Analysis Module

Analysis code for wireless power transfer systems.

class wpt_tools.analysis.nw_tools

Bases: object

Class for analyzing wireless power transfer systems based on touchstone (.snp) files.

nw

Network object representing the touchstone file.

Type:

skrf.network.Network

f_narrow_index_start

(Description of f_narrow_index_start)

Type:

type

f_narrow_index_stop

(Description of f_narrow_index_stop)

Type:

type

target_f_index

(Description of target_f_index)

Type:

type

sweeppoint

Sweep points in the frequency range of the network.

Type:

numpy.ndarray

range_f

(Description of range_f)

Type:

type

target_f

(Description of target_f)

Type:

type

efficiency_load_analysis(rx_port=2, show_plot=1, show_data=1)

Perform efficiency and optimal load analysis (for general 2-port networks).

The function is unstable when far from the resonant frequency. Reference: Y. Narusue, et al., “Load optimization factors for analyzing the efficiency of wireless power transfer systems using two-port network parameters,” IEICE ELEX, 2020.

Parameters:

• rx_port (int, optional) – The port to receive on, either 1 or 2 (default is 2).

• show_plot (int, optional) – Whether to show a plot of the analysis (default is 1).

• show_data (int, optional) – Whether to print data from the analysis (default is 1).

Returns:

• max_f_plot (float) – Frequency at maximum efficiency.

• max_eff_opt (float) – Maximum efficiency.

• max_r_opt (float) – Optimum resistance for maximum efficiency.

• max_x_opt (float) – Optimum reactance for maximum efficiency.

Raises:

SystemExit – If the method ‘set_f_target_range’ was not executed before this operation.

import_touchstone(filename)

Load touchstone file into the network.

Parameters:

filename (str) – Name of the touchstone file.

Raises:

ValueError – If filename is not provided or the file does not exist.

optimal_load_plot(min_rez, min_imz, max_rez, max_imz, step_rez, step_imz, input_voltage, rx_port=2)

plot_z_full()

plot_z_narrow_fit(show_plot=1, show_fit=1)

rxc_filter_calc(rx_port, rload, c_network='CpCsRl')

set_f_target_range(target_f, range_f)

Set the target frequency range for the analysis.

This attempts to find an index range close to the target frequency with a given range. The closest frequency is stored in self.target_f_index.

Parameters:

• target_f (float) – Target frequency.

• range_f (float) – The frequency range centered around the target frequency.

Note

This method relies on previously imported frequencies via the import_touchstone method. If no frequency data is found, this function does nothing.