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Title: Battery charger and state of charge indicator. Final report

Abstract

The battery charger has a full-wave rectifier in series with a transformer isolated 20 kHz dc-dc converter with high frequency switches which are programmed to actively shape the input ac line current to be a mirror image of the ac line voltage. The power circuit is capable of operating at 2 kW peak and 1 kW average power. The BC/SCI has two major subsystems: (1) the battery charger power electronics with its controls; and (2) a microcomputer subsystem which is used to acquire battery terminal data and exercise the state-of-charge software programs. The state-of-charge definition employed is the energy remaining in the battery when extracted at a 10 kW rate divided by the energy capacity of a fully charged new battery. The battery charger circuit is an isolated boost converter operating at an internal frequency of 20 kHz. The switches selected for the battery charger are the single most important item in determining its efficiency. The combination of voltage and current requirements dictated the use of high power NPN Darlington switching transistors. The power circuit topology developed is a three switch design utilizing a power FET on the center tap of the isolation transformer and the power Darlingtons on eachmore » of the two ends. An analog control system is employed to accomplish active input current waveshaping as well as the necessary regulation.« less

Authors:
Publication Date:
Research Org.:
Gould, Inc., Rolling Meadows, IL (USA). Electronics Lab.
OSTI Identifier:
7029476
Report Number(s):
DOE/CS/54209-16
ON: DE84014614
DOE Contract Number:  
AI01-78CS54209
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions are illegible in microfiche products. Original copy available until stock is exhausted
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; BATTERY CHARGERS; CONTROL SYSTEMS; MONITORS; CHARGE STATE; INDICATORS; BATTERY CHARGING; MICROPROCESSORS; RECTIFIERS; SWITCHES; SWITCHING CIRCUITS; COMPUTERS; ELECTRICAL EQUIPMENT; ELECTRONIC CIRCUITS; EQUIPMENT; MEASURING INSTRUMENTS; MICROELECTRONIC CIRCUITS; 250903* - Energy Storage- Batteries- Materials, Components, & Auxiliaries

Citation Formats

Latos, T. S. Battery charger and state of charge indicator. Final report. United States: N. p., 1984. Web. doi:10.2172/7029476.
Latos, T. S. Battery charger and state of charge indicator. Final report. United States. https://doi.org/10.2172/7029476
Latos, T. S. 1984. "Battery charger and state of charge indicator. Final report". United States. https://doi.org/10.2172/7029476. https://www.osti.gov/servlets/purl/7029476.
@article{osti_7029476,
title = {Battery charger and state of charge indicator. Final report},
author = {Latos, T. S.},
abstractNote = {The battery charger has a full-wave rectifier in series with a transformer isolated 20 kHz dc-dc converter with high frequency switches which are programmed to actively shape the input ac line current to be a mirror image of the ac line voltage. The power circuit is capable of operating at 2 kW peak and 1 kW average power. The BC/SCI has two major subsystems: (1) the battery charger power electronics with its controls; and (2) a microcomputer subsystem which is used to acquire battery terminal data and exercise the state-of-charge software programs. The state-of-charge definition employed is the energy remaining in the battery when extracted at a 10 kW rate divided by the energy capacity of a fully charged new battery. The battery charger circuit is an isolated boost converter operating at an internal frequency of 20 kHz. The switches selected for the battery charger are the single most important item in determining its efficiency. The combination of voltage and current requirements dictated the use of high power NPN Darlington switching transistors. The power circuit topology developed is a three switch design utilizing a power FET on the center tap of the isolation transformer and the power Darlingtons on each of the two ends. An analog control system is employed to accomplish active input current waveshaping as well as the necessary regulation.},
doi = {10.2172/7029476},
url = {https://www.osti.gov/biblio/7029476}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Apr 15 00:00:00 EST 1984},
month = {Sun Apr 15 00:00:00 EST 1984}
}