skyglin
Junior Member level 2
74hc14 circuits
I'm building a H-Bridge to control the operation of a DC brush motor, this works fine except that the transistors get very hot immediately after the circuit powers up. The power consumption of this circuit is very large as I have tested in PSPICE. After spending some time searching the web for a solution, on one website, I found Steve Bolt's 4-transistor H-bridge, and it has a 74HC14 inverter on each of the control input. So I add the inverters to my circuit and connected between the pull-up resistor and the controlling input, tested using PSPICE, amazingly, the power consumption dropped dramatically. [/img]
Why is the addition of 74HC14 solve the power problem? Is it because the pull-up resistor can influence the h-bridge without the inverters? but how?
Can someone help me on this?
*A schematic for the H-Bridge without the 74HC14 is attached
I'm building a H-Bridge to control the operation of a DC brush motor, this works fine except that the transistors get very hot immediately after the circuit powers up. The power consumption of this circuit is very large as I have tested in PSPICE. After spending some time searching the web for a solution, on one website, I found Steve Bolt's 4-transistor H-bridge, and it has a 74HC14 inverter on each of the control input. So I add the inverters to my circuit and connected between the pull-up resistor and the controlling input, tested using PSPICE, amazingly, the power consumption dropped dramatically. [/img]
Why is the addition of 74HC14 solve the power problem? Is it because the pull-up resistor can influence the h-bridge without the inverters? but how?
Can someone help me on this?
*A schematic for the H-Bridge without the 74HC14 is attached