| 摘要 |
<p>A commercial power supply is connected to a rectifier (DB) through a low-pass filter (LPF). A smoothing capacitor (Cs), a series circuit of voltage dividing capacitors (C1, C2) and a series circuit of switching elements (Q1, Q2) are connected in parallel to the output of the rectifier (DB). Diodes (D1, D2) are connected in inverse-parallel to the respective switching elements (Q1, Q2), and a driving circuit (DR) is connected to the switching elements (Q1, Q2). A load circuit (R) consisting of a parallel circuit of an inductor (Lo), a fluorescent lamp (LT) and a resonance capacitor (C4) is connected between the node between the voltage dividing capacitors (C1, C2) and the node between the switching elements (Q1, Q2). By turning on/off the switching elements (Q1, Q2), the inductor (Lo) is operated as a step-up inverter to generate a stable high frequency high voltage across the inductor (Lo). Thus, a neutral-point inverter which generates a high frequency higher voltage with little 'waving' is provided.</p> |
