Abstract:
A detector circuit for actuating at least one fluorescent lamp may be configured such that the actuation of at least one fluorescent lamp occurs as a function of a first signal at a first input and as a function of a second signal at a second input if the first signal and the second signal are each greater than a first prescribed voltage and less than a second prescribed voltage during a start-up phase.
Abstract:
A detector circuit for actuating at least one fluorescent lamp may be configured such that the actuation of at least one fluorescent lamp occurs as a function of a first signal at a first input and as a function of a second signal at a second input if the first signal and the second signal are each greater than a first prescribed voltage and less than a second prescribed voltage during a start-up phase.
Abstract:
A detector circuit for controlling at least one fluorescent lamp is provided, wherein the detector circuit is configured such that an inactive fluorescent lamp can be detected if a first signal is present at least one of a first input and a second signal is present at a second input in a detection interval after a start-up phase.
Abstract:
A detector circuit for controlling at least one fluorescent lamp is provided, wherein the detector circuit is configured such that an inactive fluorescent lamp can be detected if a first signal is present at least one of a first input and a second signal is present at a second input in a detection interval after a start-up phase.
Abstract:
In electronic ballast having inverter rectifiers for fluorescent lamps, a regulation of the lamp current or of the lamp power is usually used in order to stabilize the lighting current independently of tolerances of the electrical properties of the fluorescent lamp or their aging phenomena. When such a regulation is simultaneously utilized for dimming the fluorescent lamp, difficulties arise at the lower limit of the dimming range at, for example, 1% of the nominal light power. The range of brightness at the lower limit is regulated on the basis of an additional regulation, dependent on the discharge resistance of the fluorescent lamp. An auxiliary measured quantity resulting therefrom is superimposed on the actuating quantity of the regulator that results from a reference/actual value comparison of the current or power regulation for the purpose of stabilizing the lamp current.
Abstract:
The invention is an electrodynamic linear oscillating motor, which has high power densities in the magnet gap, a high efficiency, and magnetically restores the oscillating system to a center position. The linear oscillating motor has a stator system, which has at least one magnet, and an oscillating system, which is movably mounted in the magnetic field of the stator. The oscillating system has at least one core made of a soft magnetic material, and at least one driving coil. The electrodynamic linear motor combines the advantages of the known moving coil and moving magnet linear motor, achieving electrodynamic conversion levels of up to 99%. The motor is suited as a drive for refrigerating and air conditioning systems having low power and also for pumping and injection systems, and, reversing the electrodynamic principle, as a generator, such as for shock absorber systems in a motor vehicle.
Abstract:
The invention relates to a ballast for operating at least one low-pressure discharge lamp, preferably a three- or four-lamp ballast. In order for all parallel- or series-connected low-pressure discharge lamps (L40-L43) to shine equally bright even in the case of strong dimming, the ballast according to the invention has a transformer (Tr40) for balancing the currents in the lamp branch circuits and a transformer (Tr41) for compensating the losses owing to parasitic capacitances.
Abstract:
The invention relates to a circuit arrangement for operating at least one discharge lamp, the circuit arrangement having a half-bridge inverter (Q10, Q11) with a downstream load circuit (L1, C10, LP1, C11), at least one coupling capacitor (C11) which is connected to the load circuit (L1, C10, LP1, C11) and to the half-bridge inverter (Q10, Q11), and a drive device (A1) of the half-bridge inverter (Q10, Q11). According to the invention, the circuit arrangement has a reference voltage source (R13, R14) and a detector circuit (DE1) which detector circuit compares the voltage drop across the at least one coupling capacitor (C11) or the voltage drop, divided downwards by a voltage divider, across the at least one coupling capacitor (C11) with the reference voltage of the reference voltage source (R13, R14), and generates an output signal for driving the half-bridge inverter (Q10, Q11).
Abstract:
The invention relates to an electrodynamic linear oscillating motor characterised by high power densities in the magnet gap, magnetic return of the oscillating system to the centre position and a comparatively low weight of the oscillating system. The linear oscillating motor comprises a stator system, which is provided with at least one magnet (4) and an oscillating system which is supported such that it is able to move in the magnetic field of the stator. The oscillating system comprises at least one core (1) made of a magnetically soft material, e.g. a ferrite, and at least one driving coil (2, 3). The oscillating system is designed such that, if at least one driving coil (2,3) is de-energised, it is returned to the centre position by way of a reluctance force acting on the oscillating system. The electrodynamic linear motor in accordance with the present invention essentially combines the advantages of the known MC and MM linear motors, enabling electrodynamic conversion rates of up to 99% to be achieved. The linear oscillating motor is particularly suited as a drive for refrigeration and air-conditioning systems with low power ratings, as well as for pump, injection and shock absorber systems in automobile engineering.
Abstract:
Circuit arrangement for operation of discharge lamp comprising an input for connecting a supply alternating current voltage. A startup supply device is provided with an input and an output, where the input is connected to an input of a control circuit and the output is connected to another input of the control circuit. The startup supply device provides a startup supply voltage at the output of the startup supply device and hence reduces the stand-by losses.