ST公司的STEVAL-ISV006V2是采用SPV1040的5W太陽能電池充電器,是高效率的DC/DC轉換器,嵌入了MPPT算法,輸入電壓可低至0.3V,輸入反相極性保護.而SPV1040的輸入電壓從0.3V到本世紀5.5V,具有140 mΩ同步整流器和120 mΩ電源開關,固定的100kHz PWM頻率,效率高達成95%,主要用在智能手機和GPS系統(tǒng),小型電器和傳感器,PMP,數碼相機,玩具和手提保健設備.本文介紹了SPV1040主要特性,方框圖,應用電路以及評估板STEVAL-ISV006V2主要特性,電路圖,材料清單和PCB布局圖.
The SPV1040 device is a low power, low voltage, monolithic step-up converter with an input voltage range from 0.3 V to 5.5 V, and is capable of maximizing the energy generated by even a single solar cell (or fuel cell), where low input voltage handling capability is extremely important.
Thanks to the embedded MPPT algorithm, even under varying environmental conditions (such as irradiation, dirt, temperature) the SPV1040 offers maximum efficiency in terms of power harvested from the cells and transferred to the output.
The device employs an input voltage regulation loop, which fixes the charging battery voltage via a resistor divider. The maximum output current is set with a current sense resistor according to charging current requirements.
The SPV1040 protects itself and other application devices by stopping the PWM switching if either the maximum current threshold (up to 1.8 A) is reached or the maximum temperature limit (up to 155 °C) is exceeded.
An additional built-in feature of the SPV1040 is the input source reverse polarity protection, which prevents damage in case of reverse connection of the solar panel at the input.
SPV1040主要特性:
■ 0.3 V to 5.5 V operating input voltage
■ 140 mΩ internal synchronous rectifier
■ 120 mΩ 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 package
SPV1040應用:
■ Smart phones and GPS systems
■ Wireless headsets
■ Small appliances, sensors
■ Portable media players
■ Digital still cameras
■ Toys and portable healthcare
圖1.SPV1040方框圖
圖2.SPV1040簡化應用電路
評估板STEVAL-ISV006V2
The STEVAL-ISV006V2 demonstration board is based on the SPV1040 high efficiency solar battery charger with embedded MPPT. The SPV1040 device is a low power, low voltage, monolithic step-up converter with an input voltage range from 0.3 V to 5.5 V, and is capable of maximizing the energy generated by even a single solar cell (or fuel cell), where low input voltage handling capability is extremely important.
Thanks to the embedded MPPT algorithm, even under varying environmental conditions (such as irradiation, dirt, temperature) the SPV1040 offers maximum efficiency in terms of power harvested from the cells and transferred to the output.
The device employs an input voltage regulation loop, which fixes the charging battery voltage via a resistor divider. The maximum output current is set with a current sense resistor according to charging current requirements.
The SPV1040 protects itself and other application devices by stopping the PWM switching if either the maximum current threshold (up to 2 A) is reached or the maximum temperature limit (up to 155 °C) is exceeded.
The STEVAL-ISV006V2 demonstration board is supplied by a PV panel with PPK of 200 mW, which can be replaced with PV panels with PPK up to 5 W (VOC < 5 V) depending on application requirements.
The output load is a 220 mF, 5.5 V supercapacitor that can be replaced with lead-acid,NiCd or NiMh rechargeable batteries (max voltage = 5 and > VOC of the selected PV panel).
The demonstration board provides a simple charge status indicator using 2 LEDs, and 3 trimmers are available to allow setup according to the specific application requirements.
評估板STEVAL-ISV006V2主要特性:
■ High-efficiency monolithic step-up DC-DC converter
■ Proprietary “perturb & observe” embedded MPPT algorithm
■ Very low input voltage (down to 0.3 V)
■ Integrated N-channel and P-channel MOSFETs with low RON resistance
■ Overcurrent and overtemperature protection
■ Input reverse polarity protection
■ LED charge status indicator
■ RoHS compliant
圖3.基本的升壓應用電路
圖4.評估板STEVAL-ISV006V2外形圖
圖5.評估板STEVAL-ISV006V2電路圖
評估板STEVAL-ISV006V2材料清單:
圖6.評估板STEVAL-ISV006V2 PCB布局圖(頂層)
圖7.評估板STEVAL-ISV006V2 PCB布局圖(底層) |
