hi ,i am after a few things cleared up about the center tap rectifier which is in the attachment.
I am asked to work out the average value of voltage across the 100 ohm load resistor.
the power dissipated by the resistor
the minimum PIV rating of the diode
1. first off i'm told that the voltage of the primary coil is 120v
i'm then told that the coil ratio NP:NS = 4:1 where NS is half of the secondary coil. giving 30v each on half of the coil. Am i right in thinking that this is 30v from the positive and 30 from the negative AC in but because it goes through the Load resistor in the same dirction it gives a voltage of 30v minus the 2 diode voltage drops of 1.4 ( assuming they are silicone) giving a Vout of 28.6????
2.okay so then i go on to work out the current through the resistor which i multiply by the voltage to give the power.
3. okay the average voltage is 28.6v so the peak voltage is root 2 * 28.6 = 40.45 V + the peak secondary voltage = root2 *30 = 42.4 v okay so i add them together and half them to give 40.45 + 42.4 =82.9 /2 = 41.4 V
does this seem right? tbh i dnt really have any idea what i'm doing. any help is much appreciated. Thanks, Lee.
I am asked to work out the average value of voltage across the 100 ohm load resistor.
the power dissipated by the resistor
the minimum PIV rating of the diode
1. first off i'm told that the voltage of the primary coil is 120v
i'm then told that the coil ratio NP:NS = 4:1 where NS is half of the secondary coil. giving 30v each on half of the coil. Am i right in thinking that this is 30v from the positive and 30 from the negative AC in but because it goes through the Load resistor in the same dirction it gives a voltage of 30v minus the 2 diode voltage drops of 1.4 ( assuming they are silicone) giving a Vout of 28.6????
2.okay so then i go on to work out the current through the resistor which i multiply by the voltage to give the power.
3. okay the average voltage is 28.6v so the peak voltage is root 2 * 28.6 = 40.45 V + the peak secondary voltage = root2 *30 = 42.4 v okay so i add them together and half them to give 40.45 + 42.4 =82.9 /2 = 41.4 V
does this seem right? tbh i dnt really have any idea what i'm doing. any help is much appreciated. Thanks, Lee.
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