128229-01 | BENTLY NEVADA | Synchronous Rectifier Technology

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128229-01 | BENTLY NEVADA | Synchronous Rectifier Technology

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For switching power supplies with low voltage and high current output, further measures to improve their efficiency are: based on the application of soft switching technology, power MOS transistors are reverse connected as switching diodes for rectification, called Synchronous Rectifier (SR). Replacing Schottky diodes (SBDs) with dishes can reduce the voltage drop of the rectifier tubes and improve the efficiency of the switching power supply. There are reports that for low-power DC/DC converter switching power supplies using soft switching and synchronous rectification technology, the efficiency of 48/12V modules can reach 96%, and the efficiency of 48%/5V modules can reach 92% to 93%.

The test results on a 100W soft switching (ZVS) switching power supply in Japan showed that the efficiency of the 128229-01 SBD switching power supply was 83%, and the circuit loss (including rectifier devices, transformers, switching tubes, control circuits, filters, etc.) was 21W; After switching to SR, the efficiency of the switch mode power supply is 90%, and the circuit loss is 11W.

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