MULTI-MODE LED LAMP STRING CONTROL CIRCUIT AND LED LAMP STRING

摘要

The present invention is suitable for the field of LED drive control, and provides a multi-mode LED lamp string control circuit and an LED lamp string. The LED lamp string control circuit comprises: a time sequence control circuit board (1) and a drive control circuit board (2). The time sequence control circuit board (1) comprises a clamping voltage-dividing circuit (11), a first single-chip microcomputer and a flashing mode control circuit (12). The drive control circuit board (2) comprises a plurality of LED drive circuit groups (21), each LED drive circuit group (21) comprising a plurality of LED drive modules (201) connected in parallel. Without altering the structure of two power supply lines of the lamp string, the LED lamp string is powered via a high voltage, and variation of an operating frequency of the single-chip microcomputer is used to enable the single-colour or multi-colour lamp string to sequentially change between a simultaneous flashing mode, a flowing flashing mode and a random flashing mode, and a lamp string segment-change flashing automatic demonstration function is implemented via timed resetting, significantly increasing the liveliness and diversity of the flashing of the LED lamp string.