| 摘要 |
<p>An AC/DC converter includes a rectifying circuit (D1), a main switching device constituted by an N-channel IGBT (QM1) or an N-channel FET (QM2), a control circuit (17), a booster circuit (18), and a series power supply circuit (11). The rectifying circuit (D1) rectifies a half wave of an input AC voltage (ACIN). One end of the current path of the main switching device (QM1 or QM2) is supplied with a half-wave rectifying output from the rectifying circuit (D1). The control circuit (17) turns on the main switching device (QM1 or QM2) when a voltage between the gate and the other end of the main switching device (QM1 or QM2) exceeds a first level, and turns off the main switching device (QM1 or QM2) when the voltage exceeds a second level which is higher than the first level. The booster circuit (18) boosts the voltage between the gate and the other end of the main switching device (QM1 or QM2) to a level which is higher than the second level when the voltage exceeds the first level. The series power supply circuit (11) has an input terminal to which the other end of the current path of the main switching device (QM1 or QM2) is connected, and outputs a DC voltage (VOUT). <IMAGE></p> |
