Information handling and control systems, and methods of testing

Details Information handling and control systems, and methods of testing Information handling and control systems, and methods of testing

1988-09-06

1990-01-16

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340825070, 340825170, 340635, 324537, 370112, H04Q 900

Patent

active

048946486

ABSTRACT:
In a multiplex system for automotive vehicles, battery (+V) current is supplied to each load (70, 71) connected to a non-intelligent slave unit (20) via a power switch (TR) in the slave controlled by a capacitor (CT) which is charged or discharged in an assigned time slot by high or low voltage (A,C) applied on a low current signal line from a remote intelligent unit (10). If a load (70, 71) goes open-circuit then a voltage source (TR1, Z1) in the slave provides low current via a resistor (R2, R3) and the forward direction of a zener diode Z to charge the capacitor CT to an intermediate voltage which is detected at the remote intelligent unit (10) during an assigned load driving time slot. If a load (70, 71) goes short circuit then a thyristor (TH) in thermal contact with its power switch (TR) turns on to turn off the power switch (TR) and provide a discharge path for the capacitor (CT) via the load (70, 71), this discharged condition being detected at the remote intelligent unit during an assigned load driving time slot. This dedicated extra channels (time slots) are not required at the slave unit for open-circuit or short-circuit load testing.

REFERENCES:
patent: 3599179 (1971-08-01), Arnold
patent: 4206443 (1980-06-01), Britton
patent: 4538106 (1985-08-01), Anderson
patent: 4574266 (1986-03-01), Valentine
patent: 4817040 (1989-03-01), Bodley-Scott
Jorgenson et al., "Early AC Line Failure Detection for Power Supplies", 9/83, IBM Tech Disclosure vol. 26, No. 4, 1893.
Carroll, "Distribution Network Simulator for Testing Power Supplies," 9/83, IBM Technical Disclosure Bulletin, vol.26, No. 4, 1954.

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