CN116545302A - Control circuit and pencil sharpening device - Google Patents

Control circuit and pencil sharpening device Download PDF

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Publication number
CN116545302A
CN116545302A CN202310301471.5A CN202310301471A CN116545302A CN 116545302 A CN116545302 A CN 116545302A CN 202310301471 A CN202310301471 A CN 202310301471A CN 116545302 A CN116545302 A CN 116545302A
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CN
China
Prior art keywords
circuit
sub
switching tube
switch
pencil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310301471.5A
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Chinese (zh)
Inventor
黄有良
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongguan Haishu Electronic Technology Co ltd
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Dongguan Haishu Electronic Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dongguan Haishu Electronic Technology Co ltd filed Critical Dongguan Haishu Electronic Technology Co ltd
Priority to CN202310301471.5A priority Critical patent/CN116545302A/en
Publication of CN116545302A publication Critical patent/CN116545302A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L23/00—Sharpeners for pencils or leads
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Abstract

The application discloses control circuit and pencil sharpening equipment relates to the technical field of pencil sharpening, and control circuit includes power supply electronic circuit, first touch switch P6, first sub-circuit, second sub-circuit and third sub-circuit, and when pencil sharpening equipment did not finish sharpening, first touch switch was closed for first sub-circuit switched on, the second sub-circuit was cut off, thereby makes the third sub-circuit switch on, consequently power supply electronic circuit can give the motor power supply, so that the motor can normally operate, and pencil sharpening equipment can normally cut the pencil. When the pencil sharpening equipment finishes sharpening, namely, when the pencil is cut to leak the nib, the pencil touches the first touch switch, so that the first touch switch is disconnected, the first sub-circuit is cut off, the second sub-circuit is conducted, and therefore the third sub-circuit is cut off, the power supply sub-circuit cannot supply power to the motor, so that the motor stops running, the pencil sharpening equipment stops sharpening, excessive cutting of the pencil is avoided, the control circuit does not need to adopt a micro-processor, the response is fast, and the cost can be reduced.

