Abstract:
Die vorliegende Erfindung betrifft einen Gleichspannungswandler, sowie ein Verfahren zur Ansteuerung eines Gleichspannungswandlers mit hoher Spannungsfestigkeit sowie verringerten Leistungsverlusten. Hierbei wird eine optimierte Ansteuerung eines Potential-trennenden Multilevel-Halbbrückenwandlers gemäß einer Phase-Shifted Full-Bridge Konfiguration mit einem neuartigen Modulationsverfahren vorgeschlagen.
Abstract:
A soft switching half bridge switching cell. Further this soft switching half bridge cell contains at least two synchronous rectifiers in the secondary which are conducting together during the dead time of the primary switchers creating a short circuit across the secondary windings, trapping the magnetizing current and release the magnetizing current to discharge the parasitic capacitances across the primary switchers when the synchronous rectifiers turn off the secondary windings are connected to a synchronized and controlled current source. The current demanded by the current source is shaped in such way that the current becomes zero before the synchronized rectifiers turn off and create zero voltage switching conditions for the primary switchers and further charge in a monotonic way the parasitic capacitances of the secondary synchronous rectifiers without ringing and spikes.
Abstract:
A battery charger (1) comprising input terminals (8) for connection to an AC source (2) supplying an alternating input voltage, output terminals (9) for connection to a battery (3) to be charged, and a PFC circuit (12) connected between the input terminals (8) and the output terminals (9). The battery charger (1) monitors the voltage of the battery (3) and operates in a first mode when the voltage is below a threshold. The battery charger (1) then switches to a second mode when the voltage exceeds the threshold. The PFC circuit (12) regulates an input current drawn from the AC source (2) such that the waveform of the input current when operating in the first mode is different to that when operating in the second mode.
Abstract:
Gleichspannungswandler (1), aufweisend: - einen Ausgangsanschluss, wobei der Ausgangsanschluss einen ersten Ausgangsanschlusspol (2) und einen zweiten Ausgangsanschlusspol (3) aufweist, - eine Anzahl von Gleichrichterelementen (D1, D2), - eine Spannungsbegrenzungseinheit (3) mit einem elektrischen Energiespeicher (C1), wobei die Spannungsbegrenzungseinheit (3) dazu ausgebildet ist, Spannungen an den Gleichrichterelementen (D1, D2) zu begrenzen, und - eine getaktete Energiereglereinheit (4), die dazu ausgebildet ist, in dem elektrischen Energiespeicher (C1) gespeicherte Energie auf einen Sollwert zu regeln.
Abstract:
An inductive power receiver having a power pick-up stage and a power rectification and regulation stage consisting of a single current control element configured to rectify the voltage from the power pick-up stage in a first half cycle and to regulate the voltage from the power pick-up stage in a second half cycle.
Abstract:
An isolated switching power converter is provided wherein a secondary side is valley mode switched to transmit data to a primary side. This provides secondary side regulation without the need for an optocoupler. Data communication between the primary and secondary sides of switching power converters is presented.
Abstract:
L'invention concerne un convertisseur de tension (1) comprenant: un circuit convertisseur DC/DC isolé(3) ayant au moins un premier transformateurd'isolation(T1) et des interrupteurs (M31, M32) dont des successions d'ouverture et de fermeture avec au moins unrapport cyclique (α) permettent de transmettre une énergie à travers le convertisseur DC/DC isolé (3)par l'intermédiaire dudit premier transformateur (T1); un circuit de régulation (2) de la tension d'entrée du circuit convertisseur DC/DC isolé (3); le circuit de régulation (2) étant configuré pour contrôler la tension de sortie (Vout) du circuit convertisseur DC/DC isolé (3)en modifiant la tension délivrée au circuit convertisseur DC/DC isolé (3), le rapport cyclique (α) du circuit convertisseur DC/DCisolé(3) restant constant, et dans ledit convertisseur (1), la sortie du circuit de régulation est connectée à une branche du circuit convertisseur DC/DC isolé comprenant ledit premier transformateur (T1).
Abstract:
A unit ant a method for synchronous rectification control unit is disclosed. The synchronous rectification control unit includes a voltage sensing circuit 25 configured to detect body diode conduction for a power switch 14, and to output a voltage pulse signal V DC corresponding to the body diode conduction. The synchronous rectification control unit further includes a capture unit 24 configured to determine a time duration T c for the voltage pulse signal V DC , and to store the time duration T c in a memory. The synchronous rectification control unit further includes a control algorithm circuit 26 configured to determine a turn-on time T on and a turn-off time T off to be used for a synchronous pulse width modulation, PWM, control signal SQ1 or a non-synchronous PWM control signal Q1 during an upcoming switching cycle, wherein the determination of the turn—on T on and turn—off T off times is based on the stored time duration T c . The synchronous rectification control unit further includes a PWM signal generator 32 configured to generate, by use of the determined turn-on T on time and turn-off T off time, the synchronous PWM control signal SQ1 for controlling switching of the power switch 14 when the power switch is in a synchronous side of a circuit; or the non-synchronous PWM control signal Q1 for controlling switching of the power switch 14 when the power switch is in a non-synchronous side of the circuit 100.
Abstract:
A synchronous rectifier circuit (101) is provided, comprising: a switch module (10), configured to generate a switch voltage signal; an LLC resonance module (20), configured to generate a first resonance pulse voltage signal according to the switch voltage signal; a transformer (30) comprising a primary winding (T1) and a secondary winding (T2), and configured to convert the first resonance pulse voltage signal into a second resonance pulse voltage signal; a secondary synchronous rectifier module (40) and a reverse current suppression module (50). The secondary synchronous rectifier module (40), the reverse current suppression module (50) and the secondary winding (T2) are connected with each other to form a reverse current suppression loop, the secondary synchronous rectifier module generates a reverse recovery current signal during performing a synchronous rectification to the second resonance pulse voltage signal, and the reverse current suppression loop is configured to suppress the reverse recovery current signal..