Novel AC-AC power conversion topology principle structure and control method thereof

Abstract

The invention discloses a novel high-efficiency AC-AC power conversion topology principle structure and a control method thereof. The novel AC-AC power conversion topology principle structure consists of parallel output of two semiconductor power switches which are complementary in phase, and each semiconductor power switch can be modulated in a two-way semi-wave mode, and stable direct-current, alternating-current or pulse coding power current or voltage is output through electric filtering, closed loop control algorithm with corresponding characteristics and driving. The AC-AC power conversion topology structure reduces quantity of series-connected power consumption apparatuses, greatly improves power conversion efficiency and reduces power consumption, so that radiating requirements are lowered, the volume of the equipment is reduced, and thus, the novel high-efficiency AC-AC power conversion topology principle structure is especially suitable for a low-voltage large-current application occasion with limited space and radiation conditions. AC-AC direct power conversion further increases the utilization rate of the transformer, and the interferences to the power grid are greatly lowered. The topology structure disclosed by the invention is simple, good in controllability, high in efficiency and capable of providing powerful technical support to low-voltage large-current application.

Description

technical field [0001] The invention designs a novel, simple and efficient AC-AC power conversion topology principle structure, and provides a control method. Through the control algorithm and high-speed logic drive control, any pulse-coded high-current output from DC to AC, and zero-return or non-return-to-zero can be realized. Its high efficiency is the main technical feature of this topology. The invention is mainly used in application fields such as low-voltage high-current power supply, controllable source electromagnetic transmitter, aviation electromagnetic exploration and high-power electric welding machine, and is especially suitable for application occasions with low resistance and heavy load. Background technique [0002] Since the emergence of power electronics technology, various power conversion topology structures and corresponding control algorithms have been widely used to obtain the required excellent characteristics of power supply technology. High effici...

AI Technical Summary

Problems solved by technology

However, due to traditional power conversion topologies such as Figure 10 ) mainly adopts the principle structure of AC / DC+DC / AC, that is, the rectification conversion from AC to DC is performed first, and then the inverse conversion output from DC to AC is performed. It needs two conversions to obtain the required power supply characteristics. The power conversion topology is complex and the number of power devices in series is large, so the loss is still relatively large

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