LED overvoltage protection circuit, power supply module and electronic equipment

Abstract

The invention discloses an LED overvoltage protection circuit, a power supply module and electronic equipment, and relates to the field of electronic circuit design. The LED overvoltage protection circuit comprises a positive voltage overvoltage detection circuit, a negative voltage overvoltage detection circuit, a comparison self-locking circuit and a reference circuit; and the comparison self-locking circuit is respectively connected with the reference circuit, the positive voltage overvoltage detection circuit and the negative voltage overvoltage detection circuit. A first LED works under the positive voltage input by a positive voltage output end, and a second LED works under the negative voltage input by a negative voltage output end, so when the positive voltage input by the positivevoltage output end is too high or the negative voltage input by the negative voltage output end is too low, the comparison self-locking circuit is in a self-locking state, the voltage of the positiveinput end of the first voltage comparator of the comparison self-locking circuit is larger than the first reference voltage of the negative input end, the first voltage comparator outputs a high-level signal, the comparison self-locking circuit is in the self-locking state all the time, and protection of the power module is triggered.

Description

technical field [0001] The present application relates to the field of electronic circuit design, in particular to an LED overvoltage protection circuit, a power supply module and electronic equipment. Background technique [0002] With the development of science and technology, light-emitting components are often used in people's lives. Light-emitting diodes (LEDs, Light Emitting Diode) are widely used in various electronic devices due to their advantages of energy saving, high-speed switching, and fast response. Therefore, the LED overvoltage protection circuit has become one of the research focuses of those skilled in the art. [0003] A backlight solution includes at least two LEDs, one of which is driven by a positive voltage and the other is driven by a negative voltage. Using the above-mentioned backlight solution can simplify the circuit design and effectively reduce the number of devices, thereby To achieve the purpose of reducing costs. However, commonly used LED...

AI Technical Summary

Problems solved by technology

However, the commonly used LED overvoltage protection circuit can only protect LEDs driven by positive voltage or LEDs driven by negative voltage, so it is necessary to design an LED overvoltage protection circuit for the above backlight scheme

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