Description

Control circuit and pencil sharpening device
Technical Field
The application relates to the technical field of pencil sharpening, in particular to a control circuit and pencil sharpening equipment.
Background
The automatic pencil sharpener is a tool capable of realizing automatic pencil sharpening. In the related art, a part of the automatic pencil sharpener can judge whether the pencil is cut.
However, the automatic pencil sharpener in the related art needs a controller to judge whether the pencil is cut, programming is performed on the controller, the pencil sharpening state is monitored through the controller and a circuit, the automatic pencil sharpener is stopped when the pencil sharpening is judged to be finished, the controller is generally a micro-processor such as a single chip microcomputer, the cost is high, and the signal transmission time of the micro-processor is long, so that the response speed is slow.
Disclosure of Invention
The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides a control circuit and pencil sharpening equipment, can judge that pencil cutting is accomplished to make the motor stop operation when pencil cutting is accomplished, avoid the pencil to be excessively cut, and the circuit need not to adopt microprocessor, and the circuit response rate is fast, and can save the cost.
The control circuit according to the embodiment of the first aspect of the present application is applied to a pencil sharpening device including a motor for sharpening pencil; the control circuit includes:
the power supply electronic circuit is connected with the motor;
the first touch switch is grounded, and the first touch switch is a normally closed switch;
the first sub-circuit is connected with the power supply sub-circuit, and the first sub-circuit is connected with the second end of the first touch switch;
the second sub-circuit is connected with the first sub-circuit and is also connected with the second end of the first touch switch;
the third sub-circuit is connected with the first sub-circuit and the second sub-circuit respectively, and is also connected with the motor;
the first touch switch is used for being opened when the pencil sharpening of the pencil sharpening device is completed, and the first touch switch is used for enabling the first sub-circuit to be on and enabling the second sub-circuit to be off when the first touch switch is closed; the first touch switch is also used for enabling the first sub-circuit to be cut off and enabling the second sub-circuit to be conducted when the first touch switch is disconnected;
the third sub-circuit is used for conducting between the power supply circuit and the motor when the first sub-circuit is conducted and the second sub-circuit is cut off, so that the power supply circuit supplies power to the motor; the third sub-circuit is further configured to turn off between the power supply circuit and the motor when the second sub-circuit is turned on.
The control circuit according to the embodiment of the first aspect of the embodiment of the application has at least the following advantages: when the pencil sharpening device does not finish sharpening, the first touch switch is in a closed state, so that the first sub-circuit is conducted, the second sub-circuit is cut off, and the third sub-circuit is conducted, and therefore the power supply sub-circuit can supply power to the motor, the motor can normally operate, and the pencil sharpening device can normally perform pencil sharpening. When the pencil is cut by the pencil sharpening device, namely, when the pencil is cut to the leaked pencil point, the pencil touches the first touch switch, so that the first touch switch is disconnected, the first sub-circuit is cut off, the second sub-circuit is conducted, and therefore the third sub-circuit is cut off, the power supply sub-circuit cannot supply power to the motor, so that the motor stops running, the pencil sharpening device stops sharpening, excessive cutting of the pencil is avoided, and the control circuit does not need to adopt a micro-processor, so that the circuit is simple, the cost can be reduced, and in a pure electric circuit structure, the signal transmission rate is faster than that of the micro-processor, and therefore, the circuit response rate of the embodiment of the application is fast.
According to some embodiments of the present application, the first sub-circuit includes a first switching tube, a first end of the first switching tube is connected to the electronic circuit, a control end of the first switching tube is connected to a second end of the first touch switch, and a second end of the first switching tube is connected to the second sub-circuit; the first switch tube is used for being conducted when the first touch switch is closed, and being cut off when the first touch switch is opened.
According to some embodiments of the present application, the second sub-circuit includes a second switching tube, a first resistor, a second resistor, and a third resistor, where a first end of the second switching tube is connected to a second end of the first switching tube through the first resistor, a second end of the second switching tube is grounded through the second resistor, a second end of the second switching tube is grounded, a control end of the second switching tube is connected to the power supply circuit through the third resistor, and a second end of the first touch switch is connected between a control end of the second switching tube and the third resistor; the second switch tube is used for being turned off when the first touch switch is turned on when the first touch switch is turned off.
