Output adjustable changeable structural direct current switch power supply

Abstract

An output adjustable changeable structural direct current switch power supply comprises a full-bridge dc converter, a high frequency transformer, two single-phase diode rectifier bridges, a low frequency switch power switching tube, and two bypass diodes. The low frequency switch power switching tube and the bypass diodes are respectively connected between positive and negative output ends of the single-phase diode rectifier bridges and switch power supply to change output way agilely by control of low frequency switch power switching tube, which may be parallel operation and wound operation, being a structural changeable dc switch power supply. The invention is especially applicable for the switch power supply application field with output in wide scale adjustment. Compared with wide scale adjustment technology in prior art, adjusting scale of output voltage and current is greater and voltage and current stress of the diode rectifier bridge is reduced, which simplifies design of the high frequency transformer, improves efficiency and reduces cost.

Description

technical field [0001] The invention belongs to the technical field of DC switching power supply, in particular to a DC switching power supply with adjustable output in a wide range. Background technique [0002] DC switching power supply is widely used in various electronic equipment, and in some special application fields, such as the research and development of electronic equipment and laboratory test power supply, it is required that the power supply has a wide output adjustment range and good voltage regulation accuracy. , a certain output power and perfect protection function. This kind of power supply often needs power factor correction. After adopting PFC technology, the DC voltage is about 400V, and the output voltage varies from tens of volts to hundreds of volts. At the same time, it can also achieve isolation and large power output, and has the limitation of constant power requirements, which makes the design and implementation of switching power supply systems ...

AI Technical Summary

Problems solved by technology

In the existing methods, the frequency conversion or resonance method needs to change the frequency, which increases the difficulty of designing the transformer and filter; the method of changing the transformation ratio of the transformer by switching the switch only increases the voltage adjustment range, which is not suitable for large-scale applications. In the case of voltage or high current; the control method of misalignment can realize the smooth transition of voltage regulation, but the regulation range is limited

[0003] The circuit that changes the transformation ratio of the transformer by adding switching power switches and increases the voltage regulation range is applied in the front-end converter of the distributed power system, but its voltage regulation range is limited, which cannot meet the requirements of a large output range and constant power. Control requirements, but there is no report and research on the DC switching power supply whose output voltage and current change in a wide range

Images