Double-excitation synchronous non-inductive rectifying circuit

Abstract

The invention relates to a double-excitation synchronous non-inductive rectifying circuit. A brand-new double-excitation synchronous non-inductive rectifying technology is created and disclosed. The circuit comprises double high-frequency isolation transformers, secondary rectifying MOS transistors and secondary output capacitors. A converter primary circuit is a double-excitation circuit, and the double-excitation synchronous non-inductive rectifying technology is adopted for a converter secondary circuit. According to the technology, the synchronous rectifying function of an active clamp circuit secondary rectifying circuit is achieved through the double-excitation combination thought, the double-excitation MOS transistors are conducted in a staggered mode through synchronous triggering, conducting voltage drop of common rectifier diodes is reduced, and a follow current inductor needed for secondary output of a forward circuit is omitted through a flyback voltage transformation secondary inductor. The problem that the voltage drop power consumption of a low-voltage high-power output rectifier tube is large in a double-excitation circuit is solved. The problems that a traditional low-voltage converter is large in output size and low in efficiency are solved. According to the technology, it is achieved that the size of a low-voltage direct current output power source is reduced by 30% and the efficiency of the low-voltage direct current output power source is improved by 8% under the same power and electric parameters.

Description

Technical field [0001] The present invention belongs to the field of secondary rectifier circuits of switching power supply, which involves a dual excitement synchronization without sensory rectifier circuit. Background technique [0002] Synchronous rectification technology is a hotspot in recent years. It is mainly used in the field of low -voltage and large currents. The purpose is to solve the problem of on -demand loss of the continuous flow pipe.The general diode continuity is adopted, and its turnover resistance is large. When it is applied to large current occasions, it consumes a lot.The MOS tube with a very small cross resistance instead of the diode can solve the loss problem, but at the same time put forward higher requirements for the drive circuit. [0003] At present, the secondary rectifier circuit of the switching power supply at home and abroad is commonly used: positive stimulus synchronous rectifier circuit, half -bridge synchronous rectifier circuit, and the ...

AI Technical Summary

Problems solved by technology

[0004] The present invention creates a brand-new secondary synchronous rectification technology in the field of switching power supplies at home and abroad, that is, the secondary side of the double-excited double-transformer is respectively designed as a new synchronous rectification structure with the same name end complementary, aiming to solve the problem of traditional double-excited circuit secondary The bottleneck of synchronous rectification and the disadvantages of large output volume and low efficiency of traditional low-voltage converters

Images