CN203329822U - Variable-speed anti-blocking shredder circuit - Google Patents
Variable-speed anti-blocking shredder circuit Download PDFInfo
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- CN203329822U CN203329822U CN2013202695415U CN201320269541U CN203329822U CN 203329822 U CN203329822 U CN 203329822U CN 2013202695415 U CN2013202695415 U CN 2013202695415U CN 201320269541 U CN201320269541 U CN 201320269541U CN 203329822 U CN203329822 U CN 203329822U
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Abstract
The utility model relates to the manufacture field of shredders and discloses a variable-speed anti-blocking shredder circuit. The variable-speed anti-blocking shredder circuit comprises a power circuit, a paper feeding sensing circuit, a forward rotating-backward rotating switching circuit, a rectifying circuit, a speed feedback circuit, a voltage speed governing circuit, an MCU (Main Control 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 outputting a square wave voltage signal representing the rotating speed of the motor to the MCU; the MCU is used for regulating the voltage of the motor through the voltage speed governing circuit according to the square wave voltage signal and controlling the motor to rotate forwardly or backwardly through the forward rotating-backward rotating switching circuit according to the square wave voltage signal. The variable-speed anti-blocking shredder circuit is low in manufacture cost, and also capable of preventing paper blockage and reducing the noise of the shredder during working.
Description
Technical field
The utility model relates to the shredder technical field, relates in particular to a kind of speed change anti-plugging circuit of paper crusher.
Background technology
Shredder is a kind of office office equipment commonly used, the chopping paper device that shredder is comprised of one group of blade rotated, paper comb, motor etc.During shredder work, motor drives the blade rotation that paper is divided into to a lot of tiny scraps of paper, thereby realizes secret purpose.
Along with the shredder industry competition is more and more fierce, in order to improve the competitiveness of shredder, the method that improves shredder performance (as: minimizing noise content) and reduce costs, in R&D process, is constantly sought by shredder manufacturer.
Wherein, the Chinese patent that application number is 201020172458.2 discloses a kind of Intelligent speed-adjusting paper shredder that can reduce noise, and this Intelligent speed-adjusting paper shredder comprises electric motor units, power supply, the current of electric sampling unit be connected with electric motor units, the one-chip computer central processing system be connected with the current sampling unit, the zero passage detection sampling unit be connected with the one-chip computer central processing system and the phase angle speed adjustment unit be connected with the one-chip computer central processing system.Wherein the phase angle speed adjustment unit is comprised of controllable silicon and triggering drive circuit thereof.
This Intelligent speed-adjusting paper shredder operation principle is as follows: the current of electric sampling unit carries out current sampling during to the electric motor units shredded paper, and sampled signal is delivered to the one-chip computer central processing system, the one-chip computer central processing system is processed computing after receiving current sampling signal, and by the phase angle speed adjustment unit, electric motor units is carried out to speed governing according to the result of computing, thereby reach energy-conservation and purpose noise-reducing.
Yet this Intelligent speed-adjusting paper shredder has the following disadvantages:
(1) this Intelligent speed-adjusting paper shredder can't be realized the reversion control of electric motor units, when paper too much exceeds maximum tatter amount, the situation of paperboard easily occurs, thereby affects operating efficiency;
(2) by the current sampling unit, the rotating speed to electric motor units is fed back, in one-chip computer central processing system inside programming process, need to find out the corresponding relation of electric current and electric motor units rotating speed, yet, under different voltage, electric current is different from the rotating speed corresponding relation; Dissimilar electric motor units, electric current is also different from rotation speed relation, will find out like this corresponding relation of each some electric current and rotating speed, so, must increase the complexity of programming, thereby causes the working time to increase, and operating efficiency reduces; In addition, the more difficult control of duty factor of current sampling signal feedback, can cause the rotating speed of electric motor units not steady, low when high while easily causing noise.
