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How should an H bridge circuit be analyzed?

  • #1

Homework Statement:

How should an H bridge circuit be analyzed?

Relevant Equations:

Basic KCL, KVL, transistor equations
If I am given an H bridge circuit such as that below:
1577067105797.png


How would I go on analyzing it? I would personally replace all of the transistors by their circuit models but then what would I do with the motor? Do I replace the motor with it's load resistance or is there more to it? I guess motors are dealt with power electronics, I have not covered power electronics in my study (i dont plan on doing so).
 

Answers and Replies

  • #2
493
196
Typically motors are simulated as series RL circuit. It allows accurate sumulation of transients during motor switching.
 
  • #3
Typically motors are simulated as series RL circuit. It allows accurate sumulation of transients during motor switching.
if i have a motor with me is there a way to determine those values?
 
  • #4
493
196
if i have a motor with me is there a way to determine those values?
High end multimeters allows to measure both inductance and resistance of motor winding.
In my workshop, i prefer to use a combination of cheap multimeter for resistance measurement and a dedicated LC meter for measurement of inductance though - more cost efficient and accurate. Standard meter-long multimeter leads have enough self-inductance to distort reading from smaller motors.
 
  • #5
High end multimeters allows to measure both inductance and resistance of motor winding.
In my workshop, i prefer to use a combination of cheap multimeter for resistance measurement and a dedicated LC meter for measurement of inductance though - more cost efficient and accurate. Standard meter-long multimeter leads have enough self-inductance to distort reading from smaller motors.

Darn, my multimeter doesn't include that operation. I was wondering if I could analyze this hbridge by hand calculation or if I should just use a SPICE program because it will be too complicated by hand?
 
  • #6
493
196
Darn, my multimeter doesn't include that operation. I was wondering if I could analyze this hbridge by hand calculation or if I should just use a SPICE program because it will be too complicated by hand?
Voltage surges which are dominant problem of H bridges are difficult to calculate manually; SPICE is preferrable.
 

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