A new drive circuit for igbt is designed . it features high switching frequency , high driving power , simple - structure and reverse - turn - off 论文中还设计了一种新型的igbt驱动电路，它具有开关频率高、驱动功率大、结构简单且具有负压关断的特点。
In many circuit , this reverse current does not affect the convert characteristic and so the diode can also be considered as ideal during the turn - off transient 在许多的电路中，二极管反向电流不会影响换流器特性，因此在关断过程中仍然可以视为理想的。
It can be used for water return of radiator , balance water flew and cut off system . available for : 3 / 4 " , 1 / 2 " / style : straight valve , angle valve 散热器回水节流阀，应用于散热器回水口，可平衡系统流量，并可关断系统。规格及型号： 3 / 4 ” 、 1 / 2 ”型式：直型、角型。
Only when the anode current tries to go negative under the influence of the circuit in which the thyristor is connected does the thyristor turned off and the current go to zero 只有当阳极电流在与晶闸管连接的电路的作用下开始变负时，晶闸管才会关断且流过其的电流为零。
The design concept of the automatic security shutoff is a hinged door closing onto a knife - edged seat fully contained in a high - grade ductile iron body ( or steel casting ) 自动安全关断的设计原理是由内置于高品质延性铸铁?或铸钢?阀体，以铰闩的阀门闭锁在一具有刃缘的阀座上。
The driving circuit uses exb841 that is very popular to magnify and separate the six spwm signals , and easily to control the switch on or off of six igbts in inverter bridges 驱动电路则是采用了目前较为流行的exb841驱动芯片，对spwm信号放大隔离后，去驱动逆变桥中六支igbt ，使其导通和关断。
High amplitude trigger pulse meets the power requirements of many thyristors connected in parallels . the voltage peak emerged in switching off inductance circuit is amortized by resistor and capacitor absorbed circuit 选取r = 54 ， c = 0 . 22 f的阻容缓冲吸收电路有效降低了快速晶闸管关断感性负载产生的过电压。
In all interleaving two - transistor forward switches , zero voltage switching can be obtained which can apparently improve the power density . however the isolated boost converters need to resolve two problems 但是隔离boost变换器需要重点解决两个问题: 1 )减小功率开关关断时两端浪涌电压; 2 )隔离boost变换器的起动。
Aiming to some electrical parameters like turn - on time and turn - off time which are difficult to be tested we put forward many new test methods and analyze their test course in detail 在测试系统中，采用powerbuider7 . 0进行电参数的数据库设计，存储电参数的标准和测量数据。最后详细分析了测试较为复杂的接通关断时间的测试过程。
First of all , the main - switches of the zvs chopper have zero - voltage turn - on and turn - off totally , so it has little switching losses . for this , the efficiency of the chopper can be improved 首先,零电压软开关斩波器的主功率器件完全实现了零电压开通和关断,所以它的热损耗很小,减小了系统的热损耗,提高了系统的电源变换效率。
