【选型】IGBT驱动有源钳位设计中TVS管选型建议
在电力电子设备中,通常由于系统中寄生电感的存在,在IGBT开关器件关断时,会伴随着尖峰电压的产生。为了保护IGBT在关断过程中不会被高电压击穿,一般会推荐添加有源钳位电路,常见的方式如图一所示。
图一 常见有源钳位电路
那么问题来了,TVS该如何选型呢,下面给出选型的几点建议:
1:受TVS技术的限制,一般采用多个TVS串联的方式;
2:在TVS选型时,主要考虑的是反向击穿电压Vbr(工作点电压),而不是反向峰值电压;串联后反向击穿电压之和要高于实际的母线电压,低于被保护的IGBT安全电压;
3:TVS是正温度特性,温度系数大约是千分之一,所以选型中最好按最低温度去选择门槛电压;
4:根据估算的承受能量选择TVS合适的封装,常见的有SMA-400W,SMB-600W,SMC-1500W。
举例说明:
在母线电压1200V的应用中,IGBT等级一般选择1700V,工业环境的温度范围一般为-45~85℃。
假如采用6个TVS管串联,留出10%裕量,那么串联后的击穿电压约为1.1*1200=1320V,可以得出每个TVS管的反向击穿电压Vbr为1320/6=220V。可以选择丽正国际的TVS管SMBJ190A或SMBJ200A,参数如下图所示,最低反向击穿电压都大于1200V。
图二 TVS管电气参数
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描述- RECTRON有限公司是由一批经验丰富的半导体工程师,成立于1976年1月在涂成,台北。地方融资,RECTRON很快成为质量分立半导体认可的供应商。1981年,RECTRON增加销售收入通过独家分销商和代理商网络在全球半导体市场的直接访问。扩展排在1994年初的时候RECTRON委托中国工厂,以提高竞争优势,并增加分立器件产品的制造能力。
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型号- SMF51A,SMF75A,SMF43A,SMF11A,SMF15A,SMF19A,SMF170A,SMF150A,SMF190A,SMF90A,SMF70A,SMF130A,SMF 7.5A,SMF110A,SMF30A,SMF10A,SMF54A,SMF7.0A,SMF22A,SMF78A,SMF,SMF 6.0A,SMF14A,SMF58A,SMF26A,SMF8.5A,SMF18A,SMF85A,SMF 6.5A,SMF33A,SMF45A,SMF13A,SMF17A,SMF160A,SMF140A,SMF180A,SMF80A,SMF60A,SMF120A,SMF40A,SMF100A,SMF20A,SMF64A,SMF 8.0A,SMF5.0A,SMF12A,SMF24A,SMF9.0A,SMF36A,SMF48A,SMF16A,SMF28A
Single Line Bi-directional TVS Diode TEP12CM Offers Peak power Dissipation of 5600W (8/20μs) and Working Voltages of 12V
The TEP12CM TVS diode is designed to replace multilayer varistors (MLVs) in portable applications such as cell phones, notebooks, and PDA‘s. It offers superior electrical characteristics such as low clamping voltage, low leakage current and high surge capability. It is designed to protect sensitive electronic components which are connected to power lines, from over-stress caused by ESD (Electrostatic Discharge), EFT (Electrical Fast Transients) and Lighting.
产品 发布时间 : 2024-01-06
【产品】 工作电压为3.3V ~ 36V的双向TVS二极管阵列TEPMxxC系列
丽正公司推出的双向TVS二极管阵列 TEPMxxC系列,用于需要瞬态过压保护功能的应用。 TEPMxxC系列专门用于保护连接到电源,数据线和传输线的敏感组件,使其免受ESD(静电放电),CDE(电缆放电事件)和EFT(电快速瞬变)引起的过压,通过保护信号完整性来确保网络通信的可靠性,它们非常适用于电路板空间极其狭小的情况。可被用于计算机,打印机,商用机器,通信系统,医疗设备等应用。
新产品 发布时间 : 2019-10-27
【产品】超小SOD-323封装超低电容双向TVS管阵列TABxxLC,电容值典型值仅有0.8pF
丽正国际推出的超低电容双向TVS管阵列TABxxLC,主要包括:TAB03LC、TAB05LC、TAB08LC、TAB12LC、TAB15LC、TAB18LC、TAB20LC、TAB24LC共8个型号,用于保护便携式电子设备和智能手机等应用,该系列有 单向和双向 配置,峰值脉冲功率为350W(8/20μs波形)。
新产品 发布时间 : 2019-10-18
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