| 摘要 |
<p>A circuit for electrically powering LEDs from an AC mains voltage in a lighting apparatus, comprises a rectifier bridge (11) with an input (12) connected to the electricity mains and with an output (14) which supplies with a pulsating rectified voltage a constant-current stage (15), at the output (16) of which an LED array (17) and a smoothing capacitor (18) are arranged in parallel. The circuit may also comprise a phase-regulating dimmer (26) arranged at the input of the rectifier bridge (11). An apparatus according to the invention may comprise a printed circuit board with at least one mains power supply circuit and LED thereon.</p> |
