Denna nätenhet bygger på SMPS-teknik med ultralåg brus som ger en spänning på 5V och en maximal ström på 2,85A
Att konstruera en audioanpassad nätenhet med SMPS teknik är inte det lättaste. Det tog företaget två år att utveckla denna enhet.
Det handlar mycket om att få ner brusnivån efter switchdelen vilket man lyckats med. 0.8-1.2uV brus i frekvensbandet 0Hz to 20KHz (0-2.85 A last).
Denna kan mäta sig väl med linjära nätaggregat.
This ultra low noise SMPS power supply offers a power rail with a voltage of 5V and a maximum current of 2.85A.
This power supply rail is accessible via two connectors:
- The first DC jack connector located at the end of a cable (non-removable) and comes with its full complement of DC jack / micro USB / USB-C adapters.
(Det medföljer 6 oilika adaptrar för att passa många kontaktkombinatinoer. Se nedan.)
- The second USB-A female connector is located directly in front of the power supply.
The box has a ground connector and a switch on the front panel to activate / deactivate this connection.
The whole circuit is mounted in a 100% aluminum case, ideal for avoiding noise pickup while providing excellent robustness to the device.
Nirvana SMPS was designed to power audio devices with the lowest noise.
1: 1 X DC 5.5 X 2.1mm Input konverteras till 5.5 X 2.5mm
2: 1 X DC 5.5 X 2.1mm Input konverteras till 4.0 X 1.7mm
3: 1 X DC 5.5 X 2.1mm Input konverteras till 4.8 X 1.7mm
4: 1 X DC 5.5 X 2.1mm Input konverteras till 3.5 X 1.35mm
5: 1 X DC 5.5 X 2.1mm Input konverteras till Micro USB
6: 1 X DC 5.5 X 2.1mm Input konverteras till Type C
|Product type||Power supply|
|Power supply type||SMPS|
|Power supply rail||1x5V 2.85A|
|Connectors||Jack DC + adapters (all Jack DC formats + Micro USB / USB-C)
|Input voltage||100-240VAC (fixed cable connection)|
|Block dimensions||126 x 63 x 41mm|
There are 3 types of noise:
1. Differential noise (noise on power lines compared to GND)
This is what everyone calls noise. The easiest to understand this is first where Nirvana shines. 0-20Khz (audio band) noise is 0.4 to 1.2uV including mains frequency. Please note that those numbers reflect real world testing with no isolation transformers (since you don’t have one in your house).
2. Common mode noise
A bit harder to understand, it represents noise on both power and GND that moves in the same time. Since GND has the same noise as power lines, it’s invisible to most test equipment (single ended probes). Nirvana shines also in common mode noise with less than 1uV 0 to 20Khz.
3. Leakage current
Any switched mode power supply (smps) has a small transformer that creates EMI because of the abrupt on/off of mosfets. To counter it, we have a capacitor across the input and output of the transformer (that has a special rating Y since failure can be catastrophic). The problem is that EMI filters (AC side) is leaking some current that finds its way to the Y capacitor and into GND of DC side. There is however a simple solution, earth the AC side first (Nirvana has it) and if needed earth the DC side ground. Nirvana has a switch that allows both to have the 5V side ground earthed or floating.
Those are the main noises on output… but wait that’s not all. The SMPS makes noise that finds its way into AC (where your DAC and AMP take power). We used on Nirvana a rather sophisticated network of EMI filters (common mode) and inductors (differential noise) protection… for AC side. (in addition to DC side).
At last. With all the noises down, we looked at one more parameter that makes sensitive devices perform better. Capacitors. With plenty of power on the output of SMPS, you smooth all abrupt current demands. Nirvana has 8200uF of capacitors (chosen to have good thermal rating) that’s usually 10x more than what you find on a normal SMPS.
All this to say that Nirvana SMPS is a true competitor to a good LPS. We do not compete on marketing but on good engineering.
Nirvana has only one output at 2.85A/5V
No load is 5.2V , 2.85A 4.97 to 5.03V
We provide USB connection for convenience only it’s not a second, galvanically separated output.