Abstract: A circuit arrangement with a power input and at least one power supply unit that generates a DC voltage for operating an electronic device including a power input circuit inserted between the power input and the at least one power supply unit that selectively disconnects or rectifies an AC voltage provided via the power input for the at least one power supply unit, wherein the power input circuit has at least one first semiconductor switching element that switches a first electrical load path with a current limiting element from the power input to the at least one power supply unit, and at least one second semiconductor switching element that switches a second electrical load path from the power input to the at least one power supply unit, and a power input filter, wherein the power input filter includes a first filter circuit arranged between the power input and the power input circuit and a second filter circuit arranged between the power input circuit and the at least one power supply unit.

Abstract: The invention relates to an arrangement for providing active fire protection in aircraft by means of at least one protective shield. According to the invention, the at least one protective shield is formed with an intumescent material, which in the event of a fire can be activated, in particular made to expand, in a controlled manner well below the initial temperature otherwise usual for intumescent materials of the order of 250° C. by means of an electrical heating device. The current temperature in the hold (preferably at various temperature measuring points) of the aircraft is measured by means of at least one temperature sensor and transmitted to a controlling and regulating device. In the event of a fire, the heating devices are activated and the intumescent reactions of the protective shields for providing fire protection are initiated within a temperature interval between 90° C. and 150° C.

Abstract: A network filter includes at least one X capacitor located between two supply lines and at least one discharge resistor that discharges the X capacitor, wherein the discharge resistor is arranged in series with at least one switching element, and at least one detector circuit that recognizes a network disconnection and closes the switching element to discharge the X capacitor via the discharge resistor when a network disconnection is recognized.

Abstract: Provided is a fire protection device for an aircraft or spacecraft. The fire protection device is provided with a fireproof bulkhead and an adjusting device, by means of which the fireproof bulkhead can be adjusted from a ventilating position I into a screening position II. This may prevent a stream of smoke and heat from penetrating into the cabin when there is a fire underneath the fuselage.

Abstract: A computer system has at least one supply device, at least one system component with a data-processing device and at least one communications device. The supply device has at least one programmable control module that is supplied with an operating energy by a voltage source coupled to the at least one supply device and operated independently thereof.

Abstract: The invention relates to a method for the production of sandwich components with an open core structure 2 and a cover layer 1, 3 applied to each side, wherein the cover layers 1, 3 are formed with a curable plastic material, and the sandwich component is cured in a closed device under pressure. According to the invention, a charging gas, in particular nitrogen or air, is introduced to the core structure 2 prior to at least partial solidification of the cover layers 1, 3, wherein a charging gas pressure pCharging gas is selected that is less than or equal to an operating pressure pOperating of the closed device in order to, in particular, at least largely prevent the formation of sink marks in the cover layers (1, 3). Furthermore, the invention relates to a press for implementing the method.

Abstract: The invention relates to a pipeline 1, 34 for conducting air, in particular in a temperature range between ?55° C. and +85° C. and at a differential pressure load of at most ±500 hPa relative to cabin pressure, for air conditioning in aircrafts. According to the invention, the pipeline 1, 34 is formed with a foamed plastics material and/or with a dense plastics material, one outer face 9, 36 of the pipeline and/or one inner face 17 of the pipeline comprising a wrapping 6, 37 with at least one linear reinforcing element, in particular with resin-impregnated carbon fibers or glass fibers for reinforcement, at least in certain sections. Owing to the winding 6, 37 provided for reinforcement, at least in certain sections, on the outer face 9, 36 of the pipeline and/or the inner face 17 of the pipeline, the pipeline 1, 34 can be optimally adapted to different load requirements along the section for laying, resulting in a potentially considerable reduction in weight.

Abstract: The invention relates to a circuit unit for driving an electronically commutated fan motor with a power stage for driving windings of the fan motor and with a control stage for driving the power stage. The circuit unit is distinguished in that an operating voltage of the control stage is separated from an operating voltage of the power stage by a diode and in that an arrangement is provided for smoothing the operating voltage of the control stage.

Abstract: An ink cartridge has a housing with at least one ink container having an ink outlet extending to the outside and in which a differential pressure valve is mounted. The valve has a valve opening and a valve body which can move relative to it and which (relative to the ink chamber) sits sealed on the valve opening, loaded from the outside with a predetermined closing force, and can be moved to the outside from the valve opening against the closing force. In order to form a differential pressure valve which is stable over the long term, precise, easy to produce and install, the invention proposes that a first permanent magnet is attached to the valve body and relative to the valve opening a second permanent magnet is attached securely to the ink cartridge and is opposite the first permanent magnet with the same pole, so that the repelling force between the first and second permanent magnet acts as a closing force on the valve body.

Abstract: A press device for the energy-efficient curing of a sandwich component for an aircraft, comprising an open and mechanically adequately loadable core structure with cover layers applied to one side or to both sides, characterised in that the sandwich component is restrained between a pressure piston, an abutment and sidewalls of the press device, thus forming an essentially closed interior space, and at least one cover layer and/or the core structure comprise/comprises a curable duroplastic plastic material. A conveying device feeds heated air through the core structure of the sandwich component in a closed heated-air circuit or preferably in an open heated-air circuit in order to ensure energy-efficient curing of the sandwich component from the inside out. The heated air is temperature-controlled by a heater. In the case of an open heated-air circuit, heat recovery by a heat exchanger is provided.

