Özet:

The study aimed to develop a low-cost high voltage circuit for laboratory uses and compare its performance with a commercial one in the electrostatic charging of spray droplets. Because the Cockcroft-Walton voltage multiplier is considered the simplest and cheapest, it was used to design this circuit. Two d.c-a.c inverters (high and low frequencies) and capacitors with two capacities were used in the development of the circuit. The circuit was loaded with different electric current values to study the effect of the capacitor capacity and frequency value on the circuit's output voltage, output voltage ripple, and response time. According to the results, loading the circuit developed with a low-frequency inverter and low-capacity capacitors by current, even including the microampere, seriously affected the output voltage and the voltage ripple. However, a 20 kHz high-frequency inverter and 470 nF capacitors significantly improve output and ripple voltage at different load currents. Also, they reduced the response time from 15 sec to 40 msec. The developed high-voltage circuit can provide the same efficiency in water droplet charging compared with the commercial one. Moreover, this developed circuit was enhanced to provide a high voltage value until 15 kV.