Accuphase PS-510 Brochure
● AC voltage stabilizer based on waveform shaping technology ● Supplies up
to 510 VA of extremely clean energy ● Low-distortion reference waveform
generator ● Highly effective waveform compensation ● Outstanding current
capability ● Superb interference rejection ● Built-in meter for monitoring five
vital parameters: output power, input/output voltage, input/output distortion
● Elaborate protection features ● Large “Super Ring” toroidal transformer
The photograph shows the 230 V version.
Tap into a totally clean source of AC energy for up to 510 VA – Revolutionary
waveform shaping technology enables highly precise compensation,
creating a pure energy source of 230 V AC (or 120 V AC) ±2% with max.
0.22% THD. Connect audio or video equipment for a drastic improvement
in sound and picture quality. Monitor output power (VA), input/output
voltage (V), 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-510 is an upgraded version that
incorporates latest MCS+ circuit topology in the
waveform compensation amplifier section. The
reference signal generator features further
improved accuracy to assure the lowest possible
distortion in the output waveform.
The PS-510 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 uncontaminated energy source of A/V
components. To achieve this, the PS-510 takes
the power source waveform and compares it to
a highly accurate and stable reference
waveform. Based on this comparison, it then
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-510 therefore
operates with high efficiency and produces little
heat, allowing it to be designed as a fairly
compact and lightweight unit. Since all circuitry
is analog and there are no oscillators or
switches, the PS-510 itself does not act as a
source of spurious high-frequency noise.
Power Supply Waveform and Clean PS-510 Output Waveform
Almost all electrical devices used in a household convert the AC supplied
by the outlet into a DC current for powering internal circuits. This task is
performed by a rectifier. As shown in photograph a, 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 b. A clipped waveform with a high amount of
distortion contains many unwanted frequency components, or harmonics,
as shown below. When entering the audio circuitry of an amplifier through
the power supply, such harmonic components can interfere with the audio
signal and cause intermodulation distortion which has a highly detrimental
effect on sound quality.
When passing through the PS-510, the deformed waveform is restored to
its original sine wave pattern (see frequency spectrum in the graph below).
The result is a clean sine waveform as shown in photograph c.
[dB]
0.0
50Hz
-25.0
-50.0
-75.0
-100.0
0 10k 20k
Frequency spectrum of power line (photo b)
Frequency spectrum of power line
[dB]
0.0
50Hz
-25.0
-50.0
-75.0
-100.0
0 10k 20k
Frequency spectrum of PS-510 output
(photo c )
Photo a Current waveform of rectified load
Photo b Voltage waveform of AC line
[Hz][Hz]
Photo c PS-510 output waveform
(distortion approx. 3%)
(distortion approx. 0.2%)
AC Voltage Stabilizer Based on Waveform Shaping
Technology
The PS-510 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 PS-510 is very small,
since it consists only of the power required
for waveform compensation.
As shown in Figure 1, the signal from the
secondary winding S
1 of the transformer
ciency
Effi-
Input
power
[%]
[VA]
80
800
60
600
40
400
20
200
reaches the adding/subtracting circuit and
appears at the output as output voltage
0). The S2 signal from the transformer goes
(e
to the reference waveform generating circuit
Line filter
where it becomes a high-precision sine waveform (e
synchronized to the input frequency of 50/60 Hz.
This reference sine wave (e
i) is then used as refer-
ence signal to be compared to the output voltage.
THD
Load: purely resistive Load: purely resistive
Efficiency
Input/output power
0 100 200 300 400 500
Output power/input power (efficiency)
characteristics
Output power [VA]
[%]
0.8
0.6
0.4
0.2
0
100 200 300 400 500
Output power/THD characteristics
Fig. 2 PS-510 Load Characteristics
Meter selector
buttons
Rectifier
Reference signal
generator
Alarm indication
circuit
Adding/sub-
tracting circuit
Wavefo rm
comparator
Error
detector
Waveform compensation
amplifier using "MCS+"
and "Current feedback"
circuitry
Meter
Output power [VA]
AC
OUTPUTS
i)
The differential component is extracted and used by
the adding/subtracting circuit to provide exactly the
required amount of compensation for turning the output into a high-precision sine waveform.
Highly Effective Interference Rejection
The input side of the PS-510 is equipped with a line
filter for removing any high-frequency noise
components present in the power line, such as
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
amplifier uses the feedback principle, output
impedance is extremely low. This prevents any
possibility of mutual interference between components
connected to the outputs of the PS-510.
Built-in Meter Allows Monitoring of 5 Parameters:
Output Power, Input/Output Voltage, Input/Output
Distortion
The meter of the PS-510 lets the user see at a
glance how much power (VA) 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 rated output
power of 510 VA is exceeded, the meter illumination
flashes as a warning indication.
Fig. 1 Operation Block Diagram of PS-510
Meter of 230 V AC version
Assembly with input voltage/
distortion monitoring circuitry
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