原标题：TI TMS320F2803x微型太阳能逆变器参考设计

　　TI公司的微型太阳能逆变器参考设计TMDSSOLARUINVKIT是采用TMS320F2803x Piccolo™微控制器(MCU)数字控制的,250W隔离的太阳能逆变器具有PV逆变器所需的所有功能,采用Piccolo-B (F28035)控制卡.支持太阳能电池板输入电压28V-45V,通用输出功率对220VAC高达280W,对110VAC高达140W,峰值效率93%,总谐波失真(THD)小于4%,采用单个C2000 Piccolo F28035 MCU控制实现了高性能控制,得到了DC/DC和DC/AC功率级的高频控制回路,简化了设计和降低系统成本.本文介绍了TMS320F2803x Piccolo主要特性和框图,以及微型逆变器框图,连接电网的太阳能微型逆变器控制框图,太阳能微型逆变器电源级框图和参考设计TMDSSOLARUINVKIT主要特性,电路图,材料清单和PCB设计图.

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

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

　　TMS320F2803x Piccolo主要特性:

　　• High-Efficiency 32-Bit CPU (TMS320C28x)

　　– 60 MHz (16.67-ns Cycle Time)

　　– 16 × 16 and 32 × 32 MAC Operations

　　– 16 × 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

　　– IEEE Standard 1149.1-1990 Standard TestAccess Port and Boundary Scan Architecture

　　• Low Cost for Both Device and System:

　　– Single 3.3-V Supply

　　– No Power Sequencing Requirement

　　– Integrated Power-on Reset and Brown-outReset

　　– Low Power

　　– No Analog Support Pins

　　• Clocking:

　　– Two Internal Zero-Pin Oscillators

　　– On-Chip Crystal Oscillator and External ClockInput

　　– Watchdog Timer Module

　　– Missing Clock Detection Circuitry

　　• Up to 45 Individually Programmable, MultiplexedGPIO Pins With Input Filtering

　　• Peripheral Interrupt Expansion (PIE) Block ThatSupports All Peripheral Interrupts

　　• Three 32-Bit CPU Timers

　　• Independent 16-Bit Timer in Each Enhanced PulseWidth Modulator (ePWM)

　　• On-Chip Memory

　　– Flash, SARAM, OTP, Boot ROM Available

　　• Code-Security Module

　　• 128-Bit Security Key and Lock

　　– Protects Secure Memory Blocks

　　– Prevents Firmware Reverse Engineering

　　• Serial Port Peripherals

　　– One Serial Communications Interface (SCI)Universal Asynchronous Receiver/Transmitter(UART) Module

　　– Two Serial Peripheral Interface (SPI) Modules

　　– One Inter-Integrated-Circuit (I2C) Module

　　– One Local Interconnect Network (LIN) Module

　　– One Enhanced Controller Area Network (eCAN)Module

　　• Enhanced Control Peripherals

　　– ePWM

　　– High-Resolution PWM (HRPWM)

　　– 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 Through Hardware

　　• Package Options

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

　　– 64-Pin PAG Thin Quad Flatpack (TQFP)

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

　　• Temperature Options

　　– T: –40℃ to 105℃

　　– S: –40℃ to 125℃

　　– Q: –40℃ to 125℃

　　(AEC Q100 Qualification for AutomotiveApplications)

　　TMS320F2803x Piccolo应用:

　　• Appliances

　　• Building Automation

　　• Electric Vehicle/Hybrid Electric Vehicle (EV/HEV)

　　Powertrain

　　• Factory Automation

　　• Grid Infrastructure

　　• Medical, Healthcare and Fitness

　　• Motor Drives

　　• Power Delivery

　　• Telecom Infrastructure

　　• Test and Measurement

　　图1.TMS320F2803x Piccolo框图

　　采用C2000 Piccolo MCU的数控太阳能微型逆变器参考设计TMDSOLARUINVKIT

　　This document presents the implementation details of a digitally-controlled solar micro inverter using theC2000 microcontroller. A 250-W isolated micro inverter design presents all the necessary PV inverterfunctions using the Piccolo-B (F28035) control card. This document describes the power stages on themicro inverter board, as well as an incremental build level system that builds the software by verifyingopen loop operation and closed loop operation. This guide describes control structures and algorithms forcontrolling power flow, maximizing power from the PV panel (MPPT), and locking to the grid using phaselocked loop (PLL), along with hardware details of Texas Instruments Solar Micro Inverter Kit(TMDSOLARUINVKIT).

　　TMDSSOLARUINVKIT is a DIMM100 controlCARD based motherboard evaluation module which uses Piccolo F28035. This development kit implements a complete grid-tied solar micro inverter. 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.

　　参考设计TMDSOLARUINVKIT主要特性:

　　Hardware Features

　　A complete solar-micro-inverter development platform with Isolated DC-DC and DC-AC power stage.

　　Supports panel voltages of 28 to 45V at input. Hence an active clamp fly-back DC/DC converter with secondary voltage multiplier is implemented on the board to enable greater efficiency. 100kHz switching is used.

　　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. Inverter switches at 50kHz.

　　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 both the DC/DC and DC/AC power stages.

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

　　Software Features

　　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.

　　Firmware for closed current loop for DC-DC and DC-AC with DC bus voltage regulation loop, along with MPPT from panel is provided.

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

　　Get Started

　　参考设计TMDSOLARUINVKIT包括:

　　Solar Micro Inverter Baseboard

　　USB and AC cable

　　Piccolo F28035 Isolated controlCARD

　　图2.参考设计TMDSOLARUINVKIT外形图

　　The kit contents include:

　　• TMDSSOLARUINVKIT base board

　　• TMDSCNCD28035ISO control card

　　• USB mini to A cable

　　• 15-V DC external isolated bias supply

　　• 12-V DC external isolated bias supply

　　• AC cord

　　参考设计TMDSOLARUINVKIT材料清单:

　　详情请见:

20180528111518567.pdf

20180528111535914.pdf

20180528111542777.pdf

20180528111528523.pdf