Momentarily enabled electronic device
First Claim
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1. A method for supplying power to a device, comprising the operations of:
- detecting a button has been pressed;
detecting an output voltage from a power converter;
detecting the button has been released;
in response to detecting the button has been released and detecting the output voltage, supplying a base voltage to a base of a transistor, thereby creating a current path through the transistor and maintaining the output voltage of the power converter;
detecting a fault condition; and
in response to detecting the fault condition, ceasing to supply the base voltage, thereby terminating the output voltage of the power converter.
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Abstract
A method and apparatus for providing intermittent or interruptible power to an electronic device. The circuit may provide power upon user initiation and interrupt that power in response to a user command, fault state, period of inactivity and so forth. As one example, interruptible power may be initially provided to activate or “power up” an electronic device and constant power provided after the initial activation. The initial powering up of the device may be facilitated by closing two contacts. The circuit may continue to provide power after the button is released through a monitoring and/or feedback mechanism.
86 Citations
11 Claims
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1. A method for supplying power to a device, comprising the operations of:
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detecting a button has been pressed; detecting an output voltage from a power converter; detecting the button has been released; in response to detecting the button has been released and detecting the output voltage, supplying a base voltage to a base of a transistor, thereby creating a current path through the transistor and maintaining the output voltage of the power converter; detecting a fault condition; and in response to detecting the fault condition, ceasing to supply the base voltage, thereby terminating the output voltage of the power converter. - View Dependent Claims (2, 3)
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4. A method for supplying power to a device, comprising the operations of:
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detecting a button has been pressed by; while the button is pressed, supplying a voltage to a central node from a battery, the supplied voltage at or above a first predetermined voltage; and receiving a signal from a common node at a detection circuit that detects the first predetermined voltage on the common node detecting an output voltage from a power converter; detecting the button has been released; and in response to detecting the button has been released and detecting the output voltage, supplying a base voltage to a base of a transistor, thereby creating a current path through the transistor and maintaining the output voltage of the power converter. - View Dependent Claims (8, 9)
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5. A method for supplying power to a device, comprising the operations of:
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detecting a button has been pressed by detecting a first predetermined voltage on a common node in the device; detecting an output voltage from a power converter; detecting the button has been released by; detecting that the voltage on the common node is zero; and detecting a second predetermined voltage on a central node in the device; and in response to detecting the button has been released and detecting the output voltage, supplying a base voltage to a base of a transistor, thereby creating a current path through the transistor and maintaining the output voltage of the power converter. - View Dependent Claims (6, 7)
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10. An apparatus, comprising:
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a wireless keyboard; a button on the wireless keyboard; a power converter in the wireless keyboard that provides power for the wireless keyboard; a transistor in the wireless keyboard coupled to the power converter; a controller in the wireless keyboard that is coupled to the button and the power converter, wherein the controller is configured to; detect that the button has been pressed; detect an output voltage from a power converter; detect that the button has been released; and upon detecting that the button has been released and detecting the output voltage, supplying a base voltage to a base of the transistor, thereby creating a current path through the transistor and maintaining the output voltage of the power converter so that the wireless keyboard enters a powered-up state. - View Dependent Claims (11)
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Specification