string drive

The feature of the progressive cavity pump mobile intermittent recovery technique is using a tractor as power unit, adopting a double universal coupling transmitting the power to a drive head to make the rod string rotate and thereby drive the progressive cavity pump for pumping.

新开发的螺杆泵机动间歇采油技术及设备的主要特征是用拖拉机做动力源，用双万向联轴器把动力传递给驱动头，由驱动头带动抽油杆柱旋转，进而驱动螺杆泵旋转抽油。

The main circuit used SEPIC topology and pulse constant current drive mode. It has PWM dimming function and is suitable for driving high power LED lamp string.

该电路主电路采用sepic拓扑，脉冲恒流的驱动方式，具有脉冲频率调制（PFM）和脉冲宽度调制（PWM）调光等功能，适合驱动大功率LED灯串。