DESIGN OF TRANSFORMER LESS POWER SUPPLY FOR LOW POWER APPLICATION

Santosh K. Verma, Amit Pal

Abstract: Appropriate power supply is the most required parameter for any electronics gadget. We need it for all kind of works related to electronic world (example: you need it if you are working on any project or to power up your designed device). Most of the electronic components work with DC power supply. To power up these components we can use various D.C. sources i.e. battery, AC to DC converter, Rectifier Circuit etc. We can use any of them depending upon our need. But sometimes we may fall in situation that we need only few mA of current at very low voltage and we may not have the option to use costly and bulky AC to DC converter circuit, any battery source or any other power source like DC adapter available in the market (example: you have designed a device and you want to build a separate power supply source for it so that it can operate directly from AC mains) but on the other hand you don’t want to use step down transform in the converter circuit to reduce the size and cost. To solve the issue we have designed a circuit which can be used anywhere to provide power supply for current requirement up to few mA at low voltage. Circuit has very good response to the high voltage surge and spikes even which lasting for few milliseconds. Further circuit is modified from the conventional techniques available across the internet [1] to get the step type voltage response across capacitor at output side to avoid any malfunctioning of connected device.

Keywords: Regulated Power Supply, Transformer less Power Supply, Bridge Rectifier, Low Power Application, A.C. to D.C. converter etc…

DOI: https://doi.org/10.15623/ijret.2015.0404047