Current Regulator Circuits

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本文详细介绍了电流调节电路的构建方法，包括基于LM317电压调节IC的电流调节器、使用PNP和NPN晶体管的电流调节器，以及电流限制二极管的应用。还提供了低电压电源供应方案，适用于LED灯或小型灯泡，并强调了实验验证的重要性以及使用数据手册的必要性。

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from:

http://home.cogeco.ca/~rpaisley4/xCurrentReg.html

The following are current regulator circuits that could be used to drive light emitting diodes and small incandescent lamps.

They can also be used for many other applications as well.

Test these circuits at the bench before using them in practical applications.

LM317 Current Regulator

The following is a current regulator built around the LM317 voltage regulator IC. For additional information, see the datasheet for the LM317 series regulators.

Transistor Based Current Regulators

The following are current regulators built with PNP and NPN transistors.

Circuit B is more accurate and has better regulation over a larger input range than circuit A.

Circuit B can be replaced with (fixed) current regulating diodes similar to those in the datasheet links below.

Current Regulatating Diodes And Other Devices

The following links are for Current Limiting Diode data sheets.

http://www.centralsemi.com/pdf/cclm0035-5750.pdf

http://www.centralsemi.com/pdf/cclhm080-150.pdf

The following links is for the LM334 current regulator data sheet.

http://www.national.com/ds/LM/LM334.pdf

Low Voltage Power Supplies For LEDs Or Lamps

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Please Read Before Using These Circuit Ideas

The explanations for the circuits on these pages cannot hope to cover every situation on every layout. For this reason be prepared to do some experimenting to get the results you want. This is especially true of circuits such as the "Across Track Infrared Detection" circuits and any other circuit that relies on other than direct electronic inputs, such as switches.

If you use any of these circuit ideas, ask your parts supplier for a copy of the manufacturers data sheets for any components that you have not used before. These sheets contain a wealth of data and circuit design information that no electronic or print article could approach and will save time and perhaps damage to the components themselves. These data sheets can often be found on the web site of the device manufacturers.

Although the circuits are functional the pages are not meant to be full descriptions of each circuit but rather as guides for adapting them for use by others. If you have any questions or comments please send them to the email address on the Circuit Index page.