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Current Limiting Circuits
 

Last Updated: December 31, 2017 06:47 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

13.8 Volt 20A PS - U -  This is a Regulated DC power supply with short circuit protection and with current limiter.   __ Designed by Andy Collison

13.8V 10A power supply -  Sometimes amateurs like to home-brew their power supplies instead of purchasing one off the shelf at any of the major ham radio retail dealers.  The advantage to rolling your own power supply is that it teaches us how they work and makes it easier to troubleshoot and repair other power supply units in the shack.  It should be noted that there is no real cost advantage to building your own power supply unless you can get a large power transformer and heat sink for a super low price.  Of course rolling our own gives us the ability to customize the circuit and make it even more reliable than commercial units.   __ Designed by N1HFX

13.8V 20A PS - U -  This is a Regulated DC power supply with short circuit protection and with current limiter.   __ Designed by Andy Collison

9 Volt 2 Amp PS - U -  A simple 9 Volt 2 amp supply using a single IC regulator.   __ Designed by Andy Collison

A Current Limiting Bench Power Supply -  Power Supply Circuits:  This is a 1-amp variable-voltage PSU.  It adjusts from about 3v to 24v: and has the added feature that you can limit the maximum output current.  This is invaluable when   (for example) you power-up a project for the first time or soak-test a piece of equipment.  __ Designed by Ron J.

Add Latch-Off Current Limit to Regulator -  03/30/00 EDN-Design Ideas In many applications, forcing a high-current power supply to latch off if a sustained fault condition exists can minimize the likelihood of damage to the pc-board traces and the power devices in the supply.  Pulse-width-modulation__ Circuit Design by Craig Varga, Linear Technology Corp, Milpitas, CA

Add trimmable current limit to DC/DC supply -  08/01/97 EDN-Design Ideas You can add a simple, two-transistor circuit to a standard, step-down DC/DC converter to provide an adjustable limit for the output current.  You can apply this method to most step-down converters that provide access to the feedback node__ Circuit Design by Terry Millward, Maxim Integrated Products UK Ltd, Theale, UK

An Add-On Current Limiter for Your PS - U -  Power Supply Circuits:  This circuit allows you to set a limit on the maximum output current available from your PSU.  It's very useful when you power-up a project for the first timeor carry out a soak-test.  By setting an upper limit on the current available from your PSUyou can protect both your power supplyand any device connected to it.  It offers a simple and cheap alternative to the Current Limiting Power Supply.  __ Designed by Ron J.

Circuit Adds Latch-Off Current Limit to Regulator -  03/30/00 EDN-Design Ideas In many applications, forcing a high-current power supply to latch off if a sustained fault condition exists can minimize the likelihood of damage to the pc-board traces and the power devices in the supply.  Pulse-width-modulation__ Circuit Design by Craig Varga, Linear Technology Corp, Milpitas, CA

Circuit Provides Hiccup-Current Limiting -  06/26/03  EDN-Design Ideas Current-limit protection is an essential feature for power-supply systems.  The three major types of current-limit-protection mechanisms are constant, foldback, and hiccup.  Hiccup current limit performs the best of the three types; __ Circuit Design by CH How and KP Basu, Multimedia University, Cyberjaya, Malaysia

Comparator adds current limit to V2 controller -  05/21/98 EDN-Design Ideas -  (File has several  circuits, scroll down) Many step-down controllers satisfy the need for generating low voltages for µPs and logic.  The lower the output voltage, the greater the importance of building a system with fast transient response.  Some new controllers use the V2 control architecture, which provIdeas several speed improvements over.__ Circuit Design by Dimitry Goder, Switch Power Inc, Campbell, CA

Current Limit Protects Power Bus -  12/12/97 EDN-Design Ideas Protects a power bus from a load short within a guaranteed2 µsec response Time__ Circuit Design by Ron Lenk, Temic/Siliconix, Santa Clara, CA

Current Limiter Allows Large USB Bypass Capacitance -  6-Aug-09 EDN-Design Ideas A current-sense amplifier limits inrush current__ Circuit Design by Daniel Morris, Group IV Technology, Renton, WA

