Design of an FPGA-Based SPWM
Digital Control IC for AC
Induction Motor Drives
Ming-Fa Tsai Fu-Ching Ke Yu-Hsien Chung Tsung-Hua Yang Huan-Wen Chen Ju-Chi Ni
Department of Electrical Engineering, Minghsin University of Science and Technology
指導教授:龔應時
研究生:曾琮峻
學號:MA320107
Outline
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Abstract
Introduction
AC induction motor D-Q model construction
The architecture and Design of the SPWM digital
control IC
The Co-simulation environment of Simulink、
ModelSim and PSIM
Hardware implementation and experimental results
Conclusion
Abstract
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This paper presents the design of an FPGA-based SPWM digital control IC, which
is intended for controlling the rotational speed of a three-phase ac induction motor
via a three-phase inverter. The architecture of the control IC consists of four major
parts: a triangular wave to produce a counter, a three-phase sine-wave look-up table
to produce a reference command, a comparator, and a switch dead-time generator.
All the four parts have been designed by using VHDL language.
The D-Q model of an AC induction motor has also been constructed for verification
of the designed SPWM digital control IC in the Simulink, ModelSim, and PSIM
cosimulation environment. The designed control IC circuit has been implemented
on an Altera Flex 10K FPGA logic device. Simulation and experimental results are
shown to verify the viability of the proposed control IC properly.
Introduction
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In recent years, due to the development of microelectronics technology, use
of digital CMOS process technology system, FPGA and CPLD
programmable logic elements have appeared.
Because of the short design cycle, high-density and programmable, users
have attracted widespread attention .
Purpose of this paper, using FPGA components, design a SPWM driving
control IC. to control an AC induction motor, such that at different
frequencies of the command to obtain different speed response.
AC induction motor D-Q model
construction
A three-phase AC squirrel cage induction motor, the stator and rotor voltage equations.
Stator and rotor flux equations.
The (5) - (8) into (1) - (4) can be
The 𝑖𝑑𝑠 , 𝑖𝑞𝑠 , 𝑖𝑑𝑟 , 𝑖𝑞𝑟 is the AC induction motor dynamic equation of the four variables, to
mix (9) - (12), can be.
Torque equation
Mechanical dynamic equation
Three-phase Voltage of motor with stationary reference frame
Voltage relation of three-phase input and the center of the motor
V𝑎𝑛 + V𝑏𝑛 + V𝑐𝑛 = 0 , into (17)-(18) can be
Let (20) into (17)-(19) can be
Three-phase current of motor with stationary reference frame
Dynamic model block diagram of an AC induction motor
In Matlab / Simulink simulation
Frequency of 10Hz (a) the three-phase voltage command waveform (b) waveform diagram
of the speed response (c) waveform diagram of the current response
The architecture and Design of the
SPWM digital control IC
The three-phase sine wave command with a triangular counter comparison, generate a
pulse width modulated signal, then generator with an optocoupler isolation circuit via a
deadlock time, triggering power crystals ON, OFF
Digital SPWM control IC block diagram
The simulation results
The simulation results
The Co-simulation environment of
Simulink、ModelSim and PSIM
Figure 13, Analog frequency at 10Hz
(a) The three-phase voltage command
(b) the Speed response
(c) the current response
Figure 13, Analog frequency at 20Hz
(a) The three-phase voltage command
(b) the Speed response
(c) the current response
analog frequency in (a) 10Hz (b) 20Hz, the output signal waveform
diagram of SPWM
Hardware implementation and
experimental results
Download it to the Altera Flex 10K100ARC240-1 of execution element FPGA,
control the speed of an AC induction motor, the power transistors used for
MOSFET-STMicroelectronics GROUP IRFP450 (voltage 500V, resistance to flow 14A)
PWM control trigger signal (a) 10 Hz (b) 20Hz Experimental waveforms
SPWM control IC drive current in response to (a) 10Hz (b) 20Hz
Experimental waveforms (1A / 100mV)
Conclusion
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The FPGA-based digital SPWM AC induction motor control IC‘s designed to drive AC
induction motor, In the digital control circuit part of its internal architecture consists of a
triangular wave generator counter, a three-phase sinusoidal command produces check value
table, the three-phase sinusoidal command after comparison with the triangular wave
generated trigger signal via a three-phase PWM comparator, Reuse a deadlock SPWM switch
conduction time controller delay 1 s ~ 6 s six power switch control signal.
Proof of AC induction motor speed will also rise in the frequency increases, and the current is
decreased; opposing torque is also decreased, and vice versa, the four parts of the circuit
design is VHDL to achieve, And after the establishment of a dynamic model of the AC
induction motor simulation to verify the joint simulation environment Simulink, ModelSim,
and PSIM, and finally downloaded to an Altera Flex 10K FPGA logic elements experiment.
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Thank you for your attention.