An improved method of providing high burst power to audio amplifiers from limited power sources, using parallel power paths to increase system efficiency without need for a power path controller, thus utilizing a simplified circuit operation and maximizing average power available for both the amplifier and supporting circuitry.

A high voltage rectifier includes: a power divider (2) dividing power of high-frequency wave RF to be rectified; a capacitor (3) cutting-off direct current flowing between the power divider (2) and a first rectifier (10): and a capacitor (4) cutting-off direct current flowing between the power divider (2) and a second rectifier (20). The first rectifier (10) generates a direct-current voltage DC.sub.1 by rectifying a high-frequency wave RF.sub.1 output from the power divider (2), and outputs the direct-current voltage DC.sub.1 to one end of a load (7). The second rectifier (20) generates a direct-current voltage DC.sub.2 having a different polarity from that of the direct-current voltage DC.sub.1 by rectifying high-frequency wave RF.sub.2 output from the power divider (2), and outputs the direct-current voltage DC.sub.2 to the other end of the load (7).

Provided is a wireless power receiving unit with a self-regulation rectifier. In one embodiment, the wireless power receiving unit includes a resonator configured to receive wireless power; and a self-regulation rectifier unit including a rectifier configured to apply a rectifier output voltage to a load by converting alternating-current (AC) power received from the resonator into direct-current (DC) power, and a switching device located at a rear end of the rectifier and configured to self-regulate the rectifier output voltage.

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.

Systems and methods can include a transponder configured to communicate wirelessly with a receiver and sensor module (RSM), wirelessly communicate with a high-speed network, and radio-frequency (RF) powering of RSM. The high-speed network can include a wired network such as USB or Ethernet, or wireless network such as a Wi-Fi or cellular network. Additionally or alternatively, an antenna module can be configured to transmit radio-frequency (RF) power to a receiver configured to monitor a condition of a machine. A harmonic harvesting circuit design for harvesting unrectified AC power contained in the fundamental and harmonic at RF frequencies at the output of conventional rectifying circuits for storage and for powering of the entire RSM.

An integrated silicon carbide rectifier circuit with an on chip isolation diode. The isolation diode can be a channel-to-substrate isolation diode or a channel to channel isolation diode.

An improved method of providing high burst power to audio amplifiers from limited power sources, using parallel power paths to increase system efficiency without need for a power path controller, thus utilizing a simplified circuit operation and maximizing average power available for both the amplifier and supporting circuitry.

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.

An active voltage doubler utilizing a single supply op-amp for energy harvesting system is presented. The active voltage doubler is used for rectification of low power alternating energy sources to achieve both acceptably high power conversion efficiency (PCE) and large rectified DC voltage. The op-amp is self-biased, meaning that no external supply is needed but rather it uses part of the harvested energy for its biasing. Further, the rectified DC voltage is almost twice that of the conventional passive doubler. Power conversion efficiency versus load resistance is plotted and demonstrates that the self-biased active voltage doubler is at least twice as efficient as a conventional passive voltage doubler within the range of 20 to 50 K. The self-biased active voltage doubler achieves maximum power conversion efficiency (PCE) of 61.7% for a 200 Hz sinusoidal input of 0.8V for a 20 K load resistor.

Wireless communication system and method powered by an energy harvester. At least some of the example embodiments are methods including: receiving a burst of electrical energy from an energy harvester that produces the burst of electrical energy from mechanical energy, the burst of electrical energy the result of a single actuation of the energy harvester; rectifying the burst of electrical energy to create rectified energy; applying the rectified energy to the transceiver without applying the rectified energy to a switching power converter; and transmitting an electromagnetic switch including a frame of multiple bytes, the transmitting using the rectified energy. Additional embodiments can include a transceiver system including an energy harvester, a rectifier, a capacitor, and a transceiver, where the transceiver is configured to transmit an electromagnetic signal including a frame of a plurality of bytes during each burst of electrical energy.