Paper fullness detection circuit and method for distinguishing infrared rays

Abstract

The invention discloses a paper fullness detection circuit and a paper fullness detection method for distinguishing infrared rays. The circuit comprises a power input end, an infrared transmitting circuit, an infrared receiving circuit and a signal output end, the power supply input end supplies power to the infrared transmitting circuit and the infrared receiving circuit; the infrared transmitting circuit emits infrared light; the infrared receiving circuit receives infrared light; the signal output end is electrically connected with the output end of the infrared receiving circuit; the circuit also comprises a single-chip microcomputer circuit, a first filter circuit and a second filter circuit; and the single-chip microcomputer circuit is electrically connected with the infrared transmitting circuit and controls the infrared transmitting circuit to emit pulse infrared light. According to the circuit, pulse infrared light signals are adopted to replace direct-current infrared light to serve as detection signals, the pulse infrared light signals can be effectively distinguished from direct-current signals of sunlight, interference of the sunlight is avoided, an anti-interference performance is high, and the height of paper scraps in a paper shredding barrel can be effectively judged.

Description

technical field [0001] The invention relates to circuits, in particular to a paper full detection circuit and method for distinguishing infrared rays. Background technique [0002] The paper full detection of the shredder usually passes through a pair of parallel infrared transmitting and receiving tubes, and the transmitting tube emits infrared light. As the height of paper scraps rises, the reflected light will become stronger and stronger. Set a height during production to reflect the intensity of light. When the emitted light intensity is greater than the set value, it will indicate that the paper is full. [0003] When designing a paper shredder, a transparent window is often left on the front of the shredder bucket for aesthetic effect. However, when the paper shredder is working in the office, the sunlight often shines directly into the office and then reflects to the shredder bucket, or The sunlight directly irradiates the paper shredder. We know that the sunlight i...

AI Technical Summary

Problems solved by technology

[0003] When designing a paper shredder, a transparent window is often left on the front of the shredder bucket for aesthetic effect. However, when the paper shredder is working in the office, the sunlight often shines directly into the office and then reflects to the shredder bucket, or The sunlight directly irradiates the paper shredder. We know that sunlight includes infrared light, so when the paper is full, the receiving tube receives the infrared light from the external sunlight and mistakenly thinks that the paper scraps are too high, and the reflected infrared light is strong, which leads to Wrong prompt shredder bin full of paper

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