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Mulview CCTV-FAQ

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power supply FAQ
power Supply---(Switch power supply)
1. Notes on choosing a switching power supply?

Ans:
(1) To increase the reliability of the S.P.S., we suggest users choose a unit that has a rating of 30% more power than actual need. For example, if the system needs a 100W source, we suggest that users choose a S.P.S. with 130W of
output power or more. By doing this, you can effectively boost the reliability of the S.P.S. in your system.

(2) We also need to consider about ambient temperature of the S.P.S. and whether there is additional device for dissipating the heat. If the S.P.S. is working in a high temperature environment, we need to make some derating to
the output power. The derating curve of “ambient temperature” versus “output power” can be found on our spec sheets.

(3) Choosing functions based on your application:
 ●Protection function: Over Voltage Protection (OVP), Over Temperature   Protection (OVP), Over Load Protection (OLP), and etc.
 ●Application function: Signaling Function (Power Good, Power Fail), Remote   Control, Remote Sensing, and etc.
 ●Special function: Power Factor Correction (PFC), Uninterruptible Power   Supply (UPS) function.

(4) Make sure that the model qualifies for the safety standards and EMC regulations you need.

2. How do we choose a power supply to charge a battery?

Ans:
Mulview has some series for battery charger purpose (120~360W). If these series does not meet customers’ demands and they like to choose a power supply as a charger, we advice to pick up one which over load protection (OLP) mode is constant current limiting. The models in this mode provide constant current even when the protection circuit is triggered.
The second choice is fold-back current limiting or constant wattage model. In this model, when a battery is running low, the output current of the power supply will gently increase. The level of increase depends on battery’s capacity
and degree of exhaustion.
Hiccup or shut down model are not recommended because it will stop to generate current when OLP happens.


3. Can Mulview’s power supply be used in the range of 45Hz ~ 440Hz? If YES, what will happen?

Ans:
Mulview’s power supply can be used within this frequency range. But if the frequency is too low, the efficiency will also be lower. For example, when a SP-200-24 is operated under 230VAC and rated load, if the frequency of AC input
is 60 Hz, the efficiency is around 84%; however, if the frequency of AC input reduces to 50 Hz, the efficiency will be around 83.8%. If the frequency is too high, the power factor of the S.P.S. with PFC (power factor correction) function
will reduce and this also will cause higher leakage current. For example, when a SP-200-24 is operated under 230VAC and rated load, if the frequency of AC input is 60 Hz, the power factor is 0.93 and the leakage current is around
0.7mA; however, if the frequency of AC input increase to 440 Hz, the power factor will decrease to 0.75 and the leakage current will rise to around 4.3mA.

4. If we need a 24V output power supply, but Mulview does not have this model, can we use two 12V power supplies connecting in series instead of one 24V power supply?

Ans:
YES, basically you can do this to get the right output voltage, but be careful that the rated output current of the series system should be the rating of the minimum one in these series connected power supplies. Furthermore, we like you to parallel a diode at the output of power supply to prevent possible damage of internal capacitors.

5. If we need a 600W output, can we use two units of S-320 connected in parallel?

Ans:
No, you can not do this connection because S-320 is not equipped with the parallel function. When two power supplies are connected in parallel, the one with higher output voltage will share more loading and deliver more (even “all”)
power to the load and cause these two power supplies to be unbalanced. We suggest using PSP-300 or PSP-500 because it is equipped with the current sharing function.

 

 
   
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