Speed Control Of Seperately Excited Dc Motor Using Mosfet/Igbt Chopper ( 4 Quadarant Chopper Drive)

Microcontroller based PWM Controller

This PWM controller is designed based on Dspic30f4011 controller chip specially designed for Power Electronics & Motor control applications from “MICROCHIP” company  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 directly interfaced with Power Module through External cable connection.

 Features

• Includes High-Performance Microchip dsPIC30F4011 Microcontroller with 48kb Internal Flash Program Memory
• 6 Numbers of PWM Outputs up to 15KHZ of switching frequency
• RS232 Connection with MAX232
• Internal EEPROM
• Five 16-bit Timers
• Power, Programming and Test LED’s
• 2MB PROM & 24 Mhz clock speed
• USB – PGM Down loader
• 6 Numbers of ADC input
• QEP Sensor /Hall sensor/Speed sensor(Proximity)Interface
• PWM increment & decrement key
• Reset switch & LED’s for Sensor status
• 20 X 4 LCD screen
• PWM outputs are terminated by 34 pin FRC Connector

 USB Based Program downloader

• One number of USB based program downloader is provided
•  IGBT power module (Voltage source Inverter)

 This power module is designed by using IGBT based Smart Power Module (SPM) from “FAIRCHILD SEMICONDUCTORS” for AC/DC Motor control application. This power module can be used for AC, DC, BLDC, PMSM Motor application by proper external PWM controller interfacing (like Dspic , FPGA & DSP). This Module consists of

IGBT

• One Number of SPM-Smart Power Module ( Model FSBB20CH60B ) Rating @ 600V , 20A based Voltage source inverter Power circuit
• SPM-IGBT is fixed with suitable heat sink and snubber circuit for protection
• IGBT Power circuit input and outputs are  terminated by suitable rating banana connectors in front panel with necessary indication

DIODE RECTIFIER

• One number of diode rectifier ( 600V @ 35A ) is provided to converter input AC voltage to DC Bus voltage
• DC Capacitor is provided ( centre point type) at diode rectifier output side for Filter
• Analogue DC Voltmeter is provided to measure DC Bus voltage

PWM ISOLATOR

• Six Number of PWM Isolator IC (6N137) is used to isolate All the six PWM signals input
• One number of +15V@1amp fixed dc power supply is provided for PWM Isolator input side for power excitation
• One number of +5V@1amp fixed dc power supply is provided for PWM Isolator Output side power excitation

PWM Driver

• Built in IGBT Gate Driver is provided in SPM for IGBT Gate signal amplification.

SENSORS

• 3 numbers of Hall effect current sensor @ 25A is provided for 3Ø output AC/DC Current measurement
• 1 numbers of Hall effect current sensor @ 25A is provided for Input DC bus Current measurement
• Op-Amp based Signal conditioner circuits are provided in all sensors for output current signals amplifications
• All current sensor signal conditioner circuit outputs are terminated in front panel by suitable connectors

PROTECTION CIRCUIT

• One number of automatic trip circuit is provided for O/C protection
• LED is provided for trip status indication
• Reset switch is provided for TRIP RESET

CONNECTORS

• One number of 34 pin FRC Connector is provided for PWM input signal input and feed back
• Banana connectors are provided for AC input
• Banana connectors are provided for 3 phase output
• Test points are provided for PWM signal and Current wave form measurements
• MCB is provided at input side for Input supply ON/OFF

 SPECIFICATION

• Power Circuit
• Input             :           0-230VAC , 50 HZ (or) 0-300VDC
• Output                                     :           3 Ø 200V @ 5A , Variable Voltage ,

Variable frequency ( OR) 0 +/- 280VDC

• PWM Section
• Number of PWM Input             :           6
• Maximum PWM Frequency :           15KHZ
• PWM Level             :           0-5V (TTL)

DC Shunt  Motor with load set up

• Type             :           DC Shunt Motor
• Power :           1 hp
• Voltage             :           200vdc for Armature & Field
• Speed                                                 :           1500 RPM
• Feedback sensor             :           Proximity sensor
• Loading             :           spring balance loading
• Make             :           BENN /RAMSON/OMEGA

 Spring balance Loading

• One number Brake DRUM with spring balance set up is coupled with the above motor
• Two numbers of dial indication for Load in Kg measurement All are mounted on a powder coated mechanical set up.