An Efficient Active Mains Rectifier Bridge Based on Bipolar Technology

Mains rectifier bridges are typically used in 100 - 240 V(RMS), 50 - 60 Hz utility mains operated systems. Traditionally these bridges consist of 4 individual silicon pn-junction diodes. Although this rectification method is simple and straightforward, power loss in the diodes can be substantial. The combination of bipolar semiconductor technology and an innovative driving method enables the implementation of a cost-effective and efficient active mains rectifier bridge using silicon bipolar junction transistors (BJTs). With the new Graetz-like rectifier bridge in the rectification stage of a power converter, the bridge power dissipation can be reduced by 70% and the overall system efficiency is increased by 0.5% to 1.0%. The power saving allows for more compact equipment design and, in power converters that are in continuous operation, the active bridge pays for itself within one year through energy savings.