Inductive power transfer system

摘要

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.

主权项

1. 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 an 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 a control loop speed according to the operating frequency determined in step c).