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Intrinsically Safe 5-V, 4-A Rechargeable Power Supply.

Authors
Sammarco-JJ
Source
MISSING :11 pages
Link
NIOSHTIC No.
10007051
Abstract
The U.S. Bureau of Mines has developed a regulated, intrinsically safe, rechargeable power supply for portable electronic equipment for underground use. The regulated output is ideal for microprocessor power requirements and is suited for operation in hazardous environments. Two rechargeable, sealed batteries are contained within the power supply. Provisions are made to use an external source of power if these batteries fail. Provisions are also made to charge these internal batteries when needed. The circuit is composed of three main circuits: the main regulator circuit, the input protection circuit, and the output protection circuit. The main regulator circuit provides remote voltage sensing, current sensing, fault monitoring, and internal thermal protection. The input protection circuit checks for excessive input current and low battery conditions. The output protection circuit contains two overvoltage detection devices. Schematics, a parts list, and a calibration procedure are provided to enable readers to fabricate the power supply.
Publication Date
19890101
Document Type
IH; Information Circular;
Fiscal Year
1989
NTIS Accession No.
NTIS Price
Identifying No.
IC 9223
NIOSH Division
PRC;
Source Name
MISSING
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