Noninsulated type converting circuit from direct-current voltage to alternating-current voltage
A technology of DC voltage and AC voltage, applied in the field of voltage conversion, can solve the problems of low conversion efficiency of the circuit and large loss of the switch tube, and achieve the effects of reducing loss, improving conversion efficiency, and reducing common mode components
Active Publication Date: 2011-09-14
SOLAR POWER NETWORK TECHNOLOGY (ZHEJIANG) CO LTD
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Problems solved by technology
but figure 1 The output current of the circuit shown in the power transmission stage needs to flow through three switch tubes. Due to the large loss of the switch tubes, the conversion efficiency of the circuit is not high.
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[0040] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0041] see figure 2 , which is a schematic diagram of a non-isolated DC voltage to AC voltage conversion circuit provided by the present invention.
[0042] The non-isolated DC voltage to AC voltage conversion circuit provided by the embodiment of the present invention includes: a first capacitor C1, a second capacitor C2, a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, and a fourth switch Tube Q4, fifth switching tube Q5, sixth switching tube Q6, seventh switching tube Q7, first diode D1, second diode D2 and inductor;
[0043] The first capacitor C1 and the second capacitor C2 are connected in series to the positive output terminal and the negative output terminal of the DC power supply SG;
[0044] The fir...
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The invention provides a noninsulated type converting circuit from direct-current voltage to alternating-current voltage. A clamping circuit is connected among a first node, a second node and a third node; the clamping circuit comprises three switch pipes which are respectively a fifth switch pipe, a sixth switch pipe and a seventh switch pipe and two diodes which are respectively a first diode and a second diode; and the clamping circuit realizes the aim that the potential of a follow current loop is positioned half of direct current power supply voltage in the follow current phase of the converting circuit so as to reduce the common-mode component in output current and output leakage current. The invention ensures that the output current only flows through two switch pipes in the power transmission phase rather than flowing through three switch pipes like the prior art; accordingly, the circuit provided by the invention can reduce loss generated when flowing through the switch pipe,thereby improving the converting efficiency of the circuit.
Description
technical field [0001] The invention relates to the technical field of voltage conversion, in particular to a non-isolated DC voltage to AC voltage conversion circuit. Background technique [0002] The non-isolated photovoltaic grid-connected inverter is essentially a conversion circuit from DC voltage to AC voltage. [0003] Since the non-isolated photovoltaic grid-connected inverter has no transformer, it has the advantages of high efficiency, small size, light weight and low cost. However, due to the parasitic capacitance of the solar panel to the ground in photovoltaic power generation, the high-frequency time-varying voltage generated by the switching action of the switching device in the grid-connected inverter acts on the parasitic capacitance, thereby increasing the common-mode component of the output current , the resulting leakage current may exceed the allowable range. The high-frequency leakage current will bring conduction and radiation interference, which wil...
Claims
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IPC IPC(8): H02M7/48H02M7/5387
CPCH02M2001/007H02M7/5387H02M2001/123H02M1/007H02M1/123
Inventor 欧余斯郭华为宋元斌
Owner SOLAR POWER NETWORK TECHNOLOGY (ZHEJIANG) CO LTD