Inductive power transfer system
AssigneeAlexsava Holdings Limited
InventorMark CHAPPELL
Life of this patent
Estimating the term…
Abstract
An inductive power transfer system comprises a primary side unit (1) and a secondary side unit (6) with a non-conductive barrier (5) therebetween, the primary side unit having a power supply (2), a transmission coil (4) and a controller (12). The secondary side unit has a receiver coil (7), a controller (8) and a load (9). The secondary side controller (8) is configured to detect the voltage in the receiver coil (7) and to transmit to the primary side controller (12) a control signal requesting an increase or decrease in the power transmitted from the primary side according to whether the voltage in the receiver coil (7) is above or below a predetermined value.
Claims9
An inductive power transfer system, comprising a primary side unit and a secondary side unit, the primary side unit having a switched mode power supply (SMPS), a transmission coil and a controller, and the secondary side unit having a receiver coil, a controller and a load, wherein the secondary side controller is configured to detect the voltage in the receiver coil and to transmit to the primary side controller a control signal requesting an increase or decrease in the power transmitted from the primary side according to whether the voltage in the receiver coil is above or below a predetermined value, and wherein the primary side controller is configured to set the initial operating frequency of the SMPS, on start-up, by
- a) Setting the operating frequency to a maximum value and gradually reducing the frequency until a control signal is received from the secondary side unit;
- b) Setting the secondary load to zero and determining the secondary voltage;
- c) Determining the operating frequency required to achieve the desired voltage in the secondary unit under a predetermined load;
- and
- d) Configuring the control loop speed according to the operating frequency so determined.
An inductive power transfer system, wherein the primary unit is configured to increase or decrease the power transmitted by increasing or decreasing the SMPS operating frequency in the transmission coil in response to said request.
Dependencies are inferred from the claim text.