H - Electricity – 04 – H
Patent
H - Electricity
04
H
H04H 20/76 (2008.01) H02M 7/538 (2007.01) H04B 3/44 (2006.01) H04N 7/10 (2006.01) H02M 7/538 (2006.01) H04H 1/02 (2006.01)
Patent
CA 2141441
A polarity reversing DC power inserter circuit (204) for remotely located equipment such as interdiction apparatus or other signal control apparatus used in a cable or community antenna television (CATV) signal distribution system. A power transformer circuit (210) receives a 117 volts AC power source at a subscriber's premise and converts it to a lower voltage positive and negative DC. A polarity reversing circuit (204) comprising switching transistors (220,221) and a 50% duty cycle multivibrator (230) switches between the lower voltage DC at a frequency less that 10 Hz so as to avoid shock hazards associated with normal alternating current, while alternating sufficiently often to avoid electrolysis and corrosion problems associated with use of direct current (DC) powering. The reversing polarity DC power is then inserted into a cable drop (115) to be provided uplink to the signal control apparatus. At the signal control apparatus, the polarity reversing DC is converted into DC by a power utilization circuit, and then utilized to power the signal control apparatus.
Blonder Tongue Investment Company
Finlayson & Singlehurst
Scientific-Atlanta Inc.
LandOfFree
Polarity reversing dc power supply for remotely located... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polarity reversing dc power supply for remotely located..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polarity reversing dc power supply for remotely located... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1918126