Koninklijke Philips Corporation N.V.

Philips Intellectual Property & Standards Gmbh

Einte Holwerda

Declan Patrick Kelly

Koray Karakaya

Georg Greuel

Eva Mondt

Hendrik Richard Jousma

Jacob Dijkstra

Jean-Paul Jacobs

Jean Bart Bleeker

Timothy Van Der Graaf

Klaastinus Hendrikus Sanders

Jozeph Peter Karl Hoefsmit

Daiyu Hayashi

Klaas Van Der Vlist

Cornelis Reinder Ronda

Gerrit Willem Jan Ter Horst

Nicolaus Antonius Maria Koper

Pieter Weyert Lukey

An air purifier filter system comprises an air purifier filter unit and a machine readable identifier which provides information concerning the filter unit type and performance information specific to a target pollutant to be filtered by said air purifier filter unit from a plurality of different pollutants that can be filtered by that filter unit type. This information can be used to provide an end of life prediction for the filter unit or provide advice that the filter should be changed for other reasons. This enables the user to be given advance warning, and to be given instructions when it is time to change the filter unit. The instructions to change the filter unit may be more accurate than a simple timer as they can take account of the type of filter unit and the performance information. In some examples the use history of the filter unit may also be used to predict the time when it should be changed.

Air purifier filter system, an air purifier and a method for controlling an air purifier

An air purification system is provided which includes measurement of a concentration of a target pollutant within the air. A gas sensor is used for sensing a concentration of the pollutant (although it will detect other pollutants as well due to cross-sensitivity). A filter is provided which selectively removes the target pollutant while having a significantly smaller effect in reducing other pollutants to which the sensor is cross-sensitive. A gas sensor response is obtained before filtering, a gas sensor response after filtering, and the sensitivity characteristics of the gas sensor to the pollutant are processed, thereby to determine a gas concentration of the pollutant in the air before filtering. In this way, the concentration measurement is better than a direct measurement with the gas sensor as a result of a low selectivity of the gas sensor.

System and method for measuring a concentration of a pollutant within a gas

The invention relates to a semiconductor device with a diode. The semiconductor body ( ) comprises a stack of a first semiconductor region provided with a first connection conductor ( ) and a second semiconductor region ( ) connected to a second connection conductor ( ), wherein a rectifying junction is present between the two semiconductor regions ( ) having opposite conductivity types. Such a device is&mdash;after a rotation through 90 degrees&mdash;suitable for surface mounting. However, in particular at high voltage and/or high power levels, the diode may suffer from breakdown or a high leakage current. In a device according to the invention, a portion ( A) of the first semiconductor region ( ) is electrically insulated from the rest ( B) of the first semiconductor region ( ), the semiconductor body ( ) is provided with means ( ) by which said portion ( A) is connected with electrical conduction to the second semiconductor region ( ), and the second connection conductor ( ) is situated on said portion ( A) of the first semiconductor region ( ). The resulting device is directly suitable for surface mounting, i.e. without the need of rotation, and is much less prone to breakdown or high leakage currents, even in high-voltage and/or high-power applications. The portions ( A, B) may be easily separated by a groove ( ). The means ( ) may be a conductive channel created in a simple manner by means of a current pulse through the rectifying junction. Manufacture of the device is both simple and inexpensive.

Semiconductor device with a diode, and method of manufacturing such a device

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Einte Holwerda