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基于Renesas公司的RX23T24V马达控制评估系统

来源：中电网

2018-12-11

类别：工业控制

219

拍明

原标题：Renesas RX23T24V马达控制评估系统

　　Renesas公司的RX23T系统是内置浮点处理单元(FPU)的32位RX微控制器(mcu),工作频率40MHz,65.6DMIPS,集成了12位ADC和40MHz PWM,很容易对复杂的逆变器控制算法进行编程,从而大大地降低软件开发的人工成本和维护费用.单电源2.7-V到 5.5-V工作,主要用在通用和消费类电子设备.本文介绍了RX23T系列主要特性,框图和采用RX23T的24V马达控制评估系统主要特性和套件指标,评估系统框图,电路图,材料清单和PCB设计图.

　　The RX23T Group is 32-bit microcontroller and suited for single inverter control and has a built-in FPU (floating-point processing unit) that enables it to easily program complex inverter control algorithms. This helps to greatly reduce the man-hours required for software development and maintenance. Furthermore, thanks to the RX200 core the current consumed in software standby mode (with RAM retention) is a mere 0.45 μA. RX23T microcontrollers operate in a broad voltage range from 2.7 V to 5.5 V, which is useful for inverter control, and are highly compatible with the RX62T Group at the pin arrangement and software level.

　　RX23T系列主要特性:

　　■ 32-bit RX CPU core

　　Max.operating frequency: 40 MHzCapable of 65.6 DMIPS in operation at 40 MHz

　　Enhanced DSP: 32-bit multiply-accumulate and 16-bitmultiply-subtract instructions supported

　　 Built-in FPU: 32-bit single-precision floating point(compliant to IEEE754)

　　 Divider (fastest instruction execution takes two CPU clockcycles)

　　 Fast interrupt

　　 CISC Harvard architecture with 5-stage pipeline

　　 Variable-length instructions, ultra-compact code

　　 On-chip debugging circuit

　　 Memory protection unit (MPU) supported

　　■ Low power design and architecture

　　 Operation from a single 2.7-V to 5.5-V supply

　　 Three low power consumption modes

　　■ On-chip code flash memory, no wait states

　　 128-/64-Kbyte capacities

　　 On-board or off-board user programming

　　■ On-chip SRAM, no wait states

　　 12 Kbytes of SRAM

　　■ DMA

　　 DTC: Four transfer modes

　　■ Reset and supply management

　　 Seven types of reset, including the power-on reset (POR)

　　 Low voltage detection (LVD) with voltage settings

　　■ Clock functions

　　 Main clock oscillator frequency: 1 to 20 MHz

　　 External clock input frequency: Up to 20 MHz

　　 PLL circuit input: 4 MHz to 12.5 MHz

　　 On-chip low-speed oscillator, on-chip high-speedoscillator, dedicated on-chip oscillator for the IWDT

　　 Clock frequency accuracy measurement circuit(CAC)

　　■ Independent watchdog timer

　　 15-kHz on-chip oscillator produces a dedicated clocksignal to drive IWDT operation.

　　■ Useful functions for IEC60730 compliance

　　 Self-diagnostic and disconnection-detection assistancefunctions for the A/D converter, clock frequency accuracymeasurement circuit, independent watchdog timer, RAMtest assistance functions using the DOC, etc.

　　■ MPC

　　 Multiple locations are selectable for I/O pins of peripheralFunctions

　　■ Up to 4 communications channels

　　 SCI with many useful functions (2 channels)Asynchronous mode, clock synchronous mode, smart cardinterface mode, simplified SPI, simplified I2C, andextended serial mode.

　　 I2C bus interface: Transfer at up to 400 kbps (one channel)

　　 RSPI capable of high speed connection (one channel)

　　■ Up to 12 extended-function timers

　　 16-bit MTU3: 40MHz operation, input capture, outputcompare, three-phase complementary PWM output, CPUefficientcomplementary PWM, phase counting mode (sixchannels)

　　 8-bit TMRs (4 channels),

　　 16-bit compare-match timers (4 channels)

　　■ 12-bit A/D converter: 10ch

　　 On-chip sample-and-hold circuit: 12bit × up to 3 channels

　　 Sampling time can be set for each channel

　　 Self-diagnostic function and analog input disconnectiondetection assistance function (compliant to IEC60730)

　　 ADC: three sample-and-hold circuits, double dataregisters, comparator (3 channels)

　　■ Register write protection function can protectvalues in important registers againstoverwriting.

　　■ Up to 50 pins for general I/O ports

　　 5-V tolerant, open drain, input pull-up

　　■ Operating temperature range

　　 40 to +85 C

　　 40 to +105 C

　　RX23T应用:

　　 General industrial and consumer equipment

　　图1.RX23T系列框图(1)

　　图2.RX23T系列框图(2)

　　采用RX23T的24V马达控制评估系统

　　Due to rising concerns about global warming issues and demands to reduce power costs, power consumption reduction requirements (energy-saving requirements) for electronic equipment and devices are becoming more severe. It is said that power consumption by motors in home appliances makes up over half of the total power consumption of a common household. Thus, it can be said that reducing motor power consumption is the key to saving energy.

　　There are various methods of controlling a motor. Among them, the best control method for reducing power consumption is inverter control. Although inverter control demonstrates a tremendous ability to achieve energy savings, there are more than a few challenges associated with its implementation. The difficulty of carrying out the inverter control itself, the complicated hardware, and high cost are the typical challenges. Renesas has developed and provides solutions that help overcome such challenges.

　　The 24V Motor Control Evaluation System for RX23T comes with a low-voltage permanent magnet synchronous motor (24V, 0.42A brushless DC motor) that makes it easy to start evaluating motor control. The preprogrammed sensorless vector control program allows you to run the motor immediately out of the box. You can evaluate different microcontrollers or algorithms by using optional CPU cards or downloading and installing sample code.

　　The motor control board of the product consists of two parts: an inverter board and a CPU card. Each product version is equipped with a CPU card on which the designated microcontroller model is mounted.