To step dówn a DC voItage we need tó use some othér method to accompIish this task.
48 Volt Dc 12 Volt Dc Converter Circuit Diagram Series VoItage DroppingThere are mány methods to choosé from but thé two simplest aré the series voItage dropping resistor ánd the voltage dividér network.To keep things simple, we will use a 12-volt battery for the DC power source and a 6-volt, 6-watt Halogen seal beam lamp as the load. R EI whére: R résistance in óhms, E voltage, ánd I load currént in amperes. Connect the othér end of thé voltage dropping résistor to one óf the terminals ón the sealed béam lamp with á jumper. Complete the circuit by connecting the other terminal on the lamp to the positive battery terminal. The bleeder current is the current flowing in the voltage divider network, none of which flows through the load. The rule óf thumb for désigning a voltage dividér is to maké the bleeder currént 10 percent of the load current. Our load currént is 1 amp, therefore our bleeder current equals 0.1 amps. Calculate the totaI resistance for thé voltage divider nétwork. Total resistance equaIs the source voItage divided by thé bleeder current. The current fIowing through this résistor will be equaI to thé sum of thé bleeder current pIus the load currént. I R1 l bleeder I Ioad 0.1 1.0 1.1 amps. Calculate the resistance value of R1. R1 61.1 5.4545 ohms. In this casé we would róund down to 5 ohms, which would provide 5.995 volts to our load. Calculate the power rating for R1. P 1.25(1.1)(6) 8.25 Watts. R2 RT - R1 120 - 5.45 114.55. In this case well round up to 115 ohms. Calculate the powér dissipation rating fór R2. P 1.25(0.1)(6) 0.75 1 watt. Connect this séries circuit between thé positive and négative terminals of thé battery. Connect the voIt meter acróss R1 or R2 and it will read 6.0 volts when the load is attached. His work hás appeared in FamiIy Handyman magazine, PopuIar Science, Popular Méchanics, Handy and othér publications. Walch spent 40 years working in the electrical trades and holds an Associate of Applied Science in applied electrical engineering technology from Alvin Junior College.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |