| Electronics > Projects, Designs, and Technical Stuff |
| Drving a SPDT 2 coil latching relay |
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| SiliconWizard:
--- Quote from: Arjunan M R on June 17, 2019, 01:00:49 pm ---Does this mean that I can only energize the coil for max. of 10 ms :o. --- End quote --- No, as I get it, this is purely about the contacts themselves. I understand it as the max time from fully open to fully close and vice versa. |
| Zero999:
--- Quote from: Arjunan M R on June 17, 2019, 12:54:22 pm --- --- Quote from: Zero999 on June 17, 2019, 12:50:15 pm --- --- Quote from: Arjunan M R on June 17, 2019, 12:31:16 pm ---Does i need to care about back EMF in this relay? --- End quote --- Yes, back-EMF protection diodes will be required, as the datasheet doesn't say they're built-in. --- End quote --- Do i need to use a schotky diode? If so will this be enough? Here is the datasheet. --- End quote --- That diode is more than adequate. It doesn't need to be Schottky. Ordinary silicon will do and it doesn't even need to be rated to the full coil current, as it only carries a short pulse, when the coil current is interrupted. The only requirement is the reverse voltage exceeds the power supply voltage. |
| Arjunan M R:
--- Quote from: Zero999 on June 17, 2019, 01:47:56 pm --- --- Quote from: Arjunan M R on June 17, 2019, 12:54:22 pm --- --- Quote from: Zero999 on June 17, 2019, 12:50:15 pm --- --- Quote from: Arjunan M R on June 17, 2019, 12:31:16 pm ---Does i need to care about back EMF in this relay? --- End quote --- Yes, back-EMF protection diodes will be required, as the datasheet doesn't say they're built-in. --- End quote --- Do i need to use a schotky diode? If so will this be enough? Here is the datasheet. --- End quote --- That diode is more than adequate. It doesn't need to be Schottky. Ordinary silicon will do and it doesn't even need to be rated to the full coil current, as it only carries a short pulse, when the coil current is interrupted. The only requirement is the reverse voltage exceeds the power supply voltage. --- End quote --- Is ther any disadvantage using Schottky. I am already using that diode in the PSU. It will be good if I can get away with it. |
| Zero999:
--- Quote from: Arjunan M R on June 17, 2019, 03:30:16 pm --- --- Quote from: Zero999 on June 17, 2019, 01:47:56 pm --- --- Quote from: Arjunan M R on June 17, 2019, 12:54:22 pm --- --- Quote from: Zero999 on June 17, 2019, 12:50:15 pm --- --- Quote from: Arjunan M R on June 17, 2019, 12:31:16 pm ---Does i need to care about back EMF in this relay? --- End quote --- Yes, back-EMF protection diodes will be required, as the datasheet doesn't say they're built-in. --- End quote --- Do i need to use a schotky diode? If so will this be enough? Here is the datasheet. --- End quote --- That diode is more than adequate. It doesn't need to be Schottky. Ordinary silicon will do and it doesn't even need to be rated to the full coil current, as it only carries a short pulse, when the coil current is interrupted. The only requirement is the reverse voltage exceeds the power supply voltage. --- End quote --- Is ther any disadvantage using Schottky. I am already using that diode in the PSU. It will be good if I can get away with it. --- End quote --- There is no disadvantage of using a Schottky diode. All the diode does is provide a path for the current to keep flowing, when the coil is de-energised. That diode is perfectly adequate and if you can cut down on the BoM cost by using the same part, then good. |
| Arjunan M R:
--- Quote from: Zero999 on June 17, 2019, 03:38:09 pm --- --- Quote from: Arjunan M R on June 17, 2019, 03:30:16 pm --- --- Quote from: Zero999 on June 17, 2019, 01:47:56 pm --- --- Quote from: Arjunan M R on June 17, 2019, 12:54:22 pm --- --- Quote from: Zero999 on June 17, 2019, 12:50:15 pm --- --- Quote from: Arjunan M R on June 17, 2019, 12:31:16 pm ---Does i need to care about back EMF in this relay? --- End quote --- Yes, back-EMF protection diodes will be required, as the datasheet doesn't say they're built-in. --- End quote --- Do i need to use a schotky diode? If so will this be enough? Here is the datasheet. --- End quote --- That diode is more than adequate. It doesn't need to be Schottky. Ordinary silicon will do and it doesn't even need to be rated to the full coil current, as it only carries a short pulse, when the coil current is interrupted. The only requirement is the reverse voltage exceeds the power supply voltage. --- End quote --- Is ther any disadvantage using Schottky. I am already using that diode in the PSU. It will be good if I can get away with it. --- End quote --- There is no disadvantage of using a Schottky diode. All the diode does is provide a path for the current to keep flowing, when the coil is de-energised. That diode is perfectly adequate and if you can cut down on the BoM cost by using the same part, then good. --- End quote --- Yes I can cut down Bom cost because the minimum quantity i can order is 10.I only need about 6 of them. |
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