CN218240301U - Garden tool control circuit and garden tool - Google Patents
Garden tool control circuit and garden tool Download PDFInfo
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- CN218240301U CN218240301U CN202221818457.XU CN202221818457U CN218240301U CN 218240301 U CN218240301 U CN 218240301U CN 202221818457 U CN202221818457 U CN 202221818457U CN 218240301 U CN218240301 U CN 218240301U
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Abstract
The application relates to garden instrument control field to a garden instrument control circuit and garden instrument are disclosed, this circuit includes: the device comprises a working power supply, a power supply module, a power supply switch, a switch selector, a key module, a control chip, a rotating speed sensor, a working motor, a detection circuit and a control circuit; the positive pole of working power supply in proper order with control chip with the anodal of work motor is connected, the positive pole of working power supply with still connect gradually between the control chip switch with the switch selector, control chip still with the button module the negative pole of work motor the negative pole of working power supply speed sensor with detection circuitry connects, control circuit respectively with the switch selector with detection circuitry connects, power module with control circuit with detection circuitry connects. This application has reduced garden instrument control circuit use cost.
Description
Technical Field
The utility model relates to a garden instrument control field especially relates to a garden instrument control circuit and garden instrument.
Background
Along with the high-speed development of micro-control chip and motor technology, micro-control chip and motor also use more and more on various garden instrument, also pay more and more attention to the control of micro-control chip on garden instrument and the protection of motor simultaneously, traditional garden instrument's control mode is through carrying out step-down processing to the power of inputing in order to realize the control of motor rotational speed to realize the control of circuit excessive pressure through the fuse. The control mode of the garden tool has great defects, and the problems that the voltage reduction module needs to be added to achieve the purpose of reducing the voltage and the overvoltage protection mode of the fuse cannot be recovered automatically exist. Namely, the control mode of the garden tool can cause the use cost of the control circuit of the garden tool to be increased due to the nature that the voltage reduction module and the fuse cannot be recovered by self.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a garden instrument control circuit and garden instrument aims at solving the technical problem who how to reduce garden instrument control circuit use cost.
In order to achieve the purpose, the utility model provides a garden tool control circuit, which comprises a working power supply, a power supply module, a power switch, a switch selector, a key module, a control chip, a rotating speed sensor, a working motor, a detection circuit and a control circuit;
the positive pole of working power supply in proper order with control chip with the anodal of work motor is connected, the positive pole of working power supply with still connect gradually between the control chip switch with the switch selector, control chip still with the button module the negative pole of work motor the negative pole of working power supply speed sensor control circuit with detection circuitry connects, control circuit respectively with the switch selector with detection circuitry connects, power module with control circuit with detection circuitry connects.
Optionally, the control chip includes a first input end, a first control input end, a first output end, a second input end and a second output end, the first input end is connected with the switch selector, the first control input end is connected with the key module, the first output end is connected with the negative pole of the working motor and the negative pole of the working power supply, the second input end is connected with the rotation speed sensor, and the second output end is connected with the control circuit.
Optionally, the control chip is a motor drive MCU.
Optionally, the switch selector includes a first terminal, a second terminal, a third terminal, and a control terminal, the control terminal is connected to the control circuit, the first terminal is connected to the power switch, the second terminal is connected to a system power ground, and the third terminal is connected to the control chip.
Optionally, the first terminal is connected to the second terminal and disconnected from the third terminal.
Optionally, the first terminal is connected to the third terminal and disconnected from the second terminal.
Optionally, the control circuit includes a first resistor, a first NPN triode, a second resistor, and a third resistor, one end of the first resistor is connected to the power module, the other end of the first resistor is connected to a collector of the first NPN triode and a control terminal of the switch selector, an emitter of the first NPN triode is connected to a system power ground, a base of the first NPN triode is connected to one end of the second resistor and one end of the third resistor, the other end of the second resistor is connected to the system power ground, and the other end of the third resistor is connected to the output end of the detection circuit as the input end of the control circuit.
Optionally, the detection circuit includes a fourth resistor, a fifth resistor, a sixth resistor, a second NPN transistor, a third NPN transistor, and a sampling resistor, one end of the sampling resistor is connected to the emitter of the third NPN transistor and the control chip, one end of the sampling resistor is connected to one end of the fourth resistor and the system power ground, the other end of the fourth resistor is connected to the emitter of the second NPN transistor, a collector of the second NPN transistor is suspended, a base of the second NPN transistor is connected to one end of the fifth resistor and the base of the third NPN transistor, the other end of the fifth resistor is connected to the power module, a collector of the third NPN transistor is connected to one end of the sixth resistor and the input end of the control circuit, and the other end of the sixth resistor is connected to the power module.
