High or low-side state relay with current limiting and operation

Details High or low-side state relay with current limiting and operation High or low-side state relay with current limiting and operation

1984-07-11

1986-12-23

Karlsen, Ernest F.

Electricity: measuring and testing

Plural, automatically sequential tests

307584, G01R 3102, H03K 17687

Patent

active

046314741

ABSTRACT:
The switch comprises a circuit from a first output terminal via parallel MOS devices in series with current-sensing resistance to a second output terminal, with alternative high-side and low-side configurations having a load between the second terminal and ground, or the first terminal and the DC supply voltage. An input terminal for a digital control signal is coupled via an input diode and two Schmitt Trigger CMOS inverters to a control lead for the gates of the switch. A current overload or short circuit protection circuit coupled between the current-sensor and the input diode comprises two transistors coupled by a diode. A built-in test circuit for indicating the switch condition (on, off, shorted or open) comprises MOS transistors having their gates connected to voltage dividers at the two output terminals, and their drains connected to discrete indication terminals.

REFERENCES:
patent: 3131314 (1964-04-01), Charlot, Jr.
patent: 3148357 (1964-09-01), Thornton
patent: 3610953 (1971-10-01), Gordon et al.
patent: 3720848 (1973-03-01), Schmidt, Jr.
patent: 3789244 (1974-01-01), Provansano
patent: 3984703 (1976-10-01), Jorgensen
patent: 4095213 (1978-06-01), Hayden
patent: 4188547 (1980-02-01), Fox
patent: 4274014 (1981-06-01), Schade, Jr.
patent: 4420721 (1983-12-01), Dorey et al.

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