Abstract: There is provided a converter for converting a received RF signal into a DC signal for powering a load, the converter comprising: a rectifier arranged to generate, based on the RF signal, the DC signal and one or more harmonics of the RF signal, and to output the DC signal and the one or more harmonics together with a component of the RF signal; a first planar transmission line arranged to guide the received RF signal to the rectifier; and a second planar transmission line arranged to receive from the rectifier the DC signal, the component of the RF signal and the one or more harmonics from the rectifier, and to reflect the one or more harmonics back towards the rectifier. The first planar transmission line is further arranged to reflect back towards the rectifier RF signals from the rectifier that are based on the reflected signals. The converter further comprises a low-pass filter for supplying the DC signal to the load, the low-pass filter comprising an inductor and a third planar transmission line that.

Abstract: There is provided a dual-band converter operable to convert a first RF signal in a first frequency band and a second RF signal in a second frequency band that is separate from the first frequency band into a DC signal for powering a load.

Abstract: An antenna apparatus for harvesting ambient radio frequency, RF, energy, comprises one or more RF antenna components arranged to receive RF energy. The antenna components comprise a plurality of frequency filtering components, each filtering a respective frequency band of the received RF energy. A rectifying circuit is arranged to convert a variable electrical signal received at an input from an associated antenna, into a direct current electrical signal for supplying to an electrical energy storage unit. A power management module has an input arranged to receive the direct current and control supply of the direct current to the electrical energy storage unit. The rectifying circuit comprises a plurality of transmission lines, and the input of the rectifying circuit and the input of the power management module are connected via the transmission lines. The power management module is arranged at least partially within a boundary defined by the transmission lines.

Abstract: An inductive power transfer system comprises a transmitter circuit comprising a transmitter coil and a receiver circuit comprising a receiver coil spaced from the transmitter coil. The transmitter circuit is in the form of a Class E amplifier with a first inductor and a transistor in series between the terminals of a power supply. A first transmitter capacitance is in parallel with the transistor between the first inductor and a power supply terminal, a primary tank circuit in parallel with the first transmitter capacitance, the primary tank circuit comprising the transmitter coil and a second transmitter capacitance arranged in parallel with the transmitter coil, and a third transmitter capacitance in series with the first inductor between the first transmitter capacitance and the primary tank circuit. The second transmitter capacitance is selected such that a resonant frequency of the primary tank circuit is not equal to the first frequency.

Abstract: A rectifier for wireless power transfer is disclosed.

Abstract: An inverter for inductive power transfer is disclosed.

Abstract: An antenna apparatus for harvesting ambient radio frequency, RF, energy, comprises one or more RF antenna components arranged to receive RF energy. The antenna components comprise a plurality of frequency filtering components, each filtering a respective frequency band of the received RF energy. A rectifying circuit is arranged to convert a variable electrical signal received at an input from an associated antenna, into a direct current electrical signal for supplying to an electrical energy storage unit. A power management module has an input arranged to receive the direct current and control supply of the direct current to the electrical energy storage unit. The rectifying circuit comprises a plurality of transmission lines, and the input of the rectifying circuit and the input of the power management module are connected via the transmission lines. The power management module is arranged at least partially within a boundary defined by the transmission lines.

Abstract: Disclosed herein is an antenna apparatus for use in harvesting ambient radio frequency, RF, energy. The apparatus comprises one or more RF antenna components arranged to receive RF energy for producing electricity. The one or more RF antenna components comprise a plurality of frequency filtering components, each frequency filtering component being arranged to filter a respective frequency band of the received RF energy. Also disclosed herein is an apparatus comprising a rectifying circuit arranged to convert a variable electrical signal received at an input from an associated antenna into a direct current electrical signal for supplying to an electrical energy storage unit, the antenna for use in harvesting ambient radio frequency, RF, energy. The apparatus also comprises a power management module having an input arranged to receive the direct current and control supply of the direct current to the electrical energy storage unit.

Abstract: The present invention provides a portable processing device comprising a journey type determining module, a journey length determining module and a communication module. The journey type determining module is operable to determine whether a journey undertaken by a person carrying the portable processing device is an environmentally-friendly journey comprising a journey undertaken in an environmentally-friendly vehicle, a journey undertaken using self-propelled means or a journey undertaken on foot. The journey length determining module is operable to determine a length of a said environmentally-friendly journey under-taken by the person carrying the portable processing device. The communication module is operable to transmit journey data to record management apparatus defining the length of the environmentally-friendly journey undertaken by the person carrying the portable processing device.

Abstract: There is provided a near-field inductive power transfer system (10), comprising a power transmission device (100) arranged to transmit power wirelessly at a first frequency, f0, and a power reception device (200) arranged to receive power transmitted by the power transmission device (100). The power reception device (200) is moveable relative to the power transmission device (100) and comprises a receiver circuit (210) configured to receive power for powering a variable load (230) when the power reception device (200) is in a near-field region of the power transmission device (100), the receiver circuit being a resonant circuit with a resonant frequency, fR, such that 0.2<f0/fR<3.

Abstract: A peripheral device capable of being worn, carried by a user, or used in an in-vehicle computer system operates in conjunction with an application to acquire, store, and present data relevant to a user's health, physical activity, environment, air quality, or other parameters of interest. For power efficient operation and enhanced performance, control parameters of the peripheral device such as duty cycle, sampling rate, and sleep state may be wirelessly and automatically controlled by the mobile device. Furthermore, the mobile application can provide a wireless energy signal to the peripheral device to recharge the battery of the peripheral device. The control parameters may be automatically controlled by the mobile application dependent on the user's location, activity, mode of transportation or other parameters without intervention from a user.

Abstract: The invention relates to an inductive power transfer transmitter comprising class-E amplifier driver arranged to drive a primary tank circuit including a transmitter coil, in which the driver frequency is tuned to drive the primary tank circuit when the primary tank circuit is in an unloaded condition.

Abstract: Disclosed herein is an antenna apparatus for use in harvesting ambient radio frequency, RF, energy. The apparatus comprises one or more RF antenna components arranged to receive RF energy for producing electricity. The one or more RF antenna components comprise a plurality of frequency filtering components, each frequency filtering component being arranged to filter a respective frequency band of the received RF energy. Also disclosed herein is an apparatus comprising a rectifying circuit arranged to convert a variable electrical signal received at an input from an associated antenna into a direct current electrical signal for supplying to an electrical energy storage unit, the antenna for use in harvesting ambient radio frequency, RF, energy. The apparatus also comprises a power management module having an input arranged to receive the direct current and control supply of the direct current to the electrical energy storage unit.

Abstract: An inductive power transfer system comprises a transmitter coil TX and a receiver coil RX spaced from the transmitter coil. A transmitter circuit comprises the transmitter coil and is in the form of a Class E amplifier with a first inductor Uchoke and a transistor in series between the terminals of a power supply, a first transmitter capacitor Cpar in parallel with the transistor between the first inductor and a power supply terminal, a primary tank circuit in parallel with the first transmitter capacitor, the primary tank circuit comprising the transmitter coil and a second transmitter capacitor Cres arranged in parallel with the transmitter coil, and a third transmitter capacitor Cser in series with the first inductor between the first transmitter capacitor and the primary tank circuit.