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Current Limiting Circuits, Page 1
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Last Updated on: Friday, August 21, 2015 06:59 AM


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

13.8 Volt 20A PSU -  This is a Regulated DC power supply with short circuit protection and with current limiter. . . .  [Andy Collison's website]

 

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. . . .  [by N1HFX]

 

13.8V 20A PSU -  This is a Regulated DC power supply with short circuit protection and with current limiter. . . .  [Andy Collison's website]

9 Volt 2 Amp Power Supply -  A simple 9 Volt 2 Amp supply using a single IC regulator. . . .  [Andy Collison's website]

 

A Current Limiting Bench 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 project for the first time or soak-test a piece of equipment. . . .  [Circuit design by Ron J.]

 

Add Latch-Off Current Limit to Regulator -  03/30/00 EDN Design Idea   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. . .  [by Craig Varga, Linear Technology Corp, Milpitas, CA]

Add trimmable current limit to DC/DC supply -  08/01/97  EDN Design Idea   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 . . .  [by Terry Millward, Maxim Integrated Products UK Ltd, Theale, UK]

 

An Add-On Current Limiter for Your PSU -  This circuit allows you to set a limit on the maximum output current available from your PSU. It's very useful when. . . .  [Circuit design by Ron J.]

 

AN-8 Hiccup Mode Current Limiting -  Application Note Microsemi 1303. . .  [Microsemi Corp]

 

Circuit Adds Latch-Off Current Limit to Regulator -  03/30/00 EDN Design Idea   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. . .  [by Craig Varga, Linear Technology Corp, Milpitas, CA]

 

Circuit Provides Hiccup-Current Limiting -  06/26/03  EDN Design Idea   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; . . .  [by CH How and KP Basu, Multimedia University, Cyberjaya, Malaysia]

 

Comparator adds current limit to V2 controller -  05/21/98 EDN Design Idea   (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 provides several speed improvements over conventional control schemes by improving the transient response of buck regulators. . .  [by Dimitry Goder, Switch Power Inc, Campbell, CA]

 

Current Limit Protects Power Bus -  12/18/97 EDN Design Idea   The circuit in Figure 1 protects a power bus from a load short within a guaranteed 2 µsec; a short could otherwise pull down the bus, affecting other loads. The circuit also controls inrush current to bypass capacitors during hot-swap (hot insertion) , another situation in which bus voltage could otherwise experience a droop. You can individually set the two current limits. Power-on reset and logic controls allow complete µP interfacing. . . .  [by Ron Lenk, Temic/Siliconix, Santa Clara, CA]

 

Current Limiter Allows Large USB Bypass Capacitance -  08/06/09  EDN Design Idea   A current-sense Amplifier limits inrush current. . .  [by Daniel Morris, Group IV Technology, Renton, WA]

 

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

 

Current Limiting Bench 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 project for the first time or soak-test a piece of equipment. . . .  [Circuit design 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 project for the first time or soak-test a piece of equipment. . . .  [Design by Ron J.]

 

Current Limiting Resistor Calculator information -  The calculators on this page can be used to find current limiting resistors and currents for Light Emitting Diodes. The first calculator determines the resistance for a desired LED current while the second calculates the current for a given resistance. . . .  [from Rob Paisley's Model Train web site]

 

Current-limit switch is digitally programmable -  08/17/00EDN Design Idea   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 h. . .  [by Budge Ing, Maxim Integrated Products, Sunnyvale, CA]

 

Current-Limit Switch Is Digitally Programmable -  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. This application note illustrates the implementation of a digitally programmable current-limit switch using MAX890L a current-limited, high-side P-channel switch and MAX5160 digital potentiometer[Application Note 298]. . .  [Maxim Integrated]

 

Current-Limited DC/DC Converter Simplifies USB Power Supplies -  DN252 Design Notes (Linear Technology) . . .  [Linear Technology]

 

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 -  Application Note 32 --Dual Current-Limiting Switch for USB Applications. . .  [Micrel]

 

Hiccup Mode Current LimitingAN-8 -  Application Note 8. . .  [Microsemi Corp]

 

Inrush current limiter stops surges -  08/02/07 EDN Design Idea   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. . . .  [by Gregory Mirsky]


Current Limiting Circuits:  #'s-K     L-Z


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