Hello everyone
I haven't had any experience with switching power supplies and I’m not sure what is a normal behavior at the voltage output of my Connex Electronic SMPS300RE. It is a version with a dual voltage output and a dual aux voltage. It should be the current version of the power supply unit, but it looks a bit different to the pics on the manufacturer website.
So what do you think, can a defect be assumed if the positive voltage drops immediately after disconnection from the mains, but the negative voltage drops slowly?
There is a little difference of 0.5 volts between the positive and negative voltage. The dual auxiliary voltage drops evenly and slowly on the positive and negative side.
I would have assumed that either the output capacitor of the positive main voltage is defective or that there is a short circuit. Does anyone have any experience of what is the "normal" behavior of such a switching power supply?
Regards
Josoeff
I haven't had any experience with switching power supplies and I’m not sure what is a normal behavior at the voltage output of my Connex Electronic SMPS300RE. It is a version with a dual voltage output and a dual aux voltage. It should be the current version of the power supply unit, but it looks a bit different to the pics on the manufacturer website.
So what do you think, can a defect be assumed if the positive voltage drops immediately after disconnection from the mains, but the negative voltage drops slowly?
There is a little difference of 0.5 volts between the positive and negative voltage. The dual auxiliary voltage drops evenly and slowly on the positive and negative side.
I would have assumed that either the output capacitor of the positive main voltage is defective or that there is a short circuit. Does anyone have any experience of what is the "normal" behavior of such a switching power supply?
Regards
Josoeff
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I wouldn't worry too much about it. Do you get the proper DC Voltage at the outputs and under load for some consistent time? If so, I'd say the PSU is working as advertised. If you're that concerned, contact Cristi and ask him. I've used Cristi's SMPS's for years and have a variety of his single and dual voltage units, and never had the first problem with any of them. As far as I'm concerned, they are professionally built and simply reliable to use. They should serve you well if not abused.
Hi. Faster positive voltage decrease after mains disconnection may mean few possibilities : 1. Loss of output capacitor capacity. 2 there's a feedback, with optocoupler , which controls output voltages by positive output , and it draws some current from positive output , thus capacitor discharge faster .3. Diode leakage too high. 4. There are no bleeder resistor for negative output, or resistor for positive and negative output loads are different. You can try to connect a 10k resistor at negative output and see if both outputs are decreasing similarly.