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US 11,456,598 B1Granted
Two wire power delivery system for mobile devices with passive orientation detection
AssigneeMicrosoft Technology Licensing, LLC
InventorsJulian Arlo Binder, Brandon Baxter Harris
Life of this patent
Estimating the term…
Abstract
Technologies are described herein for a two-wire power delivery system that may be employed by a mobile device with a reversable cable. The described techniques allow for the two-wire power cable to be inserted in any orientation into the mobile device, without requiring a special keying or registration element, and without requiring any additional pins or wires. The mobile device includes a passive protection circuit that assists the two-wire power cable system in detecting the correct orientation for power delivery.
Claims20
A two-wire power delivery system comprising:
- a passive protection circuit in a mobile device with a two-wire power interface that includes two power pins;
- a control circuit, external from the mobile device, wherein the control circuit is powered by a high-side power supply (VH) and a low-side power supply (VL), and wherein the control circuit is configured to detect a voltage at a detect pin and generate one or more control signals;
- and
- a switch circuit, external from the mobile device, that is configured to selectively control connections between the two power pins (PIN1, PIN2) of the mobile device and one or more of the high-side power supply (VH), the low-side power supply (VL), and the voltage detect pin of the control circuit, such that:
- in an idle state, the switch circuit is configured to decouple the two power pins (PIN2, PIN2) from external power;
- in a test state, one of the two power pins (PIN1, PIN2) of the mobile device is coupled to one of the high-side power supply and the low-side power supply by the switch circuit, and the other of the two power (PIN1, PIN2) is coupled through a series resistor to the other of the high-side power supply and the low-side power supply which corresponds to the detect pin of the control circuit, wherein the control circuit determines an orientation of the two power pins based on a detected voltage at the detect pin;
- and
- in a connect state, one of the two power pins is coupled to one of the high-side power supply and the low-side power supply by the switch circuit, and the other of the two power pins is coupled to the other of the high-side power supply and the low-side power supply by the switch circuit based on the determined orientation.
5 more elements
A two-wire power delivery system comprising:
- a passive protection circuit in a mobile device with a two-wire power interface that includes a first power pin and a second power, wherein the passive protection circuit is configured to couple the first power pin to the positive battery terminal (V+) when a voltage applied across the first power pin and the second power has a positive polarity, and configured to decouple the first power pin from the positive battery terminal (V+) when the voltage applied across the first power pin and the second power has a negative polarity;
- a control circuit, external from the mobile device, wherein the control circuit is powered by a high-side power supply (VH) and a low-side power supply (VL), and wherein the control circuit is selectively configured to detect a voltage at one of the first power pin and the second power pin, and wherein the control circuit is configured to generate control signals based on an operating phase of the system;
- and
- a switch circuit, external from the mobile device, that is configured by the control signals to:
- responsive to a first of the control signals, couple the high-side power supply (VH) to the first power pin;
- responsive to a second of the control signals, couple the low-side power supply (VL) to the first power pin;
- responsive to a third of the control signals, couple the low-side power supply (VL) to the first power pin via a first pulldown resistor;
- responsive to a fourth of the control signals, couple the high-side power supply (VH) to the second power pin;
- responsive to a fifth of the control signals, couple the low-side power supply (VL) to the second power pin;
- and
- responsive to a sixth of the control signals, couple the low-side power supply (VL) to the second power pin via a second pulldown resistor.
8 more elements
A two-wire power delivery system comprising:
- a passive protection circuit in a mobile device with a two-wire power interface that includes a first power pin and a second power, wherein the passive protection circuit is configured to couple the second power pin to the negative battery terminal (V−) when a voltage applied across the first power pin and the second power has a positive polarity, and configured to decouple the second power pin from the negative battery terminal (V−) when the voltage applied across the first power pin and the second power has a negative polarity;
- a control circuit, external from the mobile device, wherein the control circuit is powered by a high-side power supply (VH) and a low-side power supply (VL), and wherein the control circuit is selectively configured to detect a voltage at one of the first power pin and the second power pin, and wherein the control circuit is configured to generate control signals based on an operating phase of the system;
- and
- a switch circuit, external from the mobile device, that is configured by the control signals to:
- responsive to a first of the control signals, couple the high-side power supply (VH) to the first power pin;
- responsive to a second of the control signals, couple the low-side power supply (VL) to the first power pin;
- responsive to a third of the control signals, couple the high-side power supply (VH) to the first power pin via a first pullup resistor;
- responsive to a fourth of the control signals, couple the high-side power supply (VH) to the second power pin;
- responsive to a fifth of the control signals, couple the low-side power supply (VL) to the second power pin;
- and
- responsive to a sixth of the control signals, couple the high-side power supply (VH) to the second power pin via a second pullup resistor.
8 more elements
Dependencies are inferred from the claim text.