(3) the phase angle speed adjustment unit is to adopt controllable silicon to carry out the adjusting of electric motor units rotating speed, and in controllable silicon regulation voltage process, the voltage of electric motor units is more unstable, need to control with the zero passage detection sampling unit, this increases the complexity of electric controling part undoubtedly, thereby makes the manufacturing cost of Intelligent speed-adjusting paper shredder increase; In addition, adopt controllable silicon to carry out the regulation voltage adjusting, controllable silicon easily is subject to extraneous electric network influencing, therefore make the antijamming capability of Intelligent speed-adjusting paper shredder poor.
The utility model content
The utility model purpose is to solve the existing deficiency of shredder, proposes a kind of not only low cost of manufacture but also can prevent that paper from stopping up and the speed change anti-plugging circuit of paper crusher of noise can reduce shredder work the time.
The utility model provides a kind of speed change anti-plugging circuit of paper crusher, and it comprises: power circuit, enter paper sensor circuit, rotating commutation circuit, rectification circuit, velocity feedback circuits, adjusting velocity by voltage circuit, MCU and direct current generator;
Described power circuit is connected with external ac power source, for described, enter paper sensor circuit, described rotating commutation circuit, described velocity feedback circuits and described MCU required power supply is provided;
Describedly enter the paper sensor circuit and be connected with described MCU, describedly enter the paper inlet that the paper sensor circuit is installed on shredder;
Described rotating commutation circuit is connected with described direct current generator;
Described rectification circuit is connected with described direct current generator, for external ac power source being converted to dc source and offering described direct current generator;
The input of described adjusting velocity by voltage circuit is connected with described MCU, and the output of described adjusting velocity by voltage circuit is connected with described direct current generator;
The input of described velocity feedback circuits is connected with described direct current generator, the output of described velocity feedback circuits is connected with described MCU, the square wave voltage signal that described velocity feedback circuits is used for exporting the described DC motor speed of sign is to described MCU, and described MCU is used for according to described square wave voltage signal through the voltage of the described direct current generator of described adjusting velocity by voltage circuit adjustment and for according to described square wave voltage signal, through described rotating commutation circuit, controlling described direct current generator forward or reverse.
Compared with prior art, the beneficial effects of the utility model are:
(1) the utility model Negotiation speed feedback circuit, adjusting velocity by voltage circuit and MCU cooperatively interact, realize the adjusting of DC motor speed, make shredder when load less (few paper or without paper), the rotating speed of direct current generator can reduce, thereby the high noisy of avoiding direct current generator to produce because rotating speed is too high, and energy-conserving and environment-protective.
(2) output of Negotiation speed feedback circuit characterizes the square wave voltage signal of described DC motor speed and is delivered to described MCU, thereby make MCU can calculate the rotating speed of direct current generator, MCU judges according to this rotating speed whether load capacity exceeds the ultimate load that direct current generator can bear, if exceed, MCU controls the direct current generator reversion and moves back paper, thereby avoids the situation of paperboard.
(3) the utility model adopts direct current generator as power source, the direct current generator low price, thus be conducive to reduce the manufacturing cost of shredder.
(4) the utility model adopts velocity feedback circuits as feedback, not only is conducive to simplify the process of MCU inside programming, and can makes the rotating speed of direct current generator more steady, and noise control obtains lower.
The accompanying drawing explanation
The theory diagram that Fig. 1 is the utility model speed change anti-plugging circuit of paper crusher;
Fig. 2 is the utility model speed change anti-plugging circuit of paper crusher figure;
The timing waveform that Fig. 3 is the utility model MCU and adjusting velocity by voltage circuit output voltage.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited to this.
Please refer to Fig. 1 to Fig. 3, the utility model provides a kind of anti-plugging of the speed change for shredder circuit of paper crusher, it comprises: power circuit 1, enter paper sensor circuit 2, rotating commutation circuit 3, rectification circuit 4, velocity feedback circuits 5, adjusting velocity by voltage circuit 6, MCU (Micro Controller Unit, Chinese is micro-control unit) 7, direct current generator 8, protective tube F1, power switch K1, fiber drum K switch 2 and the plug K3 for being connected with external power source.
