9907-164 | WOODWARD | Power switching devices

Description

9907-164 | WOODWARD | Power switching devices

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When the 9907-164 switching power supply operates in hard switching mode, the voltage and current waveforms of the power switching devices overlap during the switching process, resulting in high switching losses. High frequency can reduce the volume and weight of inductive and capacitive components, but the higher the switching frequency, the greater the switching loss. Therefore, measures must be taken to improve the efficiency of high switching frequency DC/DC converters. People have studied the technology of non overlapping voltage and current waveforms of switching devices during the switching process, known as zero voltage switching (ZVS) and zero current switching (ZCS) technology, collectively known as soft switching technology (compared to PWM hard switching technology). In addition to reducing switching losses, the application of soft switching technology can also greatly reduce the noise of switches and reduce the electromagnetic interference of switching power supplies to the outside world.

In the mid-1990s, after adopting phase-shifting full bridge 9907-164 technology, the 30A/48V PWM DC/DC converter weighed 7kg, a 40% decrease in weight compared to similar products using PWM technology. The development and application of soft switching technology have improved the efficiency of switching power supplies. It is said that recently, the total efficiency of low-power DC/DC converter switching power supply modules (48/12V) abroad can reach 96%; The efficiency of the 48/5V DC/DC converter switching power supply module can reach 92% to 93% At the end of the century, domestically produced communication power supply modules with output of 50-100 A and full bridge phase-shifting ZVZCS-PWM had an efficiency of over 93%.

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