Optionally, the power module includes a first power source and a second power source, the first power source is connected to the control circuit, and the detection circuit is connected to the first power source and the second power source.
In addition, this application still provides a garden instrument, garden instrument includes foretell garden instrument control circuit.
The application provides a garden tool control circuit, which comprises a working power supply, a power supply module, a power supply switch, a switch selector, a key module, a control chip, a rotating speed sensor, a working motor, a detection circuit and a control circuit; the positive pole of working power supply in proper order with control chip with the anodal of work motor is connected, the positive pole of working power supply with still connect gradually between the control chip switch with the switch selector, control chip still with the button module the negative pole of work motor the negative pole of working power supply speed sensor with detection circuitry connects, control circuit respectively with the switch selector with detection circuitry connects, power module with control circuit with detection circuitry connects. Detect the circuit through detection circuitry, will switch on with control switch selector selectivity with different signal transmission to control circuit when the circuit overflows or the circuit is normal to fusing fuse when having avoided circuit among the prior art to the phenomenon that the circuit just can normally work after needing to be changed the fuse takes place, replaces non-reuse's fuse and then has reduced garden instrument control circuit use cost through control circuit.
Drawings
FIG. 1 is a schematic structural diagram of a garden tool control circuit according to the present invention;
FIG. 2 is a schematic view of the interior of a control chip in the garden tool control circuit according to the present invention;
FIG. 3 is a schematic diagram of the switch selector in the garden tool control circuit according to the present invention;
FIG. 4 is a circuit diagram of a control circuit of the garden tool control circuit of the present invention;
FIG. 5 is a circuit diagram of a detection circuit in the garden tool control circuit according to the present invention;
fig. 6 is the utility model discloses the inside schematic diagram of power module among the garden instrument control circuit.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the present embodiment are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In this application, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In addition, descriptions in this application as to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
The utility model provides a garden tool control circuit, refer to the structural schematic diagram of the garden tool control circuit of fig. 1, the garden tool control circuit includes a working power supply 10, a power module 00, a power switch 20, a switch selector 30, a key module 60, a control chip 50, a rotation speed sensor 70, a working motor 40, a detection circuit 80 and a control circuit 90;
the positive pole of working power supply 10 in proper order with control chip 50 with the anodal of work motor 40 is connected, the positive pole of working power supply 10 with still connect gradually between the control chip 50 switch 20 with switch selector 30, control chip 50 still with key module 60 the negative pole of work motor 40 the negative pole of working power supply 10 tachometric sensor 70 control circuit 90 with detection circuitry 80 connects, control circuit 90 respectively with switch selector 30 with detection circuitry 80 connects, power module 00 with control circuit 90 with detection circuitry 80 connects.
In the present embodiment, the detection circuit 80 is connected to the negative pole of the working motor 40 to detect whether the current of the negative pole exceeds a preset value. When the current exceeds the preset value, the overcurrent control information is sent to the control circuit 90, and the control circuit 90 selectively conducts the switch selector 30 according to the actually received overcurrent control information; when the predetermined value is not exceeded, the normal control information is sent to the control circuit 90, and the control circuit 90 selectively turns on the switch selector 30 according to the actually received normal control information. The detection circuit realizes the over-current control of the garden tool control circuit, and can reduce the use of fuses and further reduce the cost expenditure of the whole circuit. The garden tool control circuit controls the output voltage of the control chip 50 through the key module 60, and further realizes different rotating speeds by controlling the voltage at two ends of the working motor 40. It is also a point that the garden tool control circuit detects the actual rotation speed of the garden tool through the rotation speed sensor 70, compares the actual rotation speed with the theoretical rotation speed of the output voltage of the control chip 50, and sends the comparison result as control information to the control circuit 90 for control. The control circuit 90 controls the switch selector 30, so that the circuit and the components can be automatically disconnected when the current and the rotating speed of the whole circuit do not meet the requirements; when the current and the rotating speed of the whole circuit meet the requirements, the circuit can be automatically conducted, and further the cost for replacing devices is reduced.
Specifically, referring to fig. 2, fig. 2 is an internal schematic diagram of a control chip in a garden tool control circuit, the control chip 50 includes a first input end 51, a first control input end 52, a first output end FZ, a second input end 54 and a second output end KR, the first input end 51 is connected to the switch selector 30, the first control input end 52 is connected to the key module 60, the first output end FZ is connected to the negative pole of the working motor 40 and the negative pole of the working power supply 10, the second input end 54 is connected to the rotation speed sensor 70, and the second output end KR is connected to the control circuit 90.
Specifically, the control chip is a motor drive MCU.
In this embodiment, the control chip 50 is a motor driving MCU, which can realize the control of the motor and different control functions. The first input end 51, the first control input end 52 and the first output end FZ of the control chip 50 realize control of the rotation speed of the motor, and when the first input end 51 receives the voltage of the working power supply 10, the output voltage of the first output end FZ is controlled according to the key module 60 connected to the first control input end 52. Since the positive electrode of the working motor 40 is connected to the positive electrode of the working power supply 10, and the first output terminal FZ of the control chip 50 is connected to the negative electrode of the working motor 40, when the output voltage of the first output terminal FZ is controlled by the key module 60, the working motor 40 generates different voltages, and finally, different rotation speeds of the motors are achieved. And the first output end FZ is also connected with the detection circuit 80, so that the circuit current of the detection circuit can be detected in real time to protect the circuit. On the other hand, when the garden tool has a fault, such as a screw falling off or a circuit breaking, the rotation speed can be obtained in real time through the connection between the second input end 54 and the rotation speed sensor 70, and compared with the theoretical rotation speed of the output voltage corresponding to the first output end FZ, if the theoretical rotation speed exceeds an acceptable range, the control information is sent to the control circuit 90 to control the switch selector 30, so as to protect the use safety of the user.
Specifically, referring to fig. 3, fig. 3 is a schematic diagram of the inside of a switch selector in a garden tool control circuit, the switch selector 30 includes a first terminal 31, a second terminal 32, a third terminal 33 and a control terminal KX, the control terminal KX is connected to the control circuit 90, the first terminal 31 is connected to the power switch 20, the second terminal 32 is connected to a system power ground, and the third terminal 53 is connected to the control chip 50.
The first terminal 31 is connected to the second terminal 32 and disconnected from the third terminal 33.
The first terminal 31 is connected to the third terminal 33 and disconnected from the second terminal 32.
In this embodiment, the switch selector 30 is a dual selection switch, and can selectively turn on different switches according to different control information of the control terminal KX. Wherein the first terminal 31 is a common terminal, the second terminal 32 and the third terminal 33 are selective terminals, and the first terminal 31 and the second terminal 32 or the third terminal 33 can be conducted according to the requirement of the control terminal KX. In the present application, when the control terminal KX receives a high level, it actually indicates that the circuit is normal, the control terminal KX controls the first terminal 31 to be connected with the third terminal 33 and disconnected with the second terminal 32, and the third terminal 33 is connected with the control chip 50 to realize normal operation of the whole circuit; when the control terminal KX receives a low level, it actually means that the circuit is abnormal, and the control terminal KX controls the first terminal 31 to be connected with the second terminal 32 and disconnected with the third terminal 33, and the second terminal 32 is connected with the system power ground to realize the disconnection self-protection of the whole circuit. Wherein the control terminal KX receiving a low level may be caused by the detection circuit 80 detecting an overcurrent or the control chip 50 detecting an unsatisfactory rotation speed through the rotation speed sensor 70. The switch selector 30 can control the overcurrent and abnormal rotating speed of the circuit, protect the circuit and a user in time, and automatically recover the connection after the current recovers to be normal and the rotating speed is normal.
Further, in another embodiment of the garden tool control circuit according to the present application, referring to fig. 4, fig. 4 is a circuit diagram of a control circuit in the garden tool control circuit, and the control circuit 90 includes a first resistor R1, a first NPN transistor T1, a second resistor R2, and a third resistor R3, where one end of the first resistor R1 is connected to the first power supply 01 of the power module, one end of the first resistor R1 far away from the power module 00 is connected to the collector of the first NPN transistor T1 and the control terminal KX of the switch selector, the emitter of the first NPN transistor T1 is connected to the system power ground, one end of the first NPN transistor T1 connected to the base of the second resistor R2 and one end of the third resistor R3, one end of the second resistor R2 far away from the base of the first NPN transistor T1 is connected to the system power ground, and one end of the third resistor R3 far away from the base of the first NPN transistor T1 is connected to the detection circuit as an input terminal JC of the control circuit.
