Polishing machine control circuit and polishing machine

Abstract

The utility model provides a grinding machine control circuit and a grinding machine, and relates to the technical field of grinding equipment. The grinding machine control circuit comprises a nixie tube display module, a control module, a power switch circuit module, a charging circuit module and a motor module. The display control end of the control module is connected with the nixie tube display module. The power switch circuit module comprises a key control sub-module and a power supply sub-module, a key switch output end of the key control sub-module is connected with the control module, a voltage input end of the power supply sub-module is used for being connected with a battery, and an anode of the battery is connected with a voltage detection end of the control module; the charging circuit module is connected with the voltage input end and the charging detection end of the control module; the motor module is connected with a motor control end of the control module; the voltage output end of the power supply sub-module is connected with the control module, the nixie tube display module and the motor module. The polisher with the polisher control circuit is higher in use convenience.

Description

Technical Field

[0001] The embodiments of the present application relate to, but are not limited to, the technical field of grinding equipment, and particularly relate to a control circuit and a grinding machine for a grinding machine. Background Art

[0002] A grinding machine can perform grinding by driving a motor. In practical applications, to improve the usability of the grinding machine, it is powered by a battery and a charging interface is provided to charge the battery. At the same time, for further usability, a display screen is provided to display the battery power. However, in the related art, after the battery power of the grinding machine is exhausted and the grinding machine is charging in the shutdown state, it can only identify whether it is charging and charging completion, and cannot identify the specific power, resulting in insufficient usability. Therefore, how to further improve the usability of the grinding machine is a technical problem to be solved urgently. Summary of the Utility Model

[0003] The following is an overview of the subject matter described in detail in this article. This overview is not intended to limit the scope of protection of the claims. The embodiments of the present application provide a control circuit and a grinding machine for a grinding machine, which can improve the usability of the grinding machine.

[0004] In a first aspect, a control circuit for a grinding machine according to an embodiment of the present application includes:

[0005] A digital tube display module;

[0006] A control module, the display control end of the control module is connected to the digital tube display module;

[0007] A power switch circuit module, the power switch circuit module includes a key control sub-module and a power sub-module, the key control sub-module is connected to the key switch output end of the control module, the voltage input end of the power sub-module is used to connect to a battery and the positive pole of the battery is connected to the voltage detection end of the control module;

[0008] A charging circuit module, the charging circuit module is connected to the voltage input end of the power sub-module and the charging detection end of the control module;

[0009] A motor module, the motor module is connected to the motor control end of the control module; the voltage output end of the power sub-module is connected to the control module, the digital tube display module and the motor module.

[0010] Therefore, the above embodiments of the present application have at least the following beneficial effects: The digital tube display circuit is connected to the control module, the charging detection terminal of the control module is connected to the charging circuit module, the voltage detection terminal of the control module is connected to the positive electrode of the battery, and the key control sub-module is independently set from the voltage detection. Thus, when the charging circuit module charges the battery, after the control module is started, it can jointly determine whether it is charging and the specific battery power through the voltage detection terminal and the charging detection terminal, and the control module can maintain the shutdown state when the key switch is closed through the key switch output terminal. Furthermore, the charging power can still be displayed in the shutdown state. Therefore, compared with the related art, the grinding machine corresponding to the control circuit of the present application embodiment has higher use convenience.

[0011] According to some embodiments of the first aspect of the present application, the key control sub-module includes a rotary switch, a first diode, and a first triode. The rotation speed pin of the rotary switch is connected to the control module, and the first switch pin of the rotary switch is connected to the cathode of the first diode; the second switch pin of the rotary switch is grounded; the anode of the first diode is electrically connected to the voltage input terminal of the power supply sub-module and the collector of the first triode. The emitter of the first triode is grounded, and the base of the first triode is connected to the key switch output terminal of the control module.

