Design and comparison based on TPS61022 + supercapacitor wireless module standby power scheme design

Output voltage design There are two output voltages, one is the voltage (V1) supplied to the wireless module when the main power is supplied; the other is the output voltage of the TPS61022 when the main power is powered down. In order to ensure that the TPS61022 enters the PFM, the TPS61022 is turned off. Need to meet the formula At the same time, it is also necessary to consider V1, V2 to meet the supply voltage range of the wireless module and the overshoot and fall when the dynamic response is required. Therefore, in this design, select V1 = 4V, V2 = 3.6V. The output voltage of the TPS61022 is set by a partial voltage network of the FB pin. When the circuit is stable, the voltage of the FB pin is equal to the reference voltage (VREF). Therefore, the formula that can be satisfied by the voltage dividing resistance is: In order to ensure a better circuit accuracy, it is recommended that the value of R2 is 300kΩ, which ensures that the current flowing through R2 is 100 times greater than the FB pin current. Select in this design, R2 = 100kΩ, R1 = 500kΩ. Two different wireless modules standby power schemes By comparing two different wireless modules backup power schemes, it can be seen that the program is less costly than two supercapacitances in the two supercapacitance, approximately 48%. At the same time, the life of the capacitor increases by 20 to 50%, and the efficiency of the whole machine has also increased by about 5 to 15%.

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