(631) 271-0400 (631) 271-0405 Computer Systems, Inc. 1235 Walt Wh

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(631) 271-0400 (631) 271-0405 Computer Systems, Inc. 1235 Walt Wh

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CATI NOTE
(631) 271-0400 (631) 271-0405
Computer Systems, Inc. 1235 Walt Whitman Road, Melville, 11747
A3800
HEAVY DUTY POWER CONTROL WITH AUTOMATIC VARIABLE TIMED OPERATION OVERLOAD SHUTDOWN
method described herein simple electronic control large current inductive loads such motors heavy duty appliances. control provides manual selects well automatic timed operation overload shutdown. circuit shown Figure uses LS7339 drive large current inductive load. large current required load provided triac network. output applied triac which current triac. output current used trigger triac which delivers required load current. size triac supply currents 300A more desired. Triacs delivering 300A need 500mA gate current. Triac need only rated this case. Resistors used provide gate current triac required gate voltage. Since voltage will reach when LS7339 output occurs turns then value ohms ohms will provide gate current 500mA gate voltage 1/4W resistors since immediately shorted when turns circuit shown Figure also includes controls Automatic Variable Timed Operation Overload Shutdown. network consisting megohm potentiometer, 390K resistor .1uF capacitor used achieve
December 1996
timed operation range seconds. Overload Shutdown control uses fractional resistor, which senses output current. current becomes large, voltage across fractional resistor increases. This converted using half wave rectifier applied LM311 comparator. Resistors used adjust comparator trip level thereby current level which Overload Shutdown occurs. CMOS gate, such CD4001, used combine comparator output with Momentary Control. Overload Shutdown must blocked during Turn-on because initial surge current through triac could generate false Shutdown signal. network consisting Megohm resistor, .1uF capacitor diode used block false Shutdown when Momentary Switch pressed. diode provides immediate block Network causes block remain short time after Switch released.
information included herein believed accurate reliable. However, Computer Systems, Inc. assumes responsibilities inaccuracies, infringements patent rights others which result from use.
N302-121896-1
NOTE: Indicates resistor
wattage rating higher than 1/4W 100K
IN4003 LM311
100K 4001 4001 4001
Fractional Resistor
100K
100K 4001 IN4003
.68µF LOAD Z=15V IN4003 TRIG LS7339 200µF
.1µF
SYNC 390K
1.5M
.047µF
470pF
.1µF
FIGURE LARGE CURRENT MOTOR CONTROL WITH AUTOMATIC VARIABLE TIMED OPERATION OVERLOAD SHUTDOWN.
AN302-121396-2

(631) 271-0400 (631) 271-0405 Computer Systems, Inc. 1235 Walt Wh

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