In terms of power supply, everyone may know that inverter and inverter power supply are auxiliary equipment for charging electrical appliances, but many people don’t know what inverter power supply is and what inverter is. With the continuous progress of the times, electrical appliances will be constantly updated, and auxiliary equipment will be constantly changing. Below we will introduce the difference between frequency converter and frequency conversion power supply in detail and how to choose frequency converter.
First of all, let’s understand, what is a variable frequency power supply? The frequency conversion power supply converts the alternating current of the main power supply from AC→DC→AC to pure sine wave. The output frequency and voltage can be adjusted within a specific range. It is different from the frequency conversion governor used for motor speed control, and it is also different from the ordinary AC power supply. The ideal AC power supply has the characteristics of stable frequency, stable voltage, zero internal resistance and pure sine wave (no distortion) of voltage waveform. Frequency conversion power supply is very close to the ideal social AC power supply, so more and more advanced cultural development areas use frequency conversion power supply as standard power supply, which provides a superior power grid environment for public utilities and helps to objectively evaluate the performance of electrical equipment and technical products. According to the different structure, there are two types of variable frequency power supply, namely linear amplifier and SPWM switch type.
What is a frequency converter? The frequency converter is composed of AC-DC-AC (modulated wave) and other circuits. The standard name of the frequency converter is variable frequency governor. Its output voltage waveform is a square wave pulse and several higher harmonic components. The voltage and frequency are not adjusted separately, but change proportionally, which can not meet the requirements of AC power supply. Usually, it can’t be used as a power supply, and it is usually only used for speed regulation of three-phase asynchronous motors.
Because the whole circuit of variable frequency power supply is composed of information exchange -DC-AC- filter, the signal waveforms of output voltage and current are pure sine waves, making it an ideal AC power supply system in society. It is very easy to approach the social ideal AC power supply system.
Principle and main function of frequency converter: Frequency converter is a kind of power control equipment, which uses the on/off operation of power semiconductor devices to convert the power of industrial power supply to another frequency. It can be divided into AC-AC inverter and AC-DC-AC inverter. AC-AC inverter can directly convert alternating current into alternating current with variable frequency and voltage. The AC-DC-AC frequency converter first rectifies alternating current into direct current through a rectifier, and then converts the direct current power supply into alternating current with variable frequency and voltage through an inverter.