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The solution of solar inverter based on Freescale digital signal controllers

Published time : 2015-10-24 Freescale
Large commercial power stations and centralized utility power station systems are among the fastest growing areas in the photovoltaic industry .Introduction of Freescale Digital Signal Controller.

Solution Introduction

These systems range in size from tens of kilowatts of commercial rooftop systems to utility-class centralized power plants that cover up to 100 megawatts and cover several acres. 

The inverters of these systems are centralized inverters, but a parallel series of inverters can also be used.

In addition to supplying AC power to the grid, centralized inverters can also be used for power factor correction.


The core advantages of solution

● Precision PWM module and high-speed conversion ADC make the 56F8xxx product line the best choice for commercial solar systems
● Highly integrated features make Freescale digital signal controllers an economical and flexible solution for power conversion applications
● The 56F82xx product family offers precision, high speed and powerful peripherals for smoother, more ideal power conversion
● Freescale digital signal controllers are supported by CodeWarrior and Processor Expert, simplifying project development and debugging

Block diagram of solar inverter based on Freescale digital signal controllers

solar inverter based on Freescale digital signal controllers




Introduction of Freescale Digital Signal Controller 

MC56F825x/MC56F824x Digital Signal Controller
The MC56F825x/MC56F824x is a member of the 56800E core-based family of digital signal controllers (DSCs). 
It combines, on a single chip, the processing power of a DSP and the functionality of a microcontroller with a flexible set of peripherals to create a cost-effective solution. Because of its low cost, configuration flexibility, and compact program code, it is well-suited for many applications. 
The MC56F825x/MC56F824x includes many peripherals that are especially useful for cost-sensitive applications, including:
• Industrial control
• Home appliances
• Smart sensors
• Fire and security systems
• Solar inverters
• Battery chargers and management
• Switched-mode power supplies and power management
• Power metering
• Motor control (ACIM, BLDC, PMSM, SR, and stepper)
• Handheld power tools
• Arc detection
• Medical devices/equipment
• Instrumentation
• Lighting ballast
The 56800E core is based on a modified Harvard-style architecture consisting of three execution units operating in parallel, allowing as many as six operations per instruction
cycle. 


The MCU-style programming model and optimized instruction set allow straightforward generation of efficient,compact DSP and control code. The instruction set is also
highly efficient for C compilers to enable rapid development of optimized control applications.

The MC56F825x/MC56F824x supports program execution from internal memories. Two data operands per instruction cycle can be accessed from the on-chip data RAM. A full set
of programmable peripherals supports various applications. 

Each peripheral can be independently shut down to save power. Any pin, except Power pins and the Reset pin, can also be configured as General Purpose Input/Outputs (GPIOs).

Key Components

No. Part Number Manufacturer
1 MC56F8245MLD NXP
2 MC56F82736VLF NXP
3 MC56F82XX FREESCALE
4 MC56F8257MLH NXP
5 MC56F8256VLF NXP
6 MC56F8256MLF NXP
7 MC56F8255VLD NXP
8 MC56F8247VLH NXP
9 MC56F8247MLH NXP
10 MC56F8246VLF NXP