DSP of three major motor control solutions (1): TMS320F28335

For more information on motor control solutions, click on the MCU and FPGA sections of the motor control scheme:

MCU articles of three major motor control solutions

FPGA of three major motor control solutions

In recent years, DSP-based motor ASICs have gradually replaced SCMs in motor control systems because of their superior performance in terms of computational speed and capacity storage. Most current motors use current loop control as a co-processing of the DSP, while speed or position loop control is implemented by the DSP chip. Under normal circumstances, because the position control is flexible and the difference is large, it is difficult to achieve versatility, so the position loop is generally completed directly by the DSP; but the speed and current loops are relatively versatile and closely related, so as to be high. The speed control of performance is inseparable from the current control, so it can be integrated into one chip for processing, which can realize speed servo control, separate current control, and can form a position servo system together with DSP.

There are only a handful of manufacturers focusing on motor control DSP solutions. As the world's most famous DSP chip manufacturer, TMS320 series chips produced by Texas Instruments are widely used in various fields. The TMS320C2000 series is for industrial control. DSP chip.

Introduction to TMS320F28335

The TMS320F28335 digital signal processor is a floating point DSP controller belonging to the C2000 series. Compared with the previous fixed-point DSP, the device has high precision, low cost, low power consumption, high performance, high peripheral integration, large data and program storage, and more accurate and fast A/D conversion.

TMS320F28335 has 150MHz high-speed processing capability, 32-bit floating-point processing unit, 6 DMA channels support ADC, McBSP and EMIF, with up to 18 PWM outputs, of which 6 are TI's unique higher precision PWM outputs. (HRPWM), 12-bit 16-channel ADC. Thanks to its floating-point arithmetic unit, users can quickly write control algorithms without spending too much time and effort on processing fractional operations, with an average performance increase of 50% compared to previous generation DSPs, and with fixed-point C28x controller software. Compatible, simplifying software development, shortening development cycles, and reducing development costs.

Functional block diagram

DSP of three major motor control solutions (1): TMS320F28335

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