● AC voltage stabilizer based on waveform shaping technology ● Supplies up
to 510 VA of extremely clean energy ● Low-distortion reference waveformgenerator ● Highly effective waveform compensation ● Outstanding current
capability ● Superb interference rejection ● Built-in meter for monitoring fivevital 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 fromAccuphase are revolutionary products thatremove noise and impurities from the AC powerline and improve signal quality by continuallymonitoring 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 thatincorporates 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.

Power Supply Waveform and Clean PS-510 Output Waveform
Almost all electrical devices used in a household convert the AC suppliedby 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 inthe 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 ofdistortion contains many unwanted frequency components, or harmonics,
as shown below. When entering the audio circuitry of an amplifier throughthe power supply, such harmonic components can interfere with the audio
signal and cause intermodulation distortion which has a highly detrimental
effect on sound quality.

The PS-510 uses waveform shaping technology
to turn the power from a regular AC outlet intoa highly pure sine waveform for use as a stableand uncontaminated energy source of A/Vcomponents. To achieve this, the PS-510 takes
the power source waveform and compares it toa highly accurate and stable reference
waveform. Based on this comparison, it thenadds or subtracts exactly the required amountof correction. The compensation required bythis innovative technique typically is only afraction 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 asource of spurious high-frequency noise.

When passing through the PS-510, the deformed waveform is restored toits original sine wave pattern (see frequency spectrum in the graph below).
The result is a clean sine waveform as shown in photograph c.

50Hz

50Hz

-25.0

-25.0

-50.0

-50.0

-75.0

-75.0

-100.00-100.0
0

10k

20k
[Hz]

10k

Frequency spectrum of power line

where it becomes a high-precision sine waveform (ei)synchronized to the input frequency of 50/60 Hz.
This reference sine wave (ei) is then used as reference signal to be compared to the output voltage.
THD[%]

Load: purely resistive

20k
[Hz]

Frequency spectrum of PS-510 output(photo c)Frequency spectrum of power line (photo b)

The PS-510 accepts AC power on the input side,processes it using internal control circuitry,Effi- Input
power
and supplies it as clean AC power on the ciency[%] [VA]
80 800output side. Most of the AC energy from the
input is carried over to the output. The loss
60 600introduced by the PS-510 is very small,since it consists only of the power required
40 400for waveform compensation.

Photo c PS-510 output waveform(distortion approx. 0.2%)

The differential component is extracted and used by
the adding/subtracting circuit to provide exactly therequired amount of compensation for turning the output into a high-precision sine waveform.
Highly Effective Interference Rejection

Load: purely resistive

0.8
Efficiency

0.6

0.4

Input/output power

20 2000Photo b Voltage waveform of AC line
(distortion approx. 3%)

[dB]
0.0

[dB]
0.0

AC Voltage Stabilizer Based on Waveform Shaping
Technology

As shown in Figure 1, the signal from thesecondary winding S 1 of the transformer
reaches the adding/subtracting circuit andappears at the output as output voltage(e0). The S2 signal from the transformer goesto the reference waveform generating circuit

Photo a Current waveform of rectified load

0.2

100

200

300

400

0

500

100

200

300

400

500

Output power [VA]

Output power [VA]

Output power/input power (efficiency)
characteristics

Output power/THD characteristics

Fig. 2 PS-510 Load Characteristics

Meter selector
buttons

Alarm indication
circuit

Adding/subtracting circuit

Meter

AC
OUTPUTS

RectifierLine filter

Reference signal
generator

Error
detector

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 andsecondary windings of the power transformer are
kept totally separate, and the fully shielded design
shuts out any externally induced noise. Since theamplifier 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 especiallyhelpful for components such as integrated amplifiersor power amplifiers whose power consumption differs
considerably depending on the volume setting andactual music signal. When the maximum rated output
power of 510 VA is exceeded, the meter illumination
flashes as a warning indication.

Waveformcomparator Waveform compensation
amplifier using "MCS+"
and "Current feedback"circuitryFig. 1 Operation Block Diagram of PS-510
Meter of 230 V AC version

Assembly with input voltage/
distortion monitoring circuitry

The photograph shows
the 230 V version.

▼ Assembly with 10 parallel push-pull
power transistors mounted to twolarge heat sinks, waveformcompensation amplifier for
addition/subtraction, etc.

Excellent Current Capability
The power amplifier which performs waveform compensation uses the current feedback principle
for excellent high-frequency phase characteristics and operation stability. This is combined with
the MCS+ circuit renowned for superior performance and sound quality. The output stage uses
10 transistors rated for a maximum current of 15 amperes. These devices are connected in aparallel complementary push-pull arrangement which boasts a rated output current of
2.2 A (4.2 A) and an instantaneous peak current (inrush current) rating of 30 A (60 A). This
demonstrates the excellent current capability of the PS-510.
Note: The explanation is for the 230 V AC version of the PS-510. Figures in brackets refer to the 120 V AC version.

Compensation Amplifier Based on High-Precision Reference Signal Creates Pure 230 V (or 120 V) AC Source■ Low-Distortion Reference Signal Generator
The waveform of the signal detected at the S2 winding of the power transformer (seeFig. 1) is used by a highly precise Zener diode circuit to generate a square waveform.
A newly developed 50/60 Hz bandpass filter and band-eliminate filter is then applied
to the waveform. The filter
frequency is switched in sync with
the input frequency, for automatic
50 Hz and 60 Hz support. By routing
the signal through anotherbandpass filter, a low-distortion
sine wave (reference signal) is
created that is not dependent on
the input voltage.
■ Assembly with reference signal generator and other circuitry■ 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 (a).
Conversely, if the input is 240 V (130 V), 10 volts must be subtracted to yield 230 V (120 V), as shownin Figure (b). (As the figures show, in actual operation, the peak value of 10 V, namely 14.1 V, is addedor subtracted.) The sine wave (ei) synchronized to the input frequency and the output voltage (e0) arecompared, and for any excessive or missing component, a compensation waveform up to a maximumof ±10 V (peak value±14.1 V) is generated
and imposed on the
output voltage. Con-

PS-510230/120 V AC
output waveform

+170/
325 V

sequently, for an input
voltage range of 200-

14.1 V+170/
325 V

14.1 V

220/110 V
AC input
waveformt00240/130 V
AC input
waveform
PS-510230/120 V
AC output
waveformt

253 V AC (108-132 V
AC) at the rated loadof 510 VA , the output

14.1 V

-170/
325 V

-170/
325 V

14.1 V

voltage is kept con[50Hz]

From
secondarywinding of
power
transformer

Bandpass
filterBandeliminate
filter(120 V ±2 %), with aBandpass
filterSquare wave
generator[60Hz]

Bandpass
filterBandeliminate
filtermaximum distortion
Reference
outputwaveform

Compensation
waveform+14.1 V+14.1 Vt0
-14.1 V0
-14.1 Vratio of 0.22%. These
values demonstrate
the outstanding wave-

Reference Signal Generator Block Diagram

Compensation
waveform

stant at 230 V ±2%

form compensation
ability of the PS-510.

(a) If power source voltage islower than 230 V (120 V),
addition is performed(b) If power source voltage ishigher than 230 V (120 V),
subtraction is performed

Waveform Shaping Principle of PS-510t

Multiple Protection Assures Total Operation Safety
If a problem occurs during operation, the circuit breaker immediately shuts off
the power, to protect the unit and any connected components
from possible damage.

a When the combined load of connected
equipment exceeds the maximum rated
output power of 510 VA, the meter illumination flashes as a warning indication.

e When the temperature of the internal heat sink or powertransformer is very high for an extended period, the circuitry is automatically shut down.

Gold-plated parts

Strong Power Supply With Large “Super Ring” Toroidal
Transformer and Two High-Quality 22,000 µF Filtering
Capacitorsb When input current overload occurs, thecircuit protector shuts off the power. Reduce the connected load and turn poweron again.
c In case of momentary power
overload such as caused byinrush current when a component is switched on or when apower amplifier reproduces apeak passage in the music, acurrent limiter becomes active
to ensure safe use.

d When DC voltage is detected in the output due to an
operation problem or when the output voltage exceeds
the maximum rating, the output is switched off to protect
connected components.

Circuit protector

The PS-510 uses a large toroidal type power transformer
rated for about 750 VA. The "Super Ring" toroidal powertransformer has large-gauge copper wiring on a donut-shaped
core, resulting in very low impedance and high efficiency.

High-quality, high-reliability circuit components

PS-510 Meter (Power) Indication and Load
The power consumption of electrical equipment, as indicated on the equipment itself and in catalogs andAssembly with protection circuitry

other documentation according to legal requirements, is usually given in watts (W). This figure represents
the so-called effective power. However, the actual power drawn by the equipment is larger than theMeter of 120 V AC
version■ Front panel

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 meter of the PS-510 is the apparent power, the reading will be higher than
Option board installation example

the power consumption (W) given in catalogs and specification sheets.

(The photograph shows the 230 V version.)● The rated power limit of the PS-510 is 510 VA. When deciding on equipment to be connected, selectcomponents so that the total remains within this limit, and check actual power consumption using themeter.
● High-output class-A power amplifiers, such as the A-60 or A-50V, which constantly draw a high idlingcurrent when switched on cannot be connected to the PS-510.
● In case of overload, the meter illumination flashes. Reduce the load by reducing the number ofconnected components until the illumination stops flashing and stays constantly lit.
● The power consumption of integrated amplifiers and power amplifiers varies considerably dependingon the actual audio output. After connecting such equipment, perform playback and verify that power
consumption does not exceed the maximum rating when peaks in the music are reproduced at highvolume levels.

GUARANTEED SPECIFICATIONS
Output connectors of 120 V AC version

120 V version
Rated output capacity■ Rear panel★

230 V version

510 VA (continuous)

Rated output voltage

120 V AC ±2.4 V

230 V AC ±4.6 V

Rated output current

4.2 A

2.2 A

Instantaneous peak current capacity

60 A

30 A

(The photograph shows the 230 V version.)

Output frequency

50 Hz or 60 Hz (identical to input frequency)

Output waveform THD
Rated input voltage

0.22% or less
120 V AC

230 V AC

Input frequency

50 Hz or 60 Hz

No-load power consumption
Cooling principle

55 W
Natural air coolingMeter
The usable power supply
voltage is indicated here.

★
D Output connectors (AC outlets)★
E AC power connector★

A Meter (Output power, input/output voltage, input/
output distortion)★
B Power switch/circuit protector

VOLT-AMPERE
VOLTAGE INPUT/OUTPUT(green zone of scale)
DISTORTION INPUT/OUTPUT

C Meter operation selector buttons
VOLT AMPERE (VA), VOLTAGE INPUT/OUTPUT (V)DISTORTION INPUT/OUTPUT (%)

Remark★ The 230 V AC and 120 V AC versions of the PS-510 differ regarding meter voltage indication, AC
output connector shape, supplied power cord, etc. Make sure that you have the correct version.

0-510 VA
✽ The meter illumination flashes when an overload occurs.
120 V AC ±5%230 V AC ±5%
0-6%

Maximum Dimensions

Width 465 mm (18-5/16")
Height 181 mm (7-1/8")
Depth 386 mm (15-3/16")

Mass

23 kg (50.7 lbs.) net
29 kg (63.9 lbs.) in shipping carton

21

R
Caution

21 120 V AC versions. The actual allowable voltage is indicated next to the AC power connectors on the rear panel. Be sure to check this indication✽ The PS-510 is available in 230 V AC andbefore using the PS-510.
✽ 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 marine power generatorsor 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 power 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.). Accuphase will not be liable for any problem occurring due to use of the PS-510 with the above type of equipment.

■ Supplied accessories:• AC power cord

• Specifications and design subject to change without notice for improvements.

http://www.accuphase.com/

C0505Y PRINTED IN JAPAN 851-0155-00 (AD1)