Erweiterte LED-Vorwiderstand & Leistungsverlustberechnung mit Python

# Konfigurationsparameter
from UliEngineering.Electronics.LED import *
from UliEngineering.Electronics.Resistors import *
from UliEngineering.EngineerIO import *

### BEGINN DER KONFIGURATION ###
desired_led_current = "8mA"
vsupply = "3.3V"
vforward_min = "1.8V"
vforward_max = "2.4V"
# Typische Durchlassspannung ist oft der Durchschnitt von min und max
# (oder du kannst einen spezifischen typischen Wert eingeben, falls du einen hast)
vforward_min_val = normalize_numeric(vforward_min)
vforward_max_val = normalize_numeric(vforward_max)
vforward_typ_val = (vforward_min_val + vforward_max_val) / 2
vforward_typ = f"{vforward_typ_val}V"
tolerance = "1%" # typisch 1% oder 5%
# Wähle, ob der nächsthöhere oder niedrigere Standardwiderstandswert ausgewählt wird
# ("higher" ergibt weniger Strom, "lower" ergibt mehr Strom)
higher_or_lower_resistor = next_higher_resistor
### ENDE DER KONFIGURATION ###

print(f"LED Series Resistor calculation for a LED with Vf min..typ..max: {vforward_min}..{vforward_typ}..{vforward_max}")
print()

# Hilfsfunktion: Liste der Durchlassspannungen (min, typ, max)
vforward_vals = [vforward_min_val, vforward_typ_val, vforward_max_val]

# Ideale Vorwiderstände für min-, typ- und max-Durchlassspannungen berechnen
series_resistors = [led_series_resistor(vsupply, desired_led_current, vf) for vf in vforward_vals]
# Widerstandswerte für kompakte Ausgabe vorformatieren
series_resistors_fmt = [format_value(r, 'Ω') for r in series_resistors]
print(f"Ideal LED series resistor for {vsupply} and {desired_led_current}: {series_resistors_fmt[0]}..{series_resistors_fmt[1]}..{series_resistors_fmt[2]}")

# Leistungsverlust des idealen Widerstands für jede Durchlassspannung
powers_ideal = [led_series_resistor_power(vsupply, desired_led_current, vf) for vf in vforward_vals]
# Leistungswerte für kompakte Ausgabe vorformatieren
powers_ideal_fmt = [format_value(p, 'W') for p in powers_ideal]
print(f"Power dissipated by the ideal series resistor: {powers_ideal_fmt[0]}..{powers_ideal_fmt[1]}..{powers_ideal_fmt[2]}")

# Nächsthöheren Standard-E24-Widerstandswert ermitteln
print()
# Standardwiderstand basierend auf dem TYPISCHEN (mittleren) idealen Wert wählen
standard_series_resistor = higher_or_lower_resistor(series_resistors[1], sequence=e24)
standard_series_resistor_fmt = format_value(standard_series_resistor, 'Ω')
print(f"Next standard resistor value: {standard_series_resistor_fmt}")

# Tatsächlichen Strom durch LED & Vorwiderstand für min..typ..max bei Auswahl des nächsten Standardwiderstands berechnen
standard_currents = [led_series_resistor_current(vsupply, standard_series_resistor, vf) for vf in vforward_vals]
# Ströme für kompakte Ausgabe vorformatieren
standard_currents_fmt = [format_value(I, 'A') for I in standard_currents]
print(f"Current through the LED & series resistor: {standard_currents_fmt[0]}..{standard_currents_fmt[1]}..{standard_currents_fmt[2]}")

# Tatsächlichen Leistungsverlust im ausgewählten Standardwiderstand für jede Durchlassspannung berechnen
standard_powers = [power_dissipated_in_resistor_by_current(standard_series_resistor, I) for I in standard_currents]
# Pre-format powers for concise printing
standard_powers_fmt = [format_value(p, 'W') for p in standard_powers]
print(f"Power dissipated by the {standard_series_resistor_fmt} series resistor: {standard_powers_fmt[0]}..{standard_powers_fmt[1]}..{standard_powers_fmt[2]}")

