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A dual-function led drive circuit

A LED drive, dual-function technology, applied in the field of drive circuits, dual-function LED drive circuits, can solve the unfavorable vehicle appearance requirements, single, geometric space and other problems, to achieve less number of LED light sources, to ensure uniformity and stability The effect of guaranteeing the stability and luminous uniformity

Active Publication Date: 2015-09-09
DONGFENG PEUGEOT CITROEN AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using PWM to control LEDs, usually only a single LED light source is used to achieve a single function. For car lights that need to realize multiple functions, multiple LED light sources are needed, and the more LED light sources on the car body, the more space it occupies. The more geometric space, it is not conducive to the beautiful appearance of the vehicle

Method used

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  • A dual-function led drive circuit
  • A dual-function led drive circuit
  • A dual-function led drive circuit

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not limit the present invention.

[0021] Such as figure 1 As shown, the present invention includes a protection circuit module 1 , a power supply module 2 , a PWM signal generation module 3 , a current regulation module 4 , a fault diagnosis module 5 and an LED lamp 6 .

[0022] protection circuit modules such as figure 2 As shown, its circuit composition includes: capacitors C1, C2, and C3, resistors R1, R2, and regulator tubes D1, D2, where capacitor C1 is connected in parallel with resistor R1 and connected in series with regulator tube D1, and capacitor C2 is connected in parallel with resistor R2. It is connected in series with the voltage regulator tube D2, and the cathodes of the voltage regulator tube D1 and the voltage regulator tube D2 are connected to...

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Abstract

The invention belongs to the technical field of automobile lamps, and particularly relates to a dual-function LED drive circuit. The dual-function LED drive circuit comprises a protective circuit module, a power supply module, a PWM signal generating module, a current adjusting module, a fault diagnosis module and an LED lamp. The protective circuit module, the power supply module, the PWM signal generating module and the current adjusting module are electrically connected in sequence. The output end of the protective circuit module and the output end of the current adjusting module are connected with the anode and the cathode of the LED lamp respectively, the input end of the fault diagnosis module is connected with the cathode of the LED lamp, and the output end of the fault diagnosis module is connected with the PWM signal generating module. The LED drive circuit is controlled by PWM, a constant flow source is adopted to control a field effect transistor in the LED drive circuit to enable the current flowing through the LED lamp to be constant, the uniformity and stability of LED brightness are ensured, two kinds of light with different kinds of brightness can be emitted by a series of LED lamps through the drive circuit, the number of the LED light sources on an automobile body is effectively reduced, and the space utilization rate of the automobile body is improved.

Description

technical field [0001] The invention belongs to the technical field of automobile lamps, and specifically relates to a dual-function LED drive circuit, especially a drive circuit that realizes dual functions through a single LED light source and can ensure the uniformity of light emission of multiple LEDs and low heat resistance risk. Background technique [0002] In the current LED car light signal lighting circuit design, when multiple LEDs are used to realize a certain car light function, the requirements for the consistency of LED brightness and light color and other parameters are relatively high. The traditional LED drive circuit usually uses a single light source to achieve a single function, and its brightness control is usually realized by a resistive structure or through digital dimming or analog dimming. For the method of controlling brightness with resistive structure, when the current of the input power supply fluctuates, the brightness of the LED will change, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 李祥兵王春才
Owner DONGFENG PEUGEOT CITROEN AUTOMOBILE
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