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VI-ARM-H22 参数 Datasheet PDF下载

VI-ARM-H22图片预览
型号: VI-ARM-H22
PDF下载: 下载PDF文件 查看货源
内容描述: 自动调节整流模块高达1500瓦 [Autoranging Rectifier Modules Up to 1500 Watts]
分类和应用:
文件页数/大小: 12 页 / 302 K
品牌: VICOR [ VICOR CORPORATION ]
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Application Note, continued  
Determining Ripple Voltage on the Hold-up Capacitors.  
Fig. 15 is used to determine ripple voltage as a function of  
operating power and bus capacitance, and shows that the ripple  
voltage across the hold-up capacitors will be 12Vac.  
80  
75  
70  
65  
60  
55  
50  
45  
40  
Determining the Ripple on the Output of the  
DC-DC Converter. Fig. 16 is used to determine the ripple  
rejection of the DC-DC converter and indicates a ripple  
rejection of approximately 60 dB for a 12 Volt output. If the  
ripple on the bus voltage is 12Vac and the ripple rejection of  
the converter is 60 dB, the output ripple of the converter due to  
ripple on its input (primarily 120Hz) will be 12 mV p-p.  
Note that 2nd Generation converters have greater ripple  
rejection then either VI-200s or VI-J00s.  
2
5
15  
30  
50  
Output Voltage  
For more information about designing an autoranging AC  
input power supply using the ARM and Vicor DC-DC  
converter modules, contact Vicor Applications Engineering at  
the nearest Vicor Technical Support Center (see back cover),  
or send an E-mail to apps@vicr.com.  
Figure 16—Converter ripple rejection vs. output voltage  
Another consideration in hold-up capacitor selection is their  
ripple current rating. The capacitors’ rating must be higher than  
the maximum operating ripple current. The approximate  
operating ripple current (rms) is given by:  
• • •  
Irms = 2P/Vac  
(7)  
Where: P = operating power level  
Vac = operating line voltage  
Calculated values of bus capacitance for various hold-up time,  
ride-through time, and ripple voltage requirements are given as  
a function of operating power level in Figures 13, 14, and 15,  
respectively.  
Example  
In this example, the output required at the point of load is 12Vdc  
at 320 Watts. Therefore, the output power from the ARM would  
be 375 Watts (assuming a converter efficiency of 85%). The  
desired hold-up time is 9 ms over an input range of 90 to 264Vac.  
Determining Required Hold-up Capacitance. Fig. 13 is used  
to determine hold-up capacitance for a given hold-up time and  
power level, and shows that the total bus capacitance must be  
at least 820µF. Since two capacitors are used in series, each  
capacitor must be at least 1,640µF. Note that hold-up time is  
not dependent on line voltage.  
Determining Ride-through Time. Figure 14 illustrates ride-  
through time as a function of line voltage and output power,  
and shows that at a nominal line of 115Vac, ride-through would  
be 68 ms. Ride-through time is a function of line voltage.  
Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715  
ARM, Autoranging Rectifier Module  
Rev. 2.4  
Page 9 of 12  
Set your site on VICOR at www.vicorpower.com