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Title: Current regulating circuit

Abstract

A battery charger which includes terminals for connection to an electric power source, an electrical charging circuit and an operative arrangement for connecting at least one rechargeable battery cell, in series with the charging circuit across the terminals. The battery charger has a charging circuit which includes a first resistor, a second resistor, a third resistor and a rectifier, constituted by at least one diode, in series. A first transistor, which has a collector-emitter path and a base-emitter path, is operatively connected so that the base-emitter path is connected in parallel with the first resistor. A fourth resistor is provided, the fourth resistor being connected in series with the collector-emitter path of the transistor and the third resistor. A plurality of additional transistors, connected in Darlington configuration, includes a second transistor and a final transistor, each of the additional transistors having its collector connected to a circuit point between the third resistor and an electrode of the diode. The first transistor and the last transistor have their emitters connected via a current-limiting PTC fifth resistor which may act as a fuse. The first transistor and the second transistor have their respective collector and base conductively connected. The connection of themore » third resistor provides internal feedback. The fifth resistor, when in series with the first resistor in the base-emitter circuit, provides external feedback.« less

Inventors:
Publication Date:
OSTI Identifier:
5420327
Patent Number(s):
US 4504774
Application Number:
TRN: 85-019290
Assignee:
Solid State Chargers Research and Development Limited Partnership
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 7 Mar 1983; Other Information: PAT-APPL-472758
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; BATTERY CHARGERS; CONFIGURATION; ELECTRODES; ELECTRONIC CIRCUITS; RECTIFIERS; RESISTORS; SEMICONDUCTOR DIODES; TRANSISTORS; ELECTRICAL EQUIPMENT; EQUIPMENT; SEMICONDUCTOR DEVICES; 420800* - Engineering- Electronic Circuits & Devices- (-1989)

Citation Formats

Hoffman, Ph A. Current regulating circuit. United States: N. p., 1985. Web.
Hoffman, Ph A. Current regulating circuit. United States.
Hoffman, Ph A. Tue . "Current regulating circuit". United States.
@article{osti_5420327,
title = {Current regulating circuit},
author = {Hoffman, Ph A},
abstractNote = {A battery charger which includes terminals for connection to an electric power source, an electrical charging circuit and an operative arrangement for connecting at least one rechargeable battery cell, in series with the charging circuit across the terminals. The battery charger has a charging circuit which includes a first resistor, a second resistor, a third resistor and a rectifier, constituted by at least one diode, in series. A first transistor, which has a collector-emitter path and a base-emitter path, is operatively connected so that the base-emitter path is connected in parallel with the first resistor. A fourth resistor is provided, the fourth resistor being connected in series with the collector-emitter path of the transistor and the third resistor. A plurality of additional transistors, connected in Darlington configuration, includes a second transistor and a final transistor, each of the additional transistors having its collector connected to a circuit point between the third resistor and an electrode of the diode. The first transistor and the last transistor have their emitters connected via a current-limiting PTC fifth resistor which may act as a fuse. The first transistor and the second transistor have their respective collector and base conductively connected. The connection of the third resistor provides internal feedback. The fifth resistor, when in series with the first resistor in the base-emitter circuit, provides external feedback.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {3}
}