The control scheme and operating principle of a double closed-loop AC/DC power converter system are discussed by using physics.

从物理角度讨论了双闭环交/直流功率变换器系统的控制方案和工作原理。

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8 min An operator notices that the valves for the backup pumps in the secondary loop are off. He opens the valves. The secondary side now operating normally.

8分钟一个操作员注意到二次回路备用水泵的阀门是关的，于是打开了阀门。二次回路现在运作正常。

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Vehicles spend a period of time in an Open Loop air-fuel ratio programming until the oxygen sensors heat up to proper operating temperature of approximately 316 degrees Celsius.

汽车需要在开环空燃比程序上花费一段时间以达到氧传感器的工作温度大约为316摄氏度。

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Brazil's crisis shows a deflationary feedback loop that began with Thailand is still operating.

CNN: BRAZIL'S BOMB

He's got a crush on his computer operating system, named Tammy, and has the great misfortune of getting stuck in a time loop.

CNN: How to escape a time loop