Selecting Power for Video Surveillance

Author: Ethan Ace, Published on Feb 24, 2013

Power is an important, yet unfortunately overlooked, element of video surveillance systems. While power is relatively inexpensive, mistakes in designing, supplying and backing up power can cause significant reliability problems.

Many of the most common service problems can be traced back to issues (or flat out errors) with specifying and planning power for video surveillance.

When power is commonly discussed in the industry, the focus is on Power over Ethernet (as if PoE is the one key issue). Though PoE is important, many times it cannot be used and, even if it used, it does not eliminate the other issues involved in powering surveillance systems.

In this report, we examine power options for video surveillance and factors impacting their selection and use. We recommend users review 6 main issues in designing power for video surveillance:

  • Determining Power Budget (Power Needed vs Provided)
  • Appreciating Specific Application Power Requirements
  • Deciding on Form Factor for Power Supplies
  • Deciding on AC vs DC (where applicable)
  • Specifying Backup Power
  • Selecting Overcurrent Protection

***** ** ** *********, *** ************* **********, ******* ** ***** surveillance *******. ***** ***** ** ********** ***********, ******** ** *********, supplying *** ******* ** ***** *** ***** *********** *********** ********.

**** ** *** **** ****** ******* ******** *** ** ****** back ** ****** (** **** *** ******) **** ********** *** planning ***** *** ***** ************.

**** ***** ** ******** ********* ** *** ********, *** ***** is ** ***** **** ******** (** ** *** ** *** one *** *****). ****** *** ** *********, **** ***** ** cannot ** **** ***, **** ** ** ****, ** **** not ********* *** ***** ****** ******** ** ******** ************ *******.

** **** ******, ** ******* ***** ******* *** ***** ************ and ******* ********* ***** ********* *** ***. ** ********* ***** review * **** ****** ** ********* ***** *** ***** ************:

  • *********** ***** ****** (***** ****** ** ********)
  • ************ ******** *********** ***** ************
  • ******** ** **** ****** *** ***** ********
  • ******** ** ** ** ** (***** **********)
  • ********** ****** *****
  • ********* *********** **********

[***************]

********, ** ******* ****** ***, ** **** ** ***** ***/** 12VDC *****. **** *********** ******* *** ***** **** ***/**** ***** also ****** ** ******* ***** ** ****. *******, **** ************* support**** ***** *****-**** *******. ** **** ******* *** ** ***** *******, but *****, ***’* ***** **** *** ******.

AC ** ** ************

** ** ** ** * *********** *********** ** ***** ************. Alternating *******, ** **, ************ ******* ***** (******** *********). ****** in *** ******** ******** *** *** **** ******* ************, ** can ** ******* ** *** **** ** ********* ******** **** easier **** **. ** ********, ****** ******* ** * ************** flow ** ***********, ****** ** ***-******* ************. ********* *** ***** cells **** ******* ** ******* *** **** ** ******** ** AC ** ******.

***** ************ ************ *** ***:

  • ****: * *********** ** ********** *****
  • ***: *** ******* ** ********
  • ****: * **** ** *****, *** **** ** ***** ********** energy ** ********* **** ****** *****. **** **** ********** *** Milliamps, ******* ** **, ***** ** *** ***-********** ** ** Amp.

Choosing ******* ** **. **

****, ** *** ****, ******* ***** * ****** ******* ***** and *****. *** ******* *********** ****** ******* **** ** ********. For ***** *********, ******* ***’ *** *****, ** ***** ** acceptable. ****** ****, ******* **** ******* *** ***** *** *** camera ****** ** *******. **** ** ***** ***** ***** **.

******** *** ******* ****** *** ******* ******* *** ******* ******* drop ***********. ** ** * ****** ** ***** ** **, at *****, ** ***** ******* .** ****, ** *** *********, of *******. ** * ***’ *** ** ** *** ****, this ******* ** ************* * **** ****. *****, *******, ******* that ******* ** .*** *, ********* ** **** .* **** loss. *** **** ******, ***** ***** ******** *** ********* ****, instead ** *****.

****, **** ** ***** ******* **** **** ****** *****, ***** power ******** *** ***** ** **** ** ***** ******** ***********, through *** *** ** ******* ********** (**** ** *********** ***). ***** ******* ******* ***** ***** ** ***** ** *** camera.

