Harvester electricity

Considerable interest in the article «Can ionistor replace the battery» led promoting further research and developments on the topic of self-contained power sources, using controllers collecting and energy storage.

At the end of the article briefly displayed the idea of ​​modernization construction, to experiment, and is given a sketch in pencil.

For the new design has been developed circuit board design that worked so that in it could build several configurations, which will be mentioned in this and the following articles. To control the drive controller is added to the design SPV1050.

For a more detailed analysis of the controller SPV1050 ordered evaluation boards STEVAL-ISV019V1 and STEVAL-IDS002V1 from the company STMicroelectronics.
The developed energy storage device consists of a solar cell, the controller collecting energy and battery SPV1050, supercapacitors or battery.

developed energy storage configurations:
1. Light sensor, controller, ionistor;


2. Light sensor, controller, battery Ni-MH;


Dimensions of the board: 85 x 55 x 8 (12) mm

ionistor Panasonic EECS5R5H105


Specifications:
Capacity: 1 F; Max. Operating voltage: 5.5 V DC; Operating temperature range: -25 - + 70 ° C; Operating hours at 70 ° C: 1000 hours.
Batteries Eneloop Pro


For the experiments were selected accumulators size AAA Eneloop Pro in an amount of 4 units and a capacity of 900 mA each. The choice of the brand of batteries caused quite good characteristics: the ability to work at low temperatures up to -20 ° C with a high current output, low self-discharge - 15% for the year of storage and no memory effect.

Specifications:
The type, size NiMh, AAA; The capacity of a typical 950 mAh, 900 mAh minimum; The number of cycles 500; Self-discharge 15% for the year of storage; Voltage 1.2; The time and current fast-charge 1.1 hours, 950 mA; Weight 13 gr.; < Dimensions 10.5 x 44.5 mm; Country of Japan.
About the controller SPV1050


SPV1050 - a new controller to harvest energy from the environment STMicroelectronics. Highly mikropotreblyayuschy collector energy environment with a charger and two voltage regulators in a single package simplifies design and extends the capabilities of small autonomous devices.
The controller collects light energy or heat to power small electronic devices, which include wireless sensors, industrial equipment, controllers and sensors smart home, wearable devices, creating opportunities for the world of the Internet of things.

Why choose this controller? B>
Compared with peers, SPV1050 chip has more features rather high efficiency of about 90%, and small size. The minimum number of binding elements can reduce the size and to save on the cost of the components. Two voltage regulator 1.8 and 3.3 allow fuel microcontrollers and wireless receiver-transmitters. Technology tracking the maximum power point (MPPT) continuously optimizes the collection of energy and, if necessary, can be turned off. Integrated charge controller supports a wide range of battery types: Li-Ion, Li-Pol, LiCoO, NiMH and NiCd, as well as electric double layer capacitors. The cost of the chip is not high and amounts to $ 1 for orders of 1000 pieces.

Specifications:
Input voltage range from 75 mV to 18 V; The current battery charge 70 mA; Integrated DC \ DC converter; Programmable : MPPT; The upper limit of the battery charge voltage: 2.6 - 5.3; The lower limit of the battery discharge voltage: 2.2 - 3.6; Two fully independent LDOs 1.8 and 3.3V; Operating temperature range: -40 to 125 degrees Celsius; The current consumption in standby mode: 1 mA; The current consumption of worker from 5 to 30 mA (depending on the mode of DC \ DC converter, a step-down or step-up). datasheet SPV1050

Evaluation Boards
First STEVAL-ISV019V1


The board has only the controller and the necessary piping. Datasheet STEVAL-ISV019V1

The second development board STEVAL-IDS002V1


This card contains everything you need to start developing wireless solutions. It is already mounted controller, solar cell, microprocessor and radio. Datasheet STEVAL-IDS002V1

We look forward to receipt of evaluation boards, components and circuit boards ready for testing.
To be continued.

Author and developer: Chuyanov Vladimir.

Developer PCB: Sargsyan Andrew.

Source: geektimes.ru/post/251332/