摘要:
A driver for a circuit with a capacitive load, is disclosed, including a power converter to receive an input voltage and generate a clean folded waveform as an output. An unfolding stage referenced to the input voltage is configured to receive the clean folded waveform from the power converter and unfold the folded waveform into a full waveform. The driver includes a controller to control the driver. The converter may operate bi-directionally.
摘要:
Electrical power systems and methods using bidirectional power converters to provide, among other functions, uninterruptible power supplies for loads such as cell towers. The power-packet-switching power converter can be connected, for example, to a photovoltaic array, batteries, and a critical load such as a cell tower. An AC generator can also be connected in order to power the cell tower and/or to charge the batteries as needed. Green energy utilization is maximized, power conversion efficiency is increased, and system costs are decreased, by having only a single power conversion stage for all conversions.
摘要:
Constant current regulator (10) for supplying a series circuit (9) of a lighting installation with an output electrical power corresponding to a predetermined output power, comprising a plurality of modules (13) electrically connectable for simultaneous operation to jointly provide the output power, the modules being each configured for providing a module output power contributing to the output power of the regulator. Each module comprises its proper transformer (135) for providing galvanic insulation as required by local standards, and a microcontroller (231) for controlling operation of the module. The constant current regulator comprises a data communication network (17) configured to be connected to the microcontrollers (231) of the modules (13), wherein the microcontrollers (231) are operable to exchange data over the data communication network (17) so as to make the constant current regulator (10) modular, meaning that one or more of such modules (13) can be added to or removed from the constant current regulator.
摘要:
An uninterruptible power supply system (UPS) includes an interconnect circuit configured to receive three-phase AC input power from an AC power source and a plurality of UPS subsystems each coupled to the interconnect circuit. A first UPS subsystem includes first and second single-phase AC-to-DC converters. At least one second UPS subsystem includes third and fourth single-phase AC-to-DC converters. In a first mode of operation, the interconnect circuit is configured to conduct at least one phase of the AC input power to the first UPS subsystem and at least one phase of the AC input power to the second UPS subsystem, and, in a second mode of operation, to disconnect the AC input power from the first UPS subsystem and to conduct at least one phase of the AC input power to the second UPS subsystem.
摘要:
Die Erfindung bezieht sich auf ein Verfahren zum Regeln eines Spannungszwischenkreiskonverters (K). Um einen solchen Spannungszwischenkreiskonverter (K) besonders sicher betreiben zu können, wird aus einem Sollwert (w ud ) der Gleichspannung (u d ) und dem Istwert (w ud ) der Gleichspannung (u d ) am Gleichspannungseingang (EIN1/2) des Spannungszwischenkreiskonverters (K) eine spannungsbezogene Regeldifferenzgröße (e' ud ) gebildet, die einer Spannungsregelstufe (RU) mit Begrenzer-Eigenschaft hinsichtlich eines zugelassenen maximalen und minimalen Wertes (idmax, idmin) des Gleichstromes am Gleichspannungseingang (EIN1/2) des Spannungszwischenkreiskonverters (K) zugeführt wird. Eine strombezogene Ausgangsgröße (w' id) der Spannungsregelstufe (RU) wird mit dem Istwert (x id ) des Gleichstromes am Gleichspannungseingang (EIN1/2) des Spannungszwischenkreiskonver- ters (K) unter Bildung einer strombezogenen Regeldifferenzgröße (e'' id ) für eine Stromregelstufe (RI) mit Begrenzer-Eigenschaft hinsichtlich eines zugelassenen maximalen und minimalen Wertes (udmax, udmin) der Gleichspannung (u d ) am Gleichspannungseingang (EIN1/2) des Spannungszwischenkreiskonverters (K) verglichen und eine spannungsbezogene Ausgangsgröße (w'' ud ) der Stromregelstufe (RI) als Stellspannung für den Spannungszwischenkreiskonverter (K) verwendet. Die Erfindung betrifft ferner eine Anordnung zum Regeln eines Spannungszwischenkreiskonverters (K).
摘要:
The present invention concerns a power backup processor unit (200) comprising a first AC input line (313) provided to be connected to an AC power supply; first and second AC output lines (315, 316) provided to be connected to a critical load (204), wherein the first AC output line (315); and a neutral line (314) provided to be connected to a neutral port. The power backup processor unit (200) also comprises first and second DC voltage busses (311 ,312) provided to be connected to a DC power supply (206); and a capacitor (207) as well as first, second and third half-bridge circuits (301) ,302,303) interposed between the first and second DC voltage busses (311 ,312). To said first and second DC voltage busses (311 ,312) the first half-bridge circuit (301) links the first AC input line (313), the second half- bridge circuit (302) the first AC output line (315) and the third half-bridge circuit (303) the neutral line (314). A series of controllers (208) is provided to command the first and second half-bridge circuits (301 ,302) using pulse width modulation to convert an input AC voltage into two different, substantially continuous voltages at the first and the second DC voltage busses (311 ,312) and these into an output AC voltage at the first AC output line (315). The controllers (208) are also provided to command the third half-bridge circuit (303) so as to generate an output voltage at the second AC output line (316) that runs countercyclically to that of the first AC output line (315), thus achieving an increased voltage between the two AC output lines (315,316). The invention also concerns a method of controlling said power backup processor unit (200).
摘要:
The present invention discloses a power variable-type motor driving circuit (10) and driving method which can stably drive a motor (13) by removing a rectifier capacitor causing an inrush current and correcting a PWM signal by a voltage having ripples. The power variable- type motor driving circuit (10) includes an alternating current power supply unit (R, S, T), a diode rectifier circuit (11) for rectifying power of the alternating current power supply unit (R, S, T), a PWM generating unit for generating a predetermined PWM signal according to the rectified voltage, a control unit (14) for reading the rectified voltage, and correcting the PWM signal from the PWM generating unit according to the rectified voltage, and an inverter unit (12) for outputting the rectified voltage according to the corrected PWM signal.
摘要:
The present invention relates to a multifunction power convertor. The multifunction power convertor of the invention is consisted of a rectification circuit, a filter circuit connecting with the rectification circuit, a inverter circuit connecting with the filter circuit, a differential mode voltage suppression reactors (LS1 , LS2, LS3) and a filter capacitor group which series connect to the output lines (U, V, W) of the inverter circuit respectively. The character of the present invention lies in that a closed toroidal magnetic core is provided on the output lines (U, V, W) between the differential mode voltage suppression reactor and the filter capacitor group, and the output lines (U, V, W) parallel wind on the closed toroidal magnetic core. The advantages of this invention is that, the high frequency signal is insulated by the closed toroidal magnetic core, and the output of the common mode voltage is depressed, so the waveform of outputting voltage is improved, at the same time, the structure of which is very sample, the cost is reduced greatly, the volume and weight of which is also reduced greatly.