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Electric power harvester



Considerable interest in the article “Can an ionistor replace a battery?” Led to the advancement of further research and developments on the topic of autonomous power sources using energy collection and storage controllers.

At the end of the article, the idea of ​​modernizing the design that participated in the experiments is briefly displayed, and the sketch in pencil is shown.
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For the new design, a printed circuit board was developed, the design of which is designed in such a way that several configurations can be built on it, which will be discussed in this and the following articles. An SPV1050 controller has been added to drive the drive.

For a more detailed analysis of the operation of the SPV1050 controller, debugging boards STEVAL-ISV019V1 and STEVAL-IDS002V1 from STMicroelectronics were ordered.
The developed energy storage device consists of a solar cell, an energy collection and charge controller SPV1050, an ionistor or a battery.

Configurations of the developed energy storage:
1. Photocell, controller, ionistor;


2. Photocell, controller, Ni-MH battery;


Board dimensions: 85 x 55 x 8 (12) mm

Ionistors Panasonic EECS5R5H105


Specifications:


Batteries Eneloop Pro

For the experiments, 4 AAA Eneloop Pro batteries with a capacity of 900 mA each were chosen. The choice of this brand of battery is due to fairly good characteristics: the ability to work at low temperatures up to -20 ° C with high current output, low self-discharge - 15% per year of storage and no memory effect.

Specifications:


Briefly about the controller SPV1050

SPV1050 is a new controller for collecting environmental energy from STMicroelectronics. High-performance micro-consuming environmental energy collector with a charger and two voltage regulators in one package simplifies the design and expands the capabilities of small-sized stand-alone devices.
The controller collects the energy of light or heat to power small-sized electronic devices, which include wireless sensors, industrial equipment, controllers and smart home sensors, wearable devices, creating opportunities for the world of the Internet of things.

Why was this controller chosen?
In comparison with analogues, the SPV1050 chip has more functions, a rather high efficiency of about 90% and small dimensions. The minimum number of elements of the strapping allows you to reduce the size and save on the cost of components. Two voltage regulators 1.8 and 3.3 V can power microcontrollers and wireless transceivers. Maximum Power Point Tracking (MPPT) technology continuously optimizes energy collection and can be turned off if necessary. The built-in charge controller supports a wide range of battery types: Li-Ion, Li-Pol, LiCoO, NiMH and NiCd, as well as ionistors. The cost of the microcircuit is not high and amounts to 1 dollar when ordering from 1000 pcs.

Specifications:

Detailed specifications can be found in the datasheet SPV1050

Debug boards
First STEVAL-ISV019V1

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

And the second debug board STEVAL-IDS002V1

This board contains everything you need to start developing wireless solutions. It already has a controller, solar cell, microprocessor and radio module. Datasheet STEVAL-IDS002V1

We are waiting for the arrival of debug boards, components and readiness of printed circuit boards for testing.
To be continued.

Author and developer: Chuyanov Vladimir.

PCB Developer: Andrey Sarkisyan.

Source: https://habr.com/ru/post/367257/

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