Current limiter provides latch-up signal -  01/01/98 EDN-Design Ideas Current-limiting circuit both signals a latch-up condition and prevents latch-up-induced overcurrent destruction of a CMOS IC or group of ICs__ Circuit Design by Hartmut Henkel, von Hoerner & Sulger GmbH, Schwetzingen, Germany

Current Limiting Bench Power Supply -  Power Supply Circuits:  This is a 1-amp variable-voltage PSU.  It adjusts from about 3v to 24v: and has the added feature that you can limit the maximum output current.  This is invaluable when   (for example) you power-up a project for the first time or soak-test a piece of equipment.  __ Designed by Ron J.

Current Limiting Power Supply -  This is a 1-amp variable-voltage PSU.  It adjusts from about 3v to 24v: and has the added feature that you can limit the maximum output current.  This is invaluable when (for example) you power-up a.   __ Designed by Ron J.

Current-limit switch is digitally programmable -  08/17/00  EDN-Design Ideas Current-limit switches are virtually ubiquitous in system controls.  They provide a safe means for regulating the current delivered to a load circuit.  The switches allow the load current to increase to a programmed limit but no higher.  Typically, the current limit is a function of the voltage across an external resistor, produced by the current from a fixed source internal to the switch IC.  This__ Circuit Design by Budge Ing, Maxim Integrated Products, Sunnyvale, CA

Current-Limit Switch Is Digitally Programmable -  App Note/ 298 / Dec-04___ Maxim Integrated

Current-Limited DC/DC Converter Simplifies USB Power Supplies -  DN252 Design Notes___ Linear Technology/Analog Devices

Dispensation Limiter -  This circuit keeps a fixed voltage across a voltage regulator, regardless of load or voltage setting.  It provides most of the efficiency of a SCR regulator and precision of a linear.   __ Designed by Andrew R. Morris

Dual Current-Limiting Switch for USB Applications -  App Note 32 --Dual Current-Limiting Switch for USB Applications __ Designed by Micrel

Inrush current limiter stops surges -  08/02/07 EDN-Design Ideas Active circuit and relay replace lossy negative-temperature-coefficient thermistor.  Offline power supplies that drive loads of 200W and more require inrush-current limiters.  Unrestricted inrush currents can reach hundreds of amperes, which may damage the line rectifier, open the fuse and input-filter inductors, and damage the PFC (power-factor-correction) filter capacitors.  A simple method of limiting the inrush current uses an NTC (negative-thermal-coefficient) thermistor that connects in series with the supply line.  __ Circuit Design by Gregory Mirsky

Inrush-current limiter stops surges -  08/04/07 EDN-Design Ideas Active circuit and relay replace lossy negative-temperature-coefficient thermistor__ Circuit Design by Gregory Mirsky, Juno Lighting Group, ModuLight Division, Des Plaines, IL

L200 Power Supply -  Power supply with variable voltage and fixed current regulation made using the ubiquitous L200C regulator.   __ Designed by Andy Collison

LED-Current Limiter Accepts AC or Dc -  07/14/11  EDN-Design Ideas Prevent excessive current from overdriving your LEDs.  LED drivers have lots of features and require plenty of external components.  When your application requires no PWM (pulse-width-modulated) dimming or controlled frequency operation, your primary concern may be that too much current could damage or destroy your LEDs.  In this case, you can make a simple LED-current limiter from a common low-dropout linear regulator.  The circuit in Figure 1 is an LED light bulb for a landscape-lighting system.  Landscape lighting typically operates from 12V ac, and peak voltage is approximately 17V.  Because the regulator is in series with the LED string, the LED-string current equals the regulator’s output current.  __ Circuit Design by Roger Griswold, Micrel, San Jose, CA

Network linearizes DC/DC converter's current-limit characteristics -  10/13/05 EDN-Design Ideas Thermistor adds to efficiency, eliminates sense resistor__ Circuit Design by John Guy and Lance Yang, Maxim Integrated Products Inc, Sunnyvale, CA

Pira CZ Stereo Encoder for FM Broadcasting -  This stereo encoder is a halfway between analogue and digital processing.  It combines the best from both domains to provide high-quality and easy to build device.  The sampling frequency used in this stereo encoder is 97 times __   Jan Kolar

