Mains AC / DC Converter with SR03x

220V AC To 3.3V DC SchematicThis is another Transformerless power supply.  IC voltage regulators for SR03x made ​​by Supertex is connect directly to main voltage and get the output voltage to 3.3V and 5V chip for SR036 SR037 to 30mA output current. To use this chip is not necessary to use step-down transformer or coil. Rectified input voltage to the diode bridge diodes D1 – D4 (figure point a) is input circuits IC1 SR03x. 220VAC To 3.3VDC WaveformBuilt-in chip comparator controls the power transistor T1 (Figure b): at a voltage above 18 V transistor is turned off and capacitor C1 smooths the output voltage ripple. This voltage is applied to pin 7, where the internal circuit chip performs up to its stabilization or 3.3V to 5V.

Power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.

Tags: 220V AC DC Converter 3.3V power supply 5v power supply Transformerless power supply

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