A control circuit for multiple series-connected sequential turn signals

By connecting N first turn signal constant current circuits and at most one second turn signal constant current circuit in parallel, the state of the switching circuit is controlled, which solves the temperature rise problem in the turn signal and daytime running light drive circuits, and achieves a reduction in load current and cost control.

CN224439246UActive Publication Date: 2026-06-30SUZHOU YAOTENG PHOTOELECTRIC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SUZHOU YAOTENG PHOTOELECTRIC
Filing Date
2025-08-12
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

In the existing technology, the design of the drive circuit for turn signals and daytime running lights leads to the problem of temperature rise in the constant current transistor of the turn signal and the temperature rise of the components in the DC-DC drive circuit, and the cost increases due to the use of two DC-DC switching power supplies.

Method used

The system employs N first turn signal constant current circuits and at most one second turn signal constant current circuit, connected in parallel. By controlling the level state of the MCU circuit IO port, the switching circuit state is switched to reduce the load current. Only half of the switching circuits are activated when necessary, thus reducing the temperature rise of the drive circuit.

Benefits of technology

It effectively reduces the temperature rise of the turn signal drive circuit, lowers the load current, avoids increased costs, and achieves efficient circuit temperature rise management.

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Abstract

This invention provides a driving circuit for controlling multiple series-connected sequential turn signals, comprising N first turn signal constant current circuits and at most one second turn signal constant current circuit connected in parallel. Each first turn signal constant current circuit includes 2n LED beads connected in series and n first switching circuits, each first switching circuit controlling two LED beads; n is an integer greater than or equal to 2, 2n is the number of LED beads connected in series for daytime running lights, and N is an integer greater than or equal to 1. The second turn signal constant current circuit includes M-2n*N LED beads connected in series, ⌊(M-2n*N) / 2⌋ first switching circuits, and at most one second switching circuit, each first switching circuit controlling two LED beads and each second switching circuit controlling one LED bead; M is the total number of LED beads in the turn signals. This invention provides a driving circuit for controlling multiple series-connected sequential turn signals, reducing load current and improving the temperature rise of the driving circuit.
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