Pulse sharing control to enhance performance in multiple output power converters is described herein. During a switching cycle, an energy pulse is provided to more than one port (i.e., output) using pulse sharing transfer. Pulse sharing transfer may enhance performance by reducing audible noise due to subharmonics and by reducing a root mean square current of one or more secondary currents. A primary switch is closed to energize an energy transfer element via a primary current. Energy may be shared among a first load port on a first circuit path via a first secondary current and among a second load port on a second circuit path via a second secondary current.

A circuit for a multi-phase power regulator including a power stage with a first phase and a second phase, the circuit including phase management circuitry coupled to the first phase and the second phase to control the first phase and the second phase, a first comparator coupled to an output of the multi-phase power regulator to compare a value of the output of the multi-phase power regulator to a first threshold value to produce a first comparison result, and phase shedding circuitry coupled to the first comparator and the phase management circuitry to control the phase management circuitry to activate or deactivate the second phase based at least partially on the first comparison result.

A fully isolated drive circuit to be used for regulating an output voltage across a load. The isolated drive circuit may charge, discharge, or preserve the load charge using a controller that controls one or more switches. The controller may operate a switch according to an internal/external clock or an external control signal received by the controller. The isolated drive circuit may be an effective solution to simplify the drive design and decrease the amount of energy dissipated by the drive, especially when the load, associated with the drive, requires a high input voltage level.

The present disclosure provides a three-phase AC/DC converter aiming for low input current harmonic. The converter includes an input stage for receiving a three-phase AC input voltage, an output stage for at least one load, and one or more switching conversion stages, each stage including a plurality of half bridge modules. The switches in each module operate with a substantially fixed 50% duty cycle and are connected in a specific pattern to couple a DC-link and a neutral node of the input voltage. The AC/DC converter further includes one or more controllers adapted to vary the switching frequency of the switches in the switching conversion stages based on at least one of load voltage, load current, input voltage, and DC-link voltage. The converter can also include one or more decoupling stages, such as, inductive components adapted to decouple the output stage from the switching conversion stages.

A driving circuit for driving a piezoelectric load, can include: a rechargeable power supply; a power stage circuit coupled between the rechargeable power supply and the piezoelectric load; where during a first operation interval of an operation period, the rechargeable power supply charges the piezoelectric load through the power stage circuit, such that a power supply voltage signal provided to the piezoelectric load in the first operation interval corresponds to a reference voltage in a first interval; and where during a second operation interval of the operation period, the piezoelectric load charges the rechargeable power supply through the power stage circuit, such that the power supply voltage signal in the second operation interval corresponds to the reference voltage in a second interval.

This disclosure describes systems, methods, and apparatus for controlling a voltage provided to a plurality of configurable output modules using a resonant converter, the resonant converter comprising: an inverter circuit; a resonant capacitor bridge coupled across the inverter circuit; N groups of output modules, each of the N groups comprising terminals configured for coupling to up to M output modules, the output modules each comprising: a transformer having a primary and a secondary; and a rectified output coupled to the secondary and configured for coupling to a load; and a resonant inductor network configured to be coupled between the resonant capacitor bridge and the primaries of the transformers, the resonant inductor network comprising: at least one parallel inductor; and N parallel branches arranged in parallel and each branch comprising a series inductor, each of the series inductors configured for transformer-coupling to up to M output modules.

A power conversion apparatus connected to three or more voltage units, includes three or more power conversion circuits connected to respective units of the three or more voltage units; and a multiport transformer connected to the three or more power conversion circuits at mutually different ports, in which at least one voltage unit of the three or more voltage units is an electrical load.

The present closure provides a switching mode power supply including a primary circuit unit comprising an input circuit proving an input voltage and a semiconductor switch conducting or cutting off the input circuit, a transformer comprising a primary winding connected to the primary circuit unit and a plurality of secondary windings magnetically connected to the primary winding, a plurality of secondary circuit units respectively connected to the secondary windings and supplying a plurality of output voltages, a feedback circuit unit receiving one of the output voltages as feedback and calculating a compensation voltage for constantly controlling the output voltages, a control unit controlling on/off a duty ratio of the semiconductor switch according to the compensation voltage, and a protection circuit unit receiving one of the output voltages to determine whether the feedback circuit unit fails and to cut off, when the feedback circuit fails, power of the control unit.

A multi-output AC/DC adapter can include a main power stage that receives power from an AC power source and delivers an intermediate output voltage, a plurality of regulator stages each comprising a chopper circuit that receives the intermediate output voltage and produces a regulated output DC voltage for one of the multiple outputs, and a controller. The main power stage can be a flyback converter, and the intermediate output voltage can be derived from a secondary winding of a flyback transformer of the flyback converter. The controller can provide a voltage reference signal and a feedback signal to the feedback loop of the main power stage, and the feedback signal can be an output voltage of one of the regulator stages. The controller can also provide a voltage reference signal to the controller of each of the regulator stages..

A bidirectional DC-DC converter with three or more ports is described along with a method of operation thereof. The converter utilizes a common transformer for all ports and allows for power transfer from any port to any or all of the remaining ports. The converter may utilize a controller which implements variable-frequency control, delay-time control, and/or phase-delay control to achieve power transfer as desired between the converter ports. In some cases, power transfer between ports can operate similar to a series-resonant converter or a dual active bridge converter.