Avoid the reverse polarity input voltage. It will break the power supply. It is possible to protect the unit from the reverse input voltage by assembling the external diode. Please refer to the following.
Fig. 1.1 Example of reverse input voltage protection circuit vol.1
Fig. 1.2 Example of reverse input voltage protection circuit vol.2
Fig. 1.3 Example of reverse input voltage protection circuit vol.3
| Fig.# | Operation during applied reverse polarity voltage | Advantage | Disadvantage | Cost |
|---|---|---|---|---|
| 1.1 | Normal operation | * Normal output * No component required for reocovery |
* Not detectable reverse connection * Diode power loss constantly |
High |
| 1.2 | No output | * Detectable of reverse connection * No component required for reocovery |
* No output after reverse connection * Diode power Loss constantly |
Low |
| 1.3 | No output Fuse open |
* Detectable reverse connection * No diode power loss |
* Fuse replacement required for recovery * Overcurrent for an instant |
Medium |
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