| 摘要 |
PROBLEM TO BE SOLVED: To provide a stepping-down switching DC/DC converter capable of achieving a low-noise configuration. SOLUTION: The stepping-down switching DC/DC converter includes an input coil L1 connected to a DC power source E, an output coil L2 connected to a load R, a switch S turning on/off the connection of both coils, and an output capacitor C smoothing an output voltage. The series circuit from the connecting point of the input coil L1 and the switch S to a first intermediate capacitor C1 and a first intermediate coil Lm1, is connected to the series circuit from the connecting point of the output coil L2 and the switch S to a second intermediate capacitor C2 and a second intermediate coil Lm2. The connecting point of the first intermediate capacitor C1 and the first intermediate coil Lm1 is connected to the connecting point of the second intermediate capacitor C2 and the switch S, through a diode D serving as a switching element for turning on/off together with the switch S in a complementary manner. The input coil L1 is magnetically coupled with the first intermediate coil Lm1; and also the output coil L2 is magnetically coupled with the second intermediate coil Lm2. COPYRIGHT: (C)2009,JPO&INPIT
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