Melexis Tessenderlo NV Patent applications |
Patent application number | Title | Published |
20120001620 | MAGNETIC ANGLE SENSOR - A magnetic angle sensor comprises a semiconductor chip, at least two magnetic field concentrators of planar shape which are arranged on a surface of the semiconductor chip, and four Hall sensors. Each Hall sensor is assigned to one of the magnetic field concentrators and comprises a Hall element or a cluster of Hall elements. The Hall elements are integrated in the semiconductor chip and are arranged in the region of the edge of the assigned magnetic field concentrator where they are permeated by field lines of the magnetic field which extend approximately perpendicularly to the mentioned surface of the semiconductor chip in the region of the edge of the magnetic field concentrator. Two Hall sensors form a first pair of sensors for measuring a first component of the magnetic field and the two other Hall sensors form a second pair of sensors for measuring a second component of the magnetic field. Connecting lines which connect the Hall sensors which are arranged in the region of the edge of the same magnetic field concentrator run either parallel with respect to each other or form a single common line. | 01-05-2012 |
20110074327 | CONTROL OF SINUSOIDALLY DRIVEN BRUSHLESS DC (BLDC) MOTORS - In response to the determination or estimation of a back EMF zero crossing event for the phase, a time T | 03-31-2011 |
20100213968 | TESTING INTEGRATED CIRCUITS - A test insert for an integrated circuit according to the present invention comprises access contacts and an electrical path. Furthermore, there may be additional access contacts and a plurality of different electrical paths. The electrical path is comprised of a plurality of tracks, each track provided at a single layer of the integrated circuit and connected to the other tracks by interconnecting vias. The vias provide interlayer contacts and thus allow the tracks to be connected into a single electrical track. In one embodiment, an access contact is connected to ground; another contact is connected to a reference voltage; and connected to various points in the electrical path are transistor-resistor pairs. The transistor-resistor pairs are in connected between earth and a third access contact. If the electrical path is intact at the track connected to a transistor-resistor pair, a current can flow between contact and the respective earth of the transistor-resistor pair. By analysing the current drawn from contact it can be deduced whether the path is operational as a whole and if not, how far along the path a fault lies. This can therefore isolate a particular interconnection between layers or a particular layer as being faulty. | 08-26-2010 |
20100141192 | OPERATION OF BLDC MOTORS - The present invention there is provides a method of determining the rotor position in an electric motor comprising the steps of: superimposing one or more alternating signals on to the driving waveform so as to generate one or more oscillating currents in the stator coils; monitoring the variation in magnitude of the oscillating currents and thereby determining the rotor position. Typically, two alternating signals are applied in opposition so as to have no net effect on the torque applied by the driving waveform. Using this technique rotor position estimation can be obtained at start-up from stand-still and at low to medium speeds. The method can be used in applications where a fast motor start is needed under unknown load conditions and can be used to detect when the rotor has passed a certain position that coincides with the commutation instance. | 06-10-2010 |