SAFETY DEVICE AND METHOD FOR ELECTRIC HEATING APPLIANCES
First Claim
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1. An over current protection circuit for an appliance, the circuit comprising:
- a plurality of contacts for sensing a plurality of corresponding load currents;
a full power timer configured and operatively connected to reduce a total current Iavg in the appliance on reaching a full power time limit T1; and
a clock enable circuit configured and operatively connected to operate the full power timer only while all of the contacts sense corresponding load currents.
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Abstract
An appliance includes a plurality of electrical loads and a load control circuit including at least a clock enable circuit and a full power timer. The clock enable circuit is configured and operatively connected to activate the full power timer when all of the loads are energized, and the full power timer is configured and operatively connected to de-energize at least one load selected from the plurality of loads on reaching a predetermined full power time limit.
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Citations
19 Claims
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1. An over current protection circuit for an appliance, the circuit comprising:
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a plurality of contacts for sensing a plurality of corresponding load currents; a full power timer configured and operatively connected to reduce a total current Iavg in the appliance on reaching a full power time limit T1; and a clock enable circuit configured and operatively connected to operate the full power timer only while all of the contacts sense corresponding load currents. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An appliance comprising:
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a plurality of electrical loads; and a load control circuit including at least a clock enable circuit and a full power timer, wherein the clock enable circuit is configured and operatively connected to activate the full power timer when all of the loads are energized, and the full power timer is configured and operatively connected to de-energize at least one load selected from the plurality of loads on reaching a predetermined full power time limit. - View Dependent Claims (12, 13, 14)
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15. A method for reducing current in an electrical appliance having a design current limit, a full power current characteristic of a full power condition, and a safety factor, comprising:
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setting a cycle time limit; setting a full power time limit based on at least the cycle time limit, the design current, the full power current, and the safety factor; sensing whether the appliance is in the full power condition; incrementing a full power time toward the full power time limit while the appliance is in the full power condition; and reducing the current in the appliance below the full power current when the full power time reaches the full power time limit. - View Dependent Claims (16, 17, 18, 19)
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Specification