Apparatus for maintaining a low power loss within an input...

Details Apparatus for maintaining a low power loss within an input... Apparatus for maintaining a low power loss within an input...

H - Electricity

03

K

H03K 19/0175 (2006.01) G05B 19/05 (2006.01) G05F 1/618 (2006.01) H03H 11/52 (2006.01)

Patent

CA 2074573

20365-3196 ABSTRACT OF THE DISCLOSURE An input stage for programmable controllers in which a Schmitt trigger and a two-terminal configuration having a negative resistance characteristic are combined in an integrated circuit. A first resistor supplementing this bipolar configura- tion to form a constant-current sink is connected externally of the integrated circuit in parallel with the bipolar configuration. A power loss mainly develops in the first resistor which is external of the integrated circuit so that multi-channel input stages are able to be realized cost-effectively without requiring a supply of cooling air to cool the integrated circuit. A second resistor may be connected external of the integrated circuit in series with the two-terminal configuration to further reduce power loss within the integrated circuit and to limit the current flowing into the integrated circuit.

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