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NCP1650
V line
R ac1
AC INPUT
5
R ac2
V ac
POWER
MULTIPLIER
V pm
V ref
C 9
P max
R 9
9
2.5 V
+
--
V pa
POWER
AMP
ORing NET
--0.32 mA/V
REFERENCE
MULTIPLIER
25 k
AC
ERROR
AMP
--
+
4V
--
+
PWM
LOGIC
OUT
16
Q1
C.S. Amp
12
I S--
I O
LOOP COMP
8
R 8
I avg
10
R 10
R S
C 8
POWER MULTIPLIER
POWER AMP
REFERENCE SIGNAL
MODULATOR AND OUTPUT STAGE
Vpm
i o
=
3.75 R9 Vac RS
R10
Av =
Gm
2 π fC
8
Vref
Vpa
= --2 Vac
i o
Vref
=
R10
225k RS
Vac =
R
Vline Rac2
ac1 + Rac2
fz =
1
2 π C8 R8
Vac =
R
Vline Rac2
ac1 + Rac2
fp =
1
2 π C9 R9
Av = Gm R8
(High Frequency Gain, Past Zero)
Figure 45. Power Loop Model
Power Loop
Block Diagram
The block diagram for the power loop has been broken
down into four sections. These are the power multiplier,
power amplifier, reference signal and modulator and output
stage.
Similar to the voltage loop, the modulator and output stage
circuitry has been greatly simplified due to the location of
the associated poles and zeros.
There are two significant poles in this circuit. The first is
on the power multiplier and the second is due to the power
error amplifier. Because the pole on the power multiplier is
very low, it will normally be necessary to include the resistor
(R 8 ) for the zero on this amplifier.
Power Multiplier
The power multiplier ’s gain is a function of the input
voltage. This multiplier has a very low frequency pole that
must be considerably lower than the line frequency, so that
the power signal is essentially a DC level.
Reference Signal
The reference signal block is unchanged from the voltage
loop model.
Modulator and Output Stage
For the power circuit, the transfer function of the
modulator and output circuitry follows the path from the AC
reference voltage (Vref) to the output current. Since this
circuit regulates the power, and the input and output voltages
are the two basic components of the power, the output
current is the output variable for this block.
There is no pole associated with this function.
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