摘要:
L'invention concerne circuit de commande (26) de l'ouverture et de la fermeture d'un composant électronique de puissance (12). Le circuit comprend un pont en H comprenant : - une première branche verticale (33A) comprenant un premier générateur de courant (40) contrôlé numériquement et un premier interrupteur (34), le premier générateur (40) étant propre à délivrer un courant d'alimentation dirigé selon une direction ; et - une seconde branche verticale (33B) comprenant un deuxième générateur de courant (44) contrôlé numériquement et un deuxième interrupteur (36) connecté en série au deuxième générateur de courant (44), le deuxième générateur (44) étant propre à délivrer un courant d'alimentation dirigé selon une direction inverse. L'invention concerne également un dispositif de commande, un procédé de pilotage et un allumeur.
摘要:
The invention primarily discloses a switching apparatus, which allows two or more coupled coils to be dynamically switched in or out of a circuit using small control currents. The apparatus includes at least one latching circuit, one or more control circuits and a plurality of diodes. The latching circuit may have two bipolar transistors connected in a transistor latch configuration along with at least two diodes, such that at least one diode may be connected in series with a base of the each bipolar transistor. The control circuits may be connected to the latch circuit for operating the bipolar transistors. The plurality of diodes may be connected in the circuit for protecting the latching circuit and the control circuits from being exposed to high voltages and currents during the turn-off or turn-on of the inductor coils. This allows overall efficiency levels to be maintained while changing the inductance of the circuit as per requirements. The primary use of the disclosed circuit is in switch mode power supplies (SMPS).
摘要:
Die Erfindung beschreibt eine Ansteuerschaltung in leistungselektronischen Systemen mit einer Halbbrückenschaltung von zwei Leistungsschaltern, einem ersten sog. TOP-Schalter und einem zweiten sog. BOT- Schalter, die in einer Reihenschaltung angeordnet sind. Die Ansteuerschaltung weist einen TOP- Levelshifter zur Übertragung eines Eingangssignals von einer Ansteuerlogik zu einem TOP- Treiber auf. Hierbei ist der TOP- Levelshifter ausgebildet ist als eine Anordnung eines UP- und eines DOWN-Levelshifterzweiges sowie einer nachgeschalteten Signalauswerteschaltung. In dem zugeordneten Verfahren zur Übertragung dieses Eingangssignals übergibt die Signalauswerteschaltung ein Ausgangssignal an den TOP- Treiber, wenn entweder der UP- oder der DOWN-oder beide Levelshifterzweige ein Signal an den jeweils zugeordneten Eingang der Signalauswerteschaltung abgeben.
摘要:
A write driver 100, 200, 300 is implemented to provide near-ground common mode output voltages to produce a more symmetrical head voltage swing (i.e. ±0.4 V from ground to ±5 V supply voltages). These features help to reduce the effects of common mode impedance associated with the interconnection to the disk drive head to improve overall performance. Lower jitter at high data rates can be achieved when compared to prior art techniques for implementing current mode write drivers. Further, the matched impedance between the write driver 100 and the interconnection 106 eliminates unwanted reflections. ECL level voltage swings (200-500mV) have replaced more conventional CMOS level voltage swings (5V) to further reduce overall power dissipation associated with the write driver. The small ECL level switching further maintains constant power dissipation with changes in operating frequency and results in less NTLS effects due to quieter supplies.
摘要:
The present invention relates to an integrated circuit bidirectional switch formed from bipolar transistor devices, in which the saturation voltage is sought to be reduced. More specifically, an integrated NPN bipolar transistor is formed with oxide insulation, and the normal direction of current flow is from the emitter to collector, and an integrated PNP bipolar transistor is formed with oxide insulation, and the normal direction of current flow is from the collector to emitter.
摘要:
A drive circuit is provided for a magnetic head that has a bifilar winding with a center tap and is used for a magneto-optical disk drive. A magnetizing control signal MAGCH becomes the high level if there is no magnetic reversal during a period of a predetermined number of clocks and becomes the low level if there is a magnetic reversal. If the magnetizing control signal MAGCH is the low level, a high voltage VH is applied to the center tap of the bifilar winding 31 of the magnetic head via the transistor 39. The transistors 40, 41 or the transistors 42, 43 are turned on in accordance with write data signal DATA, *DATA. Therefore, the magnetizing current flows through one of the winding elements 31a and 31b. If the magnetizing control signal MAGCH is the high level, the transistors 46, 41 or the transistors 48, 43 are turned on in accordance with the write data signal DATA, *DATA. Therefore, the magnetizing current flows from the low voltage VL to both the winding elements 31a and 31b.
摘要:
An electric charge is supplied to or received from capacitors (C1, C2) when a piezoelectric element (C3) is charged or discharged by controlling transistors (Q17, Q18, Q15, Q10) which are in a first charging path (CL1) for charging from a power supply to the piezoelectric element (C3), a second charging path (CL2) for charging from the capacitors (C1, C2) to the piezoelectric element (C3), a first discharging path (DL1) for discharging from the piezoelectric element (C3) to ground (G) and a second discharging path (DL2) for discharging from the piezoelectric element (C3) to the capacitors (C1, C2), respectively.