Texas Instruments DRV830x Rev D. Manuale utente

DRV830x Rev D. Hardware Quick Start Guide

Version 1.0.5 Motor Solutions

Fig 1: DRV830x EVM with controlCARD

Abstract

The Low Voltage, High Current Motor Drive EVM (DRV8301, Figure 1), provides a great way to

learn and experiment with digital control of sub 60 volt three-phase motors to increase efficiency

of operation. The board is available in two configurations, the DRV8301 or the DRV8302. This

document goes over the typical kit contents and hardware details, and explains the functions and

locations of jumpers and connectors present on the board. This document supersedes all the

documents available for the kit.

Version: 1.0.5

Revision History:

1.0.5 April 23, 2014 Fixed page 18-20 comments regarding ADC

and IQ CURRENT, VOLTAGE, and pole settings

1.04 January 29, 2014 Changed page 8 regarding GPIO to Enable Pin

connection with TMDSCNCD28027F

1.03 July 11, 2013 Updated for TMDSCNCD28027F support. See

specific instructions on Page 8.

Added section on Optimizing Sense Circuitry

1.0.2 March 21, 2013 Added Revision History

1.0.1 February 26,

2013 First release

WARNING

This EVM is meant to be operated in a lab environment only and is not

considered by TI to be a finished end-product fit for general consumer use

This EVM must be used only by qualified engineers and technicians familiar

with risks associated with handling high voltage electrical and

mechanical components, systems and subsystems.

This equipment operates at voltages and currents that can result in electrical shock, fire

hazard and/or personal injury if not properly handled or applied. Equipment must be used

with necessary caution and appropriate safeguards employed to avoid personal injury or

property damage.

It is the user’s responsibility to confirm that the voltages and isolation requirements are

identified and understood, prior to energizing the board and or simulation. When

energized, the EVM or components connected to the EVM should not be touched.

Table of Contents

Getting Familiar with the Kit .......................................................................................................... 5

Kit Contents ..............................................................................................................................................................................5

Board Features:........................................................................................................................................................................5

Warning: about low switching frequencies on the DRV830x ....................................................................................................5

Hardware Overview ........................................................................................................................ 6

Macro Blocks ............................................................................................................................................................................6

Powering the Board......................................................................................................................... 8

Hardware Resource Mapping.......................................................................................................... 9

Resource Allocation..................................................................................................................................................................9

Jumpers and Connectors........................................................................................................................................................11

Optimizing Sense Circuitry........................................................................................................... 16

Overview.................................................................................................................................................................................16

Shunt Current Feedback.........................................................................................................................................................17

Phase Voltage Feedback........................................................................................................................................................18

Phase Voltage Filter Feedback...............................................................................................................................................20

SCHEMATIC DISCLAIMER AND WARNINGS ...................................................................... 22

Getting Familiar with the Kit

Kit Contents

The DRV830x EVM is usually available packaged as a full solution kit:

•MCU controlCARD

•DRV830x EVM board with slot for the controlCARD

•USB Cable

•USB/DVD with CCStudio IDE, GUI, documentation, and link to project software

distribution

•Some versions ship with a tabletop 24V 2.5A power supply and 24V Motor with built-in

Hall Sensors and Encoder

The DRV830x EVM board can accept many of the TI MCU controlCARDs, but we recommend

using the versions that ship with the kits that include the JTAG emulator, USB to serial, and

isolation on the controlCARD. It is recommended to always check for any updates to the GUI

executable and MCU program.

Board Features:

The board has the following features

•Three-Phase Power Stage, DRV830x capable of driving 3-phase brushless DC motors

and Permanent Magnet Synchronous Motors.

o60V DC max input voltage

o60A peak output current per phase

oUp to 200khz driver switching frequency

oIntegrated 1A buck converter to provide logic and analog power

oDual integrated current sense amplifiers

•Isolated CAN and SPI communication (will only work if MCU supports and SW is

enabled)

•JTAG connector for external emulators

•Quadrature Encoder Interface and Hall Sensor Interface available for speed and position

measurement (only if MCU supports and SW is enabled)

•High precision low-side current sensing using integrated current sense amplifiers in the

DRV830x (2-ch) or optional external 3-ch (Starting with DRV8301 RevD)

•Over current protection on the inverter stage by DRV830x

•Hardware Developer’s Package that includes schematics and bill of materials

•Closed-loop digital control with feedback using the MCU’s on-chip PWM and ADC

peripherals

Warning: about low switching frequencies on the DRV830x

When the DRV830x runs at a low switching frequency (e.g. less than 20 kHz with 100 nF

bootstrap capacitor), the bootstrap capacitor voltage might not be able to maintain a proper

voltage level for the high-side gate driver. A bootstrap capacitor under voltage protection circuit

(BST_UVP) will start under this circumstance to prevent the potential failure of the high-side

MOSFET. In this circumstance, both the FAULT and OTW pins should pull low and the device

should self-protect itself. The motor’s inductance and the inverter’s bootstrap capacitance will

allow the DRV830x to run efficiently until approximately 10 kHz (with margin). Setting the PWM

switching frequency below 10 kHz may cause issues on the inverter output and is not

recommended. Please reference the datasheet.

Hardware Overview

The example projects made available with the kit may be done with a supplied 24V power supply,

but many of the examples will work with an externally supplied laboratory power supply of a

different voltage or current limit. The DRV830x EVM has all the power and control blocks that

constitute a typical motor drive system for a three-phase system: Communications + Control +

Feedback + Feedforward + Drive

Macro Blocks

The motor control board is separated into functional groups that enable a complete motor drive

system, these are referred to as macro blocks. Following is a list of the macro blocks present on

the board and their functions:

•controlCARD socket – Socket for a controlCARD (preferably using built-in emulation).

