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Old 24th October 2012, 12:23 AM   #561
kp93300 is offline kp93300  Malaysia
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Quote
Kp, for single 24V SMPS300R, not RE is suitable, SMPS300RE has only dual output voltage, +-xx V. If the required current is max. 4A, the SMPS200QR can be used too. it is the smallest size power supply with output power >200W for audio applications or ~ 100W continuous. If only one rail is needed, then the diodes from the negative output can be reversed and both positive an negative output can be paralleled to increase the output current, or to allow the diodes to work at half current.

Hi Cristi ,
Between the smps 200R and 300R , from a measurement point of view, which one measures better if used within the ampere range ?
thanks

kp93300
 
Old 24th October 2012, 07:49 PM   #562
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Default Short circuited my smps500R

Hi Cristi,

I have bought a pair of +/- 50 Volt smps500R at Audiophonics (France).

When I received it measured +/- 49 Volt.

During testing the output cables touched a metal surface... sparks

Directly after the incident I inspected the board with a magnifier glass and could not find any burned parts. I powered it up again and the outputs measured +/- 98 Volts.

After 30 minutes I measured again to make sure my readings where accurate and now I have the normal reading again

I have checked again and put it back into my amp and now it is playing normally

What should I do??
 
Old 25th October 2012, 01:16 AM   #563
djQUAN is offline djQUAN  Philippines
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Quote:
Originally Posted by peterhenk View Post
Hi Cristi,

I have bought a pair of +/- 50 Volt smps500R at Audiophonics (France).

When I received it measured +/- 49 Volt.

During testing the output cables touched a metal surface... sparks

Directly after the incident I inspected the board with a magnifier glass and could not find any burned parts. I powered it up again and the outputs measured +/- 98 Volts.

After 30 minutes I measured again to make sure my readings where accurate and now I have the normal reading again

I have checked again and put it back into my amp and now it is playing normally

What should I do??
Did you measure at exactly the same points? 98V is exactly 2X 49V. you must have shaky and measured across V+ and V- after the sparks instead of V+ to common and V- to common.
 
Old 25th October 2012, 06:06 AM   #564
Cristi is offline Cristi  Europe
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Matt: The SMPS800R output voltage will slowly decrease during power off sequence to near zero if the amplifier has an idle current draw of at least 50-100mA. If there is no load or the amplifier consume much less, is possible that the output voltage to fall then when reach about half the power supply to restart switching for brief period, increasing the output voltage with 20-30%. this happens because at power down, the capacitors which store the energy for controller and driver section, will discharge much faster than the large caps, because is much smaller, 100 uF at 25V compared with two 1000uF at 200V, and since the large caps are still charged, the small cap will be recharged in about 2-3 seconds and restart the smps for a brief period till most of the stored energy from the large caps is consumed. On board there is a circuit to prevent the power supply restart, there is a resistor divider which supply one pin of the controller ic with a divided voltage from the mains DC bus, so when this voltage drops below ~240V DC the smps will shut-down and will not restart till the power is applied again. However, to be able to work properly in every corner of the world, where the mains voltage can be substantially lower, I decided to reduce this threshold to about 200V. this means that the smps should work also with 180V AC or 90V AC voltage. If the mains supply voltage is stable, over 200V or 100V then the initial values for the divider can be used, so the smps will not restart once is turned off.
On the other hand, the amplifier itself must feature an UVP and OVP protection, not only for this issue but also to prevent erroneous switching frequencies and damage due to excessive bus pumping when is supplied with too low, and too high voltages. The threshold for UVP must be not lower than 70-75% of the nominal supply voltage and the threshold for OVP must be not higher than 120-125% of the nominal supply voltage for safe and reliable operation.

