Servo supply issue: Difference between revisions
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It looks like this: | It looks like this: | ||
[[file:servo_power_shutdown.png | 500px]] | [[file:servo_power_shutdown.png | 500px]] | ||
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With 33uF capacitor (Diode is 1A3 from DC components) | With 33uF capacitor (Diode is 1A3 from DC components) | ||
[[file:servo_power_diode+33uf.png | 500px]] | [[file:servo_power_diode+33uf.png | 500px]] | ||
Orange is the input voltage; Blue is after the diode. | |||
This looks good, but the overvoltage is high (>2V) | This looks good, but the overvoltage is high (>2V) | ||
=== 5V protection | === 5V protection 130uF === | ||
A series diode followed by a capacitor, in the 5V supply line. | A series diode followed by a capacitor, in the 5V supply line. | ||
With 130uF capacitor (Diode is 1A3 from DC components) | With 130uF capacitor (Diode is 1A3 from DC components) | ||
[[file:servo_power_diode133uf.png | 500px]] | [[file:servo_power_diode133uf.png | 500px]] | ||
Orange is the input voltage; Blue is after the diode. | |||
This looks good, but the overvoltage is now ~1V, and that should be OK. | This looks good, but the overvoltage is now ~1V, and that should be OK. | ||
Latest revision as of 19:12, 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)
Orange is the input voltage; Blue is after the diode.
This looks good, but the overvoltage is high (>2V)
5V protection 130uF
A series diode followed by a capacitor, in the 5V supply line.
With 130uF capacitor (Diode is 1A3 from DC components)
Orange is the input voltage; Blue is after the diode.
This looks good, but the overvoltage is now ~1V, and that should be OK.
