Linear LTC3108超低电压能量收集和管理方案

Linear 公司的LTC3108是超低电压建立的转换器和功率管理器,它的高度集成DC/DC转换器非常适合用作低输入电源如热电发生器,热电堆和小型太阳能电池的能量收集(energy-harvesting)和管理剩余电能,输入电压可低至20mV,输出电压可选择为2.35V, 3.3V, 4.1V 或5V,静态电流仅为6uA,主要应用在远端传感器和射频电源,剩余热能收集,HVAC,工业无线传感网络,自动读表,建筑物自动化以及室内光能收集.本文介绍LTC3108的主要特性, 方框图, 无线遥控传感器应用电路, 用于无线遥控传感器应用的Peltier能量收集电路, 室内光能电池对锂离子电池充电器电路, 采用热电堆对超大电容的充电电路以及DC和AC输入能量收集和电能管理电路.

LTC3108: Ultralow Voltage Step-Up Converter and Power Manager

The LTCR3108 is a highly integrated DC/DC converter ideal for harvesting and managing surplus energy from extremely low input voltage sources such as TEG (thermoelectric generators), thermopiles and small solar cells. The step-up topology operates from input voltages as low as 20mV.

Using a small step-up transformer, the LTC3108 provides a complete power management solution for wireless sensing and data acquisition. The 2.2V LDO powers an external microprocessor, while the main output is programmed to one of four fixed voltages to power a wireless transmitter or sensors. The power good indicator signals that the main output voltage is within regulation. A second output can be enabled by the host. A storage capacitor provides power when the input voltage source is unavailable. Extremely low quiescent current and high efficiency design ensure the fastest possible charge times of the output reservoir capacitor.

The LTC3108 is available in a small, thermally enhanced 12-lead (4mmx3mm) DFN package and a 16-lead SSOP package.

主要特性:

Operates from Inputs of 20mV

Complete Energy Harvesting Power Management System

Selectable VOUT of 2.35V, 3.3V, 4.1V or 5V

LDO: 2.2V at 3mA

Logic Controlled Output

Reserve Energy Output

Power Good Indicator

Ultralow IQ: 6μA

Uses Compact Step-Up Transformers

Small 12-Lead (4mmx 3m) DFN or 16-Lead SSOP Packages

应用:

Remote Sensors and Radio Power

Surplus Heat Energy Harvesting

HVAC

Industrial Wireless Sensing

Automatic Metering

Building Automation

Indoor Light Energy Harvesting


图1.LTC3108方框图

图2.LTC3108无线遥控传感器应用电路

图3.用于无线遥控传感器应用的Peltier能量收集电路

图4.室内光能电池对锂离子电池充电器电路

图5.采用热电堆对超大电容的充电电路

图6.DC和AC输入能量收集和电能管理电路