This permits the SCR to control only half of the AC positive wave; halfvoltage is applied to the load when the SCR initially fires.
这使得SCR来控制交流正波的一半,另一半的电压施加到在SCR初始触发该负载。
2
DIS has its own drawbacks by having half of the plugs firing with an acceptable negative voltage, while the other half is fired by the less acceptable positive polarity.
DIS有自身的缺点,由于有一半的插头接通一个可接受的负电压,而另一半接通不太能接受的正极。
3
Together these four sectors accounted for more than half of all medium voltage drive revenues in 2008.