Notes on Power Electronics - Renewable and Power Electronics Laboratory | ECEN 4517, Study notes of Electrical and Electronics Engineering

Download Notes on Power Electronics - Renewable and Power Electronics Laboratory | ECEN 4517 and more Study notes Electrical and Electronics Engineering in PDF only on Docsity! ECEN 4517 1 Lecture 5 ECEN 4517/5517 Buck converter Peak power tracker Battery charging ECEN 4517 2 Goals in upcoming weeks This week (Exp. 3, week 2): Finish Exp.3 part 1 with buck converter operating outside with PV panel Start Exp.3 part 2: digital control with the MSP430 microcontroller Next week (Exp. 3, week 3): Demonstrate peak power tracker algorithms outside with converter connected between the PV panel and battery Following week (Exp. 4, week 1): Finish Exp. 3 if not complete Start inverter experiment TI MSP430 Microcontroller MSP430x16x XIN XOUT Divcc DVss 9 AVoc «AN STINMI P2 Pa P4 PSPS —_— —~——-—— LL —p,——___ —— r 7 Rose i Oscillator | ACLK ([6oKB Flash] 2kB RAMP] ADC12 DAcI2 VO Port 12] |10 Port a4 | VO Port 5/6 “ 16 Os, 16 VOs 16 Os xT2IN System > SMCLK | 4akE Flash] | 2KBRAM|| 12-bit 12-Bit with I XT2OUT oc 8 Channels | | 2 Channels Interrupt | 1KB FAM | |<10us Cony] | Voltage out Capability J a mck 8 MHz | | | | Vv MAB, ! | Test MAB, 16-Bit sbi z——||/ | TAG wv | cPu MCB | Incl. 16 Req . r = r ! | Es | | 3B = ES MDB, 16-Bit Bus | 5 [ Bus MDB, 8 Bit I TMS Harchware = | TCK Muttiplier DMA = [7] Watchdog [7] TimerB7 [] TimerAs POR (omparator USARTO USART1 | Controller FAY Timer H SVS A I r MPY, MPYS 7.0C Reg |} 3CC Reg Brownout UART Mode} JUART Mode} TDUTCLK MAGMACS 3Channeis| | 15/16-Bit | | “Shadow SPI Mode | | SPI Mode I TDO/TDI . Reg PC Mode i SS SS I ECEN 4517 5 ECEN 4517 6 Analog-to-Digital Converters • There are eight (multiplexed) A/D channels, labeled A0 through A7 in the pinout diagram. Some of these pins are shared with other functions. • A/D channels A6 and A7 will not be used because their pins are used for D/A outputs instead. • A/D channels A0 and A1 will not be used because the development board hard-wires their pins to the LED and button instead. • A/D channels A2 through A5 are available as usable A/D inputs. • A/D channel A2 is connected to the connector pin labeled P6.2. In the project files, the sampled voltage appears in the variable Adc_data[0]. • A/D channels A3, A4, and A5 are connected to connector pins P6.3, P6.4, and P6.5 respectively. In the project files, the sampled voltages of these pins appear in the variables Adc_Data[1], Adc_Data[2], and Adc_Data[3]. • These inputs convert voltages in the range 0 to 2.5 V. Do not apply voltages exceeding 3.3 V or negative voltages to these pins! ECEN 4517 7 Additional Peripherals Digital-to-analog converter • There are two D/A converter channels: DAC0 and DAC1. • Channel DAC0 is connected to pin P6.6 of the connector. In the project files, the voltage at this pin is controlled by writing to the DAC0 data register DAC12_0DAT. • Channel DAC1 is connected to pin P6.7 of the connector. In the project files, the voltage at this pin is controlled by writing to the DAC1 data register DAC12_1DAT. Timer / PWM • Timer A is used to generate pulse-width modulated waveforms. • In the project files, Timer A output TA1 is used to output a PWM waveform which appears on pin P1.6. The duty cycle of this waveform is controlled by writing to the global variable D0. • In the project files, Timer A output TA2 is used to output a PWM waveform which appears on pin P1.7. The duty cycle of this waveform is controlled by writing to the global variable D1. LED and button • There is a small LED on the development board, which is connected to pin P6.0. The LED can be controlled by writing to bit 0 of peripheral 6. • The pushbutton on the development board is connected to pin P6.1. The state of the pushbutton can be read in a similar manner. ECEN 4517 10 Configuring the I/O Ports • Setup in systemInit, main.c • Configure input/output, e.g. // Port6: // P6.0: LED output // P6.2-6.5: ADC2-ADC5 inputs // P6.6-6.7: DAC0 and DAC1 outputs P6SEL = BIT2 + BIT3 + BIT4 + BIT5 + BIT6 + BIT7; P6DIR = BIT0 + BIT6 + BIT7; ECEN 4517 11 Tutorials Tutorial 1: LED • Getting started with the programming environment (IAR) • Hardware setup, Make/Run code, debugging steps and breakpoints, blink an LED Tutorial 2: PWM controller • Modify the project software files to realize a digital PWM • Utilize ADC, DAC and Timer/PWM peripherals ECEN 4517 12 Exp. 3, Part 2: Digital PWM + V – Power stage board IR2111 driver C1 L1 C2+–Vg 680 µF 25 VDC D1 MBR745 iD iL 2200 µF 35 VDC Q1 NTP18N06 iT + vD – 1kΩ 1/4W 0-35 V iC1 + + +12 V supply + TC427 driver Control breadboard Microcontroller MSP 430 D0 GND Microcontroller eval board Twisted pair +3.3V A2