[0012] According to some embodiments of the first aspect of the present application, the power supply sub-module includes an NMOS transistor and an enhancement-mode field-effect transistor. The gate of the NMOS transistor is connected to the positive electrode of the battery, the source of the NMOS transistor is connected to the positive electrode of the battery, and the drain of the NMOS transistor is connected to the voltage input terminal of the enhancement-mode field-effect transistor and the voltage input terminal of the motor module. The voltage output terminal of the enhancement-mode field-effect transistor is connected to the power supply terminals of the control module and the digital tube display module.

[0013] According to some embodiments of the first aspect of the present application, the key control sub-module further includes a plurality of gear switches and a first resistor. The first ends of the plurality of gear switches are all grounded, the second ends of the plurality of gear switches are connected to the first end of the first resistor, and the second ends of the plurality of first resistors are connected to each other and connected to the signal detection pin of the control module; the resistance values of the respective first resistors are different.

[0014] According to some embodiments of the first aspect of the present application, the key control sub-module further includes a rotation speed and direction control switch and a second resistor. The first end of the rotation speed and direction control switch is grounded, the second end of the rotation speed and direction control switch is connected to the first end of the second resistor, and the second end of the second resistor is connected to the second end of the first resistor and connected to the signal detection pin of the control module. The resistance values of the first resistor and the second resistor are different.

[0015] According to some embodiments of the first aspect of the present application, the motor module includes a motor power supply circuit and a motor drive circuit. The motor power supply circuit is connected to the voltage input terminal of the motor drive circuit, and the motor power supply circuit is connected to the voltage control terminal of the control module. The motor power supply circuit is configured to adjust the voltage input to the voltage input terminal of the motor drive circuit according to a control signal output from the voltage control terminal of the control module.

[0016] According to some embodiments of the first aspect of the present application, the motor power supply circuit includes a buck-boost control chip, a first dual-gate field effect transistor, and a second dual-gate field effect transistor. Two gates of the first dual-gate field effect transistor are respectively connected to the first gate drive pin of the buck-boost control chip. The first drain of the first dual-gate field effect transistor is connected to the drain of the NMOS transistor. The first source corresponding to the first drain of the first dual-gate field effect transistor is connected to the first switching node pin of the buck-boost control chip, the first drain of the second dual-gate field effect transistor, and the second drain of the first dual-gate field effect transistor. The first drain of the second dual-gate field effect transistor is connected to the second switching node pin of the buck-boost control chip. The second drain of the second dual-gate field effect transistor is connected to the voltage input terminal of the motor drive circuit. The first source corresponding to the first drain of the second dual-gate field effect transistor is grounded. The second source corresponding to the second drain of the second dual-gate field effect transistor is connected to the second switching node pin. Two gates of the second dual-gate field effect transistor are respectively connected to the second gate drive pin of the buck-boost control chip. The voltage input terminal of the buck-boost control chip is connected to the drain of the NMOS transistor.

[0017] According to some embodiments of the first aspect of the present application, the logic enable pin of the buck-boost control chip is connected to the enable control terminal of the control module.

[0018] According to some embodiments of the first aspect of the present application, the motor drive circuit includes three third dual-gate field effect transistors, second triodes corresponding to the third dual-gate field effect transistors one by one, and motor connection terminals; the first drain and the second drain of the third dual-gate field effect transistor are connected to each other, the second drain of the third dual-gate field effect transistor is connected to the motor connection terminal, and the motor connection terminal is also electrically connected to the drive detection pin of the control module; the first gate terminal of the third dual-gate field effect transistor is connected to the collector of the corresponding second triode, the second gate terminals of the third dual-gate field effect transistors are all connected to the control module, and the second source electrodes corresponding to the second gates in each of the third dual-gate field effect transistors are connected to each other and are all grounded; the emitter of the second triode is grounded, and the base of the second triode is connected to the control module; the first source electrodes corresponding to the first gates in each of the third dual-gate field effect transistors are connected to the second drain of the second dual-gate field effect transistor.

[0019] In a second aspect, a grinding machine according to an embodiment of the present application includes the grinding machine control circuit according to any one of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings are used to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification. They are used together with the embodiments of the present application to explain the technical solutions of the present application, and do not constitute a limitation to the technical solutions of the present application.

[0021] Figure 1 is a schematic diagram of the modules of the grinding machine control circuit provided by the present application;

[0022] Figure 2 is a schematic circuit diagram of the charging circuit in an embodiment of the grinding machine control circuit provided by the present application;

[0023] Figure 3 is a schematic circuit diagram of the power switch circuit module in an embodiment of the grinding machine control circuit provided by the present application;

[0024] Figure 4 is a schematic circuit diagram of the control module in an embodiment of the grinding machine control circuit provided by the present application;

[0025] Figure 5 is a schematic circuit diagram of the digital tube display module in an embodiment of the grinding machine control circuit provided by the present application;

[0026] Figure 6 is a schematic diagram of the motor power supply circuit in an embodiment of the grinding machine control circuit provided by the present application;

[0027] Figure 7It is a schematic diagram of a motor drive circuit in an embodiment of the grinding machine control circuit provided by this application.

[0028] Reference numerals:

[0029] Digital tube display module 100,

[0030] Control module 200,

[0031] Power switch circuit module 300, button control sub-module 310, power supply sub-module 320,

[0032] Charging circuit module 400,

[0033] Motor module 500, motor power supply circuit 510, motor drive circuit 520. Detailed implementation manners

[0034] In order to make the objectives, technical solutions and advantages of this application clearer and more understandable, the following further elaborates on this application in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and the above-mentioned accompanying drawings of this application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence.

[0036] In addition, the described features, structures or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to give a full understanding of the embodiments of the present disclosure. However, those skilled in the art will realize that the technical solutions of the present disclosure can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, well-known methods, devices, implementations or operations are not shown or described in detail to avoid obscuring various aspects of the present disclosure.

[0037] Referring to Figure 1 As shown, the grinding machine control circuit proposed according to the embodiments of this application includes:

[0038] Digital tube display module 100;

[0039] Control module 200, the display control end of the control module 200 is connected to the digital tube display module 100;

[0040] Power switch circuit module 300, the power switch circuit module 300 includes a key control sub-module 310 and a power supply sub-module 320. The key control sub-module 310 is connected to the key switch output end of the control module 200. The voltage input end of the power supply sub-module 320 is used to connect to the battery, and the positive pole of the battery is connected to the voltage detection end of the control module 200;

[0041] Charging circuit module 400, the charging circuit module 400 is connected to the voltage input end of the power supply sub-module 320 and the charging detection end of the control module 200;

[0042] Motor module 500, the motor module 500 is connected to the motor control end of the control module 200. The voltage output end of the power supply sub-module 320 is connected to the control module 200, the digital tube display module 100 and the motor module 500.

[0043] Therefore, by connecting the digital tube display circuit to the control module 200, connecting the charging detection end of the control module 200 to the charging circuit module 400, connecting the voltage detection end of the control module 200 to the positive pole of the battery, and independently setting the key control sub-module and the voltage detection, when the charging circuit module 400 charges the battery, after the control module 200 is started, it can jointly determine whether it is charging and the specific battery power through the voltage detection end and the charging detection end, and the control module can keep the shutdown state when the key switch is closed through the key switch output end. Furthermore, it can still display the charging power in the shutdown state. Therefore, compared with the related technology, the grinding machine corresponding to the grinding machine control circuit in the embodiment of the present application has higher use convenience.

[0044] The digital tube display module 100 is used to display the power according to the instruction output by the display control end of the control module 200. In some embodiments, the digital tube display module 100 is also provided with displays such as rotational speed, rotation direction, and gear. Among them, the displays such as rotational speed, rotation direction, and gear can all be controlled through the display control end.

[0045] The key control sub-module 310 is used to implement the circuit related to the keys on the grinding machine. In some embodiments, the key control sub-module 310 is provided with multiple switches. In this regard, those skilled in the art can selectively set according to actual needs.

[0046] The power supply sub-module 320 is used to supply power to the control module 200, the digital tube display module 100, and the motor module 500.

