General Purpose Power Electronic Converter

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Team Name Power-panda
Duration Spring 2018 - Fall 2018
Faculty Advisor

Team Members
  • Zhongdi Wang
  • Xinyu wu
  • Lyle Lair

Problem Definition[edit]


Converters are a commonly used device within many electronic systems that allow the voltage of the device to operate in an area with a different voltage. This functionality is increasingly important in many technologies today since electronic devices often contain multiple sub-circuits where each circuit may have different voltage requirements than each other to include the main power supply. A well-known example of this is within portable electronic devices, such as cellphones, tablets, and laptop computers.

Desired Goals[edit]

For our project, the design goal is to develop a converter system that utilizes four traditional converters and combines their outputs to push a higher, more efficient output while lowering the cost of high power converter system; ideally four, 60 kW converters as a single, 0.25 MW system.

Desired Specifications[edit]

• input: ranged dependent on local power supplies available – 120 V - 400 V Direct Current or Alternating Current (DC or AC)
• Output: fixed set value as established based on need. – 120 V, 240 V 400 V DC or AC
• Must have at least 4 traditional converter modules
• Efficiency must be greater than 90.0 %
• Although size is not specified, a smaller system would be preferred.

Project Design Procedure[edit]

1. We need to investigate the different types of DC-DC converters to know their characteristics.
2. We need to build a simulation schematic of a single converter module
3. We need to build a simulation schematic of an integrated converter module.
4. We need to find the relationship between efficiency and load currents for control algorithm from the simulation schematic.
5. Develop the software to automate the optimization function of the combined converter modules
6. Meanwhile, we need to design a PCB for our schematic. Also, we need to make a specific budget to buy components.
7. We need to build the PCBs and test them step by step.
8. When the hardware is finished. Hardware builder will give these PCBs to Control Algorithm designer to improve his Algorithm.

Project Specifications[edit]

To implement the desired specifications into such a system, it was determined that by developing a lower power equivalent of the system, the control scheme of the system could be created and then scaled-up so that the desired goal could be attained. In agreeance with the client, the new project specifications are as follows:

• Input: range dependent on available power sources – 12 VDC to 36 VDC
• Output: fixed at a single voltage of 24 VDC
• Must have at least four traditional converter modules
• Efficiency must be greater than 94.0 %
• Optional: Small System preferred.



Figure 1.Circuit of Forward-Converter

Calculation Part[edit]

Design Requirement[edit]

• Minimum Input Voltage Value: Vinmin = 12 V
• Maximum Input Voltage Value: Vinmax=36V
• Output Voltage Value: Vout=24V
• Pout=100W Efficiency >=94%

Important values Calculation[edit]

• Output Current: Iout=Pout/Vout=4.176 A Rload=Pout/Iout2 = 5.76Ω

Np-s= 1/3 Remarks: on the schematic, the ratio transformer is 300u : 2.7m. When we use set transformers in LTspice, (1:x) must be transformed into (1:x2).


VOUT(TARGET) = 24V Rset = 33333.33Ω Vset= Rset x 20uA= 0.6667V


Duty cycle[edit]

D=(12 x 0.6667V)/24V = 0.33335



Set tss= 2ms ,Css= 50nFx(tss/1ms)=100nF



Set Rt= 49.9kΩ Frequency =200KHz



R4/R5 = (24V/1.6)-1= 14 : 1

Secondary Part Component Value[edit]


⊿Vc = 0.24V , ⊿ iIx = 8.352A

Lx, min = 9.579uH  minimum Inductor value 
Cx, min = 27.69uF Minimum Capacitor value

Other Components Values[edit]


CDFILT: Np/Ns=1/3, L1 = 50uH, CL=60uF CDFILT,min=9.1287x1010F


Set |Vref|=1.6V Cc=4.7nF,Rsense= 0.0025 Ω RZ,min = 3995Ω

Simulation Results[edit]


..........................................................................figure(1). simulation result value of every component.............................................................................................


the picture shows output voltage that the x-coordinate is time, and the y-coordinate is voltage,and it is almost getting close to 24V that is what we want to achieve purpose.



..................................This is our PCB board................................

Project Budget[edit]

Pricing for Design[edit]

Team Information[edit]

Zhongdi Wang:

Major: Electrical Engineering
Graduation Date: December 12, 2018
Hobbies: Boating, Carpentry, Skiing, Raising Honeybees and Chickens, Camping, Family time
Responsibilities: The organizer of meeting and project leader


Xinyu Wu(kobe):

Major: Electrical Engineering
Graduation Date: December 12, 2018
Hobbies: basketball, eating, Listening to Music
Responsibilities: Wiki Manager

Lyle Lair:

Major: Electrical Engineering
Graduation Date:


Responsibilities: The primary client contact and Project vice Leader


Document Archive[edit]

Other Documents[edit]

Content of meeting[edit]

Project Schedule[edit]

Project Schedule

Design Report[edit]

Design Review Presentation[edit]