3500/42M | BENTLY NEVADA | Half bridge structure module

Description

3500/42M | BENTLY NEVADA | Half bridge structure module

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The most popular traditional design methods are single switch forward, double switch forward, and half bridge structures. The 3500/42M structure provides a stable solution to meet current needs. However, as mentioned above, emerging standards require power sources to achieve higher efficiency than before. In the past, a typical desktop computer power supply could achieve a maximum efficiency of 60% to 70%, but now it is required that the power supply can achieve a minimum efficiency of 80% at 20%, 50%, and 100% of the rated load. Meanwhile, there has been a recent trend towards achieving 70% or more performance at loads below 20%, and standby power consumption can continue to decrease. We will explore the advantages and disadvantages of three traditional topologies and introduce two new topologies.

The topology shown in Figure 1 is quite popular. The main reason for the 3500/42M is the small number of components and simple design requirements, but the high efficiency requirements for different load situations bring new challenges to this topology. When approaching full load or full load, the performance of this topology is limited by a 50% duty cycle. At lighter loads, switch losses are the main reason for poor performance. Many newer designs use power factor correction (PFC) front-end to reduce harmonic currents. At a PFC output voltage of 400 V, the single switch forward mode is forced to use switches greater than 900 V, increasing the cost of FETs.

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