Accuphase PS 1210 Brochure

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Accuphase PS 1210 Brochure

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14.1 V 14.1 V +170/ 325 V +14.1 V00 -14.1 V t t 14.1 V 14.1 V +14.1V0 0-14.1V t t [50 Hz] [60 Hz] From secondary winding of power transformerSquare wave generator Bandpass filter Bandpass filterBand-stop filter Band-stop filterBandpass filter Reference output waveform PS-1210 230/120 V AC output waveform 220/120 V AC input waveform Compensation waveformCompensation waveform PS-1210 230/120 V AC output waveform240/130 V AC input waveform -170 / 325 V +170/ 325 V -170/ 325 V Compensation Amplifier Based on High-Precision Reference Signal Creates Pure 230 V (or 120 V) AC Source ■ ■■ ■ ■Low-Distortion Reference Signal GeneratorThe waveform of the signal detected at the S 2 winding of the power transformer (see Fig. 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-stop filter are 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 another bandpass filter, a low-distortion sine wave (reference signal) is created that is not dependent on the input voltage. ■ ■■ ■ ■Superior Waveform Compensating PowerWhen 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 shown in Figure (b). (As the figures show, in actual operation, the peak value of 10 V, namely 14.1 V, is added or subtracted.) The sine wave (e i) synchronized to the input frequency and the output voltage (e o) are compared, and for any excessive or missing component, a compen- sation waveform up to a maximum of ±10 V (peak value ±14.1 V) is gener- ated and imposed on the output voltage. Conse- quently, for an input volt- age range of 200-253 V AC (108-132 V AC) at the rated load of 1200 VA (1000 VA), the output voltage is kept cons tant at 230 V ±2% (120 V ±2 %), with a maximum dis- tortion ratio of 0.22%. These values demon- strate the outstanding waveform compensation ability of the PS-1210. Reference Signal Generator Block Diagram 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 20 transistors rated for a maximum current of 15 amperes. These devices are connected in a parallel complementary push-pull arrangement which boasts a rated output current of 5.2 A (8.3 A) and an instantaneous peak current (inrush current) rating of 60 A (120 A). This demonstrates the excellent current capability of the PS-1210. bAssembly with waveform compensation amplifier for addition/subtraction, output stage with 20 parallel push-pull power transistors mounted to two large heat sinks, waveform compensation amplifier, etc. Note: The explanation is for the 230 V AC version of the PS-1210. Figures in brackets refer to the 120 V AC version. Waveform Shaping Principle of PS-1210 (a) If power source voltage is lower than 230 V (120 V), addition is performed(b) If power source voltage is higher than 230 V (120 V), subtraction is performed The photograph shows the 230 V version. ■ ■ ■ ■ ■ Assembly with reference signal generator and other circuitry