According to some embodiments of the present application, the third sub-circuit includes a third switching tube, a first end of the third switching tube is grounded, a second end of the third switching tube is connected with the motor, a control end of the third switching tube is connected with a first end of the second switching tube, the third switching tube is used for being turned on when the first switching tube is turned on and the second switching tube is turned off, and the third switching tube is used for being turned off when the second switching tube is turned on, and the third switching tube is used for enabling the power supply circuit to supply power to the motor when the third switching tube is turned on.
According to some embodiments of the application, the second sub-circuit further includes a first capacitor, and the control end of the second switch tube is grounded through the first capacitor and the third resistor.
According to some embodiments of the present application, the electronic circuit further comprises a start switch, and the first sub-circuit and the electronic circuit are connected through the start switch.
According to some embodiments of the present application, the first sub-circuit is connected to the start switch through the temperature protection switch.
According to some embodiments of the present application, further comprising a charging sub-circuit, the power supply sub-circuit comprising a battery;
the charging sub-circuit comprises a charging module, wherein the voltage input end of the charging module is used for being connected with an external power supply, and the output end of the charging module is connected with the battery.
According to some embodiments of the present application, the electronic circuit further comprises an indication sub-circuit, the indication sub-circuit comprises a second light emitting diode, a first light emitting diode, a fourth switch tube and a fourth resistor, a control end of the fourth switch tube is connected with the first sub-circuit through the fourth resistor, a first end of the fourth switch tube is grounded, a second end of the fourth switch tube is connected with an output end of the second light emitting diode, an input end of the second light emitting diode is connected with an input end of the first light emitting diode, an output end of the first light emitting diode is connected with an indication end of the charging module which is being charged, an input end of the second light emitting diode is connected with the power supply circuit, and an output end of the second light emitting diode is also connected with a charge completion indication end of the charging module.
A pencil sharpener according to an embodiment of the second aspect of the present application comprises a control circuit as in any one of the embodiments of the first aspect.
The pencil sharpener according to the second aspect of the embodiment of the present application has at least the following advantages: all the advantageous effects of the control circuit including the embodiment of the first aspect are not described here in detail.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The application is further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic circuit diagram of a control circuit according to an embodiment of the present application;
fig. 2 is a circuit schematic diagram of a charging sub-circuit of the control circuit according to an embodiment of the present application.
Reference numerals:
a second sub-circuit 100; an indicator sub-circuit 200; a first touch switch P6; starting a switch P5; a temperature protection switch P3; a battery P1; a charging module U1; a motor P2; a first switching tube Q4; a second switching tube Q2; a third switching tube Q1; a fourth switching tube Q3; a first resistor R7; a second resistor R8; a third resistor R9; a fourth resistor R4; a first light emitting diode LED1; a second light emitting diode LED2; a first capacitor C5; the diode D2 is protected.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it should be understood that references to orientation descriptions, such as directions of up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
In the description of the present application, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present application, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present application can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical solution.
In the description of the present application, a description with reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the related art, a part of automatic pencil sharpener can judge whether pencil sharpening is finished, a touch switch in communication connection with a controller is arranged in the automatic pencil sharpener, when pencil sharpening is finished, a pen point of the pencil touches the touch switch, and the touch switch sends a signal to the controller so that the controller controls the automatic pencil sharpener to stop running. However, the automatic pencil sharpener in the related art needs a controller to judge whether the pencil is cut, and stops the automatic pencil sharpener when the pencil is cut, so that a circuit is complex, the controller is a micro-processor such as a single chip microcomputer generally, the cost is high, and compared with a pure circuit structure, the micro-processor needs longer time for signal transmission, so that the response speed is slower. Based on this, this application embodiment provides a control circuit, and cuts equipment, can judge that pencil cutting is accomplished to make the motor stop operation when pencil cutting is accomplished, avoid the pencil to be cut excessively, and the circuit need not to adopt microprocessor, and the circuit response rate is fast, and can save the cost.
Referring to fig. 1, a control circuit according to an embodiment of a first aspect of the present application is applied to a pencil sharpening device including a motor P2 for sharpening pencil; the control circuit includes a power supply sub-circuit, a first touch switch P6, a first sub-circuit, a second sub-circuit 100, and a third sub-circuit.
The power supply electronic circuit is connected with the motor P2;
