Design and Development of a Digital Controlled Dielectric Barrier Discharge (DBD) AC Power Supply for Ozone Generation

A digital controlled dielectric barrier discharge (DBD) AC power supply is designed and investigated. The power source design with a diode bridge rectifier and PWM inverter along with driver circuit are presented. A step up transformer is designed to carry 4.6kW and 10 kVp-p for a dielectric barrier discharge (DBD) AC power supply and for ozone generation. An STM (STMicroelectronics) microcontroller is employed to control the phase shift angle of the PWM (Pulse Width Modulation) inverter. The operating frequency of the PWM inverter is 25 kHz. Zero voltage detection can be reached and achieves maximum efficiency. In addition, a high voltage transformer is included The practical results shown that the DBD power supply can be controlled at the chosen value and extreme efficiency can be 87.45 % at 4.6 kW/10 kVp-p

One-Pot Hydrothermal Synthesis of Novel Cu-MnS with PVP Cabbage-Like Nanostructures for High-Performance Supercapacitors

This paper reports the facile synthesis of a novel architecture of Cu-MnS with PVP, where the high theoretical capacitance of MnS, low-cost, and high electrical conductivity of Cu, as well as appreciable surface area with high thermal and mechanical conductivity of PVP, as a single entity to fabricate a high-performance electrode for supercapacitor. Benefiting from their unique structures, the Cu-MnS with 2PVP electrode materials show a high specific capacitance of 833.58 F g−1 at 1 A g−1, reversibility for the charge/discharge process, which are much higher than that of the MnS-7 h, Cu-MnS, and Cu-MnS with 1 and 3PVP. The presence of an appropriate amount of PVP in Cu-MnS is favorable for improving the electrochemical performance of the electrode and the existence of Cu was inclined to enhance the electrical conductivity. The Cu-MnS with 2PVP electrode is a good reference for researchers to design and fabricate new electrode materials with enhanced capacitive performance