By hvhipot 
Variable frequency power supply is an essential equipment in the variable frequency series resonant withstand voltage test device. The variable frequency power supply is equipped with special shock-absorbing rubber support feet and protective aluminum boxes inside and outside, which can effectively reduce the vibration during transportation and the impact during lifting. Ensuring the long-term stability and reliability of the variable frequency power supply. It has multiple protection functions such as high voltage overvoltage protection, low voltage overcurrent protection, overcurrent protection, as well as detuning protection, zero position, flashover protection, emergency stop, and undervoltage protection.
As the core part of the series resonant withstand voltage test system, the variable frequency power supply independently regulates voltage and frequency, with an output voltage of 0-400 V and a frequency of 30-300 Hz. It outputs pure PWM wave signals with high stability and strong anti-interference ability in the field environment.
In the early development of frequency and voltage regulation control technology, PAM method was often used. Therefore, the AC voltage waveform output by the inverter of the variable frequency power supply can only be a square wave. Changing the effective value of the square wave can only be achieved by changing the amplitude of the square wave, that is, the amplitude of the intermediate DC voltage. With the emergence of fully controlled fast switching devices such as GTR, IGBT, MOSFET, etc., it gradually developed into PWM mode. Due to the fact that adjusting the duty cycle of the PWM wave can regulate the voltage amplitude, the inverter can simultaneously complete voltage and frequency regulation tasks, eliminating the need for rectifier control. The equipment structure is simpler and the control is more convenient. The output voltage has been improved from a square wave to a PWM wave, reducing the low order harmonic content of the output voltage.
HV Hipot Electric Co., Ltd. specializes in the production of series resonance (also known as AC withstand voltage test equipment) and has been engaged in the electrical measurement industry for many years. Its products have first-class quality and welcome customers to come and purchase.