A full voltage segmented linear constant-current led drive circuit in auto switchover mode

Abstract

The present invention discloses a full voltage segmented linear constant-current LED drive circuit in an auto switchover mode, comprising a minimum two groups of LEDs in parallel connection in proper sequence and a voltage detection and control circuit used for detection of power voltage; positive terminal of each group of LEDs is directly connected or indirectly connected to the power source via the change-over switch; negative terminal of each group of LEDs is grounded via corresponding control switch; wherein, one group of LEDs comprises a minimum two groups of LED units in series connection in proper sequence; negative terminal of each LED unit is grounded via corresponding control switch; the change-over switch and control switch are connected to and controlled by the voltage detection and control circuit to change inter-group parallel connection mode and ON/OFF of different LED units. The drive circuit according to the present invention can switch over series and parallel connection mode of LED, which can also easily adjust total load current in time according to voltage fluctuation mode, and thereby reduce harmonic distortion, and cater to power factor.

Dependencies are inferred from the claim text.