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参数资料
| 型号： | 944U700K142ACM |
| 厂商： | Cornell Dubilier Electronics (CDE) |
| 文件页数： | 3/4页 |
| 文件大小： | 0K |
| 描述： | CAP FILM 70UF 1.4KVDC SCREW |
| 产品目录绘图： | 944U Series Side 944U Series Bottom |
| 特色产品： | 944U High Current Film Capacitor |
| 标准包装： | 1 |
| 系列： | 944U |
| 电容： | 70µF |
| 额定电压 - DC： | 1400V（1.4kV） |
| 电介质材料： | 聚丙烯，金属化 |
| 容差： | ±10% |
| ESR（等效串联电阻）： | 1.4 毫欧 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 底座安装 |
| 封装/外壳： | 径向，Can - 螺丝端子 |
| 尺寸/尺寸： | 3.327" 直径（84.50mm） |
| 高度 - 座高（最大）： | 2.559"（65.00mm） |
| 端子： | 螺钉端子 |
| 引线间隔： | 1.772"（45.00mm） |
| 特点： | 大电流 |
| 包装： | 散装 |
| 产品目录页面： | 2084 (CN2011-ZH PDF) |
| 其它名称： | 338-1927 |
Type 944U Polypropylene, DC Link Capacitors
High Current, Low Profile for Inverter Applications
Expected Lifetime Predictions
To use the Expected Lifetime curves calculate Va ?Vr and core
temperature T. Start by estimating:
Applied dc voltage Va
Ripple Current I
Ripple Frequency f
Ambient Temperature Ta
Airflow speed v
Units:
A=m2 T, Ta & Tc=°C
C=μF θ, θca & θcc =°C/W
ESR=mΩ v=m/s
f=kHz Va &Vr=Vdc
I=A
NOTE: The temperature rise in the 944U is I2(ESR) times the
thermal resistance θ. The ESR is mainly the metal resistance;
the metal resistance is the 10 kHz ESR. For operation below 10kHz
add the dielectric resistance. It is the dielectric dissipation factor—
no more than 0.0002—times the capacitive reactance, i.e., 0.0002
?(2πfC). That’s equal to 31.83 ?(fC).
1. Start with the 10 kHz ESR from the Ratings table. If frequency is less
than 10 kHz, add 31.83 ?(fC).
2. Compute total thermal resistance θ as the sum of core-to-case
thermal resistance θcc and case-to-ambient thermal resistance
θca. Both are in the Ratings table but θca is for still air and θcc
is for 10 kHz or less. For frequency > 10 kHz multiply θcc by
[1+(f –10)/100], e.g., for 75 kHz multiply θcc by 1.65. For moving
air use the capacitor surface area A and airflow speed v to calculate
θca = 1 ?[A(5+17.5(v+0.1) 0.66 )].
3. Compute Va ?Vr and the core temperature T.
T = Ta + I2(ESR)θ
4. Look up estimated lifetime from the Expected Lifetime curves.
5. If you want a longer expected lifetime, choose a capacitor with
higher voltage rating or consider using multiple capacitors in parallel to
share the ripple current.
The expected lifetime predictions assume no exposure to overvoltage transients.
Expected lifetime can be calculated for varying exposure to overvoltage transients.?
As an illustration at 50 °C the expected lifetime is 100,000 h with the 24-hour Va ∕ Vr
profile below:
Va / Vr
?1.67????
?1.50????
?1.30????
?1.10????
?1.00
Duration
100 ms
5 minutes
2.5 hours
9.6 hours
11.9 hours
For applications with more severe 24-hour profiles, contact us.
Expected Lifetime vs Hot Spot Temperature and Applied DC Voltage
1.6
1.5
1.4
50oC
1.3
60oC
1.2
70oC
1.1
1
0.9
0.8
85oC
1000
10000
100000
1000000
Expected Lifetime (h)
CDE Cornell Dubilier ? 1605 E. Rodney French Blvd. ? New Bedford, MA 02744 ? Phone: (508)996-8561 ? Fax: (508)996-3830
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