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ltspice_pytool

★ 124 Open GitHub ↗

Spice data analysis tool for python

// repository documentation

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# LTSpice data parsing library for python

## Installation

```sh
$ pip install ltspice
```

## Supported Files
* encoding : UTF8 / UTF16-LE
* format : Binary / Ascii
* extenstion : .raw / .fft

## Usage

```python
import ltspice
filepath = 'Your ltspice output file (.raw)'
l = ltspice.Ltspice(filepath)
l.parse() # Data loading sequence. It may take few minutes for huge file.

time = l.get_time()
V1 = l.get_data('V(N1)')
```

## Examples

### 01 - RC Circuit

#### LTSpice file (.asc)

#### Python code (.py)

```python
import ltspice
import matplotlib.pyplot as plt
import numpy as np
import os

l = ltspice.Ltspice(os.path.dirname(__file__)+'\\rc.raw') 
# Make sure that the .raw file is located in the correct path
l.parse()

time = l.get_time()
V_source = l.get_data('V(source)')
V_cap = l.get_data('V(cap)')

plt.plot(time, V_source)
plt.plot(time, V_cap)
plt.show()
```

#### Output result
<img src="https://github.com/DongHoonPark/ltspice_pytool/blob/master/examples/01_RC/rc.png?raw=true" width="500">

### 02 - Multi point simulation

#### LTSpice file (.asc)
<img src="https://github.com/DongHoonPark/ltspice_pytool/blob/master/examples/02_Rectifier/rectifier.jpg?raw=true" width="500">

#### Python code (.py)

```python
import ltspice
import matplotlib.pyplot as plt
import numpy as np
import os

l = ltspice.Ltspice(os.path.dirname(__file__)+'\\rectifier.raw') 
# Make sure that the .raw file is located in the correct path
l.parse()

time = l.get_time()
V_source = l.get_data('V(source)')
V_cap_max = []

plt.plot(time, V_source)
for i in range(l.case_count): # Iteration in simulation cases 
    time = l.get_time(i)
    # Case number starts from zero
    # Each case has different time point numbers
    V_cap = l.get_data('V(cap,pgnd)',i)
    V_cap_max.append(max(V_cap))
    plt.plot(time, V_cap)

print(V_cap_max)

plt.xlim((0, 1e-3))
plt.ylim((-15, 15))
plt.grid()
plt.show()

```

#### Output result

```sh
$ [8.299080580472946, 7.855469107627869, 7.391375303268433, 6.944645524024963, 6.529755532741547]

```

If you want to find more usage examples, please check examples folder.

####

ltspice_pytool

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