MINIATURE HIGH VOLTAGE/CURRENT AC SWITCH USING LOW VOLTAGE SINGLE SUPPLY CONTROL
First Claim
1. A circuit for switching an ac signal, comprising:
- an input port, wherein the input port receives an input ac signal;
an output port;
a first transistor having a first source, a first drain, and a first gate, wherein the first source is coupled to the input port, wherein the first drain is coupled to the output port;
a second transistor having a second source, a second drain, and a second gate, wherein the second source is coupled to the input port, wherein the second drain is coupled to the output port;
a rectification network, wherein the rectification network receives the input ac signal, wherein the rectification network generates a maximum DC voltage that is approximately equal to a maximum input voltage of the input ac signal;
wherein the rectification network generates a minimum DC voltage that is approximately equal to a minimum input voltage of the input ac signal;
a first control network, wherein the first control network comprises a first control port, wherein the first control port receives a first control signal, wherein the first control network receives the maximum DC voltage and the minimum DC voltage from the rectification network, wherein the first control network outputs a first transistor control signal to the first gate, wherein the first transistor control signal is the maximum DC voltage when the first control signal is in an on state, wherein the first transistor control signal is the minimum DC voltage when the first control signal is in an off state;
a second control network, wherein the second control network comprises a second control port, wherein the second control port receives a second control signal, wherein the second control network receives the minimum DC voltage and the maximum DC voltage from the rectification network, wherein the second control network outputs a second transistor control signal to the second gate, wherein the second transistor control signal is the minimum DC voltage when the second control signal is in an on condition, wherein the second transistor control signal is the maximum DC voltage when the second control signal is in an off state, wherein when the maximum DC voltage is applied to the first gate, and the minimum DC voltage is applied to the second gate, the output port is connected to the input port, wherein when the minimum DC voltage is applied to the first gate, and the maximum DC voltage is applied to the second gate, the output port is disconnected from the input port.
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Abstract
Embodiments of the invention pertain to a method and apparatus for planar wireless power transfer where the receiver switches off and/or performs a duty cycle. In an embodiment, the switch can be used in a system that having a high voltage/current solid state switch, without having a high voltage control signal. An embodiment provides a switch that is capable of breaking, or greatly reducing, the connection of the receiver coil and the receiver circuitry in order to enable the receiver to decouple from the power transfer system. This embodiment can allow the transmitter to put out more power to other devices without providing power to the switched device. When the switch is used for a fully charged device, the switching can prevent or reduce damage to the fully charged device.
122 Citations
44 Claims
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1. A circuit for switching an ac signal, comprising:
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an input port, wherein the input port receives an input ac signal; an output port; a first transistor having a first source, a first drain, and a first gate, wherein the first source is coupled to the input port, wherein the first drain is coupled to the output port; a second transistor having a second source, a second drain, and a second gate, wherein the second source is coupled to the input port, wherein the second drain is coupled to the output port; a rectification network, wherein the rectification network receives the input ac signal, wherein the rectification network generates a maximum DC voltage that is approximately equal to a maximum input voltage of the input ac signal;
wherein the rectification network generates a minimum DC voltage that is approximately equal to a minimum input voltage of the input ac signal;a first control network, wherein the first control network comprises a first control port, wherein the first control port receives a first control signal, wherein the first control network receives the maximum DC voltage and the minimum DC voltage from the rectification network, wherein the first control network outputs a first transistor control signal to the first gate, wherein the first transistor control signal is the maximum DC voltage when the first control signal is in an on state, wherein the first transistor control signal is the minimum DC voltage when the first control signal is in an off state; a second control network, wherein the second control network comprises a second control port, wherein the second control port receives a second control signal, wherein the second control network receives the minimum DC voltage and the maximum DC voltage from the rectification network, wherein the second control network outputs a second transistor control signal to the second gate, wherein the second transistor control signal is the minimum DC voltage when the second control signal is in an on condition, wherein the second transistor control signal is the maximum DC voltage when the second control signal is in an off state, wherein when the maximum DC voltage is applied to the first gate, and the minimum DC voltage is applied to the second gate, the output port is connected to the input port, wherein when the minimum DC voltage is applied to the first gate, and the maximum DC voltage is applied to the second gate, the output port is disconnected from the input port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A receiver circuit, comprising:
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a receiver coil, wherein the receiver coil is capable of inductively coupling to a transmitter coil, wherein the receiver coil comprises an output port for outputting an input ac signal; a switch in series with the output port; load circuitry in parallel with the series combination of the output port and the switch, wherein the load circuitry is capable of coupling to a variable load, wherein the switch comprises; an input port, wherein the input port receives the input ac signal; an output port; a first transistor having a first source, a first drain, and a first gate, wherein the first source is coupled to the input port, wherein the first drain is coupled to the output port; a second transistor having a second source, a second drain, and a second gate, wherein the second source is coupled to the input port, wherein the second drain is coupled to the output port; a rectification network, wherein the rectification network receives the input ac signal, wherein the rectification network generates a maximum DC voltage that is approximately equal to a maximum input voltage of the input ac signal;
