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m AC voltage stabiliz er based on wavef orm shaping technology m Superior
waveform compensating power m Excellent current capability m Highly
effective interference rejection m Built-in meter allows monitoring of output
power, input/output voltage, and input/output distortion m Elaborate
protection features m Large "Super Ring" toroidal transformer
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Tap into a totally clean source of AC energy, free from distortion and
high-frequency noise. Revolutionary waveform shaping technology
enables highly precise compensation, providing a pure energy source
with 230 V AC ±2% (or 120 V AC ±2%). Connect audio or video
equipment for a drastic improvement in sound and picture quality.
Monitor output power , input/output voltage, and input/output distortion
on the built-in meter.
The Clean Power Supply components from
Accuphase are revolutionary products that remove
noise and impurities from the AC power line and
improve signal quality by continually monitoring
and shaping the power supply waveform. They
have been widely acclaimed for drastically
improving the sound and picture quality of audio
and video equipment. The PS-1200V is a further
upgraded version of the predecessor model PS-
1200. The circuitry has been optimized to fulfill
even higher performance demands, and the power
transformer that forms the heart of the system is
now a high-performance type with even more
muscle. Because the PS-1200V is a high-power
version of the PS-500V, a single unit can deliver
enough power to cover the requirements of almost
any high-quality system.
The PS-1200V uses waveform shaping technology
to turn the power from a regular AC outlet into a
highly pure sine waveform for use as a stable and
Power supply waveform and PS-1200V output waveform
Almost every electrical device used in an household converts the AC
supplied by the outlet into a DC current for powering its internal circuits.
This task is performed by a rectifier. As shown in photograph , the
rectifier load current has a pulse waveform with a large current flowing
momentarily in the vicinity of the voltage peak. This causes a voltage
drop, resulting in clipping of the voltage waveform, as shown in
photograph .
A clipped waveform with a high amount of distortion contains many
unwanted frequency components, or harmonics. When passing through
the PS-1200V, the deformed waveform is restored to its original sine
wave pattern, as shown in photograph .
Frequency spectrum of power line
(photo )
Frequency spectrum of power line
Frequency spectrum of PS-1200V
output (photo )
Photo Current waveform of
rectified load
Photo
V oltage wavef orm of AC
line (distortion approx. 3%)
Photo
PS-1200V output wave-
form (distortion approx. 0.2%)
uncontaminated energy source of A/V components.
T o achie ve this, the PS-1200V constantly monitors
the input voltage waveform and adds or subtracts
exactly the required amount of correction. The
compensation required by this innovative technique
typically is only a fraction of overall power. The
PS-1200V therefore operates with high efficiency
and produces little heat, allowing it to be designed
as a fairly compact and lightweight unit. Since it
contains no oscillators or switching circuitry, the
PS-1200V itself does not act as a source of
spurious high-frequency noise.
AC Voltage Stabilizer Based on Waveform
Shaping Technology
The PS-1200V accepts AC power on the input side,
processes it using internal control circuitry, and
supplies it as clean AC power on the output side.
Most of the AC energy from the input is carried
over to the output. The loss introduced by the PS1200V is very small, since it consists only of the
power required for waveform compensation.
Figure 1 shows a block diagram of the unit. The
signal from the secondary winding S1 of the transformer reaches the adding/subtracting circuit and
appears at the output as output voltage (e0). A part
of the output voltage is routed to the – input of the
waveform comparator for waveform comparison.
The S2 signal from the transformer goes to the reference waveform generating circuit where it becomes the high-precision sine waveform (ei) synchronized to the input frequency of 50/60 Hz. This
sine wave signal is then
routed to the +
input of the
waveform comparator to be
used as a reference signal. By
comparing the
two input signals, a differential component
is extracted.
Based on this
information, the
adding/subtracting circuit
can provide exactly the required amount
of compensation for turning
the output into a
high-precision
sine waveform.
