Transcription of POWER SUPPLY DESIGN BASICS - STMicroelectronics
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POWER SUPPLY DESIGN BASICS - STMicroelectronics
APPLICATION NOTEAN253/1088 POWER SUPPLY DESIGN BASICSby P. ANTONIAZZIIn mains-supplied electronic systems the AC inputvoltage must be converted into a DC voltage with theright value and degree of 1 and 2 show the simplest rectifier these basic configurations the peak voltageacross the load is equal to the peak value of the ACvoltage supplied by the transformer s secondarywinding. For most applications the output ripple pro-duced by these circuits is too high. However, forsome applications - driving small motors or lamps,for example - they are a filter capacitor is added after the rectifier diodesthe output voltage waveform is improved consider-ably. Figures 3 and 4 show two classic circuits com-monly used to obtain continuous voltages startingfrom an alternating voltage. The Figure 3 circuit usesa center-tapped transformer with two rectifier diodeswhile the Figure 4 circuit uses a simple transformerand four rectifier 1 : Basic Half Wave Rectifier 2 :Full Wave Rectifier Wich uses a Cen-ter-tapped 3 :Full Wave Rectified Output From theTransformer/rectifier Combination is fil-tered by 4 :This Circuit Performs Identically to thatShown in Figure 5 shows the continuous voltage curve obtai-ned by adding a filter capacitor to the Figure 1 sectio
three-terminal series regulators which provide a very stable output and include current limiter and thermal protection functions. Figures 16, 17 and 18 show how these circuits are used. Refer to the da-tasheets for more information. Figure 11 : Ripple Reduction Produced by a Sin-gle Section Inductance-capacitance Filter.
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