Transient protection apparatus and method for wireless power transfer system
AssigneeNuVolta Technologies (Hefei) Co., Ltd.
InventorZhijun Luo
Life of this patent
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Abstract
A method includes in a switching cycle of a power converter in a wireless power transfer system, finding a time instant corresponding to one fourth of the switching cycle, wherein the power converter is coupled between an input power source and a transmitter coil magnetically coupled to a receiver coil, at the time instant, detecting a current flowing through the transmitter coil, wherein power transferred between the transmitter coil and the receiver coil is proportional to the current flowing through the transmitter coil, comparing the current flowing through the transmitter coil with a plurality of predetermined thresholds to determine whether a transient occurs, and applying a control mechanism to the power converter in response to an occurrence of the transient.
Claims20
An apparatus comprising:
- a transmitter coil configured to be magnetically couple to a receiver coil;
- a power conversion device coupled to the transmitter coil;
- and
- a controller configured to control a operating variable of the power conversion device in response to a operating condition change, wherein the controller comprises a one-fourth cycle detection block configured to set up a current sensing time instant corresponding to one fourth of a switching cycle of the power conversion device, and wherein at the current sensing time instant, a current flowing through the transmitter coil is detected and compared with a plurality of predetermined thresholds to determine which type of transient occurs.
A method comprising:
- in a switching cycle of a power converter in a wireless power transfer system, finding a time instant corresponding to one fourth of the switching cycle;
- at the time instant, detecting a current flowing through a transmitter coil of the wireless power transfer system;
- comparing the current flowing through the transmitter coil with a plurality of predetermined thresholds;
- and
- applying a control mechanism to the power converter based on comparing results of the step of comparing the current flowing through the transmitter coil with a plurality of predetermined thresholds.
A method comprising:
- in a switching cycle of a power converter in a wireless power transfer system, finding a time instant corresponding to one fourth of the switching cycle, wherein the power converter is coupled between an input power source and a transmitter coil magnetically coupled to a receiver coil;
- at the time instant, detecting a current flowing through the transmitter coil, wherein power transferred between the transmitter coil and the receiver coil is proportional to the current flowing through the transmitter coil;
- comparing the current flowing through the transmitter coil with a plurality of predetermined thresholds to determine whether a transient occurs;
- and
- applying a control mechanism to the power converter in response to an occurrence of the transient.
Dependencies are inferred from the claim text.