Techniques to Route Power to a USB Host in Dead Battery Condition
First Claim
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1. An apparatus comprising:
- a USB-PD capable port at a USB host arranged to route power to or from a USB device coupled to the USB host through the USB-PD capable port;
a first switch having a single pole, single toggle switch configuration capable of routing a first voltage level from the USB host to the USB device while the first switch is in a closed position;
a second switch having the single pole, single toggle switch configuration capable of routing a second voltage level from the USB host to the USB device while the second switch is in a closed position;
a third switch having a double pole, single toggle switch configuration capable of routing the second voltage level to provide operating power to circuitry at the USB host, a first closed position of the third switch to route the second voltage level from a first power source at the USB device, a second closed position of the third switch to route the second voltage level from a second power source located at or coupled with the USB host; and
a fourth switch having the single pole, single toggle switch configuration that is capable of switching to a closed position if the second voltage level is within a range of voltage levels and the third switch is the first closed position.
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Abstract
Examples may include routing power between a Universal Serial Bus (USB) host and a USB device. In some examples, the power may be routed from a power source at the USB device while the USB host is in a dead battery condition. Various switches at the USB host may be capable of selectively switching to route power from the power source to provide operating power to circuitry at the USB host.
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Citations
25 Claims
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1. An apparatus comprising:
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a USB-PD capable port at a USB host arranged to route power to or from a USB device coupled to the USB host through the USB-PD capable port; a first switch having a single pole, single toggle switch configuration capable of routing a first voltage level from the USB host to the USB device while the first switch is in a closed position; a second switch having the single pole, single toggle switch configuration capable of routing a second voltage level from the USB host to the USB device while the second switch is in a closed position; a third switch having a double pole, single toggle switch configuration capable of routing the second voltage level to provide operating power to circuitry at the USB host, a first closed position of the third switch to route the second voltage level from a first power source at the USB device, a second closed position of the third switch to route the second voltage level from a second power source located at or coupled with the USB host; and a fourth switch having the single pole, single toggle switch configuration that is capable of switching to a closed position if the second voltage level is within a range of voltage levels and the third switch is the first closed position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method implemented at a universal serial bus (USB) host comprising:
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receiving, at a first switch, a first signal from a voltage regulator indicating whether power at a first voltage level is being received by the voltage regulator from a first power source located at or coupled to the USB host; selecting a first closed position of the first switch based on the first signal indicating that power at the first voltage level is not being received by the voltage regulator; receiving, at a second switch, power at a second voltage level from a second power source located at a USB device coupled to the USB host through a USB power delivery (USB-PD) capable port at the USB host; closing the second switch based on the power at the second voltage level falling within a range of voltage levels; and routing the power at the second voltage level from the second power source through the closed second switch to provide operating power to circuitry at the USB host. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus comprising:
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a processor circuit for a controller at a universal serial bus (USB) host arranged to route power to or from a USB device coupled to the USB host through a USB power delivery (USB-PD) capable port; a high voltage component for execution by the processor circuit to control a first switch having a single pole, single toggle switch configuration that is capable of routing a first voltage level from a first power source located at or coupled with the USB host to the USB device while the first switch is in a closed position; and a low voltage component for execution by the processor circuit to control a second switch having the single pole, single toggle switch configuration that is capable of routing a second voltage level from the USB host to the USB device while the second switch is in a closed position, the low voltage component capable of maintaining the second switch in an open position during a dead battery condition that includes a second power source at the USB device providing operating power at the second voltage level to circuitry at the USB host through third and fourth switches. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification