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LED constant current drive circuit with adjustable output current

A technology of constant current drive and output current, applied in the field of LED constant current drive circuit, can solve the problems of complex structure, high cost, and many circuit electronic components, and achieve the effect of simple circuit structure, low cost, and guaranteeing constant current accuracy.

Inactive Publication Date: 2017-08-29
SINOPOL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are relatively many electronic components in the circuit, the structure is relatively complicated, and the cost is also high.

Method used

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  • LED constant current drive circuit with adjustable output current

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Embodiment Construction

[0014] The embodiments involved in the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0015] like figure 1 Shown: a LED constant current drive circuit with adjustable output current, including DC input power supply E, power switch K, anti-reverse connection diode D1, bypass capacitor C, sampling resistor R, NMOS tube Q, constant current driver U, LED loads D1 and D2. Among them, the DC input power E is 2.7-5.5V, and a single 1000mAh lithium battery can be used. The constant current driver U uses HX7136, which is a low-dropout LED linear step-down constant-current driver chip, which forms the stable operation of the entire working loop by sampling the output current as negative feedback. The CS pin of HX7136 is the current setting pin, the DRV pin is the external NMOS drive pin, the VDD pin is the chip power pin, and the GND pin is the chip ground pin.

[0016] The VDD pin of HX7136 is respectively connected to th...

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Abstract

The invention provides an LED constant current drive circuit with an adjustable output current. The LED constant current drive circuit comprises a direct current input power, a power switch, an anti-reverse connection diode, a bypass capacitor, a sampling resistor, an NMOS tube, a constant current diver and an LED load. Output current adjustability can be realized by using only few circuit components, and meanwhile constant current precision of the output current can also be guaranteed, so that the circuit is simple in structure and relatively low in cost and can be widely applied to lighting equipment such as LED electric torches, LED table lamps and LED miner lamps.

Description

Technical field: [0001] The invention relates to an electronic circuit, in particular to an LED constant current drive circuit with adjustable output current. Background technique: [0002] At present, LED constant current drivers want to achieve adjustable output current, and most of them use a single-chip microcomputer to compare the constant current with the feedback current of a special detection circuit, thereby adjusting the duty cycle of the output PWM pulse signal. Its circuit has relatively many electronic components, its structure is relatively complicated, and its cost is also high. Invention content: [0003] (1) Solved technical problems [0004] In order to solve the above problems, the present invention proposes an LED constant current drive circuit with adjustable output current. [0005] (2) Technical solutions [0006] A LED constant current drive circuit with adjustable output current, including a DC input power supply, a power switch, an anti-reverse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37
Inventor 陈永桥
Owner SINOPOL ELECTRONICS TECH
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