WIRELESS POWER SYSTEM

• US 20150214750A1
• Filed: 01/28/2015
• Published: 07/30/2015
• Est. Priority Date: 01/28/2014
• Status: Abandoned Application

• Current Assignee: Powermat Technologies, Ltd.
• Original Assignee: Powermat Technologies, Ltd.
• Inventors: MOSHKOVICH, Oz, ROFE, Arik, MACH, Elieser, KOREN, Yuval, RAVEH, Guy, NUDELMAN, Arye, BURDO, Rinat, SHRAGA, Rotem
• Application Number:
  US14/607,808
• Publication Number:
  US 20150214750A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00045 Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source

Abstract

A wireless power system comprising a secondary unit and a wireless power outlet configured to provide an electric charge wirelessly to the secondary unit comprises a primary inductive coil connected to a power source via a driver configured to provide an oscillating driving voltage to the primary inductive coil. The secondary unit is configured to receive an electric charge wirelessly from the wireless power outlet, and comprises a secondary inductive coil wired to an electric load. The wireless power outlet and secondary unit are each configured to ensure compatibility with one another.

Claims

1. A wireless power outlet configured to provide an electric charge wirelessly to a secondary unit, the wireless power outlet comprising a primary inductive coil connected to a power source via a driver configured to provide an oscillating driving voltage to said primary inductive coil, the wireless power outlet being characterized by one or more selected from the group consisting of:

peak voltage across said primary inductive coil changes by at least 3V when a secondary inductive coil of said secondary unit is within a predetermined distance thereof;

a transition time between “

Standby” and

“

Power Transfer”

operational phases thereof does not exceed one second;

a response to a change request from said secondary unit is responded to by said wireless power outlet within 150 ms; and

receipt thereby of an invalid signal results in termination of power transfer.

2. A secondary unit configured to receive an electric charge wirelessly from a wireless power outlet, said unit comprising a secondary inductive coil wired to an electric load and being characterized by one or more selected from the group consisting of:

placement thereof on a surface of the wireless power outlet induces a difference of at least −

40 Gauss in a DC magnetic field thereof;

an output of said secondary inductive coil remains closed until a signal, identifying itself as compliant with said wireless power outlet, is transmitted and a predetermined period of time elapses;

receipt of a digital ping from said wireless power outlet induces a response having a frequency of at least 7.6 kHz and no greater than 8.4 kHz;

an “

Identification”

operation phase thereof comprises transmitting, within 180 ms, signals indicating one or more of requesting increased power, requesting decreased power, and requesting no change in power until a stabilized operational point is reached, followed by a signal identifying itself as compliant with said wireless power outlet;

a request is transmitted by said secondary unit when it determines that a power level transmitted by said wireless power outlet should be changed;

a charging state is maintained until the earlier of said electric load reaches full power and said charging state has been maintained for two hours;

no audible sounds are emitted by said secondary unit during normal operation thereof which exceed a sound pressure level of 30 at a distance of one meter;

when charging of said electric load is complete, said secondary unit closes an output of the secondary inductive coil thereof and transmits a signal indicating end of charge;

a signal indicating end of charge is transmitted by said secondary unit when a predetermined error condition is detected;

the secondary unit is configured to transmit a signal identifying itself as compliant with said wireless power outlet upon receiving a digital ping therefrom 25 ms after transfer thereto of electric power terminates; and

no more than 8.5 W are drawn by said secondary unit from the wireless power outlet.