Importance

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Abstract

A circuit (10) comprising a latching device (20) operatively arranged to change from a first output state to a second output state as a function of a magnetic field (40) applied in a first direction, to maintain the second output state when the magnetic field is either no longer applied in the first direction or applied again in the first direction, and to change from the second output state to the first output state as a function of a magnetic field applied in a second direction, a power switching device (30) coupled to a power source (15), a load (35) and the latching device and operatively arranged such that the power switching device connects the power source and the load when the latching device is in the second state and disconnects the power source and the load when the latching device is in the first state, a magnetic switching device (25) coupled between the latching device and the power source and having an open default disconnected state and operatively arranged to change from the open default state to a closed connected state when the magnetic field is applied in the first direction and to return to the open default state when the magnetic field is removed, the latching device and magnetic switching device arranged such that the magnetic field applied in the first direction causes the magnetic switching device to change from the open default state to the closed connected state, thereby powering the latching device, and the latching device to change from the first state to the second state, thereby signaling the power switching device to connect the power source and the load.

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First Claim