the first touch switch P6, the first end of the first touch switch P6 is grounded, and the first touch switch P6 is a normally closed switch;
the first sub-circuit is connected with the electronic circuit and is connected with the second end of the first touch switch P6;
the second sub-circuit 100, the second sub-circuit 100 is connected with the first sub-circuit, the second sub-circuit 100 is also connected with the second end of the first touch switch P6;
the third sub-circuit is respectively connected with the first sub-circuit and the second sub-circuit 100 and is also connected with the motor;
the first touch switch P6 is used for being opened when the pencil sharpening of the pencil sharpening device is completed, and the first touch switch P6 is used for enabling the first sub-circuit to be turned on and enabling the second sub-circuit 100 to be turned off when the pencil sharpening device is closed; the first touch switch P6 is further configured to turn off the first sub-circuit and turn on the second sub-circuit 100 when turned off;
the third sub-circuit is used for conducting between the power supply sub-circuit and the motor when the first sub-circuit is conducted and the second sub-circuit is cut off, so that the power supply sub-circuit supplies power to the motor P2; the third sub-circuit is also used to turn off the power supply sub-circuit from the motor P2 when the second sub-circuit is turned on.
When the pencil sharpening device does not finish sharpening, the first touch switch P6 is in a closed state, so that the first sub-circuit is conducted, the second sub-circuit 100 is cut off, and the third sub-circuit is conducted, and therefore the power supply sub-circuit can supply power to the motor P2, the motor P2 can normally operate, and the pencil sharpening device can normally perform pencil sharpening. When the pencil sharpening device finishes sharpening, that is, when the pencil is cut to leak the pencil point, the pencil touches the first touch switch P6, so that the first touch switch P6 is disconnected, the first sub-circuit is turned off, the second sub-circuit 100 is turned on, and therefore the third sub-circuit is turned off, the power supply sub-circuit cannot supply power to the motor P2, and the motor P2 stops running.
The control circuit according to the embodiment of the first aspect of the application has at least the following advantages:
first, when the pencil is cut by the pencil sharpening device until the pencil point leaks, and the pencil point of the pencil touches the first touch switch P6, so that the touch switch is disconnected, the pencil sharpening device stops sharpening, and excessive cutting of the pencil is avoided.
Secondly, although the related art can stop sharpening the pencil by the pencil sharpening device when the pencil point of the pencil touches the touch switch, the related art needs to be processed by adopting a micro processor, and the control circuit of the embodiment of the application does not need to adopt the micro processor, so that the cost can be reduced.
Third, compare with the circuit that adopts microprocessor, the control circuit of this application adopts pure electric circuit device, and signal transmission rate is faster than microprocessor, therefore the control circuit response rate of this application embodiment is fast.
It can be understood that the first sub-circuit includes a first switch tube Q4, a first end of the first switch tube Q4 is connected to the electronic circuit, a control end of the first switch tube Q4 is connected to a second end of the first touch switch P6, and a second end of the first switch tube Q4 is connected to the second sub-circuit 100; the first switch Q4 is configured to be turned on when the first touch switch P6 is turned on, and turned off when the first touch switch P6 is turned off.
It can be understood that the second sub-circuit 100 includes a second switch tube Q2, a first resistor R7, a second resistor R8, and a third resistor R9, where a first end of the second switch tube Q2 is connected to a second end of the first switch tube Q4 through the first resistor R7, a second end of the second switch tube Q2 is grounded through the second resistor R8, a second end of the second switch tube Q2 is grounded, a control end of the second switch tube Q2 is connected to the power supply circuit through the third resistor R9, and a second end of the second touch switch P6 is connected between the control end of the second switch tube Q2 and the third resistor R9; the second switch Q2 is configured to be turned off when the first touch switch P6 is turned on, and turned on when the first touch switch P6 is turned off.
It may be understood that the third sub-circuit includes a third switching tube Q1, a first end of the third switching tube Q1 is grounded, a second end of the third switching tube Q1 is connected to the motor P2, a control end of the third switching tube Q1 is connected to a first end of the second switching tube Q2, the third switching tube Q1 is configured to be turned on when the first switching tube Q4 is turned on and the second switching tube Q2 is turned off, and the third switching tube Q1 is configured to be turned off when the second switching tube Q2 is turned on, and the third switching tube Q1 is configured to enable the power supply sub-circuit to supply power to the motor P2 when turned on.
In some embodiments, referring to fig. 1, the electronic circuit includes a battery P1. The first switch tube Q4 adopts a P-channel field effect tube, the first end of the first switch tube Q4 is the source electrode of the P-channel field effect tube, the second end of the first switch tube Q4 is the drain electrode of the P-channel field effect tube, and the control end of the first switch tube Q4 is the grid electrode of the P-channel field effect tube. The second switching tube Q2 adopts an N-channel field effect tube, the first end of the second switching tube Q2 is the drain electrode of the N-channel field effect tube, the second end of the second switching tube Q2 is the source electrode of the N-channel field effect tube, and the control end of the second switching tube Q2 is the grid electrode of the N-channel field effect tube. The third switching tube Q1 adopts an N-channel field effect tube, the first end of the third switching tube Q1 is a source electrode of the N-channel field effect tube, the second end of the third switching tube Q1 is a drain electrode of the N-channel field effect tube, and the control end of the third switching tube Q1 is a grid electrode of the N-channel field effect tube.
The source electrode of the first switching tube Q4 is connected with the positive electrode of the battery P1, the grid electrode of the first switching tube Q4 is connected with the second end of the first touch switch P6, the drain electrode of the first switching tube Q4 is connected with the drain electrode of the second switching tube Q2 through a first resistor R7, the drain electrode of the second switching tube Q2 is grounded through a second resistor R8, the source electrode of the second switching tube Q2 is grounded, the grid electrode of the second switching tube Q2 is connected with the positive electrode of the battery P1 through a third resistor R9, and the second end of the first touch switch P6 is connected between the grid electrode of the second switching tube Q2 and the third resistor R9. The source electrode of the third switching tube Q1 is grounded, the drain electrode of the third switching tube Q1 is connected with the negative electrode end of the motor P2, the positive electrode end of the motor P2 is connected with the positive electrode of the battery P1, and the grid electrode of the third switching tube Q1 is connected with the drain electrode of the second switching tube Q2.
When the pencil sharpening device does not finish pencil sharpening, the first touch switch P6 is in a closed state, so that the second end of the first touch switch P6 is grounded, namely the DELAY level in the graph 1 is low, namely the grid electrode of the first switch tube Q4 is low, and the first switch tube Q4 is conducted; and the grid of the second switch tube Q2 is at a low level, the second switch tube Q2 is cut off, and the grid of the third switch tube Q1 is at a high level at the partial pressure of the first resistor R7 and the second resistor R8, so that the third switch tube Q1 is conducted, the negative electrode end of the motor P2 can be grounded through the third switch tube Q1, the battery P1 can supply power to the motor P2, the motor P2 can normally operate, and the pencil sharpening equipment can normally perform pencil sharpening.
When the pencil sharpening device finishes sharpening, that is, when the pencil is sharpened to leak the pencil point, the pencil touches the first touch switch P6, so that the first touch switch P6 is turned off, and since the grid electrode of the second switching tube Q2 is connected to the positive electrode of the battery P1 through the third resistor R9, and the second end of the first touch switch P6 is connected between the grid electrode of the second switching tube Q2 and the third resistor R9, the DELAY level in fig. 1 is high, the grid electrode of the first switching tube Q4 is high, the first switching tube Q4 is turned off, the grid electrode of the second switching tube Q2 is high, the second switching tube Q2 is turned on, the drain electrode of the second switching tube Q2 is low, the grid electrode of the third switching tube Q1 is low, the third switching tube Q1 is turned off, and the negative electrode end of the motor P2 cannot be grounded, so that the motor P2 stops running.
It is noted that, in the embodiment of the present application, the third switching tube Q1 is turned off by the second switching tube Q2, so as to protect the third switching tube Q1. Specifically, when the first touch switch P6 is turned off, the DELAY level changes from a low level to a high level, and the first switching tube Q4 is turned off, so that the START3 in fig. 1 is not at a level, and since the gate of the third switching tube Q1 is grounded through the second resistor R8, during practical application, the gate of the third switching tube Q1 cannot quickly change from the high level to the low level under the action of the second resistor R8, and therefore the third switching tube Q1 may be damaged, in this case, when the DELAY level changes from the low level to the high level through the second switching tube Q2, the second switching tube Q2 is turned on immediately, so that the gate of the third switching tube Q1 is grounded through the second switching tube Q2, and the gate of the third switching tube Q1 can quickly change from the high level to the low level, thereby reducing the burnout probability of the third switching tube Q1, and playing a role of protecting the third switching tube Q1.
It will be appreciated that stopping the motor P2 immediately after the pencil is cut to the point where it leaks out may result in incomplete pencil cutting, only the point where it leaks out, and a small degree of cutting, requiring a re-cutting after a short period of use, which is very cumbersome. In order to solve the above problem, in an embodiment of the present application, the second sub-circuit 100 further includes a first capacitor C5, and the control terminal of the second switching tube Q2 is grounded between the third resistor R9 and the control terminal of the second switching tube Q2 through the first capacitor C5. Specifically, the gate of the second switching tube Q2 is grounded to the third resistor R9 through the first capacitor C5. When the pencil is cut to leak the nib, the pencil touches first touch switch P6, and first touch switch P6 breaks off at this moment, and battery P1 charges for the electric capacity through third resistance R9, and through first duration, electric capacity charges to the DELAY level and satisfies the turn-on voltage of second switch tube Q2 to make second switch tube Q2 switch on, thereby make motor P2 stop rotating, and in first duration, motor P2 keeps normal operating, can keep cutting the pencil in first duration, avoid pencil cutting degree less. It should be noted that, the first duration is related to the capacitance of the first capacitor C5 and the positive voltage of the battery P1, and those skilled in the art may set the capacitance of the first capacitor C5 and the positive voltage of the battery P1 according to actual needs, so as to set the first duration.
