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Flyback photovoltaic grid-connected inverter adopting interleaving parallel-connection active clamping technology

A technology of flyback transformer and inverter, which is applied in the direction of photovoltaic power generation, AC power input conversion to DC power output, single-network parallel feeding arrangement, etc. It can solve the problems of inapplicability, improve efficiency, reduce voltage stress, Effect of Improving Circuit Efficiency

Active Publication Date: 2012-07-11
ALTENERGY POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When the flyback circuit is applied in the DC-DC conversion stage of the integrated photovoltaic grid-connected inverter, the flyback circuit works in the peak current control mode and adopts variable frequency control, and the traditional interleaved parallel active clamping technology is bound to be inapplicable

Method used

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  • Flyback photovoltaic grid-connected inverter adopting interleaving parallel-connection active clamping technology
  • Flyback photovoltaic grid-connected inverter adopting interleaving parallel-connection active clamping technology
  • Flyback photovoltaic grid-connected inverter adopting interleaving parallel-connection active clamping technology

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Embodiment Construction

[0022] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] like figure 1 As shown, it is a schematic diagram of a flyback photovoltaic grid-connected inverter circuit applying the interleaved parallel active clamping technology, which includes an input port 10, a DC-DC conversion stage 20, and a DC-AC conversion stage 30, An output port 40 and a digital control circuit 50, the input port is composed of solar photovoltaic array PV and input filter capacitor C in Composition, the output port 40 is the grid.

[0024] The DC-DC conversion stage 20 includes two flyback circuits 201 and 202 and an active clamping circuit 203 . The first flyback circuit 201 includes a first flyback transformer T r1 , the first main power switch tube S m1 and the first output rectifier diode D s1 , the second flyback circuit 202 includes a second flyback transformer T r2 , the second main power switch tube S m2 and the s...

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Abstract

The invention aims at disclosing a flyback photovoltaic grid-connected inverter adopting an interleaving parallel-connection active clamping technology. Two flyback circuits are in in-out parallel connection with each other, one auxiliary switch tube is respectively added to each flyback circuit, and drains of the two auxiliary switch tubes are connected with each other, are in series connection with a public clamping capacitor to form a clamping circuit and are respectively in parallel connection with two corresponding ends of a transformer primary side winding. An opening signal of one of the flyback circuit auxiliary switch tubes aligns with a closing signal of the other flyback circuit auxiliary switch tube, the alignment method guarantees that the duty ratio of the two flyback circuits is substantially maintained consistent, and the active clamping technology is achieved easily. The communicating time of the auxiliary switch tube of each flyback circuit can be calculated through a digital control circuit according to output voltage values at current moment and accurately controlled, and is suitable for wide-range output voltage occasions. The flyback photovoltaic grid-connected inverter reduces output current ripple, achieves leakage-inductance energy absorption and effective utilization, enhances circuit efficiency and improves electro-magnetic interference (EMI) characteristics of a high-frequency circuit.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a flyback photovoltaic grid-connected inverter device applied in the technical field of solar energy. Background technique [0002] DC-DC power conversion device is one of the most basic forms of power conversion. Due to its simple structure, small number of components, electrical isolation of input and output, and easy realization of multiple outputs, the flyback converter is widely used in DC-DC conversion in the small power range. One of the commonly used topologies of DC-DC stage, the input and output terminals of the two flyback converters are connected in parallel respectively, and the interleaved parallel control can be used to increase the power level, reduce the output current ripple, and reduce the input and output filters. Require. [0003] The loss of the interleaved parallel flyback converter mainly includes the loss of the main power switch on the prim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02J3/38
CPCY02E10/563Y02E10/56
Inventor 陈敏莫琼李朵张哲钱照明罗宇浩凌志敏
Owner ALTENERGY POWER SYST
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