The basic composition of the inverter, which components are the main components of the inverter

The inverter is usually divided into 4 parts: the rectifier unit, the high-capacity capacitor, the inverter and the controller.

Rectifier unit: converts alternating current with a fixed operating frequency into direct current.

High Capacitance: Stores converted electrical energy.

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

Controller: Work according to the set program, control the amplitude and pulse width of the output square wave, make the alternating current superimposed as an approximate sine wave, and drive the AC motor.

The following aspects need to be considered when purchasing an inverter:

Applicable load types: Different loads require different inverter types, for example, single-phase motors need single-phase inverters, and three-phase motors require three-phase inverters.

Applicable load power: You need to choose the appropriate inverter according to the power of the load, and the power range of the general inverter will be marked in the product manual.

Frequency range: The frequency range of the inverter needs to take into account the use needs of the load, for example, some motors need a higher frequency range to work properly.

Control mode: Choose the appropriate control mode according to the actual control requirements, such as analog signal control, digital signal control, PLC control, etc.

Brand and quality: Choose well-known brands and products with reliable quality, which can guarantee the use effect and service life.

Other functions: Some inverters also have other functions, such as overload protection, overtemperature protection, insulation protection, PID control, etc., which can be selected according to actual needs.

When purchasing inverters, you need to consider the above factors according to the actual use needs and choose the right products.

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 relies on the interruption of the internal IGBT to adjust the voltage and frequency of the output power supply, and provides the required power supply voltage according to the actual needs of the motor, so as to achieve the purpose of energy saving and speed regulation. With the continuous improvement of industrial automation, frequency converters have also been widely used.

The role of each part:

1. Rectifier, which is connected to a single-phase or three-phase AC power supply to generate a pulsating DC voltage.

2. The intermediate circuit has the following three functions: aStabilize or smooth the pulsating DC voltage for use by the inverter.

b.Power is supplied to the individual control lines via a switching power supply. c.

Filtering or braking devices can be configured to improve drive performance.

3. The inverter converts the fixed DC voltage into the AC voltage with variable voltage and frequency.

4. The control circuit, which transmits the signal to the rectifier, intermediate circuit and inverter, and at the same time it also receives the signal from these parts. Its main components are: output drive circuit, operation control circuit.

The main features are: aA semiconductor device that uses signals to switch on and off an inverter. b.Various control signals are provided to operate the inverter. c.Monitor the working status of the inverter and provide protection functions.

The composition of the inverter is mainly divided into the main circuit and the control circuit, in which the main circuit can be divided into rectifier circuit, filter circuit and inverter circuit. The control circuit is composed of control and feedback.

There are many components of the inverter, resistors, capacitors, diodes, transistors, modules, various ICs and so on.

1. Rectifier.

It is connected to a single-phase or three-phase AC power supply to produce a pulsating DC voltage.

2. Qi stove wide intermediate circuit.

It can stabilize or smooth the pulsating DC voltage for use by the inverter. The individual control lines are supplied with a switching power supply, and filtering or braking devices can also be configured to improve the performance of the inverter.

3. Inverter.

Converts a fixed DC voltage into an AC voltage with variable voltage and frequency.

4. Main circuit.

The power conversion of the voltage and frequency regulation power supply for the asynchronous motor can be divided into two types: voltage type and current type, the voltage type is the inverter that converts the DC of the voltage source into AC, and the filter of the DC loop is the capacitor. The current type is an inverter that converts the DC of the current source into AC, and its DC loop filter is an inductor.

5. Control circuit.

The main circuit that supplies power to the asynchronous motor provides control signals, which is composed of the "operation circuit" of frequency and voltage, the "voltage and current highlight detection circuit" of the main circuit, the "speed detection circuit" of the motor, the "driving circuit" that amplifies the control signal of the operation circuit, and the "protection circuit" of the inverter and the motor.

There are four parts: main circuit, rectifier, flat wave circuit and inverter.

1. Main circuit.

The main circuit is the power conversion part that provides voltage regulation and frequency regulation power supply for the asynchronous number motor, and the main circuit of the inverter can be roughly divided into two categories: the voltage type is the inverter that converts the DC of the voltage source into AC, and the filter of the DC loop is capacitor.

2. Rectifier.

A large number of diode converters are used, which convert the power frequency power supply into DC power supply. It is also possible to form a reversible converter with two sets of transistor converters, which can be regenerated due to the reversible power direction.

3. Flat wave circuit.

The rectified DC voltage of the rectifier contains a pulsating voltage that is 6 times the frequency of the power supply, and the pulsating current generated by the inverter also causes the DC voltage to fluctuate. In order to suppress voltage fluctuations, inductors and capacitors are used to absorb pulsating voltages (currents). If the capacity of the device is small, if there is a margin between the power supply and the main circuit components, a simple flat-wave circuit can be used without inductance.

