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heaters: Fix no heating on small max_power values (#7227)

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If the config parameter "max_power" is less than 0.05, the heaters will never start heating. Added PWM threshold scaling with "max_power" value.

Signed-off-by: Maksim Bolgov <maksim8024@gmail.com>
This commit is contained in:
Maksim Bolgov
2026-03-20 18:19:45 +02:00
committed by GitHub
parent 0021798795
commit 01f089e710
1 changed files with 3 additions and 1 deletions
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4
klippy/extras/heaters.py
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@@ -16,6 +16,7 @@ AMBIENT_TEMP = 25.
PID_PARAM_BASE = 255.
MAX_MAINTHREAD_TIME = 5.0
QUELL_STALE_TIME = 7.0
MIN_PWM_CHANGE_RATIO = 0.05
class Heater:
def __init__(self, config, sensor):
@@ -37,6 +38,7 @@ class Heater:
is not None)
self.can_extrude = self.min_extrude_temp <= 0. or is_fileoutput
self.max_power = config.getfloat('max_power', 1., above=0., maxval=1.)
self.min_pwm_change = self.max_power * MIN_PWM_CHANGE_RATIO
self.smooth_time = config.getfloat('smooth_time', 1., above=0.)
self.inv_smooth_time = 1. / self.smooth_time
self.verify_mainthread_time = -999.
@@ -71,7 +73,7 @@ class Heater:
if self.target_temp <= 0. or read_time > self.verify_mainthread_time:
value = 0.
if ((read_time < self.next_pwm_time or not self.last_pwm_value)
and abs(value - self.last_pwm_value) < 0.05):
and abs(value - self.last_pwm_value) < self.min_pwm_change):
# No significant change in value - can suppress update
return
pwm_time = read_time + self.pwm_delay