LinearLTC压电能量收集电源方案

Linear LTC3588-1压电能量收集电源方案

关键字：电源管理,能量收集器,DC/DC转换器Linear 公司的LTC3588-1是压电能量收集电源,集成了低噪音全波整流和高效降压转换器,组成完整的能量收集解决方案,最适合高输出阻抗的能量源如压电传感器.输入电压2.7V-20V,输出电流高达100mA,可选输出电压1.8V, 2.5V, 3.3V和3.6V,可用于压电能量收集,电-机械能量收集,无线HVAC传感器,轮胎压里传感器,遥控光开关,毫微瓦降压稳压器.本文介绍LTC3588-1主要特性,方框图以及多种应用电路图,包括

100mA压电能量收集电源电路图, 最小尺寸的1.8V低压输入压电能量收集电源电路图, 电场能量和热电能量收集器电路图等.

LTC3588-1: Piezoelectric Energy Harvesting Power Supply

The LTC.3588-1 integrates a low-loss full-wave bridge rectifier with a high efficiency buck converter to form a complete energy harvesting solution optimized for high output impedance energy sources such as piezoelectric transducers. An ultralow quiescent current

undervoltage lockout (UVLO) mode with a wide hysteresis window allows charge to accumulate on an input capacitor until the buck converter can effi ciently transfer a portion of the stored charge to the output. In regulation, the LTC3588-1 enters a sleep state in which both input and output quiescent currents are minimal. The buck converter turns on and off as needed to maintain regulation.

Four output voltages, 1.8V, 2.5V, 3.3V and 3.6V, are pin selectable with up to 100mA of continuous output current; however, the output capacitor may be sized to service a higher output current burst. An input protective shunt set at 20V enables greater energy storage for a given amount of input capacitance.

LTC3588-1主要特性:

950nA Input Quiescent Current (Output in Regulation – No Load)

450nA Input Quiescent Current in UVLO

2.7V to 20V Input Operating Range

Integrated Low-Loss Full-Wave Bridge Rectifier

Up to 100mA of Output Current

Selectable Output Voltages of 1.8V, 2.5V, 3.3V, 3.6V High Efficiency Integrated Hysteretic Buck DC/DC

Input Protective Shunt – Up to 25mA Pull-Down at VIN ≥ 20V

Wide Input Undervoltage Lockout (UVLO) Range

Available in 10-Lead MSE and 3mm x3mm DFN Packages

LTC3588-1应用:

Piezoelectric Energy Harvesting

Electro-Mechanical Energy Harvesting Wireless HVAC Sensors

Mobile Asset Tracking

Tire Pressure Sensors

Battery Replacement for Industrial Sensors Remote Light Switches

Standalone Nanopower Buck Regulator

图1.LTC3588-1方框图

图2.LTC3588-1 100mA压电能量收集电源电路图

图3.LTC3588-1 3.3V压电能量收集电源电路图:给带无线发送器的微处理器和50mA瞬态负载供电.

图4.最小尺寸的1.8V低压输入压电能量收集电源电路图

图5.采用单个压电晶体和自动加电次序的双电源电路图

图6.带备份电池的压电能量收集器电路图

图7.AC火线供电的3.6V降压稳压器,大输出电容支持重负载

图8.电场能量收集器电路图

图9.5-16V太阳能供电的2.5V电源,其超大电容增加输出能量存储和备份电池

图10.热电能量收集器电路图