Electrical filter structure

An air cleaning method, where an air flow is created and which method comprises the steps of:

• in a charging unit, charging the particles to be filtered into a first electric potential before the particles enter filter elements,
• attracting the charged particles by electrically conducting electrodes connected to a second electric potential different from the potential of the charged particles and set substantially parallel to a path of the airflow,
• guiding the charged air through filter elements positioned after the charging unit in the path of the air flow, and
• directing UV-light in or close to each bag shaped filter element and placing photo catalytic material close to the UV-light.

A mobile filter unit comprising:

• a mobile communication device, and
• a filter unit connected to the mobile communication device, wherein the filter unit comprises:
• an air inlet,
• a fan for generating an air flow from behind of the mobile communication device,
• a high voltage unit for charging the air flow and particles in the air flow,
• TiO2-covered electrodes in the air flow connected to opposite polarity than the high voltage unit,
• UV-LEDs illuminating the TiO2-covered electrodes, and
• an outlet for the air flow directed towards of a user of the mobile communication device.