不间断电源(UPS)的主要目的是要给负载提供清洁干净和稳定的电能源.不间断电源广泛用在办公设备,计算机,通信系统,医疗和日常生活以及其它许多重要系统. 最近的市场要求UPOS的可靠性达到99.999%,具有零开关时间的性能,以及复杂的网络连接和控制方法如简化的网络管理协议(SNMP). Freescale 提供UPS的半导体解决方案,它采用56F8300数字信号控制器(DSC),该DSC采用56800E内核,在单片内具有DSP的计算功能和MCU控制器的特性,非常适合UPS的设计.这些DSC有许多专用的外设,包括PWM单元,ADC,计时器,通信接口如SCI,SPI,CAN以及板上的闪存和RAM. 56F8300数字信号控制器能提供UPS所有的控制功能:

电源的在线/离线控制,
DCBus电压调整,
输入功率因素调整,
电池管理,
AC输出电压调整
输入和输出频率同步,
电源监视,
系统自诊断和自保护
紧急事件处理,
实时多任务系统运行
通信协议.

Network-Enabled High Performance Triple Conversion UPS

图1: 基本的在线UPS



图2:简化的UPS 原理图
The main purpose of an Uninterruptible Power Supply (UPS) is to provide clean and stable power to a load, regardless of power grid conditions such as black-outs. Uninterruptible Power Supplies have been widely used for office equipment, computers,communication systems, medical/life support and many other critical systems. Recent market requirements include a target expectation for UPS reliability of 99.999% power availability, performance demands of zero switch over time, and complex network connectivity and control methods, such as Simple Network Management Protocol (SNMP).

Presently, a UPS is often implemented with an MCU. But MCUs have significant price/performance limitations that can be rectified by implementing the UPS using a hybrid MCU with efficient digital signal processing capability. This has not been possible until recently, due to performance and the cost of the processors required to do the job. The 56F8300 series of digital

signal controllers has the required performance, peripherals, and price targets to enable UPS designs to implement advanced features.
Freescale 半导体解决方案

The digital 56800/E network-enabled high-performance UPS reduces system component count, increases system reliability, and enables advanced functions while reducing cost. Key advantages of this digitally-controlled UPS include:

Single-device solution which combines MCU functionality and DSP processing power
Bidirectional AC/DC conversion
High input power factor with Direct PFC and lower power pollution to the power grid
Extended battery life and lower maintenance costs
Power source and load conditioning can be monitored in real time
Network communication for remote control and monitoring
Expedites time-to-market using out-of-the-box software components

All necessary control functions are implemented within the controller, such as:

Power on/off control
DCBus voltage regulation
Input power factor correction
Battery management
AC output voltage regulation
Frequency synchronization of input and output
Power source monitoring
System self diagnostics and self protection
Emergency event processing
Real-time multi-tasking system operation
Communication protocols

图3. 在线三转换UPS方框图



图4:UPS样机外形图