Description
hardware flow control. It is an ideal choice in the field of industrial automation.
2. Principle of frequency converter
In embedded development, the control of motors is often involved. Currently, frequency conversion control of AC motors is widely used, so let”s briefly introduce the
frequency converter by looking at the diagram, assuming that you already understand the principle of the motor.
The block diagram is as follows:
The frequency converter is mainly composed of rectifier (AC to DC), filtering, inverter (DC to AC), braking unit, drive unit, detection unit, microprocessing unit, etc.
The inverter relies on the switching 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, thereby achieving the purpose of energy saving and speed regulation. In addition, the inverter also has many protection functions.
, such as overcurrent, overvoltage, overload protection, etc. With the continuous improvement of industrial automation, frequency converters have also been widely used.
A typical inverter system diagram is shown below. It mainly includes operation panel, VFD controller, motor and other parts.
1. Typical structure:
Mainly includes: control platform, measurement circuit, power circuit, protection circuit, etc.
There are two common types of frequency converters: voltage type and current type. Among them, the power inverter part mostly uses power
tubes such as IGBT and IGCT.
2. Typical algorithm:
Among them, the control algorithm represented by Siemens is mainly based on coordinate transformation (vector control). Friends who are
interested in the algorithm represented by ABB can search for information by themselves (direct torque control) and will not go into details here.
3. Vector control:
Many chip MCU and MPU manufacturers have provided block diagrams and algorithm libraries for variable frequency vector control. Those
who are interested can study it. For example, the following figure is a block diagram provided by Microchip
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DS3800NHVD1C1B printed circuit board
DS3800NHVD1D1 printed circuit board
DS3800NHVD1E1B printed circuit board
DS3800NHVD1E1E printed circuit board
UFC760BE142 3BHE004573R0142 ABB Controller master unit
UFC760BE42 3BHE004573R0042 ABB System spare parts
UFC760BE43 3BHE004573R0043 System spare parts
DS3800NHVE printed circuit board
UFC911B106 3BHE037864R0106 System board card
UFC911B108 ABB Control module card key
UFC911B110 ABB Input control panel
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C3K122-24P ENTERASYS Controller module
C3K122-24 ENTERASYS Control of signal
C3G124-48 ENTERASYS Processor module
C3G124-24 ENTERASYS Processor module
ENTERASYS C3G124-24P Network interface module
08G20G4-48P 800-Series Layer 2 switch
08G20G4-48 800-Series Layer 2 switch
08G20G4-24P 800-Series Layer 2 switch
08G20G2-08P 800-Series Layer 2 switch
ENTERASYS 08H20G4-48 800-Series Layer 2 switch
08G20G2-08 800-Series Layer 2 switch ENTERASYS
08H20G4-48P 800-Series 10/100 Switches ENTERASYS
08H20G4-24P ENTERASYS switch
08H20G4-24 ENTERASYS 24 port 10/100 800-Series Layer 2 switch
B5K125-48 and B5K125-48P2 ENTERASYS gateway
B5K125-24 and B5K125-24P2 ENTERASYS Switch
B5G124-24 and B5G124-24P2 Ethernet Switch
ENTERASYS B5G124-24 Ethernet Switch
I3H252-8TX-2FX ENTERASYS High-end Secure Networks
I3H252-8FXM ENTERASYS
I3H252-6TX-MEM ENTERASYS Ethernet
ENTERASYS I3H252-4FX-MEM Ethernet L2 Switch
switch I3H252-4FXM ENTERASYS
I3H252-12TX ENTERASYS Ethernet switch
Switch A2H254-16 ENTERASYS
A2H124-24FX Switch ENTERASYS
ENTERASYS A2H124-48P Switch Ports
A2H124-48 Switch Ports ENTERASYS
A2H124-24P ENTERASYS Switch Ports
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