# Maximal zulässigen Strom für den Vorwiderstand berechnen
max_current = led_series_resistor_maximum_current(resistance=standard_series_resistor, power_rating="250mW")
print(f"Maximum permissible current for the {standard_series_resistor_fmt} series resistor: {format_value(max_current, 'A')}")

# Leistungsverlust berechnen, wenn der Widerstand am unteren oder oberen Ende seiner Toleranz liegt
print()
# Toleranzgrenzen ermitteln
tolerance_bounds = resistor_tolerance(resistance=standard_series_resistor, tolerance=tolerance)
lowest_resistor_value = tolerance_bounds.lower
highest_resistor_value = tolerance_bounds.upper
lowest_resistor_value_fmt = format_value(lowest_resistor_value, 'Ω')
highest_resistor_value_fmt = format_value(highest_resistor_value, 'Ω')

# Unteres Ende (kleinerer Widerstand -> höherer Strom)
print(f"If the {standard_series_resistor_fmt} resistor is at the lower end of its {tolerance} tolerance ({lowest_resistor_value_fmt}):")
lowest_resistor_currents = [led_series_resistor_current(vsupply, lowest_resistor_value, vf) for vf in vforward_vals]
lowest_resistor_currents_fmt = [format_value(I, 'A') for I in lowest_resistor_currents]
print(f"Current through the LED & {lowest_resistor_value_fmt} series resistor: {lowest_resistor_currents_fmt[0]}..{lowest_resistor_currents_fmt[1]}..{lowest_resistor_currents_fmt[2]}")
lowest_resistor_powers = [power_dissipated_in_resistor_by_current(lowest_resistor_value, I) for I in lowest_resistor_currents]
lowest_resistor_powers_fmt = [format_value(p, 'W') for p in lowest_resistor_powers]
print(f"Power dissipated by the {lowest_resistor_value_fmt} series resistor: {lowest_resistor_powers_fmt[0]}..{lowest_resistor_powers_fmt[1]}..{lowest_resistor_powers_fmt[2]}")

# Oberes Ende (größerer Widerstand -> niedrigerer Strom)
print()
print(f"If the {standard_series_resistor_fmt} resistor is at the upper end of its {tolerance} tolerance ({highest_resistor_value_fmt}):")
highest_resistor_currents = [led_series_resistor_current(vsupply, highest_resistor_value, vf) for vf in vforward_vals]
highest_resistor_currents_fmt = [format_value(I, 'A') for I in highest_resistor_currents]
print(f"Current through the LED & {highest_resistor_value_fmt} series resistor: {highest_resistor_currents_fmt[0]}..{highest_resistor_currents_fmt[1]}..{highest_resistor_currents_fmt[2]}")
highest_resistor_powers = [power_dissipated_in_resistor_by_current(highest_resistor_value, I) for I in highest_resistor_currents]
highest_resistor_powers_fmt = [format_value(p, 'W') for p in highest_resistor_powers]
print(f"Power dissipated by the {highest_resistor_value_fmt} series resistor: {highest_resistor_powers_fmt[0]}..{highest_resistor_powers_fmt[1]}..{highest_resistor_powers_fmt[2]}")

LED Series Resistor calculation for a LED with Vf min..typ..max: 1.8V..2.1V..2.4V

Ideal LED series resistor for 3.3V and 8mA: 187 Ω..150 Ω..112 Ω
Power dissipated by the ideal series resistor: 12.0 mW..9.60 mW..7.20 mW

Next standard resistor value: 150 Ω
Current through the LED & series resistor: 10.00 mA..8.00 mA..6.00 mA
Power dissipated by the 150 Ω series resistor: 15.0 mW..9.60 mW..5.40 mW
Maximum permissible current for the 150 Ω series resistor: 40.8 mA

If the 150 Ω resistor is at the lower end of its 1% tolerance (148 Ω):
Current through the LED & 148 Ω series resistor: 10.1 mA..8.08 mA..6.06 mA
Power dissipated by the 148 Ω series resistor: 15.2 mW..9.70 mW..5.45 mW

If the 150 Ω resistor is at the upper end of its 1% tolerance (152 Ω):
Current through the LED & 152 Ω series resistor: 9.90 mA..7.92 mA..5.94 mA
Power dissipated by the 152 Ω series resistor: 14.9 mW..9.50 mW..5.35 mW