LED device protection circuit and method thereof

An LED device protection circuit, comprising:

• a first comparator, a protection-signal generating circuit, a sampling-voltage acquisition circuit, and a first reference-voltage acquisition circuit, wherein:
• a first input terminal of the first comparator is connected with an output terminal of the sampling-voltage acquisition circuit;
• a second input terminal of the first comparator is connected with an output terminal of the first reference-voltage acquisition circuit;
• an output terminal of the first comparator is connected with an input terminal of the protection-signal generating circuit;
• the first comparator is configured for comparing a sampling voltage outputted from the sampling-voltage acquisition circuit with a first reference voltage outputted from the first reference-voltage acquisition circuit, and outputting a pulse signal in accordance with a comparison result;
• the protection-signal generating circuit is configured for receiving the pulse signal outputted from the first comparator, and generating a protection signal when the pulse signal satisfies a preset condition, wherein:
• the protection-signal generating circuit includes a second comparator, a second reference-voltage acquisition circuit, and a filter circuit;
• the output terminal of the first comparator is connected with an input terminal of the filter circuit;
• a first input terminal of the second comparator is connected with an output terminal of the filter circuit;
• a second input terminal of the second comparator is connected with an output terminal of the second reference-voltage acquisition circuit;
• and
• an output terminal of the second comparator is configured for outputting the protection signal;
• and
• the protection signal is configured for turning off an output load connected to a dimmer.