Temperature adaptive control circuit for a light emitting diode, lighting and/or signaling apparatus
US9854635B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2016 |
| Grant date | Dec 26, 2017 |
| Priority date | — |
| Expiry date | Dec 5, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An embodiment of the present application provides a temperature adaptive control circuit for a light emitting diode and a lighting and/or signaling apparatus. The control circuit includes: a light emitting diode load circuit unit in which one or more light emitting diodes are connected; and a temperature adaptive circuit unit comprising a positive temperature coefficient thermistor and a negative temperature coefficient thermistor connected in series, wherein the temperature adaptive circuit unit is configured such that current flowing through the one or more light emitting diodes in the light emitting diode load circuit unit is a function of sum of resistance of the positive temperature coefficient thermistor and resistance of the negative temperature coefficient thermistor. It not only can compensate the variation of the luminescent intensity with the temperature in a desired working temperature for the LEDs, but also can achieve overheating protection for the LEDs to avoid damage thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.