Series-type half-bridge DC-DC (direct current) converter

Abstract

The invention discloses a series-type half-bridge DC-DC (direct current) converter. The series-type half-bridge DC-DC converter comprises a transformer, a primary circuit and a secondary circuit, wherein the primary circuit is connected with a primary winding of the transformer; the secondary circuit is connected with a secondary winding of the transformer; and the primary circuit comprises a direct-current power supply, a primary inductor, two bus capacitors, two blocking capacitor branches and four power switch tubes, which are connected mutually. The series-type half-bridge DC-DC converter has the advantages that the voltage of each power switch device drops to be a half of input voltage, so that a low-voltage power device can be selected, the characteristics of low stress, high efficiency, low cost and high switching frequency of the low-voltage power device are given full play, and the high-efficiency and high-performance DC-DC conversion is realized under the high-input voltage occasions; and simultaneously, voltage balance of the direct-current bus capacitor can be realized without need of adding a circuit or a control mode.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a serial half-bridge DC-DC (direct current-direct current) converter. Background technique [0002] In recent years, various power supply devices have been widely used in communication, lighting, military and other industries. In order to regulate the power quality of power supply equipment, some worldwide academic organizations and countries have begun to formulate and implement a series of standards for power supply equipment. It is one of the important standards to limit the harmonic pollution of power supply equipment to the AC grid, such as IEC555-2, IEEE519 and so on. In order to meet harmonic standards, multi-level cascaded high-frequency converters are generally used in the industry, and power factor correction technology (Power Factor Correction, PFC) is used in the first-level rectification equipment. [0003] When multi-stage cascaded high-frequ...

AI Technical Summary

Problems solved by technology

However, in the three-level structure composed of low-voltage power devices, the number of switching devices is large, and at the same time, the two bus capacitors in the three-level structure are connected in series to the DC bus voltage, and additional hardware circuits or control devices need to be added during use. Method to achieve voltage equalization of DC bus capacitors

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