Abstract: The invention provides an ultrasonic object inspection system for measuring the physical properties of a test object which includes a pulse generator for sending an electrical pulse signal to a transducer. The transducer then applies an ultrasonic signal to the test object and receives an ultrasonic echo signal from the test object which is then converted by the transducer to an electrical echo signal for sending to a signal processing circuit. The signal processing circuit includes a plurality of signal processing paths with each path scaling the electrical echo signal to a different degree and including a respective analog to digital converter for converting the electrical echo signal to a digital electrical echo signal. The signal processing circuit further includes a logic circuit for selecting the output of the respective analog to digital converter that provides the digital echo signal having the greatest amplitude without exceeding a predetermined saturation threshold.

Abstract: The apparatus and method of the present invention provides an ultrasonic object inspection system for measuring the physical properties of a test object comprising a pulse generator for generating and transmitting an electrical pulse signal to a transducer. The transducer receives and converts the electrical pulse signal to an ultrasonic signal, applies the ultrasonic signal to the test object, receives an ultrasonic echo signal from the test object, and converts the ultrasonic echo signal to an electrical echo signal, and transmits the electrical echo signal to a signal processing circuit. The signal processing circuit receives and processes the electrical echo signal and comprises a plurality of signal processing paths. Each of the signal processing paths scales the electrical echo signal to a different degree and comprises a respective analog to digital converter for converting the electrical echo signal to a digital electrical echo signal.

Abstract: The apparatus and method of the present invention provides a plurality of linear amplifiers simultaneously processing an ultrasonic signal. Each amplifier of the plurality of linear amplifiers has a predetermined gain level suitable for achieving the desired output signal level for input to an analog to digital (A/D) converter for processing. The output of each amplifier is sampled by each respective A/D converter at a very high frequency to convert the analog signal output of each of the linear amplifiers to a digital signal. Logic circuits simultaneously monitor all of the output digital signals from the A/D converters. The logic circuits determine which output of the A/D converters has the greatest linear output and stores the selected output in a memory storage device.

Abstract: A control unit for driving a regulating transistor (2) of a fan arrangement, in which the regulating transistor (2) is connected in series with an electronically commutated fan (1), having control means (5, 6, R1, R2) for the analog driving of the regulating transistor (2) with a control signal (Ucontrol) in a manner dependent on a control input voltage (Uin). The control unit comprises compensation means (R3, R4) for influencing the control signal (Ucontrol) in a manner dependent on an AC voltage component (UAC) of an operating voltage (UB) of the fan arrangement, so that the AC voltage component (UAC) of the operating voltage (UB) is completely or partially compensated for in a voltage across the fan (1).

Abstract: A heating system according to the invention comprises a heating layer that is integrated into a prepreg layer of a high-resistance prepreg material. The heating layer may comprise a bonded heating fabric, a metal oxide coating or electrically conductive threads. According to the invention, the heating system is integrated into a component to be heated. This component may consist, for example, of a floor panel for an aircraft.

Abstract: The apparatus and method of the present invention provides a plurality of linear amplifiers simultaneously processing an ultrasonic signal. Each amplifier of the plurality of linear amplifiers has a predetermined gain level suitable for achieving the desired output signal level for input to an analog to digital (A/D) converter for processing. The output of each amplifier is sampled by each respective A/D converter at a very high frequency to convert the analog signal output of each of the linear amplifiers to a digital signal. Logic circuits simultaneously monitor all of the output digital signals from the A/D converters. The logic circuits determine which output of the A/D converters has the greatest linear output and stores the selected output in a memory storage device.

Abstract: This invention relates to a process for cleaning an inkjet printing head which has nozzle openings and ink channels which lead to them, in which electrical drive elements for ejecting ink out of the nozzle openings are located, in which the nozzle openings and the ink channels are forcibly flushed with cleaning liquid. To achieve improved cleaning action more gently and less expensively, the drive elements are triggered in an oscillating manner during the forced flushing with cleaning liquid. A cleaning device for carrying out this process is also disclosed.

Abstract: An ink cartridge has a housing with at least one ink container having an ink outlet extending to the outside and in which a differential pressure valve is mounted. The valve has a valve opening and a valve body which can move relative to it and which (relative to the ink chamber) sits sealed on the valve opening, loaded from the outside with a predetermined closing force, and can be moved to the outside from the valve opening against the closing force. In order to form a differential pressure valve which is stable over the long term, precise, easy to produce and install, the invention proposes that a first permanent magnet is attached to the valve body and relative to the valve opening a second permanent magnet is attached securely to the ink cartridge and is opposite the first permanent magnet with the same pole, so that the repelling force between the first and second permanent magnet acts as a closing force on the valve body.

Abstract: A method for detecting commutation pulses of a fan motor with continuous measurement and storage of voltage values that are proportional to the fan current within predetermined time intervals. The measured voltage values are continuously evaluated by comparing two measured values that were obtained at different times. A result signal is outputted if the deviation between the compared measured values fulfills a predetermined constraint.

Abstract: A fan regulation circuit configuration includes an input receiving an input voltage (proportional to fan current and forms a first comparison voltage), a low-pass filter (filters input voltage and a filter output voltage is tapped off as second comparison voltage), a first comparison device for commutation identification (outputs signal indicating a commutation if value of one of the comparison voltages multiplied by first factor is greater than the other comparison voltage), and a regulator (outputs a control voltage dependent upon identified commutation pulses). The circuit has self-adjusting sensitivity adaptation and a second comparison device outputting a signal if the value of one of the comparison voltages multiplied by a second factor is greater than the other comparison voltage, the second factor being less than the first factor.