Speed-changing anti-blocking anti-jamming paper shredder circuit and control method of motor thereof

Abstract

The invention relates to the field of the manufacturing of a paper shredder, and discloses a speed-changing anti-blocking anti-jamming paper shredder circuit which comprises a power supply circuit, a paper feeding sensing circuit, a forward-reversed switching circuit, a rectification circuit, a speed feedback circuit, a voltage speed regulation circuit, an MCU (microprogrammed controller unit) and a motor, wherein the input end of the speed feedback circuit is connected with the motor, the output end of the speed feedback circuit is connected with the MCU, the speed feedback circuit is used for transmitting a square-wave voltage signal representing the rotation speed of the motor to the MCU, the MCU is used for adjusting the voltage of the motor through the voltage speed regulation circuit according to the square-wave voltage signal and controlling the motor to rotate forwards or backwards through the forward-backward switching circuit according to the square-wave voltage signal. By adopting the speed-changing anti-blocking anti-jamming paper shredder, not only is the manufacturing cost low, but also the paper blocking can be prevented, and the working noise of the paper shredder can be lowered.

Description

technical field [0001] The invention relates to the technical field of shredders, in particular to a control method for a variable-speed anti-jamming shredder circuit and a shredder motor. Background technique [0002] The paper shredder is a kind of office equipment commonly used in the office. The paper shredder is a paper shredding device composed of a set of rotating blades, paper combs, motors, etc. When the paper shredder is working, the motor drives the blade to rotate to divide the paper into many small pieces of paper, so as to achieve the purpose of confidentiality. [0003] With the increasingly fierce competition in the paper shredder industry, in order to improve the competitiveness of paper shredders, paper shredder manufacturers are constantly looking for ways to improve the performance of paper shredders (such as: reduce the amount of noise) and reduce costs during the research and development process . [0004] Among them, the Chinese patent application nu...

AI Technical Summary

Problems solved by technology

[0007] (1) The intelligent speed-regulating shredder cannot realize the reverse control of the motor unit. When there are too many papers exceeding the maximum shredding capacity, paper jams are prone to occur, which affects work efficiency;

[0008] (2) Feedback the speed of the motor unit through the current sampling unit. In the internal programming process of the single-chip computer central processing system, it is necessary to find out the corresponding relationship between the current and the speed of the motor unit. However, under different voltages, the current and the speed correspond The relationship is different; the relationship between current and speed is different for different types of motor units, so it is necessary to find out the corresponding relationship between current and speed at each point. This will inevitably increase the complexity of programming, resulting in increased working time and reduced work efficiency; in addition , the load fed back by the current sampling signal is more difficult to control, which will cause the motor unit's speed to be unstable, and it is easy to cause high and low noise

[0009] (3) The phase angle speed control unit uses thyristor to adjust the speed of the motor unit. During the process of voltage adjustment by the thyristor, the voltage of the motor unit is relatively unstable, so it needs to be controlled by a zero-crossing detection sampling unit, which undoubtedly increases The complexity of the electrical control components increases the manufacturing cost of the intelligent speed-regulating shredder; in addition, the thyristor is used to adjust the voltage, and the thyristor is easily affected by the external power grid, so the resistance of the intelligent speed-regulating shredder Poor interference ability

Images