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  • 双色球:TI DRV8312和Stellaris MCU三相BLDC马达驱动方案

    发布时间:2012年04月01日 14:04    发布者:1770309616
    关键词: DRV8312 , MCU , Stellaris , TI , 马达驱动
    TI公司的三相BLDC马达驱动套件DK-LM3S-DRV8312采用DRV8312三相马达驱动器和Stellaris MCU,是中电压数字马达控制(DMC)套件,能驱动三相BLDC和永磁同步马达,输入电压最大52.5V,每相连续输出电流最大3.5A,峰值电流6.5A,驱动器开关频率高达500kHz.本文介绍了DRV8312/32主要特性,系统框图,三相应用框图和DRV8312应用案例电路图,以及DK-LM3S-DRV8312主要特性, 马达驱动系统框图, DRV8312评估板电路图和PCB布局图.

    The DRV8312/32 are high performance, integrated three phase motor drivers with an advanced protection system.

    Because of the low RDS(on) of the power MOSFETs and intelligent gate drive design, the efficiency of these motor drivers can be up to 97%, which enables the use of smaller power supplies and heatsinks, and are good candidates for energy efficient applications.

    The DRV8312/32 require two power supplies, one at 12 V for GVDD and VDD, and another up to 50 V for PVDD. The DRV8312/32 can operate at up to 500-kHz switching frequency while still maintain precise control and high efficiency. They also have an innovative protection system safeguarding the device against a wide range of fault conditions that could damage the system.

    DRV8312/32主要特性:

    High-Efficiency Power Stage (up to 97%) with Low RDS(on) MOSFETs (80 m at TJ = 25°C)

    Operating Supply Voltage up to 50 V (70 V Absolute Maximum)

    DRV8312 (power pad down): up to 3.5 A Continuous Phase Current (6.5 A Peak)

    DRV8332 (power pad up): up to 8 A Continuous Phase Current ( 13 A Peak)

    Independent Control of Three Phases

    PWM Operating Frequency up to 500 kHz

    Integrated Self-Protection Circuits Including Undervoltage, Overtemperature, Overload, and Short Circuit

    Programmable Cycle-by-Cycle Current Limit Protection

    Independent Supply and Ground Pins for Each Half Bridge

    Intelligent Gate Drive and Cross Conduction Prevention

    No External Snubber or Schottky Diode is Required

    DRV8312/32应用:

    BLDC Motors

    Three Phase Permanent Magnet Synchronous Motors

    Inverters

    Half Bridge Drivers

    Robotic Control Systems
    20120331132727982.gif
    图1.DRV8312/32系统框图
    20120331132727667.gif
    图2.DRV8332三相应用框图
    20120331132727201.gif
    图3.DRV8312三相应用框图
    20120331132728721.gif
    图4.DRV8312应用案例电路图

    采用DRV8312和Stellaris MCU的三相BLDC马达驱动套件DK-LM3S-DRV8312

    The Medium Voltage Digital Motor Control (DMC) kit (DK-LM3S-DRV8312), shown in Figure 5, provides a great way to learn and experiment with digital control of medium voltage brushless motors to increase efficiency of operation. This document describes the DRV8312 hardware, and explains the functions and locations of jumpers and connectors present on the board.
    20120331132728256.gif
    图5. DK-LM3S-DRV8312外形图(Stellaris®版本)
    20120331132729600.gif
    图6.DRV8312基板外形图

    DK-LM3S-DRV8312主要特性:

    • Three-Phase Power Stage, DRV8312 capable of driving three-phase brushless DC motors and Permanent Magnet Synchronous Motors 52.5 V DC max input voltage

    6.5 A peak with a 3.5 A max continuous output current per phase Up to 500 khz driver switching frequency

    • 24 V switching power supply with on-board regulation for powering other analog and digital circuitry

    • Isolated CAN and SPI communication (controlCARD support-dependent)

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

    JTAG connector for external emulators (not used with Stellaris microcontrollers) Quadrature Encoder Interface (QEI) available for speed and position measurement  Hall-Sensor Interface for sensored three-phase motor control

    High precision, low-side current sensing using the Stellaris microcontroller’s high-performance ADC, Texas Instruments’ OPA365A high-speed op-amps, and Texas Instruments’ REF3025 high precision voltage reference chip

    Three PWM DACs generated by low-pass filtering the PWM signals to observe the system variables on an oscilloscope to enable easy debug of control algorithms

    Over-current protection on the inverter stage, DRV8312
    20120331132729347.gif
    图7.马达驱动系统框图
    20120331132733416.gif
    图8. DRV8312评估板电路图(1)
    20120331132739371.gif
    图9. DRV8312评估板电路图(2)
    20120331132742847.gif
    图10. DRV8312评估板电路图(3)
    20120331132743823.gif
    图11. DRV8312评估板电路图(4)
    20120331132743679.gif
    图12. DRV8312评估板元件布局图

    详情请见:
    sles256[1].pdf (1.06 MB, 下载次数: 0)
    spmu276[1].pdf (780.69 KB, 下载次数: 0)

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