embodiment of the invention discloses a direct current-direct current conversion circuit which can work at three levels on the premise of not generating common-mode current. The DC-DC conversion circuit comprises an input inductor, a first capacitor, a second capacitor, a flying capacitor, a first switch, a second switch, a first inductor, a first diode, a first buffer circuit, a third switch,a fourth switch, a second inductor, a second diode and a second buffer circuit, wherein the power supply, the input inductor, the first diode, the second diode, the first capacitor and the second capacitor are sequentially connected in series, a first end of the flying capacitor is connected between the first diode and the second diode, a second end of the flying capacitor is connected between the first switch and the third switch, and a second end of the flying capacitor is further connected between the second switch and the second inductor.

Description

technical field [0001] The present application relates to the technical field of photovoltaic power generation, and in particular to a DC-DC conversion circuit. Background technique [0002] Facing the current increasingly serious energy shortage and environmental pollution problems, the development and utilization of renewable energy and various green energy has become an important measure for the sustainable development of human equipment. As a new type of energy, solar energy has become an important object of human development and utilization. [0003] At present, using solar energy to generate electricity is an important means to develop and utilize solar energy. An existing photovoltaic power generation system includes a photovoltaic module and a DC converter, wherein the photovoltaic module is used to convert solar energy into DC power, and the DC converter is used to convert the DC power to DC. [0004] The study found that the multi-level power conversion circuit h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/34
CPCH02M3/3353H02M1/34H02M1/0058H02M1/344H02M1/0095H02M3/155H02M3/07H02M3/158
Inventor 王均徐厚建林天散张芳坡
Owner HUAWEI DIGITAL POWER TECH CO LTD
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