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