FM resonant voltage test XLPE power development

The article introduces the pulse width control of LC test method for resonance series aim at capacitance characteristics of cross-linked polyethylene cable. Proved by theoretical analysis and calculation using pulse width control technology can be obtained on the same sine wave voltage, and conduct the simulation. The simulation results demonstrate the correctness of the theoretical analysis, the design of the control circuit based on SG3525 chip, and a systematic test results show that the performance of the various parts of the circuit performance achieve the expected requirements.