|
Boost Regulator
| Boost
DC to DC Converter or Step Up regulator,
is a derivation of Buck converter, but in opposite way, instead of
step down this is a step up or boost regulator see Fig 1 and Fig 2 |
| Functionality:
when a square wave is applied to MOSFET gate, energy is stored in
the inductor during MOSFET is ON, then energy is deliberated when
MOSFET is turned OFF and it is stored on the Capacitor via diode D1,
note that diode are in reverse when MOSFET is turned ON and diode is
biased forward when MOSFET is OFF at the mean time the Inductor
delivery the energy pumping current to the capacitor. see Fig 3 |
| The
larger is the inductance, the
higher is the voltage output. R1 and R2 sense the Vo and compare
with Vref. then a PWM signal is generated by The PWM amplifier to
regulate the Voltage output, the size of the inductor and capacitor
are determinates the switching frequency and the power output. |
Advantages/Applications:
In normal
operation the energy is fed from the inductor to the
load, and then stored in output capacitor.
For this reason the output capacitor is
stressed more than in the Buck converter.
Disadvantages:
No
DC isolation between input and output
Output
ripple higher than Linear
Slow
transient response
MOSFET
selection
•Device
selection
•Power
switch
• Vdss
> Vout
• Ids(max)
Iout/1-d + DeltaI/2
•Rectifier
• Vrrm
> Vout
• If(avg)
> I out
|
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