Described power circuit 1 is connected with external ac power source by plug K3, and described power circuit 1 is comprised of the transformer T1 for reducing voltage, connection plug-in unit J5, connection plug-in unit J6, diode D6, diode D7, diode D8, diode D9, capacitor C 2, capacitor C 5, capacitor C 6, capacitor C 7, capacitor C 8, capacitor C 9, resistance R 16 and voltage-stabiliser tube U1.Resistance R 16 and capacitor C 9 contact place output 18V voltages, for offering adjusting velocity by voltage circuit 6; Resistance R 16 and capacitor C 5 contact place output 12V voltages, for offering rotating commutation circuit 3; Voltage-stabiliser tube U1 and capacitor C 6 contact place output 5V voltages, be fed into paper sensor circuit 2 and velocity feedback circuits 5 for providing.
Describedly enter paper sensor circuit 2 and be connected with described MCU7, describedly enter the paper feed port that paper sensor circuit 2 is installed on shredder, it is comprised of infrared emission receiving tube L, connection plug-in unit J2, resistance R 2, resistance R 3, resistance R 4 and resistance R 5, when paper enters paper feed port, the infrared emission receiving tube is connected whole speed change anti-plugging circuit of paper crusher, thereby starts direct current generator 8 operations.
Described rotating commutation circuit 3 is connected with described direct current generator 8, and described rotating commutation circuit 3 comprises the relay Y1 for controlling described direct current generator 8 forwards, the forward drive circuit 9 be connected with relay Y1, for the relay Y2 that controls described direct current generator 8 reversions and the reversing drive circuit 10 be connected with relay Y2.Wherein, described forward drive circuit 9 is comprised of triode Q1 and the diode D1 be connected with triode Q1 respectively, resistance R 6, resistance R 8, when triode Q1 conducting, and relay Y1 conducting, direct current generator 8 forwards operations; Described reversing drive circuit 10 is by triode Q2 and with triode Q2 connecting band diode D2, resistance R 9, resistance R 10, form respectively, when triode Q2 conducting, and relay Y2 conducting, direct current generator 8 reversion operations.
Described rectification circuit 4 is connected with described direct current generator 8, for external ac power source being converted to dc source and offering described direct current generator 8.
The input of described velocity feedback circuits 5 is connected with described direct current generator 8, the output of described velocity feedback circuits 5 is connected with described MCU7, in the present embodiment, described velocity feedback circuits 5 is by connecting plug-in unit J1, Hall element U1881, and resistance R 1, capacitor C 1 and the magnet that is arranged on the bar shaped in the rotating shaft of described direct current generator 8 form.The operation principle of described velocity feedback circuits 5 is as follows: when the rotating shaft of direct current generator 8 is rotated, magnet rotates along with the rotating shaft of described direct current generator 8, now, the variation magnetic field output that Hall element U1881 produces while rotating according to described magnet characterizes the square wave voltage signal of described direct current generator 8 rotating speeds to MCU7, after MCU7 receives this square-wave voltage signal, get final product the pulse width that computing draws this square-wave voltage signal, for being contrasted with MCU inner setting value, thereby regulate the voltage of direct current generator 8 according to comparison result, thereby reach the adjusting of direct current generator 8 rotating speeds.
The input of described adjusting velocity by voltage circuit 6 is connected with described MCU7, and the output of described alignment circuit 6 is connected with described direct current generator 8.In the present embodiment, adjusting velocity by voltage circuit 6 is by insulated gate bipolar transistor Q3(Insulated Gate Bipolar Transistor, be called for short IGBT) and drive circuit (not label) composition, in other embodiments, insulated gate bipolar transistor Q3 can use MOSFET crystal (Metal-Oxide-Semiconductor Field-Effect Transistor is called for short MOSFET) or Darlington transistor to replace.
Described drive circuit is comprised of triode Q4, triode Q5, triode Q6, voltage-stabiliser tube Z1, resistance R 11, resistance R 12, resistance R 13, resistance R 14 and R15.The emitter stage of described triode Q4 is connected with the emitter stage of described triode Q6, and the base stage of described triode Q4 is connected with the base stage of described triode Q6; The colelctor electrode of described triode Q5 is connected with the base stage of described triode Q4; The positive pole of described voltage-stabiliser tube Z1 is connected with the grid of described insulated gate bipolar transistor Q3 respectively and the emitter stage of described triode Q4 connects.Described voltage-stabiliser tube Z1, for the voltage of stable insulation grid bipolar transistor Q3, makes the voltage of insulated gate bipolar transistor Q3 can not exceed 18V, and avoids insulated gate bipolar transistor Q3 to damage.
The operation principle of described drive circuit is as follows: when the MCU7 output low level, and triode Q5 cut-off, the 18V voltage that power circuit 1 provides is added to the base stage of triode Q4 by resistance R 12, make triode Q4 and insulated gate bipolar transistor Q3 conducting; When MCU7 output high level, triode Q5 base stage has electric current to flow into and conducting, during triode Q5 conducting, the colelctor electrode level of triode Q5 is 0.2V, triode Q4 base voltage is that 0.2V can not conducting, and triode Q6 conducting, now, insulated gate bipolar transistor Q3 grid, by triode Q6 electric discharge, makes insulated gate bipolar transistor Q3 cut-off.
While being below load value less (few paper or without paper), the course of work that the DC motor speed of the utility model speed change anti-plugging circuit of paper crusher is regulated:
After entering paper sensor circuit 2 and receiving the enabled instruction of paper feed port that paper enters shredder, this enabled instruction is input to MCU7, MCU7 receives the rotating shaft of controlling direct current generator 8 after this enabled instruction and rotates, when the rotating shaft of direct current generator 8 is rotated, magnet rotates along with the rotating shaft of described direct current generator 8, the variation magnetic field output produced when now Hall element rotates according to described magnet characterizes the square wave voltage signal of described direct current generator 8 rotating speeds to MCU7, after MCU7 receives this square-wave voltage signal, computing draws the pulse width of this square-wave voltage signal and is contrasted with MCU inner setting value, if pulse width is less than MCU7 inner setting value, illustrate that direct current generator 8 rotating ratio MCU7 desired speeds are high, now, MCU exports the adjustable pulse width modulating signal of certain dutycycle to described adjusting velocity by voltage circuit 6, described adjusting velocity by voltage circuit 6 reduces the voltage of described direct current generator 8 according to pulse width modulating signal, thereby make the rotating speed of direct current generator 8 identical with MCU7 internal processes preset rotation speed, thereby realize direct current generator 8 rotating speeds relatively constant (keeping the MCU preset rotation speed), while avoiding direct current generator 8 at few paper or without paper, rotating speed accelerates and the high noisy that causes.
Please refer to Fig. 3, V1 is the timing waveform of the pulse width modulating signal of MCU7 output, and V2 is the timing waveform of adjusting velocity by voltage circuit 6 output voltage signals, (being added to the voltage on direct current generator).
Pulse width modulating signal is during t1-t2, and voltage is the 0V(low level) time, triode Q5, triode Q6 cut-off, triode Q4 conducting, thereby insulated gate bipolar transistor Q3 conducting, direct current generator 8 energising work, when pulse width modulating signal, during t2-t3, voltage is the 5V(high level) time, triode Q5, triode Q6 conducting, triode Q4 cut-off, thereby insulated gate bipolar transistor Q3 cut-off, direct current generator 8 cut-off no powers.In actual application, as required as long as a variable duty ratio pulse width modulating signal of MCU7 output just can be controlled the ON time of direct current generator 8, thereby control the voltage of direct current generator 8, reach the purpose of speed governing.
While being below load value large (paper is more), the course of work of paper is moved back in the direct current generator reversion of the utility model speed change anti-plugging circuit of paper crusher:
When load value is larger, the pulse width of the square wave voltage signal that the MCU7 computing draws can be greater than MCU7 inner setting value, now illustrate that direct current generator 8 rotating ratio MCU7 desired speeds are low (because MCU output pulse width modulation signal does not change, therefore DC motor speed can be slack-off), now MCU improves the voltage of described direct current generator 8 by adjusting velocity by voltage circuit 6, make the rotating speed of direct current generator 8 identical with MCU7 internal processes desired speed, when this voltage has been adjusted to maximum voltage 220V, when if the rotating speed of direct current generator 8 still is less than MCU7 internal processes desired speed, MCU7 moves back paper by relay Y2 control direct current generator 8 reversions of rotating commutation circuit 3, thereby avoid load capacity due to paper to exceed the ultimate load that direct current generator 8 can bear and cause paperboard.
In sum, the beneficial effects of the utility model are:
(1) the utility model Negotiation speed feedback circuit, adjusting velocity by voltage circuit and MCU cooperatively interact, realize the adjusting of DC motor speed, make shredder when load less (few paper or without paper), the rotating speed of direct current generator can reduce, thereby the high noisy of avoiding direct current generator to produce because rotating speed is too high, and energy-conserving and environment-protective.
(2) output of Negotiation speed feedback circuit characterizes the square wave voltage signal of described DC motor speed and is delivered to described MCU, thereby make MCU can calculate the rotating speed of direct current generator, thereby make when load capacity exceeds the ultimate load that direct current generator can bear, control the direct current generator reversion and move back paper, avoid the situation of paperboard.
(3) the utility model adopts direct current generator as power source, the direct current generator low price, thus be conducive to reduce the manufacturing cost of shredder.
(4) the utility model adopts velocity feedback circuits as feedback, in MCU inside programming process, only need preset as required the rotating speed of direct current generator, do not need to find out the corresponding relation of electric current and motor speed, thereby be conducive to simplify the process of MCU inside programming, increase work efficiency; In addition, adopt velocity feedback circuits can make the rotating speed of direct current generator more steady as feedback, make noise less, noise can reduce by 10 decibels of left and right.
(5) the utility model adopts insulated gate bipolar transistor to realize the adjusting of the voltage of direct current generator, its adjustment process voltage stabilization, and without using zero cross detection circuit, thereby be conducive to simplify circuit, reduce manufacturing cost; In addition, because the voltage of insulated gate bipolar transistor output is only relevant with the dutycycle of the pulse width modulating signal of MCU output, irrelevant with external power grid, thus be conducive to improve the antijamming capability of whole speed change anti-plugging circuit of paper crusher.
Above-described embodiment is preferably embodiment of the utility model; but embodiment of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection domain of the present utility model.
Claims (5)
1. a speed change anti-plugging circuit of paper crusher, is characterized in that, comprising: power circuit, enter paper sensor circuit, rotating commutation circuit, velocity feedback circuits, alignment circuit, MCU and motor;
Described power circuit is connected with external ac power source, for described, enter paper sensor circuit, described rotating commutation circuit, described velocity feedback circuits and described MCU required power supply is provided;
Describedly enter the paper sensor circuit and be connected with described MCU, describedly enter the paper inlet that the paper sensor circuit is installed on shredder;
Described rotating commutation circuit is connected with described motor;
The input of described adjusting velocity by voltage circuit is connected with described MCU, and the output of described adjusting velocity by voltage circuit is connected with described motor;
The input of described velocity feedback circuits is connected with described motor, the output of described velocity feedback circuits is connected with described MCU, the square wave voltage signal that described velocity feedback circuits is used for exporting the described motor speed of sign is to described MCU, and described MCU is used for according to described square wave voltage signal through the voltage of the described motor of described adjusting velocity by voltage circuit adjustment and for according to described square wave voltage signal, through described rotating commutation circuit, controlling described direct current generator forward or reverse.
