ABB 5SHY5055L0002 3BHE019719R0101 GVC736BE101 控制系统

ABB 5SHY5055L0002 3BHE019719R0101 GVC736BE101 控制系统

观察到阳极（A）相对于阴极（K）为负。这个

大门一直开着。SCR中有三个PN结：J1、J2和J3。由于此反向

则结J1和J3也被反向偏置。并且结J2是正向偏置的。可控硅

由于这种反向偏置而不导通。一个非常小的电流从阴极流到阳极。

这个电流被称为可控硅的反向泄漏电流。这种模式被称为反向

阻塞模式。

SCR的V-I特性的上图显示了SCR的反向特性

阻塞模式。

观察反向电压增加，但电流非常小。反向故障时

反向电流迅速增加。在反向击穿时

晶闸管两端存在高电压，大电流流过晶闸管。因此功率大

在晶闸管中发生耗散。由于这种耗散，结温度

超过允许值并且SCR损坏。因此

SCR不应超过VBR。

在反向阻断模式期间，不应施加正栅极信号。如果

正信号被施加在栅极和阴极之间，结J3被正向偏置。因此

电流开始流过它。这个电流增加了可控硅的反向漏电流。

因此，耗散也增加了。

ABB 5SHY5055L0002 3BHE019719R0101 GVC736BE101 控制系统

The anode (A) is observed to be negative with respect to the cathode (K). this

The gate remained open. There are three PN junctions in SCR: J1, J2, and J3. Due to this reverse

Junctions J1 and J3 are also reverse-biased. And the junction J2 is forward-biased. thyristor

It does not conduct due to this reverse bias. A very small current flows from the cathode to the anode.

This current is called the reverse leakage current of the thyristor. This pattern is called reverse

Blocking mode.

The above diagram of the V-I characteristics of the SCR shows the reverse characteristics of the SCR

Blocking mode.

The reverse voltage is observed to increase, but the current is very small. Reverse failure time

The reverse current increases rapidly. During the reverse breakdown

There is high voltage at both ends of the thyristor, and large current flows through the thyristor. So high power

Dissipation occurs in the thyristor. Due to this dissipation, the junction temperature

The allowed value is exceeded and the SCR is damaged. therefore

The SCR should not exceed the VBR.

The positive grid signal should not be applied during the reverse block mode. if

A positive signal is applied between the grid and cathode, and junction J3 is positively biased. therefore

Electricity begins to flow through it. This current increases the reverse leakage current of the thyristor.

As a result, dissipation also increases.

ABB 5SHY5055L0002 3BHE019719R0101 GVC736BE101 控制系统

Harmony/ INFI 90，安全系统

②modicon(莫迪康)140系列产品CPU模块

③General electric(通用电气)系列产品 IC693 IC695 IC697 IC698

继电保护SR469开头 SR369开头 SR489开头 SR750开头

IS200/IS215/IS220/IS420/DS200/DS215/VMIVME开头 7750 7807

④Ticonex (英维思）系列产品 3721,3503,4351B,3625,3009

⑤Bently (本特利）3500系列大卡小卡 1900系列电源模块

3500/15 3500/20 3500/22M 3500/42M 3500/25 3500/32 3500/53

⑥Allen-Bradley(美国AB)系列产品1394开头2711开头1756,1747等

⑦ EMERSON ?/Westinghouse(艾默生美国西屋)系列产品OVATION系统、WDPF系统、MAX0系统备件。

DELTAV德尔塔夫VE3008/CE3008 /SE3008/VE3007/VE3006 SE4006P2

⑧Foxboro(福克斯波罗)：I/A Series系统，FBM(现场输入/输出模块)顺序控制、梯形逻辑控制、

事故追忆处理、数模转换、输入/输出信号处理、数据通信及处理等 FCP270/FCP280/FBM201…FBM242

⑨Woodword?9907-167? 9907-164 9907-165? 5464-414? 5466-316? 5501-467 5501-开头? 8444-开头

⑩Bosch Rexroth(博世力士乐)：Indramat，I/O模块,PLC控制器,驱动模块等。

Motorola(摩托)：MVME 162、MVME 167、MVME5500、MVME6100等系列。

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