STSPV1040太阳能电池充电解决方案

ST SPV1040 太阳能电池充电解决方案关键词：电源管理 ,太阳能电池充电 ,电池充电器 , ST 公司的 SPV1040 是嵌入了 MPPT 的高效太阳能电池充电器 ,输入电压 0.3V到 5.5V,内部集成 140 mΩ 同步整流器 , 120 m Ω 功率开关 ,100kHz 固定 PWM 频率 ,占空比有 MPPT 算法来控制 ,输出电压具有稳压 ,过流和超温保护 ,主要用在智能手机和 GPS 系统 ,无线手机 ,小型电器和传感器 ,手持媒体播放器 (PMP), 数码相机 ,玩具和手持保健设备 .本文介绍了 SPV1040 主要特性 , 方框图 ,典型应用电路 ,输出并联和串联连接图 ,以及太阳能电池充电器 STEVAL-ISV006V2 电路图和材料清单与 PCB 布局图 . High efficiency solar battery charger with embedded MPPT The SPV1040 is a high efficiency, low power and low voltage monolithic step-up converter that operates over a 0.3 V to 5.5 V input voltage range which allows providing power supply to products using even down to one photovoltaic cell or fuel cells where the capability of handling low input voltages is of utmost importance. Despite the variation of several conditions over the day (like irradiation, dirt, temperature, etc.) the SPV1040 allows to achieve the maximum efficiency in terms of power harvested from the cells and transferred to the output thanks to the embedded MPPT algorithm. It employs an input voltage regulation loop, which fixes the charging battery voltage, set with a resistor divider and a maximum output current set with a current sense resistor according to charging current constraints. The SPV1040 guarantees safety of application devices and of the converter itself stopping the PWM switching in case either of reached maximum input current peak threshold set up to 1.8 A or maximum temperature limit set up to 155 ℃ . As additional feature the IC build-in an input source reverse polarity protection which prevents damaging in case of reverse connection of solar panel at the input. SPV1040 主要特性 : ■ 0.3 V to 5.5 V operating input voltage■ 140 m Ω internal synchronous rectifier■ 120 m Ω internal power active switch■ 100 kHz fixed PWM frequency ■ Duty cycle controlled by MPPT algorithm■ Output voltage regulation, overcurrent and overtemperature protection■ Input source reverse polarity protection■ Built in soft-start ■ Up to 95% efficiency■ 3 mm x 4.4 mm TSSOP8 packageSPV1040 应用 : ■ Smart phones and GPS systems■ Wireless headsets■ Small appliances, sensors■ Portable media players■ Digital still cameras■ Toys and portable healthcare图 1.SPV1040 方框图图 2.SPV1040 简化应用电路图图 3.SPV1040 输出并联连接图图 4.SPV1040 输出串联连接图采用 SPV1040 的太阳能电池充电器 STEVAL-ISV006V2 STEVAL-ISV006V2: solar battery charger using the SPV1040 The SPV1040 is a high efficiency, low power and low voltage DC-DC converter that provides a single output voltage up to 5.2 V. Startup is guaranteed at 0.3 V and the device operates down to 0.45 V when coming out from MPPT mode. It is a 100 kHz fixed frequency PWM step-up (or boost) converter able to maximize the energy generated by few solar cells (polycrystalline or amorphous). The duty cycle is controlled by an embedded unit running an MPPT algorithm with the goal of maximizing the power generated from the panel by continuously tracking its output voltage and current. The SPV1040 guarantees the safety of overall application and of converter itself by stopping the PWM switching in the case of an overcurrent or overtemperature condition. The IC integrates a 120 m Ω N-channel MOSFET power switch and a 140 m Ω P-channel MOSFET synchronous rectifier. 图 5.采用 SPV1040 的典型应用电路图 6.太阳能电池充电器 STEVAL-ISV006V2 外形图图 7. STEVAL-ISV006V2 电路图太阳能电池充电器 STEVAL-ISV006V2 材料清单 : AO-Electronics 傲壹电子 官网： www.aoelectronics.com 中文网： www.aoelectronics.cn图 8. STEVAL-ISV006V2 PCB 布局图