| 摘要 |
<p>A three-level dimming circuit (10) for a discharging lamp includes a first contact (11), a second contact (13), and a third contact (15), a first full-wave rectification circuit (21) connected to the first contact (11) and the third contact (15), and a second full-wave rectification circuit (31) connected to the first contact (11) and the second contact (13). A selection circuit (41) includes three resistors (R1,R2,R3) and a first electrical controlled switch (Q1). A half-wave rectification circuit (51) includes a second electrical controlled switch (Q2) and a third electrical controlled switch (Q3) in series connection. The three resistors (R1,R2,R3) of the election circuit (41) are the main devices for dimming that the present invention has a lower cost and superior competition in the market.</p> |
