Kikusui PCZ1000A, Руководство по эксплуатации

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A-2
PCZ1000A
A.1 Explanation of Operating Functions
A.1.1 Operating Functions
Operating Range
The operating range of the PCZ1000A is limited by the rated current, rated voltage,
and rated power. The PCZ1000A can only be operated within the range indicated by
the shaded area in the figure below.
Note that rated current flow cannot be achieved, so if the input voltage is less than
20 Vpeak (approximately 14 Vrms), the various specification characteristics will
not be satisfied in this case. Moreover, input-voltage frequency synchronization
cannot be achieved in this case and this may cause an extremely large distortion in
the current waveform.
With a low input voltage, the current waveform distortion becomes large. This
distortion also becomes large for light loads for which the input voltage is high and
the input current is low.
Fig.A-1 Operating Range
Differences Between DC and AC Loads
In general, a constant-current load always maintains current flow at a constant level,
regardless of the applied voltage. DC loads operate in this way in constant-current
mode.
For AC loads, if it operates in the way mentioned above, the current waveform
becomes square (rectangular) regardless of the waveform of the applied voltage,
which differs from a realistic AC load in that the polarity is inverted with the current
kept constant. The PCZ1000A controls the RMS value of the current to ensure that
the load current always has a sinusoidal waveform (except for the crest factor
function). That is, when the voltage is constant and the waveform is sinusoidal, the
PCZ1000A acts as a purely resistive load.
Voltage waveform
Current waveform
3 V
3 V
0
Distortion near the zero
current turn-on point
(crossover distortion)
increases.
Current waveform of which
the input voltage is low
rms value of the input current
rms value of the input voltage
0
14 Vrms
Maximum power 1kw
Maximum
voltage
(280Vrms)
Maximum power
(10 Arms)
3.57 Arms
100 Vrms