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Oct 18, 6. I also look for resistors that are darkened from heat, don’t see any in your picture. I replaced the fan and reassembled the unit to see if it would power back up. In this Teardown Tuesday, we are going to take a look at the inner workings of a radar datasheeg Dodgydave – Yes, it is a 12V output supply.
SC Transistor 2SC NPN, V, 10 A, TO-3PN at reichelt elektronik
Ok, sorry it took me a few days to get this check done. I’d like to check the ESR again since the overheat.
The ESR of the big caps is climbing with every troubleshooting attempt. Oct 18, 8. Not obviously bad, but certainly not good. Once I disconnect them the power supply comes to life.
I figured this is what blew the power supply. As soon as I get the lager caps in I’ll change them all just in case. After that I can plug the peltiers in and the unit continues to run dataseet and cools quite well. Oct 18, 5. Same result with another 1uF cap in paralell. I found one fan that was drawing much more than its rated current and not turning. The other parts that get stressed are the snubber R-C components, hard to pick out without a schematic.
Oct 18, 4. Oct 17, 2. Jun 22, 7, 1, It could be that the soft start circuit is not ok. Oct 21, Dec 4, I just can’t get the power supply to fully power up without manually disconnecting the peltiers then plugging them back in.
I keep seeing alot if info regarding ripple current, but not ESR. Does this make sense to anyone? Once the power supply is up and running, I can plug the coolers back in and the unit cools perfectly. You May Also Like: Switch Mode Power Supply Posted by zulkifli in forum: Datashee fans are wired to run all the time. I do have a low budget scope, so I checked out pin 4. Output pulses on pins 8,11 feed the slave osc transistors 2sc, they self oscillate at 2sc3360 pulsing the transformer on the right, which feeds the 12 dc supply back to the ic on pin 12 to take over.
I also checked the other fridge components thermoelectric peltier coolers and four fans using a DC bench power supply.
Radar Gun If you’re a speeder or sports player you may have experience with one of these! BTW, does the uF still gets hot, when everything is ok when you connect the peltier loads after sometime? The peltiers are connected to the relays you mentioned via the NC contact. AS to the cooking switch transistor: It shows about 1. Oct 17, 3. If the peltiers are plugged in at power up, datashedt voltage between pins 12 and 7 is about 1. You can force the ic to kick up by connecting pin 4 to pin 7 ground but as your not getting the 12 supply to start withi would say there is an heavy load pulling the slave osc down.
Oct 17, 1. Can anyone tell me what type of SMPS this is? The TL usally has a slave start up oscillator oscthat produces its voltage, then the the ic takes over and feeds the start up osc with sync pulses to produce the desired regulated voltage,so your circuit will be similar to this design ,without the op amp chip. I also datasheey that, once up and running, one of the heat sinked power transistors and its associated V uF input cap is getting very hot.
Sep 7, 2, Clearly didn’t know that. Do you already have an account?
Switch Mode Power Supply
Are these related somehow? Also, I can’t seem datasueet find the datasheet for these caps anymore. No, create an account now. Is this a common problem with a SMPS?