Low-cost constant-current charging LED driving circuit

A technology of LED driving and constant current charging, which is applied in the field of LED driving, can solve the problems of low-cost LED constant current driving, etc., and achieve the effects of high cost performance, stable brightness, and port resource saving

Inactive Publication Date: 2018-08-14
HUIZHOU DESAY SV AUTOMOTIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a low-cost constant-current charging LED drive circuit, which solves the technical problem that the LED drive circuit built with existing discrete components cannot realize low-cost LED constant-current drive

Method used

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  • Low-cost constant-current charging LED driving circuit
  • Low-cost constant-current charging LED driving circuit
  • Low-cost constant-current charging LED driving circuit

Examples

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Embodiment Construction

[0024] The implementation of the present invention will be explained in detail below in conjunction with the accompanying drawings. The examples are given for illustrative purposes only, and should not be understood as limiting the present invention, including the selection and value of the components and the accompanying drawings. Examples are for reference and illustration only, and do not constitute a limitation to the patent protection scope of the present invention, because many changes can be made to the present invention without departing from the spirit and scope of the present invention.

[0025] A circuit connection diagram of a low-cost constant current charging LED drive circuit provided by the embodiment of the invention, as shown in image 3 shown. In this embodiment, the low-cost constant current charging LED drive circuit is provided with a power input terminal B+ connected to the power supply Battery, and is also provided with a first resistor R1, a second res...

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Abstract

The invention relates to the technical field of LED driving, and specifically discloses a low-cost constant-current charging LED driving circuit. The driving circuit has a power supply input end connected with a power supply, and also comprises a first resistor, a second resistor, a first diode, a second diode, a lighting-on induction switch, a triode and a light emitting diode. According to the low-cost constant-current charging LED driving circuit provided by the invention, through establishment of the triode, the diodes and other components, LED luminance stability is realized, and it is ensured that the LED luminance is still unchanged in an LED power supply voltage fluctuation condition; through a received external low-level feedback lighting-on signal, the LED is driven directly, sothat occupation of an MCU port is avoided, and the system MCU port resource is saved; and by adoption of establishment of the resistors, the diodes, the triode and other low-cost electronic components, and compared with the existing circuit which adopts a scheme of adopting an LDO voltage-stabilizing chip to realize LED constant current driving, the cost is greatly lowered and higher cost performance is achieved in the invention.

Description

technical field [0001] The invention relates to the technical field of LED driving, in particular to a low-cost constant current charging LED driving circuit. Background technique [0002] At present, in the automotive air-conditioning controller, the lighting signals of some light-emitting diodes (hereinafter referred to as LEDs) come from low-level feedback signals from external devices, such as seat heating indicators, rear defrosting indicators, etc., and the principle diagram of its realization As attached to the manual figure 1 Shown: When the air-conditioning controller receives an external low-level lighting signal such as the seat heating lighting feedback signal, it will be input to its MCU for detection, and the MCU will control the LED drive circuit to control the LED on or off after detection . [0003] The LED driving circuit is built by discrete components, and the schematic diagram of the circuit is attached in the manual. figure 2 As shown, it mainly inc...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00
Inventor 梁展鸿周小东黄冲
Owner HUIZHOU DESAY SV AUTOMOTIVE
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