This disclosure relates to switch mode multiphase DC-DC voltage regulator circuits. In prior art regulators, for standard load transients, the worst voltage undershoot happens during a zero to max, i.e., load step operation. When the load is released, the inductor current ramps down, eventually crossing zero, where it is then held at a negative current limit (i.e., NLIMIT) by a Negative Current Limit Detector Circuit. However, if the next load step were to happen right at the instant when the inductor hits the negative current limit, it would take additional time recover to zero before it could catch up to the load step, thus causing additional voltage drop. Regulators disclosed herein comprise specialized zero crossing detection circuitry that intelligently prevents the inductor currents in one or more of the phases of the regulator from ramping below zero, thereby improving voltage droop in the system during fast positive load transients.

The invention relates to a converter assembly comprising at least two converters (7, 7) and a control unit (1) connected to the converters (7, 7), wherein the control unit (1) is designed, continuously or at discrete time intervals, to transmit to the converters (7, 7) their permissible electrical power range, in particular their minimum power value P.sub.min and/or their maximum power value P.sub.max, to determine the current power balance of the individual converters (7, 7) or to receive it from same, and to adjust the permissible electrical power range of the converters (7, 7) in such a way that the power balance of the entire converter assembly does not leave a predefined range. The invention also relates to a method for operating a converter assembly of this type.

In some embodiments of the disclosed inverter topologies, an inverter may include a full bridge LLC resonant converter, a first boost converter, and a second boost converter. In such embodiments, the first and second boost converters operate in an interleaved manner. In other disclosed embodiments, the inverter may include a half-bridge inverter circuit, a resonant circuit, a capacitor divider circuit, and a transformer.

In some embodiments of the disclosed inverter topologies, an inverter may include a full bridge LLC resonant converter, a first boost converter, and a second boost converter. In such embodiments, the first and second boost converters operate in an interleaved manner. In other disclosed embodiments, the inverter may include a half-bridge inverter circuit, a resonant circuit, a capacitor divider circuit, and a transformer.

A method and device for controlling a resonant inductor for implementing ZVS in a push-pull parallel resonant inverter is closed. The present disclosure provides A device comprising: a converter including a full-bridge circuit in which a first switch and a second switch form a first leg and a third switch and a fourth switch form a second leg and configured to convert a DC into an AC by turning on or off the switches; a resonant inductor circuit including a resonant inductor and a resonant switch connected in series and connected between two output nodes of the converter; a transmission coil connected in parallel with the resonant inductor circuit; and a controller configured to convert the DC into the AC by providing a switching timing for turning on or off the switches and control a switching timing of the resonant switch based on switching timings of the switches.

A method and device for controlling a resonant inductor for implementing ZVS in a push-pull parallel resonant inverter is closed. The present disclosure provides A device comprising: a converter including a full-bridge circuit in which a first switch and a second switch form a first leg and a third switch and a fourth switch form a second leg and configured to convert a DC into an AC by turning on or off the switches; a resonant inductor circuit including a resonant inductor and a resonant switch connected in series and connected between two output nodes of the converter; a transmission coil connected in parallel with the resonant inductor circuit; and a controller configured to convert the DC into the AC by providing a switching timing for turning on or off the switches and control a switching timing of the resonant switch based on switching timings of the switches.

A parallel resonant inverter includes a first inductor, a first switch tube, a second switch tube, a parallel resonant module, a first isolation capacitor, and a second isolation capacitor. The first inductor, a drain of the first switch tube, a source of the first switch tube, and an external DC power supply are sequentially connected in series to form a first loop. The first inductor, the parallel resonant module, a drain of the second switch tube, a source of the second switch tube, and the external DC power supply are sequentially connected in series to form a second loop. The first inductor, the first isolation capacitor, an external load, the second isolation capacitor, the drain of the second switch tube, the source of the second switch tube, and the external DC power supply are sequentially connected in series to form a third loop.

A parallel resonant inverter includes a first inductor, a first switch tube, a second switch tube, a parallel resonant module, a first isolation capacitor, and a second isolation capacitor. The first inductor, a drain of the first switch tube, a source of the first switch tube, and an external DC power supply are sequentially connected in series to form a first loop. The first inductor, the parallel resonant module, a drain of the second switch tube, a source of the second switch tube, and the external DC power supply are sequentially connected in series to form a second loop. The first inductor, the first isolation capacitor, an external load, the second isolation capacitor, the drain of the second switch tube, the source of the second switch tube, and the external DC power supply are sequentially connected in series to form a third loop.