Design of VHF micro-EDM discharge state detection method based on energy coupling detection

Abstract

Abstract Because the pulse frequency of VHF micro-EDM power supply (30MHz-300MHz) is higher than that of traditional EDM power supply and the pulse has two characteristics of positive and negative bipolar, it is impossible to use traditional discharge state detection technology to meet the requirements of VHF discharge state detection. And during the experiment, it was found that the resonant frequency of VHF pulse would migrate with the change of circuit impedance, leading to the change of pulse voltage amplitude. In order to breakthrough the limitations of traditional detection method, this paper combined the technology of EDM discharge state recognition and microwave detecting technology, based on the principle of electrode impedance change, put forward a discharge condition detection method of VHF pulse source based on energy principle of coupling detection, the method using double directional coupler and rf receiver device for detecting pulse energy, It can detect the interelectrode power of VHF pulse source with frequency range from 30MHz to 300MHz and power range below 100W, and realize accurate discharge status identification of VHF micro-EDM.