Why does the input single -phase electric output become three -phase electricity

Variable Frequency Drive (VFD) can convert single -phase electricity into three -phase electricity, which is due to its working principle and functional design. The following is the basic process of the transformation of the inverter:


Rectification:


Input single -phase AC power: The input terminal receiving single -phase AC power supply (such as 110V or 220V) of the inverter.

Rectifier circuit: The rectifier circuit inside the inverter converts single -phase AC power to DC power. This process is usually completed using a diode bridge rectifier, which can rectify the positive and negative of AC power into DC power.

Filter:


Smooth DC power: The DC electricity after rectification will be smooth through the filter (usually a capacitor) to reduce the pulse in DC and obtain a stable DC power supply.

Reverse:


Reverse Circuit: DC electricity after rectification and filtering will enter the inverter circuit. The inverter circuit converts DC electricity into three -phase AC power through switch components (such as IGBT or MOSFET).

PWM control: The inverter uses the Pulse Width Modulation (PWM) technology to generate three -phase AC power. PWM technology adjusts the frequency and amplitude of the output voltage by controlling the turnover and control of the switch component, thereby generating the required three -phase AC power.

Output three -phase electricity:


Three -phase power supply: The inverter circuit can generate three -phase current. These three -phase current have appropriate frequency and voltage, which can drive three -phase motor or other three -phase equipment.

Advantages of the inverter:


Frequency adjustment: The inverter can not only convert single -phase electricity into three -phase electricity, but also adjust the frequency of the output, which is very important for controlling the speed of the motor.

Energy saving: By adjusting the operating speed and load of the motor, the inverter can optimize energy consumption and reduce energy waste.

Protection function: Inverter usually has a variety of protection functions such as overload protection, short -circuit protection, and overheating protection, and improves the safety and life of the equipment.

Therefore, in the process of rectification, filtering, and inverter, the inverter converts the input single -phase AC electricity into a three -phase AC power that can drive the three -phase motor.