Efficient Fast Charging Using Simultaneous Search of Optimal Frequency and Optimal Duty Cycle in Pulse Charging Method

2021 ◽  
Author(s):  
Md. Tanvir Hossain ◽  
Saffat Newaz Sadmani ◽  
M Mustafizur Rahman ◽  
Md. Taohidul Haque Emon ◽  
Fariha Shahrin ◽  
...  
Keyword(s):  
Duty Cycle ◽  
Optimal Frequency ◽  
Pulse Charging ◽  
Fast Charging

scholarly journals Design of Rapid Energy-saving Intelligent Fast Charging Device

2016 ◽  
Vol 10 (1) ◽  
pp. 58-68
Author(s):  
Zhang Lefang ◽  
Li Xiaohong ◽  
Ren Zhihong
Keyword(s):  
Energy Saving ◽  
Software Process ◽  
Constant Voltage ◽  
Charging Time ◽  
Pulse Charging ◽  
Fast Charging ◽  
Low Charge

As known that the traditional DC constant voltage charging equipment not only can cause the battery overcharge or insufficient charging, but also the charging time is too long. In the paper, based on the theory of pulse charging method and the design of the pulsed fast intelligent charging equipment is presented, the implementation of hardware and software process of the system is given out, the analysis of the results show that it can effectively prevent overcharge and low charge phenomenon in the charging process of battery.

scholarly journals Improved Performance of Li-ion Polymer Batteries Through Improved Pulse Charging Algorithm

2020 ◽  
Vol 10 (3) ◽  
pp. 895 ◽  
Author(s):  
Judy M. Amanor-Boadu ◽  
Anthony Guiseppi-Elie
Keyword(s):  
Duty Cycle ◽  
Electronic Device ◽  
Lithium Ion ◽  
Cycle Life ◽  
Constant Current ◽  
Battery Charge ◽  
Charge Current ◽  
Pulse Charging ◽  
Pulse Charge ◽  
Improved Performance

Pulse charging of lithium-ion polymer batteries (LiPo), when properly implemented, offers increased battery charge and energy efficiencies and improved safety for electronic device consumers. Investigations of the combined impact of pulse charge duty cycle and frequency of the pulse charge current on the performance of lithium-ion polymer (LiPo) batteries used the Taguchi orthogonal arrays (OA) to identify optimal and robust pulse charging parameters that maximize battery charge and energy efficiencies while decreasing charge time. These were confirmed by direct comparison with the commonly applied benchmark constant current-constant voltage (CC–CV) charging method. The operation of a pulse charger using identified optimal parameters resulted in charge time reduction by 49% and increased charge and energy efficiencies of 2% and 12% respectively. Furthermore, when pulse charge current factors, such as frequency and duty cycle were considered, it was found that the duty cycle of the pulse charge current had the most impact on the cycle life of the LiPo battery and that the cycle life could be increased by as much as 100 cycles. Finally, the charging temperature was found to have the most statistically significant impact on the temporarily evolving LiPo battery impedance, a measure of its degradation.

A Kind of Intelligent Fast Charger of the Lead Acid Battery Based on MCU

2014 ◽  
Vol 8 (1) ◽  
pp. 229-233
Author(s):  
Lun-qiong Chen ◽  
Bei Li ◽  
Lin Yu
Keyword(s):  
Duty Cycle ◽  
Control Unit ◽  
Constant Current ◽  
Measurement Unit ◽  
Lead Acid Battery ◽  
Pulse Charging ◽  
Discharge Unit ◽  
Constant Current Charging ◽  
Unit Pulse ◽  
Lead Acid

Based on pulse fast charge of the lead acid battery, this paper designed a kind of intelligent battery charger, including mainly a minimum system of 16 bit MCU as intelligent center, the constant resistance discharge unit to complete SOC prediction and duty cycle of the pulse charging waveform, the voltage-current-temperature measurement unit, pulse charging control unit. The duty cycle of this charger agreed with SOC of the battery, then using short floating charge in the later stage, thus greatly optimizing the pulse charging mode. Finally, compared with the conventional constant voltage and constant current charging, the charger greatly reduced the charging time.