[0047] The charging circuit module 400 is used to charge the battery. The specific circuit structure of the charging circuit module 400 in the embodiment of the present application is not limited, and those skilled in the art can selectively set according to actual needs. Exemplarily, such as Figure 2As shown in the figure, the charging circuit includes a buck-boost chip and a charging connection terminal. The buck-boost chip is connected to an external charging power supply through the charging connection terminal. The power charging indication pin of the buck-boost chip (i.e., the VCC pin shown in the figure) is connected to the charging detection end of the control module 200, and the battery connection pin of the buck-boost chip (i.e., the BAT pin shown in the figure) is connected to the battery. At this time, the control module 200 detects whether the buck-boost chip is in a charging state through the charging detection end, so as to judge whether charging display is required. Correspondingly, the power sub-module 320 supplies power to the digital tube display module 100, so that the digital tube display module 100 can perform charging display when the control module 200 can send display control information to the digital tube display module 100.

[0048] The embodiment of the present application does not limit the power display method of the digital tube display module 100. In some embodiments, one line in the power icon can be lit when the power is one-quarter, two lines in the power icon can be lit when the power is one-half; three lines in the power icon can be lit when the power is three-quarters; and the entire power icon can be lit when it is fully charged.

[0049] It can be understood that the button control sub-module 310 includes a rotary switch, a first diode, and a first triode. The rotation speed pin of the rotary switch is connected to the control module 200, and the first switch pin of the rotary switch is connected to the cathode of the first diode; the second switch pin of the rotary switch is grounded; the anode of the first diode is connected to the voltage input end of the power sub-module 320 and the collector of the first triode, the emitter of the first triode is grounded, and the base of the first triode is connected to the button switch output end of the control module 200.

[0050] Exemplarily, as Figure 3 shown, the rotary switch is set as S1, the first diode is set as D3, and the first triode is set as Q2. Then, as Figure 3 shown, S1 is provided with two rotation speed pins, which are respectively connected to the SPEED_L pin and the SPEED_R pin of the control module 200 to realize the detection of the rotation speed when the rotary switch rotates clockwise and counterclockwise, and further control the increase and decrease of the rotation speed. The cathode of D3 is connected to the first switch pin of S1, and the anode of D3 is connected to the collector of Q2 and both are connected to the voltage input end of the power sub-module 320. At this time, the base of Q2 can generate different level signals according to the switch state of S1 and send them to the control module 200 through the ON / OFF pin (i.e., the button switch output end).

[0051] It is understandable that the power supply sub-module 320 includes an NMOS transistor and an enhancement-mode field-effect transistor. The gate of the NMOS transistor is connected to the positive electrode of the battery, the source of the NMOS transistor is connected to the positive electrode of the battery, and the drain of the NMOS transistor is connected to the voltage input terminal of the enhancement-mode field-effect transistor and the voltage input terminal of the motor module. The voltage output terminal of the enhancement-mode field-effect transistor is connected to the power supply terminals of the control module 200 and the digital tube display module 100.

[0052] Exemplarily, referring to Figure 3 as shown, the NMOS transistor is set as Q1, and the enhancement-mode field-effect transistor is set as U1. Then, as Figure 3 shown, both the gate and the source of Q1 are connected to the positive electrode of the battery. The positive electrode of the battery is connected to the charging circuit module 400 through the connection terminal J1 to realize charging of the battery. The drain of Q1 is connected to the voltage input terminal of U1 and the voltage input terminal of the motor drive circuit 520. The output terminal of U1 is connected to the power supply terminals of the control module 200 and the digital tube display module 100 to supply power to the control module 200 and the digital tube display module 100 through U1, and the voltage input to the click drive circuit is controlled by Q1.

[0053] It is understandable that the button control sub-module 310 further includes a plurality of gear switches and a first resistor. The first ends of the plurality of gear switches are all grounded, the second ends of the plurality of gear switches are connected to the first end of the first resistor, and the second ends of the plurality of first resistors are connected to each other and connected to the signal detection pin of the control module 200; the resistance values of the respective first resistors are different.

[0054] Exemplarily, referring to Figure 3 as shown, there are 3 gear switches, namely S3, S4, and S4, to realize three-speed regulation through S3, S4, and S4 respectively. Since the resistance values of the first resistors connected to different gear switches are different, the level signals received by the signal detection pin KEY of the control module 200 can be made different, so that different gears can be recognized. In some embodiments, the button control sub-module 310 further includes a third triode D4. The anode of the third triode D4 is connected to the parallel connection end of the first resistor, and the cathode of the third triode D4 is connected to the cathode of D3.

[0055] It is understandable that the button control sub-module 310 further includes a rotation speed direction control switch and a second resistor. The first end of the rotation speed direction control switch is grounded, the second end of the rotation speed direction control switch is connected to the first end of the second resistor, the second end of the second resistor is connected to the second end of the first resistor and connected to the signal detection pin of the control module 200, and the resistance values of the first resistor and the second resistor are different.

[0056] Exemplarily, as Figure 3As shown, the rotation speed direction control switch is set to S2, and the forward and reverse rotation control of the motor can be achieved by setting S2. The second resistor is set to R6.

[0057] It should be understood that the resistance values of the first resistor and the second resistor can be selectively set according to actual needs, and the embodiments of the present application do not limit this.

[0058] It can be understood that the motor module 500 includes a motor power supply circuit 510 and a motor drive circuit 520. The motor power supply circuit 510 is connected to the voltage input terminal of the motor drive circuit 520, and the motor power supply circuit 510 is connected to the voltage control terminal of the control module 200. The motor power supply circuit 510 is used to adjust the voltage input to the voltage input terminal of the motor drive circuit 520 according to the control signal output by the voltage control terminal of the control module 200.

[0059] In some embodiments, the motor power supply circuit 510 is connected to the power supply sub-module 320 to achieve power supply through the power supply sub-module 320. The motor power supply circuit 510 can be set as a buck-boost chip, so that multiple target voltages can be output. The motor drive circuit 520 is used to drive the motor to rotate.

[0060] It can be understood that the motor power supply circuit 510 includes a buck-boost control chip, a first dual-gate field-effect transistor, and a second dual-gate field-effect transistor; the two gates of the first dual-gate field-effect transistor are respectively connected to the first gate drive pin of the buck-boost control chip, the first drain of the first dual-gate field-effect transistor is connected to the drain of the NMOS transistor, and the first source corresponding to the first drain in the first dual-gate field-effect transistor is connected to the first switching node pin of the buck-boost control chip, the first drain of the second dual-gate field-effect transistor, and the second drain of the first dual-gate field-effect transistor; the first drain of the second dual-gate field-effect transistor is connected to the second switching node pin of the buck-boost control chip; the second drain of the second dual-gate field-effect transistor is connected to the voltage input terminal of the motor drive circuit 520, the first source corresponding to the first drain in the second dual-gate field-effect transistor is grounded; the second source corresponding to the second drain in the second dual-gate field-effect transistor is connected to the second switching node pin; the two gates of the second dual-gate field-effect transistor are respectively connected to the second gate drive pin of the buck-boost control chip; the voltage input terminal of the buck-boost control chip is connected to the drain of the NMOS transistor.

[0061] Exemplarily, as Figure 6 shown, the buck-boost control chip is set to U4, the first dual-gate field-effect transistor is set to Q3, and the second dual-gate field-effect transistor is set to Q4. Then, as Figure 6 shown, the voltage input terminal VIN of U4 is connected to Figure 3The drain of Q1, and the two first gate drive pins HD1 and LD1 of U4 are respectively connected to the two gates G1 and G2 of Q3; the two second gate drive pins HD2 and LD2 of U4 are respectively connected to the two gates G1 and G2 of Q4. The first drain D1 of Q3 is electrically connected to the drain of Q1. S1, D2 of Q3, and the second source S2 of Q4 are commonly connected to the second switching node pin of U4; the second source S2 of Q3 is grounded, the first source S1 of Q3 is connected to the first switching node pin of U4, and an inductor L2 is provided between S1 of Q3 and D1 of Q4. The first source S1 of Q4 is grounded, and the second drain D2 of Q4 is used as a voltage output terminal and connected to the voltage input terminal of the motor drive circuit 520. The PWM pin of U4 is connected to the voltage control terminal V-ADJ of the control module 200. At this time, U4 adjusts the voltage at the second drain D2 of Q4 according to the control signal of V-ADJ to achieve the adjustment of the input voltage of the electrode drive circuit.

[0062] It can be understood that the logic enable pin of the buck-boost control chip is connected to the enable control terminal of the control module 200.

[0063] The motor can be immediately shut down by connecting the logic enable pin.

[0064] Exemplarily, as Figure 6 shown, the logic enable pin / CE of U4 is connected to the enable control terminal EN of the control module 200.

[0065] It can be understood that the motor drive circuit 520 includes three third dual-gate field effect transistors, second triodes corresponding to the third dual-gate field effect transistors one by one, and motor connection terminals; the first drain and the second drain of the third dual-gate field effect transistor are connected to each other, the second drain of the third dual-gate field effect transistor is connected to the motor connection terminal, and the motor connection terminal is also electrically connected to the drive detection pin of the control module 200; the first gate terminal of the third dual-gate field effect transistor is connected to the collector of the corresponding second triode, the second gate terminals of the third dual-gate field effect transistors are all connected to the control module 200, and the second sources corresponding to the second gates in each third dual-gate field effect transistor are connected to each other and are all grounded; the emitter of the second triode is grounded, and the base of the second triode is connected to the control module 200; the first sources corresponding to the first gates in each third dual-gate field effect transistor are connected to the second drain of the second dual-gate field effect transistor.

[0066] Exemplarily, as Figure 7 shown, the three third dual-gate field effect transistors are respectively Q6, Q8, and Q10, the second triode connected to Q6 is Q5, the second triode connected to Q8 is Q7, and the second triode connected to Q8 is Q9, as Figure 7As shown, the emitter of Q5 is grounded, the base of Q5 is connected to the AH pin of the control module 200, the collector of Q5 is connected to the first gate G1 of Q6, the second gate of Q6 is connected to the AL pin of the control module 200, the first source S2 of Q6 is connected to the second drain D2 of the second double-gate field-effect transistor. In some embodiments, the first gate G2 of Q6 is also connected to the second drain D2 of the second double-gate field-effect transistor; the second drain D2 and the first drain D1 of Q6 are connected to each other and are both connected to the motor connection terminal J3 to supply power to one phase of the motor. The emitter of Q7 is grounded, the base of Q7 is connected to the BH pin of the control module 200, the collector of Q7 is connected to the first gate G2 of Q8, the second gate G1 of Q8 is connected to the BL pin of the control module 200, the first drain D2 and the second drain D1 of Q8 are connected to each other and are both connected to the motor connection terminal J3 to supply power to one phase of the motor. The emitter of Q9 is grounded, the base of Q9 is connected to the CH pin of the control module 200, the collector of Q9 is connected to the first gate G2 of Q10, the first source of Q10 is grounded, the second gate G1 of Q10 is connected to the CL of the control module 200, the first drain D2 and the second drain D1 of Q10 are connected to each other and are both connected to the motor connection terminal J3 to supply power to one phase of the electrode. The second source S1 of Q8, the second source S1 of Q6, and the second source S1 of Q10 are all grounded. At this time, the control module 200 realizes the conduction and cutoff of Q6, Q8, and Q10 through the AH pin, AL pin, BH pin, BL pin, CH pin, and CL pin, so as to realize the forward and reverse rotation control of the motor.

[0067] In a second aspect, a grinding machine according to an embodiment of the present application includes the above-mentioned grinding machine control circuit.

