|
High-Current Film Caps Filter DC Up To 1400 Vdc
Cornell
Dubilier’s type 944U
high-current film capacitors
perform dc filtering for applications up to 1400 Vdc. These
“hockey puck” style capacitors are packaged in UL94V0
flame-retardant plastic cases that measure
84.5 mm in diameter with mounting flanges at the base (Fig. 1).
Case heights of 40 mm, 51 mm and 64 mm are available with M8
threaded stud terminals or M5 threaded inserts.
High-current
ratings and robust mounting flanges make these devices suited for
inverter applications in electric vehicles as well as solar power
inverters, wind power inverters and motor drives. Type 944U
capacitors are available in voltage ratings of 800 Vdc to 1400 Vdc,
capacitances from 33 µF to 220 µF, and rms current
ratings up to 75 A at 55°C (Table
and Fig 2). Capacitors are priced
from $25.
Fig
1. “The large diameter, low
profile and low inductance winding gives this package very
high-current capability,”
says Ken Thompson, product manager at
Cornell Dubilier.
Table.
Specifications for type 944U
high-current film capacitors
Catalog Part Number |
Cap
(µF) |
Rated Voltage
(Vdc) |
Height (mm) |
Max ESR
at 10 kHz (mΩ) |
Typical ESL (nH) |
Max Irms at 55°C
(A) |
Thermal Resistance |
θcc
(°C/W) |
θca
(°C/W) |
944U101K801AA* |
100 |
800 |
40 |
0.5 |
20 |
74 |
2.8 |
5.2 |
944U161K801AB* |
160 |
800 |
51 |
0.8 |
30 |
73 |
3.0 |
4.5 |
944U221K801AC* |
220 |
800 |
64 |
1.0 |
40 |
72 |
3.1 |
4.0 |
944U660K102AA* |
66 |
1000 |
40 |
0.6 |
20 |
70 |
2.8 |
5.2 |
944U101K102AB* |
100 |
1000 |
51 |
0.8 |
30 |
68 |
3.0 |
4.5 |
944U141K102AC* |
140 |
1000 |
64 |
1.0 |
40 |
65 |
3.1 |
4.0 |
944U470K122AA* |
47 |
1200 |
40 |
0.7 |
20 |
67 |
2.8 |
5.2 |
944U700K122AB* |
70 |
1200 |
51 |
1.0 |
30 |
65 |
3.0 |
4.5 |
944U101K122AC* |
100 |
1200 |
64 |
1.3 |
40 |
64 |
3.1 |
4.0 |
944U330K142AA* |
33 |
1400 |
40 |
0.8 |
20 |
64 |
2.8 |
5.2 |
944U520K142AB* |
52 |
1400 |
51 |
1.1 |
30 |
60 |
3.0 |
4.5 |
944U700K142AC* |
70 |
1400 |
64 |
1.4 |
40 |
59 |
3.1 |
4.0 |
Fig
2. Type 944U capacitors achieve high ripple-current
ratings as illustrated by curves for the 52-uF, 1400-V capacitor and
160-uF, 800-V capacitor. According to the company, the short form
factor of these components results in low ESR,
enabling these devices
to handle more ripple current than capacitors of similar volume.
|
