Week 4 Activity

Part 1: Power Amplifier Circuit

First we built power amplifier circuit. According to the instruction book, we knew we need to used two 1000μF capacitors connected with power amplifier. Then we inserted a resistor to measure the output signal.


According to the instruction book of power amplifier, it requires a symmetric DC power supply with an output range of 30 to 35V. In the experiment we provided a 30V DC power supply. 

After testing the power amplifier circuit, we put current transducer into the circuit but the result was incorrect. We decided to finish this part in next week.
Part 2: Theoretical voltage of coil

We estimated the ratio of number of turns to length 1cm. The estimated result is 21 turns per centimeter, so N/L=2100 (turns per meter). Then we measured the coil diameter by electronic digital caliper is 2.4mm so r=1.2mm. In the experiment, the signal frequency we used was 50kHz.

The calculation of coil theoretical voltage is following:


Part 3: Integrator circuit & amplifier circuit 

This week we continued to adjust integrator and amplifier circuit. We had finished the circuit but the output waveforms still exit problems.


Part 4: Summary and goals for next week 

This week we calculated theoretical voltage of the coil, built power amplifier, integrator and amplifier circuit. For next week, we will finish build the circuit and get corrected output waveform. We plan to connect each part together to form a completed rogowski coil circuit.

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Week 1 Activities

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Part 1: Preparations before the lab After getting all of the experiemnt components, the first step we did was to check the modle type of every components and search their properties and usage in the global circuit. We set a primary image of the rogowski coil circuit by looking up online materials and the circuit we decided to use is like: We dicided to wind the coil but we did not find a suitable material to wind it. Then we dicided to build the integrator circuit first. The integrator will be used to integrate the voltage generated by the coil in the global circuit. Part 2: Build the integrator circuit The following is our disigned circuit diagram and we built the integrator circuit according to the diagram. We chose several 10k ohm resistors and a 330k ohm resistor. The capacitor we used was 10nF, 100nF. The input AC voltage was 50kHz, 3V square waveform and DC input is 5V.  This is the circuit we built. We changed the resistance, capacitance and...
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Week 5 Activity

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Part 1: Finish integrator and amplifier circuit We found that the theoretical voltage of the coil calculated last week was wrong. The radius should not be the radius of the copper wire, it should be the radius of the coils. We measured the diameter of the coil was 2.4mm, using the same calculation steps as last week and the theoretical voltage should be 3.75*10^(-6). First we finished building the integrator circuit and got the expected output waveform. We changed the circuit diagram we used before. The final circuit of integrator was: The input signal was a 120mV, 50kHz square wave and the output signal was a -1.3V, 1.667 MHz triangle wave. The output signal was amplified by about 10.83 times.    (Integrator circuit) Then we built the amplifier circuit. We designed the voltage gain of the amplifier circuit is 1000. According to: G=1+50k/Rg, we calculated Rg=505.05 ohm. However, the output signal was opposite with what we expected. The output voltage wa...
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