When to disconnect mini ups power supply?
It can also be used as a work bench power supply that provides 12V, 9V and 5V operating voltages. The circuit immediately disconnects the load when the battery voltage reduces to 10.5V to prevent deep discharge of the battery.
What are the diodes in a mini UPS system?
A standard step-down transformer provides 12V of AC, which is rectified by diodes D1 and D2. Capacitor C1 provides ripple-free DC to charge the battery and to the remaining circuit. When the mains power is on, diode D3 gets forward biased to charge the battery. Resistor R1 limits the charging current.
What kind of battery do I need for mini ups?
My Smartphone (One Plus 6) battery is rated for 3300mAh. The final capacity required is = 810 + 3300 x0.4 = 2130 mAh By taking the losses in the converter into consideration, I have chosen a 3400mAh Panasonic battery for this mini UPS. The charging status of the 18650 battery is indicated by two LEDs on the TP4056 module.
How do I connect my Mini ups to my router?
Plug in the UPS to standard micro USB mobile charger (5v/1A). During the charging process, the red LED will be ON and when the charge finished it will be turned off and the green LED will be switched ON. Now connect the Mini-UPS the to router by using the adapter cable prepared in the earlier step. The router LEDs should lit up.
When to use a cut off circuit in a mini ups?
When the battery voltage or input voltage falls below 10.5V, a cut-off circuit is used to prevent deep discharging of the battery. Resistor R3, zener diode ZD1 (10.5V) and transistor T2 form the cut-off circuit. When the voltage level is above 10.5V, transistor T2 conducts and its base becomes negative (as set by R3, VR2 and ZD1).
Is the battery charger included in an ups circuit?
If it’s an UPS, the inclusion of a battery charger circuit becomes imperative. Keeping the low cost and simplicity of the design in mind, a very simple yet reasonably accurate battery charger design has been incorporated in this uninterruptible power supply circuit. Looking at the figure we can simple witness how easy the configuration is.