原标题：TI TIDA-00998超低功耗能量收获和电源管理参考设计

　　TI公司的TIDA-00998是采用bq25505超低功耗升压充电器的超低功耗能量收获和电源管理参考设计.太阳能收获能对锂电池充电,能在初级非充电和次级可充电间自动切换,用来给LED驱动器和TIDA-00807供电,能驱动多达六个单独的LED.本文介绍了bq25505主要特性和框图,应用电路,以及能量收获参考设计TIDA-00998主要特性,框图,主要系统指标和电路图,材料清单和PCB设计图.

　　The bq25505 device is specifically designed to efficiently extract the microwatts (µW) to miliwatts (mW) of power generated from a variety of DC energy harvesting, high-impedance sources like photovoltaic (solar) or thermal electric generators (TEGs) without collapsing those sources. The battery-management features of the bq25505 ensure that a secondary rechargeable battery is not overcharged by this extracted power, with voltage boosted, nor depleted beyond safe limits by a system load. The integrated multiplexer gate drivers autonomously switch the system load to a primary nonrechargeable battery if the secondary battery voltage falls below the user-defined VBAT_OK threshold.

　　bq25505主要特性:

　　Ultra Low-Power With High-Efficiency DC-DC Boost Charger

　　Cold-Start Voltage: VIN ≥ 330 mV

　　Continuous Energy Harvesting From Input Sources as Low as 100 mV

　　Ultra-Low Quiescent Current of 325 nA

　　Input Voltage Regulation Prevents Collapsing High-Impedance Input Sources

　　Ship Mode With< 5 nA From Battery

　　Energy Storage

　　Energy can be Stored to Rechargeable Li-Ion Batteries, Thin-Film Batteries, Super-Capacitors, or Conventional Capacitors

　　Battery Charging and Protection

　　Internally Set Undervoltage Level

　　User-Programmable Overvoltage Level

　　Battery-Good Output Flag

　　Programmable Threshold and Hysteresis

　　Warn Attached Microcontrollers of Pending Loss of Power

　　Can be Used to Enable or Disable System Loads

　　Programmable Maximum Power Point Tracking (MPPT)

　　Integrated MPPT for Optimal Energy Extraction From a Variety of Energy Harvesters

　　Gate Drivers for Primary (Nonrechargeable) and Secondary (Rechargeable) Storage Element Multiplexing

　　Autonomous Switching Based on VBAT_OK

　　Break-Before-Make Prevents System Rail Droop

　　bq25505应用:

　　• Energy Harvesting

　　• Solar Chargers

　　• Thermal Electric Generator (TEG) Harvesting

　　• Wireless Sensor Networks (WSN)

　　• Industrial Monitoring

　　• Environmental Monitoring

　　• Bridge and Structural Health Monitoring (SHM)

　　• Smart Building Controls

　　• Portable and Wearable Health Devices

　　• Entertainment System Remote Controls

　　图1.bq25505功能框图

　　图2.bq25505带初级和次级电池的典型太阳能应用电路图

　　图3.bq25505不带初级电池的典型TEG应用电路图

　　图4.bq25505带初级和次级电池的典型压电应用电路图

　　能量收获参考设计TIDA-00998

　　Fault indicators are used on overhead transmissionlines for monitoring power cables. Their primary task isto detect fault conditions and indicate using LEDs.

　　A key challenge for fault indicators is in managingenergy storage and consumption so that they last foran extended period of time when the line is down andstartup the end equipment quickly. This TI Designshows multiple architectures for extending primarybattery life using a secondary battery orsupercapacitor with energy harvested from a currenttransformer (CT) or solar cells. Optimal powermanagement is done using efficient LED drivers todrive series or parallel strings of LEDs to controlintensity for uniform 360° visibility.

　　能量收获参考设计TIDA-00998主要特性:

　　• Energy Harvesting and Power Management:

　　– Solar Energy Harvesting to Charge Li-IonBattery; AutoswitchingBetween Primary (Non-Rechargeable) and Secondary (Rechargeable)Storage Elements to Power LED Driver andTIDA-00807

　　– Interface to CT-Based Energy HarvestingSubsystem for Load Current Harvesting to

　　Charge Supercapacitor; Power Mux toAutoswitchBetween Supercapacitor andPrimary Battery

　　• HMI—High Intensity LED:

　　– Drives up to Six Independent LEDs and ThreeChannels Paralleled to Drive High-Current LEDUsing LP55231

　　– Drives LEDs Connected in String Using LM3509

　　– Three-Level LED Intensity Control Based onAmbient Light Level Sensed by OPT3001

　　– Light Sensor and LED Drivers Interfaced UsingI2C (Can Connect to J2 of TIDA-00807)

　　能量收获参考设计TIDA-00998应用:

　　• Overhead Fault Indicators

　　• Overhead Fault Passage Indicators

　　图5.能量收获参考设计TIDA-00998外形图和硬件接口框图

　　能量收获参考设计TIDA-00998主要系统指标:

　　能量收获参考设计TIDA-00998材料清单: