LED (light-emitting diode) stroboflash-removing protection circuit

By designing a destrobe protection circuit in the LED power supply, and using transistor Q2 and resistors R2 and R3 to detect the voltage across MOS tube Q1, the problem of damage to the LED power supply when the output positive and negative lines is short-circuited, effective protection of MOS tube Q1 is achieved, and the reliability of the LED power supply is improved.

CN222655372UActive Publication Date: 2025-03-21GUANGZHOU LONGDU ELECTRONICS
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Patent Information

Application Number
CN202421332380.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-12
Publication Date
2025-03-21
Estimated Expiration
2034-06-12

AI Technical Summary

Technical Problem

Existing LED power supplies are prone to damage when the output positive and negative lines are short-circuited, resulting in strobe problems.

Method used

An LED destrobe protection circuit is designed. By adding a protection circuit to both ends of MOS tube Q1, including transistor Q2, resistors R2 and R3, the voltage across MOS tube Q1 is detected. When a specific threshold is reached, transistor Q2 is turned on and MOS tube Q1 is turned off to prevent instantaneous large current breakdown.

Benefits of technology

When the output positive and negative lines are shorted, the protection circuit effectively prevents the MOS tube Q1 from being damaged, improves the reliability of the LED power supply, and avoids strobe problems.

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Abstract

The utility model relates to an LED stroboflash-removing protection circuit. An LED constant current power supply; the output end of the LED constant-current power supply is connected with the drain electrode of the MOS tube Q1, the source electrode of the LED constant-current power supply is connected with the positive electrode of the LED output end, the grid electrode of the LED constant-current power supply is connected with the negative electrode of the LED output end sequentially through the resistor R1 and the capacitor C1, the resistor R1 is further connected with the output end of the LED constant-current power supply through the diode D2, one end of the LED constant-current power supply is connected with the drain electrode of the MOS tube Q1, and the other end of the LED constant-current power supply is connected with the positive electrode of the MOS tube Q1. The other end of the diode D3 is connected with the source electrode of the MOS tube Q1; the circuit further comprises a triode Q2, a base electrode of the triode Q2 receives a starting signal, an emitting electrode of the triode Q2 is connected with a source electrode of the MOS tube Q1, the emitting electrode is further connected with the output end of the LED constant-current power supply through a resistor R3 and a resistor R2 in sequence, and a collector electrode of the triode Q2 is connected with the resistor R1.
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