HIGH-BANDWIDTH CURRENT-sensing EXTRACTION- COIL SENSOR

A high-bandwidth current-sensing extraction-coil sensor, comprising:

• a single-turn current extraction coil, a coil terminal matching resistor Rd, and a signal processing circuit;
• wherein the single-turn current extraction coil is configured to generate a voltage based on an input current by using Faraday's law, and the single-turn current extraction coil comprises single-turn copper coils;
• the coil terminal matching resistor Rd is connected to the single-turn current extraction coil and is configured to perform impedance matching on the voltage to generate a matched voltage signal;
• the signal processing circuit is connected to the single-turn current extraction coil and the coil terminal matching resistor Rd individually, and is configured to restore the matched voltage signal and output a restored current to realize current detection;
• the single-turn current extraction coil further comprises a printed circuit board (PCB) and copper holes;
• the single-turn copper coils comprise a first single-turn copper coil, a second single-turn copper coil, a third single-turn copper coil, a fourth single-turn copper coil, a first connection portion single-turn copper coil, a second connection portion single-turn copper coil, and a third connection portion single-turn copper coil;
• and the third single-turn copper coil and the fourth single-turn copper coil are both square ring-shaped single-turn coils with openings;
• the PCB is defined with two circular openings symmetrically arranged, and the first single-turn copper coil and the second single-turn copper coil are respectively arranged around the two circular openings;
• the third single-turn copper coil is arranged on the PCB, and the third single-turn copper coil is located to a left side of the first single-turn copper coil, a lower surface of the first single-turn copper coil and an end of the opening of the third single-turn copper coil are located in a same horizontal plane, and the lower surface of the first single-turn copper coil and the end of the opening of the third single-turn copper coil are connected through the first connection portion single-turn copper coil;
• the fourth single-turn copper coil is arranged on the PCB, and the fourth single-turn copper coil is located to a right side of the second single-turn copper coil, an upper surface of the second single-turn copper coil and an end of the opening of the fourth single-turn copper coil are located in a same horizontal plane, the upper surface of the second single-turn copper coil and the end of the opening of the fourth single-turn copper coil are connected through the second connection portion single-turn copper coil, and the third single-turn copper coil and the fourth single-turn copper coil are symmetrically arranged along a center;
• another end of the opening of the third single-turn copper coil and another end of the opening of the fourth single-turn copper coil are connected through the third connection portion single-turn copper coil, and the third connection portion single-turn copper coil is located between the first single-turn copper coil and the second single-turn copper coil;
• and
• a length of the PCB is 9 milliliters (mm), a width of the PCB is 4.5 mm, diameters of the copper holes are both 0.9 mm, and ring widths of the third single-turn copper coil and the fourth single-turn copper coil are both 0.4 mm.