•DC Bus Connection

o“PVDD/GND” Terminals – Connect an external 8-60V DC lab supply here

making sure to observe correct polarity..

•DRV830x – This module includes either the DRV8301 or DRV8302 Three Phase Pre-

Driver as well as all of the necessary external passive components.

•Current Sense – Low-side shunt current sensing on each half-bridge.

•Quadrature Encoder Connections – Connections are available for an optional shaft

encoder to interface to the MCU’s QEP peripheral.

•Hall Effect Sensor Connections – Connections are available for optional Hall Effect

Sensors.

Fig 2, illustrates the position of these macro blocks on the board. The use of a macro block

approach, for different power stages enables easy debug and testing of one stage at a time. All

the PWM’s and ADC signals which are the actuation and sense signals have designated test

points on the board, which makes it easy for an application developer to try out new algorithms

and strategies.

Fig2: DRV830x-EVM Board Macros

Powering the Board

The board is separated into two power domains*, the low voltage Controller Power domain that

powers the controller and the logic circuit present on the board, and the medium voltage power

delivery line that is used to carry the medium voltage and current like the DC power for the

Inverter also referred to as DC Bus.

1) Controller Power comprises of the 5V and 3.3V that the board uses to power the controller

and the logic and sensing circuit present on the board. This power is regulated from the DC bus

by the DRV830x integrated buck converter.

2) DC Bus Power is the medium voltage line – up to 60V - that provides the voltage to the

inverter stage to generate 3 phases to control the motor

Note: Do not apply power to board before you have verified these settings!

The kit ships with the control card inserted and the jumper and switch settings pre done

for connecting with the GUI. However the user must ensure that these settings are valid

on the board.

1. Make sure nothing is connected to the board, and no power is being supplied to

the board.

2. Insert the controlCARD into the connector if not already populated.

Special Notes Regarding controlCARD Use

•Make sure switches are set properly on the controlCARD according to the

appropriate qsg_hw_cncd280xxx.pdf

•Special notes for using controlCARDs with this motor drive board

oWhen using TMDSCNCD28027F

Connect pin 2 of J12 (GPIO-29) to pin 6 of J5 (EN_GATE).

Note, for all MotorWare versions up to _11 this was pin1 of

J11. Changed in _12 due to pin conflict.

3. Make sure the following jumpers & connector settings are valid i.e.

a. JP2 is installed

4. Connect your PC to the kit

a. controlCARDs with on-card XDS100 USB-JTAG:

i. connect USB cable from computer to USB connector on control

card

b. controlCARDs without on-card USB-JTAG

i. connect USB cable from computer to external emulator, and

emulator to 14-pin JTAG header (J21)

5. Connect the motor you want to spin to the “MOTOR” terminal block as shown

below. The order is not important unless a rotor sensor is used. If ground is

available with your motor it should also be used.

6. Connect an 8-60V DC power supply to the PVDD and GND terminals.

Fig3: DRV830x-HC-EVM Motor Connections

Hardware Resource Mapping

Resource Allocation

Pin no. GPIO Signal Name Function

(DRV8301/DRV8302)

23 GPIO-00 PWM_AH DRV830x Phase AH PWM input

73 GPIO-01 PWM_AL DRV830x Phase AL PWM input

24 GPIO-02 PWM_BL DRV830x Phase BH PWM input

74 GPIO-03 PWM_BL DRV830x Phase BL PWM input

25 GPIO-04 PWM_CH DRV830x Phase CH PWM input

75 GPIO-05 PWM_CL DRV830x Phase CL PWM input

26 GPIO-06 DAC_PWM4 PWM DAC

76 GPIO-07 STOP Push button input

28 GPIO-08 DAC_PWM3 PWM DAC

78 GPIO-09 START Push button input

29 GPIO-10 DAC_PWM1 PWM DAC

79 GPIO-11 DAC_PWM2 PWM DAC

33 GPIO-12 LED-1 User LED

83 GPIO-13 OCTWn Over-temperature warning

84 GPIO-14 FAULTn Over-current fault

34 GPIO-15 LED-2 User LED

38 GPIO-16 SPI-SIMO Isolated SPI Interface

88 GPIO-17 SPI-SOMI Isolated SPI Interface

39 GPIO-18 SPI-CLK Isolated SPI Interface

89 GPIO-19 SPI-STE Isolated SPI Interface

40 GPIO-20 QEPA Encoder A

90 GPIO-21 QEPB Encoder B

41 GPIO-22 STATUS User LED

91 GPIO-23 QEPI Encoder Index

35 GPIO-24 SDI SPI Data In/M_DC

85 GPIO-25 SDO SPI Data Out/GAIN

36 GPIO-26 SCLK SPI ClockDC_ADJ

86 GPIO-27 /SCS /SCS/M_PWM

44 GPIO-30 CAN-RX Isolated CAN Interface

94 GPIO-31 CAN-TX Isolated CAN Interface

30 GPIO-40 CAP1 Hall Input 1

80 GPIO-41 CAP2 Hall Input 2

31 GPIO-42 CAP3 Hall Input 3

81 GPIO-43 DC-CAL Short DC current sense amplifier

inputs to ground, calibrate offset

59 ADC-A1 IA-FB Current sense phase A

61 ADC-A2 I-TOTAL DC Bus current sense

63 ADC-A3 IC-FB Current sense phase C

67 ADC-A5 IC-FB Current sense phase C

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