Current sensing circuit disconnect device and method
First Claim
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1. A charging device, comprising:
- a transformer including a primary-side circuit and a secondary-side circuit;
the primary-side circuit including a first switch having an open state that opens said primary-side circuit to current flow and a closed state that permits current flow through said primary-side circuit;
the secondary-side circuit including a connector for connection to a load for charging an energy storage device in said load;
a second switch in said secondary-side circuit for switching the first switch to its open state when the current drawn by said load is below a preset threshold.
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Abstract
A device and method are provided for saving power and electricity in a charging device including external power supplies and battery chargers having a primary circuit and a secondary circuit where a switch is located in the primary circuit and a current sensing device in the secondary circuit to sense when there is a drop in current in the secondary circuit or no current in the secondary circuit because the load such as a cell phone or tablet is charged and when this occurs the switch in the primary circuit is opened and the primary circuit no longer draws power from the source of power until the switch in the primary circuit is closed by activation of a user of the charging device.
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Citations
14 Claims
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1. A charging device, comprising:
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a transformer including a primary-side circuit and a secondary-side circuit; the primary-side circuit including a first switch having an open state that opens said primary-side circuit to current flow and a closed state that permits current flow through said primary-side circuit; the secondary-side circuit including a connector for connection to a load for charging an energy storage device in said load; a second switch in said secondary-side circuit for switching the first switch to its open state when the current drawn by said load is below a preset threshold. - View Dependent Claims (3, 4, 5, 6)
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2. An adapter for a charging device having a transformer including a primary-side circuit and a secondary-side circuit, comprising:
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a first adapter portion for extending the primary-side circuit of said charging device including a first switch having an open state that opens said extended primary-side circuit to current flow and a closed state that permits current flow through said extended primary-side circuit; a second adapter portion for extending the secondary-side circuit of said charging device including a connector for connection to a load for charging an energy storage device in said load; a second switch in said extended secondary-side circuit for switching the first switch to its open state when the current drawn by said load is below a preset threshold.
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7. A method for disconnecting a charging device including a transformer, comprising:
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providing a first switch in the primary-side circuit of the primary coil of the transformer; providing a second switch in the secondary-side circuit of the transformer; and the second switch switching the first switch to its open state when a current drawn by a load connected to the secondary-side circuit is below a preset threshold. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification