Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1992-12-09
1995-07-25
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
307 38, 361189, H01H 900
Patent
active
054367883
ABSTRACT:
An electronic control apparatus (13) switches several electrical load resistances (16), in particular the solenoid valves of a power shift gear, depending on the position of various information switches (19). The electronic control apparatus (13) has a plurality of load lines (17) each leading to a load resistance (16), and a central unit (15) having a plurality of electronic switches (1). Each of the load lines (17) can be connected via an electronic switch (1) to a supply voltage (14). The electronic switches (1) can each be switched by a logical signal and each has an output (5) for a logical status signal. The logical status signal indicates an open load resistance when the switch is open and a short-circuited load resistance when the switch is closed with an open, short-circuited switch (1), the status signal suggests an open load resistance. The electronic control apparatus (13) monitors the position of the information switches (19). Each of the information switches (19) is coupled between an information line (18) and a respective load line (17). The information line (18) is connected to an output terminal (3) of one electronic switch (1). To ascertain the position of the information switches (19), the information line connected electronic switch (1) is closed and each of the electronic switches (1) connected to a load line is opened. A load line information switches (1) having an open information switch (19) coupled to its load line (17) will generate a logic high signal at its switch status output (5) while a load line information switch (1) having a closed information switch (19) coupled to its load line (17) will generate a logic low signal at its switch status output (5).
REFERENCES:
patent: 4418333 (1983-11-01), Schwarzbach et al.
patent: 4608561 (1986-08-01), Kojima et al.
patent: 5006724 (1991-04-01), Liu
Siemens Publication "Smart SIPMOF Intelligent Power Switch", 1988.
Clark Equipment Company
Gaffin Jeffrey A.
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