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AND8016 반도체 회로 부품 판매점

Design of Power Factor Correction Circuit Using Greenline Compact Power Factor Controller



ON Semiconductor 로고
ON Semiconductor
AND8016 데이터시트, 핀배열, 회로
AND8016/D
Design of Power Factor
Correction Circuit Using
GreenlineCompact Power
Factor Controller MC33260
http://onsemi.com
Prepared by
Ming Hian Chew
ON Semiconductor Analog Applications Engineering
APPLICATION NOTE
Introduction
of external components, the MC33260 can control the
The MC33260 is an active power factor controller that follower boost operation that is an innovative mode
functions as a boost pre–converter which, meeting allowing a drastic size reduction of both the inductor and the
international standard requirement in electronic ballast and power switch. Ultimately, the solution system cost is
off–line power supply application. MC33260 is designed to significantly lowered.
drive a free running frequency discontinuous mode, it can
Also able to function in a traditional way (constant output
also be synchronized and in any case, it features very voltage regulation level), any intermediary solutions can be
effective protections that ensure a safe and reliable easily implemented. This flexibility makes it ideal to
operation.
optimally cope with a wide range of applications.
This circuit is also optimized to offer extremely compact
This application note will discuss on the design of power
and cost effective PFC solutions. It does not entail the need factor correction circuit with MC33260 with traditional
of auxiliary winding for zero current detection hence a boost constant output voltage regulation level operation and
simple coil can be used instead of a transformer if the follower boost variable output voltage regulation level
MC33260 Vcc is drawn from the load (please refer to page operation. For derivation of the design equations related to
19 of the data sheet). While it requires a minimum number the IC please refer to MC33260 data sheet.
D1 D3
D2 D4
C1
R6 D5
R7
+
D7 C4
R2
R1
C2
C3
18
27
MC33260
36
45
R3
R5
R4
L1
D5
Q1
+
C5
C6
Figure 1. Application Schematic of MC33260
PFC Techniques
cost. This paper will discuss design of PFC with MC33260,
Many PFC techniques have been proposed, boost which operates in critical conduction mode.
topology, which can operate in continuous and
discontinuous mode, is the most popular. Typically,
continuous mode is more favorable for high power
application for having lower peak current. On the other
hand, for less than 500 W application, discontinuous mode
offers smaller inductor size, minimal parts count and lowest
Discontinuous Conduction Mode Operation
Critical conduction mode operation presents two major
advantages in PFC application. For critical conduction
mode, the inductor current must fall to zero before start the
next cycle. This operation results in higher efficiency and
© Semiconductor Components Industries, LLC, 2002
June, 2002 – Rev. 1
1
Publication Order Number:
AND8016/D
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AND8016 데이터시트, 핀배열, 회로
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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2
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