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Open AccessArticle

Composite Sinusoidal Waveform Generated by Direct Digital Synthesis for Healthy Charging of Lithium-ion Batteries

1
Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
2
Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan
3
Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, 10608, Taiwan
4
Department of Vehicle Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
5
Department of Mechanical Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan
*
Authors to whom correspondence should be addressed.
These authors contributed equally.
Energies 2020, 13(4), 814; https://doi.org/10.3390/en13040814
Received: 10 January 2020 / Revised: 2 February 2020 / Accepted: 12 February 2020 / Published: 13 February 2020
(This article belongs to the Section Energy Storage and Application)
To address the defects in lithium-ion battery lifespan, this paper proposes a composite waveform generation strategy that offers capacity-recovering effect. Based on digital architecture, this study exploits direct digital synthesis (DDS) to generate data, which are then processed in an analog-to-digital converter to produce a predefined voltage waveform signal. In the process, an arbitrary waveform is converted to digital voltage waveform signal through pulse width modulation (PWM) technology, thus realizing waveform generation through DDS. Subsequently, analog-to-digital conversion is accomplished by going through a buck circuit, resulting in a composite sinusoidal waveform that is used to charge the battery with a recovering effect. This paper comprises an introduction of effective waveforms for capacity recovering, methods of generating composite sinusoidal waveforms, and an example of the application of composite sinusoidal waveform generation. The waveform produced by the circuit may recover the capacity of an aged 18650 lithium-ion battery by about 8%.
Keywords: composite sinusoidal waveform charging; direct digital synthesis; pulse width modulation; lithium-ion battery composite sinusoidal waveform charging; direct digital synthesis; pulse width modulation; lithium-ion battery
MDPI and ACS Style

Chen, P.-T.; Tseng, F.-Y.; Zhang, X.-H.; Chung, R.-J.; Yang, C.-J.; Huang, K.D. Composite Sinusoidal Waveform Generated by Direct Digital Synthesis for Healthy Charging of Lithium-ion Batteries. Energies 2020, 13, 814.

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