In the present embodiment, the control circuit 90 controls the switch selector 30 by receiving the control information from the detection circuit 80, as can be seen from fig. 4, when the input level information of the input end JC of the control circuit is a low level, the first NPN transistor T1 in the control circuit 90 is not turned on, so that the control terminal KX of the switch selector is directly connected to the first power supply 01 of the power supply module through the first resistor R1, and the control terminal KX of the switch selector is a high level; when the input level information of the input end JC of the control circuit is high level, the first NPN transistor T1 in the control circuit 90 is turned on, so that the control terminal KX of the switch selector is directly connected to the system power ground through the first NPN transistor T1, and thus the control terminal KX of the switch selector is low level, and further the selective conduction of the switch selector 30 can be controlled through the level.
Further, in another embodiment of the garden tool control circuit according to the present application, referring to fig. 5, fig. 5 is a circuit diagram of a detection circuit in the garden tool control circuit, the detection circuit 80 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second NPN transistor T2, a third NPN transistor T3, and a sampling resistor RL3, one end of the sampling resistor RL3 is connected to an emitter of the third NPN transistor T3 and the first output end FZ of the control chip, one end of the sampling resistor RL3 far from the emitter of the third NPN transistor T3 is connected to one end of the fourth resistor R4 and a system power ground, one end of the fourth resistor R4 far from the sampling resistor RL3 is connected to an emitter of the second NPN transistor T2, a collector of the second NPN transistor T2 is connected to one end of the fifth resistor R5 and a base of the third transistor T3, one end of the fifth resistor R5 far from the base of the third NPN transistor T3 is connected to one end of the collector of the second NPN transistor R3, and one end of the collector of the second resistor R3 is connected to one end of the collector of the NPN transistor T3, and one end of the collector of the third transistor T3 is connected to the collector of the third transistor JC, and one end of the collector of the third transistor T3 is connected to the collector of the third transistor T3, and the collector of the NPN transistor module is connected to the collector of the third transistor T3, and the collector of the NPN module.
In this embodiment, the detection circuit operates as follows: when the first power source VCC is 5V, the second power source VDD is 51V, the resistance of the first voltage dividing resistor (fifth resistor) R5 is 50K, the resistance of the second voltage dividing resistor (fourth resistor) R4 is 1K, and the resistance of the sampling resistor RL3 is 0.005 ohm (small resistor), the voltage across the second voltage dividing resistor R4 is (VDD-Ube)/(R5 + R7) = R7), and if Ube is 0.7V under normal conditions, the voltage across the second voltage dividing resistor R4 is 50.3/51 tube 1=0.986V, since the second NPN transistor T2 and the third NPN transistor T3 are the same, when the temperature changes, the BE junction voltage drop Ube of the second NPN transistor T2 and the third NPN transistor T3 changes in the same manner, and therefore, when the sampling voltage is greater than the voltage across the transistor provided by the second voltage dividing resistor R4, the voltage difference between the BE junctions of the third NPN transistor T3 is smaller than the voltage drop Ube of the third NPN transistor T3, so that the maximum NPN transistor load circuit can BE turned on and the load of the NPN transistor T3 is equivalent to 0.005/0.0. When the BE junction voltage drop Ube is reduced to 0.4V when the temperature rises, the voltage across the second voltage dividing resistor R4 is 50.6/51 × 1=0.992v, and as described above, the maximum current that the load circuit can bear at this time is 0.992/0.005=198.4A, and the amount of current change affected by the temperature is only 198.4A-197.2=1.2a,1.2/197.2 × 100% =0.6%, so that the offset compensation caused by the temperature change can BE realized. Therefore, the circuit adopts the same second NPN triode T2 and the same third NPN triode T3 to reduce the influence of temperature. Therefore, when the circuit current is larger than the maximum current which can BE borne by the load circuit, the voltage difference between the BE junctions of the third NPN triode T3 is smaller than the BE junction voltage drop Ube required by the conduction of the triodes, and the third NPN triode T3 is not conducted, so that the input end JC of the control circuit is directly connected to the first power VCC through the sixth resistor R6, and the input end JC of the control circuit is at a high level; when the circuit current is larger than or equal to the maximum current which can BE borne by the load circuit, the voltage difference between the BE junctions of the third NPN triode T3 is larger than or equal to the BE junction voltage drop Ube required by the conduction of the triodes, the third NPN triode T3 is conducted, therefore, the input end JC of the control circuit is directly connected to the system power ground through the third NPN triode T3, and the input end JC of the control circuit is at a low level. The high-low level of the input end JC of the control circuit is sent to the control circuit 90, and the control circuit 90 controls the switch selection 30 to be turned on through the high-low level of the input end JC of the control circuit.
