众所周知,GaN 功率器件具有传统功率器件无可比拟的性能优势,如大幅提升的开关速度和显著降低的开关损耗,从而提供更优的整体效率,这使得GaN 器件在高频、高效率的应用中展现出明显优势。我们的应用指导将帮助客户更好地使用云镓的 GaN 器件,更大限度去挖掘云镓的 GaN 器件的能力。本次发布云镓应用手册第三弹: GaN FET loss calculation (Boost converter)。此外,客户可以通过云镓半导体官方网站或者微信公众号了解到更多云镓 GaN 产品资讯和相关技术文档。
Part 1: Basic information
01
Zero Qrr enables GaN to work in CCM TP-PFC?

In each half cycle of the AC input, the TP-PFC can be analyzed as a synchronous boost converter.
02
Synchronous CCM boost converter – waveforms


Part 2: Detailed analysis
01
Loss breakdown of a boost

02
Loss breakdown of GaN FETs: SW conduction loss

03
Loss breakdown of GaN FETs: SW+SR Coss loss


CloudSemi GaN has a superior Qoss comparing to other GaN vendors.
04
Loss breakdown of GaN FETs: SW I-V overlap loss

05
Switching time - tir

06
Switching time - tvf

07
Switching time – tvr & tif

08
Loss breakdown of GaN FETs: SR conduction loss

09
Loss breakdown of GaN FETs: SR deadtime loss

Part 3 : Summary
01
Summary


图腾柱 PFC 效率计算可以参考 Boost 损耗计算方式,在此不再赘述。
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