摘要:
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.
摘要:
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, f 0 , 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, f R, such that 0.2 0 /f R
摘要:
An inverter for inductive power transfer is disclosed. The inverter comprises a first inductor and a switching element in series between power supply terminals, the switching element being operable to be switched at a first frequency; a first capacitance in parallel with the switching element between the first inductor and a power supply terminal; a first tank circuit in parallel with the first capacitance, the first tank circuit comprising a second inductor and a second capacitance, wherein the second capacitance is arranged in series with the second inductor; a second tank circuit in parallel with the first capacitance; and a third capacitance in series with the first inductor between the first tank circuit and the second tank circuit, wherein the second tank circuit comprises a transmitter coil and a fourth capacitance, the fourth capacitance being arranged in parallel or series with the transmitter coil; wherein the fourth capacitance is selected such that the resonant frequency of the second tank circuit is not equal to the first frequency, and wherein the second inductor and the second capacitance are selected such that the resonant frequency of the first tank circuit is an integer multiple, greater than one, of the first frequency.
摘要:
A rectifier for wireless power transfer is disclosed. The rectifier comprises an electromagnetic signal receiving element operable to be driven with an electromagnetic signal oscillating at a first frequency; a first tank circuit comprising a first inductor and a first capacitance in series; a second tank circuit in parallel with the electromagnetic signal receiving element, the second tank circuit comprising a second inductor and a second capacitance in series; a third capacitance in parallel with the electromagnetic signal receiving element; and a rectifying element in parallel with the first capacitance, wherein: the first inductor is in series with the electromagnetic signal receiving element between the electromagnetic signal receiving element and the second tank circuit, the first capacitance is between the second tank circuit and the third capacitance, and the second inductor and the second capacitance are selected such that the resonant frequency of the second tank circuit is an integer multiple, greater than one, of the first frequency.