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參數(shù)資料
| 型號： | MC1H3 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | High Voltage Power Module Users Guide |
| 中文描述： | 高壓電源模塊用戶指南 |
| 文件頁數(shù)： | 22/60頁 |
| 文件大小： | 1522K |
| 代理商： | MC1H3 |
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dsPICDEM MC1H 3-Phase High Voltage Power Module
DS70096A-page 16
2003 Microchip Technology Inc.
For a fixed DC bus voltage, the PFC diode is more heavily thermally loaded the
higher the AC input voltage. This is simply due to the increase in power through-
put with higher AC input voltage due to the fixed input current. For a given AC
input voltage operation at lower DC bus voltage will also load the diode more
heavily thermally as the average current increases for the constant power
throughput.
1.3.3
Input Current Limits when Not Using the Active PFC
If the user does not wish to use the PFC stage, the PFC switch can simply be left off.
However the PFC inductor and diode will be left in circuit and the input current will
remain limited to 5A (RMS) and 8.9A Peak to protect the diode. The user will also
notice a large droop with increasing load when the PFC inductor is left in circuit.
Section 1.5.3.3 “Bypassing The PFC”
explains how to modify the unit to bypass the
PFC diode or the whole PFC stage.
With the PFC diode removed from the circuit, the rated current increases to 6A (RMS)
limited by the loss in the PFC inductor. With the PFC inductor also removed from the
circuit the rated current increases to 7A (RMS) limited by the NTC soft-start thermistor
and the diode bridge. Note that with the PFC inductor removed from the circuit it is
possible that less input power will be possible despite the higher permitted input
current. This is for two reasons. Firstly because the power factor will be lower without
the PFC inductor to smooth the input current. Secondly, the DC input over-current
protection will be more easily tripped by the surge of current that occurs on initial
conduction of the Diode Bridge.
1.3.4
DC Bus Voltage Ripple
The unit has been designed with 3 x 330
μ
F DC bus capacitors in parallel thus giving
approximately 1 mF of capacitance. This value is substantially more than a fitting to a
commercial drive of this rating, when running off single-phase 208V AC or higher
when using the PFC. Given the development nature of the system, the capacitance
was oversized to assist those users wishing to use the system without the PFC or at
lower voltages. Figure 1-6 gives the peak-peak DC bus voltage ripple for three
different conditions.
Note:
The over current trip levels are set above the peak of the rated output. This
is to allow for current ripple, modest amounts of acceleration and to prevent
nuisance trips. The user should avoid operating the system beyond the
peak rated output of 7.1A RMS continuously or controlling the input
waveshape to be anything other than the correct half-sinusoid. Operation
of the system just beneath the over-current trip levels may affect long-term
reliability of the switches and should be avoided.
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