Single stage rectification and regulation for wireless charging systems
First Claim
1. A rectification and regulation circuit for a wireless power receiver, the rectification and regulation circuit comprising:
- a coil physically separate from a primary coil of a power transmitter, such that magnetic coupling between the coil and the primary coil varies as a function of the physical proximity of the two coils;
a full-wave rectifier physically separate from the power transmitter and having a first pair of controllable rectifiers comprising a first transistor connected to the first terminal of the coil and a second transistor connected to the second terminal of the coil; and
a control unit physically separate from the power transmitter and operable to control switching of the transistors of the full-wave rectifier so that the full-wave rectifier (a) generates a rectified output for charging a battery of the wireless power receiver by rectifying current through the coil or voltage across the coil and (b) regulates the rectified output independent of any regulation done at the power transmitter.
2 Assignments
0 Petitions
Accused Products
Abstract
A rectification and regulation circuit for a wireless power receiver includes a coil, a full-wave rectifier circuit and a control unit. The full-wave rectifier has a first pair of controllable rectifiers including a first transistor connected to a first terminal of the coil and a second transistor connected to a second terminal of the coil. The control unit is operable to control switching of the transistors of the full-wave rectifier so that the full-wave rectifier (a) generates a rectified output for charging a battery of the wireless power receiver by rectifying current through the coil or voltage across the coil and (b) regulates the rectified output.
7 Citations
24 Claims
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1. A rectification and regulation circuit for a wireless power receiver, the rectification and regulation circuit comprising:
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a coil physically separate from a primary coil of a power transmitter, such that magnetic coupling between the coil and the primary coil varies as a function of the physical proximity of the two coils; a full-wave rectifier physically separate from the power transmitter and having a first pair of controllable rectifiers comprising a first transistor connected to the first terminal of the coil and a second transistor connected to the second terminal of the coil; and a control unit physically separate from the power transmitter and operable to control switching of the transistors of the full-wave rectifier so that the full-wave rectifier (a) generates a rectified output for charging a battery of the wireless power receiver by rectifying current through the coil or voltage across the coil and (b) regulates the rectified output independent of any regulation done at the power transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 21, 22, 23, 24)
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11. A method of rectification and regulation for a wireless power receiver using a circuit including a full-wave rectifier having a first pair of controllable rectifiers comprising a first transistor connected to a first terminal of a coil and a second transistor connected to a second terminal of the coil, the coil and the full-wave rectifier being physically separate from a primary coil of a power transmitter, the method comprising:
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mutual-inductively coupling the coil of the wireless power receiver to the primary coil of the power transmitter such that such that magnetic coupling between the coil and the primary coil varies as a function of the physical proximity of the two coils; switching the transistors of the full-wave rectifier so that the full-wave rectifier generates a rectified output for charging a battery of the wireless power receiver by rectifying current through the coil or voltage across the coil; and switching the transistors of the full-wave rectifier to regulate the rectified output independent of any regulation done at the power transmitter. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A wireless power receiver, comprising:
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a battery; a filter connected to the battery; a coil for charging the battery, the coil being physically separate from a primary coil of a power transmitter and configured such that magnetic coupling between the coil and the primary coil varies as a function of the physical proximity of the two coils; a full-wave rectifier physically separate from the power transmitter and connecting the coil to the filter, the full-wave rectifier having a first pair of controllable rectifiers comprising a first transistor connected to the first terminal of the coil and a second transistor connected to the second terminal of the coil; and a control unit physically separate from the power transmitter and operable to control switching of the transistors of the full-wave rectifier so that the full-wave rectifier (a) generates a rectified output for charging the battery by rectifying current through the coil or voltage across the coil and (b) regulates the rectified output independent of any regulation done at the power transmitter.
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Specification