A Non-inductive Coil Design Used to Provide High-Frequency and Large Currents

Area of Science:

• Electrical Engineering
• Electromagnetics
• High-Frequency Current Source Design

Background:

• Existing high-frequency current sources struggle to simultaneously meet demands for high peak current and low rise times.
• Switching devices and wire materials impose limitations on current amplitude and response speed.
• Inductance in coil designs hinders high-frequency current flow.

Purpose of the Study:

• To design a non-inductive coil capable of producing high-frequency, high-current sources with low rise times.
• To mitigate the hindering effect of inductance on high-frequency currents.
• To enable simultaneous achievement of high peak current and rapid rise times.

Main Methods:

• Designed a non-inductive coil using the ampere-turn method for linear current synthesis.
• Applied the principle of transformer coupling and the law of energy conservation to eliminate inductive effects.
• Utilized a two-layer, 28-turn coil configuration.

Main Results:

• Achieved inductance 42 times smaller compared to a standard spiral PCB coil.
• Measured inductance of 6.69 μH.
• Calculated output current amplitude up to 33 kA with a rise time of 20 ns, showing minimal distortion for a 1 MHz square wave.

Conclusions:

• The developed non-inductive coil design effectively addresses the limitations of conventional high-frequency current sources.
• The innovative method of consuming stored inductor energy successfully eliminates inductive hindrance.
• This design provides a viable solution for achieving high peak currents and low rise times in high-frequency applications.