With this technique, thedownhole load can be supplied with the maximum power at a constant surface voltage, and also the effects of poor insulation of downhole load circuit can be greatlyreduced.

• 采用该技术能使井下负载在地面供电电压不变的条件下获得最大的功率并且能大大减弱井下负载电路绝缘性能不良的影响。