Several common sense of frequency converter

In general, a device that converts a constant voltage and frequency alternating current into a voltage or variable frequency alternating current is referred to as a "frequency converter." The first step is to convert three-phase or single-phase AC power to direct current (DC). Then convert the direct current (DC) to three-phase or single-phase alternating current (AC). In other words, the inverter can make the motor with a smaller starting current and get a larger starting torque, that is, the inverter can start a heavy load.

As we all know, inverters are used to save electricity. Although it is expensive, it has good performance, and it has basic functions such as voltage regulation, frequency regulation, voltage regulation, and speed control, and it applies modern science and technology. Its internal structure is complex but it is easy to use, so it is not only used to start the motor, but is widely used. The application to all fields, with the development of technology, the reduction of costs, I believe that the inverter must be bright and wide-ranging.

What is a frequency converter?

The frequency converter is a power control device that uses the on-off function of the power semiconductor device to convert the power frequency power source to another frequency, and can realize the soft start, frequency conversion speed regulation of the AC asynchronous motor, increase the operation accuracy, change the power factor, and overcurrent/ Overvoltage / overload protection and other functions.

The basic composition of the inverter

The frequency converter is usually divided into 4 parts: rectification unit, high capacity capacitance, inverter and controller.

Rectifier unit: Converts a fixed frequency AC power to DC power.

High-capacity capacitors: Store converted electrical energy.

Inverter: An electronic switch composed of a high-power switch transistor array converts direct current into square waves of different frequencies, widths, and amplitudes.

Controller: According to the set program, control the amplitude and pulse width of the output square wave, so that it is superimposed to approximate sinusoidal alternating current and drive the AC motor.

How does the frequency converter work?
The main circuit of the frequency converter can be roughly divided into two kinds: The voltage type is the frequency converter that converts the direct current source of the voltage source into alternating current, the filter of the direct current loop is the electric capacity. The current type is a frequency converter that converts the current from a direct current source to an alternating current, and the direct current loop filter is an inductor. It consists of three parts: a "rectifier" that converts the power-frequency power source into a direct-current power, a "fluid-wave circuit" that absorbs the voltage ripple generated by the converter and the inverter, and an "inverse" that converts the direct-current power into alternating-current power. Changer."

Therefore, the speed control process of the inverter is a process of adjusting the frequency and voltage of the inverter in synchronism. Then, its implementation is generally as follows: the AC power is first converted into DC power through the rectification current, and then the DC power is passed through the inverter circuit. , It becomes the AC power that we need, which the motor can accept, so as to achieve the purpose of frequency conversion, voltage change, and speed regulation.

The direct function of the frequency converter
By changing the voltage and frequency of the motor, the speed of the motor can be infinitely adjusted. Soft start energy, power factor compensation and energy saving.

Indirect effect of frequency converter

1. Energy saving (power saving)

The conventional speed regulation method for fans, pumps and other equipment is to adjust the amount of air supply and water supply by adjusting the baffle and valve opening of the inlet or outlet. The input power is large, and a large amount of energy is consumed in the closure process of baffles and valves. in. When using variable frequency speed regulation, if the flow requirements are reduced, the requirements can be met by reducing the pump or fan speed. Reduce power consumption.

2. To improve the automation of production equipment There are many brands of inverters, such as: Hangzhou Aosheng Electric Co., Ltd. agent DY Series 530 inverter to meet the general needs of customers under the premise of extended design can be flexibly to meet customer personalization Requirements, industry requirements meet the requirements of various complex and high-precision drives, and at the same time provide equipment manufacturing customers with highly integrated integrated solutions.

It is not difficult to see that if a lot of companies consume very large amounts of electricity, it is quite amazing that reasonable use of power saved by frequency converters is achievable.

The frequency converter says, how much do you know me, how powerful I am!