Equipment Required: 1 - Brute Force power supply and 723 Regulator board 1 -Tran

Question

Equipment Required: 1 - Brute Force power supply and 723 Regulator board 1 -Transformers (120Vrms input, 1:10 and 1:20 outputs) 1 - Various load resistors, high power Digital Volt Meter and Oscilloscope uSe -.-..-.--'"…ILYOREASSI I@b1:nIn1-a-YA,AW1^ r».re1 from 3) The signal from the transformer is rectified and filtered by the "brute force" power supply (BFPS) board. Predict the expected peak voltage to ground of the output of the rectifier for both transformer settings. Predict the ripple of the filter output of BFPS ACin for a 12 ohm load. Assume C-bulk (see figure) is a 47mF filter capacitor and line input frequency of -ITP3 D1 60Hz. The marked TP connections are banana plugs connectors. Brute Force Power Supply -TP2 ACin C1 Cbulk D3 D4 of

Explanation / Answer

Input voltage = 120 Vrms

Transformaer ratio given is 1:10 and 1:20, So Vout = 1200 Vrms and 2400 Vrms

For bridge rectifier, Vrms = Vmax / (square root of 2)

Output voltage , Vout = (square root of 2) * Vrms which gives Vout = 1697.05 Volts and 3394.1 Volts.

For Bridge rectifiers, Outpur ripple voltage is given by , Vripple = IL / ( C* f) i.e., Load current / ( load capacitance * Frequency)

IL is given by Maximum output voltage / Load resistance ;

Vripple = 1697.05 / ( 12*60*4.7 * 10 -3) and 33974.1 / (12*60*4.7 * 10 -3)

= 501.49 volts for 1:10 transformer and 1002.98 volts for 1:20 transformer.

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