Products > Test Equipment
HSPY Power Supply
<< < (5/8) > >>
dirtcooker:

--- Quote from: 0x10c on July 27, 2020, 04:39:09 pm ---Hello everyone! I boght a 1000V 1A version of this power supply. This is really usefull, good and cheap device. But after a day of experimenting i broke it, short circuit on the hot part (see photo). As a result of a short circuit, the output diodes of MUR460 burned out, and two HV mosphets 2SK3748 too, on the "hot" part burned two mosphets 47N60C3 and one gate drive mosphet [or bipolar] transistor I unsoldered it (the inscription can't be read, see photo of backplate). So output diodes MUR460 are too weak, two diodes are connected in series (one diode is designed for 600v, a two consecutive: for 1200v), for impulse load this is not enough and i think this caused the failure. So i think full repair cost is about 100$  :-//

--- End quote ---

did you short the output of the power supply? Or something inside the unit? Any decent current limited bench supply should be able to handle a short circuit. In fact, that's how you set the current on some of them.
How about replacing the MUR460's with an RURD4120 4a 1200 fast recovery diode?
Andrusca:
Hello.
I bought two HSPY power supplies some years ago. One is 400V-2.5A and the other is 50V-20A. I had an "explosion" issue with the 400V model. Just adjusted 400V output voltage and loaded with 300W for some minutes. Before that, I rarely have gone more that 300V-350V output voltage. When I took it apart to see what had happened, I sadly discovered that the power supply employs 400V electrolytic capacitors at the linear regulator output and at the switching regulator output.  :palm:   The output capacitor well in parallel with the output jacks simply exploded. It had survived until now since I rarely surpassed the 350V before.
Luckily, I have identified almost all the other damaged parts: output transistors IRFP460 and TSP60R190S1, discharge current ancillary diode UF4007, discharge current regulator opamp LM358 and a small 1K 0805 SMD resistor. I do not yet discovered the value of the blown TH film resistor, marked in the attached pictures, used to set the discharge current of the TSP60R190S1 MOSFET. It looks like a 100ohm 1/2W 1% resistor, but I am not sure. My version on the HSPY 400V-2.5A seems to have a PCB layout and some components a bit different from the ones shown in previous pictures.  The 300V-3A model shown previously in this thread seems to use a 10ohm 2W resistor for that function, while my 50V-20A model uses a 5.1ohm 2W resistor.
Perhaps you have a similar model and can help me to find out that resistor value
Many thank!
Hydron:
I have the 400V/1A version, and the resistor is indeed 100 ohms. There are certainly differences between the two models, though the main one appears that the board in yours is longer to fit another SMPS on the end near the fan.
I should probably change the 400V cap in mine, unfortunately I hate working on it as it is very hard to get apart - I have already modded it by:
- removing Y-capacitors between mains (AC) and the output (increasing the ones between earth and the output to compensate) to massively lower mains leakage via the capacitors
- blocking the upper row of vents to force the airflow past the hot bits instead of bypassing them (the top heatsink on the 1A model doesn't get warm, it's only the lower ones) - the 2.5A version seems to have the fan in a better position.
- moving the temperature sense location to one of the lower heatsinks (the one that isn't live at the switching frequency, though it still is at mains voltage so care needs to be taken!)

Edit: just saw the query about software for the unit - I wrote a driver for this software by HKJ for my 400V/1A unit, should be included in the latest version:
https://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/
Will need some changes for other HSPY models, but the driver is very easy to change (will likely just need the limits and maybe scaling to be changed).
Andrusca:
Hi Hydron, thanks for your answer.
I am surely replacing all the 400V caps by 500V units and I will also check the Y-capacitors. Another thing I would want to ask you is if your 400V-1A version uses the same TSP60R190S1 MOSFET. I noticed that it will be quite hard for me to get this exact part number and wonder if maybe your version is using some other equivalent MOSFET that could be easier to obtain. In a few days I will continue my searching for more damaged parts, but I hope to find no more.  Then I will power up the power supply after having all damaged parts removed to inspect if there is still another unseen defect.

Interesting your HSPY driver for the TestController software. After repairing my unit, I will try to adapt your driver to mine.

 
Hydron:
Mine has a different MOSFET. I can't remember the exact connection of the MOSFET, but if it is only being used for discharging when the output is turned off then it probably doesn't matter what one is used as long as the voltage rating is OK. See attached pic.
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod