Polishing machine control circuit and polishing machine

Abstract

The utility model discloses a polisher control circuit and a polisher, and relates to the technical field of polishers. The grinding machine control circuit comprises a driving circuit, a touch circuit board and a control circuit. When the touch circuit board is touched by a user in the touch area of the grinding machine shell, the capacitance value or the resistance value changes, and a corresponding touch signal is generated. The control circuit can recognize the operation of the user according to the touch signal, so that the driving circuit is controlled to drive the motor according to the operation of the user, and the rotating speed of the motor is adjusted. According to the utility model, no complex physical button or knob is needed, the stepless speed regulation of touch control can be realized, the regulation precision is higher, no hole is needed to be formed in the shell of the grinding machine, and the durability and the easy-to-clean property are enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of grinders, and particularly relates to a grinder control circuit and a grinder. Background Art

[0002] A grinder is a machine used for surface treatment and processing, and is widely used in fields such as manufacturing, construction, automotive repair, and home decoration. It can be used to remove unevenness, oxide layers, dirt, or old coatings on the material surface, making the material surface flat and smooth.

[0003] Existing grinders generally control the rotation speed of the grinder by means of a potentiometer or a rotary encoder, with low adjustment accuracy, and holes need to be opened on the grinder housing, resulting in poor durability and easy cleaning difficulties. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a grinder control circuit, aiming to solve the problems of low adjustment accuracy, poor durability, and easy cleaning difficulties of existing grinders.

[0005] To achieve the above purpose, the utility model proposes a grinder control circuit. The grinder includes a housing and a motor, and a touch area is provided on the housing. The grinder control circuit includes:

[0006] A drive circuit, which is electrically connected to the motor;

[0007] A touch circuit board, which is installed inside the touch area of the housing;

[0008] The touch circuit board is used to generate a corresponding touch signal when the touch area of the housing is touched by a user, and the capacitance value or the resistance value changes;

[0009] A control circuit, which is electrically connected to the touch circuit board and the drive circuit respectively;

[0010] The control circuit is used to control the drive circuit to drive the motor according to the touch signal.

[0011] In an embodiment, the touch circuit board is arranged in a ring shape, and the touch circuit board includes a first touch interface, a second touch interface, and a reference touch interface; the first touch interface, the second touch interface, and the reference touch interface are electrically connected to the control circuit respectively;

[0012] The touch circuit board is configured to, when the touch area of the housing is touched by a user, the capacitance value between the first touch interface and the reference touch interface changes, generating a corresponding first touch signal; the capacitance value between the second touch interface and the reference touch interface changes, generating a corresponding second touch signal; wherein, the touch signal includes the first touch signal and the second touch signal.

[0013] In one embodiment, the drive circuit includes a drive chip, a first resistor, a second resistor, a third resistor, a first capacitor and a second capacitor;

[0014] Wherein, the first pin of the drive chip is electrically connected to the first power supply terminal of the drive circuit; the second pin of the drive chip, one end of the first capacitor, and one end of the first resistor are electrically connected to the second power supply terminal of the drive circuit; the third pin of the drive chip, one end of the second capacitor are electrically connected to the first end of the motor; the fourth pin of the drive chip is electrically connected to the other end of the first resistor; the fifth pin of the drive chip is electrically connected to one end of the second resistor; the other end of the second resistor is electrically connected to the control circuit; the sixth pin of the drive chip is electrically connected to one end of the third resistor; the other end of the third resistor is electrically connected to the control circuit; the seventh pin of the drive chip, the other end of the second capacitor are connected to the second end of the motor; the ground pin of the drive chip and the other end of the first capacitor are grounded.

[0015] In one embodiment, the drive circuit further includes a third capacitor, a fourth resistor, a fifth resistor and a sixth resistor;

[0016] Wherein, one end of the fourth resistor, one end of the fifth resistor, and one end of the sixth resistor are electrically connected to the eighth pin of the drive chip; the other end of the fourth resistor, one end of the third capacitor are electrically connected to the control circuit; the other end of the third capacitor, the other end of the fifth resistor and the other end of the sixth resistor are grounded.

[0017] In one embodiment, the grinder control circuit further includes a display circuit, and the display circuit is electrically connected to the control circuit;

[0018] The control circuit is configured to control the display circuit to display the rotation speed of the motor.

[0019] In one embodiment, the grinder control circuit further includes a power supply circuit; the power supply circuit is electrically connected to an external power input terminal, the drive circuit and the control circuit respectively, and the power supply circuit is configured to perform voltage conversion on the external power supply voltage and then output it.

[0020] In one embodiment, the power supply circuit includes an input interface, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, and a voltage regulator chip;

[0021] Among them, the first end of the input interface, the negative electrode of the first diode, and the positive electrode of the second diode are electrically connected; the negative electrode of the second diode, the negative electrode of the third diode, the positive electrode of the fifth diode, and the first output terminal of the power supply circuit are electrically connected; the second end of the input interface, the negative electrode of the fourth diode, and the positive electrode of the third diode are electrically connected; the negative electrode of the fifth diode, one end of the fourth capacitor, and the VIN pin of the voltage regulator chip are electrically connected; the VOUT pin of the voltage regulator chip, one end of the fifth capacitor, and one end of the sixth capacitor are electrically connected to the second output terminal of the power supply circuit; the positive electrode of the first diode, the positive electrode of the second diode, the other end of the fourth capacitor, the GND pin of the voltage regulator chip, the other end of the fifth capacitor, and the other end of the sixth capacitor are grounded.

[0022] In one embodiment, the display circuit is a digital tube display circuit, and the digital tube display circuit includes a plurality of digital tubes.

[0023] In one embodiment, the grinder control circuit further includes a green light-emitting diode, a red light-emitting diode, a seventh resistor, and an eighth resistor;

[0024] Among them, one end of the seventh resistor is electrically connected to the control circuit; the other end of the seventh resistor is electrically connected to the positive electrode of the green light-emitting diode; one end of the eighth resistor is electrically connected to the control circuit; the other end of the eighth resistor is electrically connected to the positive electrode of the red light-emitting diode; the negative electrode of the green light-emitting diode and the negative electrode of the red light-emitting diode are grounded.

[0025] The present utility model also proposes a grinder, and the grinder includes the grinder control circuit as described above.

[0026] The technical solution of the present utility model adopts a grinding machine control circuit. The grinding machine includes a housing and a motor. A touch area is provided on the housing. The grinding machine control circuit includes a driving circuit, a touch circuit board and a control circuit. Among them, when the touch circuit board is touched by a user in the touch area of the housing, the capacitance value or the resistance value changes, generating a corresponding touch signal. The control circuit can identify the operation of the user according to the touch signal, and thus control the driving circuit to drive the motor according to the operation of the user to adjust the motor speed. In this way, the present utility model can identify the operation of the user through the touch circuit board installed inside the housing. Compared with the existing grinding machine, the present utility model does not require complex physical buttons or knobs, can achieve stepless speed regulation by touch control, has a higher adjustment accuracy, and does not need to open holes on the housing of the grinding machine, enhancing the durability and easy cleaning performance. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0028] Figure 1 It is a schematic structural diagram of an embodiment of the grinding machine control circuit provided by the present utility model;

[0029] Figure 2 It is an electronic circuit diagram of another embodiment of the grinding machine control circuit provided by the present utility model;

[0030] Figure 3 It is an electronic circuit diagram of the driving circuit of an embodiment of the grinding machine control circuit provided by the present utility model;

[0031] Figure 4 It is an electronic circuit diagram of the display circuit of another embodiment of the grinding machine control circuit provided by the present utility model;

[0032] Figure 5 It is an electronic circuit diagram of the power supply circuit of an embodiment of the grinding machine control circuit provided by the present utility model;

[0033] Figure 6 It is a schematic structural diagram of the touch circuit board of an embodiment of the grinding machine control circuit provided by the present utility model.

[0034] Explanation of the Reference Numerals in the Drawings:

[0035]

[0036] The realization, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0038] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0039] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0040] Existing grinders generally control the rotation speed of the grinder by means of a potentiometer or a rotary encoder, with relatively low adjustment accuracy, and holes need to be opened on the grinder housing, resulting in poor durability and easy cleaning difficulties.

[0041] The present utility model proposes a control circuit for a grinder.

[0042] Please refer to Figure 1 , in an embodiment of the present utility model, the grinder includes a housing and a motor MT. A touch area is provided on the housing. The control circuit of the grinder includes:

[0043] A drive circuit 01, which is electrically connected to the motor MT;

[0044] It should be noted that the drive circuit 01 may include a power transistor. The control circuit 03 can control the on / off of the power transistor by outputting PWM signals with different duty cycles, thereby adjusting the current or voltage output by the drive circuit 01, and thus adjusting the rotation speed of the motor MT.

[0045] Touch circuit board 02 is installed inside the touch area of the housing;

[0046] The touch circuit board 02 is configured such that when the touch area of the housing is touched by a user, the capacitance value or the resistance value changes, generating a corresponding touch signal;

[0047] It should be noted that multiple sensing circuits may be distributed on the touch circuit board 02. Among them, the sensing circuit may be composed of metal electrodes or other conductive materials. The metal electrodes can be arranged longitudinally or horizontally to form a capacitive network. When a finger approaches or touches the electrode, the capacitance of the human body will be coupled with the capacitance of the electrode, causing a change in the local capacitance. The sensing circuit can detect this capacitance change. If there is no touch event, the signal is relatively stable. When a touch event occurs, the phase and amplitude of the signal will change. The mutual capacitance technology can be adopted, that is, the touch event can be detected by detecting the capacitance change between electrode pairs, which can provide higher precision and stability.

[0048] It should be noted that the touch circuit board 02 can also be composed of two layers of resistive materials with isolation points provided between the two layers to keep them separated when not touched. When the user touches the housing, the upper and lower layers of resistive materials come into contact at the touch point. The touch causes current to pass through the contact point, changing the local resistance distribution, and thus the resistance value changes, and the output voltage also changes. In this way, it can also indicate that a touch event has occurred.

[0049] Control circuit 03, the control circuit 03 is electrically connected to the touch circuit board 02 and the drive circuit 01 respectively;

[0050] The control circuit 03 is used to control the drive circuit 01 to drive the motor MT according to the touch signal.

[0051] It should be noted that please refer to Figure 2 , the control circuit 03 may include a control chip U3, a seventh capacitor C7 and an eighth capacitor C8. Among them, the seventh capacitor C7 and the eighth capacitor C8 can filter the input power supply. The control chip U3 can be an MCU (Microcontroller Unit) chip, which has the advantages of low power consumption, easy development and integration.

[0052] In this embodiment, when the touch circuit board 02 is touched by a user in the touch area of the housing, the capacitance value or the resistance value changes, generating a corresponding touch signal. The control circuit 03 can identify the user's operation according to the touch signal, and thus control the driving circuit 01 to drive the motor MT according to the user's operation. In this way, this embodiment can identify the user's operation through the touch circuit board 02 installed inside the housing. Among them, this embodiment can achieve button-type control. Touch button marks for increasing and decreasing the speed are provided on the housing, and the user can directly touch the buttons to increase or decrease the speed. This embodiment can also achieve sliding control. The housing can be equipped with a speed sliding control area, and the user can slide their finger on this area to adjust the speed. For example, it is set that sliding the finger to the right will gradually increase the speed, and sliding to the left will gradually decrease the speed. In this way, compared with the existing grinding machine, this embodiment does not require complex physical buttons or knobs, can achieve stepless speed regulation by touch control, has a higher adjustment accuracy, and does not need to open holes on the grinding machine housing, enhancing the durability and easy cleaning performance.

[0053] In this utility model, when the touch circuit board 02 is touched by a user in the touch area of the housing, the capacitance value or the resistance value changes, generating a corresponding touch signal. The control circuit 03 can identify the user's operation according to the touch signal, and thus control the driving circuit 01 to drive the motor MT according to the user's operation. In this way, this utility model can identify the user's operation through the touch circuit board 02 installed inside the housing. In this way, compared with the existing grinding machine, this utility model does not require complex physical buttons or knobs, can achieve stepless speed regulation by touch control, has a higher adjustment accuracy, and does not need to open holes on the grinding machine housing, enhancing the durability and easy cleaning performance.

[0054] Please refer to Figure 2 With Figure 6 , in an embodiment of this utility model, the touch circuit board 02 is arranged in a ring shape. The touch circuit board 02 includes a first touch interface TK1, a second touch interface TK2, and a reference touch interface TK0; the first touch interface TK1, the second touch interface TK2, and the reference touch interface TK0 are respectively electrically connected to the control circuit 03;

[0055] The touch circuit board 02 is used for, when the touch area of the housing is touched by a user, the capacitance value between the first touch interface TK1 and the reference touch interface TK0 changes, generating a corresponding first touch signal; the capacitance value between the second touch interface TK2 and the reference touch interface TK0 changes, generating a corresponding second touch signal; wherein, the touch signal includes the first touch signal and the second touch signal.

[0056] In this embodiment, the touch circuit board 02 is designed to be circular and surrounds the touch area of the housing, facilitating the arrangement of multiple touch interfaces at different touch positions to capture different touch actions of the user.

[0057] In this embodiment, as the finger moves circularly, the first touch interface TK1 and the second touch interface TK2 can collect the change in capacitance value. The capacitance value collected by one touch interface changes from small to large, and the capacitance value collected by the other touch interface changes from large to small. Among them, the capacitance value collected by the reference touch interface TK0 can be used as a reference point, which can help the control circuit 03 determine the specific position and change trend of the finger on the circular touch area. In this way, this embodiment can achieve sliding control, can achieve stepless speed regulation, and has a high adjustment accuracy.

[0058] In this embodiment, the touch circuit board 02 may further include a third touch interface TK3 and a fourth touch interface TK4, and the third touch interface TK3 and the fourth touch interface TK4 are respectively connected to the control circuit 03. The third touch interface TK3 and the fourth touch interface TK4 can be used to achieve button control. Specifically, the third touch interface TK3 can achieve the control of power on / off by collecting the change in capacitance value, and the fourth touch interface TK4 can achieve the control of speed increase / decrease by collecting the change in capacitance value. In this way, this embodiment can also achieve button control. The button control and the sliding control adopt different touch interfaces, making the operation logic of the grinding machine clearer and more intuitive, and reducing the possibility of incorrect operation.

[0059] Please refer to Figure 3 , in an embodiment of the present invention, the drive circuit 01 includes a drive chip U1, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1 and a second capacitor C2;

[0060] Among them, the first pin of the drive chip U1 is electrically connected to the first power supply terminal of the drive circuit 01; the second pin of the drive chip U1, one end of the first capacitor C1, and one end of the first resistor R1 are electrically connected to the second power supply terminal of the drive circuit 01; the third pin of the drive chip U1, one end of the second capacitor C2 are electrically connected to the first end of the motor MT; the fourth pin of the drive chip U1 is electrically connected to the other end of the first resistor R1; the fifth pin of the drive chip U1 is electrically connected to one end of the second resistor R2; the other end of the second resistor R2 is electrically connected to the control circuit 03; the sixth pin of the drive chip U1 is electrically connected to one end of the third resistor R3; the other end of the third resistor R3 is electrically connected to the control circuit 03; the seventh pin of the drive chip U1, the other end of the second capacitor C2 are connected to the second end of the motor MT; the ground pin of the drive chip U1 and the other end of the first capacitor C1 are grounded.

[0061] In this embodiment, the control circuit 03 controls the driving chip U1 to drive the motor MT by outputting the first PWM signal and the second PWM signal. Among them, when it is necessary to control the forward rotation of the motor MT, it can be controlled by the first PWM signal, and when it is necessary to control the reverse rotation of the motor MT, it can be controlled by the second PWM signal. Specifically, the magnitude of the driving current output by the driving chip U1 can be controlled by changing the duty cycle of the output PWM signal, thereby adjusting the rotational speed of the motor MT.

[0062] Please refer to Figure 3 , in an embodiment of the present utility model, the driving circuit 01 further includes a third capacitor C3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6;

[0063] Among them, one end of the fourth resistor R4, one end of the fifth resistor R5, and one end of the sixth resistor R6 are electrically connected to the eighth pin of the driving chip U1; the other end of the fourth resistor R4 and one end of the third capacitor C3 are electrically connected to the control circuit 03; the other end of the third capacitor C3, the other end of the fifth resistor R5, and the other end of the sixth resistor R6 are grounded.

[0064] In this embodiment, the circuit formed by the third capacitor C3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 can detect whether the driving current of the motor MT is abnormal and output a detection signal to the control circuit 03. When the driving current of the motor MT is greater than the preset threshold, the control circuit 03 can output a low level to control the motor MT to stop rotating, and can also control the indicator light to flash to prompt that the grinding machine is in an overload or other abnormal state. In this way, overcurrent protection of the grinding machine can be achieved in this embodiment.

[0065] Please refer to Figure 4 , in an embodiment of the present utility model, the grinding machine control circuit further includes a display circuit, and the display circuit is electrically connected to the control circuit 03;

[0066] The control circuit 03 is used to control the display circuit to display the rotational speed of the motor MT.

[0067] In this embodiment, the user can be prompted of the current rotational speed of the motor MT. Among them, the control circuit 03 can determine the rotational speed of the motor based on the duty cycle of the output PWM signal, and the rotational speed can be displayed in the form of a percentage. The larger the duty cycle of the output PWM signal, the larger the percentage of the displayed motor rotational speed.

[0068] Please refer to Figure 5 , in an embodiment of the present utility model, the grinding machine control circuit further includes a power supply circuit; the power supply circuit is electrically connected to the external power input terminal, the driving circuit 01, and the control circuit 03 respectively, and the power supply circuit is used to perform voltage conversion on the external power supply voltage and then output it.

[0069] In this embodiment, the power supply circuit can convert the external power supply voltage and output it to the driving circuit 01 and the control circuit 03, which can ensure that the circuit can work stably within a suitable voltage range and prevent failures or damages caused by unstable or mismatched voltages.

[0070] Please refer to Figure 5 , in an embodiment of the present utility model, the power supply circuit includes an input interface, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5 and a voltage regulator chip U2;

[0071] Among them, the first end of the input interface, the negative electrode of the first diode D1 and the positive electrode of the second diode D2 are electrically connected; the negative electrode of the second diode D2, the negative electrode of the third diode D3, and the positive electrode of the fifth diode D5 are electrically connected to the first output terminal of the power supply circuit; the second end of the input interface, the negative electrode of the fourth diode D4 and the positive electrode of the third diode D3 are electrically connected; the negative electrode of the fifth diode D5, one end of the fourth capacitor C4 and the VIN pin of the voltage regulator chip U2 are electrically connected; the VOUT pin of the voltage regulator chip U2, one end of the fifth capacitor C5, and one end of the sixth capacitor C6 are electrically connected to the second output terminal of the power supply circuit; the positive electrode of the first diode D1, the positive electrode of the second diode D2, the other end of the fourth capacitor C4, the GND pin of the voltage regulator chip U2, the other end of the fifth capacitor C5 and the other end of the sixth capacitor C6 are grounded.

[0072] In this embodiment, the input interface can input the external power supply voltage. The circuit composed of the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 can rectify the external power supply voltage and output a first DC voltage at the first output terminal of the power supply circuit. The first DC voltage is then regulated by the voltage regulator chip U2 and a second DC voltage is output at the second output terminal of the power supply circuit. Among them, the voltage regulator chip U2 can be a 78L05 chip. The 78L05 chip is a fixed output voltage regulator chip U2 with a +5V output, which can provide a stable +5V output when the input voltage is in the range of 7V to 35V. Cooperating with the fourth capacitor C4, the fifth capacitor C5 and the sixth capacitor C6 can reduce the noise and fluctuations in the circuit.

[0073] Please refer to Figure 4 , in an embodiment of the present utility model, the display circuit is a digital tube display circuit, and the digital tube display circuit includes a plurality of digital tubes.

[0074] In this embodiment, the digital tube display circuit includes two digital tubes. Each digital tube is composed of seven light-emitting diodes (A to G) and is used to display numbers from 0 to 9 and other symbols. Among them, the COM1 port is connected to the tens digital tube, and the COM2 port is connected to the units digital tube to receive their respective flag signals and control the display state of the digital tubes. In this way, this embodiment can display the rotation speed of the motor MT.

[0075] Please refer to Figure 2 , in an embodiment of the present utility model, the grinder control circuit further includes a green light-emitting diode GL1, a red light-emitting diode RL1, a seventh resistor R7, and an eighth resistor R8;

[0076] Among them, one end of the seventh resistor R7 is electrically connected to the control circuit 03; the other end of the seventh resistor R7 is electrically connected to the positive electrode of the green light-emitting diode GL1; one end of the eighth resistor R8 is electrically connected to the control circuit 03; the other end of the eighth resistor R8 is electrically connected to the positive electrode of the red light-emitting diode RL1; the negative electrode of the green light-emitting diode GL1 and the negative electrode of the red light-emitting diode RL1 are grounded.

[0077] In this embodiment, when the grinder is turned on and working properly, the green light-emitting diode GL1 is controlled to emit light. When abnormal situations such as overcurrent detection abnormalities occur, the red light-emitting diode RL1 is controlled to emit light. In this way, this embodiment can prompt the user about the state of the grinder.

[0078] The present utility model also proposes a grinder. The grinder includes a grinder control circuit, and the specific structure of the grinder control circuit refers to the above embodiment. Since this grinder adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0079] The above description is only an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A grinder control circuit, the grinder comprising a housing and a motor, the housing being provided with a touch area, characterized in that: The grinding machine control circuit comprises: a drive circuit, the drive circuit being electrically connected to the motor; A touch circuit board, the touch circuit board being installed inside the touch area of ​​the housing; The touch circuit board is used to change the capacitance value or the resistance value when the touch area of ​​the housing is touched by the user, thereby generating a corresponding touch signal; A control circuit, wherein the control circuit is electrically connected to the touch circuit board and the drive circuit respectively; The control circuit is used to control the driving circuit to drive the motor according to the touch signal.

