| 摘要 |
<p>An LED alternating-current drive device with a high power factor, comprising a plurality of drive units. The plurality of drive units are successively connected in series, one end of the plurality of drive units which are connected in series is connected in series to a current-limiting circuit and is connected to a positive output end of a bridge-type rectification circuit, and the other end thereof is connected in series to a load and connected to a negative output end of the bridge-type rectification circuit; the drive units consist of a current-limiting circuit, a control switch, a load and a current detection unit, an input end of the current-limiting circuit in the drive units is used as an input end of the drive unit and is connected to an input end of the load, and an output end of the current-limiting circuit is connected to one end of the control switch; an output end of the load is connected to an input end of the current detection unit; and a feedback end of the current detection unit is connected to a control end of the control switch, and an output end of the current detection unit is used as an output end of the drive units and is connected to the other end of the control switch. By connecting a plurality of current-limiting circuits to corresponding LED lamp strings in parallel and then connecting same in series to constitute a drive circuit, the power factor of the drive circuit is improved.</p> |
