DC-AC conversion circuit
A technology of AC conversion and circuit, which is applied in the direction of converting irreversible DC power input into AC power output, and can solve the problems that the efficiency cannot be achieved at the same time
Active Publication Date: 2011-11-23
DELTA ELECTRONICS INC
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Problems solved by technology
[0008] The main purpose of the present invention is to provide a DC-AC conversion circuit to solve the problem that the existing DC-AC conversion circuit cannot achieve high efficiency and reduce leakage current when it is applied to a solar grid-connected system
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[0040] Some typical embodiments embodying the features and advantages of the present invention will be described in detail in the description in the following paragraphs. It should be understood that the present invention can have various changes in different ways without departing from the scope of the present invention, and the descriptions and drawings therein are used for illustration in nature rather than for limiting the present invention .
[0041] see Figure 4 , which is a schematic circuit structure diagram of a DC-AC conversion circuit in a preferred embodiment of the present invention. Such as Figure 4 As shown, the DC-AC conversion circuit 4 can be, but is not limited to, applied to solar grid-connected systems, and is a non-isolated circuit structure, which receives a DC device 8, such as a solar panel, and generates a DC input voltage V DC , and converted to an AC output voltage Vo to provide to an AC load 9, such as AC electrical equipment or a mains networ...
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The invention discloses a DC-AC conversion circuit, which comprises a switching circuit. The switching circuit receives DC electric energy and converts the DC electric energy to output AC modulated voltage between a first output end and a second output end, and comprises a first switch branch circuit, a second switch branch circuit and a sixth switching element, wherein the first switch branch circuit consists of a first switching element and a second switching element which are electrically connected in series in turn; the first output end is electrically connected between the first and second switching elements; the second switch branch circuit consists of a third switching element, a fourth switching element and a fifth switching element which are electrically connected in series in turn; the second output end is electrically connected between the fourth and fifth switching elements; one end of the sixth switching element is electrically connected between the third and fourth switching elements, and the other end of the sixth switching element is electrically connected between the first and second switching elements; and the first to sixth switching elements performs switching-on / off, so that the DC-AC conversion circuit improves efficiency and reduce the generation of leakage current.
Description
technical field [0001] The present invention relates to a conversion circuit, and in particular to a DC-AC conversion circuit. Background technique [0002] At present, the main energy used by human beings is petroleum, which generates the required power or electricity by burning petroleum, such as automobiles or fuel-fired generators (factories). However, the high temperature and exhaust gas generated during the combustion of petroleum will not only cause air quality deterioration It will also worsen the global warming effect. In addition, according to the world's oil production statistics, oil production will reach its peak within ten years, and then production will decrease year by year. This not only means that oil prices (including electricity prices) will no longer be cheap, but may also lead to a real oil crisis, indirectly triggering global economic storm. [0003] In view of this, the effective and economical conversion of renewable energy into common people's liv...
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IPC IPC(8): H02M7/46
Inventor 顾振维李雷鸣黄河
Owner DELTA ELECTRONICS INC