Safety
/ Protection Circuits, Page 2
Safety / Protection: #-B
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Last Updated on:
Thursday, November 30, 2017 01:58 PM |
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| Circuits Designed by Dave
Johnson, P.E. : |
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CIRCUIT PROTECTS FROM BATTERY POLARITY REVERSAL
This simple circuit can protect a sensitive electronic circuit from an accidental
connection of a battery with a reversed polarity. The N-channel FET connects
the electronic device to the battery only when the polarity is correct. The
circuit shown was designed for a device powered from a single 1.5 volts button cell
battery. However, the circuit will operate with higher voltages as well.
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Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
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Circuit breaker handles Voltages to 32V - 25-May-00 Issue of EDN
The simplicity of low-side current monitoring can mask the advantages of a
high-side approach. You can monitor load currents in a power supply, a motor
driver, or another power circuit on either the high or the low side (ground].
However, don't let the ease of low-side monitoring cause you to overlook....
[Design Idea by Greg Sutterlin and Craig Gestler, Maxim Integrated Products,
Sunnyvale, CA] |
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Circuit Breaker has Programmable Delay - 01/16/97 EDN-Design
Ideas....The circuit in Figure 1 provides overload and short-circuit protection
to a 5V power-supply output. The heart of the circuit is the LT1620, a
charge-current controller designed for high-efficiency, switch-mode battery
chargers. The IC's versatility allows you to use it as an electronic circuit
breaker. The circuit amplifies the voltage across current-sense resistor....
[Design Idea by David Bell, Linear Technology Corp, Milpitas, CA] |
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Circuit breaker provides overcurrent and precise overvoltage protection -
7-Jun-07 Issue of EDN A simple circuit breaker delivers precision
overvoltage protection and overcurrent protection.... [Design Idea by Anthony H
Smith, Scitech, Bedfordshire, England; Edited by Brad Thompson and Fran
Granville] |
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Circuit Detects & Disconnects OverVoltages - 04/25/96 EDN-Design Ideas....The
circuit in Fig.1 protects circuits and systems with power supplies that may exceed safe
limits. One example is small consumer products that use external ac adapters; it's easy to
mistakenly plug in the wrong adapter. Another example is a portable system that uses a
rechargeable battery pack. If the battery pack is absent or fails to open during
recharging, a high-compliance charger can deliver excessive voltages to the system....
[Design Idea by Kerry Lacanette, National Semiconductor Corp, Santa Clara, CA] |
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Circuit ensures safety in power-on operation - 24-Apr-03 Issue of EDN
Computers find universal use in industrial-control systems. During power- and start-up
sequences (booting], the outputs of such control systems may yield uncontrolled pulses
before the software defines the correct status. If these outputs control the power-on
state of a system, these uncontrolled pulses could have dramatic consequences.... [Design
Idea by Jean-Bernard Guiot, DCS AG, Allschwil, Switzerland] |
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Circuit folds back current during fault conditions - 28-Nov-02 Issue of EDN You
can use monolithic linear regulators at currents lower than 5A for most applications. Most
manufacturers of these devices integrate current-limiting and thermal shutdown to prevent
damage during fault conditions. For currents greater than 5A, most linear supplies use
controllers that allow the user to select the pass element to handle different current
requirements.... [Design Idea by Martin Galinski, Micrel Semiconductor, San Jose, CA] |
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Circuit guards against battery reversal - 07/06/95 EDN-Design Ideas....The
circuit in Fig 1 protects a battery-operated system in two ways Q1 prevents damage
from the flow of reverse current that could occur if you install the battery backward, and
Q3 prevents the excessive current flow that could occur with a sudden load increase or a
short circuit. A properly installed battery fully enhances Q1 by pulling i.... [Design
Idea by Dana Davis, Maxim Integrated Products, Sunnyvale, CA] |
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