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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 265

Active bridge rectifiers reduce heat dissipation within PoE security cameras

Ryan Huff

Abstract

Active bridge rectifiers that reduce heat dissipation within Power over Ethernet (PoE) security cameras are described.

Keywords

Power over Ethernet

security camera

LT4320

LT4275

Introduction

Power over Ethernet (PoE) has been embraced by the video surveillance industry as a solution to an age-old problem: complicated cabling. For instance, a basic, traditional fixed-view security camera requires two cables: one for power (10W to 15W from a 24V AC or 12V DC), and a separate, coax cable for the video signal. With PoE, a single Ethernet cable carries both video data and power. Everything is simplified. Right?

Not quite. To meet ...

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