| Electronics > Repair |
| Tekpower HY5005E-2 Current Limiting Issues |
| (1/1) |
| BlownUpCapacitor:
Hello! My Tekpower HY5005E-2 is experiencing some current limiting issues. It behaves in a really strange way compared to my other bench power supplies. Voltage works completely fine along with the current readout. I can use it to power my projects at two amps 50v no problem. The issue is that, when I try to set the current limiting by shorting the output, the voltage immediately drops to zero (as expected), but the current also drops. It will only supply a maximum of 110mA even with the current limit set to the max. As mentioned before, the supply will have no problem running two amps, but when the output is shorted to run the current, it doesn't work. The strange thing is if I apply a small load and steadily increase it, it won't have this issue. I can still set the current limit this way and it'll work, but the exact current limiting setting is all over the place. I honestly have no idea how to start troubleshooting this power supply. It does seem to be of the generic dual supply kind so maybe someone has experienced a similar issue and has found a solution? It has been like this ever since I pulled it out of the dump. Has served me well for more than a year. Thought it's about time to get it fully working. |
| indeterminate:
Do both power supplies exhibit the same problem , if so then the fault is in a common section of the supply or is just a design bug. unless sumthing is noticeably cooked or there is a dry joint then start by reverse engineering the circuit from the current shunt. once you have a schematic of the current measurement circuit it will make it easier to work out where the problem is and chk the low value electrolytics cap's to |
| BlownUpCapacitor:
--- Quote from: indeterminate on October 20, 2024, 10:04:24 pm ---Do both power supplies exhibit the same problem , if so then the fault is in a common section of the supply or is just a design bug. --- End quote --- Well, the left supply is more "normal" but still has issues. I can never get the current limiting to zero. When shorted, the left supply will only go to a minimum of 2.5 amperes, while the absolute maximum shorted is 3.6 amperes. These values are quite erratic and change. The right supply is as described previously. But like the left one, I can't get it to current limit at zero, unlike my other supplies. --- Quote from: indeterminate on October 20, 2024, 10:04:24 pm ---unless sumthing is noticeably cooked or there is a dry joint then start by reverse engineering the circuit from the current shunt. once you have a schematic of the current measurement circuit it will make it easier to work out where the problem is and chk the low value electrolytics cap's to --- End quote --- I'll try those. |
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