[0068] Exemplarily, with reference to Figures 2 to 7 Describe the grinding machine control circuit of the embodiment of the present application. Among them, the model of U1 is AM8205, the model of U2 is set to MC51F7424; the model of U3 is set to JW3655E; the model of U4 is set to SC8701; the model of U5 is set to AIP650EO; the digital tube is set to DPY-3019A. Then the principle of the grinding machine control circuit is as follows:

[0069] For buck-boost charging management, with reference to Figure 2 As shown, the 5-12V power supply is input from J2, converted by the charging chip U3, and output from the BAT pin to Figure 3 at J1 in, so as to realize the charging of the battery. The VCC pin of U3 is connected to the CHARGE pin of U2, and at the same time with reference to Figure 3As shown, the BAT pin of U3 is connected to the positive electrode of the battery to detect the battery voltage. The positive electrode of the battery supplies power to the motor power supply circuit 510 through Q1, and the positive electrode of the battery supplies power to the digital tube driving circuit U5 and U2 through U1. Thus, after U2 detects charging through the CHARGE pin and determines the battery power through the BAT pin, with reference to Figure 5 As shown, U2 controls U5 to perform the power of the power icon through the PCK and PDT pins, and U5 then controls the digital tube DS1 to perform the icon power, thereby realizing the charging display.

[0070] For the key switch, such as Figure 3 As shown, the on / off, pause and motor speed control of the grinding machine are controlled by S1; the forward and reverse switching of the motor is controlled by S2; the quick switching of the motor speed is realized by S3 - S5. U2 performs key detection through the KEY pin, and U2 detects the key switch state through ON / OFF. Thus, the control of the motor is realized through the key.

[0071] With reference to Figure 5 As shown, in the digital tube display circuit, U5 is connected to U2 through PCK and PDT to receive the display signal. Different gear icons "HI", "MED" and "LO" are displayed on the digital tube DS1, the motor rotation direction icon is displayed, and the steering "R", "F" and the battery power icon are displayed, so that the motor speed, rotation direction and the whole machine power can be displayed.

[0072] With reference to Figure 4 As shown, U2 is connected to S1, U5 and U4.

[0073] With reference to Figure 6 As shown, for the motor power supply circuit 510, the output voltage can be variable from 3 to 24V. U2 controls U4 to realize the variable voltage and thus realize the motor speed regulation. Among them, U2 controls the power supply output through the EN pin and V-ADJ pin of U4. When the de-enable is input to the EN pin, the voltage supply can be stopped. When the enable signal is input to the EN pin, the normal power supply can be carried out. The V-ADJ pin can control the output voltage size, so that the hardware damage can be avoided by setting the two connection pins respectively.

[0074] With reference to Figure 7 As shown in the motor drive circuit 520. Each phase of the motor connection terminal of the motor drive circuit 520 performs the detection of the motor working state through the BEFM_COM and BEFM_V pins of U2, and abnormal protection such as motor stall and phase loss can be realized. The AH pin, AL pin, BH pin, BL pin, CH pin and CL pin of U2 can control the forward and reverse switching of the motor.

[0075] The above is a specific description of the preferred embodiment of the present application. However, the present application is not limited to the above-mentioned implementation manners. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present application, and these equivalent deformations or substitutions are all included within the scope defined by the claims of the present application.

Claims

1. A grinding machine control circuit, characterized in that, Comprising: Digital tube display module; Control module, the display control end of the control module is connected to the digital tube display module; Power switch circuit module, the power switch circuit module includes a key control sub-module and a power sub-module, the key control sub-module is connected to the key switch output end of the control module, the voltage input end of the power sub-module is used to connect to a battery and the positive pole of the battery is connected to the voltage detection end of the control module; Charging circuit module, the charging circuit module is connected to the voltage input end of the power sub-module and the charging detection end of the control module; Motor module, the motor module is connected to the motor control end of the control module; the voltage output end of the power sub-module is connected to the control module, the digital tube display module and the motor module.

2. The grinding machine control circuit according to claim 1, characterized in that, The key control sub-module includes a rotary switch, a first diode and a first triode, the rotation speed pin of the rotary switch is connected to the control module, and the first switch pin of the rotary switch is connected to the cathode of the first diode; the second switch pin of the rotary switch is grounded; the anode of the first diode is electrically connected to the voltage input end of the power sub-module and the collector of the first triode, the emitter of the first triode is grounded, and the base of the first triode is connected to the key switch output end of the control module.

