NDLI: An Actuator Control Unit for Safety-Critical Mechatronic Applications with Embedded Energy Storage Backup

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An Actuator Control Unit for Safety-Critical Mechatronic Applications with Embedded Energy Storage Backup

Content Provider	MDPI
Author	Saponara, Sergio
Abstract	This paper presents an actuator control unit (ACU) with a 450-J embedded energy storage backup to face safety critical mechatronic applications. The idea is to ensure full operation of electric actuators, even in the case of battery failure, by using supercapacitors as a local energy tank. Thanks to integrated switching converter circuitry, the supercapacitors provide the required voltage and current levels for the required time to guarantee actuator operation until the system enters into safety mode. Experimental results are presented for a target application related to the control of servomotors for a robotized prosthetic arm. Mechatronic devices for rehabilitation or assisted living of injured and/or elderly people are available today. In most cases, they are battery powered with lithium-based cells, providing high energy density and low weight, but at the expense of a reduced robustness compared to lead-acid- or nickel-based battery cells. The ACU of this work ensures full operation of the wearable robotized arm, controlled through acceleration and electromyography (EMG) sensor signals, even in the case of battery failure, thanks to the embedded energy backup unit. To prove the configurability and scalability of the proposed solution, experimental results related to the electric actuation of the car door latch and of a robotized gearbox in vehicles are also shown. The reliability of the energy backup device has been assessed in a wide temperature range, from −40 to 130 °C, and in a durability test campaign of more than 10,000 cycles. Achieved results prove the suitability of the proposed approach for ACUs requiring a burst of power of hundreds of watts for only a few seconds in safety-critical applications. Alternatively, the aging and temperature characterizations of energy backup units is limited to supercapacitors of thousands of farads for high power applications (e.g., electric/hybrid propulsion) and with a temperature range limited to 70 °C.
File Size	3179520
File Format	PDF
e-ISSN	19961073
DOI	10.3390/en9030213
Journal	Energies
Issue Number	3
Volume Number	9
Language	English
Publisher Date	2016-03-17
Access Restriction	Open
Subject Keyword	actuator control unit (ACU) energy storage ICT (Information and Communication Technologies) for power systems biomedical robotics mechatronics automotive electric actuators power electronics and components
Content Type	Text
Resource Type	Article

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