Over-voltage lockout protection circuit and LED drive circuit using same

Abstract

The invention relates to an over-voltage lockout protection circuit, which comprises an acquisition detection module and a protection execution module, wherein the acquisition detection module is used for detecting a working electric signal of an LED load and generating a first control signal according to the working electric signal; the protection execution module generates a second control signal according to the first control signal, and the second control signal is used for controlling the disconnection of switching power circuit which supplies power to the LED load and realizing the lockout; and the working electric signal is a voltage signal and / or a current signal. The invention also relates to an LED drive circuit using the over-voltage lockout protection circuit. In the over-voltage lockout protection circuit and the LED drive circuit, when over-voltage is output, the over-voltage lockout protection circuit can quickly turn off and lock the switching power circuit so that thewhole circuit is in a low power consumption turn-off state and the energy consumption loss during a failure is reduced. The over-voltage lockout protection circuit and the LED drive circuit have simple structures, are suitable for ship-borne light fittings, and can well solve the problem that the output voltage of a ship-borne power supply system fluctuates to result in short service life of an LED light source.

Description

technical field [0001] The present invention relates to the technical field related to LED power drive, and more specifically, relates to an overvoltage lockout protection circuit and an LED drive circuit using the circuit. Background technique [0002] LED light sources have the advantages of high efficiency, energy saving, long life, and low-voltage controllability, so they are widely used in various lighting fields. In practical applications, the driving voltage of the LED light source has a direct impact on the luminous efficiency and life, so the output overvoltage protection of the LED driving circuit is particularly important. At present, the output overvoltage protection circuits of some LED driving circuits are often complicated, and cannot realize the overvoltage protection locking function. [0003] At the same time, considering the particularity of the use environment, the power supply network of marine lighting is different from that of ordinary commercial powe...

AI Technical Summary

Problems solved by technology

At present, the output overvoltage protection circuit of some LED driving circuits is often complicated, and the overvoltage protection locking function cannot be realized.

[0003] At the same time, considering the particularity of the use environment, the power supply network of marine lamps is different from that of ordinary commercial power. The shipboard power supply system may supply power to multiple load devices at the same time, resulting in large fluctuations in output voltage.

In the current shipboard power supply system, after the output voltage changes, it is still impossible to ensure that each LED light source has an appropriate voltage at both ends, and it does not have the overvoltage protection locking function.

If the output voltage is a periodic overvoltage in hiccup mode, the LED light source will always be subjected to repeated high voltage shocks, seriously affecting the life

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