Power ******* - ***** ** ***

*** ******* *** ******** **** ** ******* ***** ************:

  • ******* + *******, *.*., ***** @ **: ***** **** ** power ****** *****, **** ***** ** *** ****** ******* *** total ******* ********.
  • *****, *.*., **: ********* **** **** ** **** ** ****** specs, ***** **** *** ********* ******* ** ********.

** ******* **** ** ***** *** **** *****, *** *** following ********:

  • ***** (** *****) = ******* (** ****) * ******* (** Volts)
  • ******* (** ****) = ***** (** *****) ÷ ******* (** Volts)

***** ****, *** *** ***** ** *******, **’* *** **** this ****** ******** .** ****, ** *** *********, ** ***** (A=9/12=3/4=.75), *** .*** ****, ** *** *********, ** ***** (*=*/**=*/*=.***). This ********** ******* ********* **** *********** *** ***** ******, ******* later ** **** ******.

Power ******

**** *********** *** **** ** ***** ****** ****** *** *** project, ** **** ** **** * ****** ** ******:

  • ** ***** * ***-******* ***** ******: *** ***** ******’* ***** supply *******, ** **** *** *** ***** ******’* *** ******* per ******. **** ** *** ****** ** *** **** ** PTC (********* *****) ** **** ******.
  • ** ***** * *** ****** ** *******: *** ****** ** midspan’s ***** *** ********.
  • *** ******’* (*** ***** *******) ***** *********** *******. **** **** occasionally, *** *** *** “********” *** “***” ** “*****” ***** consumption *******. ** ** *********** **** “***” ** ****, ** this ** *****-**** *** ****** *** **** ******** ** ************.

** **** ** *** ***** ******* *********** ** *** ******* and ***** ******* ***** **** **** *** ****** *** ***** current ******** ** *** ***** ******, *** ********** ****** *********** protection *******, *** ***** ****** **** ******** ********.

******* *: ********* ********** ******* ** ** *******, ***** ******* * ***** **** -- ***** @ ***** ** ***** @ *****. ** ** are ***** ********** **********, ** ***** *** ***** **** **** ***** ****** **** 16 *******, ** *** ***** ******* ***** ** *** (.******), and *** ***** ****** ** ***** *** **** ***.

******* *: ***** *** **** ******* ** *****, *******, ** could *** ********** *******, ***** ******** ** @ *****, ***** *** ***** ***** be .******* ** **. *** **** ** **** ***** ****** output ** **** **** ***** *** ****’* ******, ** **** present ** *******.

******* *: ********* ********** *** *******, *** ********** ***************** ******, ** *** ***** ***** ******* ****** ** ****** the ***** ******’* ******* ****** *******. **** ****** ******** ***, which ******* ** *.*** @ *****. **** ****** ** ***** the **** ****** ** *.**. *******, **** * ***** ****** current ** **.**, **** ***** ** *** ******* *** ** used -- * ***** ** ************* *** -- ** ******* four ** ***** ******* ***** ******* **** ***.

******* *: ********* ******** ** *******, *** ****** ******* ******, ** ***** ***** ***** *******, ** *** ****** ******** only ** (***** * ***). *** ****** ** **** ** supply *.** ****** *** *****, ** **** ***** **** ******* just ****.

******* *: ***** *** **** ****** ** *****, ******* *****-** *******, ** ***** **** ****** *** ** **** ** ***** cameras ****** ********* ***** ******, ** *** ****** **** ****** 15W ** ***** ** ** ** **** *******.

Power **** ********

**** ** ***** ************ ******* ***** *** ***, ********* ***** over *** **** ******** ***** **** ** **** **** ******* the ****** ** ***** ******, *** * ******.

*** ******* *** ********** **** *****:******* *** *******. ******** ***** *** *** ****** ******** **** *** ******, making *** ** ***-**-*** ************. ******** ********* ** ********** ********* between *** ****** *** *** ******. ****** *** ******* **** switch ** *******, *** **** *** ******* ** ** *** camera. ******** *** ***** **** ** ******** ************ **** ******** switches *** ***** ****, *** *** ******** *** **** ***** used ** *** ************.

