Abstract:
A method and apparatus for inductively measuring the bio-impedance of a user's body without complex circuitry. An apparatus is described for inductively measuring the bio-impedance of a user's body, wherein the apparatus includes a number of first inductors being adapted to induce an alternating magnetic field in the user's body and the apparatus further includes a number of second inductors being adapted to measure a secondary magnetic field in the user's body, wherein each of the number of first inductors overlaps at least one of the number of second inductors to form a number of measuring areas.
Abstract:
Organic light emitting diode arrangement Organic light emitting diode arrangements (1) are, to protect them against an effect of a switch-on, provided with circuits (31-36) for, during a first time interval that follows a switch-on, limiting a current through the organic light emitting diode arrangement (1) more and for, during a second time interval that follows the first time interval, limiting the current less. The circuit (31-36) may be passive such as a negative temperature coefficient resistor (31) or a series inductor (32) possibly with a freewheel diode (40) or may be active such as a switchable resistor (33) that is not bridged during the first time interval and that is bridged during the second time interval or a switchable resistor that is bridged in response to a detection of a value of the current exceeding a threshold value or such as a part of a converter (63) that is controlled in response to a detection of a value of the current.
Abstract:
A light emitting device includes an electronic driver and a planar light emitting element. The driver is connected with a source and the light emitting element, where the light emitting element has an internal capacitance and is connected to the driver in such a way that the internal capacitance serves as a passive output filter of the driver.
Abstract:
Conventional transformers with fractional turns have pre-manufactured cores usually with a complicated structure. According to the present invention, a method is provided of manufacturing a planar transformer where a ferrite polymer compound is laminated to a PCB for forming the core of the transformer. Advantageously, this may allow for the provision of a cheap and robust transformer.
Abstract:
Organic light emitting diode arrangement Organic light emitting diode arrangements (1) are, to protect them against an effect of a switch-on, provided with circuits (31-36) for, during a first time interval that follows a switch-on, limiting a current through the organic light emitting diode arrangement (1) more and for, during a second time interval that follows the first time interval, limiting the current less. The circuit (31-36) may be passive such as a negative temperature coefficient resistor (31) or a series inductor (32) possibly with a freewheel diode (40) or may be active such as a switchable resistor (33) that is not bridged during the first time interval and that is bridged during the second time interval or a switchable resistor that is bridged in response to a detection of a value of the current exceeding a threshold value or such as a part of a converter (63) that is controlled in response to a detection of a value of the current.
Abstract:
The present invention relates to a lighting system comprising a base part (12) with at least one primary coil (18), and at least one light module (13, 14) with a secondary coil (26) adapted to inductively interact with the primary coil (18). The lighting system is characterized in that said base part (12) comprises a substrate (50) carrying said primary coil (18), the winding of which lying in one plane and forming a flat coupling area (16); the winding of the second coil (26) lies in one plane; and said light module (13, 14) comprises at least one light element (20) and a flat bottom surface, so that the light module (13, 14) is placeable with its flat surface on the flat coupling area (16).
Abstract:
System and method of inductively measuring the bio-impedance of a conductive tissueThe present invention relates to a system (100) and method of inductively measuring the bio-impedance of a conductive tissue (106). Furthermore the invention relates to a computer program (115) for operating such a system (100). In order to provide a fast, simple and reliable adjustment technique for an inductively bio-impedance measuring system (100) with separate generator and sensor coils (101, 108; 117) a system (100) is suggested, the system (100) comprising a generator coil (101) adapted for generating a primary magnetic field, said primary magnetic field inducing an eddy current in the conductive tissue (106), a separate sensor coil (108; 117) adapted for sensing a secondary magnetic field, said secondary magnetic field being generated as a result of said eddy current, with the axis (109) of the sensor coil (108; 117) being orientated substantially perpendicular to the flux lines of the primary magnetic field (103), and a shimming coil (113; 120) adapted for generating a tertiary magnetic field in a way that in the sensor coil (108; 117) the primary magnetic field is cancelled out.
Abstract:
The present invention relates to a patient monitoring system, a patient monitoring method and a computer program. In order to improve the monitoring of patients, particularly for cardiac monitoring and weight monitoring, a patient monitoring system (1) is provided, the system comprising a number of force sensors (2) assigned to a patient's bed (3), the force sensors (2) being adapted for generating first signals corresponding to a first force component, the force sensors being further adapted for generating second signals corresponding to a second force component, the second force component not running parallel to the first force component, and the system further comprising an analyzing module (4) adapted for deriving from said signals data corresponding to the patient's condition.
Abstract:
The invention relates to an apparatus (1) for impedance measurement of an external substance, said apparatus comprising a plurality of resonant circuits with respective coil elements (3a, 3b, 3c, 3d) and respective capacitive elements (5a, 5b, 5c, 5d), said resonant circuits operating at different resonant frequencies. The signals (S1, S2, S3, S4) from the resonant circuits are detected by an ampere meter (6). The power loss experienced by the resonant circuits due to an electromagnetic interaction with a conductive body is reflected in a change in the magnitude of respective signals. By detecting the signal (S1, S2, S3 or S4), the power loss by the resonant circuit is determined. The resonant circuit is preferably integrated into an insulating fabric carrier (2). The invention further relates to a vital sign measurement system and a method of enabling an impedance measurement.
Abstract:
A wireless resonant powering device 1 according to the invention comprises a first inductor winding 3, which is arranged to form a transformer 9 with the inductor winding 13 of the energizable load 11. The first inductor winding 3 is arranged to form a resonant circuit 5, which may comprise a suitable plurality of electric capacitances and coils. The components of the resonant circuit 5 are selected such that the magnetic energy received by the inductor winding 13 damps the energy flow in the resonant circuit so that the induced voltage in the inductor winding 13 is substantially constant and is independent of the magnetic coupling between the first inductor winding 3 and the inductor winding 13 at the operating frequency of the driving means 6. The resonant circuit is driven by the driving means 6, comprising a control unit 6c arranged to induce an alternating voltage between a first semiconductor switch 6a and a second semiconductor switch 6b. At the output of the transformer 9 an alternating voltage is generated, which is rectified to a DC-voltage by a diode rectifier, filtered by an output capacitance. The resonant circuit 5 is operable on its coupling independent point by the driving means 6. This figure schematically illustrates a situation, where a variable coupling between the first inductor winding 3 and the inductor winding 13 exists. The invention further relates to a wireless inductive powering device, an energizable load, a wireless system and a method for wireless power transfer.