CURRENT DETECTION CIRCUIT

PURPOSE: A current detecting apparatus using a bead core is provided to acquire value related to current flowing on a switching element without large power loss. CONSTITUTION: A current detecting apparatus(10) comprises a winding part(20) and a signal generator(30). The winding part comprises a bead core mounted on a switching element and a wire wound in the bead core. The bead core is a magnetic material. The bead core suppresses the electric noise. The bead core has a cylindrical shape. The bead core has a through-hole(21a). The signal generator generates the signals having value related to the current flowing in the switching element based on the current flowing in the wire. The signal generator comprises a resistor(31), a capacitor(32), and a diode(33). The resistor is serially connected between a terminal(P1) and a terminal(P2). The capacitor is connected to the terminal in parallel to the resistor. One end of the capacitor connects between the terminal and one end of the resistor. The other end of the capacitor connects between the terminal and the other end of the resistor. The diode is inserted between the terminal and the other end of the capacitor.