Power Cube UPS (12V, 5V, 3.3V)

Design Highlights:

AC 220V high-voltage isolation real-time detection technology, pure hardware control circuit, achieving seamless switching between lithium battery power and automatic switching back upon power restoration;
7.4V dual-cell lithium battery charging management chip circuit supports trickle, constant current, and constant voltage charging modes;
7.4V boost to 12V, using a BOOST boost chip solution with a maximum output current support of 10A;
12V buck to 5V, using a high-efficiency synchronous buck BUCK chip solution with a maximum support of 4A;
5V output supports USB-A interface output to power various USB interface devices;
DC 12V, 5V, and 3.3V power outputs, equipped with banana plug female connectors and matching clip cables;
Two DC power sockets with an inner diameter of 2mm and an outer diameter of 6.3mm, which can connect to a 12V adapter and power devices;

Control Logic:

When 220V is available: external adapter supplies 12V, lithium battery starts charging, lithium battery boost circuit stops working;
when 220V... When there is no power: the external adapter stops supplying power, the lithium battery stops charging, and the lithium battery boost circuit starts working to output 12V;

circuit parameters and test data:
DC output voltage and current: DC 12V 8A, DC 5V 4A, DC 3.3V 1A;
DC input voltage and current: DC 12V 2A; AC
input voltage: AC 220V; lithium
battery capacity: 1000mAh; lithium battery
capacity: two 7.4V batteries in series;
 
application scenarios:
uninterrupted 12V, 5V, and 3.3V power supply equipment: power supplies, routers, optical modems, cameras, etc.