Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1992-02-26
1994-07-19
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340641, 340642, 340458, 307 108, G08B 2100
Patent
active
053313143
ABSTRACT:
A circuit is described for monitoring of loads having measuring resistors in the load circuit. The circuit evaluates the measuring voltage drops obtained at the measuring resistors. The circuit comprises at least one comparator stage made up of a reference current section and a comparator section. A temperature-dependent reference current is formed in the reference current section and supplied to the comparator section, with the temperature-dependent reference current comprising a voltage-independent component and a voltage-dependent component. The comparator section comprises one or more input branches, corresponding comparator branches, and a reference branch. The comparator branch compares the reference current flowing in the reference branch with the input currents flowing in the input branches and representing a measure for the measuring voltage drops obtained at the measuring resistors and applied to the inputs of the comparator stages. Depending on this comparison, a certain voltage level is emitted at the outputs of the comparator stages.
REFERENCES:
patent: 4173750 (1979-11-01), Riba
U. Lachmann et al.: "Lampenuberwachung im Kraftfahrzeug" in Elektronik 23/Nov. 11, 1988, pp. 125-130.
M. Meakin: "Vielseitiger Komparator fur Automobilanwendungen" in Elektronik 11/May 27, 1988, pp. 111-113.
Hofsass Jeffery A.
TEMIC Telefunken microelectronic GmbH
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