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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DS200DSPCH1ADA DCS system module
DS200DSPAG1AAB Digital output board
DS200DMCAG1AHC Analog quantity module
DS200DMCAG1AGB DCS card module
DS200DENQF1BDE analog module
DS200DENQF1BDE Serial port measuring board
DS200DENQF1B inverter communication card
Medium voltage circuit board DS200DENCF1BDE02
DS200DENCF1BDE01 Control system module
SDCS-FEX-2A ABB Excitation plate
DS200DDTBG2ABB I/O terminal board
SCA640-74GM BASLER Industrial camera
DS200DCVAG2A Dc power supply and instrument panel
DS200DCPAG1A Output module
DS200DCFBG2B DC feedback board
DS200DCFBG1BUN Turbine control
DS200DCFBG1BNC medium voltage circuit board
DS200DCFBG1BLC Medium voltage circuit board
DS200DCFBG1BKC digital input module
DS200DACAG1A Converter board
DS200CVMAG3A monitor
DS200CVMAG1A turbine control panel
DS200CTBDG1A Programmable controller
DS200CTBAG1A processor terminal board
DS200CSSAG1B sensor board
DS200CSSAG1A printed circuit board
DS200CPCAG1A Analog output module
DS200CLACG1A CPU controller
DS200CDBAG1B Servo drive driver
PN-43652 A-B Main control panel kit
DS200ADPAG1A DCS spare parts
DS200CDBAG1A Control system I/O module
DS200ADCIH1A Control module
DS200ACNAG1A Analog input module
DS200AAHAH2A System card piece
DS200AAHAH1A DCS module
DS200AAHAG1ADC Processor module
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