3. The grinding machine control circuit according to claim 2, wherein, The power sub-module includes an NMOS transistor and an enhancement-mode field-effect transistor, the gate of the NMOS transistor is connected to the positive pole of the battery, the source of the NMOS transistor is connected to the positive pole of the battery, the drain of the NMOS transistor is connected to the voltage input ends of the enhancement-mode field-effect transistor and the motor module, and the voltage output end of the enhancement-mode field-effect transistor is connected to the power supply ends of the control module and the digital tube display module.

4. The grinding machine control circuit according to claim 2, characterized in that, The key control sub-module further includes a plurality of gear switches and a first resistor, the first ends of the plurality of gear switches are all grounded, the second ends of the plurality of gear switches are connected to the first end of the first resistor, the second ends of the plurality of first resistors are connected to each other and are connected to the signal detection pin of the control module; the resistance values of the respective first resistors are different.

5. The grinding machine control circuit according to claim 4, characterized in that The key control sub-module further includes a rotation speed and direction control switch and a second resistor, the first end of the rotation speed and direction control switch is grounded, the second end of the rotation speed and direction control switch is connected to the first end of the second resistor, the second end of the second resistor is connected to the second end of the first resistor and is connected to the signal detection pin of the control module, and the resistance values of the first resistor and the second resistor are different.

6. The grinding machine control circuit according to claim 3, wherein, The motor module includes a motor power supply circuit and a motor drive circuit, the motor power supply circuit is connected to the voltage input end of the motor drive circuit, the motor power supply circuit is connected to the voltage control end of the control module, and the motor power supply circuit is used to adjust the voltage input to the voltage input end of the motor drive circuit according to the control signal output by the voltage control end of the control module.

7. The grinding machine control circuit according to claim 6, characterized in that, The motor power supply circuit includes a buck-boost control chip, a first dual-gate field effect transistor, and a second dual-gate field effect transistor; two gates of the first dual-gate field effect transistor are respectively connected to the first gate drive pin of the buck-boost control chip, a first drain of the first dual-gate field effect transistor is connected to the drain of the NMOS transistor, a first source corresponding to the first drain in the first dual-gate field effect transistor is connected to the first switching node pin of the buck-boost control chip, the first drain of the second dual-gate field effect transistor, and the second drain of the first dual-gate field effect transistor; the first drain of the second dual-gate field effect transistor is connected to the second switching node pin of the buck-boost control chip; the second drain of the second dual-gate field effect transistor is connected to the voltage input terminal of the motor drive circuit, and a first source corresponding to the first drain in the second dual-gate field effect transistor is grounded; a second source corresponding to the second drain in the second dual-gate field effect transistor is connected to the second switching node pin; two gates of the second dual-gate field effect transistor are respectively connected to the second gate drive pin of the buck-boost control chip; the voltage input terminal of the buck-boost control chip is connected to the drain of the NMOS transistor.

8. The grinding machine control circuit according to claim 7, characterized in that The logic enable pin of the buck-boost control chip is connected to the enable control terminal of the control module.

9. The grinding machine control circuit according to claim 7, characterized in that, The motor drive circuit includes three third dual-gate field effect transistors, second triodes corresponding to the third dual-gate field effect transistors one by one, and motor connection terminals; a first drain and a second drain of the third dual-gate field effect transistor are connected to each other, the second drain of the third dual-gate field effect transistor is connected to the motor connection terminal, and the motor connection terminal is also electrically connected to the drive detection pin of the control module; a first gate terminal of the third dual-gate field effect transistor is connected to the collector of the corresponding second triode, a second gate terminal of the third dual-gate field effect transistor is connected to the control module, second sources corresponding to the second gates in each of the third dual-gate field effect transistors are connected to each other and are all grounded; the emitter of the second triode is grounded, and the base of the second triode is connected to the control module; a first source corresponding to the first gate in each of the third dual-gate field effect transistors is connected to the second drain of the second dual-gate field effect transistor.

10. A grinding machine, characterized in that, It includes a grinding machine control circuit according to any one of claims 1 to 9.

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