2. The grinding machine control circuit according to claim 1, characterized in that: The touch circuit board is configured in a ring shape, and the touch circuit board includes a first touch interface, a second touch interface, and a reference touch interface; the first touch interface, the second touch interface, and the reference touch interface are electrically connected to the control circuit respectively; The touch circuit board is used for, when the touch area of ​​the housing is touched by a user, causing the capacitance value between the first touch interface and the reference touch interface to change, thereby generating a corresponding first touch signal; The capacitance value between the second touch interface and the reference touch interface changes, and a corresponding second touch signal is generated; wherein the touch signal includes a first touch signal and a second touch signal.

3. The grinding machine control circuit according to claim 1, characterized in that: The driving circuit includes a driving chip, a first resistor, a second resistor, a third resistor, a first capacitor and a second capacitor; Among them, the first pin of the driving chip is electrically connected to the first power supply terminal of the driving circuit; the second pin of the driving chip, one end of the first capacitor, and one end of the first resistor are electrically connected to the second power supply terminal of the driving circuit; the third pin of the driving chip and one end of the second capacitor are electrically connected to the first end of the motor; the fourth pin of the driving chip is electrically connected to the other end of the first resistor; the fifth pin of the driving chip is electrically connected to one end of the second resistor; the other end of the second resistor is electrically connected to the control circuit; the sixth pin of the driving chip is electrically connected to one end of the third resistor; the other end of the third resistor is electrically connected to the control circuit; the seventh pin of the driving chip and the other end of the second capacitor are connected to the second end of the motor; the ground pin of the driving chip and the other end of the first capacitor are grounded.

4. The grinding machine control circuit according to claim 3, characterized in that: The driving circuit further includes a third capacitor, a fourth resistor, a fifth resistor and a sixth resistor; Among them, one end of the fourth resistor, one end of the fifth resistor, and one end of the sixth resistor are electrically connected to the eighth pin of the driving chip; the other end of the fourth resistor and one end of the third capacitor are electrically connected to the control circuit; the other end of the third capacitor, the other end of the fifth resistor, and the other end of the sixth resistor are grounded.

5. The grinding machine control circuit according to claim 1, characterized in that: Also includes a display circuit, the display circuit is electrically connected to the control circuit; The control circuit is used to control the display circuit to display the rotation speed of the motor.

6. The grinding machine control circuit according to claim 1, characterized in that: It also includes a power supply circuit; the power supply circuit is electrically connected to the external power input terminal, the drive circuit and the control circuit respectively, and the power supply circuit is used to convert the external power supply voltage and output it.

7. The grinding machine control circuit according to claim 6, characterized in that: The power supply circuit includes an input interface, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode and a voltage stabilizing chip; Among them, the first end of the input interface, the cathode of the first diode and the anode of the second diode are electrically connected; the cathode of the second diode, the cathode of the third diode, and the anode of the fifth diode are electrically connected to the first output end of the power supply circuit; the second end of the input interface, the cathode of the fourth diode and the anode of the third diode are electrically connected; the cathode of the fifth diode and one end of the fourth capacitor are electrically connected to the VIN pin of the voltage stabilizing chip; the VOUT pin of the voltage stabilizing chip, one end of the fifth capacitor, and one end of the sixth capacitor are electrically connected to the second output end of the power supply circuit; the anode of the first diode, the cathode of the second diode, the other end of the fourth capacitor, the GND pin of the voltage stabilizing chip, the other end of the fifth capacitor and the other end of the sixth capacitor are grounded.

8. The grinding machine control circuit according to claim 5, characterized in that: The display circuit is a digital tube display circuit, and the digital tube display circuit includes a plurality of digital tubes.

9. The grinding machine control circuit according to claim 3, characterized in that: Also includes a green light emitting diode, a red light emitting diode, a seventh resistor and an eighth resistor; Among them, one end of the seventh resistor is electrically connected to the control circuit; the other end of the seventh resistor is electrically connected to the positive electrode of the green light-emitting diode; one end of the eighth resistor is electrically connected to the control circuit; the other end of the eighth resistor is electrically connected to the positive electrode of the red light-emitting diode; the cathode of the green light-emitting diode and the cathode of the red light-emitting diode are grounded.

10. A grinding machine, characterized in that: The invention comprises a grinding machine control circuit as claimed in any one of claims 1 to 9.

Images