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Motor Control Circuit of LM339

2016-09-04 20:48  
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Motor Control Circuit of LM339
The above picture is the motor control circuit composed of LM339 etc.When the input control signal is high PWL,comparator A and A3 make power amplifier conduct composed of A4,VT5 and VT6 and it drives motor M.At the same time,comparator also outputs and removes the armature current integral capacitance C1 reset.The armature current monitors the current enters C1 through A5 and VT3.When RP2 adjustable proportional is constant, the current that enters C1 ,R2 Cl and R3 resistance test armature currentare in proportion.As long as comparator compares the voltage on C1 with RP1 setting voltage,A6 will output high PWL as long as voltage on C1 is lower than RP1 setting voltage.