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Photovoltaic inverter main circuit

A technology of photovoltaic inverter and inverter circuit, which is applied in the field of power electronics, can solve problems such as uneven current of relays, and achieve the effect of steady-state current equalization

Pending Publication Date: 2020-06-23
深圳市禾望科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the purpose of this application is to provide a main circuit of a photovoltaic inverter to solve the problem of uneven current in the relays used in parallel in the photovoltaic inverter

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  • Photovoltaic inverter main circuit
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  • Photovoltaic inverter main circuit

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Embodiment Construction

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer and clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0022] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right" etc. are based on The orientation or positional relationship shown in the drawings is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orienta...

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Abstract

The invention discloses a photovoltaic inverter main circuit. The photovoltaic inverter main circuit comprises a photovoltaic array, a boosted circuit, a direct-current bus capacitor, an inverter circuit and a grid-connected circuit which are connected in sequence; the grid-connected circuit comprises a first grid-connected branch and a second grid-connected branch; one end of the first grid-connected branch is connected with the anode output end of the inverter circuit, and the other end is connected with the anode of the power grid; one end of the second grid-connected branch is connected with the cathode output end of the inverter circuit, and the other end is connected with the cathode of the power grid; each of the first grid-connected branch and the second grid-connected branch comprises a first switching circuit and a second switching circuit which are connected in parallel; and each of the first switching circuit and the second switching circuit comprises a relay and a first power switching tube which are connected in series. According to the application, the power switch tube is connected in series in the relay loop, so that zero-current connection and disconnection of therelay can be realized, and in addition, the steady-state current sharing of the relay can be realized by utilizing the positive temperature characteristic of the conduction voltage drop of the powerswitch tube.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to a main circuit of a photovoltaic inverter. Background technique [0002] In the main circuit of photovoltaic inverters, most relays are used as grid-connected disconnectors. If a relay with a large frame is used, the cost of the photovoltaic inverter will be too high; and if two or more relays with a small frame are used instead of a relay with a large frame (relays with a small frame are used in parallel), the cost is high. There will be a decrease, but there are relays used in parallel with uneven current, and the current of a single relay exceeds the rated current when it is turned on and off, which makes the contacts of the relay stick and cause the relay to fail, resulting in the failure of the photovoltaic inverter. Contents of the invention [0003] In view of this, the purpose of the present application is to provide a main circuit of a photovoltaic...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M7/5387H02M3/156
CPCH02M7/5387H02M3/156Y02E10/56
Inventor 谭鹏飞曾建友熊新
Owner 深圳市禾望科技有限公司
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