pecst 0.1.1

Capacitor Selection Toolbox for Power Electroincs.

Toolbox to select suitable foil capacitors for power electronics applications.

1 Installation

pip install pecst

2 Documentation

Capacitor input parameters:

• maximum_peak_to_peak_voltage_ripple

• current_waveform_for_op_max_current

• v_dc_for_op_max_current

• temperature_ambient

• voltage_safety_margin_percentage

• capacitor_type_list=[cst.CapacitorType.FilmCapacitor]

• maximum_number_series_capacitors

• capacitor_tolerance_percent

• lifetime_h

Features:

• calculating capacitors in series needed considering lifetime, voltage_safety_margin_percentage and temperautre_ambient according to datasheet curves

• calculating capacitors in parallel needed considering minimum required capacitance according to the given current waveform and maximum_peak_to_peak_voltage_ripple

• calculating capacitors in parallel needed considering maximum dv/dt per capacitor according to datasheet curves

• calculating capacitors in parallel needed considering the maximum current ratings per frequency (FFT) according to datasheet curves

• power loss calculation according to FFT current waveform with frequency-dependent ESR according to datasheet curves

• temperature rise calculation according to power loss and the capacitors thermal resistance according to datasheet curves

• volume calculation of the final setup

• calculating component cost regarding component cost models

• sort out non-working designs

Output:

• Performance space values: volume, power loss, cost

3 Quick start

• run the automated download of ESR files.

• run the Example capacitor selection file.