[DigiKey "Smart Manufacturing, Non-stop Happiness" Creative Competition] - Current Conversion Circuit Simulation

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This chapter is used to explain the circuit for converting 2V signal to 0.2A output function.

There are many simulation software for analog circuits, such as Pspice and Saber, which are said to be easy to use, but they are charged. For a novice like me, I don’t need very powerful and stable functions, but only simple operations and the ability to simulate results. The performance indicators are not very high, so I chose LTspice software from ADI. The software is labeled Linear Technology, which has been acquired by ADI. Since ADI acquired Linear Technology and Maxim, the prices of ADC and DAC have risen by several levels. Is this the legendary monopoly that can control prices? It has hurt electronic enthusiasts like me. Of course, in addition to LTspice, you can also use TINA-TI from TI. I have never used it, so I will no longer consider this software. I used Multisim when I was in school. Multisim is from National Instruments (NI) Co., Ltd. of the United States and needs to be cracked.

After comprehensive consideration, I used LTspice software. Many components were not available, so I could use similar substitutes and see what components I had on hand. I had bought some before but have not used them yet, so this is an opportunity.

Turning to simulation, the first step is to download the LTspice software from the official website. The software is less than 70MByte, and it varies depending on the version, so the software is still quite small.

At first, I was not used to the software. I needed to explore, create a new file, find +15V and -15V power supplies, assemble them with two 15V-DC power supplies, and then find op amps and transistors according to the circuit diagrams on the Internet. I used whatever was in the software library. To change the parameters of the components, you need to right-click and then the interface settings will pop up.

Simulation run settings: Click the menu "Simulate" and the following interface will pop up. Set the Stop time in seconds and set the maximum simulation step Maximum Timestep.

The circuit schematic is as follows:

After the circuit is built, run Run under "Simulate" and wait for the simulation to end. The simulation time must be set appropriately. For example, if the input signal is 50Hz, you only need to set the stop time to 100mS. If you want to view the waveform of a certain point, you can move the cursor to it. Generally, if you click on the resistor, a circle will appear, which is similar to measuring current. If you click on the line, it is generally testing the voltage signal. Here we only care about the current signal of R6, and its test results are introduced in the picture below.

100mA DC output signal

50Hz 100mA (amplitude) AC current signal

500Hz 100mA (amplitude) AC current signal

qwqwqw2088

Is this a waveform simulated using LTspice software?

Are the two waveforms of 50Hz 100mA (amplitude) AC current signal and 500Hz 100mA (amplitude) AC current signal posted in the wrong picture?

chejm

First of all, I would like to praise the OP, save it, study it slowly, and give it a thumbs up

lansebuluo

qwqwqw2088 Published on 2023-11-25 18:41 Is this the waveform simulated by LTspice software? 50Hz 100mA (amplitude) AC current signal and 500Hz 100mA (amplitude) AC current signal two waves...

There is no mistake in posting it. This should be correct. The description is on the top and the picture is on the bottom. There are time marks on the picture.