Accuphase PS 500 V Brochure

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Accuphase PS 500 V Brochure

Extracted text from Accuphase PS 500 V Brochure (Ocr-read)


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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 120 V AC ± 2% (or 230 V AC ± 2%). Audio or video equipment with a total power consumption of up to 510 VA can be connected, for a drastic improvement in sound and picture quality. Monitoring of output power, input/output voltage, and input/ output distortion is possible. The PS-500V is a revolutionary product which removes the noise components from the AC power line and improves signal quality by continually monitoring and shaping the power supply waveform. As a result, sound and picture quality of audio and video equipment is drastically improved. The AC power lines in ordinary homes as well as in office buildings or recording studios invariably suffer from high amounts of noise and waveform distortion. The ideal wavefor m of the power supply is sinusoidal, but when various electrical devices are connected to the same power source, unwanted voltage fluctuations will occur. In addition, appliances containing digital circuits, such as computers or telephones, emit high- frequency noise components that can enter audio or video components via the power supply and severely affect sound or picture quality by causing intermodulation noise and distor tion. Only when such noise interference is removed and totally clean power is supplied are audio and video components able to develop their full potential. This is especially true for high-end equipment. Consequently, upgrading the quality of the AC power source is bound to result in a drastic improvement in the overall performance of your audio/video system. The PS-500V constantly monitors the input voltage waveform and adds or subtracts exactly the required amount of compensation to achieve a perfectly regular, sinusoidal waveform. The compensation required by this innovative technique typically is only a fraction of overall power. The PS-500V therefore operates with high efficiency and produces little heat, allowing it to be designed as a fairly compact and lightweight unit. Because the output impedance of its AC outlets is extremely low, any combination of components with a total power consumption of 510 VA maximum can be connected. Since it contains no oscillators or switching circuitry, the PS-500V itself does not act as a source of spurious high-frequency noise. AC Voltage Stabilizer Based on Waveform Shaping Technology The PS-500V 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-500V is very small, since it consists only of the power required for waveform compensation. Compared to conventional AC voltage stabilizers, efficiency is much higher and excess thermal energy is low, allowing the unit to be made relatively small and lightweight. Since the power supply frequency is synchronized to the input, an inter nal oscillator is not required. Therefore the unititself does not generate any high-frequency noise. Figure 1 shows a block diagram of the unit. The signal from the secondary winding S 1 of the transformer reaches the adding/sub- tracting circuit and appears at the output as output voltage (e 0). A par t of the output voltage is routed to the - input of the wavefor m comparator for wavefor m comparison. The S2 signal from the transformer goes to the reference waveform generating circuit where it becomes the high-precision sine waveform (e i) 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 the 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 wavefor m. Almost every electrical device used in an household converts the AC supplied by the outlet into 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 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-500V, the deformed waveform is restored to its original sine wave pattern, as shown in photograph . Power supply waveform and PS-500V output waveform Photo Current waveform of rectified load Photo Voltage waveform of AC line (distortion approx. 3%) Photo PS-500V output waveform (distor tion approx. 0.2%) Frequency spectrum of power line (photo )Frequency spectrum of PS-500V output (photo ) Frequency spectrum of power line

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Superior Waveform Compensating Power When the input voltage is 110 V (220 V), the voltage at the secondar y side of the transformer will also be 110 V (220 V). To bring this to 120 V (230 V), 10 volts must be added, as shown in Figure 3 (a). Conversely, if the input is 130 V (240 V), 10 volts must be subtracted to yield 120 V (230 V), as shown 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 108-132 V AC (200-253 V AC) and a constant load of 510 W, the output voltage is kept constant at 120 V ±2% (230 V ±2%), with a maximum distor tion ratio of 0.3%. These values demonstrate the outstanding waveform compensation ability of the PS-500V. Note: The above explanation is for the 120 V AC version of the PS-500V. Figures in brackets refer to the 230 V AC version. Highly Effective Interference Rejection The input side of the PS-500V is equipped with a line filter forremoving 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 PS-500V 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-500V. 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-500V 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. The maximum output power rating of the unit is 510 VA. When this is exceeded, the meter illumination flashes as a warning indication. Excellent Current Capability The power amplifier which performs waveform compensation is configured as a pure complementary symmetrical circuit using current feedback forunsurpassed operation stability. The output stage uses transistors rated for a maximum current of 10 amperes. These devices are connected in a 10-parallel complementary push-pull arrange- ment, which boasts excellent current capability. Elaborate Protection Features Assure 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. Assembly with protection circuitry Assembly with output stage with 10- parallel push-pull multi-emitter devices mounted to large heat sink, waveform compensation amplifier for addition/ subtraction, comparator for reference waveform and output waveform, deviation detector, etc. Assembly with input voltage/ distortion monitoring circuitry