The operation principle and oil distributing rule are introduced by expansion method. The features of closed and opened oil circuit are discussed briefly.
本文用展开法介绍其工作原理与配油关系，并扼要讨论闭式与开式油路的特点。
2
The chip of TL494 functions very strong, and its operation frequency is high. The double closed loop control of output voltage and current is realized by integrating some simple hardware circuit.