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Soldering iron |
DC-DC converter with automatic transfer to standby power supply
The project is a DC-DC converter from 5 V to 4 V with consumer switching in case of disconnection of the main power supply to the backup power supply (e.g. Li-Ion). The maximum current is up to 2 A.
The power supply is controlled by two switching transistors: NPN bipolar Q1 and MOSFET Q2.
The main requirement for the converter is the ability to reduce the input voltage from 5 V to 4 V and stabilize it at the output. Also important is its ability to withstand a passing current of 2 A. The LMS1587CT-ADJ was chosen as the voltage regulator - a positive stabilizer with a low voltage drop and an output load current of 3 A, which sets the output voltage through two connected external resistors.
This circuit guarantees automatic switching from mains operating voltage to battery voltage and vice versa. The advantages of such a system are the independence of switching from the voltage value of the main source and a fairly low energy consumption of the backup in the static quiescent mode. But, the disadvantage is the vulnerability to connecting a backup source without observing the correct polarity, which will cause a breakdown of the transistor Q2.
DC-DC converter with automatic transfer to standby power supply
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- Jose?Maria?Arias Dec 20,2021
- hakan topuz Oct 17,2021
- Monakhov Ilia Oct 07,2021
- Dovan Oct 07,2021
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