AC/DC switching circuit based on hybrid parallel power devices

Abstract

The invention discloses an AC / DC switching circuit based on hybrid parallel power devices. The AC / DC switching circuit based on the hybrid parallel power devices comprises multiple electric current switching sub-circuits. The electric current switching sub-circuits comprise multiple interleaved switching modules; the switching modules comprise multiple direct-parallel power devices; output ends of a power source are in electric connection with the multiple electric current switching sub-circuits in a one-to-one mode and a switching voltage is outputted. According to the AC / DC switching circuit based on the hybrid parallel power devices, the electric current output capability is improved through a direct-parallel method of the power devices, the electric current output capability is further improved through an interleaved-parallel method, meanwhile, output harmonic waves are reduced, and electric current output capability of devices is greatly improved on the premise of not increasing the through-flow capability of an individual device. At the same time, a flexible design on high electric current output can be achieved, components of multiple electric current specifications can be selected, and the difficulty in heat dissipating design of the power devices can be greatly lowered.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an AC / DC conversion circuit based on hybrid parallel connection of power devices. Background technique [0002] Fully controlled devices are more and more widely used in power electronic conversion technology. A power electronic device that can be controlled both on and off by a control signal is called a fully-controlled device. DC / AC conversion technology provides efficient and flexible AC power, which is widely used in energy and power fields, such as solar power generation, wind power generation, electric vehicles, UPS, active power filter (APF) and other applications. The high-power DC / AC conversion technology characterized by high-current output is one of the research hotspots in this technical field. [0003] At present, although the current flow capacity of a single device is slowly improving with the manufacturing level of the device, it is far from meeting t...

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Problems solved by technology

[0003] At present, although the current flow capacity of a single device is slowly increasing with the manufacturing level of the device, it is far from meeting the needs of the application. The direct parallel application of power electronic devices is an important solution to realize the high current application of power electronic devices.

The direct parallel connection of power devices can improve the current output capability of the device. Although the number of devices directly connected in parallel can be large in theory, the number of direct parallel connections with reasonable technical difficulty is 3-6, that is, from the perspective of feasibility, direct parallel connection is not considered. Capacitance factor, direct parallel technology can only increase the current output capacity of equipment by 3-6 times, and cannot meet the needs of high-power power facilities with large output currents, and the structure is complex, difficult to implement, and high in cost

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