Personal consumer product with thermal control circuitry and methods thereof
A personal consumer product having an energy emitting element in selective electrical communication with a power source is provided. Thermal control circuitry is used to isolate the energy emitting element from the power source when a temperature of the energy emitting element exceeds a threshold. The thermal control circuitry includes a primary thermal control circuit and a redundant thermal control circuit. Methods for controlling the temperature of an energy emitting element of a personal consumer product are also provided.
1. A method for controlling the temperature of an energy emitting element of a personal consumer device, the method comprising:
supplying power to the energy emitting element from a power source, wherein a first thermal sensor is positioned proximate to the energy emitting element to sense the temperature of the energy emitting element and generate a first thermal sensor output and a second thermal sensor is positioned proximate to the energy emitting element to sense the temperature of the energy emitting element and generate a second thermal sensor output;
receiving the first thermal sensor output at a first control unit, wherein the first thermal sensor output corresponds to the temperature of the energy emitting element sensed by the first thermal sensor;
when the temperature of the energy emitting element sensed by the first thermal sensor exceeds a first thermal threshold, electrically isolating the energy emitting element from the power source;
receiving the second thermal sensor output at a second control unit, wherein the second thermal sensor output corresponds to the temperature of the energy emitting element sensed by the second thermal sensor; and
when the temperature of the energy emitting element sensed by the second thermal sensor exceeds a second thermal threshold, electrically isolating the energy emitting element from the power source, wherein a third thermal sensor is positioned proximate to the energy emitting element to sense the temperature of the energy emitting element and generate a third thermal sensor output and a fourth thermal sensor is positioned proximate to the energy emitting element to sense the temperature of the energy emitting element and generate a fourth thermal sensor output, the method further comprising:
receiving the third thermal sensor output at the second control unit, wherein the third thermal sensor output corresponds to the temperature of the energy emitting element sensed by the third thermal sensor;
when the temperature of the energy emitting element sensed by the third thermal sensor exceeds a third thermal threshold, switching the second switching element to a non-conductive state to electrically isolate the energy emitting element from the power source;
receiving the fourth thermal sensor output at a first control unit, wherein the fourth thermal sensor output corresponds to the temperature of the energy emitting element sensed by the fourth thermal sensor; and
when the temperature of the energy emitting element sensed by the fourth thermal sensor exceeds a fourth threshold, switching the first switching element to a non-conductive state to electrically isolate the energy emitting element from the power source.
2. The method of claim 1 , wherein supplying power to the energy emitting element from the power source comprises:
supplying power through a first switching element in a conductive state and a second switching element in a conductive state, wherein the first switching element and the second switching element are connected in series with the energy emitting element.
3. The method of claim 2 , wherein electrically isolating the energy emitting element from the power source when the temperature of the energy emitting element sensed by the first thermal sensor exceeds the first thermal threshold comprises:
switching the first switching element to a non-conductive state by the first control unit.
4. The method of claim 3 , wherein electrically isolating the energy emitting element from the power source when the temperature of the energy emitting element sensed by the second thermal sensor exceeds the second thermal threshold comprises:
switching the second switching element to a non-conductive state by the second control unit.
5. The method of claim 4 , wherein the second thermal threshold and the third thermal threshold are substantially equal and the first thermal threshold and the fourth thermal threshold are substantially equal.
6. The method of claim 5 , wherein the second thermal threshold and the third thermal threshold are each higher than each of the first thermal threshold and the fourth thermal threshold.
7. The method of claim 1 , wherein the first control unit is a microcontroller and the second control unit is any of a voltage comparator and a monostable multivibrator.