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High nominal DC current rating up to 100A
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DC circuit filters → attenuate high frequency signals, in series with current pathway, present on top of DC current → “DC choke” or “ DC power choke”
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Two configurations*
1. Low DC resistance + high current
2. High inductance + low ripple
*Choosing one will compromise the other
Description
How it behaves
- When DC is first applied, the inductor opposes the sudden increase in current.
- After a short time (steady state), the current becomes constant.
- At steady DC, an ideal inductor behaves almost like a short circuit (very low resistance), apart from the resistance of the wire itself.
What do DC Power Chokes aim to solve
- Stabilising signal waveforms that consist of long unipolar pulses to a constant voltage level (DC)
- Storing energy of PWM converter topologies
| Voltage (RMS/peak) | 800V / 900V |
| Current (RMS/peak) | 100A / 110A |
| Min. current ripple * | 5 to 10A |
| Max. power ** | 20kW |
| DC resistance (Rdc) | ~10mΩ |
| Inductance | < 300 µH |
* Lower current ripple can be reached by compromising parameters → Mainly the RMS/peak current
** Power range can be extended when necessary. Expect increased volume and cost → consider planar when higher surface area to volume ratio is needed for thermal dissipation density
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PWM converter topologies: Buck, Boost, Buck-Boost, Ćuk, SEPIC and Zeta
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Output of forward converters
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DC charging systems
Frequently asked questions
Yes, we design custom inductors based on your electrical, thermal, and mechanical requirements.
DC power chokes can theoretically be made from all three construction types that ISE Magnetics offers; Toroidal, Linear and Planar.
However, the high current saturation of DC Power Chokes often makes the design tend towards toroidal shapes. High saturation bias and low losses can be realised, because the shorter magnetic path, compared to other shapes, requires less turns for the same inductance value.
Our DC Power Chokes will be able to handle up to 400Hz ripple frequencies without introducing high losses. Slight variations in DC bus voltage & current can therefore be suppressed safely.
If the main voltage source switches at 50-400Hz, meaning this frequency is not considered ripple, it is better to go with a purpose built mains or AC line choke.
Get in touch
Need a custom inductive component or replacement part?
Share your requirements and our team will get back to you within 2 business days.
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