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Raise PWM frequency 

Adjusting PWM frequencies to better match FDD8780, WSK220N04 and VS40200ATD MOSFET spec.

- Heater PWM frequency increased from 7.6294 Hz to 30.5176 Hz
– Referencing the Forward Bias Safe Area from the MOSFET's datasheets, this value should be safer.
- Use software PWM for fans to reduce whine
– The higher PWM frequency works well with the stock parts cooling fan and might allow for better control of third party fans
This commit is contained in:
David Ramiro 2019-03-24 18:30:53 +01:00
parent bf8b6729b2
commit 589e972102
No known key found for this signature in database
GPG Key ID: 5B042737EBEEB736
1 changed files with 10 additions and 10 deletions
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20
Marlin/Configuration.h
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@ -379,10 +379,10 @@
// If you are using a pre-configured hotend then you can use one of the value sets by uncommenting it
// i3 Mega
#define DEFAULT_Kp 15.94
#define DEFAULT_Ki 1.17
#define DEFAULT_Kd 54.19
// i3 Mega stock v5 hotend, 40W heater cartridge (3.6Ω @ 22°C)
#define DEFAULT_Kp 18.58
#define DEFAULT_Ki 1.38
#define DEFAULT_Kd 62.40
// Ultimaker
//#define DEFAULT_Kp 22.2
@ -436,10 +436,10 @@
//#define PID_BED_DEBUG // Sends debug data to the serial port.
//Anycubic i3 Mega 160W Ultrabase
#define DEFAULT_bedKp 251.78
#define DEFAULT_bedKi 49.57
#define DEFAULT_bedKd 319.73
//Anycubic i3 Mega Ultrabase (0.9Ω @ 22°C)
#define DEFAULT_bedKp 187.45
#define DEFAULT_bedKi 35.75
#define DEFAULT_bedKd 245.71
//120V 250W silicone heater into 4mm borosilicate (MendelMax 1.5+)
//from pidautotune
@ -1827,13 +1827,13 @@
// Use software PWM to drive the fan, as for the heaters. This uses a very low frequency
// which is not as annoying as with the hardware PWM. On the other hand, if this frequency
// is too low, you should also increment SOFT_PWM_SCALE.
//#define FAN_SOFT_PWM
#define FAN_SOFT_PWM
// Incrementing this by 1 will double the software PWM frequency,
// affecting heaters, and the fan if FAN_SOFT_PWM is enabled.
// However, control resolution will be halved for each increment;
// at zero value, there are 128 effective control positions.
#define SOFT_PWM_SCALE 0
#define SOFT_PWM_SCALE 2
// If SOFT_PWM_SCALE is set to a value higher than 0, dithering can
// be used to mitigate the associated resolution loss. If enabled,