Regulated power supply
Efficient power supplies are necessary for providing power to many types of electronic circuits. Power supplies are used in electronic devices to provide power to portions of the device's circuit at specific voltage levels. Regulated power supplies are required where the voltage levels must be tightly controlled for proper operation of the circuit. Power supplies are commonly used to provide DC power for electronic devices from either AC power or DC power at a different voltage. DC power supplies that receive DC power at a different voltage are sometimes known as power converters. Regulation of the DC output voltage refers to limiting changes or swings in the output voltage level. This is particularly important in many applications where small deviations from the design voltage level can affect the operation of the equipment being supported by such power supply. A common type of regulated power supply is a switching power supply, in which regulation is performed by a square wave signal having a duty cycle that changes depending on the voltage to be output. A direct-current regulated power supply is used for driving electronic devices such as a personal computer and a hand phone or electronic circuits with a high degree of precision and in accordance with specifications. A switching DC regulated power supply also referred to as a switching regulator is known as one of direct-current regulated power supplies. Power converters generally apply the DC input power to a switch circuit which is controlled to maintain the output voltage or current at a predetermined value. One of the advantages of using switches to convert the DC input voltage to a DC output voltage is that switches dissipate relatively little power because they are either closed or open. Many power converters also use a transformer having a primary winding connected in series with a switch.
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