Here is a DC motor connected to four driver transistors in an H-Bridge configura

Question

Here is a DC motor connected to four driver transistors in an H-Bridge configuration. Each transistor has a control line (C1 to C4). A logic 1 (5V) on CX turns on transistor QX to saturation and a logic 0 (0V) turns off the transistor. If transistors Q1 and Q3 are ON, and Q2 and Q4 are OFF, then the motor rotates clockwise, if transistors Q2 and Q4 are ON, and Q1 and Q3 are OFF, then the motor rotates counterclockwise Identify and explain a catastrophic failure mode of this motor driver circuit? Design a two input logic circuit to let a microcontroller easily control the motor AND prevent the catastrophic failure modes. Circuit diagram Truth table for circuit Here are the inputs to your circuit Input 1 Motor ON/OFF 1 = Motor ON 0 = Motor OFF Input 2 Direction 1 = Clockwise 0 = Counterclockwise The four outputs of your circuit will control the transistors Q1 - Q4 via the control lines C1 - C4

Explanation / Answer

When mistakely c1 and c4 gets on signal or c2 and c3 gets on signal or all four get on then it may lead to short circuit and the motor gets damage.

Input1 Input2 C1 C2 C3  C4
      1        1     1   0   1   0
      1         0    0    1   0   1
      0          1    0    0   0  0
      0          0     0   0   0  0
C1=(input1)&(input2)
C3-=(input1)&(input2)
c2= (input1)&(complement of input2)
c4 = (input1)&(complement of input2)

& indicates the and gate i.e the output is equal to 1 if both inputs are 1 otherwise 0

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