低压MOS在光伏优化器(MPPT)上的应用-REASUNOS瑞森半导体

REASUNOS

一、前言

光伏优化器，英名简称MPPT，又称光伏功率优化器和组件功率优化器，是一种智能设备，旨在提高光伏组件的能源效率和稳定性。

光伏优化器(MPPT)的作用：

光伏优化器用于多个光伏组件串联形成的组件串中，用来实时追踪到单块组件的最大功率点。来解决因阴影遮挡、组件朝向差异或组件衰减不一致所造成的光伏系统发电量降低的问题。

光伏优化器(MPPT)的原理：

每块光伏组件连接一个具有最大功率点跟踪功能的优化器，且每个光伏组件的输出接入至优化器模块的输入端。优化器监控并优化每块光伏电池板的电能，即使阵列中任意一块电池板出现失配问题时，其他电池板仍然能输出最大功率，因而能够补偿因失配问题而产生的发电量损失。

光伏优化器(MPPT)的价值：

1、提高了组件遮阴导致发电量降低问题；

2、在无遮阴情况下使用优化器，能提高约1%的发电量；

3、解决光伏组件的适配情况，可提高约2%的组件适配损失，从而提高发电量；

4、优化器能检测每块光伏组件的参数，能精确定位问题点， 减少运维费用。

低压MOS在光伏优化器(MPPT)上的应用

二、典型应用拓扑图


光伏优化器(MPPT)非隔离 DC-DC 升压电路

三、典型应用及选型推荐

光伏优化器(MPPT)采用非隔离 DC-DC 升压电路， DC-DC应用中MOS的开关频率高达几百KHz，对MOS的动态参数要求较高。针对光伏优化器的DC-DC电路，推荐使用瑞森半导体低压MOS-SGT 系列。极低导通电阻，低损耗，高雪崩耐量，高效率，非常适合高频应用，封装为DFN5*6。

光伏优化器(MPPT)的低压MOS产品选型

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