A flipping-capacitor rectifier circuit that enhances an output power of a piezoelectric energy harvester (PEH). The flipping-capacitor rectifier circuit includes a flipping capacitor, a plurality of switches, and an active rectifier. The flipping capacitor is connected in parallel with the PEH and forms at least three reconfiguration phases by turning on one or more of the switches. The active rectifier connects with the flipping capacitor in parallel and rectifies an AC voltage of the PEH. The flipping capacitor flips a voltage across a capacitor of the PEH to enhance the output power of the PEH by extracting power from the capacitor of the PEH.

A wireless power transfer circuit can include an interphase transformer operatively coupled to a receiver coil, a rectifier, and a load. The receiver coil can be configured to have an alternating current induced therein by a transmitter coil. The interphase transformer can be configured to deliver a current to the load that is twice the current induced in the receiver coil, and the rectifier can be configured to rectify the current delivered to the load. The interphase transformer may be constructed with a center tapped winding structure or a bifilar winding structure, and may be constructed as a planar transformer. The rectifier may be made up of diodes (which may be Schottky diodes) or may be a synchronous rectifier comprised of switching devices such as MOSFETs.

The invention relates to an electric circuit arrangement for the input protection circuit of a switching power supply, having a surge protection circuit, which is contacted with a supply voltage on an input side and to which a current-compensated choke is connected as a suppression component, said current-compensated choke being connected to a rectifier circuit comprising an energy storage means on an output side.

Via modifications to the circuit technology, such as using two varistors as surge protections, and by using suitable switching elements, such as silicon diodes as rectifier elements and ceramic capacitors as an energy storage means, the input protection circuit is designed such that the requirements, which an expanded input voltage range demands of a surge circuit, are fulfilled.

Furthermore, the invention relates to a switching power supply having an electric circuit arrangement according to the invention for the input protection circuit.

A power conversion system is disclosed, which comprises at least one conversion unit comprising a converter unit and a first power interface boards; at least one measurement unit comprising a measurement board and a second power interface boards; and a controller comprising a processing unit, and a third power interface board communicated with the processing unit, and the first power interface board and the second power interface board, wherein at least some of the communications between the third power interface board and the first and second power interface boards have independent bandwidths.

An exemplary method of receiving wireless power from a wireless power transmitter includes, at a wireless power receiver having a controller, an antenna, a rectifier coupled with the antenna, and a boost converter coupled with the rectifier: (i) rectifying, by the rectifier, energy from wireless power transmission waves received by the antenna into a first voltage, (ii) increasing, by the boost converter, the first voltage to a second voltage based on instructions from the controller, and (iii) controlling, by the controller, an amount of increase in voltage from the first voltage to the second voltage based on a comparison.

In an example, a rectifier circuit includes first and second capacitors, first and second current control devices, and a switch. The first current control device is configured to provide an input current to the first capacitor during a positive cycle of an alternating current (AC) input voltage. The second capacitor is configured to store a charge and the switch is configured to couple the second capacitor to a ground terminal so the second capacitor discharges a capacitor current during the positive cycle of the input voltage responsive to the stored charge in the second capacitor. The second current control device is configured to provide the capacitor current to the first capacitor during the positive cycle of the input voltage. The first capacitor is configured to store a charge responsive to the input current and the capacitor current.

A playback circuit including a digital-to-analog converter (DAC), an amplifying output circuit and a control circuit coupled to both is provided. The DAC is configured to convert an input playback audio signal into an input analog playback audio signal according to a first control signal for controlling an upper limit of power consumption of the DAC. The amplifying output circuit is coupled to the DAC and configured to generate an output playback audio signal according to the input analog playback audio signal and a second control signal for controlling an upper limit of power consumption of the amplifying output circuit. The control circuit is configured to generate the first control signal and second control signal according to a volume value of the input playback audio signal, thereby controlling the upper limit of power consumption of the DAC and the upper limit of power consumption of the amplifying output circuit.

A harmonic harvesting circuit design for harvesting unrectified AC power contained in the fundamental and harmonic frequencies at the output of conventional rectifying circuits.

An electrical power conversion system for converting a high voltage from a HV electrical power supply to a low voltage is disclosed. In an embodiment, the electrical power conversion system includes at least one power converter and at least one RC network including a plurality of resistive components and a plurality of capacitive components electrically connected in series. In an embodiment, the at least one RC network is in series connection with the at least one power converter and the at least one RC network and at least one power converter are arranged to be connected across a line potential of the HV electrical power supply.

Converter with oscillator characterized in that it comprises an input (5) for connecting the phase through a first node (9) to cathode of a first diode (1) as well as to anode of a second diode (2), where the first diode (1) has anode connected through a third node (11) to anode of a third diode (3) as well as to a first output (17), wherein cathode of a third diode (3) is connected through a fourth node (12) to the anode of a fourth diode (4) as well as to neutral conductor (15) or to a second phase (16) as well as to a second output (18), wherein the fourth diode (4) has anode connected to a third output (19) and through a second node (10) to the cathode of the second diode (2), wherein parallelly to the second node (10) and to the third node (11) at least one oscillator circuit (20) comprising a bifilar coil (6) with a first winding (21) and a second winding (22) and at least one capacitor is connected. Another object of the invention is a system comprising a converter with oscillator and a load as well as a three-phase system.