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Three-temperature-zone constant-power LED (light-emitting diode) driving integrated circuit

A LED drive and integrated circuit technology, applied in the field of drive integrated circuits and three-temperature zone linear constant power LED drive integrated circuits, can solve the problems of increased output power and difficulty in ensuring that the LED drive circuit works in a constant power state, and achieves guaranteed reliability effect

Active Publication Date: 2017-09-12
无锡市永晶光电科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, the linear constant current LED drive circuit usually increases the output power when the input voltage increases, it is difficult to ensure that the LED drive circuit works in a constant power state

Method used

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0018] Such as figure 1 Shown: In order to set three temperature working curves according to the different temperatures of the LED lamp beads, that is, the output power is basically unchanged before the low temperature reaches the temperature at which the LED lamp beads do not experience light decay; Above, the power is reduced; before the LED lamp bead or the driving circuit reaches the limit junction temperature and is damaged, the present invention includes a constant current driving circuit for driving the LED lamp bead; Temperature drift voltage reference circuit, negative temperature drift voltage reference circuit at high temperature and junction temperature protection circuit; when the LED lamp bead is working at low temperature, the near zero temperature drift voltage reference circuit can provide a near zero temperature drift reference voltage, and th...

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Abstract

The invention relates to a three-temperature-zone constant-power LED (light-emitting diode) driving integrated circuit. A constant-current driving circuit adjusts power for driving an LED bead according to a current, a near-zero-temperature-excursion reference voltage and a negative-temperature reference voltage when the LED bead works, so that the power applied by the constant-current driving circuit onto the LED bead is adaptive to the working temperature of the LED bead; and when the working temperature of the LED bead is close to a limit junction temperature of the LED bead, a junction temperature protection circuit switches off the driving of the constant-current driving circuit for the LED bead. When the temperature is lowered to the temperature that the LED bead does not have the light attenuation, the output power is basically unchanged; in the light attenuation temperature range of the LED bead, the LED bead works in a power reduction manner; and the LED bead or the driving circuit is switched off when the temperature reaches the limit junction temperature, so that the reliability at the high voltage or high-voltage instantaneous impact can be ensured.

Description

technical field [0001] The invention relates to a driving integrated circuit, in particular to a linear constant power LED driving integrated circuit with three temperature zones, belonging to the technical field of LED driving circuits. Background technique [0002] At present, in the prior art, in order to solve the burning problem of LED lamp beads under high temperature, the scheme of linear constant current lighting power supply is often adopted. At high temperature, such as 115°C, the circuit performs temperature protection, and the driving current is rapidly attenuated or turned off at this time. But in fact, when the temperature of the LED lamp bead rises above 80°C, it has already begun to affect the light decay of the lamp bead. Therefore, the ideal lamp bead drive circuit should have the same driving power at low temperature or room temperature, but at a high temperature such as 80°C Start slow power decay to reduce the operating temperature, and when the temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/395H05B45/50Y02B20/30
Inventor 王开
Owner 无锡市永晶光电科技有限公司
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