# US 2014/0197735 A1 · Thermal control circuit for an active cooling module for a light-emitting diode fixture > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0197735 A1 - Document ID: US20140197735A1 - Status: Published application - Kind: A1 - Application number: 13/741,055 - Filed: 2013-01-14 - Published: 2014-07-17 - Earliest claimed: 2013-01-14 - Assignees: MP Design Inc. - Inventors: Alexander Kornitz; Mirek Pospisil - Web page: https://patentgrep.com/patent/US20140197735A1 ## CPC - F21V 29/00: Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems (lighting fixtures combined with outlets for air-treatment systems F24F13/078) - F21V 29/61: characterised by control arrangements - F21V 29/67: characterised by the arrangement of fans - F21Y 2105/10: comprising a two-dimensional [2D] array of point-like light-generating elements - F21Y 2115/10: Light-emitting diodes [LED] - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED ## Abstract A thermal control circuit comprises a positive temperature coefficient thermistor array, a negative temperature coefficient thermistor array, and a resistor array. The positive temperature coefficient thermistor array and the resistor array are electrically connected in parallel to a first terminal of the thermal control circuitry. The negative temperature coefficient thermistor array is electrically connected to a second terminal of the thermal control circuit. The positive temperature coefficient thermistor array, a negative temperature coefficient thermistor array, and the resistor array are all connected by a negative bus to a third terminal of the thermal control circuit. ## Claims ### Claim 1 A thermal control circuit comprising: a positive temperature coefficient thermistor array; a negative temperature coefficient thermistor array; and a resistor array, wherein the positive temperature coefficient thermistor array and the resistor array are electrically connected in parallel to a first terminal of the thermal control circuit; the negative temperature coefficient thermistor array is electrically connected to a second terminal of the thermal control circuit; and the positive temperature coefficient thermistor array, the negative temperature coefficient thermistor array and the resistor array are all connected by a negative bus to a third terminal of the thermal control circuit. ### Claim 2 (depends on 1) The thermal control circuit as claimed in claim 1 wherein the thermal control circuit is a package. ### Claim 3 An active cooling module for a light-emitting diode, the active cooling module comprising: a cooling device electrically connected to a power supply; and a thermal control circuit electrically connected to the power supply, the thermal control circuit including: a positive temperature coefficient thermistor array; a negative temperature coefficient thermistor array; and a resistor array, wherein the positive temperature coefficient thermistor array and the resistor array are electrically connected in parallel to a first terminal of the thermal control circuit; the negative temperature coefficient thermistor array is electrically connected to a second terminal of the thermal control circuit; and the positive temperature coefficient thermistor array, the negative temperature coefficient thermistor array and the resistor array are all connected by a negative bus to a third terminal of the thermal control circuit; wherein a negative terminal of the light-emitting diode is electrically connected the first terminal of the thermal control circuit, a negative terminal of the cooling device is electrically connected to the second terminal of the thermal control circuit, and a negative terminal of the power supply is electrically connected to the third terminal of the thermal control circuit. ### Claim 4 (depends on 3) The active cooling module as claimed in claim 3 further including a heat sink and wherein the light-emitting diode is thermally coupled to the heat sink. ### Claim 5 (depends on 4) The active cooling module as claimed in claim 4 wherein the thermal control circuit is mounted on the heat sink. ### Claim 6 (depends on 3) The active cooling module as claimed in claim 3 wherein the thermal control circuit is a package. ### Claim 7 (depends on 3) The active cooling module as claimed in claim 3 wherein the cooling device is a fan. ### Claim 8 (depends on 3) The active cooling module as claimed in claim 3 wherein the light-emitting diode is part of an LED array. ### Claim 9 An electronic device provided with an active cooling module, the electrical device comprising: a power supply; a light-emitting diode electrically connected to the power supply; a cooling device electrically connected to the power supply; and a thermal control circuit electrically connected to the power supply, the thermal control circuit including: a positive temperature coefficient thermistor array; a negative temperature coefficient thermistor array; and a resistor array, wherein the positive temperature coefficient thermistor array and the resistor array are electrically connected in parallel to a first terminal of the thermal control circuit; the negative temperature coefficient thermistor array is electrically connected to a second terminal of the thermal control circuit; and the positive temperature coefficient thermistor array, the negative temperature coefficient thermistor array and the resistor array are all connected by a negative bus to a third terminal of the thermal control circuit; wherein a negative terminal of the light-emitting diode is electrically connected the first terminal of the thermal control circuit, a negative terminal of the cooling device is electrically connected to the second terminal of the thermal control circuit, and a negative terminal of the power supply is electrically connected to the third terminal of the thermal control circuit. ### Claim 10 (depends on 9) The electronic device as claimed in claim 9 further including a printed circuit board wherein the light-emitting diode and the thermal control circuit are mounted on the printed circuit board. ### Claim 11 (depends on 9) The electronic device as claimed in claim 9 further including a heat sink and wherein the light-emitting diode is thermally coupled to the heat sink ### Claim 12 (depends on 11) The electronic device as claimed in claim 11 wherein the thermal control circuit is mounted on the heat sink. ### Claim 13 (depends on 9) The electronic device as claimed in claim 9 wherein the thermal control circuit is a package. ### Claim 14 (depends on 9) The electronic device as claimed in claim 9 wherein the cooling device is a fan. ### Claim 15 (depends on 9) The electronic device as claimed in claim 9 wherein the light-emitting diode is part of an LED array. ### Claim 16 (depends on 9) The electronic device as claimed in claim 9 wherein the electronic device is a light-emitting diode fixture.