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Battery Monitors
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Battery Monitors: #-B
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Last Updated on:
Thursday, November 30, 2017 01:57 PM |
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Circuits Designed by Dave Johnson, P.E. : |
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VOLT LOW BATTERY VOLTAGE FLASHER
This circuit is designed to monitor two alkaline cells (3v) that form the battery
often used in portable electronic equipment. It use an inexpensive IC from
Panasonic that is connected to an efficient LED flashing circuit. When the
battery voltage drops below a certain point the circuit flashes the LED. In
the off state the circuit draws only 1uA, while in the active flashing state it
draws 20uA. Published in EDN, Jan 2, 1997
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9v Battery Voltage Monitor
This circuit turns
on a LED whenever the voltage of a standard 9v battery connected to the circuit
drops below 7.2 volts. It uses a LTC1440 comparator, which also contains a
1.18v reference diode. In standby mode, the circuit draws only 4uA. (added
7/06)
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[Google-ADS/i-ad-EVEN-2SQ-GGL.htm] |
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Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
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Battery Charger Applications/ AB-32 - Fairchild Application
Notes / (app note added 6/06) |
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Battery Charger Applications/ AB-33 - Fairchild Application
Notes / (app note added 6/06) |
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Battery Charger Applications/ AB-34 - Fairchild Application
Notes / (app note added 6/06) |
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Battery Discharge Monitor - Here is a battery monitor circuit
which disconnects the load when the battery is discharged, preventing a
deep discharge which could cause permanent battery damage. The battery is
automatically reconnected when a battery charger or other DC source is
connected across the load. Select a relay which requires less than 100ma
coil current and with contacts capable of handling the load and
charging.... (added 5/09) |
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Battery Equal Charge Indicator - The circuit below illuminates an LED to
indicate unequal charges between two 12 volt lead batteries. It can be used to verify
that two batteries are connected in parallel or isolated since the LED will be off
when the voltages are equal within a tollerance, or on if the voltage difference is
greater than 100 millivolts. Three comparators....(circuit / schematic design added
6/06) |
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Battery Low Voltage Beeper - This circuit provides an audible and visual low
voltage warning for 12V battery powered devices. Idle current: 6ma Low Voltage Warning
current: 15ma…. [Circuit designed by Forrest Cook] |
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Battery monitor also enables constant power boost converter - 8-Nov-07 Issue
of EDN When powering a microcontroller directly from a battery, it is important
to monitor the battery voltage to ensure system integrity.... [Design Idea by Rex
Niven, Forty Trout Electronics, Eltham, Victoria, Australia] |
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Battery Monitor Draws 8 µor Less - 04/13/95 EDN-Design Ideas The
battery monitor in Fig 1 nominally draws 5 µA during normal operation and flashes an
alarm indicator when the battery voltage drops below a critical value. The alarm-state
current depends on the desired indicator brightness, but you can easily make the
current average less than 500 µA. This monitor was developed as a change-battery
warning.... [Design Idea by Arthur W Du Rea Jr, Science Applications International
Corp, Oak Ridge, TN] |
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Battery Monitor Emulates Auto Dashboard - 07/03/97 EDN-Design Ideas
When you use battery-powered scientific-recording equipment, you must know the state
of the battery, because an unnoticed battery run-down can lead to loss of data.
Several types of warning indicators are available, but all have their drawbacks.
Moving-coil indicators, test terminals, and digital flags, for example,.... [Design
Idea by TG Barnett and J Millar, University of London, UK] |
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Battery Monitor in Multiplecell Applications - Maxim APP 405: May 04, 2001 /
(app note added 6/03) -This application note shows the reader how to use the Dallas
Semiconductor.... Using the DS2760 or DS2761 Battery Monitor in Multiple-Cell
Applications … |
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Battery Powered Lap Top Computer Power Supply - DN18 Design Notes
(Linear Technology) (app note added 2/06) |
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Battery Voltage Monitor - (electronic circuit added 4/05) |
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Battery-Monitor - A Very Simple circuit and some Variations. Play with it.
All parts are cheap and should be easily obtained…. (design added 10/06) |
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Battery Monitors: #-B
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