Active LED afterglow removing circuit

By using an active LED afterglow elimination circuit, a controllable discharge circuit composed of field-effect transistors is used to quickly discharge the residual current when the LED is turned off, thus solving the LED afterglow phenomenon and achieving low-cost, high-compatibility, and fast-response LED driving effect.

CN224139176UActive Publication Date: 2026-04-17FOSHAN GEZHENG POWER TECH CO LTD
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Patent Information

Application Number
CN202520823688.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-04-28
Publication Date
2026-04-17
Estimated Expiration
2035-04-28

AI Technical Summary

Technical Problem

In existing technologies, LED chips exhibit afterglow when turned off due to the minute current generated by coupling capacitance or parasitic inductance. Existing solutions are either costly or have slow response times, and cannot completely eliminate this phenomenon.

Method used

A controllable discharge circuit is adopted, which is an active afterglow elimination circuit composed of the first field-effect transistor Q1 and the second field-effect transistor Q2. The second field-effect transistor Q2 quickly discharges the residual voltage and current after the LED is turned off. Combined with the Zener diode Z1 protection element, the afterglow is quickly eliminated.

Benefits of technology

It achieves rapid elimination of LED afterglow, reduces costs, improves response speed, is suitable for low-power LED driving scenarios, and has good compatibility.

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Abstract

The utility model particularly relates to an active LED afterglow removing circuit, which comprises a VIN end, a grounding end GND, a light emitting diode LED1, a first field effect transistor Q1, a second field effect transistor Q2 and an ON / OFF control end, and is characterized in that the VIN end is connected to one end of a third resistor R3; the cathode of the LED 1 is connected with the pin 3 of the second field effect transistor Q2; a pin 1 of the second field effect transistor Q2 is connected to a pin 2 of the first field effect transistor Q1; a pin 3 of the first field effect transistor Q1 is connected with a grounding end GND; the first pin of the first field effect transistor Q1 is connected with an ON / OFF control end, a first capacitor C1 and a voltage stabilizing diode Z1 are connected between the first pin and the third pin of the second field effect transistor Q2 in parallel, the afterglow phenomenon is thoroughly eliminated through an active discharge mechanism, and the problems that a traditional passive scheme is delayed in response and high in cost are solved. The circuit is simple in structure and high in compatibility, and has the advantages of low cost and high reliability.
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