Isolated buck converters can be an efficient solution in applications that deal with wide variations in input and/or output voltage. The double ended embodiments of such converters can also offer improved transformer utilization. Such converters can be operated in fixed frequency DCM mode operation or variable frequency boundary conduction mode (BCM). The buck/energy storage inductor may be placed in series with primary or secondary winding of the isolation transformer The inherent leakage inductance of the isolation transformer may also utilized as part of the buck inductance. If the leakage inductance of the isolation transformer is sufficiently high (such as in wireless power transfer applications), such converters can use the leakage inductance as the buck inductor.

A method includes generating a PWM signal having a first edge to turn a transistor on and a second edge to turn the transistor off in respective switching cycles; determining a target turn on point and a target turn off point based on a measured electrical signal of the transistor responsive to the PWM signal of a switching cycle of a present control cycle; and adjusting the first edge and/or the second edge of the PWM signal for a switching cycle of a subsequent control cycle based on the determined target turn on point and/or the determined target turn off point.

Provided is a switch driving apparatus including a controller configured to individually control a first switch element and a second switch element included in a bidirectional switch, in which, when the controller stops on/off drive of the bidirectional switch, the controller turns off both the first switch element and the second switch element and then temporarily turns on one of the first switch element and the second switch element for a predetermined on time period.

Various embodiments of the present disclosure relate to power conversion using a planar transformer assembly that provides medium-voltage isolation at high frequencies. A planar transformer comprises primary and secondary planar windings configured to generate an isolated output. Each primary and secondary winding is interleaved on layers of a printed circuit board using one or more vias within the layers of the printed circuit board. The planar transformer also comprises a magnetic core and a field-shaping apparatus coupled with the printed circuit board. The field-shaping apparatus is configured to shape an electric field generated by the windings. The primary windings can be coupled to a DC source via switching devices while the secondary windings can be coupled via switching devices to one or more DC ports followed by AC inverters configured to generate three single-phase AC outputs for medium voltage applications.

A half-bridge power supply comprises: a first switch electrically connected to an energy source and to a load; a second switch electrically connected to the energy source and to the load; and circuitry electrically connected to the first and second switches and configured to provide a dynamic dead time for the half-bridge power supply based on one of the first and second switches being turned off having forward current.

Systems and methods for controlling a dual active bridge converter are disclosed herein. An output voltage of a dual active bridge converter is sensed. Based at least in part on the output voltage, a target intra-bridge phase shift amount between two bridges of the dual active bridge converter is computed. A plurality of switch control signals, which are provided to respective switches of the dual active bridge converter, are caused to switch according to a time-based switching sequence based on the target intra-bridge phase shift amount to compensate for variations in the output voltage.

According to an aspect, a power supply system includes a plurality of power converters configured to deliver a system load current to a load, where the system load current is a combination of individual load currents provided by the plurality of power converters, and a system performance controller configured to detect a value of the system load current. The system performance controller is configured to determine, using power loss information, values for the individual load currents such that a composite efficiency achieves a threshold condition. The system performance controller is configured to generate control signals to operate the plurality of power converters at the determined values.

The present disclosure discloses a current detecting circuit of a power converter, which includes a transformer including: a magnetic core, a primary winding and a secondary winding, the primary winding and the secondary winding being coupled through the magnetic core, and a combination of the primary winding, the secondary winding and the magnetic core being used to transmit a main power of the power converter, the current detecting circuit includes: an auxiliary winding coupled to the secondary winding, the auxiliary winding and the secondary winding having the same number of turns and their dotted terminals being connected; and an impeder, one end thereof being coupled to the auxiliary winding to form a series branch, which is coupled in parallel to the secondary winding, and a terminal voltage of the impeder after being filtered being proportional to a magnitude of an output current of the power converter.

A power converter can include a magnetic energy storage element, a main switch, a synchronous rectifier switch, and an energy recovery circuit. The energy recovery circuit can include a resonant circuit and an auxiliary switch configured to operate in conjunction with the main and synchronous rectifier switches to store energy in the resonant circuit and deliver energy therefrom to reduce switching losses associated with the main and synchronous rectifier switches. The converter can be a buck, boost, buck-boost, or other converter type. The auxiliary switch may be operated according to a two-pulse control mode or using a conventional buck converter controller with additional delay elements. The resonant circuit inductance may be a discrete inductor or a parasitic inductance, such as a PCB trace, which may be designed to provide a desired inductance value selected to efficiently provide sufficient energy to achieve reduced switching losses of the main and auxiliary switches.

The invention relates to an isolated resonant primary side switched converter (100), comprising a galvanic isolation stage (105), an auxiliary winding (L51-c) on the primary side (101) of the isolation stage (105) which is magnetically coupled to at least one secondary side winding (L51-b, L51-d) of the isolation stage (105), wherein the auxiliary winding (L51-c) is configured to detect a feedback signal as to a secondary side voltage, and a control unit (107) configured to sample the feedback signal, in each or every n.sub.th switching cycle, during a sampling period in which a current is flowing on the secondary side (103) of the isolation stage (105), and to process the sampled signal for a feedback control of the secondary side voltage by controlling the switching operation of a primary side switch (M40, M41).