What is transformerless power supply?
Definition: A transformerless power supply converts high AC input voltage ( 120V or 230V) to the desired output DC low voltage ( 3V or 5V or 12V) with low current output in milliamps. It is used in low power electronic applications like LED bulbs, toys, and household appliances.
What is a 12V DC power supply?
12V power supplies (or 12VDC power supplies) are one of the most common power supplies in use today. Linear regulated 12VDC power supplies regulate the output using a dissipative regulating circuit. They are extremely stable, have very low ripple, and have no switching frequencies to produce EMI.
What is the construction of a Transformerless power supply?
Transformerless Power Supply Construction/Design The construction of this power supply is very simple. It uses a non-polarised capacitor 225k/400v in series with main AC supply voltage and connected with a resistor 470k/1W in parallel to discharge the current (the circuit is switched off) and prevent from shock.
Can a DC transformer be used in a transformerless circuit?
And yes, we can also convert the High voltage AC into Low voltage DC, without using the Transformer, this is called Transformerless power supply. The main component of a Transformerless power supply circuit is Voltage dropping capacitor or X-rated capacitor, which are specially designed for AC mains.
What kind of capacitor is used in Transformerless power supply?
And 1000uF/50v capacitor has been used for Filtration, means removing the ripples in resulted wave. And finally a Zener diode of 6.2v/1w is used as voltage regulator. As we know this circuit provides approx. 12v output (see the table above), so this Zener diode regulate it to approx. 6.2v voltage and flow back the extra current.
How does a transformer convert AC to DC?
It is nothing but converting 220V main AC voltage to 12V DC voltage with the use of the capacitor, resistor, bridge rectifier, and Zener diode. From the above figure, C1 is used as an X-rated capacitor to drop the high AC voltage. The bridge rectifier (D1, D2, D3, D4) converts AC to DC by means of rectification.