Accuphase PS-1200

Commentary

Clean power source announced as a large power type of PS 500.

The PS 1200 is designed to compensate for input AC by adding and subtracting the input AC with a control circuit, and output as AC. The main energy is the input AC itself, and the loss is only the power for waveform compensation. Therefore, compared with conventional AC constant voltage devices, it achieves higher efficiency. It also generates less heat and is lighter.
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 1200 generates a high-precision sinusoidal waveform synchronized with the input frequency and compares it with the output voltage. It also generates a correction waveform of up to ± 10 v, and adds or subtracts the output voltage. As a result, when the input voltage varies from 90 v to 110 v, the output voltage is constant at 100 v (± 2 v) and the distortion rate is 0.3% or less when the rated load is connected to 1,200 va.

A pure complimentary service symmetrical circuit and a current feedback amplifier circuit are used in the power amplifier for waveform correction. This stage uses 20 parallel complimentary service push-pull transistors with a maximum rating of 15A. The rated output current is 12A and the instantaneous current capability is 140A.

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 1,500 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, it shuts off the power supply and protects the PS 1200 and connected devices in the unlikely event of an error.
This protection circuit operates when the total power consumption of the load devices connected to the output terminals exceeds 1,200 VA or more and the rated input voltage exceeds 20A. It also operates when the output terminals are short-circuited.
In addition, it can be used safely because the current limiter is applied at 140A in case of 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 1200 error.

A total of seven AC outlets are installed on the front and rear panel sides of the output terminal.

Model Rating

Type	Clean power supply
Rated output capacity	1,200 VA (continuous output)
Rated output voltage	100 VAC ± 2 V
Rated output current	12A
Output frequency	50Hz/60Hz (synchronized with input frequency)
Instantaneous current supply capability	140A
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	1,500 VA (at rated output)
Power consumption at no load	60W
Cooling system	Natural air cooling
Meter	Wattage : 0 to 1,200W 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 242x Depth 508 mm
Weight	37.2kg