4. Inverter.

Contrary to the rectifier, the inverter converts the DC power into the AC power of the required frequency, and turns on and off the 6 switching devices at a determined time to obtain a 3-phase AC output. The switching time and voltage waveform are shown in the case of a voltage PWM inverse head transformer.

A frequency converter usually consists of the following parts:

Rectifier: Converts alternating current into direct current.

Filter: Filters the direct current to reduce the fluctuating voltage and current of the output.

Inverter: Converts direct current into high-frequency alternating current.

Control circuit: control the output frequency, voltage and other parameters of the inverter to realize the speed control of the motor.

Radiator: Heat dissipates heat generated inside the inverter.

Display screen: It is used to display the operating status of the inverter, parameter setting, bridge touching and other information.

A frequency converter is actually an inverter. It starts by changing alternating current to direct current. The direct current is then switched on and off with electronic components.

It becomes alternating current. In general, thyristors are used for inverters with large power. And set up a device with adjustable frequency.

Make the frequency adjustable within a certain range. It is used to control the number of revolutions of the motor. The number of revolutions is adjustable within a certain range.

Inverters are widely used in the speed regulation of AC motors. With the development of power electronics technology, AC frequency conversion technology has gradually matured from theory to practice. The inverter not only has smooth speed regulation, large range, high efficiency, small starting current, stable operation, but also has obvious energy-saving effect.

Therefore, AC variable frequency speed regulation has gradually replaced the traditional slip speed regulation, pole change speed regulation, DC speed regulation and other speed regulation systems in the past, and is more and more widely used in metallurgy, textile, printing and dyeing, smoke machine production line and buildings, water supply and other fields. Generally, it is divided into several parts, such as rectifier circuit, flat wave circuit, control circuit, and inverter circuit.

1.Rectifier circuits.

The function of the rectifier circuit is to convert the AC power supply into DC power. The rectifier circuit is generally a single rectifier module.

2.Flat-wave circuits.

In order to suppress voltage fluctuations, inductors and capacitors are used to absorb the pulsating voltage (current), and the DC part of the general inverter power supply has a margin for the main circuit, so a simple capacitor filtering flat wave circuit is used to omit the inductance and the inductance is used.

3.Control circuits.

At present, the frequency conversion governor basically uses 16-bit, 32-bit single-chip microcomputer or DSP as the control core, so as to achieve full digital control.

The inverter is a speed regulating device with adjustable output voltage and frequency. The circuit that provides the control signal is called the main control circuit, and the control circuit consists of the following circuits: the "operation circuit" for frequency and voltage, the "voltage and current detection circuit" for the main circuit, and the "speed detection circuit" for the motor.

The control signals of the arithmetic circuits are sent to the "drive circuits" and the "protection circuits" of the inverters and motors.

The control mode adopted by the inverter, i.e., speed control, rejection control, PID or other methods.

4. Inverter circuit.

The inverter circuit is the opposite of the rectifier circuit, the inverter circuit converts the DC voltage into the AC voltage of the desired frequency, and turns on and off the power switching devices on and off the upper and lower sides at a determined time. Thus, the three-phase AC voltage with a phase difference of 120° electrical angle can be obtained on the output U, V, and W phases.

Briefly describe the basic working principle of the inverter

Frequency converters. Principle: Oak Zhao is an electric energy control device that uses the on-off effect of power semiconductor devices to convert the power supply of power frequency into another frequency. It can be divided into AC-AC inverter, AC-DC-AC inverter.

Jiaoliang Qing rent - AC inverter can directly turn alternating current into alternating current with variable frequency and voltage; The AC-DC-AC inverter first rectifies the alternating current into direct current through the rectifier, and then turns the DC current into alternating current with variable frequency and voltage through the inverter.

The main components of the inverter are: rectifier module, inverter module, capacitor, driver board, motherboard, and shell! (Shaanxi inverter sales: 137 720 98637 Zhang Qi).

To put it simply, the inverter is mainly composed of rectifier (AC to DC), filtering, inverter (DC to AC), braking unit, drive unit, detection unit, microprocessing unit, etc.

Main circuit part: rectifier, flat wave circuit, inverter.

Control special circuit part: operation circuit, detection and test circuit. Drive circuits, protect circuits.

Power components. Frequency transformer is generally an electrical energy control device that uses the on-off effect of power semiconductor devices to convert the power supply of power frequency to another frequency. The main circuit of the inverter can be roughly divided into two categories: the voltage type is the inverter that converts the DC of the voltage source into AC, and the filter of the DC loop is capacitor; The current type is an inverter that converts the DC of the current source into AC, and its DC loop filter is an inductor.

1 Main circuit, including rectifier, flat wave circuit, inverter.

2. Control circuits, including operation circuits and detection circuits. Drive circuits, protect circuits.

3 power components.

The inverter is mainly composed of three parts.

1 Switching power supply.

2. Main circuit power board (rectification, inverter and filtering).

3 Control board (software, IGBT trigger pulse).