Supercapacitor backup power supply for E-Meters reference design
PMP30528
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
See the Important Notice and Disclaimer covering reference designs and other TI resources.
Key Document
- Supercapacitor backup power supply for E-Meters reference design
(PDF 1724 KB)
06 Mar 2019
Description
This reference design automatically provides back-up voltages to an E-Meter during a power interruption. While the input voltage is between 10 V to 12 V, two buck controllers (TPS62147, TPS62173) generate 3.9 V at 2 A and 5 V at 150 mA. An optional synchronous boost generates 3.3 V at 50 mA. A discrete charge circuit charges a supercapacitor with a constant current up to an adjustable voltage of 2.7 V. When the input voltage fails, a synchronous boost takes over and boosts the supercap voltage to 3.9 V. The supercap capacitance and voltage defines the energy, which is available for the backup. The design enables a stable backup output of 3.9 V at 200 mA for about 70 s until the output voltage drops.
Features
- Seamless transition between mains power and back-up operation
- Designed to support high output power RF communications such as LTE, NB-IOT, or wireless MBUS or 6LoWPAN
- Single supercapacitor design to minimize system cost
- Discrete constant current supercapacitor charger
- Complete tested design with available design files and test report
See the Important Notice and Disclaimer covering reference designs and other TI resources.
