Article(id=1196101743474946214, tenantId=1146029695717560320, journalId=1189918454225211397, issueId=1196101740056593123, articleNumber=null, orderNo=null, doi=10.20104/j.cnki.1674-6546.20230411, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=null, receivedDateStr=null, revisedDate=1703606400000, revisedDateStr=2023-12-27, acceptedDate=null, acceptedDateStr=null, onlineDate=1763102478139, onlineDateStr=2025-11-14, pubDate=1744646400000, pubDateStr=2025-04-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1763102478139, onlineIssueDateStr=2025-11-14, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1763102478139, creator=13701087609, updateTime=1763102478139, updator=13701087609, issue=Issue{id=1196101740056593123, tenantId=1146029695717560320, journalId=1189918454225211397, year='2025', volume='', issue='4', pageStart='1', pageEnd='48', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1763102477325, creator=13701087609, updateTime=1763102749153, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1196102880244576759, tenantId=1146029695717560320, journalId=1189918454225211397, issueId=1196101740056593123, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1196102880244576760, tenantId=1146029695717560320, journalId=1189918454225211397, issueId=1196101740056593123, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=10, endPage=16, ext={EN=ArticleExt(id=1196101744108286120, articleId=1196101743474946214, tenantId=1146029695717560320, journalId=1189918454225211397, language=EN, title=Analysis of MOSFET Power Loss in Buck Switching Power Supply, columnId=null, journalTitle=Automotive Engineer, columnName=null, runingTitle=null, highlight=null, articleAbstract=
In order to calculate power loss of switching power supplies of high-performance chip in automotive centralized domain controller, this article analyzes the on and off processes of Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET), theoretically analyzes and derives formulas for the MOSFET losses of Buck type switching power supplies, and focuses on example calculation and simulation verification of the switch losses. The calculation and simulation results tend to be consistent, which can be used as a reference for hardware design engineers when selecting switch power MOSFETs.
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为实现汽车集中式域控制器高性能芯片的开关电源的功率损耗计算,分析了金属-氧化物半导体场效应晶体管(MOSFET)的导通和关断过程,对Buck型开关电源的MOSFET损耗进行理论分析及公式推导,针对开关损耗部分进行了实例计算和仿真验证。结果表明,计算结果与仿真结果趋于一致,所提出的方法可为开关电源MOSFET的选型提供参考。
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| 参数名称 | 数值 |
| 输入电压/V | 12±0.6 |
| 输出电压/V | 5±0.25 |
| 输出电流/A | 5±0.25 |
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| 参数名称 | 数值 |
| 输入电压/V | 12±0.6 |
| 输出电压/V | 5±0.25 |
| 输出电流/A | 5±0.25 |
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| 参数名称 | 规格书参数 数值 | 仿真参数数值 |
| 上管驱动电压高电压/V | 4.85 | 5.35 |
| 上管驱动电压低电压/V | 0 | 0 |
| 上管驱动电阻/Ω | | 2.5 |
| 上管放电电阻/Ω | | 1.5 |
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芯片参数
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| 参数名称 | 规格书参数 数值 | 仿真参数数值 |
| 上管驱动电压高电压/V | 4.85 | 5.35 |
| 上管驱动电压低电压/V | 0 | 0 |
| 上管驱动电阻/Ω | | 2.5 |
| 上管放电电阻/Ω | | 1.5 |
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| 参数名称 | 规格书参数 数值 | 仿真参数数值 |
| 栅源电荷Qgs/nC | 3.4 | 3.4 |
| 输入电容Ciss/pF | 860~1 300 | |
| 输出电容Coss/pF | 140~1 000 | |
| 反向传输电容Crss/pF | 60~500 | 100~500 |
| 开启电压Vth/V | 1.0~3.0 | 2.6 |
| 栅极电阻Rg/Ω | 0.50~2.20 | 3.0 |
| 米勒电压Vmiller/V | 3.6 | 3.6 |
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MOSFET参数
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| 参数名称 | 规格书参数 数值 | 仿真参数数值 |
| 栅源电荷Qgs/nC | 3.4 | 3.4 |
| 输入电容Ciss/pF | 860~1 300 | |
| 输出电容Coss/pF | 140~1 000 | |
| 反向传输电容Crss/pF | 60~500 | 100~500 |
| 开启电压Vth/V | 1.0~3.0 | 2.6 |
| 栅极电阻Rg/Ω | 0.50~2.20 | 3.0 |
| 米勒电压Vmiller/V | 3.6 | 3.6 |
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| 参数名称 | 规格书参数 数值 | 计算参数数值 |
| 输入电容Ciss/pF | 860~1 300 | 1 217.3 |
| 输出电容Coss/pF | 140~1 000 | 310.8 |
| 反向传输电容Crss/pF | 60~500 | 142.5 |
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MOSFET计算参数
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| 参数名称 | 规格书参数 数值 | 计算参数数值 |
| 输入电容Ciss/pF | 860~1 300 | 1 217.3 |
| 输出电容Coss/pF | 140~1 000 | 310.8 |
| 反向传输电容Crss/pF | 60~500 | 142.5 |
), ArticleFig(id=1196211353661784650, tenantId=1146029695717560320, journalId=1189918454225211397, articleId=1196101743474946214, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 损耗时间 | 仿真结果 | 计算结果 |
| t1 | 71.4 | 88.5 |
| t2 | 44.0 | 60.8 |
| t3 | 171.6 | 114.2 |
| t4 | 179.2 | 152.1 |
| t5 | 63.1 | 49.9 |
| t6 | 86.9 | 53.6 |
| t7 | 25.2 | 42.2 |
| t8 | 166.8 | 206.5 |
| tr | 215.7 | 175.0 |
| tf | 112.1 | 95.8 |
), ArticleFig(id=1196211353724699211, tenantId=1146029695717560320, journalId=1189918454225211397, articleId=1196101743474946214, language=CN, label=表5, caption=
上管开关损耗时间的仿真与计算对比结果 ns
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| 损耗时间 | 仿真结果 | 计算结果 |
| t1 | 71.4 | 88.5 |
| t2 | 44.0 | 60.8 |
| t3 | 171.6 | 114.2 |
| t4 | 179.2 | 152.1 |
| t5 | 63.1 | 49.9 |
| t6 | 86.9 | 53.6 |
| t7 | 25.2 | 42.2 |
| t8 | 166.8 | 206.5 |
| tr | 215.7 | 175.0 |
| tf | 112.1 | 95.8 |
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