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I have finally got my PCBs for MPPT Supercap/Li-ion UPS. It took almost one month for them to be delivered from China, because of the holidays. Usually I get them two weeks after ordered.

At the first glance PCBs look good. But, I forgot to cover the vias with solder mask. Now it is time to solder the first one and hope that it works. :)

MPPT UPS PCB revision 1.0, front.

MPPT UPS PCB revision 1.0, back.


Horray! I have finished PCB design for a first revision of the Maximum Power Point Tracking (MPPT) Supercapacitor and Li-ion Uninterrupted Power Supply (UPS).

The device contains a charger with Constant Current (CC)/Constant Voltage (CV) regulation with the input voltage range of 3 to 12 V, based on TPS63060. Charging of two supercapacitors in series with balancing is supported. The charger also supports charging of one Li-ion battery. It is automatically detected whether Li-ion battery or supercapacitors are connected. Maximum input charging power is around 15 Watts.

The output voltage converter is based on TPS63020 and the output voltage can be set anywhere between 1.8 to 5.5V. The maximum output power is around 20W Watts.

The UPS is controlled with STM32F072RBT6 micro controller. It is possible to communicate with the micro controller through UART to get the information about voltages, input current and status. It is also planned to connect LCD display for the further development, thus SPI is break-outed together with second UART and I2C for other peripherals.

The first 10 boards are ordered, hoping that the first revision works! 




People who have at least some interest in electronics have surely heard about supercapacitors or ultracapacitors. The biggest selling-point of them is that they have enormous amount of specific power compared to batteries. Supercapacitors have specific power of about 10 - 20 kW/kg, while, for example Li-Ion batteries have specific power of about 0.3 to 1.5 kW/kg.

One of the popular applications of supercapacitors is in hybrid vehicles, specifically in regenerative breaking systems. The ability of the supercapacitor to charge very fast is perfect for this. If we take, for example, Maxwell K2 3000F 3.0V (3.5 Wh) supercapacitor, it can be fully charged in 0.84 seconds if we have 16 kW DC power source. So, it is clear that supercapacitor are the very well fit for the high-power applications.