In an embodiment, the control circuit of the embodiment of the present application further includes a protection diode D2, an input end of the protection diode D2 is connected to a negative terminal of the motor P2, and an output end of the protection diode D2 is connected to a positive terminal of the motor P2.
It can be appreciated that the control circuit of the embodiment of the present application further includes a start switch P5, and the first sub-circuit and the power supply sub-circuit are connected through the start switch P5. Specifically, the start switch P5 is a normally open switch, the source of the first switching tube Q4 is connected to the positive electrode of the battery P1 through the start switch P5, and the gate of the second switching tube Q2 is also connected to the positive electrode of the battery P1 through the start switch P5 with the third resistor R9. The start switch P5 is disposed on the side of the pencil sharpening device, and when the pencil is put into the pencil sharpening device, the start switch P5 is pressed to be closed, so that the source electrode of the first switching tube Q4 can be conducted with the positive electrode of the battery P1, and the space between the gate electrode of the second switching tube Q2 and the third resistor R9 can also be conducted with the positive electrode of the battery P1. When the pencil is taken out from the pencil sharpening device, the start switch P5 is turned off.
It is understood that the control circuit of the embodiment of the present application further includes a temperature protection switch P3, and the first sub-circuit is connected to the start switch P5 through the temperature protection switch P3. Specifically, the source of the first switching tube Q4 is connected to the start switch P5 through the temperature protection switch P3, and the gate of the second switching tube Q2 is also connected to the start switch P5 through the temperature protection switch P3 between the gate and the third resistor R9. The temperature protection switch P3 is used for detecting the temperature of the motor P2, the temperature switch is a normally closed switch, when the temperature of the motor P2 is normal, the temperature switch is in a closed state, when the temperature of the motor P2 is higher than the temperature threshold value of the temperature switch, the temperature switch is disconnected, the damage caused by overhigh temperature of the motor P2 is avoided, and the effect of a protection circuit can be realized. It should be noted that, in the embodiment of the present application, the temperature threshold is not specifically limited, and those skilled in the art may set the temperature threshold according to actual needs.
It can be appreciated that the control circuit of the embodiment of the present application further includes a charging electronic circuit, and the charging electronic circuit includes a battery P1; the charging sub-circuit comprises a charging module U1, wherein the voltage input end of the charging module U1 is used for being connected with an external power supply, the output end of the charging module U1 is connected with the battery P1, and the battery P1 can be charged through the charging module U1.
It may be appreciated that, referring to fig. 2, the control circuit of the embodiment of the present application further includes an indication sub-circuit 200, where the indication sub-circuit 200 includes a second light emitting diode LED2, a first light emitting diode LED1, a fourth switching tube Q3, and a fourth resistor R4, the control end of the fourth switching tube Q3 is connected to the first sub-circuit through the fourth resistor R4, the first end of the fourth switching tube Q3 is grounded, the second end of the fourth switching tube Q3 is connected to the output end of the second light emitting diode LED2, the input end of the second light emitting diode LED2 is connected to the input end of the first light emitting diode LED1, the output end of the first light emitting diode LED1 is connected to the charging indication end of the charging module U1, the input end of the second light emitting diode LED2 is connected to the power supply circuit, and the output end of the second light emitting diode LED2 is also connected to the charging completion indication end of the charging module U1.
The light emitted by the second light emitting diode LED2 is blue, the light emitted by the first light emitting diode LED1 is red, the fourth switching tube Q3 is a triode, the control end of the fourth switching tube Q3 is a base electrode of the triode, the first end of the fourth switching tube Q3 is an emitter electrode, and the second end of the fourth switching tube Q3 is a collector electrode. The base of the fourth switching tube Q3 is connected with the drain electrode of the first switching tube Q4 through a fourth resistor R4, the emitter electrode of the fourth switching tube Q3 is grounded, the collector electrode of the fourth switching tube Q3 is connected with the output end of the second light-emitting diode LED2, the input end of the second light-emitting diode LED2 is connected with the input end of the first light-emitting diode LED1, the output end of the first light-emitting diode LED1 is connected with the charging indicating end of the charging module U1, the positive electrode end of the battery P1 is connected between the input end of the second light-emitting diode LED2 and the input end of the first light-emitting diode LED1, and the output end of the second light-emitting diode LED2 is also connected with the charging completion indicating end of the charging module U1. When the start switch P5 is closed and the pencil is not cut, the first touch switch P6 is closed, the motor P2 operates normally, the DELAY level is at a low level, the first switch tube Q4 is turned on, so the base of the fourth switch tube Q3 is at a high level, the fourth switch tube Q3 is turned on, the output end of the second light emitting diode LED2 is grounded, so the second light emitting diode LED2 is turned on, the second light emitting diode LED2 emits blue light, and the pencil sharpening device is instructed to shave the pencil at the moment. When cutting is completed, the first touch switch P6 is turned off, at this time, the DELAY level is high, the second switching tube Q2 is turned on, so that the third switching tube Q1 is turned off, the motor P2 stops running, and the first switching tube Q4 is turned off, so that the base electrode of the fourth switching tube Q3 is not level, and the fourth switching tube Q3 is turned off, so that the output end of the second light emitting diode LED2 is not level, the second light emitting diode LED2 cannot be turned on, and no pencil sharpening operation of the pencil sharpening device can be indicated at this time.
When charging, the charging completion indication end of the charging module U1 is at a high level, the charging indication end is at a low level, that is, CHGIN is at a low level and CHGST is at a high level at this time, so that the output end of the second light emitting diode LED2 is at a high level, the output end of the first light emitting diode LED1 is at a low level, the second light emitting diode LED2 cannot be turned on, the first light emitting diode LED1 is turned on, so that the second light emitting diode LED2 cannot emit light, and the first light emitting diode LED1 emits red light, which can indicate that charging is being performed at this time.
When the charging is completed, the charging completion indication end of the charging module U1 is at a low level, and the charging indication end is at a high level, that is, CHGIN is at a high level at this time, CHGST is at a low level, so that the output end of the second light emitting diode LED2 is at a low level, the output end of the first light emitting diode LED1 is at a high level, the second light emitting diode LED2 is turned on, the first light emitting diode LED1 cannot be turned on, so that the second light emitting diode emits blue light, and the first light emitting diode LED1 cannot emit light, so that the charging is completed at this time.
Through the above indicating sub-circuit 200 and the charging sub-circuit, the charging state and the operation state of the motor P2 can be indicated by using only 2 light emitting diodes, which is convenient for a user to observe the operation state of the cutting device and can save the cost.
In an embodiment, referring to fig. 2, a charging module U1 employs a TP4056 charging chip, a charging indicating end of the charging module U1 is a STAT1 pin, a charging completion indicating end of the charging module U1 is a STAT2 pin, an output end of the charging module U1 is a BAT pin, and a voltage input end of the charging module U1 is a VIN pin. The CE pin of the charging module U1 is connected with 5V voltage, the BAT pin of the charging module U1 is grounded through a capacitor C4, the pwd pin of the charging module U1 is grounded, the TEMP pin of the charging module U1 is grounded, the ISET pin of the charging module U1 is grounded through a resistor R1, the GND pin of the charging module U1 is grounded, the VIN pin of the charging module U1 is connected with 5V constant voltage through a resistor R2, and the VIN pin of the charging module U1 is grounded through a capacitor C3 between the VIN pin and the resistor R2. It should be noted that, although the charging sub-circuit adopts the charging chip, only the charging sub-circuit adopts the chip, and other circuits do not adopt the micro-controller, compared with the related art, the related art needs to adopt the micro-processor to process when controlling the motor P2 to stop running, and the circuit is complex, and the control circuit in the embodiment of the application can control the motor P2 to stop running when the pencil cutting is completed without adopting the micro-processor, so that the cost can be reduced.
In an embodiment, the output end of the second light emitting diode LED2 is connected to the STAT2 pin through a resistor R6, and the output end of the first light emitting diode LED1 is connected to the STAT1 pin through a resistor R3.
A pencil sharpener according to an embodiment of the second aspect of the present application includes the control circuit of the embodiment of the first aspect. Wherein, the start switch P5 is arranged at the inner side of the pencil sharpening device, and when the pencil is inserted into the pencil sharpening device, the start switch P5 is extruded, so that the start switch P5 is closed. The first touch switch P6 is arranged at the bottom of the pencil sharpening device, and when the pencil is sharpened to leak out of the pencil point, the pencil point can touch the first touch switch P6, so that the first touch switch P6 is disconnected.
The pencil sharpener according to the second aspect of the embodiment of the present application has at least the following advantages: all the advantageous effects of the control circuit including the embodiment of the first aspect are not described here in detail.
The embodiments of the present application have been described in detail above with reference to the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present application. Furthermore, embodiments of the present application and features of the embodiments may be combined with each other without conflict.

