| 摘要 |
<p>In a power supply circuit, a rectification circuit (2) is coupled to a partial smoothing circuit (7), and an inverting circuit (4). The rectification circuit includes a rectifier coupled to a primary capacitor (C1). The partial smoothing circuit includes a first (D5), second (D6), and third diode (D7) coupled together with the third diode in reverse polarity with the first and second diodes. The partial smoothing circuit also includes a series combination of a choke coil (L1) and a smoothing capacitor (C4) disposed in parallel with the second diode (D6). A diode (D8) extends from the partial smoothing circuit to the inverting circuit. In one embodiment, the inverting circuit includes a main capacitor (C3) in parallel with a combination of a winding (Trla) and an auxiliary capacitor (C2). A switching means (Q1) is coupled to the inverting circuit and the rectification circuit. <IMAGE></p> |
