Accuphase PS-500

Commentary

A clean power supply that enables high-quality and stable energy supply through unique waveform shaping technology.

In the PS 500, input AC is added and subtracted by the control circuit to correct the input AC, and then output as AC. The main energy is the input AC itself, and the loss is only the power for waveform correction. Therefore, compared with conventional AC constant voltage devices, high efficiency is achieved. In addition, heat generation is reduced and weight is also reduced.
Since the power supply frequency is input synchronous system, there is no need for an internal oscillator and no generation of high frequency noise from inside.

The PS 500 generates a high-precision sinusoidal waveform synchronized with the input frequency and compares it with the output voltage. A compensation waveform of ± 10 V maximum for the excess or deficiency is generated and the output voltage is added or subtracted.
As a result, an excellent waveform correction capability with a constant output voltage of 100 V (± 2 V) and a distortion rate of 0.3% or less is obtained when a rated load of 500 VA is connected against fluctuations in input voltage from 90 V to 110 V.

A pure complimentary service symmetrical circuit and a current feedback amplifier circuit are used in the power amplifier for waveform correction. A 10 parallel complimentary service push-pull transistor with a maximum rating of 10A is used for this stage. The rated output current is 5A and the instantaneous current supplying capacity is 70A.

The input side is equipped with a line filter to eliminate high-frequency noise, which blocks noise components entering through the power supply line.

The power transformer uses a super-ring type large toroidal transformer of approximately 750 VA.
In this super-ring type, since the cross section of the iron core is close to a circle, the coil is also close to a circle and adhesion is improved. This reduces loss and weight, reduces leakage flux during loading, and reduces groaning and vibration. In addition, by reducing the cross section of the iron core and increasing the weight ratio of the copper wire, iron loss and inrush current are kept low.
In addition, external noise is eliminated by complete shielding.

By adopting an AC feedback system, the output impedance is kept very low, and interference between devices connected to the output is eliminated.

Equipped with a meter, the power consumption of connected equipment can be checked. In addition, the power supply input / output voltage and input / output distortion factor can be monitored with the meter changeover switch in the mounted operation state.
The wattage of this meter indicates the apparent power (VA value) and indicates a value larger than the power consumption value shown in the catalog.

Equipped with a circuit protector that also serves as a power switch. In the unlikely event that an error occurs, the power supply is cut off to protect the PS 500 and connected devices.
This protection circuit operates when the total power consumption of the load devices connected to the output terminals exceeds 500 VA or more and the rated input voltage exceeds 7.5A. It also operates when the output terminals are short-circuited.
In addition, it can be used safely with 70A current limiter for instantaneous power over such as inrush current when the power is ON.
The protection circuit operates even when DC current is output due to PS 500 error or when AC108V or more is output.

The output terminal is equipped with 5 AC outlets.

Model Rating

Type	Clean power supply
Rated output capacity	500 VA (continuous output)
Rated output voltage	100 VAC ± 2 V
Rated output current	5A
Output frequency	50Hz/60Hz (synchronized with input frequency)
Instantaneous current supply capability	70A
Output waveform total harmonic distortion factor	0.3% or less
Input voltage range	90 VAC ~ 110 V
Input autumn KARAS h number	50Hz/60Hz
Input capacity	750 VA (at rated output)
Power consumption at no load	55W
Cooling system	Natural air cooling
Meter	Wattage : 0 to 500W Voltage input/output : 90 ~ 110 VAC Red range of scale : 100 VAC + / - 5 V Distortion input/output : 0 to 6%
Maximum external dimensions	Width 475x Height 180x Depth 378.5 mm
Weight	21.8kg