原标题：TI F2803x 32位MCU太阳能微逆变器开发方案

　　TI公司的F2803x系列产品采用C28x核和控制加速器(CLA),是高效率的32位CPU,工作频率60MHz,16x16和32x32MAC运算, 16x16双MAC,具有哈佛总线架构和快速中断响应和处理,工作电压3.3V,主要用在智能电网和动力线通信,白色家电,开关电源,DC/DC多输出电源, 太阳能微逆变器和转换器, 缝纫机和纺织机,功率因素修正以及AC/DC逆变器.本文介绍了F2803x 系列主要特性,框图, 太阳能微逆变器开发套件主要特性,连网/离网太阳能微逆变器框图,太阳能微逆变器系统框图,电器指标和详细电路图.

　　The F2803x Piccolo family of microcontrollers provides the power of the C28x core and Control Law Accelerator (CLA) coupled with highly integrated control peripherals in low pin-count devices. This family is code-compatible with previous C28x-based code, as well as providing a high level of analog integration.

　　An internal voltage regulator allows for single-rail operation. Enhancements have been made to the HRPWM module to allow for dual-edge control (frequency modulation). Analog comparators with internal 10-bit references have been added and can be routed directly to control the PWM outputs. The ADC converts from 0 to 3.3-V fixed full-scale range and supports ratio-metric VREFHI/VREFLO references. The ADC interface has been optimized for low overhead and latency.

　　F2803x 系列主要特性:

　　High-Efficiency 32-Bit CPU (TMS320C28x)

　　60 MHz (16.67-ns Cycle Time)

　　16 x 16 and 32 x 32 MAC Operations

　　16 x 16 Dual MAC

　　Harvard Bus Architecture

　　Atomic Operations

　　Fast Interrupt Response and Processing

　　Unified Memory Programming Model

　　Code-Efficient (in C/C++ and Assembly)

　　Programmable Control Law Accelerator (CLA)

　　32-Bit Floating-Point Math Accelerator

　　Executes Code Independently of the Main CPU

　　Endianness: Little Endian

　　JTAG Boundary Scan Support(1)

　　Low Cost for Both Device and System:

　　Single 3.3-V Supply

　　No Power Sequencing Requirement

　　Integrated Power-on Reset and Brown-out Reset

　　Low Power

　　No Analog Support Pins

　　Clocking:

　　Two Internal Zero-pin Oscillators

　　On-Chip Crystal Oscillator/External Clock Input

　　Dynamic PLL Ratio Changes Supported

　　Watchdog Timer Module

　　Missing Clock Detection Circuitry

　　Up to 45 Individually Programmable, Multiplexed GPIO Pins With Input Filtering

　　Peripheral Interrupt Expansion (PIE) Block That Supports All Peripheral Interrupts

　　Three 32-Bit CPU Timers

　　Independent 16-Bit Timer in Each ePWM Module

　　On-Chip Memory

　　Flash, SARAM, OTP, Boot ROM Available

　　Code-Security Module

　　128-Bit Security Key/Lock

　　Protects Secure Memory Blocks

　　Prevents Firmware Reverse Engineering

　　Serial Port Peripherals

　　One SCI (UART) Module

　　Two SPI Modules

　　One Inter-Integrated-Circuit (I2C) Bus

　　One Local Interconnect Network (LIN) Bus

　　One Enhanced Controller Area Network (eCAN) Bus

　　Enhanced Control Peripherals

　　Enhanced Pulse Width Modulator (ePWM)

　　High-Resolution PWM (HRPWM) Module

　　Enhanced Capture (eCAP) Module

　　High-Resolution Input Capture (HRCAP) Module

　　Enhanced Quadrature Encoder Pulse (eQEP) Module

　　Analog-to-Digital Converter (ADC)

　　On-Chip Temperature Sensor

　　Comparator

　　Advanced Emulation Features

　　Analysis and Breakpoint Functions

　　Real-Time Debug via Hardware

　　2803x Packages

　　56-Pin RSH Very Small Quad Flatpack (No Lead) (VQFN)

　　64-Pin PAG Thin Quad Flatpack (TQFP)

　　80-Pin PN Low-Profile Quad Flatpack (LQFP)

　　F2803x 应用:

　　• Smart Grid and Power Line Communications

　　• White Goods

　　• Switch Mode Power Supplies (SMPSs)

　　• DC-DC Multiple-Output Power Supplies

　　• Solar Micro Inverters and Converters

　　• Power Factor Correction

　　• Sewing and Textile Machines

　　• AC-DC Inverters

　　图1. F2803x功能框图

　　太阳能微逆变器开发套件

　　This development kit implements a complete grid-tied solar micro inverter based around TI’s C2000 Piccolo™ TMS320F28035 microcontroller (MCU).

　　The Solar Micro Inverter Development Kit introduces designers to a fully-suitable MCU for solar micro inverter applications, and guides users seamlessly through the design process and application challenges.

　　Users can evaluate the design initially through a simple graphical interface without the need to dive into code development. When ready to explore in further depth, detailed theory-based documentation guides users step-by-step through the software and hardware implementation by incrementally building from open loop to closed loop operation of the solar micro inverter.

　　太阳能微逆变器开发套件主要特性:

　　Implements control of an active clamp fly-back DC/DC converter with secondary voltage multiplier, MPPT and a grid-tied DC/AC inverter, comprising the power conversion stages of the solar micro inverter.

　　Supports panel voltages of 28 to 45V at input as well as universal power output at up to 280W for 220VAC and up to 140W for 110VAC, making it suitable for the diverse requirements of worldwide solar markets.

　　93 percent peak efficiency and less than four percent total harmonic distortion (THD) provide more power output per solar panel, reducing detrimental heat dissipation and increasing system longevity.

　　The C2000 Piccolo F28035 MCU serves as a high-performance controller for the complete micro inverter system, executing high-frequency control loops for the DC/DC and DC/AC power stages.

　　Single MCU system implementation offers design simplicity and reduced system cost.

　　The C2000 Piccolo F28035 MCU operates the inverter at a high PWM frequency, 100 KHz, to reduce harmonic distortion and lower passive component costs.

　　Integrated features of the C2000 Piccolo F28035 MCU enable efficient control of each power stage: 4.6 MSPS 12-bit ADC, low latency C28x real-time processing core and feature-packed, 150 ps high-resolution PWM modules.

　　Complete software source code, hardware design files and detailed documentation allow designers to see and understand exactly how the design was implemented, creating the foundation to begin their own unique solar power implementations.

　　Solar and digital power software libraries provide code-optimized building blocks to implefment a variety of power topologies and algorithms such as MPPT and Software Phase Locked Loops (PLL), perfect for designing customized solar inverter solutions.

　　图2. 太阳能微逆变器开发板外形图

　　太阳能微逆变器开发套件包括:

　　TMDSCNCD28035ISO Piccolo™ controlCARD

　　Solar Micro Inverter baseboard

　　External Power Supplies

　　USB cable

　　AC Power Cable

　　图3. 太阳能微逆变器系统框图

　　图4. 连网太阳能微逆变器框图

　　图5.离网太阳能微逆变器框图

　　太阳能微逆变器主要指标: