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Aimed at system designers whose interest focusses on other fields, this note reviews the basic power supply design knowhow assumed in the rest of the book.
In mains-supplied electronic systems the AC input
voltage must be converted into a DC voltage with the
right value and degree of stabilization.
Figures 1 and 2 show the simplest rectifier circuits houston homes for sale.
In these basic configurations the peak voltage
across the load is equal to the peak value of the AC
voltage supplied by the transformer’s secondary
winding. For most applications the output ripple produced
by these circuits is too high. However, for
some applications - driving small motors or lamps,
for example - they are satisfactory.
If a filter capacitor is added after the rectifier diodes
the output voltage waveform is improved considerably car finance.
Figures 3 and 4 show two classic circuits commonly
used to obtain continuous voltages starting
from an alternating voltage. The Figure 3 circuit uses
a center-tapped transformer with two rectifier diodes
while the Figure 4 circuit uses a simple transformer
and four rectifier diodes.
Figure 1 : Basic Half Wave Rectifier Circuit.
Figure 2 : Full Wave Rectifier Wich uses a Center-
tapped Transformer bad credit loans.
Figure 3 : Full Wave Rectified Output From the
Transformer/rectifier Combination is filtered
by C1.
Figure 4 : This Circuit Performs Identically to that
Shown in Figure 3.
Figure 5 shows the continuous voltage curve obtained
by adding a filter capacitor to the Figure 1 circuit.
The section b-c is a straight line. During this time it
is the filter capacitor that supplies the load current.
The slope of this line increases as the current increases,
bringing point c lower. Consequently the diode
conduction time (c-d) increases, increasing ripple.
With zero load current the DC output voltage is equal
to the peak value of the rectified AC voltage los angeles mortgage loans.
Figure 6 shows how to obtain positive and negative
outputs referred to a common ground. Useful design
data for this circuit is given in figures 7, 8 and 9. In
particular, the curves shown in Figure 7 are helpful
in determining the voltage ripple for a given load current
and filter capacitor value. The value of the voltage
ripple obtained is directly proportional to the
load current and inversely proportional to the filter
capacitor value.