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A car reading light led driver chip

A technology for LED driving and car reading lights, applied in lighting devices, light sources, electrical components, etc., can solve the problem of brightness flickering of incandescent lamps, and achieve the effects of improving resistance to temperature changes, saving power, and high LED efficiency

Active Publication Date: 2017-10-20
SI EN TECHNOLOGY (XIAMEN) LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The jitter of the battery voltage will cause the voltage difference between the two ends of the incandescent lamp to jitter, causing the brightness of the incandescent lamp to flicker

Method used

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  • A car reading light led driver chip
  • A car reading light led driver chip
  • A car reading light led driver chip

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0038] Please refer to figure 2 and image 3As shown, it has shown the concrete structure of the preferred embodiment of the present invention, is a kind of car reading light LED driver chip, and this LED driver chip has 8 pins and peripheral circuit, and 8 pins are shown in table 1 respectively Show:

[0039] pin

definition

pin

definition

1

EN

5

GND

2

ISET

6

out

3

TSTE_UP

7

VCC

4

TSET_DN

8

PWM

[0040] Table 1

[0041] Among them, the connection relationship between the 8 pins and the peripheral circuit is as follows: the VCC pin is connected to the power supply V Battery , power supply V Battery Connected with a Zener diode, the diode is connected in parallel with a 10µF capacitor to form a voltage stabilizer circuit, which acts as a protection, so that the moment the diode is turned on, it will not be impacted by high current and high voltage. The role of the Zener tube is to ...

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PUM

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Abstract

The invention discloses an LED drive chip for a car reading light. The car reading light uses an LED instead of an incandescent lamp, and the efficiency of the LED is higher than that of an incandescent bulb, thereby saving electric energy. Fade on and off control logic circuit module and current source module; first, use the idea of ​​state machine to control the output of current source, which is superior to the general digital system control method, and can realize more complex functions to meet the needs of practical applications; second , the LED fading and fading functions provided by the current fading control logic circuit module can change the brightness of the LED linearly, which makes people feel better; third, the current source module provides current, temperature and battery for the LED. When the voltage changes, the LED current can be almost constant, which greatly improves the ability of the LED brightness to resist temperature changes and power voltage changes.

Description

technical field [0001] The invention relates to the technology in the LED field, in particular to an LED driver chip for an automobile reading light. Background technique [0002] Due to its advantages of energy saving and high efficiency, LEDs are more and more widely used in automotive lighting systems. But at present, the reading lamps in the front row and the rear row in the middle and low-grade car compartment generally still use tungsten wire as the incandescent bulb of the electric light source. [0003] A typical prior art solution for reading lights in the car compartment using incandescent bulbs is as follows: figure 1 shown. Powered by a 12-volt power supply, the incandescent lamp is equivalent to a resistor, and a three-position switch contains three connection methods. When the three-position switch is connected to the left, the incandescent lamp is always on, and the current of the incandescent lamp is determined by dividing the battery voltage by the equiva...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/10
Inventor 赵东世雷亚龙
Owner SI EN TECHNOLOGY (XIAMEN) LIMITED