Design Of Power Supply And Charging Equipment Applied To Electret Experiment

Electret is a material that researchers are increasingly concerned in recent years, it is widely used in the field of sensors and biomedical fields by means of good performance of stored charge and electrical external electric field. But so far the electret material potential has not been fully excavated, research and exploration of the electret is still the current research focus. The main content of this study is to design a test power supply and an electret charging system to dig the potential applications of electret material.This paper is divided into two parts, the first part is to design an electret charging device, and the second part is to design an electret power supply. Electret power device is divided into four parts of main circuit, control circuit, high-frequency transformer and voltage double rectifier circuit.Design of charging device is based on the principle of screw lifting and flexible electrodes. Determined specifications based on Variables as single-needle discharge power and discharge power density, and then complete the electret charging device production.Design of the power system is divided into a needle electrode and gate power supply. Needle electrode and gate power supply unified design in the main circuit and control circuit. Two high-frequency power transformer and voltage double rectifier circuit design in high-voltage module are designed separately. In the main circuit section, I determined to make the half-bridge inverter circuit as a main circuit; In the control circuit section,I design half-bridge transformer driver circuit;In the high-frequency transformer section,I analyzed the causes of the transformer and distribution parameters and its harm through the establishment of high-frequency transformer model, reduce the distributed parameter by using segmented methods of transformer twining. Meanwhile, analyze the structure of the transformer, choose cores of the UY20/64 type and PC40EE42/42/15-Z type as the cores of needle electrode and gate power supply transformer and calculated parameters which are needed by this study, finally, get the optimal design of high-frequency transformer; In the voltage double rectifier circuit section, I determined the multiples of voltage double rectifier circuit according to the requirements of needle electrode and gate power supply, after the analysis of the voltage double rectifier circuit capacitance effects, simulate the circuit with Psim,and get the impact of the output waveform with different capacitances, and then complete the voltage double rectifier circuits.This article completed charging equipment and Power supply equipment. The experiments prove that the needle electrode power supply output voltage continuously adjustable in 0～-20kV and the gate power supply output voltage continuously adjustable in 0 ～-1500V, power supply Equipment meets the design requirements.