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Battery Backup Electronic Circuits
 

Last Updated: December 25, 2017 01:46 PM


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

12 Volt Battery Backup -  This simple project makes a nice companion to power units in cas of power outages, especially caused by severe weather __ Designed by Lennie Zink

12V Input to 5V Outputs High Peak-Power & Backup Supply using Two Supercapacitors with Input Voltage Monitoring -  The LTC4425 is a constant-current/constant-voltage linear charger designed to charge a 2-cell supercap stack from either a Li-Ion/Polymer battery, a USB port, or a 2.7V to 5.5V current-limited supply.  The part operates as an ideal diode with an extremely low 50mΩ on-resistance making it suitable for high peak-power/low average __ Linear Technology/Analog Devices App Note, Mar 24th 2010

3.3V at 1.5A from 5V Peak-Power & Back-up Supply using Two Supercapacitors -  The LTC4425 is a constant-current/constant-voltage linear charger designed to charge a 2-cell supercap stack from either a Li-Ion/Polymer battery, a USB port, or a 2.7V to 5.5V current-limited supply.  The part operates as an ideal diode with an extremely low 50mΩ on-resistance making it suitable for high peak-power/low average __ Linear Technology/Analog Devices App Note, Mar 24th 2010

3.3V Piezo Energy Harvester with 9V Battery Backup -  The LTC3588-1 integrates a low-loss full-wave bridge rectifier with a high efficiency buck converter to form a complete energy harvesting solution optimized for high output impedance energy sources such as piezoelectric transducers. __ Linear Technology/Analog Devices App Note, Mar 23, 2010

5V to 16V Solar-Powered 2.5V Supply with Supercapacitor for Increased Output Energy Storage & Battery Backup -  5V to 16V Solar-Powered 2.5V Supply with Supercapacitor for Increased Output Energy Storage and Battery Backup __ Linear Technology/Analog Devices App Note, Mar 23, 2010

Alarm Phone Dialer with MT8880 & PIC 16F84A -  Just hook this Alarm Phone Dialer up to something you would like to monitor, for example, a high water alarm, low temperature alarm, back window, garage door, etc.  When the system is activated it will call a number of programmed numbers to let you know the alarm has been activated.  This would be great to get alerts of alarm conditions from your home when you are at work.  The microcontroller code is provided on the site. 

An Adjustable Video Cable Equalizer using the LT1256 -  DN92 Design Notes __ Linear Technology/Analog Devices

An Alarm Power Supply with Battery Back-up -  Power Supply Circuits:  This Power Supply is suitable for the Modular Burglar Alarm.  However, it has other applications.  It is designed to provide an output of 12-volts, with a current of up to 1-amp.  In the event of mains failure, the back-up battery takes over automatically.  When the mains is restored, the battery recharges. __ Designed by Ron J.

Battery Backup Converter uses One NiCd Cell -  02/03/97 EDN-Design Ideas Notebook computers and or portable equipment often use a backup battery to retain memory contents during replacement ofmain battery.  Such "bridge batteries" usually consist of five or six series-connected NiCd coin cells.  They're expected to keepsystem alive for approximately 5 minutes—plenty of time to swap batteries __ Circuit Design by David Bell, Linear Technology App Note, Milpitas, CA

Battery Backup Regulator is Glitch-Free & Low Dropout -  DN170 Design Notes __ Linear Technology/Analog Devices

Battery Booster Delivers 75W -  07/16/98 EDN-Design Ideas -   (File has several circuit ideas.  Scroll to find this one.) The circuit in Figure 1defies no laws of physics; it just makes creative use of an isolated DC/DC converter.  The application uses the isolated converter in a nonisolated configuration to boost a 48V battery voltage to 60V.  The __ Circuit Design by Donald V Comiskey, Power Trends Inc, Warrenville, IL

Bi-Directional Buck-Boost Supercapacitor Backup Supply -  The LT8705 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage.  The part has integrated input current, input voltage, output current and output voltage feedback loops.  With a wide 2.8V to 80V input and 1.3V to 80V output range, the LT8705 __ Linear Technology/Analog Devices App Note, Feb 15th 2013

Buck Converter Handles Battery-Backup SystE - M -  04/24/03  EDN-Design Ideas __ Circuit forms gamma-photon detectorA synchronous buck converter is inherently bidirectional.  That is, it transfers energy from input to output as a buck regulator when the output voltage is low, but, when the output voltage is high, the converter acts as a boost regulator, transferring power from output to input.  This design idea shows how to use this bidirectional energy transfer to automatically recharge a battery when the mai __ Circuit Design by Haresh Patel, Linear Technology Corp, Milpitas, CA

Dual Smart Battery Charger Simplifies Battery Backup for Servers -  DN342 Design Notes __ Linear Technology/Analog Devices

Dual Supercapacitor Backup Power Supply, 0.5V to 5V -  The LTC3122 is a synchronous step-up DC/DC converter with true output disconnect and inrush current limiting.  The 2.5A current limit along with the ability to program output voltages up to 15V makes the LTC3122 well suited for a variety of demanding applications.  Once started, operation will continue with inputs down to 500mV, __ Linear Technology/Analog Devices App Note, Jun 19th 2013

