Abstract: A direct voltage source (1) delivers a voltage (U.sub.B) at its output terminals, which is then converted by a direct voltage/direct voltage converter (2) to a higher value. This higher voltage value (U.sub.D) constitutes the input voltage for a controlled full bridge circuit (3), which generates a controlled alternating current (I.sub.L) or an alternating voltage (U.sub.L) from the supplied input voltage. This alternating voltage is present at the output terminals (4, 5) and constitutes the supply voltage for a high-pressure gas discharge lamp. A control circuit (7), which supplies its control pulses via a line (8) is provided to control the full bridge circuit. In addition, an ignition circuit (9) is provided, which supplies the ignition voltage via the line (10) to the high-pressure gas discharge lamp (6). In accordance with the invention, the full bridge circuit (3) is controlled by the control circuit (7) in such a way that the duration of the half-wave phases of the lamp voltage (U.sub.

Abstract: A permanent magnet alternator includes a stator core having outwardly projecting teeth and further includes a plurality of permanent magnets surrounding the stator core. The stator core is formed from a continuous, helically wound metallic strip having a plurality of teeth defined between slots formed in one edge thereof. The stator core is formed by winding the strip edgewise around a cylindrical mandrel. To facilitate winding and avoid distortion, arcuate regions, conforming to the curve of the mandrel, are formed in the strip opposite the teeth.

Abstract: A method for controlling the power supplied by a sinusoidal source (1) wherein the power supplied is determined, on the one hand, by the integer number of the pulses comprised in a burst which is fully switched through to the load (17) at the output of the circuit and, on the other hand, by the length of the last phase angle-controlled pulse within each burst. To provide the actuation signal for a switch which connects the sinusoidal pulses to the load, the zero passages of the sinusoidal pulses (A) of the sinusoidal source (1) are determined in a zero passage detector (5). A division circuit (7) generates trigger pulses (C) of a lower frequency from the zero passage pulses (B), which trigger pulses reset the ramp voltage (D) of a sawtooth generator (9). The ramp voltage (D) is compared in a comparator (15) to a regulated quantity (E) of a desired value device (11).

Abstract: A circuit and a method for actuating a brushless DC motor are proposed. The circuit comprises a delta-connected oscillator (1) for generating a triangular voltage as a function of commutation pulses resulting from the position of the rotor of the DC motor, a sampling and hold circuit (2) for sampling and holding a holding voltage (Ul) from the curve of the triangular voltage as a function of time at the moment of the commutation, and a differential amplifier (4) for amplifying the differential voltage between the triangular voltage and the holding voltage (Ul), with the output signal of the differential amplifier being supplied to the final stage of the actuation control circuit. An additional adder (3) for adding a voltage (U block) to the holding voltage (Ul) sampled from the triangular voltage and held can be used, with the differential voltage between the triangular voltage and the sum of holding voltage (Ul) and block voltage (U block) being amplified in the differential amplifier (4).

Abstract: A circuit arrangement for affecting signals which contains a first and a second circuit element or section (10, 11). A switch-on delay unit (35) is disposed in the second circuit sections (11) which, after start-up of the two circuit elements (10, 11), maintains the first circuit section (10) in a switched-off state for a predetermined time (T). During the predetermined time (T) an idle level occurs at an output (40) of a signal processing unit (41) which is provided for detecting a measured value occurring in the first circuit section (10), for example. The idle level is stored in a memory (38). At the end of the predetermined time (T), the idle level stored in the memory (38) is used for the correction of the signal. A fresh correction value is available after each new start-up of the two circuit sections or elements (10, 11), so that long-time changes are taken into consideration.

Abstract: A network interface is designed for two-wire reception via a serial bus and has a differential receiver which is connected to input lines. The network interface likewise has an element for recognizing error states on the bus lines. It is designed such that it changes into single-wire operation after recognizing the error state, in order to maintain the data traffic. In this case, one input line is connected to a fixed terminal potential. The terminal potential is in this case selected such that the magnitude of the potential difference between the two input lines is the same for both bit levels.

Abstract: An engine-driven generator includes an internal combustion engine, a permanent magnet alternator and an AC to AC converter. The output frequency and voltage of the permanent magnet alternator are largely dependent on engine speed and the alternator load. The AC to AC converter converts the speed-dependent alternating potential developed by the alternator to another alternating potential whose frequency and voltage are largely independent of engine speed. Voltage regulation is provided by varying the engine speed in accordance with the load current. Frequency regulation is provided by frequency dividing the alternator output by an integer divisor that varies in accordance with engine speed. Additional voltage regulation is provided by deleting selected cycles of the alternator output current as needed to maintain the RMS output voltage within predetermined limits.

Abstract: An internal combustion engine for portable power generating equipment includes a camshaft assembly having an integral oil pump at one end thereof. The camshaft, which is preferably formed of two dissimilar materials, is mounted for axial movement in response to increased oil pressure so as to provide automatic oil pressure regulation. Structure is provided for reducing engine compression at low speeds to reduce cranking resistance during starting. Speed control is provided by a stepper motor coupled through a cam to the engine throttle. The cam is shaped so as to counteract the non-linear relationship between throttle position and engine power and speed so as to provide a desired relationship between the position of the stepper motor and the engine power and speed.

Abstract: A permanent magnet alternator includes a stator core having outwardly projecting teeth and further includes a plurality of permanent magnets surrounding the stator core. The stator core is formed from a continuous, helically wound metallic strip having a plurality of teeth defined between slots formed in one edge thereof. The stator core is formed by winding the strip edgewise around a cylindrical mandrel. To facilitate winding and avoid distortion, arcuate regions, conforming to the curve of the mandrel, are formed in the strip opposite the teeth.

Abstract: An engine-driven generator includes an internal combustion engine, a permanent magnet alternator and an AC to AC converter. The output frequency and voltage of the permanent magnet alternator are largely dependent on engine speed and the alternator load. The AC to AC converter converts the speed-dependent alternating current developed by the alternator to another alternating current whose frequency and voltage are largely independent of engine speed. Voltage regulation is provided by varying the engine speed in accordance with the load current. Frequency regulation is provided by frequency dividing the alternator output by an integer divisor that varies in accordance with engine speed. Additional voltage regulation is provided by deleting selected cycles of the alternator output current as needed to maintain the RMS output voltage within predetermined limits.

Abstract: An internal combustion engine for portable power generating equipment includes a camshaft assembly having an integral gerotor oil pump at one end thereof. The camshaft, which is preferably formed of two dissimilar materials, is mounted for axial movement in response to increased oil pressure so as to provide automatic oil pressure regulation. Structure is provided for reducing engine compression at low speeds to reduce cranking resistance during starting. Speed control is provided by a stepper motor coupled through a cam to the engine throttle. The cam is shaped so as to counteract the non-linear relationship between throttle position and engine power and speed so as to provide a desired relationship between the position of the stepper motor and the engine power and speed.

Abstract: A sludge volume of difficult to dewater sludge is subdivided in a sludge dewatering press into fractional volumes which are self-draining even at press pressures of 50 bar and more. The partitions are water-permeable and form water channels for conducting the expressed liquid away from the sludge volume.