DC/DC converter suitable for high-voltage input high-power output

Abstract

The invention relates to a DC / DC converter suitable for high-voltage input high-power output, which comprises an input voltage-division circuit formed by serially connecting two input voltage division capacitors, a first resonant converter, a second resonant converter and an output filter capacitor shared by the two resonant converters, wherein the first resonant converter and the second resonant converter adopt an LLC serial resonant circuit; two ends of the first voltage division capacitor are connected with the input end of the first resonant converter, the output end of the first resonant converter is connected with the output filter capacitor; and two ends of the second input voltage division capacitor are connected with the input end of the second resonant converter, and the output end of the second resonant converter is connected with the output filter capacitor. The invention can effectively lower the voltage class of a switching tube and the cost, reduce the switching loss, and can effectively realize static and dynamic flow equalizing property between the two resonant converters, thereby improving the reliability.

Description

technical field [0001] The invention belongs to a DC / DC converter. Background technique [0002] With the development of power electronics technology, the requirements for power conversion devices are getting higher and higher, especially the requirements for input power factor are getting higher and higher. After three-phase power factor correction, the output of the circuit can generally reach 760~800V, which requires the voltage level of the switching tube of the subsequent DC / DC converter to be increased, making the selection of the power switching tube difficult and increasing the manufacturing cost. cost. Moreover, in order to reduce the volume and weight of the converter, the switching frequency must be increased, which requires the soft switching of the switching tube (that is, zero voltage or zero current) to reduce switching losses. Contents of the invention [0003] In order to overcome the shortcomings of the existing DC / DC converters, such as difficult selec...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of the existing DC / DC converters, such as difficult selection of power tubes, high cost, and large switching losses, the present invention provides a high-voltage power tube suitable for reducing the voltage level of the switching tube, reducing costs, and reducing switching losses. DC / DC Converter with Input and High Power Output

Images