Efficient LED Power Supply Has Battery Backup -  04/08/10 EDN-Design Ideas Power three to six LEDs from an ac- or dc-power source and charge a backup battery. __ Circuit Design by Zhihong Yu, Juno Lighting Group, Des Plaines, IL

Emergency Power -  This unit was constructed in a plastic 4-outlet juction box ($5 from Home Depot).  The front panel is cut from 60-thou Lexan, and a scrapped Pep-Boys battery charger provided the transformer.  The PIC16F870 keeps track of battery voltage as well as both charging and discharging currents. __ Designed by Luhan Monat-Mesa Arizona

LED Power Supply Has Battery Backup -  04/08/10 EDN-Design Ideas Power three to six LEDs from an ac- or dc-power source and charge a backup battery. __ Circuit Design by Zhihong Yu, Juno Lighting Group, Des Plaines, IL

Li-Ion Backup Supply -  The LTC3226 is a 2-cell series supercapacitor charger with a backup PowerPath controller.  It includes a charge pump supercapacitor charger with programmable output voltage, a low dropout regulator, and a power-fail comparator for switching between normal and backup modes.  The constant input current supercapacitor charger is __ Linear Technology/Analog Devices App Note, Jul 8th 2011

Memory supply includes battery backu -  02/03/97 EDN-Design Ideas The 5 to 3.3V switching regulator in Figure 1 includes battery-backup power for low-voltage memory if the 5V supply fails.  The design of such a backup circuit is difficult if only one NiCd or NiMH
cell is available for the backup power source and you assume that the standby current drain on the 3.3V supply is in the 5- to 10-mA range.  Also, for the battery backup to function correctly, several actions are necessary when the switchover to backup power occurs.  One is that the whole circuit must disconnect from the 5V supply; otherwise, the battery tries to power the whole system.  Also, the switcher must shut down to a micropower condition.  The circuit in Figure 1 accomplishes all of these tasks. __ Circuit Design by Craig Varga, Linear Technology Corp, Milpitas, CA

Microcontroller provides SRAM battery backup -  26-Jun-03 EDN-Design Ideas To maintain content in the event of power loss, many designs that include SRAM require a dedicated device that can automatically switch from a standard power supply to battery operation.  Microcontrollers seldom find use in power-switching applications.  Because microcontrollers typically operate from the primary power supply, they stop execution if that supply drops, thereby making it impossible __ Circuit Design by Dave Bordui, Cypress Semiconductor, Orlando, FL

Piezoelectric Energy Harvester with Battery Backup -  The LTC3388-1/LTC3388-3 are high efficiency step-down DC/DC converters with internal high side and synchronous power switches that draw only 720nA typical DC supply current at no load while maintaining output voltage regulation.  The EN pin can be used to activate the LTC3388-1/LTC3388-3.  For instance, in this circuit the __ Linear Technology/Analog Devices App Note, Oct 26th 2010

Power Backup System using Supercapacitors -  This circuit shows a power holdup system that incorporates a Supercapacitor stack with the capacity to provide standby power of 165mW for about 45 seconds in the absence of battery power.  An LDO converts the output of the Supercapacitor stack to a constant voltage supply during backup mode. __ Linear Technology/Analog Devices App Note, Jan 30th 2012

Priority Switching from 12V Main Supply to 14.8V Battery Backup -  The LTC4417 connects one of three valid power supplies to a common output based on priority.  Priority is defined by pin assignment, with V1 assigned the highest priority and V3 the lowest priority.  A power supply is defined as valid when its voltage has been within its overvoltage (OV) and undervoltage (UV) window continuously __ Linear Technology/Analog Devices App Note, Feb 15th 2013

Solar-Powered 2.2V Supply with Li Battery Backup & Run Threshold Set to Battery Minimum Voltage -  The LTC3103 is a high efficiency, monolithic synchronous step-down converter using a current mode architecture capable of supplying 300mA of output current.  Additionally, the LTC3103 includes an accurate RUN comparator, thermal overload protection, a power good output and an integrated soft-start feature to guarantee that the __ Linear Technology/Analog Devices App Note, Dec 5th 2011

Switching Current Pump Makes Better Charge -  01/16/97 EDN-Design Ideas Many currently proposed battery-charger designs are simply voltage regulators redesigned to be current sources.  Unfortunately, this design approach is far from optimal because it leads to unnecessary hardware redundancy and complexity.  This type of charger also raises a stability problem because of the additional active device in the feedback loop __ Circuit Design by David Bell, Linear Technology App Note, Milpitas, CA

Unipolar Energy Harvester Charges Battery Backup -  The LTC3109 is a highly integrated DC/DC converter ideal for harvesting surplus energy from extremely low input voltage sources such as TEGs (thermoelectric generators) and thermopiles.  Its unique, proprietary autopolarity topology allows it to operate from input voltages as low as 30mV, regardless of polarity.  In this circuit, __ Linear Technology/Analog Devices App Note, Jul 8th 2010


Battery Backup Electronic Circuits


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