A detection method of a user of an apparatus is provided in which the apparatus is coupled to a charge variation sensor having a control unit and an electrode to detect an electric/electrostatic charge variation of the user. The detection method includes acquiring, through the electrode, a charge variation signal indicative of the presence of the user. A filtered signal is generated by filtering the charge variation signal. A feature signal is generated as a function of the filtered signal. A movement signal indicative of a movement of the user is generated as a function of the feature signal. A presence signal indicative of the presence of the user is generated as a function of the movement signal.

A detection method of a user of an apparatus is provided in which the apparatus is coupled to a charge variation sensor having a control unit and an electrode to detect an electric/electrostatic charge variation of the user. The detection method includes acquiring, through the electrode, a charge variation signal indicative of the presence of the user. A filtered signal is generated by filtering the charge variation signal. A feature signal is generated as a function of the filtered signal. A movement signal indicative of a movement of the user is generated as a function of the feature signal. A presence signal indicative of the presence of the user is generated as a function of the movement signal.

An orthopedic system configured for use in a pre-operative, intra-operative, and post-operative assessment. The orthopedic system comprises a first screw, a second screw, a first device, a second device, and a computer. The first device and the second device are respectively coupled to a first bone and a second bone of a musculoskeletal system. The first and second devices each include electronic circuitry, one or more sensors, and an IMU. A bracket, wrap, or sleeve can be used to hold the first and second devices to the musculoskeletal system. The first and second devices are configured to send measurement data to a computer. The first and second devices each have an antenna system. Electronic circuitry in the first or second devices are configured to harvest energy from a received radio frequency signal to recharge a battery to maintain operation.

An orthopedic system configured for use in a pre-operative, intra-operative, and post-operative assessment. The orthopedic system comprises a first screw, a second screw, a first device, a second device, and a computer. The first device and the second device are respectively coupled to a first bone and a second bone of a musculoskeletal system. The first and second devices each include electronic circuitry, one or more sensors, and an IMU. A bracket, wrap, or sleeve can be used to hold the first and second devices to the musculoskeletal system. The first and second devices are configured to send measurement data to a computer. The first and second devices each have an antenna system. Electronic circuitry in the first or second devices are configured to harvest energy from a received radio frequency signal to recharge a battery to maintain operation.

Wireless power transfer (WPT) efficiency is enhanced using an ultra-low power (ULP) distributed beamforming technique. A phase and frequency offset correction technique is used for beam-forming optimization, a backscattering communication technique is used to reduce power over-head, and a new rectifier and MPT method is used for high efficiency RF-to-DC conversion.

Wireless power transfer (WPT) efficiency is enhanced using an ultra-low power (ULP) distributed beamforming technique. A phase and frequency offset correction technique is used for beam-forming optimization, a backscattering communication technique is used to reduce power over-head, and a new rectifier and MPT method is used for high efficiency RF-to-DC conversion.

The present invention relates to a smartphone battery wireless charging system and application. The wireless charging application enables customers to purchase battery charge by paying a fee. The requested battery charge is provided wirelessly over-the-air using Wi-Fi by wireless charging base stations or using IoT devices and more. A server determines the battery capacity of the battery of a smartphone and based on the battery charge purchase request, battery charge is transmitted to the smartphone in the form of waves which are received by the smartphone and is converted into electric charge to recharge the battery. A user can pay a fee to receive, for example, 25%, 50%, 75%, or 100% battery charge. The charging of the phone is provided without an external connector thereby enabling individuals to use their phone for extended periods of time without running out of battery charge.

The present invention relates to a smartphone battery wireless charging system and application. The wireless charging application enables customers to purchase battery charge by paying a fee. The requested battery charge is provided wirelessly over-the-air using Wi-Fi by wireless charging base stations or using IoT devices and more. A server determines the battery capacity of the battery of a smartphone and based on the battery charge purchase request, battery charge is transmitted to the smartphone in the form of waves which are received by the smartphone and is converted into electric charge to recharge the battery. A user can pay a fee to receive, for example, 25%, 50%, 75%, or 100% battery charge. The charging of the phone is provided without an external connector thereby enabling individuals to use their phone for extended periods of time without running out of battery charge.

A radio frequency rectifier circuit including a rectifier circuit and a controller circuit is provided. The rectifier circuit receives a radio frequency signal and converts the radio frequency signal into a direct-current voltage serving as an output voltage. The rectifier circuit includes multiple power stages and multiple switch circuits. Each of the switch circuits is coupled between two of the power stages. The controller circuit is coupled to the rectifier circuit. The controller circuit outputs a control signal to control a conduction number of the switch circuits according to a value of the output voltage.

A wireless charging system may comprise a center console affixed in a vehicle. A layer assembly is attached to the center console. The layer assembly comprises a printed circuit board (PCB) that contains at least one amplifier, at least one filter, and at least one transmitting antenna. A power source is connected to the PCB and is activated at vehicle start or with the activation of a switch. The at least one transmitting antenna is oriented within 0 mm to 25.4 mm from an outer surface of the center console. The transmitting antenna produces a charging zone that emits power within an area that has a shape approximately equaling a cone and provides up to 25 watts of power to a mobile device that comprises a receiving antenna. The mobile device may be a cell phone, a wearable, a dongle, a wireless earbud, or a tablet.