Specifically, referring to fig. 6, fig. 6 is a schematic diagram of the inside of a power module in a garden tool control circuit, where the power module 00 includes a first power supply 01 and a second power supply 02, the first power supply 01 is connected to the control circuit 90, and the detection circuit 80 is connected to the first power supply 01 and the second power supply 02.
In this embodiment, the power module 00 provides different voltages for the detection circuit 80 and the control circuit 90 to ensure that the detection circuit 80 and the control circuit 90 work normally, so as to realize the detection and control functions in the garden tool control circuit.
In addition, this application still provides a garden instrument, garden instrument includes garden instrument control circuit.
The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications and equivalents of the technical solutions that can be directly or indirectly applied to other related fields without departing from the spirit of the present application are intended to be included in the scope of the present application.
Claims (10)
1. A garden tool control circuit is characterized by comprising a working power supply, a power supply module, a power supply switch, a switch selector, a key module, a control chip, a rotating speed sensor, a working motor, a detection circuit and a control circuit;
the positive pole of the working power supply is sequentially connected with the control chip and the positive pole of the working motor, the power switch and the switch selector are further sequentially connected between the positive pole of the working power supply and the control chip, the control chip is further connected with the key module, the negative electrode of the working motor, the negative electrode of the working power supply, the rotating speed sensor, the control circuit and the detection circuit, the control circuit is respectively connected with the switch selector and the detection circuit, and the power module is connected with the control circuit and the detection circuit.
2. The garden tool control circuit of claim 1, wherein the control chip comprises a first input terminal, a first control input terminal, a first output terminal, a second input terminal, and a second output terminal, the first input terminal is connected to the switch selector, the first control input terminal is connected to the key module, the first output terminal is connected to a negative electrode of the working motor and a negative electrode of the working power supply, the second input terminal is connected to the rotation speed sensor, and the second output terminal is connected to the control circuit.
3. The garden tool control circuit of claim 2, wherein the control chip is a motor drive MCU.
4. The garden tool control circuit of claim 2, wherein the switch selector comprises a first terminal, a second terminal, a third terminal, and a control terminal, the control terminal being connected to the control circuit, the first terminal being connected to the power switch, the second terminal being connected to a system power ground, and the third terminal being connected to the control chip.
5. The garden tool control circuit of claim 4, wherein the first terminal is connected to the second terminal and disconnected from the third terminal.
6. The garden tool control circuit of claim 4, wherein the first terminal is connected to the third terminal and disconnected from the second terminal.
7. The garden tool control circuit of claim 4, wherein the control circuit comprises a first resistor, a first NPN transistor, a second resistor, and a third resistor, one end of the first resistor is connected to a first power supply of a power module, the other end of the first resistor is connected to a collector of the first NPN transistor and a control terminal of the switch selector, an emitter of the first NPN transistor is connected to a system power ground, a base of the first NPN transistor is connected to one end of the second resistor and one end of the third resistor, the other end of the second resistor is connected to the system power ground, and the other end of the third resistor is connected to the detection circuit as an input of the control circuit.
8. The garden tool control circuit according to claim 7, wherein the detection circuit includes a fourth resistor, a fifth resistor, a sixth resistor, a second NPN transistor, a third NPN transistor, and a sampling resistor, one end of the sampling resistor is connected to an emitter of the third NPN transistor and a first output terminal of the control chip, one end of the sampling resistor is connected to one end of the fourth resistor and a system power ground, the other end of the fourth resistor is connected to an emitter of the second NPN transistor, a collector of the second NPN transistor is floating, a base of the second NPN transistor is connected to one end of the fifth resistor and a base of the third NPN transistor, the other end of the fifth resistor is connected to the power module second power source, a collector of the third NPN transistor is connected to one end of the sixth resistor and an input terminal of the control circuit, and the other end of the sixth resistor is connected to the first power source of the power module.
9. The garden tool control circuit of claim 1, wherein the power module comprises a first power source and a second power source, the first power source being coupled to the control circuit, the detection circuit being coupled to the first power source and the second power source.
10. A garden tool, characterized in that it comprises a garden tool control circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221818457.XU CN218240301U (en) | 2022-07-14 | 2022-07-14 | Garden tool control circuit and garden tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221818457.XU CN218240301U (en) | 2022-07-14 | 2022-07-14 | Garden tool control circuit and garden tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218240301U true CN218240301U (en) | 2023-01-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221818457.XU Active CN218240301U (en) | 2022-07-14 | 2022-07-14 | Garden tool control circuit and garden tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218240301U (en) |
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2022
- 2022-07-14 CN CN202221818457.XU patent/CN218240301U/en active Active
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