摘要:
A method is disclosed to selectively provide information to one or more remote computing devices. The method provides an information storage and retrieval system comprising first information, a first logical partition, and a second logical partition, where the first information is disposed in the first logical partition. The method further provides a data extraction algorithm, forms second information comprising an instantaneous point-in-time copy of the first information, and forms third information from the second information using the data extraction algorithm. The method then migrates the third information from the first logical partition to the second logical partition, and provides access rights to that third information to one or more computing devices capable of communicating with the information storage and retrieval system.
摘要:
A method is provided for exercising an engine-driven, electrical generator. The generator has a first operation mode wherein the generator generates a predetermined output voltage at a predetermined frequency with the engine running a predetermined operating speed and a second exercise mode. The method includes the step of running the engine at a predetermined exercise speed with the generator in the exercise mode. The predetermined exercise speed is in the range of 40% to 70% of the predetermined operating speed of the engine. In addition, in the exercise mode, the generator generates an exercise voltage that is less than the predetermined output voltage.
摘要:
A circuit for detecting an impermissibly high current in an output stage contains two transistors arranged in a bridge branch of a bridge circuit. A comparator compares the voltage obtained at the connection point of the two transistors with the voltage obtained at the center tap of a voltage divider connected to the power supply terminals. A switching transistor changes the voltage divider ratio of the voltage divider as a function of the switching signal of one of the transistors.
摘要:
A polarity reversal protective circuit for an electronic power output stage that can be driven via a drive circuit is described. In the case of an incorrect polarization of a supply voltage, power FETs are used in at least one supply terminal to interrupt a connection of the wrongly applied supply voltage to the drive circuit and the power output stage. A definite polarity reversal protection is obtained using a circuit that is improved with respect to cost and space requirement. A single N-channel power FET is looped, with its source-drain path, into the positive supply terminal of the supply voltage. The source terminal of the N-channel power FET is connected with the positive supply terminal. The gate terminal of the N-channel power FET is connected to a collector of a PNP transistor, which is additionally connected to an output of the drive circuit via a current-limiting resistor. An emitter of the PNP transistor is connected—via a diode that is conductive when the supply voltage is wrongly applied—to the positive supply terminal. The base of the PNP transistor is connected—via a base resistor—to a negative (ground) supply terminal of the supply voltage.
摘要:
Proposed is a gaseous-discharge lamp, in particular for motor-vehicle headlamps, comprising a burner vessel of glass or the like having at least two electrodes, the burner vessel being provided with a lamp base that includes the electrical terminals and that is insertable into a lamp base socket. Arranged in the lamp base is an electronic ballast unit that supplies the lamp with the necessary ignition and maintaining voltage. By accomodating the balast unit in the lamp base, one can achieve a small-volume gaseous-discharge lamp having short high-voltage leads i an integrated type of construction, making it possible to keep the ignition voltage to a minimum.
摘要:
A device for operating a gas discharge lamp (13) is proposed, having a power supply circuit which makes available an alternating voltage (UL) or an alternating current (IL) of a predetermined period duration (TP) for the supply of the gas discharge lamp (13) with predetermined electrical power. During an intended reduction of the mean lamp rating compared to the operation at normal rating, an increase of the instantaneous power is provided within a half period duration (TP/2) prior to the pole change of the alternating voltage (UL) or alternating current (IL). Preferably, the duration of the increase of the instantaneous power is a function of the period duration (TP). The device according to the invention for operating the gas discharge lamp (13) largely prevents the arc comprised in the gas discharge lamp (13) from going out during the pole-changing process and therefore ensures reignition following the pole-changing process. A preferred application of the device according to the invention is a gas discharge lamp (13) which is installed in a motor vehicle.
摘要:
A power-supply circuit having a switching regulator (10) and at least one additional circuit (14, 14') whose two respective outputs (11, 17) are guided together to a common or joint output (18) by diodes (D3, D3'; D4). The additional circuit (14, 14') produces, from an alternating quantity (15) occurring inside the switching regulator (10), a second output voltage (U+, U'+) that is in a second output-voltage range and is more positive with respect to the first output voltage (U-) that is made available at the first output (11) of the switching regulator (10) and is in a first output-voltage range. A gas-discharge lamp, for example, is provided as the load (L) between the first and second outputs. The division of the voltage ranges to be made available for the load (L) into at least two partial ranges permits a high effectiveness of the current-supply circuit of the invention.
摘要:
A circuit arrangement for multiple use of a transformer core, comprising a winding with center tap on the primary side and two separate windings on the secondary side, has a controlled switch in each feed line for the two primary windings which is preferably clocked with high frequency. A rectifier is connected to the first secondary winding in particular for forming a switching power supply, which is thus supplied with energy. An FET transistor is coupled to the second secondary winding, in particular for forming a driving pulse transmission, preferably via two Z-diodes with anti-serial connection, which transistor is thus supplied with driving pulses. The magnetic circuit for the transformer is actuated via switches which change polarities on the primary side of the transformer. The switch-on pulse duty factor for the switches is selected to be higher than 50%.
摘要:
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. A stepper motor coupled to the throttle of the internal combustion engine controls the speed of the engine in accordance with commands received from an electronic system control.
摘要:
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.