Cyclo-Converter  based speed control of three-phase induction motor drive

FPGA based PWM Controller

 This PWM controller is designed based on SPARTAN-6 FPGA controller chip and  this controller can be used  to generate  PWM Signals for SCR, IGBT based power electronics application like DC-AC Inverter ,DC-DC Chopper & SCR  converter based AC/DC/BLDC Switched Reluctance Motor (SRM) control application. PWM output of this controller can be interfaced with Power Module through External cable connection.

FPGA Features

• FPGA Device :           XC6SLX9 (Spartan-6 XC6SLX9 in TQG144 package)

• Number Of Clock Sources :           1
• Primary Clock Frequency :           100MHz (100MHz CMOS oscillator)
• Number Of GPIOs (Max) :           70
• Configuration Options :           USB 2.0 interface for On-board flash programming, JTAG

• Configuration Memory :           Flash memory-16 Mb SPI flash memory (M25P16)

• Power supply :           On-board voltage regulators for single power rail operation

Keys & Displays

• 20 X4 LCD Display is provided to indicate control parameters
• 2 numbers of PWM/Pulse INC-DEC Keys are provided
• 4 numbers of Toggle switches is provided

PWM Outputs & Digital I/O’S

• 6 numbers of PWM output @ 5V logic level ( 3.3v to 5V level converter is provided)
• 21 numbers of digital I/O’s @ 3.3V logic level is terminated at separate connector
• 18 numbers of digital I/O’s @ 3.3V logic level is terminated at separate connector
• 3 numbers of Digital input @ 5V logic level is provided for speed sensor interface / Motor feedback (hall sensor) interface

ADC/DAC

• 4 Channel I2C based ADC ( 8 BIT)
• 1 Channel DAC ( 8 BIT)

LEDS

• 4 numbers of LED is provided for toggle switch status indication
• 3 numbers of LED is provided for feedback input- status indication
• 3 numbers of LED is provided power supply status indication

Power supply

• 5VDC@1A dc regulated power supply is provided for controller input
• 5V to 3.3V converter is provided for FPGA Controller
• FPGA board is mounted on nice powder coated cabinet.
• 230VAC Input with power ON/OFF Switch

Features

• SCR Firing pulse generation with Firing angle adjustment of 180-0 degree & Frequency selection of 50Hz , 50/2 Hz , 50/3Hz , 50/4 Hz, 50/5Hz & 50/6 Hz
• Digital Keys are provided to select Output Frequency & Firing angle adjustment

SCR Power Module-3 Phase Mid Point Type

• 12 number of SCRs (1200V @ 25Amp) With necessary Heat sink & Snubber circuit is provided to Form 3 phase Mid-Point Type Cyclo-converter power Circuit.
• Pulse transformer & Transistor based Pulse amplifier is provided in all Four SCR’s
• IC based ZCD Circuit is provided for Synchronized SCR Pulse generation
• Input 230V + 10%, 50Hz single phase AC & + 15V DC @ 0.5A regulated output for the trigger circuits.
• Output : 3Ø, 415V, 5A, 1 KW

3Ø AC Motor set up with speed feedback sensor

This 3 phase squirrel cage induction motor used as load for 3 phases Inverter set up for open loop & closed loop control applications. Specifications are

• Type :           3Ø Squirrel Cage Induction Motor
• Power :           1hp
• Voltage :           415/200V
• Speed :           1415rpm
• Make :           Siemens /CG/KEC
• Feedback sensor :           Proximity sensor
• Loading arrangement :           Spring balance type loading arrangement with dial indication

Accessories

• 3 number of Center tape transformer of 230 /240-0-240VAC@ 3kva is provided for power circuit input
• IGR
• 3 Phase Variac -15A is provided