Kikusui PAD-L III Series, Руководство по эксплуатации

Страница: 35 / 132

PAD-L Precautions and Preparations for Use 2-7
operation, allowing you to increase the output voltage further. If the current limit is
increased from 5 A to 9 A in Fig. 2-7, a voltage of up to 90 V can be output.
Next, let's assume a case in which a load resistance of 4
Ω
is used. The output current
limit is regarded as the rated maximum output current. When you increase the output
voltage from 0 V, the output current reaches the power supply's maximum current
rating when the output voltage reaches 40 V; the power supply cannot output a voltage
above 40 V with the maximum current flowing. This is its limit, even though the power
supply is not yet generating half its output capacity in terms of power. If you wish to
increase the output voltage further, another power supply needs to be connected in
parallel to the relevant unit, or the initial unit needs to be replaced by a model having
larger current capacity. Particularly for loads into which a transient peak current flows,
the current must be set such that its peak does not reach (or exceed) the current limit. If
the unit enters constant-current operation mode even when the current is set within the
rated output current, the current capacity needs to be raised.
Next, we consider a case of using a load resistance of 25
Ω
. In this case, when the
output current limit is set to 4 A or more, the power supply is capable of outputting
voltages from 0 V to the rated maximum output voltage while in constant-voltage
operation mode. In this load condition, the output voltage limit is the rated maximum
output voltage (for these conditions) and the output current is gradually increased from
0 A. At this time, the power supply is operating in the constant-current (CC) operation
mode. The power supply increases the output voltage in order to source the current
setting. When the output voltage reaches the supply's maximum rated output of 100 V,
no more current can be sourced to this load, regardless of the current setting. If you
wish to raise further the current flow in this condition, another power supply needs to be
connected in series to the relevant unit or the output voltage needs to be raised.
Particularly for loads where a transient surge voltage is generated, the voltage must be
set so that the surge voltage does not reach (or exceed) the voltage limit.
Load line of RL = 4
Ω
Load line of RL = 10
Ω
Load line of RL = 25
Ω
Area where current
capacity needs to be increased
Area where voltage
increase is required
0 5 A 10 A 9 A 4 A
50 V
90 V
100 V
40 V
Output current Io
Output voltage Eo
Fig. 2-7 Constant Voltage Operation and Constant Current Operation