High Energy Disk resistors offer unsurpassed performance in high energy and high voltage applications. These non-inductive, ceramic composite resistors are designed for pulse shaping, crowbar, capacitor charge/discharge… any application requiring low inductance along with extremes of voltage and energy. They are ideally suited for use in pulsed power systems, where these resistors distribute energy uniformly throughout their structure for low thermal stress. The standard, high-temperature silicone coating enhances high voltage performance in air. Optional configurations optimize performance in other gaseous or fluid dielectrics.
Part Number
O.D. (mm)
I.D. (type)
Thickness1 (mm)
Energy2 (kJoules)
Max. Impulse Volts3 (kVolts)
Resistance Range (Ohms)
32
D
25.4
5
18.7
2.0 - 10K
50
C
25.4
12
20.4
1.0 - 3.3K
75
A,B,C
25.4
25
23.3
0.5 - 1.0K
112
A,B,C
25.4
67
26.2
0.2 - 390
152
A,B,C
25.4
110
28.3
0.10 - 100
Notes: 1. Custom thickness available, affects ratings 2. Single impulse to cause 125° temp rise 3. Standardized for a 50W resistor in std. air, 1.2/50usec. pulse width
Applications
High Energy Disk resistors are most often used for low repetition rate discharge, crowbar, pulse shaping or other impulse duty. In practice, a single resistor disk or combination is usually selected to yield no more than 100°C rise for the expected applied energy. Because of the large mass, a relatively long cooling time is required between pulses, or additional heat capacity must be allowed for.
Power Dissipation
Continuous power dissipation for High Energy Disk resistors is a function of mounting method used. In free air, .25 watt per cm² of exposed surface area is a conservative rule of thumb. Thus, a 50mm disk with both faces and the periphery exposed could easily dissipate 20 watts. Higher power dissipation is achieved by conduction cooling through the mounting surface, applying an air or water cooled heat sink to either or both faces. See product information in Custom Assemblies section for more information on this subject, or consult our applications group.
Impulse Voltage
Maximum impulse voltage is mainly a function of resistance value and pulse width, and to a lesser extent, surface temperature and dielectric medium. The chart below shows the range of maximum impulse voltage for the standardized 1.2 / 50 µsec. pulse width in air.
HVR Advanced Power Components
Phone: 716-693-4700
Fax: 716-693-4774
Email: mail@hvrapc.com
