Constant current drive led overcurrent and overvoltage protection circuit

Abstract

A constant current driven LED over-voltage and over-current protection circuit is used for protecting a series LED lamp group when over-voltage or over-current occurs. The constant current driven LED over-voltage and over-current protection circuit comprises a trigger module, a constant current driving module, an over-voltage protection module, and a sampling module. The trigger module triggers the constant current driving module to drive a series LED lamp group to be turned on. The sampling module is used for sampling the current of the series LED lamp group and feeding the current back to the constant current driving module. When the feedback current is higher than the rated current value, the constant current driving module controls the current output to the series LED lamp group to be decreased so as to avoid over-current of the series LED lamp group. The over-voltage protection module is used for sharing the voltage of the series LED lamp group to avoid over-voltage of the series LED lamp group when the output current of the constant current driving module is too high and over-voltage of the series LED lamp group is caused. Therefore, the series LED lamp group can be protected when the circuit is over-current or over-voltage.

Description

technical field [0001] The invention relates to an overcurrent and overvoltage protection circuit, in particular to a simple and easy-to-operate constant current drive LED overcurrent and overvoltage protection circuit. Background technique [0002] In modern electronic technology circuits, due to the high requirements for the output or input signal of electronic devices, the requirements for the range of input signals or output signals of electronic devices are relatively strict. For example, if the voltage signal is too high, it is easy to cause the electronic device to burn out or affect the service life. In reality, when the LED driving power supply is unstable, the output voltage signal may be too high, which may easily cause damage to the LED in the subsequent circuit. Or when the LED constant current source driver is working, when the output load is too large, and the internal components of the device or the external circuit are partially short-circuited, the load LE...

AI Technical Summary

Problems solved by technology

For example, if the voltage signal is too high, it is easy to cause electronic devices to burn out or affect the service life

In reality, when the LED drive power supply is unstable, the output voltage signal may be too high, which may cause damage to the LED in the subsequent circuit.

Or when the LED constant current source driver is working, when the output load is too large, and the internal components of the device or the external circuit have a partial short circuit, the load LED will over-current, which is easy to cause damage to the LED.

Images