Excellent Current Capability
The power amplifier which performs waveform
compensation is configured as a pure
complementary symmetrical circuit using current
feedback for unsurpassed operational stability . The
output stage uses transistors rated for a maximum
current of 15 amperes. These devices are
connected in a 20-parallel complementary pushpull arrangement which boasts excellent current
capability.
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Superior Waveform Compensating Power
When the input voltage is 220 V (110 V), the voltage
at the secondary side of the transformer will also
be 220 V (110 V). To bring this to 230 V (120 V), 10
volts must be added, as shown in Figure 3 (a).
Conversely, if the input is 240 V (130 V), 10 volts
must be subtracted to yield 230 V (120 V), as sho wn
in Figure 3 (b). In actual operation, the peak value
of 10 V, namely 14.1 V is added or subtracted.
Comparing a precise sine wave synchronized to
the input frequency with the output voltage yields
a compensation waveform which is imposed on
the output voltage. Consequently, for an input
voltage range of 200-253 V AC (108-132 V AC)
and a constant load, the output voltage is kept
constant at 230 V ±2% (120 V ±2%), with a
maximum distortion ratio of 0.3%. These values
demonstrate the outstanding waveform
compensation ability of the PS-1200V.
Note:
The above explanation is for the 230 V AC version
of the PS-1200V. Figures in brackets refer to the
120 V AC version.
Multiple Protection Syste m Assures Total
Operation Safety
When a problem occurs during operation, the
circuit breaker integrated in the power switch
immediately shuts off the power, to protect the unit
and any connected components.
= When input current overload occurs, such as
when the output is short-circuited, the power is
shut off.
> In case of momentary power overload, such as
caused by inrush current when a component is
switched on or when a power amplifier
reproduces a peak passage in the music, a
current limiter becomes active.
? When DC voltage is detected in the output or
when the output voltage exceeds the maximum
rating, the output is switched off to protect
connected components.
@ When the tem-
perature of the
internal heat sink
or power transformer exceeds
110°C, the circuitry is automatically shut down.
Assembly with protection circuitry
n Assembly with 20-parallel push-
pull output transistors, waveform
compensation amplifier for addition/subtraction, comparator for
reference waveform and output
waveform, etc.
n Assembly with reference waveform
generator etc.
(The photograph shows the
230 V AC version.)
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Highly Effective Interference Rejection
The input side of the PS-1200V is equipped with a
line filter for removing any high-frequency noise
components present in the power line, such as
those generated by digital equipment. The primary
and secondary windings of the power transformer
are kept totally separate, and the fully shielded
design shuts out any externally induced noise.
Since the PS-1200V uses the AC feedback
principle, output impedance is extremely low. This
prevents any possibility of mutual interference
between components connected to the outputs of
the PS-1200V.
n FRONT PANEL
(The photograph shows the 230 V AC version.)
Built-in Meter Allows Monitoring of Output Power,
Input/Output Voltage, Input/Output Distortion.
Overload is Indicated by Flashing Meter Illumination.
The meter of the PS-1200V lets the user see at a
glance how much power (V A) the connected equipment is consuming at any given time. This is especially helpful for components such as integrated
amplifiers or power amplifiers whose power consumption differs considerably depending on the
volume setting and
actual music signal. When the
maximum output
power rating is exceeded, the meter
illumination flashes
as a warning indication.
Assembly with input voltage/distortion monitoring circuitry
Meter of 120 V
AC version
Strong Power Supply With Large "Super Ring"
Toroidal Transformer and High Filtering
Capacity
The power transformer plays a vital role in any
power supply. The PS-1200V uses a large toroidal
type rated for 1500 V A. T oroidal power transf ormers
have large-gauge copper wiring on a donut-shaped
core, resulting in very low impedance and high
efficiency.
★
Output connectors of
120 V AC version
★
n REAR PANEL
(The photograph shows the 230 V AC
version.)
The usable power supply
voltages are indicated.
