The 3500/92 half bridge transformer is another option for high power requirements. Unlike single switch or double switch forward transformers, half bridge transformers can operate in two quadrants and reduce the current of the primary FET. The composition structure and output rectification of transformers are more complex than a single forward topology structure, and there are also high switching losses.

Emerging topological structures

In order to meet higher efficiency requirements, the industry has developed several new topology structures. These new circuit topologies do not necessarily refer to new inventions, but rather recent large-scale commercial applications. Among them, the two most valued topologies are active clamp forward and dual inductor capacitor (LLC).

Active clamp forward excitation

The active clamp forward topology of 3500/92 is a long-standing soft switching structure. Although this structure is similar to traditional forward topology, it has always been regarded as a difficult to implement structure in the past, and is mainly used in special fields such as telecommunications. However, with the launch of new ICs, the implementation of this structure has become very simple.