OTP AC AC EMI Filter Transformer AC to DC Bridge Rectifier with Series Pass Transistor OCP/OVP (50Hz) capacitor Filter Variable Reference Voltage ↑ Operational Amplifier Figure 1 Block diagram of an AC powered desktop regulated linear power supply
1. Explain the principle of operation of Figure 1. Derive the equations
that govern each block of the circuit.
2.Define the features and technical specifications based on Figure 1
requirement.
3.Design the high voltage side circuits and state equation(s) (that was
derived in question 1) to justify the values used in your calculation.
Specify practical values or actual component part number with
reference from real worldwide components.
4. Design the low voltage side circuits and include equations to justify
the values used in your calculation. Specify practical values or actual
component part numbers with reference from real worldwide
components. Include any heatsink calculation when required to ensure
semiconductors do not overheat and keep the junction temperature
below 125 degree Celsius.
5. Simulate, using CAD software, the low voltage side circuit to see its
regulation. (Submit the simulation file together with the report.)
a. Plot the output voltage (with its ripple voltage at no load condition)
b. Determine the load and line regulations from the simulation.
6. Include in your design advanced features such as OVP, OCP and
OTP. and include equations to justify the values used in your
calculation. Specify practical values or actual component part numbers
with reference from real worldwide components.
7. Draw the complete circuit design with all values specified.
8. To reduce the power dissipation on the linear (low voltage side)
circuit, suggest one design to implement with a DC-DC switching
concept to replace the linear series pass transistor design.
9. State what are the safety pre-cautions if the prototype is to be tested
in the lab. State the relevant regulatory standards (e.g. Safety,
Emission, Immunity, Performance) required to bring the product to the
USA market.
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