wherein the rectification network generates a minimum DC voltage that is approximately equal to a minimum input voltage of the input ac signal;a first control network, wherein the first control network comprises a first control port, wherein the first control port receives a first control signal, wherein the first control network receives the maximum DC voltage and the minimum DC voltage from the rectification network, wherein the first control network outputs a first transistor control signal to the first gate, wherein the first transistor control signal is the maximum DC voltage when the first control signal is in an on state, wherein the first transistor control signal is the minimum DC voltage when the first control signal is in an off state; a second control network, wherein the second control network comprises a second control port, wherein the second control port receives a second control signal, wherein the second control network receives the minimum DC voltage and the maximum DC voltage from the rectification network, wherein the second control network outputs a second transistor control signal to the second gate, wherein the second transistor control signal is the minimum DC voltage when the second control signal is in an on condition, wherein the second transistor control signal is the maximum DC voltage when the second control signal is in an off state, wherein when the maximum DC voltage is applied to the first gate, and the minimum DC voltage is applied to the second gate, the output port is connected to the input port, wherein when the minimum DC voltage is applied to the first gate, and the maximum DC voltage is applied to the second gate, the output port is disconnected from the input port. - View Dependent Claims (27, 28, 29, 30, 31, 32, 42)
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33. A receiver circuit, comprising:
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a receiver coil, wherein the receiver coil is capable of inductively coupling to a transmitter coil, wherein the receiver coil comprises an output port for outputting an input ac signal; a switch in parallel with the output port; load circuitry in parallel with the parallel combination of the output port and switch, wherein the load circuitry is capable of coupling to a variable load, wherein the switch comprises; an input port, wherein the input port receives the input ac signal; an output port; a first transistor having a first source, a first drain, and a first gate, wherein the first source is coupled to the input port, wherein the first drain is coupled to the output port; a second transistor having a second source, a second drain, and a second gate, wherein the second source is coupled to the input port, wherein the second drain is coupled to the output port; a rectification network, wherein the rectification network receives the input ac signal, wherein the rectification network generates a maximum DC voltage that is approximately equal to a maximum input voltage of the input ac signal;
wherein the rectification network generates a minimum DC voltage that is approximately equal to a minimum input voltage of the input ac signal;a first control network, wherein the first control network comprises a first control port, wherein the first control port receives a first control signal, wherein the first control network receives the maximum DC voltage and the minimum DC voltage from the rectification network, wherein the first control network outputs a first transistor control signal to the first gate, wherein the first transistor control signal is the maximum DC voltage when the first control signal is in an on state, wherein the first transistor control signal is the minimum DC voltage when the first control signal is in an off state; a second control network, wherein the second control network comprises a second control port, wherein the second control port receives a second control signal, wherein the second control network receives the minimum DC voltage and the maximum DC voltage from the rectification network, wherein the second control network outputs a second transistor control signal to the second gate, wherein the second transistor control signal is the minimum DC voltage when the second control signal is in an on condition, wherein the second transistor control signal is the maximum DC voltage when the second control signal is in an off state, wherein when the maximum DC voltage is applied to the first gate, and the minimum DC voltage is applied to the second gate, the output port is connected to the input port, wherein when the minimum DC voltage is applied to the first gate, and the maximum DC voltage is applied to the second gate, the output port is disconnected from the input port. - View Dependent Claims (34, 35, 43)
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36. A wireless power transfer system, comprising:
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a transmitter coil; driving circuitry, wherein the driving circuitry drives the transmitter coil to produce a time-varying magnetic field; a receiver circuit, wherein the receiver circuit comprises; a receiver coil, wherein the receiver coil is capable of inductively coupling to a transmitter coil, wherein the receiver coil comprises an output port for outputting an input ac signal; a switch in series with the output port; load circuitry in parallel with the series combination of the output port and the switch, wherein the load circuitry is capable of coupling to a variable load, wherein the switch comprises; an input port, wherein the input port receives the input ac signal; an output port; a first transistor having a first source, a first drain, and a first gate, wherein the first source is coupled to the input port, wherein the first drain is coupled to the output port; a second transistor having a second source, a second drain, and a second gate, wherein the second source is coupled to the input port, wherein the second drain is coupled to the output port; a rectification network, wherein the rectification network receives the input ac signal, wherein the rectification network generates a maximum DC voltage that is approximately equal to a maximum input voltage of the input ac signal;
