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KUAIQU Programmable Switch Mode Power Supply [*SPPS-D3010-232 32v-10.2A/325W]
Nya:
I purchased a similar model KUAIQU SPPS3001D (300V 1A, 301V 1.1A max)
After turning off the mains power it still works for EIGHT damn seconds with no load!
C30 0.1uF SMD on the front PCB was soldered vertically to the C57 position.
C30 is connected in parallel to C29 1uF on the PCB.
Output capacitors 68uF*400V x 3 pcs.
Adjustment pots on the main PCB:
"V-1" 2k: output voltage adjustment (not display reading), requires about 850 ohms.
"A-1" 200 ohms: CC point adjustment (not display reading), requires about 70 ohms.
There are no other analog adjustments, and I tried holding some buttons while powering up - no luck.
I replaced the single turn ceramic pots with multi turn ones because there is a couple of volts of error from the factory.
You can set the output voltage in a very low range (around 2 volts) due to some feedback, and at some point the display will start showing the wrong voltage.
The output voltage is quite good with an accuracy of 0.1 V or better, the display showing "10 mV" is not necessary.
The accuracy of the current is not very good. The minimum current displayed is 11mA, so "0.000A" instantly becomes "0.011A", and the error is +/- 1-2mA.
Also, there is hysteresis for the CC point.
There are two voltage ranges:
00.00V
000.0V
And one range for current:
0.000A
If you switch the decades of voltage ..70-80-90V to 100V, the next step you will adjust the hundreds 100-200-300V, because the flashing position has not moved, but the display has moved the dot:
90.00V
100.0V
There is a disadvantage: the encoder is always set to the "adjustment" position, even if the number on the display stops flashing after adjustment, and if you accidentally turn the encoder, the voltage/current will be adjusted. Therefore, you need to use the "Lock" button or be careful when turning the encoder.
When you turn on the power or switch between presets, PSU automatically switches to "Off" mode.
The LCD display looks good.
Nya:
Pics
ass20:
I see photos of 300V 1A version and compare it with 30V 10A
shematic design on 300V version has differens on output stage
On 300V used another rectifiaer diodes add common choke on output
I have power supply based on BR300 board (30V 10A) but it is have very bad input commone mode filter... commone choke onle 2mH .. it is very low..
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