Systems, devices, and methods for control of a power supply connection
First Claim
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1. A portable device, comprising:
- a control circuit transitionable from a disconnected state where a power supply is electrically disconnected from an electrical load, to a connected state where the power supply is electrically connected to the electrical load, the control circuit comprising;
an input node configured to receive a control signal;
a first transistor activatable to permit the supply of power from the power supply through the first transistor to the electrical load, and deactivatable to prevent the supply of power from the power supply to the electrical load,a second transistor coupled with the input node and configured to activate a fourth transistor in response to a first voltage of the control signal; and
a third transistor coupled with the input node and configured to control the activation of the first transistor in response to a second voltage of the control signal.
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Abstract
A power supply control circuit for a portable electronic device is capable of connecting and disconnecting a power supply with respect to an electrical load of the device. The power supply control circuit offers a relatively quick transition time and low leakage current, making the control circuit particularly suitable for applications that require the power supply to remain connected to the electrical load at all times.
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Citations
20 Claims
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1. A portable device, comprising:
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a control circuit transitionable from a disconnected state where a power supply is electrically disconnected from an electrical load, to a connected state where the power supply is electrically connected to the electrical load, the control circuit comprising; an input node configured to receive a control signal; a first transistor activatable to permit the supply of power from the power supply through the first transistor to the electrical load, and deactivatable to prevent the supply of power from the power supply to the electrical load, a second transistor coupled with the input node and configured to activate a fourth transistor in response to a first voltage of the control signal; and a third transistor coupled with the input node and configured to control the activation of the first transistor in response to a second voltage of the control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of connecting a power supply to an electrical load in a portable device having a first transistor electrically located between the power supply and the electrical load, a second transistor having a gate coupled to an input node, a third transistor having a gate coupled to the input node, and a fourth transistor, the method comprising:
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activating the third transistor with a first voltage applied at the input node; activating the first transistor with a second voltage applied by the third transistor, wherein activation of the first transistor electrically connects the power supply to the electrical load; deactivating the fourth transistor with the second voltage; and deactivating the second transistor, wherein the second transistor is electrically located between the power supply and the fourth transistor. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification