Question

Design and simulate a regulated power supply using a bridge rectifier, capacitors, and zener diode ( no integrated circuit). The source voltage is 110 plus or minus 10 Vrms, 60 Hz frequency. The output voltage is as follows (plus or minus 5%) : 4.5 V and 12 V

It has to be done on a breadboard. The rating of the adapter will be 12W and 5% regulation. To protect the circuit include a surge protection and fuse in the circuit design. The total cost of the components of the design should be less than $10. A total number of the elements should be less than 12 for reducing environmental impact. Test it on Multisim and breadboard. Please LIST each item that you used on the breadboard test exactly. I NEED YOU TO PERFORM IT ON A BREADBOARD as well as ON MULTISIM. SHOW the multilsim picture. SHOW ALL CALCULATIIONS NEATLY! DO NOT WRITE IN PEN OR CURSIVE! THANK YOU!

Answer 1

As Bride rectifier is the device which is used to rectify means converts a.c into d.c.

Capacitor here work to store the charge. It can store energy in the form of 1/2 *c*v^2.

Zener Diode operate in the forward bias only.It is a form of semiconductor diode in which at a critical reverse voltage a large reverse current can flow.

As the output voltage is as follows : 4.5V and 12 V

So, we must use the voltage regulator to regulate the voltage. if we require the voltage of 12 V from 230 V than we can use the 7805 Voltage Regulator.

The rating of the adapter will be 12W and 5% regulation. To protect the circuit include a surge protection and fuse in the circuit design. As it is required.

Yes, the total cost would be below $10.

As the cost follows:

Breadboard:1.5$

Fuse and other elements also cost very less.

As you are operating the circuit on 12V than it is environmental friendly. This do not any environmental degradation.

Zero voltage cross detection means the supply voltage waveform that passes through zero voltage for every 10msec of a 20msec cycle. We are using 50Hz ac signal, the total cycle time period is 20msec (T=1/F=1/50=20msec) in which, for every half cycle (i.e. 10ms) we have to get zero signals. This is achieved by using pulsating dc after the bridge rectifier before being filtered. For that purpose we are using a blocking diode D3 between pulsating dc and the filter capacitor so that we can get pulsating DC for use. The pulsating DC(as shown in fig.2.4) is given to potential divider of 6.8k and 6.8K to deliver an output about 5V pulsating from 12V pulsating which is connected to non inverting input of comparator pin 3. Here Op-amp is used as comparator.

The analytical aspects mostly has been carried out to understand the behavior and to decide the ratings. The calculated values have been adjusted to nearly available / viable component rating. The simulation has been carried out in SIMULINK etc. Further, the developed working model has been tested component and module wise as applicable for hardware troubleshooting. The multi-meter / CRO have been used and hardware is tested in Power Electronics Laboratory