Heating Pad With Temperature Control And Safety Protection Device
First Claim
1. In a heating pad having a heating element, the improvement comprising:
- a control circuit operatively connected to the heating element for providing a predetermined level of power thereto; and
an isolation device operatively connecting the control circuit to a power source;
wherein;
the control circuit terminates power to the heating element in response to the heating element exceeding a first temperature limit; and
the isolation device isolating the control circuit from the power source in response to the heating element exceeding a second temperature limit.
1 Assignment
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Accused Products
Abstract
A heating pad is provided. The heating pad includes a heating element and a control circuit operatively connected to the heating element for providing a predetermined level of power thereto. An isolation device interconnects a power source to the control circuit. The isolation device has a first open configuration preventing transmission of electrical power therethrough and a second closed configuration allowing transmission of electrical power therethrough. The control circuit terminates power to the heating element in response to the heating element exceeding a first temperature limit. The isolation device moves from the closed configuration to the open configuration in response to the heating element exceeding a second temperature limit.
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Citations
21 Claims
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1. In a heating pad having a heating element, the improvement comprising:
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a control circuit operatively connected to the heating element for providing a predetermined level of power thereto; and an isolation device operatively connecting the control circuit to a power source; wherein; the control circuit terminates power to the heating element in response to the heating element exceeding a first temperature limit; and the isolation device isolating the control circuit from the power source in response to the heating element exceeding a second temperature limit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A heating pad, comprising:
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a heating element; a control circuit operatively connected to the heating element for providing a predetermined level of power thereto; and an isolation device interconnecting a power source to the control circuit, the isolation device having a first open configuration preventing transmission of electrical power therethrough and a second closed configuration allowing transmission of electrical power therethrough; and wherein; the control circuit terminates power to the heating element in response to the heating element exceeding a first temperature limit; and the isolation device moves from the closed configuration to the open configuration in response to the heating element exceeding a second temperature limit. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A heating pad, comprising:
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a heating conductor; a negative temperature coefficient layer surrounding the heating conductor; a positive temperature coefficient sensor conductor having a resistance and extending about the negative temperature coefficient layer; a control circuit operatively connected to the heating conductor for supplying power thereto; an isolation device interconnecting the control circuit to a power source, the isolation device having a first open configuration preventing transmission of electrical power therethrough and a second closed configuration allowing transmission of electrical power therethrough; and wherein; the control circuit terminates power to the heating conductor in response to the resistance of the positive temperature coefficient sensor conductor exceeding a first threshold; and the isolation device moves from the closed configuration to the open configuration in response to the shorting of the positive temperature coefficient sensor conductor to the heating conductor. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification