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参数资料
| 型号： | NCP1631PFCGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/23页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO NCP1631 INTERLEAV PFC |
| 设计资源： | NCP1631PFCGEVB BOM NCP1631PFCGEVB Gerber Files NCP1631PFCGEVB Schematic |
| 标准包装： | 1 |
| 主要目的： | 电源管理，功率因数校正 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | NCP1631 |
| 已供物品： | 板 |
| 其它名称： | NCP1631PFCGEVBOS |
NCP1631
Figure 3. DCM and CRM Operation Within a Sinusoid Cycle for One Branch
I in + 1
V in
t 1 t 1 ) t 2
2 L
T sw
t 1 (t 1 ) t 2 )
T sw
t 1 (t 1 ) t 2 )
T sw
C t V TON
t 1 +
I t
V TON (t 1 ) t 2 )
T sw
NCP1631 On ? time Modulation
Let’s study the ac line current absorbed by one phase of
the interleaved PFC converter.
The current waveform of the inductor (L) during one
switching period (T sw ) is portrayed by Figure 5.
The ac line current is the averaged value of the coil
current as the result of the EMI filter “polishing” action.
Hence, the line current produced by one of the phase is:
(eq. 1)
Where (T sw = t 1 + t 2 + t 3 ) is the switching period and V in
is the ac line rectified voltage.
Equation 1 shows that I in is proportional to V in if
is a constant.
Forcing
constant is what the NCP1631 does to perform FCCrM
operation that is, to operate in discontinuous or critical
conduction mode according to the conditions, without
degradation of the power factor.
The NCP1631 operates in voltage mode. As portrayed by
Figure 6, the MOSFET on time t 1 is controlled by the signal
V ton generated by the regulation block as follows:
(eq. 2)
Where:
? C t is the internal timing capacitor
? I t is the internal current source for the timing capacitor.
The I t charge current is constant for a given resistor
placed on the R t pin. C t is also a constant. Hence, the
condition
t 1 (t 1 ) t 2 )
T sw
to be a constant for proper power factor correction can be
changed into:
is constant.
The output of the regulation block (V CONTROL ) is
linearly changed into a signal (V REGUL ) varying between
0 and 1.66 V. (V REGUL ) is the voltage that is injected into
the PWM section to modulate the MOSFET duty ? cycle.
However, the NCP1631 inserts some circuitry that
processes (V REGUL ) to form the signal (V TON ) that is used
in the PWM section instead of (V REGUL ) (see Figure 7).
(V TON ) is modulated in response to the dead ? time sensed
during the precedent current cycles, that is, for a proper
shaping of the ac line current. This modulation leads to:
Figure 4. Boost Converter
V TON +
T sw V REGUL
t 1 ) t 2
or: V TON
t 1 ) t 2
T sw
+ V REGUL (eq. 3)
Substitution of Equation 3 into Equation 2 leads to the
following on ? time expression:
t 1 +
C t
T sw V REGUL
t 1 ) t 2
I t
(eq. 4)
Replacing “t 1 ” by its expression of Equation 4,
Equation 1 simplifies as follows:
Figure 5. Inductor Current in DCM
I in(phase1) + I in(phase2) +
V in C t V REGUL
2L I t
(eq. 5)
http://onsemi.com
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