Abstract:
Gleichrichter-Vorrichtung (20) zum Gleichrichten eines m-phasigen Wechselsignals, die m Gleichrichterschaltungen (40. m) umfasst, mit m als ganze Zahl ≥ 1. Die m Gleichrichterschaltungen (40. m) sind parallel zueinander angeordnet und sie umfassen eine Serienschaltung eines positiven Schaltungsbereichs (14) und eines negativen Schaltungsbereichs (15). Knoten (a1, a2, a3) dienen zum Einspeisen einer Phase des m-phasigen Wechselsignals an einem Verbindungsleiter (16, 17, 18), der sich zwischen dem positiven Schaltungsbereich (14) und dem negativen Schaltungsbereich (15) befindet. Mindestens eine der m Gleichrichterschaltungen (40. m) umfasst: - mindestens einen Feld-Effekt-Transistor (Q1, Q2, Q3), der im negativen Schaltungsbereich (15) angeordnet und dessen Drain (d) mit dem Knoten (a1, a2, a3) und dessen Source (s) mit einem unteren Potentialpunkt (k5) verbunden ist, - einen autosynchronen Treiber (aASD), der analog aufgebaut ist und der mit dem Gate (g) des mindestens einen Feld-Effekt-Transistors (Q1, Q2, Q3) verbunden ist, wobei der autosynchrone Treiber (aASD) dazu ausgelegt ist die entsprechende Phase des m-phasigen Wechselsignals zu überwachen und selbstständig einen Schaltvorgang des mindestens einen Feld-Effekt-Transistors (Q1, Q2, Q3) auszulösen, - mindestens eine Diode (DS 1 , DS 2 , DS 3 ) die im positiven Schaltungsbereich (14) zwischen dem Knoten (a1, a2, a3) und einem oberen Potentialpunkt (k4) angeordnet ist, so, dass die Gleichrichter-Vorrichtung (20) ein Gleichsignal (+V D ) bereit stellt, das zwischen dem oberen Potentialpunkt (k4) und dem unteren Potentialpunkt (k5) abgreifbar/entnehmbar ist.
Abstract:
A converter for converting an incoming alternating current (AC) electrical signal to an outgoing direct current (DC) electrical signal, comprising: a signal chopping module adapted to receive and chop the incoming AC electrical signal to generate a plurality of high voltage pulses having a substantially same amplitude at a given frequency; a transformer coupled to the signal chopping module and having multiple primary and secondary windings configured to reduce the voltage of the plurality of high voltage pulses and output a plurality of low voltage pulses; and a rectifying module coupled to the transformer and adapted to receive the low voltage pulses and generate therefrom the outgoing DC electrical signal.
Abstract:
L'alimentation à découpage (10) comporte : - une entrée (16) pour un courant alternatif d'entrée (lPRι) sous une tension d'entrée (VPR|); - une sortie (36) pour un courant continu de sortie (Uc) et, - successivement, depuis l'entrée vers la sortie, un système d'interrupteurs commandés (20); - un transformateur (21 ) dont le primaire (24) est relié en sortie du système d'interrupteurs commandés (20); - un circuit de redressement (28) connecté aux bornes d'un circuit secondaire (26) du transformateur; et - un condensateur de stockage (32) relié en parallèle aux bornes de sortie du circuit redresseur (28) avec interposition d'une bobine (34), la sortie (36) étant formée aux bornes du condensateur de stockage (32), Le système d'interrupteurs commandés (20) est le seul circuit entre l'entrée (16) et la sortie (36) à comporter des organes de commutation et il comporte des moyens (22) de commande du système d'interrupteurs (20) pour commander l'amplitude du courant d'entrée (lPRι) en fonction de la tension d'entrée (VPR|) du courant de sortie (Uc) et de la tension (Vsec) aux bornes du condensateur de stockage (32).
Abstract:
A power conversion unit (100) and method for efficient conversion of power for one or more variable loads (132, 134) are disclosed herein. Power having a first férin is supplied to one or more power conversion units (PCUs) (122, 124, 126) connected to the one or more variable loads. The PCUs are adapted to convert the power form the first forir, to other forms suitable for use by die components of the destination system (120). Based at least in part on a predicted load requirement of the variable load, the operation of the PCUs can be controlled to provide sufficient power to the one or more loads at the appropriate time while minimizing wasted power generation by deactivating any unnecessary PCUs during a decrease in power consumption or by activating PCUs during an increase in power consumption. Additionally, based at least in part on a predicted temporary change in the load requirements, the PCU can change its output voltage in anticipation of the temporary change in the load requirement, such as by increasing the output voltage to provide additional energy to the one or more variable loads during a temperoray increase in power consumption or by decreasing the output voltage during a temporary decrease in power consurription. The present invention proves particulary beneficial when employed to distribute power within a radar system.
Abstract:
It is presented a voltage source converter comprising a first converter device. The first converter device comprises: a plurality of director valves, wherein each director valve comprises two anti-parallel thyristors provided in a bridge for switching between two states, the bridge being provided in at least one phase leg connected to two a first pair of direct current poles and comprising a midpoint connected to an alternating current, AC, terminal; and at least one commutation cell connected to a respective one of the at least one phase leg, wherein the commutation cell is controllable to reverse-bias a thyristor of at least one director valve of a connected phase leg when the thyristor is to stop conducting current. By providing anti-parallel thyristors in the director valves, greater control is possible. For instance the current between the DC poles can be turned off using the director valves.
Abstract:
Circuits (1) for receiving output signals from transformers (2) comprise filters (11) and switches (12). In the case of magnetic / electronic transformers, the filters (11) are activated / deactivated, for example for filtering / not filtering unwanted signals coming from converters (4). The filters (11) may comprise capacitors. The switches (12) may comprise fuses. Output signals of magnetic / electronic transformers comprise relatively low / high frequency signals that result in relatively small / large currents flowing through the capacitors, which currents will not blow / blow the fuses. The capacitors, when activated, form, together with leakage inductances of the magnetic transformers, electromagnetic interference filters. Alternatively, the circuits (1) may further comprise detectors (13) for detecting transformer types and for controlling the switches (12) in response to detection results. Then, possibly, the detectors (13) are arranged to detect frequency signals in the output signals and comprise comparators (15) for comparing detection results (14) with threshold values.
Abstract:
A bidirectional AC-DC converter is presented with reduced passive component size and common mode electro-magnetic interference. The converter includes an improved input stage formed by two coupled differential inductors, two coupled common and differential inductors, one differential capacitor and two common mode capacitors. With this input structure, the volume, weight and cost of the input stage can be reduced greatly. Additionally, the input current ripple and common mode electro-magnetic interference can be greatly attenuated, so lower switching frequency can be adopted to achieve higher efficiency.