| 摘要 |
<p>There is disclosed an electronic switching ballast for a fluorescent lamp comprising a rectifier (1), a constant-voltage regulator (2), a square-wave generator (4) for generating a square-wave output voltage, a phase discriminator (6) for full-wave rectifiying of feed-back voltage from a wave-shaping circuit (11) by comparing it with a reference voltage, a switching time differentiating circuit (5) for combining the output wave of said phase dicriminator (6) to arbitrarily limit the pulse width, first and second drivers (7,8) branched for each receiving the output of said switching time differentiating circuit (5), first and second output (9,10) circuits for alternately operating in response to the outputs of said first and second drivers (7,8), and said wave-shaping circuit (11) for modifying the outputs of said first and second output circuits (9,10) into a sine wave.</p> |
