Control for electrically isolating power supply from external source with momentary switch and latching relay controlled by signal generated from power supply voltage
First Claim
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1. A system comprising:
- electrical components;
a power supply to provide power to the electrical components;
a momentary power switch to connect an external power source that is external to the system to the power supply, wherein the power switch has an on position, an off position, and a neutral position, and wherein the power switch if actuated to the off position causes the system to be electrically isolated from the external power source, wherein the power switch is to return to the neutral position after actuation to the on position;
a latching relay to maintain electrical connection between the external power source and the power supply in response to actuation of the power switch to the on position, wherein the latching relay is to maintain electrical connection between the external power source and the power supply even though the power switch has returned to the neutral position; and
a control circuit responsive to actuation of the power switch to the on position to provide a signal generated from a voltage provided by the power supply, the signal to cause machine-readable instructions to awaken the system from a system off state, and wherein the control circuit is to further provide the signal to the latching relay to actuate the latching relay to maintain the electrical connection.
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Abstract
A system includes a power supply and a power switch to connect an external power source that is external to the system to the power supply. The power switch has an on position and an off position. The power switch if actuated to the off position causes the system to be electrically isolated from the external power source. A control circuit is responsive to actuation of the power switch to provide a signal to cause software control of a power state of the system.
17 Citations
15 Claims
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1. A system comprising:
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electrical components; a power supply to provide power to the electrical components; a momentary power switch to connect an external power source that is external to the system to the power supply, wherein the power switch has an on position, an off position, and a neutral position, and wherein the power switch if actuated to the off position causes the system to be electrically isolated from the external power source, wherein the power switch is to return to the neutral position after actuation to the on position; a latching relay to maintain electrical connection between the external power source and the power supply in response to actuation of the power switch to the on position, wherein the latching relay is to maintain electrical connection between the external power source and the power supply even though the power switch has returned to the neutral position; and a control circuit responsive to actuation of the power switch to the on position to provide a signal generated from a voltage provided by the power supply, the signal to cause machine-readable instructions to awaken the system from a system off state, and wherein the control circuit is to further provide the signal to the latching relay to actuate the latching relay to maintain the electrical connection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of power control in a system, comprising:
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detecting, by a control circuit, actuation of a momentary power switch to an off position, the power switch having the off position, a neutral position, and an on position, and the power switch is to return to the neutral position after actuation to the on position or the off position; performing graceful shutdown of the system in response to actuation of the power switch to the off position; electrically isolating the system from an external power source after performing the graceful shutdown of the system; detecting actuation of the power switch to an on position; in response to detecting actuation of the power switch to the on position, connecting the external power source to a power supply in the system, wherein the power supply provides an output voltage in response to being connected to the external power source; generating, by a control circuit, an activation signal from the output voltage of the power supply, the activation signal to cause machine-readable instructions to transition the system to a system on state; and providing the activation signal to a latching relay to close the latching relay to maintain electrical connection between the external power source and the power supply, wherein the latching relay is to maintain electrical connection between the external power source and the power supply even though the power switch has returned to the neutral position from the on position. - View Dependent Claims (12)
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13. A power control apparatus for use in a system, comprising:
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a momentary power switch having an on position, an off position, and a neutral position, wherein the power switch is to return to the neutral position after actuation to the on position or the off position; a latching relay, wherein the latching relay is to be closed in response to actuation of the power switch to the on position to maintain electrical connection between an external power source and a power supply of the system, and the latching relay to maintain electrical connection between the external power source and the power supply even though the power switch has returned to the neutral position, wherein the latching relay is to be opened in response to actuation of the power switch to the off position to electrically isolate the external power source from the power supply; and a control circuit to; cause electrical connection between the external power source and the system in response to actuation of the power switch to the on position, cause electrical isolation between the external power source and the system in response to actuation of the power switch to the off position, assert a signal in response to actuation of the power switch to the on position, the signal generated from a voltage provided by the power supply and to cause machine-readable instructions to transition the system from a system off state to a system on state, wherein the control circuit is to further provide the signal to the latching relay to actuate the latching relay to maintain the electrical connection between the external power source and the power supply. - View Dependent Claims (14, 15)
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Specification