Through we could find the existing circuit diagram on the Internet, my partner and I still decided to design our own circuit, even it will contain any problems. After searching many materials and master the basic knowledge of a regulated power supply, we started to draw our first design.
Firstly, we determined to devise every important part of the whole circuit and combine them together to run after the simulation of every part works correctly.
Now, I will show you every step of our design.
Step 1. Simulate the part as power supply
From the right simulation figure, it can be found that a sinewave with amplitude at about 2 Volts is shifted upward by 5 Volts. It shows the combined two power supply can provide the expected input voltage. However, it disappears a problem：the output AC signal always shifts to the left, that means, the phase of the mixed power supply always changes.
Step 2. Invert the orignall signal and mix all signals
This step is to mix the original signal from source power and the inverting signal processed by the operational amplifier. If the two signals can be completely offset, then the output voltage ought to be a straight line at zero voltage, and that means, the designed circuit is reasonable to invert the original signal. From the below simulation diagram, it shows the output verify our thinking.
Step 3. Solve shifting-phase problem and filter DC signal
From the right simulation diagram, V1 is the signal voltage from the sources and V0 is the output voltage filtered by two capacitors. They just have 5 volts in difference without any phase difference.
Step 4. Connect the inverting amplifier to the filtered DC signal circuit
Step 5. Use transistor package to adjust and amplify the filtering DC signal
Step 6. Finally regulate and filter output voltage
Step 7. Combine all the parts together
Step 8. Modify the circuit
Step 9. Modify the design circuit again
Step 10. Change a little of the thinking of the design and draw the final draft
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