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Charger with inductive power transmission for batteries in a mobile electrical device
| Details |
Inventors: Brockmann, Hans-Jurgen; Turtiainen, Heikki;
Assignee: Perdix Oy (Helsinki, FI)
Primary Examiner: Wong; Peter S.
Assistant Examiner: Toatley, Jr.; Gregory J
Attorney, Agent or Firm: Ware, Fressola, Van Der Sluys & Adolphson LLP
The invention concerns a charger (CU) for batteries (A) in an electrical mobile device (MU), wherein a power oscillator (OSZ) produces an alternating magnetic field with the primary part (W.sub.PRI) of an inductive coupler, for the inductive transmission of charging power. By alternatingly receiving power for charging the batteries (A), the mobile device (MU) which is coupled to the charger (CU), charges the entire inductive coupler via its secondary coupler part (W.sub.SEC). The charger (CU) contains detection means (SEL, AMP, RE and FE-DEM) which generate at least one control signal (S.sub.C 1, S.sub.C 2) when the inductive load of the coupler is periodically changed in order to switch the power level, which is inductively transmitted by the charger (CU) to the mobile device (MU), from a low average value in the stand-by mode to a higher average value for the charging operation. |
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DETAILED DESCRIPTION Starting with the indicated defect, the object of the invention is to create a solution which very reliably and by simple means detects a corresponding connected mobile device and the charge condition of the batteries, in order to switch from a stand-by mode with reduced power transmission to a charging mode with full power transmission.
To attain this objective the charger contains detection means which generate at least one control signal with a periodic change of the inductive power consumption by the mobile device as a function of a frequency, in order to switch the power, which the charger inductively transmits to the mobile device, from the stand-by mode to a charging mode with full power output.
The mobile device periodically changes the current that flows from the secondary part of an inductive coupler to the batteries, independently of the power oscillator's frequency, so that the coupler's charge and thus its power consumption alternate accordingly.
This can simply be done with a secondary electronic switch such as a power-FET, which is located to advantage in the high-frequency AC branch between the secondary coupler part and the charging rectifier.
A pulsating control voltage periodically connects the secondary coupler part with the charging rectifier, so that the load of the entire coupler alternates between no load and full load.
Advantageously the load change takes place with a cycle duration which on the one hand is below the oscillating frequency of the power oscillator.
This alternately changes the load of the alternating magnetic field for the respective duration of several periodic oscillations.
The actual power is thus obtained in oscillation packets, so-called bursts.
On the other hand the duration of the cycle is chosen to be sufficiently short so that the sequence of the oscillation packets can easily by identified as an alternating signal.
The alternating load causes corresponding changes in the mutual inductance of the primary part of the inductive coupler
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