Прочие устройства — Accuphase PS-550 230 V

This is the 230 V build of the Accuphase PS-550 Clean Power Supply, intended for European and other 230 V mains. Accuphase makes the unit in 230 V and 120 V versions that differ in the voltage shown on the meters, the shape of the AC output connectors and the supplied power cord, so buyers need the build that matches their local grid. The PS-550 compares the incoming mains with a reference sine wave, fills in what is missing and removes the excess, and shows the result on its own waveform display.

Key specs that matter

Continuous rated capacity is 400 VA. The 230 V version accepts 230 V plus or minus 10% at 50 Hz or 60 Hz, holds its output at 230 V within 3.0 V and delivers a rated output current of 1.8 A, with output frequency following the input. Output waveform distortion is 0.08% or less. Idle consumption with no load connected is 43 W, and cooling relies on natural air flow. This build is 465 mm wide, 181 mm high and 396 mm deep, weighs 24.0 kg net, and six AC output terminals sit on its rear panel.

Engineering and use context

Noise is removed in three stages. A line filter first takes out interference from digital devices, a shielded toroidal power transformer then eliminates common mode noise, and a waveform correction amplifier finally shapes the output. To build the reference, the circuit detects the zero-cross point of the mains, turns it into a square wave and cleans that wave with two stages of band pass filtering followed by six stages of band elimination filtering. According to Accuphase, third-order harmonics fall from minus 40 dB at the input to minus 80 dB at the output. Because the waveform is shaped as AC without conversion to DC and no oscillator is involved, efficiency stays high and there is no source of high-frequency noise. The correction amplifier uses a 10-parallel push-pull output stage fed by two 22,000 uF/90 V filter capacitors, and protection circuitry guards the unit and every connected component. Selector buttons switch the display between output power in VA, voltage and distortion readings for both the incoming and regenerated supply, or the two waveforms, and a separate switch turns the display off.

Pairing

Accuphase sizes connected loads in VA, which for most audio components runs 1.2 to 1.8 times their rating in watts. Total load should stay under the rated capacity with amplifiers at maximum volume, and a selector LED blinks if the draw passes the meter maximum. The unit is meant for audio and video components only, not for household appliances or for use on generators, ship or aircraft power.

Alternatives

The Accuphase PS-1250 is the other Clean Power Supply in the current Accuphase catalogue.