2. speed change anti-plugging circuit of paper crusher according to claim 1, it is characterized in that: described motor is direct current generator, described speed change anti-plugging circuit of paper crusher also has rectification circuit, described rectification circuit is connected with described direct current generator, for external ac power source being converted to dc source and offering described direct current generator, described velocity feedback circuits has Hall element and is arranged on the magnet in the rotating shaft of described direct current generator, when the rotating shaft of described direct current generator is rotated, described magnet rotates along with the rotating shaft of described direct current generator, the variation magnetic field output that described Hall element produces while rotating according to described magnet characterizes the square wave voltage signal of described DC motor speed to described MCU, after MCU receives this square-wave voltage signal, computing draws the pulse width of this square-wave voltage signal and is contrasted with MCU inner setting value, if pulse width is less than or greater than setting value, MCU exports the pulse width modulating signal of certain dutycycle to described adjusting velocity by voltage circuit, described adjusting velocity by voltage circuit is regulated the voltage of described direct current generator according to pulse width modulating signal, thereby realize the adjusting of the rotating speed of described direct current generator.
3. speed change anti-plugging circuit of paper crusher according to claim 2, it is characterized in that: a kind of and drive circuit of described adjusting velocity by voltage circuit in insulated gate bipolar transistor, metal-oxide half field effect transistor or Darlington transistor forms.
4. speed change anti-plugging circuit of paper crusher according to claim 3, it is characterized in that: described drive circuit comprises triode Q4, triode Q5, triode Q6 and voltage-stabiliser tube Z1, the emitter stage of described triode Q4 is connected with the emitter stage of described triode Q6, and the base stage of described triode Q4 is connected with the base stage of described triode Q6; The colelctor electrode of described triode Q5 is connected with the base stage of described triode Q4; The positive pole of described voltage-stabiliser tube Z1 is connected with the grid of described insulated gate bipolar transistor respectively and the emitter stage of described triode Q4 connects.
5. speed change anti-plugging circuit of paper crusher according to claim 2 is characterized in that: described rotating commutation circuit comprises the relay Y1 for controlling described direct current generator forward, the forward drive circuit be connected with relay Y1, for the relay Y2 that controls described direct current generator reversion and the reversing drive circuit be connected with relay Y2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202695415U CN203329822U (en) | 2013-05-10 | 2013-05-16 | Variable-speed anti-blocking shredder circuit |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320255824.4 | 2013-05-10 | ||
| CN201320255824 | 2013-05-10 | ||
| CN2013202695415U CN203329822U (en) | 2013-05-10 | 2013-05-16 | Variable-speed anti-blocking shredder circuit |
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| CN203329822U true CN203329822U (en) | 2013-12-11 |
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| CN2013202695415U Expired - Lifetime CN203329822U (en) | 2013-05-10 | 2013-05-16 | Variable-speed anti-blocking shredder circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103301925A (en) * | 2013-05-10 | 2013-09-18 | 广州科密股份有限公司 | Speed-changing anti-blocking anti-jamming paper shredder circuit and control method of motor thereof |
| CN104113244A (en) * | 2014-05-06 | 2014-10-22 | 宁波王兴工艺品有限公司 | Noise-reduction shredder circuit and control method |
| CN106341059A (en) * | 2016-09-28 | 2017-01-18 | 深圳怡化电脑股份有限公司 | Signal processing method and apparatus |
-
2013
- 2013-05-16 CN CN2013202695415U patent/CN203329822U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103301925A (en) * | 2013-05-10 | 2013-09-18 | 广州科密股份有限公司 | Speed-changing anti-blocking anti-jamming paper shredder circuit and control method of motor thereof |
| CN104113244A (en) * | 2014-05-06 | 2014-10-22 | 宁波王兴工艺品有限公司 | Noise-reduction shredder circuit and control method |
| CN106341059A (en) * | 2016-09-28 | 2017-01-18 | 深圳怡化电脑股份有限公司 | Signal processing method and apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: GUANGZHOU SUNSHINE COMET ELECTRONIC TECHNOLOGY CO.,LTD. Assignor: Guangzhou Comet Co.,Ltd. Contract record no.: 2016440000131 Denomination of utility model: Speed-changing anti-blocking anti-jamming paper shredder circuit and control method of motor thereof Granted publication date: 20131211 License type: Exclusive License Record date: 20160816 |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131211 |