OV-Filter

OV filter

The power supply in a motorbike is generally specified as 12 volts. Normally, however, the supply voltage is anything but 12 volts. When the battery is almost flat, the voltage sometimes drops below 11 volts. When the battery is being charged, the supply voltage rises to approx. 14.4 volts. In addition, the following effects occur:

- The ignition produces approx. 20000 - 30000 volts, which means that narrow needle pulses of up to 100 volts or more can be measured on the cables. These pulses are narrow and have a very low energy density. However, these overvoltages are often sufficient to destroy parts of the electronics after some time.

- All inductivities in the moped generate a negative voltage the moment they are switched off. Although this voltage is only of short duration, it can reach minus 20 - 30 volts in the starter motor, for example, which can also destroy parts of the electronics.

The OV filter smoothes the supply voltage and short-circuits all pulses above 18 volts, thus protecting the connected electronics. In addition, negative pulses are short-circuited via a Schottky diode. As the OV filter is clamped between plus and minus, a 15 ampere fuse is also integrated to prevent short-circuiting the battery in the event of a fault.