Comparative Evaluation of Fast Charging Systems for the Advanced Electric Vehicles with Pulse Charging & Reflex Charging

2021 ◽  
Author(s):  
Om Pagar ◽  
Mangesh Darekar ◽  
Sunil Gawde ◽  
Jayesh Bhartiy ◽  
Mohan Thakre ◽  
...  
Keyword(s):  
Electric Vehicles ◽  
Comparative Evaluation ◽  
Pulse Charging ◽  
Fast Charging

scholarly journals The Impact of Pulse Charging Parameters on the Life Cycle of Lithium-Ion Polymer Batteries

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 2162 ◽  
Author(s):  
J. Amanor-Boadu ◽  
A. Guiseppi-Elie ◽  
E. Sánchez-Sinencio
Keyword(s):  
Life Cycle ◽  
Duty Cycle ◽  
Lithium Ion ◽  
Cycle Life ◽  
Constant Current ◽  
Charge Current ◽  
Pulse Charging ◽  
Pulse Charge ◽  
Impedance Parameters ◽  
The Impact

The pulse charging algorithm is seen as a promising battery charging technique to satisfy the needs of electronic device consumers to have fast charging and increased battery charge and energy efficiencies. However, to get the benefits of pulse charging, the pulse charge current parameters have to be chosen carefully to ensure optimal battery performance and also extend the life cycle of the battery. The impact of pulse charge current factors on the life cycle and battery characteristics are seldom investigated. This paper seeks to evaluate the impact of pulse charge current factors, such as frequency and duty cycle, on the life cycle and impedance parameters of lithium-ion polymer batteries (LiPo) while using a design of experiments approach, Taguchi orthogonal arrays. The results are compared with the benchmark constant current-constant voltage (CC-CV) charging algorithm and it is observed that by using a pulse charger at optimal parameters, the cycle life of a LiPo battery can be increased by as much as 100 cycles. It is also determined that the duty cycle of the pulse charge current has the most impact on the cycle life of the battery. The battery impedance characteristics were also examined by using non-destructive techniques, such as electrochemical impedance spectroscopy, and it was determined that the ambient temperature at which the battery was charged had the most effect on the battery impedance parameters.

Two-photon excitation microscopy in cellular biophysics

1995 ◽  
Vol 53 ◽  
pp. 62-63
Author(s):  
David W. Piston ◽  
Brian D. Bennett ◽  
Robert G. Summers
Keyword(s):  
Confocal Microscopy ◽  
Laser Beam ◽  
Duty Cycle ◽  
Excited Electronic State ◽  
Input Power ◽  
Two Photon ◽  
Simultaneous Absorption ◽  
Photon Excitation ◽  
Very High ◽  
Two Photon Excitation

Two-photon excitation microscopy (TPEM) provides attractive advantages over confocal microscopy for three-dimensionally resolved fluorescence imaging and photochemistry. Two-photon excitation arises from the simultaneous absorption of two photons in a single quantitized event whose probability is proportional to the square of the instantaneous intensity. For example, two red photons can cause the transition to an excited electronic state normally reached by absorption in the ultraviolet. In practice, two-photon excitation is made possible by the very high local instantaneous intensity provided by a combination of diffraction-limited focusing of a single laser beam in the microscope and the temporal concentration of 100 femtosecond pulses generated by a mode-locked laser. Resultant peak excitation intensities are 106 times greater than the CW intensities used in confocal microscopy, but the pulse duty cycle of 10-5 maintains the average input power on the order of 10 mW, only slightly greater than the power normally used in confocal microscopy.

Acoustic-Reflex Dynamics for Pulsed Signals

1978 ◽  
Vol 21 (2) ◽  
pp. 295-308
Author(s):  
Terry L. Wiley ◽  
Raymond S. Karlovich
Keyword(s):  
Duty Cycle ◽  
Acoustic Impedance ◽  
Normal Hearing ◽  
Broadband Noise ◽  
Threshold Shift ◽  
Temporary Threshold Shift ◽  
Acoustic Reflex ◽  
Stapedius Muscle ◽  
Duty Cycles

Contralateral acoustic-reflex measurements were taken for 10 normal-hearing subjects using a pulsed broadband noise as the reflex-activating signal. Acoustic impedance was measured at selected times during the on (response maximum) and off (response minimum) portions of the pulsed activator over a 2-min interval as a function of activator period and duty cycle. Major findings were that response maxima increased as a function of time for longer duty cycles and that response minima increased as a function of time for all duty cycles. It is hypothesized that these findings are attributable to the recovery characteristics of the stapedius muscle. An explanation of portions of the results from previous temporary threshold shift experiments on the basis of acoustic-reflex dynamics is proposed.

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