11/25/2023 0 Comments Battery backup for home electronicsThe LTC4416 contains a precision comparator that detects when the main supply has failed and switches over to its backup supply using four external P-channel MOSFETs (PFETs).Ī simpler form of this circuit is a dual diode OR configuration where the cathodes of two diodes are joined and the main and backup supplies are connected to the anodes. This is a dual ideal diode and was responsible for switching between the main supply voltages and the backup supplies. The clever part of the circuit was provided by the LTC4416. However, the safety aspect of keeping the battery charger permanently connected in an unventilated room depends on the type of the battery and charger used. The circuit can be operated either with the battery charger permanently connected or not. The wide input voltage range of the LTC3789 and the LT8608 alleviated concern of high voltages being generated when the battery charger was connected. Therefore, if the charger has a good connection to the circuit, but a poor connection to the battery, a voltage can be generated that might damage the electronics. Some lower cost battery chargers can generate high voltages if they are not connected to the battery correctly, so the battery does not adequately absorb the charging current. The LT8608 and LTC3789 have maximum input voltages of 42 V and 38 V, respectively, so they were connected directly to the car battery for the highest circuit efficiency. The cordless telephone required 6.5 V at about 600 mA, so the LT8608 was chosen to provide this rail with low noise and high efficiency with an extremely low quiescent current of 2.5 μA. Since the Wi-Fi router only needed 1 A, this evaluation kit could be used to power many other applications that require 12 V. Its evaluation kit provides 12 V at 5 A from a 5 V to 36 V input voltage, so it could be used with no modification. The LTC3789 is a four switch buck-boost converter that provides a constant 12 V supply, with extremely high efficiency, from an input that could be above or below this voltage. The backup power source for this design was a preloved car battery purchased from a scrapyard for £20. The uninterruptible power supply (UPS) schematic.įigure 1 shows the circuit. This is enough to keep most laptops communicating with the outside world. This home uninterruptible power supply design provides a 12 V/5 A power supply for the Wi-Fi access point (and any other electronics) and an additional 6.5 V/1.5 A supply for a cordless telephone. Even minor dips can cause major problems. While this might be seen as a First World problem, it takes over 2 minutes for the average Wi-Fi router to reboot, and this can seem like an eternity if the power disappears in the middle of a conference call. With the threat of an energy crisis looming in early 2022 and world peace on a knife’s edge, it was designed to keep home Wi-Fi alive in the case of a power outage. The circuit in Figure 1 was designed out of necessity. An Uninterruptible Power Supply (UPS) for the Home Power outages can reduce the most sophisticated homes to quite primitive ones and this article describes the design of an uninterruptible power supply for the home that keeps alive the home’s most essential service: Wi-Fi. IntroductionĪs the world becomes more advanced, our dependence on electricity becomes more acute. This is connected to a buck-boost converter that generates a stable 12 V/5 A supply to power the Wi-Fi router, as well as a 6.5 V/1.5 A buck converter to power a cordless telephone. How can you use Wi-Fi and other at-home devices during a power outage? Answer:ĭesign a home uninterruptible power supply (UPS) by using a car battery as a backup power source. How to Build an Uninterruptible Power Supply for Home Devices
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