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Method and device for wirelessly supplying power to a load

A power supply and power technology, applied in the field of wireless transmission, can solve the problems of excessive transmission power and waste

Inactive Publication Date: 2017-06-20
ANALOG DEVICES INT UNLTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Another problem with prior art transmitting systems for wirelessly transmitting power to a load is that the transmitted power is typically set for worse case load conditions
Therefore, if the load on the receiver side does not require much power, the transmit power is excessive and wasted

Method used

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  • Method and device for wirelessly supplying power to a load
  • Method and device for wirelessly supplying power to a load
  • Method and device for wirelessly supplying power to a load

Examples

Experimental program
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Embodiment Construction

[0041] simple resonant circuit

[0042] image 3 It is shown that the voltage source 16 generates the LC natural frequency (f n = 1 / 2π√LC) drives the square wave of the simple LC resonant circuit 18. voltage source 16 and has figure 2 Ideal versions of switches SW-A and SW-B in . In steady state and at 50% duty cycle of each switch (for maximum current), Figure 4 The voltage at the SW node and the current through the inductor L are shown in . One characteristic that is clear from the waveforms is that in steady state the switching waveform at the SW node and the sinusoidal current through the inductor L are fundamentally in-phase.

[0043] Figure 5 Demonstrated in a half-bridge configuration image 3 , where the on-resistances of switches SW-A and SW-B are each equal to Rs. If SW-A and SW-B are driven at the LC natural frequency at a 50% duty cycle, then in steady state the voltage at the SW node and the current through the inductor L are related to Figure 4 The s...

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Abstract

The present invention provides an automatic resonant driver for a transmitter inductor that drives the inductor at an optimal frequency for maximum efficiency. The transmitter inductor is coupled magnetically rather than physically to a receiver inductor, and the current generated by the receiver inductor is used to power a load. For example, the system can be used to remotely charge a battery (as part of the load) or provide power to a motor or circuit. A feedback circuit is used to generate the resonant drive frequency. A detector in the transmit side wirelessly detects whether sufficient current is being generated in the receiver side to effect regulation by a voltage regulator to power the load. This is achieved when the transmitter inductor peak voltage increases abruptly as the drive pulse width ramps up. At that point, the pulse width is held constant for optimal efficiency.

Description

technical field [0001] The present invention relates to the wireless transmission of power to devices, such as for recharging batteries in portable devices or remotely powered devices, and in particular to such systems using auto-resonant power transmitters. Background technique [0002] Recently, there has been increasing interest in developing wireless power transfer systems to power everything from consumer electronics, such as cell phones, to heavy industrial equipment, such as electric motors at the end of cranes. The main driving force behind this interest is the ability of such wireless power transfer systems to remove the direct electrical contact necessary to deliver power from a source to a load in traditional wire-connected systems. The removal of this electrical contact promises many advantages, including convenience, reduced maintenance costs, and reliability. [0003] exist figure 1 In a typical wireless power transfer system shown in , a transmitter circuit ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/02H01F38/14
CPCH02J7/025H02J50/12B60L58/18H02J7/00304H02J7/00308Y02T10/70Y02E60/10H04B5/79H02J7/0016H02J7/0024H01M10/441H02J7/00H01F38/14
Inventor E·T·利苏瓦迪
Owner ANALOG DEVICES INT UNLTD