KP, SMPS300R has higher output power and the output voltage is regulated. If set for 24V, will stay still at 24V from zero to max. current. SMPS200QR output voltage is not regulated, and follow the mains voltage +- few percent. for example, will be about 25-25.5V with no load will reach 24V at 2A and will drop to 22V at 6-7A if both rails are paralleled. This power supply has similar behaviour as a classic mains transformer+ rectifier bridge and bulky caps, at a fraction of the size weight and cost, and requiring smaller filtering caps due to high switching frequency ~100KHz. also the efficiency is higher than a classic solution, with 5-10% more. for +-24V or modified single 24V the efficiency reaches 93% at 230V mains and for +-36V efficiency is ~94.5% while a mains transformer+rectifier bridge+caps have an efficiency around 85-88% for the best ones. the reason is obvious, there are lot more losses in few pounds of iron and one pound of copper for a mains transformer than on a tiny smps transformer. both hysteresis losses and I2R losses are greater when the amount of material used is higher, while the losses per gram might be higher for smps transformers.

Peter: I noticed your mail regarding the same issue this morning. I believe, same as DJquan that you measured the voltage across V- and V+
Suppose that the smps was damaged after the short-circuit, there could be two possible type of damage: 1. completely dead, if something couldn't withstand the short circuit, then you would have zero output voltage, and probably blown fuse and 2. loss of output voltage regulation, this happens if the small potentiometer is damaged because the output voltage information for feedback circuit is lost and the smps will increase the output voltage at maximum. In this case, the max. output voltage for +-50V will be about +-75V not more than +-78V. at this output voltage the output caps would be already vented and the rectifier diodes also shorted. there's no way can reach +-98V without serious damage. is already double the nominal voltage.
Also, don't exclude the multimeter error, some cheap multimeters have huge errors when the battery is discharged, as the reference voltage for their ADC drops significantly.
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Old 25th October 2012, 06:17 AM   #565
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DJquan / Cristi,

Thank you,

It is playing music and sounds good and measures good..... Must have been shaky hands after the sparks

Peter
 
Old 27th October 2012, 06:37 AM   #566
i2k92 is offline i2k92  Indonesia
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Hi Christie, which one of your SMPS most suitable to power Hypex 180HG ? thanks in advance.
 
Old 6th November 2012, 07:58 PM   #567
Cristi is offline Cristi  Europe
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SMPS300R(E) for a single UCD180 or SMPS500R for two UCD180.
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Old 20th November 2012, 09:30 PM   #568
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Quote:
Originally Posted by Cristi View Post
The power supply boards contains only one stage EMI filtering, and for a power supply like A1000SMPS which use the classic hard-switched topology instead of the newest soft-switched topology, an extra EMI filter stage is always welcomed and for sensitive applications necessary.
Hi Cristi,

According to your web site the A1000SMPS uses soft-switch technology not hard-switch as you state above.

Which one is it?
 
Old 19th December 2012, 03:45 AM   #569
JZatopa is offline JZatopa  United States
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I am looking at a SMPS500R-single to power my pass zen amplifier. Is there any limit on capacitance on the output?

I'm also curious if there is any problem with me using a SMPS500R +/-24V and hooking up the amp circuit across the + and - taps?
 
Old 20th December 2012, 02:47 PM   #570
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Hi Cristi,

I am looking to eventually power some amps I picked up in the Wire Lateral Mosfet Amp group buy. I know you were intending to create a PS just for that amp, but health problems put that off - I hope you are better now.

I intend to use my Wire amps for biamping individual speaker drivers, so won't have the huge power requirements of most participants of that group buy, but I do want to power the amps for full Class A operation. I see from previous posts that you recommend your SMPS500R for Class A operation and this sounds fine for my 8 ohm midwoofers that I want to power at +-36V or so.

I want your advice on powering 4 ohm tweeters - also in Class A. I preferred running them at +-16V, but I see that the lowest custom voltage you provide is +-18V and that only with your SMPS300RE. I can live with that voltage, but wonder about the SMPS300RE's ability to provide 2 amp biasing since you specifically recommend the SMPS500R for higher bias requirements. If 2 amp is too much for that PS, can you tell me just how much bias the 300 can reliably provide. Also - will there be startup issues with these amps powering up into this bias load? I expect that there may be some additional heatsinking required - will that be a relatively simple addition?

Is this SMPS500R, SMPS300RE combination what you would recommend for my situation?

Thanks for your advice!!
 

 


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