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Tip res =0 protection

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This commit is contained in:
Ben V. Brown
2022-07-07 22:07:48 +10:00
parent 41dee449ce
commit a24d0ff44f
1 changed files with 6 additions and 2 deletions
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8
source/Core/Src/power.cpp
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@@ -48,8 +48,12 @@ uint32_t availableW10(uint8_t sample) {
// P = V^2 / R, v*v = v^2 * 100 // P = V^2 / R, v*v = v^2 * 100
// R = R*10 // R = R*10
// P therefore is in V^2*100/R*10 = W*10. // P therefore is in V^2*100/R*10 = W*10.
uint32_t v = getInputVoltageX10(getSettingValue(SettingsOptions::VoltageDiv), sample); // 100 = 10v uint32_t v = getInputVoltageX10(getSettingValue(SettingsOptions::VoltageDiv), sample); // 100 = 10v
uint32_t availableWattsX10 = (v * v) / getTipResitanceX10(); uint32_t tipResistance = getTipResitanceX10();
if (tipResistance == 0) {
return 100; // say 100 watt to force scale down
}
uint32_t availableWattsX10 = (v * v) / tipResistance;
// However, 100% duty cycle is not possible as there is a dead time while the ADC takes a reading // However, 100% duty cycle is not possible as there is a dead time while the ADC takes a reading
// Therefore need to scale available milliwats by this // Therefore need to scale available milliwats by this