*** ** ******* ** *** **** *********, ***.***-**** *** ***.***-****. The ******, ***.***, ********* ***** ** ** ** **.*** ** available ** *** ******** ******, ** * ******* ** *****. The ***** ********, ***.***, **** ***** ** ***+ ** *** Plus, ********* ** ** **.*** ** *** ******* ******. ***** are ******** ** *** ****** ***** **** ****** **** *****, in **** ***** ****** ****, *** ***** ** *** ****** to ***.* *********. *** ***+ ******** *** *********** ******** ******** more ***** **** ******** *** *** ********** ** **** ***** a ***** ******* ** **** *****-****** ******* ** **** ***** via * ****** *****. ***’* *** ******** ****** ******** ******** with ******* *** ******* ********* *** *** ** ******* **** a *** **, ** **** *****, * ***+ ****** ** midspan. **** ******** ** ********** ***** ** *** *** * separate ***** ****** ** *********, ***** *** ** **** ***********.

*** * ******* ********* ** *** ******** *** ******* **** PoE, ** ********* ********* * ********:

Non *** ************

*** ** ***** ********* *** ******** ******* ** ** ** surveillance ******, ***** ** ******* *** ******* ******** ** **** camera. ******* ******* ************ ******* *** *** ** ******** ***** supplies:

  • *** ** ******/******* ** ******* ******* ** *** **** ****** situation ********* * ********** ***** ****** ** ** ************. ***** outdoor ******* ***** ******* **-*** ** *****, *** *** ******* may ******* **-***. ******* ************ ** **** ***** *** *** possible **** ******** *** *** ******* ********-****** ***** ********.
  • ** ***** *************, ****** ******* **** ***** ******* ** ************ local ** *** ******, ** **** ********* **** **** ** it *** ** ********** ** ******** ***** *****, ******** *** use ** * *****-****, ***-*** ******.
  • **** ***** ********-****-**** ** ***** ***** **********, *** ****** **** require * ******** ***** ******, ***** ******* ** ***** ***** types **** ********* ***** ********* *****.
  • **** ***** ** ************, * ******** ***** ****** ** ********* required. ***** ****** *** ****** **** ********* ************ ***** ****** PoE *****, **** ** *** ********* ********* ****** ***** * PoE *******, ** ** ******** * **** ***** *** ********* be **** *** ****. ** *** *** ****** ** *** has ***** ********* *****, ** * ******* ** ***** ****, PoE ************ *** **** **** *****, *** ***** ** *** illuminators ** ******* ** ***** ***’, ** ***’ ********* *****. Note **** **** ****-********* ** ************ **** ******* ***-*** *** power, *** ***-*******.
  • **** ********* ******** ************ *******, ***** ***** ** ******. **** wireless ************ ******* (*** *** ******** *********** ****) ***** *** ******, ******** *** ****** ** ***********

Form ******* ** ***** ********

***** **** ************* ******* ** ********* ******, *****-****** ***** ******** are ********* ****. ***** ***** *** ********* ** ****** ****-***** or ****-***** **************. **** *****, ** * ******** ** ***** mounted ** * ****, *** ***** ****** **** ** ****-******* with **, ** ****** ******* **********. ** *** ******** ** a ******* **** ******, *** ***** ****** **** ********* ** wall-mounted, ***** ***** *** ******* *** ****** **********. *** ****** of ******* ** ***** ***** ******** *** **** ***** ** multiples ** ****, * ******** ********* **** ***** *** ** conjunction **** ****, ***** **** ******** ******** *, *, **, or ** ******. ****** ***** **** ***** $** *** * 4-output ****-***** ***** ****** ** $*** ** **** *** * 32-output ****-***** **** (******* **** ******).

***-******* ***** ******** *** **** ********* ** * ******-****** ****-** "wall ****" *****. **** **** ****** ** ****** **** ** multiple ****** ************* ***** ****, *** *** ***** ** **** in *********, ** *** ****** ***** *******. ******** **** **** a *** ******* **** *** ******** **** ******-****** ***** ******** greatly ********* *** ****** ** ** ******* ********, ** ** not ***********. ******, **** ***** *********, ******-****** ***** ******** *** often **** **** ******* ******* ******** **** ******/******* ***/** *** cameras. ****** ** ****** ****** ***** ******** ***** **** ***** $5 *** * ***** ****-** *********** ** $** *** * hardwired ** *********.

******* ************* *** **** ******- *** *****-****** ***** ******** ** whether **** **** ** ******* ******* ** ***. ******* ***** supplies *** ***** **** ********** ******* ** ************ ***** ************ in *********** *** ********, *** *** ********* ****** ** * weatherproof **** *********. ***** ********** *** ** ******* ******** ** a **** **** ****-******* *******, *** *******, **** ** ***** enclosure ******. *** ******* ** ******* ***** ***** ******** ******** in *** ******** ********* **** $**-*** ******* ** *** **** of * ****.

