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डेटा पत्रक - Design of Power Factor Correction Circuit Using Greenline Compact Power Factor Controller - ON Semiconductor

भाग संख्या AND8016
समारोह Design of Power Factor Correction Circuit Using Greenline Compact Power Factor Controller
मैन्युफैक्चरर्स ON Semiconductor 
लोगो ON Semiconductor लोगो 
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AND8016 pdf
AND8016/D
eliminates boost rectifier reverse recovery loss as MOSFET
cannot turn–on until the inductor current reaches zero.
Secondly, since there are no dead–time gaps between
cycles, the ac line current is continuous thus limiting the
peak switch to twice the average input current. The
converter works right on critical conduction mode, which
results in variable frequency operation.
Inductor Waveform
V
L
+
di
dt
(1)
Equation (1) is the center of the operation of PFC boost
converter where V=Vin(t), the instantaneous voltage across
the inductor. Assuming the inductance and the on–time over
each line half–cycle are constant, di is actually the peak
current, ILpk, this is because the inductor always begins
charging at zero current.
Vin(t)
Vinpk
ILpk IL(t)
Iinpk Iin(t)
ON
MOSFET
OFF
Figure 2. Inductor Waveform
Design Criteria
The basic design specification concerns the following:
Mains Voltage Range: Vac(LL) – Vac(HL)
Regulated DC Output Voltage: Vo
Rated Output Power: Po
Expected Efficiency, h
PFC Power Section Design
Instantaneous Input Voltage, Vin(t)
Peak Input Voltage, Vinpk
Both Vin(t) and Vinpk are related by below equation
Vin(t) + Vinpksin(ωt)
where Vinpk + Ǹ2 Vinrms
Instantaneous Input Current, Iin(t)
Peak Input Current, Iinpk,
Both Iin(t) and Iinpk are related by below equation
Iin(t) + Iinpk sin(ωt),
(2)
(3)
(4)
where Iinpk + Ǹ2 Iinrms
(5)
Input power of the PFC circuit, Pin can be expressed in
following equation, by substituting equation (3) and (5).
@Pin
+ Vinrms Iinrms
+
Vinpk
Ǹ2
Iinpk
Ǹ2
+
Vinpk Iinpk
2
(6)
The output power, Po is given by:
Po + VoIo + ηPin
(7)
PFC circuit efficiency is needed in the design equation, for
low line operation, it is typically set at 92% while 95% for
high line operation. Substituting equation (6) into
equation (7),
Po
+
ηPin
+η
Vinpk Iinpk
2
Express the above equation in term of Iinpk,
Iinpk
+
2Po
ηVinpk
+
Ǹ2 Po
ηVinrms
(8)
(9)
The average input current is equal to average inductor
current, IL(avg),
IL(avg) + Iin
(10)
It has been understood that peak inductor current, ILpk is
exactly twice the average inductor current, IL(avg) for critical
conduction operation.
ILpk
+
2IL(avg)
+
2 Ǹ2 Po
ηVinrms
(11)
Since ILpk is maximum at minimum required ac line
voltage, Vac(LL),
ILpk
+
2 Ǹ2 Po
ηVac(LL)
(12)
Switching Time
In theory, the on–time, t(on) is constant. In practice, t(on)
tends to increase at the ac line zero crossings due to the
charge on output capacitor Cout. Let Vac = Vac(LL) for initial
t(on) and t(off) calculations.
On–time
By solving inductor equation (1), on–time required to
charge the inductor to the correct peak current is:
t(on)
+
ILpk
LP
Vinpk
(13)
Substituting equation (3) and (12) into equation (13),
results in:
@t(on)
+
2 Ǹ2 Po
ηVac(LL)
LP
Ǹ2 Vac(LL)
+
2Po LP
ηV2ac(LL)
(14)
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भाग संख्याविवरणविनिर्माण
AND8016Design of Power Factor Correction Circuit Using Greenline Compact Power Factor ControllerON Semiconductor
ON Semiconductor
AND8016DDesign of Power Factor Correction Circuit Using Greenline Compact Power Factor ControllerON Semiconductor
ON Semiconductor


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