Power switch/circuit protector
Meter (Output power, input/output voltage,
input/output distortion)
! Meter operation selector
VOL T-AMPERE VOL TAGE INPUT/OUTPUT
DISTORTION INPUT/OUTPUT
Remark
★The 230 V AC and 120 V AC versions of the PS-1200V differ regarding meter voltage indication, AC
output connector shape, supplied power cord, etc. Make sure that you have the correct version.
R
Caution
Supplied accessories: • AC power cord
★
★
The PS-1200V is available in 230 V A C and 120 V A C versions. The actual allowable voltage is indicated next to the A C power connectors
on the rear panel. Be sure to check this indication before using the PS-1200V.
★
This product can be used only on a regular household AC circuit rated for 230 V or 120 V AC , 50/60 Hz. Using the product with portable
AC generators, airplane or ship power generators or other types of power sources is not possible.
★
This product is designed to improve the quality of AC power supplied to audio or video components . Do not use it to po wer industrial type
equipment or common household electrical appliances.
★
Do not use this unit for powering equipment where failure incurs a risk of injury or fatal accidents (medical equipment, aviation equipment,
traffic control equipment, furnace and heating control equipment, safety devices, etc.)
Accupahse will not be liable for any problem occurring due to use of the PS-1200V with the above type of equipment.
★
"# Output connectors (AC outlets)
$ AC power connector
(for supplied power cord)
Output
connectors of
120 V AC version
★
★
The power consumption of electrical equipment, as indicated on the equipment itself and in catalogs
Power Meter Indication and Load
and other documentation, is usually given in watts (W). This figure represents the so-called eff ective
power which is stated according to legal requirements. However, the actual power drawn by the
equipment is larger than the effective power . This is called the apparent power which is calculated
by multiplying the applied voltage (230 V or 120 V) with the actual current. The unit for apparent
power is VA (volt-ampere).
Since the value shown by the power meter of the PS-1200V in the "V OLT-AMPERE" position is the
apparent power, the reading will be higher than the power consumption (W) giv en in catalogs and
specification sheets.
m The rated power limit of the PS-1200V is 1200 VA for the 230 V AC version and 1000 VA for the 120
V AC version. When deciding on equipment to be connected, power consumption figures given in
catalogs and the like can be used for a general estimate, but actual power consumption should be
checked using the meter.
m The power consumption of integrated amplifiers and power amplifiers varies considerably depending
on the actual audio output. After connecting such equipment, perform playback and v erify that power
consumption does not exceed the maximum rating when peaks in the music are reproduced at high
volume levels.
m In case of overload, the meter illumination flashes. Reduce the load by reducing the number of
connected components until the illumination stops flashing and stays constantly lit.
PS-1200V Guaranteed Specifications
230 V version 120 V ver sion
Rated output capacity 1200 VA (continuous) 1000 VA (continuous)
Rated output voltage 230 V AC ±4.6 V 120 V AC ±2.4 V
Rated output current 5.2 A 8.3 A
Output frequency 50 Hz or 60 Hz (identical to input frequency)
Instantaneous peak current capacity 60 A 120 A
Output waveform THD 0.3% or less
Rated input voltage 230 V AC 120 V AC
Input frequency 50 Hz or 60 Hz
No-load power consumption 60 W
Cooling principle Natural air cooling
Meter
.............................................................................................................................................................................................
★
VOLT-AMPERE
.............................................................................................................................................................................................
VOLTAGE INPUT/OUTPUT
(green zone of scale)
.............................................................................................................................................................................................
DISTORTION INPUT/OUTPUT 0 – 6%
Dimensions 475 mm (18-11/16”) width,
Weight 38.4 kg (84.7 lbs.) net
The meter illumination flashes when an overload occurs
230 V AC ±5% 120 V AC ±5%
0 – 1200 VA
242 mm (9-1/2”) height,
508 mm (20”) depth
48 kg (105.8 lbs.) in shipping carton
ÛSpecifications and design subject to change without notice for improvements.
http://www.accuphase.com/
PRINTED IN JAPAN F015Y 851-0108-00 (AD1)
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