CN116633212B - Electric grinder, speed regulating circuit of electric grinder and control method of speed regulating circuit - Google Patents
Electric grinder, speed regulating circuit of electric grinder and control method of speed regulating circuit Download PDFInfo
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- CN116633212B CN116633212B CN202310869227.9A CN202310869227A CN116633212B CN 116633212 B CN116633212 B CN 116633212B CN 202310869227 A CN202310869227 A CN 202310869227A CN 116633212 B CN116633212 B CN 116633212B
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 67
- 230000001276 controlling effect Effects 0.000 claims description 23
- 230000000087 stabilizing effect Effects 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 14
- 230000001052 transient effect Effects 0.000 claims description 10
- 238000013507 mapping Methods 0.000 claims description 6
- 230000001960 triggered effect Effects 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 9
- 229910052744 lithium Inorganic materials 0.000 description 9
- 102000005591 NIMA-Interacting Peptidylprolyl Isomerase Human genes 0.000 description 4
- 108010059419 NIMA-Interacting Peptidylprolyl Isomerase Proteins 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 101100190527 Arabidopsis thaliana PIN5 gene Proteins 0.000 description 2
- 101100190530 Arabidopsis thaliana PIN8 gene Proteins 0.000 description 2
- 235000002566 Capsicum Nutrition 0.000 description 2
- 239000004278 EU approved seasoning Substances 0.000 description 2
- 239000006002 Pepper Substances 0.000 description 2
- 241000722363 Piper Species 0.000 description 2
- 235000016761 Piper aduncum Nutrition 0.000 description 2
- 235000017804 Piper guineense Nutrition 0.000 description 2
- 235000008184 Piper nigrum Nutrition 0.000 description 2
- 235000011194 food seasoning agent Nutrition 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005059 dormancy Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007958 sleep Effects 0.000 description 1
- 230000002618 waking effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/063—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current using centrifugal devices, e.g. switch, resistor
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J42/00—Coffee mills; Spice mills
- A47J42/38—Parts or details
- A47J42/46—Driving mechanisms; Coupling to drives
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an electric grinder, a speed regulating circuit of the electric grinder and a control method thereof, wherein the speed regulating circuit of the electric grinder comprises a power supply circuit and a driving circuit, and further comprises a speed regulating control circuit, the speed regulating control circuit comprises a main control chip U4, a tact switch S1, a potentiometer RW1, an eleventh resistor R11 and a twelfth resistor R12, the main control chip U4 is connected between the power supply circuit and the driving circuit and grounded, the main control chip U4 is provided with a wake-up control end and a gear control end, one end of the tact switch S1 is connected with the wake-up control end through the eleventh resistor R11, the other end of the tact switch S1 is grounded, and the tact switch S1 is conducted when pressed; the potentiometer RW1 comprises a fixed terminal and a sliding terminal, one end of the fixed terminal is connected to the power supply circuit through a twelfth resistor R12, the other end of the fixed terminal is grounded, and the sliding terminal is connected with the gear control end. The electric grinder has different grinding speeds and can meet different grinding requirements.
Description
Technical Field
The invention relates to the field of electric grinders, in particular to an electric grinder, a speed regulating circuit of the electric grinder and a control method of the speed regulating circuit.
Background
Most of electric grinders in the market at present grind at a single speed of high speed or low speed, and have no corresponding speed regulation function. Because the grinder is mainly used for grinding some seasonings such as salt, pepper and the like. The thickness of a finished product is determined by the grinding head and the grinding speed, the actual use requirement of a customer cannot be obviously met only by a single speed, and the product is not intelligent and humanized.
Disclosure of Invention
The invention provides a speed regulating circuit of an electric grinder with different grinding speeds and meeting different grinding requirements and a control method thereof, which are realized by the following technical scheme:
the speed regulation circuit of the electric grinder comprises a power supply circuit and a driving circuit, and further comprises a speed regulation control circuit, wherein the speed regulation control circuit comprises a main control chip U4, a tact switch S1, a potentiometer RW1, an eleventh resistor R11 and a twelfth resistor R12, the main control chip U4 is connected between the power supply circuit and the driving circuit and grounded, the main control chip U4 is provided with a wake-up control end and a gear control end, one end of the tact switch S1 is connected with the wake-up control end through the eleventh resistor R11, the other end of the tact switch S1 is grounded, and the tact switch S1 is conducted when pressed; the potentiometer RW1 comprises a fixed terminal and a sliding terminal, one end of the fixed terminal is connected to the power supply circuit through the twelfth resistor R12, the other end of the fixed terminal is grounded, and the sliding terminal is connected with the gear control end.
Further, the power supply circuit comprises a battery and a battery protection circuit, the battery protection circuit comprises a battery protection chip U2, an eighth resistor R8 and a third capacitor C3, one end of the third capacitor C3 is connected with one end of the battery protection chip U2 and one end of the eighth resistor R8, and the other end of the third capacitor C3 is connected with the battery protection chip U2 and grounded; the positive electrode of the battery is connected with the other end of the eighth resistor R8, and the negative electrode of the battery is connected with the other end of the third capacitor C3.
