Presentation on theme: "Electronic Components1 Power Supply - Stage 1 n Mains voltage has to be reduced 1 - Transformation + - + - 120 V AC 30 V AC 4:1."— Presentation transcript:
Electronic Components1 Power Supply - Stage 1 n Mains voltage has to be reduced 1 - Transformation V AC 30 V AC 4:1
Electronic Components2 Power Supply - Stage 2 n Alternating voltage has to be converted to DC 2 - Rectification Half wave rectification Load 30 V AC 9.6 V DC
Electronic Components3 Power Supply - Stage 2 n Alternating voltage has to be converted to DC 2 - Rectification Half wave rectification Load -9.6 V DC 30 V AC
Electronic Components4 Power Supply - Stage 2 n Alternating voltage has to be converted to DC 2 - Rectification Full wave rectification RLRL 30 V AC 19.1 V DC
Electronic Components5 Power Supply - Stage 3 n Fluctuating voltage has to be smoothed 3 - Filtered RLRL R L = 5.1 k C = 33 F V out = 40V DC with 1V ripple
Electronic Components6 Power Supply - Stage 3 (Filtering) RLRL RSRS When first turned on capacitor acts as a short. The surge current can damage diodes. This can be reduced by adding a surge resistor.
Electronic Components7 Power Supply - Stage 3 (Filtering) RLRL A more effective (although more costly) way is to use an inductor to oppose the changes in current. The capacitors in the LC filter oppose changes in voltage.
Electronic Components8 Power Supply - Stage 4 n Voltage has to be smoothed further 4 - Regulation Zener diode gives constant base voltage. Thus base current is constant and so will be the collector and emitter currents. RLRL
Electronic Components9 Graymark 808 Power Supply n Power supply was built from a kit. n Has two V and one 5V n Also has three protoboards n Ideal for doing analogue and digital lab projects
Electronic Components10 Graymark Power Supply n Bottom plate shows transformer and circuit board Circuit Board Bottom plate Transformer
Electronic Components11 Graymark Power Supply n Circuit board Rectifier diodes IC regulator Filter capacitor