Claims (10)

1. A control circuit, characterized by being applied to a pencil sharpening device including a motor for sharpening pencil; the control circuit includes:
the power supply electronic circuit is connected with the motor;
the first touch switch is grounded, and the first touch switch is a normally closed switch;
the first sub-circuit is connected with the power supply sub-circuit, and the first sub-circuit is connected with the second end of the first touch switch;
the second sub-circuit is connected with the first sub-circuit and is also connected with the second end of the first touch switch;
the third sub-circuit is connected with the first sub-circuit and the second sub-circuit respectively, and is also connected with the motor;
the first touch switch is used for being opened when the pencil sharpening of the pencil sharpening device is completed, and the first touch switch is used for enabling the first sub-circuit to be on and enabling the second sub-circuit to be off when the first touch switch is closed; the first touch switch is also used for enabling the first sub-circuit to be cut off and enabling the second sub-circuit to be conducted when the first touch switch is disconnected;
the third sub-circuit is used for conducting between the power supply circuit and the motor when the first sub-circuit is conducted and the second sub-circuit is cut off, so that the power supply circuit supplies power to the motor; the third sub-circuit is further configured to turn off between the power supply circuit and the motor when the second sub-circuit is turned on.
2. The control circuit of claim 1, wherein the first sub-circuit comprises a first switching tube, a first end of the first switching tube is connected with the power supply circuit, a control end of the first switching tube is connected with a second end of the first touch switch, and a second end of the first switching tube is connected with the second sub-circuit; the first switch tube is used for being conducted when the first touch switch is closed, and being cut off when the first touch switch is opened.
3. The control circuit according to claim 2, wherein the second sub-circuit comprises a second switching tube, a first resistor, a second resistor and a third resistor, a first end of the second switching tube is connected with a second end of the first switching tube through the first resistor, the second end of the second switching tube is grounded through the second resistor, a second end of the second switching tube is grounded, a control end of the second switching tube is connected with the power supply circuit through the third resistor, and a second end of the first touch switch is connected between the control end of the second switching tube and the third resistor; the second switch tube is used for being turned off when the first touch switch is turned on when the first touch switch is turned off.
4. A control circuit according to claim 3, wherein the third sub-circuit comprises a third switching tube, a first end of the third switching tube is grounded, a second end of the third switching tube is connected with the motor, a control end of the third switching tube is connected with a first end of the second switching tube, the third switching tube is used for being conducted when the first switching tube is conducted and the second switching tube is turned off, and the third switching tube is used for being turned off when the second switching tube is conducted, and the third switching tube is used for enabling the electronic circuit to supply power to the motor when the third switching tube is conducted.
5. A control circuit as claimed in claim 3, wherein the second sub-circuit further comprises a first capacitor, the control terminal of the second switching tube being connected to the third resistor via the first capacitor.
6. The control circuit of claim 1, further comprising a start switch, the first sub-circuit being coupled to the electronic circuit via the start switch.
7. The control circuit of claim 6, further comprising a temperature protection switch, wherein the first sub-circuit is connected to the start switch through the temperature protection switch.
8. The control circuit of claim 1, further comprising a charging electronic circuit, the power supply electronic circuit comprising a battery;
the charging sub-circuit comprises a charging module, wherein the voltage input end of the charging module is used for being connected with an external power supply, and the output end of the charging module is connected with the battery.
9. The control circuit of claim 8, further comprising an indicator sub-circuit, wherein the indicator sub-circuit comprises a second light emitting diode, a first light emitting diode, a fourth switch tube and a fourth resistor, wherein a control end of the fourth switch tube is connected with the first sub-circuit through the fourth resistor, a first end of the fourth switch tube is grounded, a second end of the fourth switch tube is connected with an output end of the second light emitting diode, an input end of the second light emitting diode is connected with an input end of the first light emitting diode, an output end of the first light emitting diode is connected with an on-charging indicator end of the charging module, an input end of the second light emitting diode is connected with an input end of the first light emitting diode is connected with the power supply circuit, and an output end of the second light emitting diode is also connected with a charging completion indicator end of the charging module.
10. A pencil sharpener apparatus comprising a control circuit as claimed in any one of claims 1 to 9.
CN202310301471.5A 2023-03-23 2023-03-23 Control circuit and pencil sharpening device Pending CN116545302A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310301471.5A CN116545302A (en) 2023-03-23 2023-03-23 Control circuit and pencil sharpening device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310301471.5A CN116545302A (en) 2023-03-23 2023-03-23 Control circuit and pencil sharpening device

Publications (1)

Publication Number Publication Date
CN116545302A true CN116545302A (en) 2023-08-04

Family

ID=87449520

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310301471.5A Pending CN116545302A (en) 2023-03-23 2023-03-23 Control circuit and pencil sharpening device

Country Status (1)

Country Link
CN (1) CN116545302A (en)

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