Servo supply issue: Difference between revisions
(Created page with "Back to Robobot_B == The 5V supply is OFF == The 5V servo supply may suddenly turn off. The issue is that when the servo stops, the extra energy is returned to the supply. The power supply enters shutdown mode when current flows in the reverse direction and can only be reset by a power cycle. It looks like this: 500px The Orange and blue are the servo power (5V), and the green is the control pulse to the servo. * The servo r...") |
|||
| Line 1: | Line 1: | ||
Back to [[Robobot_B]] | Back to [[Robobot_B]] | ||
== The 5V supply | == The 5V supply and X9MG == | ||
The 5V servo supply may suddenly turn off. | The 5V servo supply may suddenly turn off. | ||
| Line 15: | Line 15: | ||
* When it stops, the supply reaches above 6V. | * When it stops, the supply reaches above 6V. | ||
* After this, the 5V supply shut down. | * After this, the 5V supply shut down. | ||
=== 5V protection 33uF === | |||
A series diode followed by a capacitor, in the 5V supply line. | |||
With 33uF capacitor (Diode is 1A3 from DC components) | |||
[[file:servo_power_diode+33uf.png | 500px]] | |||
This looks good, but the overvoltage is high (>2V) | |||
=== 5V protection 100uF === | |||
A series diode followed by a capacitor, in the 5V supply line. | |||
With 130uF capacitor (Diode is 1A3 from DC components) | |||
[[file:servo_power_diode+133uf.png | 500px]] | |||
This looks good, but the overvoltage is now ~1V, and that should be OK. | |||
Revision as of 18:17, 24 January 2026
Back to Robobot_B
The 5V supply and X9MG
The 5V servo supply may suddenly turn off. The issue is that when the servo stops, the extra energy is returned to the supply. The power supply enters shutdown mode when current flows in the reverse direction and can only be reset by a power cycle.
It looks like this:
The Orange and blue are the servo power (5V), and the green is the control pulse to the servo.
- The servo runs for about 130ms, then stops.
- When it stops, the supply reaches above 6V.
- After this, the 5V supply shut down.
5V protection 33uF
A series diode followed by a capacitor, in the 5V supply line.
With 33uF capacitor (Diode is 1A3 from DC components)
This looks good, but the overvoltage is high (>2V)
5V protection 100uF
A series diode followed by a capacitor, in the 5V supply line.
With 130uF capacitor (Diode is 1A3 from DC components) File:Servo power diode+133uf.png
This looks good, but the overvoltage is now ~1V, and that should be OK.