wherein the rectification network generates a minimum DC voltage that is approximately equal to a minimum input voltage of the input ac signal;a first control network, wherein the first control network comprises a first control port, wherein the first control port receives a first control signal, wherein the first control network receives the maximum DC voltage and the minimum DC voltage from the rectification network, wherein the first control network outputs a first transistor control signal to the first gate, wherein the first transistor control signal is the maximum DC voltage when the first control signal is in an on state, wherein the first transistor control signal is the minimum DC voltage when the first control signal is in an off state; a second control network, wherein the second control network comprises a second control port, wherein the second control port receives a second control signal, wherein the second control network receives the minimum DC voltage and the maximum DC voltage from the rectification network, wherein the second control network outputs a second transistor control signal to the second gate, wherein the second transistor control signal is the minimum DC voltage when the second control signal is in an on condition, wherein the second transistor control signal is the maximum DC voltage when the second control signal is in an off state, wherein when the maximum DC voltage is applied to the first gate, and the minimum DC voltage is applied to the second gate, the output port is connected to the input port, wherein when the minimum DC voltage is applied to the first gate, and the maximum DC voltage is applied to the second gate, the output port is disconnected from the input port. - View Dependent Claims (38, 39)
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37. A wireless power transfer system, comprising:
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a transmitter coil; driving circuitry, wherein the driving circuitry drives the transmitter coil to produce a time-varying magnetic field; a receiver circuit, wherein the receiver circuit comprises;
a receiver coil, wherein the receiver coil is capable of inductively coupling to a transmitter coil, wherein the receiver coil comprises an output port for outputting an input ac signal;a switch in parallel with the output port; load circuitry in parallel with the parallel combination of the output port and switch, wherein the load circuitry is capable of coupling to a variable load, wherein the switch comprises; an input port, wherein the input port receives the input ac signal; an output port; a first transistor having a first source, a first drain, and a first gate, wherein the first source is coupled to the input port, wherein the first drain is coupled to the output port; a second transistor having a second source, a second drain, and a second gate, wherein the second source is coupled to the input port, wherein the second drain is coupled to the output port; a rectification network, wherein the rectification network receives the input ac signal, wherein the rectification network generates a maximum DC voltage that is approximately equal to a maximum input voltage of the input ac signal;
wherein the rectification network generates a minimum DC voltage that is approximately equal to a minimum input voltage of the input ac signal;a first control network, wherein the first control network comprises a first control port, wherein the first control port receives a first control signal, wherein the first control network receives the maximum DC voltage and the minimum DC voltage from the rectification network, wherein the first control network outputs a first transistor control signal to the first gate, wherein the first transistor control signal is the maximum DC voltage when the first control signal is in an on state, wherein the first transistor control signal is the minimum DC voltage when the first control signal is in an off state; a second control network, wherein the second control network comprises a second control port, wherein the second control port receives a second control signal, wherein the second control network receives the minimum DC voltage and the maximum DC voltage from the rectification network, wherein the second control network outputs a second transistor control signal to the second gate, wherein the second transistor control signal is the minimum DC voltage when the second control signal is in an on condition, wherein the second transistor control signal is the maximum DC voltage when the second control signal is in an off state, wherein when the maximum DC voltage is applied to the first gate, and the minimum DC voltage is applied to the second gate, the output port is connected to the input port, wherein when the minimum DC voltage is applied to the first gate, and the maximum DC voltage is applied to the second gate, the output port is disconnected from the input port. - View Dependent Claims (40, 41)
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44. A method for switching an ac signal, comprising:
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providing an input port; inputting an input ac signal to the input port; providing an output port; providing a first transistor having a first source, a first drain, and a first gate, wherein the first source is coupled to the input port, wherein the first drain is coupled to the output port; providing a second transistor having a second source, a second drain, and a second gate, wherein the second source is coupled to the input port, wherein the second drain is coupled to the output port; providing a rectification network, wherein the rectification network receives the input ac signal, wherein the rectification network generates a maximum DC voltage that is approximately equal to a maximum input voltage of the input ac signal;
wherein the rectification network generates a minimum DC voltage that is approximately equal to a minimum input voltage of the input ac signal;providing a first control network, wherein the first control network comprises a first control port; providing a first control signal to the first control port, wherein the first control network receives the maximum DC voltage and the minimum DC voltage from the rectification network, wherein the first control network outputs a first transistor control signal to the first gate, wherein the first transistor control signal is the maximum DC voltage when the first control signal is in an on state, wherein the first transistor control signal is the minimum DC voltage when the first control signal is in an off state; providing a second control network, wherein the second control network comprises a second control port; providing a second control signal to the second control port, wherein the second control network receives the minimum DC voltage and the maximum DC voltage from the rectification network, wherein the second control network outputs a second transistor control signal to the second gate, wherein the second transistor control signal is the minimum DC voltage when the second control signal is in an on condition, wherein the second transistor control signal is the maximum DC voltage when the second control signal is in an off state, wherein when the maximum DC voltage is applied to the first gate, and the minimum DC voltage is applied to the second gate, the output port is connected to the input port, wherein when the minimum DC voltage is applied to the first gate, and the maximum DC voltage is applied to the second gate, the output port is disconnected from the input port.
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Specification