Backup ***** **************

***** **** ********** ****** ***** ******** ** ******** ********* ***** circuits, ***** ******** *** ** ****** ** ** *** ** two ****: ********* ** * *** ** **** ** ***** in *******.

********* ** * ***

*** ***** ****** *** ****** ** ********* ** * *** along **** ***** *********. **** *********** ** ********* *** ********** when **** *** ************ ********* ** ********. ******* *** ** calculated *** ****** ********* ** ** **** *** **** ******* each ********** **** *******. *******, ** ****** **** ***** ******* and * ****** ***, ******* ************** ** ******* ******* **** communication ******* *** ******* ******* **** *****. ***** *** ******** system ******** ******** *** ***** ** ****** ***** **** *** system *** ***** ******** *** *********, ***** *********** ******** * new ****** ** ***, ** **** */* ********* **** *** UPS ******* *** ****** ** ********* ***** ** *** ************ system, ** **** ******** ******* ** ***** *******.

***** ** *******

***** ******** **** ********* ******* ****** *** ******** **** *********. Use ** ********* ******* ****** ****** *** ************** ******** *** increases ************** ** ****** *******. *** *********** ********** (***** $*** ******) ******* ***** ****** ****** *** ($***+ ******) *** ********. ***** ***** ******** ***** ********* ****** power ** ** ********** ***** **** ** **** ** ******** to *** ***** ******. *******, ******** *** ***** ****** ** battery-backed, *** ********* ********* *** ********** **** **** ***** ******* backup ** **** ****, **** ***** * ***. **** *********** results ** ******** ********** ****** *** ********* ******* ** ***** failure, ******* ** ***** *** *********.

** ***** ***** ****** ***** ******** *** ******** *******, ******* backup ** *** ***** ****** ** ********** ** ************ ** a ***. ** ******* ** ***** ********** *** ********** ******, and * ***-******* ***** ******/******* **** ********* *** ****** *****-**** than * *** **** *** **** ******* ********.

*** ****** ** ****** ******* ***** ** ********* ** *** given *********** ** * ****** ** ********** *** ************ *** the ******** ******. ** *** **** *****, ****** ** ******** recommended *** ******* ***** ************ *** *********** ** ****** *** sags. * ***** ****** ** ****** **** ****** ******* ** shutdown **********, ***** ******* *** ****** ** ****** *** ** forced *********, ***** *** ******* ********* *** ************* *****. **********, if ****** ******, ** ** ********* ** ****** ** ***** 1-2 ***** ** ****** *******, ****** ** **** *** ***** losses ** ***** ******* *** ************ ** ****** *********.

Overcurrent **********

*** ***** ************* ** *********** **********. **** ******** *** ******** camera ** ***** ****** **** ***** ******* ****** * ***** come ** ******* **** **** ******* ******.

  • *** ***** **** ** *********** **********, *** ******** *********** *********** Resistor, ** ******* ** * ******* *******. ** ******* ******* through *** *** *********, *** *********** *****, ***** ****** * dramatic ******** ** **********, *********** ******* *** *******. ** *** PTC *****, *** ******* ** **** ***** ******.
  • *** ******, *** **** ****** **** ** ********** ** *** fuse, ***** ******** ** * **** ***** ***** ** **** that ****** ***** **** ******* ** *** *****. ***** **** are ********** ** **** **** ***** ********** **** *** *********** condition ** *******, **** *** ** ****** ********** *** **** to ****, *** *** ******* *** ********* ******. *****, ** the ***** ****, **** ****** **** ** *** ******** *******, almost ************ ******** ********* ** *********. **** *** ***********, *******, and **** ****** ******* ****** ************ ** ******* *****.

** ********* ***** ** ********* ** **** *** ****** *********. PTC’s **** ***** **********, *** ****** ***** **, * ******* call **** ****** ****** ** *********, ** *** ******** ****** is *** *******, *** **** ***** *** ***** ********* **** caused ** **** ***** ***** * ******* **** ******** *** situation. ***** *** *********** **** **** ** ** ********** *** not ********** ** ********* ******, *** ******** **** ** **** reset ****** *** *** ******* * ******* **** ******* **** weaker, *** * ****** *** ********** ** ********** ** *** fuse ***** ****.

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