How does the inverter power supply work? Please provide the working principle of the downconversion

The variable frequency power supply is to convert the alternating current in the mains power to AC DC AC and output it as a pure sine wave, and the output frequency and voltage can be adjusted within a certain range. It is different from the variable frequency speed controller used for motor speed regulation, and it is also different from the ordinary AC regulated power supply. An ideal AC power supply is characterized by a stable frequency, stable voltage, zero internal resistance, and a pure sine wave (no distortion) in the voltage waveform.

The variable frequency power supply is very close to the ideal AC power supply, therefore, the advanced developed countries are increasingly using the variable frequency power supply as the standard power supply, in order to provide the best power supply environment for the electrical appliances, and facilitate the objective assessment of the technical performance of the electrical appliances. There are two main types of inverter power supplies: linear amplification and SPWM switching type.

The output capability is changed by changing the voltage regulation.

A 10kHz, 20VP-P triangular wave is generated to the simulation board, and the simulation board generates two positive and negative opposite triangular waves for comparison with the sine wave, and four SPWMs are generated and then sent to the driver board, which is optocoupled and isolated as the driving signal of the full-bridge IGBT. After the IGBT is started by the drive signal, the SPWM generated by the T2 transformer is coupled to the secondary side through T2, and the secondary side is reduced to a sine wave, and then the output is switched between high and low grade by the MC, and the voltage and current are fed back at the output terminal at the same time to achieve output voltage stabilization and voltage, current, and watt meter display.

Generally speaking, the variable frequency power supply is a frequency conversion device composed of "AC DC AC filtering" circuit, which can convert AC is the mains, adjust a certain range of frequency and voltage, simulate the power grid indicators of different outputs, and provide pure and reliable, low harmonic distortion, high stability of voltage and frequency of sine wave power output.

1. The working principle of high-voltage inverter: high-voltage inverter is a kind of series superposition high-voltage inverter, that is, multiple single-phase three-level inverters are connected in series to output high-voltage alternating current with variable frequency and variable voltage. According to the basic principle of electrical engineering, the rotational speed of the motor satisfies the following relation:

n = (1 a s)60f p = n. (1-s) (p: number of pole pairs of the motor; f：

motor operating frequency; s: slip) from the equation, the synchronous speed of the motor n.

2. The running frequency (n) that is proportional to the grinding of the motor wheel (n. =60FP), because the slip S is generally small (0-0 05), the actual speed n of the motor is about equal to the synchronous dry bucket speed n of the motor. Therefore, the wax bucket adjusts the power supply frequency f of the motor, and the actual speed of the motor can be changed.

The slip S of the motor is related to the load, and the larger the load, the slip increases, so the actual speed of the motor will decrease slightly with the increase of load.

1. The working principle of the inverter is to control the main circuit through the control circuit, the rectifier in the main circuit converts the alternating current into direct current, the intermediate circuit of the direct current smoothly filters the direct current, and finally the inverter converts the direct current into the alternating current of the required frequency and voltage.

2. In the DC voltage after rectifier rectification, there is a pulsating voltage of 6 times the frequency of the power supply, and the pulsating current generated by the inverter also changes the DC voltage. Some inverters also add components such as CPUs to the circuit to perform the necessary torque calculations.

3. The use of inverter is mainly to adjust the power of the motor and realize the variable speed operation of the motor. The composition of the inverter mainly includes two parts: the control circuit and the main circuit, of which the main circuit also includes rectifiers and inverters and other components.

The master explained and demonstrated: the working principle of the inverter!

In general, a device that converts alternating current with a fixed voltage and frequency into alternating current with variable voltage or frequency is called an inverter. The device first converts three-phase or single-phase alternating current to direct current (DC). Direct current (DC) is then converted to three-phase or single-phase alternating current (AC).

The inverter changes the output frequency and voltage at the same time, that is, changes the n0 on the motor running curve, so that the motor running curve moves down in parallel. Therefore, the inverter can make the motor obtain a larger starting torque with a smaller starting current, that is, the inverter can start the heavy load.

The inverter has basic functions such as voltage regulation, frequency regulation, voltage stabilization, speed regulation, etc., and applies modern science and technology, which is expensive but has good performance, complex internal structure but simple to use, so it is not only used to start the motor, but is widely used in various fields, all kinds of power, all kinds of shapes, all kinds of volumes, all kinds of uses, etc. With the development of technology and the reduction of costs, inverters will be more widely used.

The inverter has digital input and output ports and analog input and output ports, which can be connected according to your needs; The terminals are defined inside the inverter.

Inverter is a power control equipment that applies frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the working power supply of the motor. The inverter is mainly composed of rectifier (AC to DC), filtering, inverter (DC to AC), braking unit, drive unit, detection unit, microprocessor unit, etc. The inverter changes the voltage by changing the frequency of the power supply, which is mainly based on microelectronics and frequency conversion technology.

It is capable of overload, overcurrent, and overvoltage protection.

The inverter is to use the on-off effect of power semiconductor devices to turn the alternating current with fixed voltage and frequency into an alternating current power supply with adjustable voltage and frequency.

The inverter used now mainly adopts the AC-DC-AC mode (VVVF frequency conversion or vector control frequency conversion), which first converts the power frequency AC power supply into DC power supply through the rectifier, and then converts the DC power supply into AC power supply that can be controlled by frequency and voltage to supply the motor.

The inverter is mainly composed of rectification (AC to DC), filtering, re-rectification (DC to AC), braking unit, drive unit, detection unit, microprocessor unit, etc. Danfoss, an international inverter giant, was the first to launch a direct-controlled low-harmonic inverter.

RST is connected to three-phase power supply! UVW connected to the motor!

The working principle is to turn the three-phase or single-phase AC power supply into direct current through the rectifier circuit, and then turn it into alternating current that can change the frequency and voltage according to the needs through the inverter circuit and output it to the motor! As for how it reverses DC into AC, it seems that there is no need to know! If you just want to apply it, learn how to set it up!

Let's read the manual

The 50Hz alternating current is rectified into direct current, and then the direct current is controlled into alternating current at the required frequency. Wiring and adjustment should be based on the inverter manual and control requirements.