Power supply voltage and load consumption control
First Claim
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1. An electronic circuit, comprising:
- a power circuit comprising;
first and second resistors,a switch to selectively connect the first and second resistors to a signal node,a voltage controller to, responsive to the switch being set to a first state to connect the first resistor to the signal node and disconnect the second resistor from the signal node, detect a voltage at the signal node and to provide a corresponding voltage control signal, anda voltage regulator to provide a supply voltage to a power node in accordance with the voltage control signal; and
a load circuit to be removably coupled to the signal node and the power node, the load circuit comprising;
a programming resistor coupled between the signal node and a ground node, anda load controller to, responsive to the switch being set to a second state to connect the second resistor to the signal node and disconnect the first resistor from the signal node, sense a voltage at the signal node and to provide a corresponding load control signal.
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Abstract
Examples of electronic circuits and methods are provided. A power adapter is coupled to load device such that a power node and a signal node and a ground node are common to both entities. A supply voltage is regulated and provided by the power adapter to the load device in accordance with a voltage sensed at the signal node. Electrical current drawn by the load device is limited in accordance with a voltage sensed at the signal node.
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Citations
18 Claims
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1. An electronic circuit, comprising:
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a power circuit comprising; first and second resistors, a switch to selectively connect the first and second resistors to a signal node, a voltage controller to, responsive to the switch being set to a first state to connect the first resistor to the signal node and disconnect the second resistor from the signal node, detect a voltage at the signal node and to provide a corresponding voltage control signal, and a voltage regulator to provide a supply voltage to a power node in accordance with the voltage control signal; and a load circuit to be removably coupled to the signal node and the power node, the load circuit comprising; a programming resistor coupled between the signal node and a ground node, and a load controller to, responsive to the switch being set to a second state to connect the second resistor to the signal node and disconnect the first resistor from the signal node, sense a voltage at the signal node and to provide a corresponding load control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power adapter, comprising:
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a power node, a signal node, and a ground node each to be disconnectably coupled to a computing device that is separate from the power adapter; a first resistor between the power node and the signal node; and a voltage controller to detect a voltage at the signal node and to provide a corresponding voltage control signal to control a supply voltage at the power node, wherein the detected voltage at the signal node is based on a resistance of the first resistor and a resistance of a second resistor that is part of the computing device and external of the power adapter. - View Dependent Claims (11, 12, 13, 14)
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15. A method comprising:
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providing first and second resistors within an adapter; connecting a switch to the first and second resistors, the switch selectively set to a first state to connect the first resistor to a signal node in the adapter and disconnect the second resistor from the signal node, and to a second state to connect the second resistor to the signal node and disconnect the first resistor from the signal node; connecting a voltage controller to the signal node, the voltage controller to detect a voltage at the signal node responsive to the switch set to the first state, and the voltage controller to output a voltage control signal responsive to the detected voltage at the signal node; and providing a regulator to output a regulated voltage from the adapter to a load entity in accordance with the voltage control signal. - View Dependent Claims (16, 17, 18)
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Specification