Operation
The H-bridge arrangement is generally used to reverse the polarity of the motor, but can also be used to 'brake' the motor, where the motor comes to a sudden stop, as the motor's terminals are shorted, or to let the motor 'free run' to a stop, as the motor is effectively disconnected from the circuit. The following table summarises operation, with S1-S4 corresponding to the diagram above.
| S1 | S2 | S3 | S4 | Result |
|---|---|---|---|---|
| 1 | 0 | 0 | 1 | Motor moves right |
| 0 | 1 | 1 | 0 | Motor moves left |
| 0 | 0 | 0 | 0 | Motor free runs |
| 0 | 1 | 0 | 1 | Motor brakes |
| 1 | 0 | 1 | 0 | Motor brakes |
| 1 | 1 | 0 | 0 | Shoot-through |
| 0 | 0 | 1 | 1 | Shoot-through |
| 1 | 1 | 1 | 1 | Shoot-through |
Read more about this topic: H Bridge
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