Provides Hiccup-Current Limiting -  06/26/03  EDN-Design Ideas Current-limit protection is an essential feature for power-supply systems.  The three major types of current-limit-protection mechanisms are constant, foldback, and hiccup.  Hiccup current limit performs the best of the three types; __ Circuit Design by CH How and KP Basu, Multimedia University, Cyberjaya, Malaysia

Rechargeable Flashlight Obsoletes Lantern Battery -  12/11/03 EDN-Design Ideas This design idea describes a high-intensity, rechargeable flashlight system that you can build from a 6V lantern-type flashlight.  The rechargeable battery comprises four 2V, 2.5-Ahr(ampere-hour] SLA(sealed lead-acid] cells, similar in size to a standard D-sized battery.  SLA cells are especially well-suited to powering flashlights because of their low self-discharge rate__ Circuit Design by Fran Huffart, Linear Technology, Milpitas, CA

Series lamp limiter -  The idea behind this project is not new.  Engineers and enthusiasts have used it for yearsso it is well proven.  It is also very simpleconnect a 100W lamp bulb in series with the supply to the set.  At 230V, a 100W lamp requires about 400mA to illuminate fully.  Therefore, the maximum current that can flow through your faulty set is 400mA.  At this current, virtually all the voltage is dropped across the lamp, not across the set __ Designed by Paul Stenning

Simple Circuit & effective inrush current limiter stops surges -  08/02/07 EDN-Design Ideas Active circuit and relay replace lossy negative-temperature-coefficient thermistor.  Offline power supplies that drive loads of 200W and more require inrush-current limiters.  Unrestricted inrush currents can reach hundreds of amperes, which may damage the line rectifier, open the fuse and input-filter inductors, and damage the PFC (power-factor-correction) filter capacitors.  A simple method of limiting the inrush current uses an NTC (negative-thermal-coefficient) thermistor that connects in series with the supply line.  __ Circuit Design by Gregory Mirsky

Simple Circuit & effective inrush-current limiter stops surges -  08/04/07 EDN-Design Ideas Active circuit and relay replace lossy negative-temperature-coefficient thermistor__ Circuit Design by Gregory Mirsky, Juno Lighting Group, ModuLight Division, Des Plaines, IL

Simple Circuit current limiting for LED flashlights -  I have modified my 3-White LED 3-AA cell flashlight by adding filament bulbs in series with the LED's to form a "ballast" utilizing the positive resistance-vs-temp characteristic of tungsten as a simple current source.  I did this to increase the battery life (at the expense of initial brightness), and to increase the lifetime of the LED's.  The flashlight, which was given to me, appears to be an early C. Crane unit. As in most of these simple lights, the 3 LED's are wired in parallel on a tiny circular PC board and connected directly to the 3 AA Alkaline cells. __

Soft limiter for oscillators uses emitter-degenerated differential pair -  10/12/06 EDN-Design Ideas Phase-shift network plus a few active components yields low-distortion outputMost oscillator circuits include a nonlinear amplitude control that sustains oscillations at a desired amplitude with minimum output distortion.  One approach uses the output sinusoid's amplitude to control a circuit element's resistance, such as that of a JFET operating in its triode-characteristics region.  Another control method uses a limiter circuit that allows oscillations__ Circuit Design by Douglas Sudjian, Resonext Communications Inc, San Jose, CA

Stereo Limiter -  Stereo Broadcast Limiter Circuit for Ramsey.   __

Voltage Reference sets Current Limit -  11/19/98 EDN-Design Ideas NOTE :  File contain several designs.  Scroll to find this one.  Power op amps have a real need for active output-current limiting.  Most power-amplifier designs rely on the voltage drop across a user-supplied sense resistor to turn on an internal transistor.  This method has several drawbacks, notably, an inability to change the current-limit point under program control.  The current-limit circuit in Figure 1 allows you to establish the setpoint by applying a voltage to one of the amplifier's pins.__ Circuit Design by Joe Engle, Burr-Brown Corp, Tucson, AZ


Current Limiting Circuits


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