h bridge


Posted on Feb 5, 2014

This was used on a Linear actuator for a variable geometry turbine used for more power to compensate for all the armor they started putting on HumVees. I forget the current rating, where ARE my old design notebooks ! The four darlingtons are the driver transistors, the other ones are for two input control and to make sure both sides don`t engage ath ehe same tsending VCC to GROUND.


h bridge
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The top one won`t work unless you use high side drivers for the top. your top gate voltage has to go above the collector voltage to turn the transistor on into saturation. The top one won`t work unless you use high side drivers for the top. your top gate voltage has to go above the collector voltage to turn the transistor on into saturation. the top SCHEMATIC will not work. they may turn on, but if you don`t put it into saturation, all voltage dropped across the transistor will be dissipated as heat and it will burn up did you see my H bridge schematic. I added two more transistors to ensure both sides don`t come on at the same time. how can we do that to *your* modified circuit moonstreat, that`s why electrical engineers are MATH MAJORS. you picked the `scheme`. Look at your schematic number 2 (bottom one). see the motor in the middle If you attach 12V to the pin at the top (circle), and turn on one channel, it will deliver +12V to the motor. The polarity of the +12V depends on which channel you turn on. On channel delivers +12V to motor + and ground to motor -, causing it to go forward. The other channel does the opposite. delivers +12V to motor - and ground to motor +, causing it to go in the reverse direction. Whether or not the circuit burns up depends on how much power it has to dissipate which depends on how big the motor is. Dissipating power causes heat, or more specifically, a temperature rise above ambient. So...




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