In order to solve the problems of the magnetic components and terminals of the traditional multiple synchronous rectifiers, integrated magnetic technology is applied in this topology. The topologies of several magnetic current rectifiers are compared. Finally, the experimental models and experimental waveforms of 1V and 20W dc/dc converters are given.
In the DC/DC converter, due to its own characteristics, the dual current rectifier topology has become the optimal output rectification topology. Compared with the traditional mid-tap rectifier topology, its transformer side has only one set of windings and a relatively simple structure. At the same time, the number of turns of the CDR side winding is also less. In the case of high current, the loss of the secondary winding is reduced. The output has two filter inductors, and only half of the load current passes through each inductor current, so the output filter inductor has a small power loss, because there are two filter inductors and the output current/voltage fluctuation of the converter is relatively small. But it requires three magnetic elements, which inevitably leads to an increase in volume, thereby reducing power density. At the same time, there are many wiring terminals. When the current is large, the power loss on the terminals must be relatively large. In order to overcome these shortcomings, integrated magnetic technology is used in the CDR topology. The so-called magnetic integration is a converter in which two or more independent magnetic components (transformers, input/output filter inductors) are in the magnetic core to reduce the volume and increase the power density and reduce the terminals.
The time-current synchronous rectification topology has been widely used in high-current converters, but there are large defects in the structure of traditional magnetic components. In order to overcome these shortcomings, magnetic integration technology has been used in this topology. It was applied. This article compares and compares the multi-current rectifier structures, and gives the corresponding experimental circuit models. Under heavy load, the energy stored in the primary leakage inductance of the transformer can be used to realize the self-driving of the secondary synchronous rectifier