Control strategy for pulsed lead acid battery charger for stand alone photovoltaics

The purpose of this research: (1) To investigate battery temperature during charging using battery charger and electrolyte weight reduction in Yuasa lead acid battery 12V 5Ah liquid vented type before giving battery life extender technology (Vitta-Q battery vitamin). (2) To investigate battery temperature during charging using battery charger and electrolyte weight reduction in Yuasa lead acid battery 12V 5Ah liquid vented type after giving Vitta-Q battery vitamin. This research was used experimental method. The experiment was conducted at the Laboratory of Automotive Mechanical Engineering Education Program, the Laboratory of Mechanical Civil Education Program, JPTK FKIP UNS Surakarta and the Laboratory of Mathematics and Natural Sciences FMIPA UNS Surakarta which addressed at Ahmad Yani 200 Kartasura. The instruments which used to test were Delta DT.115K battery charger, Mettler Toledo digital balance, and Perkin Elmer UV/VIS Spectrometer. The research population were Yuasa 12V 5Ah battery with code number YB5L-B and the research sample were 6 Yuasa 12V 5Ah batteries with code number YB5L-B with lifetime of approximately 2 years or 20.000 miles. The comparative study descriptive investigation methode was used to analyse the data. Based on this research can be concluded: (1) The measurement on Yuasa lead acid battery 12V 5Ah liquid vented type before giving Vitta-Q battery vitamin during charging using battery charger resulted the temperature 49 oC and weight of electrolyte 209.5 gr in 230.0 gr electrolytes. (2) The measurement on Yuasa lead acid battery 12V 5Ah liquid vented type after giving 2 ml of Vitta - Q battery vitamin per cell during charging using battery charger resulted the lowest temperature 40.3 oC and weight of electrolyte 216.4 gr in 230.0 gr electrolytes. (3) The measurement on Yuasa lead acid battery 12V 5Ah liquid vented type after giving 3.5 ml of Vitta - Q battery vitamin per cell during charging using battery charger resulted the highest temperature 49.8 oC and weight of electrolyte 208.1 gr in 230.0 gr electrolytes

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Buck Converter Control for Lead Acid Battery Charger using Peak Current Mode

International Journal of Power Electronics and Drive Systems (IJPEDS) ◽

10.11591/ijpeds.v8.i2.pp686-694 ◽

2017 ◽

Vol 8 (2) ◽

pp. 686

Author(s):

Asep Nugroho ◽

Estiko Rijanto ◽

Latif Rozaqi

Keyword(s):

Control System ◽

Output Voltage ◽

Buck Converter ◽

Control Mode ◽

Lead Acid Battery ◽

Battery Charger ◽

Peak Current ◽

Nominal Model ◽

Load Variation ◽

Lead Acid

DC-DC buck converters are used for battery chargers in many applications including renewable energy sources, inverters, electric vehicles and robots. In this paper a buck converter was built and its controller was developed using peak current control mode for current loop and phase lag for voltage loop. This paper proposes a formulation of plant disturbance due to load variation to obtain a nominal model based on small signal approach. The controller was derived analytically based on the nominal model. Experiment results show that the buck control system functions well in regulating the output voltage. During the start up without any load it can reduce input voltage from 300 V to output voltage of 133.9 V in 19.3 ms. The developed controller can maintain the output voltage under load variation from no load to sudden load of 0.26 A. When it was implemented to charge a lead acid battery string, constant current of 3.36 A was charged in the first 173 minutes followed by constant voltage of 134.7 V until the end of charging at time 483 minutes. Thus, the developed control system of lead acid battery charger works well.

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