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Energies 2017, 10(10), 1607;

Power Controllable LED System with Increased Energy Efficiency Using Multi-Sensors for Plant Cultivation

Department of Electronic Engineering, Sogang University, Seoul 04107, Korea
Department of Electrical Engineering, Hanyang University, Seoul 04763, Korea
Author to whom correspondence should be addressed.
Academic Editor: Jianlin Li
Received: 11 September 2017 / Revised: 3 October 2017 / Accepted: 9 October 2017 / Published: 14 October 2017
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In this paper, a power-controllable light emitting diode (LED) control system is proposed for plant cultivation. The proposed LED system measures environmental data, such as the distance between the plant and LED system using an infrared sensor and the ambient illuminance based on an illuminance sensor. Then, it converts the illuminance to the photosynthetic photon flux density (PPFD) for plant cultivation. It analyzes the relationship between the data and LED PPFD, and generates an optimal pulse width modulation (PWM) signal. Therefore, it controls the LED PPFD dynamically. The proposed LED system is also implemented in hardware, which consists of red and blue LED arrays with suitable wavelengths and a micro-controller. In the experimental results, the proposed LED system preserved the target PPFD regardless of the change of the distance and ambient PPFD. Additionally, the proposed LED system maximally reduced the power consumption of a conventional system by up to 68%. View Full-Text
Keywords: light emitting diode (LED); power control; lighting control light emitting diode (LED); power control; lighting control

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Ahn, Y.D.; Bae, S.; Kang, S.-J. Power Controllable LED System with Increased Energy Efficiency Using Multi-Sensors for Plant Cultivation. Energies 2017, 10, 1607.

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