Multi-path output LED drive circuit with current protection

Abstract

The invention discloses a multi-output LED drive circuit with current protection. The multi-output LED drive circuit comprises an EMI filter module, a bridge rectifier module, a PFC boost module, a flyback module, an output module, an amplification comparison module, a control module and a power supply module. The amplification comparison module is used for amplifying an output signal acquired from the output module, comparing the output signal with a reference voltage, outputting a level signal to the control module, receiving a control signal of the control module and executing circuit protection on the output module; the output end of the output module is provided with a plurality of output ports connected in parallel, and the amplification comparison modules are connected with the output ports in a one-to-one mode. By means of the arrangement, when any path of output breaks down, the circuit can achieve electrified automatic protection and reduce current output, so that circuit faults caused by the fact that currents output by other paths exceed rated currents are avoided, and normal work of the other paths of output is not affected.

Description

technical field [0001] The invention relates to the field of driving power supply, in particular to an LED driving circuit. Background technique [0002] The LED drive power supply is a power converter that supplies the power supply to a specific voltage and current to drive the LED to emit light. When designing the LED drive circuit, it is necessary to consider the power factor, surge protection, and efficiency of the circuit to effectively ensure the high-quality work of the LED. . When the LED drive circuit is used to realize multiple outputs, the output parameters need to be consistent in order to realize the average current split and maintain the normal operation of each load. But when multiple outputs work at the same time, when one of them fails, such as open circuit or short circuit, the total output current of the power supply will be evenly distributed to the other channels, which will cause the current of each channel to exceed the rated current, resulting in cir...

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Problems solved by technology

But when multiple outputs work at the same time, when one of them fails, such as open circuit or short circuit, the total output current of the power supply will be evenly distributed to the other channels, which will cause the current of each channel to exceed the rated current, resulting in circuit failure.

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