Надежная схема бесперебойного питания от аккумулятора

A reliable uninterruptible power supply circuit consists of only two diodes connected by cathodes. The positive potential of the power supply unit is connected to the anode of one diode. And to the anode of the other - the positive terminal of the battery, which avoids equalizing currents caused by the voltage inequality. The power supply voltage must be at least 1 ... 2 V higher from the battery. This uninterrupted power supply from the battery provides backup power for the electronic device with the voltage of the main current source.