基于AS8002设计的太阳能电源逆变技术

2011-10-26 15:10:55来源: 互联网
interrupt detects a high current on the grid and allows the processor to open the switches without waiting for the ADC conversion.

AS8002主要特性:

12-Bit 100 kSPS ADCs for accurate voltage and current measurement

Programmable gain amplifiers to accommodate for different sensors

Three multiplexed inputs to the 12-Bit ADC for secondary measurements that require high accuracy and fast sampling rates

On chip temperature sensor connected to one of the inputs of the multiplexer

On-chip voltage reference with small temperature coefficient (10ppm/K typ). This reference is available at the pin REF.

Low power on chip oscillator

SPI compatible interface

Internal registers for easy offset and gain compensation

Interrupt alerts (including Under Voltage Lock-Out and Over Temperature)

Independent programmable over current interrupt

AS8002应用:

The AS8002 is suitable for PV inverter grid monitoring, Wind inverter grid monitoring, Isolated voltage sensing, Uninterruptible Power supplies and Power conditioners.

图1.AS8002方框图

图2.AS8002典型应用电路图

AS8002电源逆变器适配器板

Power inverters in solar photovoltaic systems are often connected directly to the electricity grid in order to inject the created energy into the mains and act as an electricity supplier. This energy must comply with certain regulations that set the standard in terms of quality and safety which requires of accurate measurements.

The AS8002 is a highly accurate measurement IC that allows monitoring the generated energy with low cost shunt resistors or other sensors for the current and resistor dividers for the voltage. This approach allows avoiding more expensive sensing devices while achieving the required accuracy for DC and AC measurements of current and voltage as well as stability over the operating temperature range of the inverter.

The 12 bit ADC samples the voltage and current and provides their instantaneous values through an SPI interface.

The 12 Bit ADC is preceded by low noise programmable gain amplifiers in order to accommodate different sensors. The ADC has three multiplexed inputs, offering one secondary channel in addition to the main voltage and current.

The on-chip temperature sensor provides the inverter designer the option of temperature compensation for any of the measured parameters or functional blocks provided, over the full operating temperature range of the device.

The on-chip voltage reference is connected to the ADC and to REF. An external crystal oscillator is not required as a high accuracy internal oscillator clock is available.

The independent over current interrupt detects a high current on the grid and allows the processor to open the switches without waiting for the ADC conversion.

The AS8002 Adapter Board

The AS8002-AB-1.0 Adapter board allows you an easy-to-use evaluation of the essential functions of the AS8002. It is a system with built-in microcontroller, USB interface and a simple analogue frontend. The complete system is fully supplied by the PC and needs no additional external power supply.


图3.AS8002电源逆变器适配器板外形图

图4.AS8002适配器板电路图

关键字:AS8002  太阳能  电源逆变

编辑:神话 引用地址:http://www.eeworld.com.cn/mndz/2011/1026/article_12585.html
本网站转载的所有的文章、图片、音频视频文件等资料的版权归版权所有人所有,本站采用的非本站原创文章及图片等内容无法一一联系确认版权者。如果本网所选内容的文章作者及编辑认为其作品不宜公开自由传播,或不应无偿使用,请及时通过电子邮件或电话通知我们,以迅速采取适当措施,避免给双方造成不必要的经济损失。
论坛活动 E手掌握
微信扫一扫加关注
论坛活动 E手掌握
芯片资讯 锐利解读
微信扫一扫加关注
芯片资讯 锐利解读
推荐阅读
全部
AS8002
太阳能
电源逆变

小广播

独家专题更多

富士通铁电随机存储器FRAM主题展馆
富士通铁电随机存储器FRAM主题展馆
馆内包含了 纵览FRAM、独立FRAM存储器专区、FRAM内置LSI专区三大部分内容。 
走,跟Molex一起去看《中国电子消费品趋势》!
走,跟Molex一起去看《中国电子消费品趋势》!
 
带你走进LED王国——Microchip LED应用专题
带你走进LED王国——Microchip LED应用专题
 
电子工程世界版权所有 京ICP证060456号 京ICP备10001474号 电信业务审批[2006]字第258号函 京公海网安备110108001534 Copyright © 2005-2016 EEWORLD.com.cn, Inc. All rights reserved