Method and apparatus of fast battery charging with universal high power input source
First Claim
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1. An electronic device, comprising:
- a universal serial bus (USB) connector for receiving a USB cable for connection to an associated high voltage adapter, the USB connector comprising a first conductive structure for electrical connection to a first data signal conductor of the USB cable, a second conductive structure for electrical connection to a second data signal conductor of the USB cable, a third conductive structure for electrical connection to a first power conductor of the USB cable, and a fourth conductive structure for electrical connection to a second power conductor of the USB cable;
a load operatively coupled to receive electrical power via the third and fourth conductive structures at a nominal voltage level or at least one of a plurality of high voltage levels above the nominal voltage level;
a transmit circuit coupled with the first and second conductive structures of the USB connector, the transmit circuit selectively operative in first and second transmitter states and comprising;
a current circuit selectively operative to conduct a non-zero predetermined current through a USB compliant impedance of the associated high voltage adapter to create a non-zero differential voltage across the first and second conductive structures, the current circuit comprising one of a current source selectively operative in the second transmitter state to source the non-zero predetermined current to one of the first and second conductive structures and a current sink selectively operative in the second transmitter state to sink the non-zero predetermined current from the one of the first and second conductive structures, anda voltage source selectively operative in the second transmitter state to provide a non-zero voltage to another one of the first and second conductive structures; and
a processor programmed to selectively place the transmit circuit in the first transmitter state to disable the transmit circuit to instruct the associated high voltage adapter to provide electrical power to the electronic device via the USB cable at the nominal voltage level or to selectively place the transmit circuit in the second transmitter state to instruct the associated high voltage adapter to provide electrical power to the electronic device via the USB cable at a first one of the high voltage levels.
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Abstract
Methods, electronic devices and USB charger apparatus are presented for fast USB charging, in which a high voltage master of the device detects a connected high voltage charger and selectively connects a current circuit to source or sink a current to or from one USB cable data signal conductor while providing a non-zero voltage to the other USB cable data signal conductor to configure the charger apparatus to provide charging power at a particular high voltage level above a nominal voltage level.
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Citations
20 Claims
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1. An electronic device, comprising:
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a universal serial bus (USB) connector for receiving a USB cable for connection to an associated high voltage adapter, the USB connector comprising a first conductive structure for electrical connection to a first data signal conductor of the USB cable, a second conductive structure for electrical connection to a second data signal conductor of the USB cable, a third conductive structure for electrical connection to a first power conductor of the USB cable, and a fourth conductive structure for electrical connection to a second power conductor of the USB cable; a load operatively coupled to receive electrical power via the third and fourth conductive structures at a nominal voltage level or at least one of a plurality of high voltage levels above the nominal voltage level; a transmit circuit coupled with the first and second conductive structures of the USB connector, the transmit circuit selectively operative in first and second transmitter states and comprising; a current circuit selectively operative to conduct a non-zero predetermined current through a USB compliant impedance of the associated high voltage adapter to create a non-zero differential voltage across the first and second conductive structures, the current circuit comprising one of a current source selectively operative in the second transmitter state to source the non-zero predetermined current to one of the first and second conductive structures and a current sink selectively operative in the second transmitter state to sink the non-zero predetermined current from the one of the first and second conductive structures, and a voltage source selectively operative in the second transmitter state to provide a non-zero voltage to another one of the first and second conductive structures; and a processor programmed to selectively place the transmit circuit in the first transmitter state to disable the transmit circuit to instruct the associated high voltage adapter to provide electrical power to the electronic device via the USB cable at the nominal voltage level or to selectively place the transmit circuit in the second transmitter state to instruct the associated high voltage adapter to provide electrical power to the electronic device via the USB cable at a first one of the high voltage levels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A Universal Serial Bus (USB) charger apparatus, comprising:
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a connector for receiving a USB cable, the connector comprising a first conductive structure for electrical connection to a first data signal conductor of the USB cable, a second conductive structure for electrical connection to a second data signal conductor of the USB cable, a third conductive structure for electrical connection to a first power conductor of the USB cable, and a fourth conductive structure for electrical connection to a second power conductor of the USB cable; a power supply coupled with the third and fourth conductive structures and selectively operative to supply electrical power to a connected electronic device via the third and fourth conductive structures at a nominal voltage level or at least one of a plurality of high voltage levels above the nominal voltage level at least partially according to at least one configuration signal; a USB compliant resistance coupled across the first and second conductive structures; a configuration circuit operatively coupled with the power supply to provide the at least one configuration signal at least partially according to at least one select signal; and a controller coupled with the first and second conductive structures, the controller comprising; a detector circuit operative to compare a voltage of at least one of the first and second conductive structures with a voltage reference and to provide a detector output signal in a first state when the voltage of the at least one of the first and second conductive structures exceeds the voltage reference, to provide the detector output signal in a different second state when the voltage of the at least one of the first and second conductive structures is less than or equal to the voltage reference, and to provide the detector output signal in the second state in the absence of the voltage of the at least one of the first and second conductive structures, and a select circuit operative to sense a polarity of a differential voltage across the first and second conductive structures, to selectively provide the at least one select signal to the configuration circuit according to the sensed polarity of the differential voltage when the detector output signal is in the first state and to provide the at least one select signal in a predetermined default state to cause the power supply to supply electrical power to the connected electronic device via the third and fourth conductive structures at the nominal voltage level when the detector output signal is in the second state. - View Dependent Claims (15, 16, 17, 18)
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19. A method for fast charging an electronic device via a Universal Serial Bus (USB) cable, the method comprising:
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detecting connection of a high voltage adapter to the electronic device via a USB cable using a USB compliant detection process; selectively sourcing or sinking a non-zero predetermined current to or from one of a first data signal conductor and a second data signal conductor of the USB cable while providing a non-zero voltage to another one of the first and second data signal conductors to configure the connected high voltage adapter to provide charging power to the electronic device via first and second power conductors of the USB cable at a particular high voltage level above a nominal voltage level; selectively adjusting provision of the charging power by the connected high voltage adapter to one of a second particular high voltage level and a default voltage level without repeating the USB compliant detection process; and automatically adjusting provision of the charging power by the high voltage adapter to the default voltage level without repeating the USB compliant detection process in response to disconnection of the high voltage adapter from the electronic device. - View Dependent Claims (20)
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Specification