Direct dc-ac conversion circuit of low voltage push-pull inverter
A technology of DC-AC and conversion circuits, applied in the field of direct DC-AC conversion circuits, can solve the problems of complex design, huge efficiency of the whole machine, etc., and achieve the effect of simple structure, strong versatility and easy implementation
Active Publication Date: 2015-08-19
RUKING EMERSON CLIMATE TECH SHANGHAI CO LTD
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Problems solved by technology
DC-AC converters with higher output voltage generally require a step-up isolated high-frequency transformer, which will have a DC link composed of a rectifier bridge and an electrolytic capacitor, and the output terminal needs a high-frequency chopping inverter, so there is a The design is complicated, the whole machine is huge and the efficiency is low, etc.
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[0011] The direct DC-AC conversion circuit of the low-voltage push-pull inverter of the present invention will be described in detail below with reference to the accompanying drawings.
[0012] see figure 1 , The direct DC-AC conversion circuit of the low-voltage push-pull inverter of the present invention mainly includes: an inverter circuit 1 , a transformer circuit 2 , and a filter circuit 3 .
[0013] The inverter circuit 1 includes two groups, one group is composed of electrolytic capacitor E1, power MOSFET tubes S1, S2, and the other group is composed of electrolytic capacitor E2, power MOSFET tubes S3, S4; the transformer circuit 2 also includes two groups , one group is composed of transformer HFT1 and inductor L1, and one group is composed of transformer HFT2 and inductor L2; the filter circuit 3 also includes two groups, one group is composed of high-speed diodes D1-D4, capacitor C1, electrolytic capacitor E3 and resistor R1 , the other group consists of high-speed ...
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The invention provides a low voltage push-pull inversion direct DC-AC conversion circuit which comprises an inversion circuit, a transformer circuit and a filter circuit. Through enabling power MOSFET in the inversion circuit to work at a quasi-resonance soft-switching state, inputted low voltage direct current is converted into low voltage alternating current pulse voltage, converted into high voltage alternating current pulse voltage through the transformer circuit, and converted into 220V effective value sine half-wave voltage or square wave voltage through the filter circuit. According to quasi-resonance soft-switching and power frequency inversion work principles, a low voltage push-pull inversion direct DC-AC conversion circuit design scheme is designed. The invention has the advantages of simple structure, easy realization, strong versatility, high efficiency and the like.
Description
technical field [0001] The invention relates to a direct DC-AC conversion circuit, in particular to a low-voltage push-pull inverter direct DC-AC conversion circuit. Background technique [0002] In applications powered by batteries and solar cells, due to the low level of input DC voltage, often +12VDC, +24VDC, etc., which do not match the power supply level of commonly used electrical equipment, it is often necessary to use boosted DC-AC The converter converts the input low-voltage DC voltage into an AC sine wave voltage or an AC square wave voltage with an effective value of 220V. DC-AC converters with higher output voltage generally require step-up isolated high-frequency transformers, and there will be a DC link composed of a rectifier bridge and electrolytic capacitors, and the output terminal needs a high-frequency chopping inverter, so there are The design is complex, the whole machine is huge and the efficiency is low. [0003] How to improve the deficiencies of t...
Claims
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IPC IPC(8): H02M7/519
Inventor 管洪飞艾永宝刘占军张玉明朱俊
Owner RUKING EMERSON CLIMATE TECH SHANGHAI CO LTD