Backup power circuit design based on TPS61022 boost converter +1 supercapacitor

For the design of the smart meter backup power supply, we recommend the spare power scheme of the single supercapsate plus TPS61022 boost chip, the application block diagram is shown in Figure 1, and the specific circuit diagram is shown in Figure 4. The supercapacitor can be related to the discharge cutoff voltage, the input voltage of the TPS61022 can be low to 0.5V, so that we can utilize the energy of the super capacitor as much as possible. The working principle is when the main circuit is powered, there will be a 4.7V power source to power the wireless module through the diode, at which time the output of TPS61022 is 4V (4.7V minus diode pressure drop 0.7V). Since the working limit of the PFM mode above the TPS61022 is 3.636V (1.01 * 3.6V), the TPS61022 closes the tube and the tube. When the main power is powered, there is no 4.7V supply rail, and when the output voltage of the TPS61022 is reduced to the working limit of the PFM mode 3.636V, the TPS61022 starts working, ensuring that the output voltage is stabilized in the set value of 3.6V. In order to ensure that the spare power scheme can support the wireless module for 1 minute, the desired supercappend value is calculated. Assume that a supercapacitor is discharged from 2.7V to 1.2V. The average output power is 1.2W. At the same time, it is considered that there is a change in +/- 20% capacitance, and a 35F super capacitor can be used. Be Article source network

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