Further, the power supply circuit further includes a voltage stabilizing circuit, the voltage stabilizing circuit includes a voltage stabilizing chip U3, a fourth capacitor C4, and a fifth capacitor C5, one end of the fourth capacitor C4 is connected with one end of the fifth capacitor C5 and the voltage stabilizing chip U3, the other end of the fourth capacitor C4 is connected with the other end of the fifth capacitor C5 and the voltage stabilizing chip U3 and grounded, the other end of the eighth resistor R8 is connected with the voltage stabilizing chip U3, and one end of the fifth capacitor C5 is connected with the twelfth resistor R12 and the main control chip U4.
Further, the power supply circuit further includes a battery voltage detection circuit, the battery voltage detection circuit includes a sixth resistor R6 and a seventh resistor R7, one end of the sixth resistor R6 is connected to the other end of the eighth resistor R8, the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7 and the main control chip U4, and the other end of the seventh resistor R7 is grounded.
Further, the power supply circuit further comprises a charging circuit, the charging circuit comprises a charging chip U1, a first diode D1, a first capacitor C1, a second capacitor C2, a transient diode TVS and a charging interface, the anode of the first diode D1 is connected with the charging interface, the cathode of the first diode D1 is connected with one end of the first capacitor C1 and the charging chip U1, and the other ends of the charging chip U1 and the first capacitor C1 are grounded; one pole of the transient diode TVS is connected to one end of the second capacitor C2, the other end of the eighth resistor R8, and the charging chip U1, and the other pole of the transient diode TVS and the other end of the second capacitor C2 are grounded.
Further, the power supply circuit further comprises a charging indication circuit, the charging indication circuit comprises a third resistor R3, a fourth resistor R4, a first light emitting diode and a second light emitting diode, the anode of the first light emitting diode is connected with the cathode of the first diode D1, the cathode of the first light emitting diode is connected with the charging chip U1 through the third resistor R3, the anode of the second light emitting diode is connected with the cathode of the first diode D1, and the cathode of the second light emitting diode is connected with the charging chip U1 through the fourth resistor R4.
Further, the power supply circuit further comprises a charging detection circuit, the charging detection circuit comprises a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected with the cathode of the first diode D1, the other end of the first resistor R1 is connected with one end of the second resistor R2 and the main control chip U4, and the other end of the second resistor R2 is grounded.
Further, the driving circuit includes a motor, a ninth resistor R9, a tenth resistor R10, a second diode D2, a sixth capacitor C6, and a first MOS tube, a gate of the first MOS tube is connected to one end of the ninth resistor R9 and one end of the tenth resistor R10, the other end of the ninth resistor R9 is connected to the main control chip U4, the other end of the tenth resistor R10 and a source of the first MOS tube are grounded, a drain of the first MOS tube is connected to an anode of the second diode D2, one end of the sixth capacitor C6 and a cathode of the motor, an anode of the motor is connected to a cathode of the second diode D2 and the other end of the sixth capacitor C6, and the other end of the sixth capacitor C6 is connected to the other end of the eighth resistor R8.
Further, the speed regulating circuit further comprises a work indicating circuit, the work indicating circuit comprises a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a second MOS tube and a third light emitting diode, the anode of the third light emitting diode is connected with the other end of the eighth resistor R8, the grid electrode of the second MOS tube is connected with one end of the thirteenth resistor R13 and one end of the fourteenth resistor R14, the other end of the thirteenth resistor R13 is connected with the main control chip U4, the other end of the fourteenth resistor R14 is grounded, the source electrode of the second MOS tube is grounded, the drain electrode of the second MOS tube is connected with the cathode of the third light emitting diode through the fifteenth resistor R15, and the anode of the third light emitting diode is connected with the anode of the battery.
The control method of the speed regulating circuit of the electric grinder is applied to the speed regulating circuit of the electric grinder, and comprises the following steps:
acquiring a state signal of the tact switch S1, wherein the state signal comprises an off signal and an on signal, and the on signal is triggered when the tact switch S1 is pressed;
when the state signal is the conducting signal, acquiring the current resistance value of the potentiometer RW1, wherein a mapping relationship exists between the resistance value of the potentiometer RW1 and the motor rotation speed;
and controlling the motor to rotate according to the corresponding speed according to the resistance value of the potentiometer RW 1.
Further, the step of controlling the motor to rotate according to the corresponding speed according to the resistance value of the potentiometer RW1 includes:
determining the target speed of the motor rotation according to the resistance value of the potentiometer RW1 and the mapping relation;
and controlling the motor to rotate according to the target speed, and controlling the third light emitting diode to emit light.
Further, before the step of obtaining the current resistance value of the potentiometer RW1, the method further includes:
detecting a current battery voltage value;
executing the step of acquiring the current resistance value of the potentiometer RW1 when the battery voltage value is greater than or equal to a preset voltage lower limit value;
and when the battery voltage value is smaller than the preset voltage lower limit value, controlling the motor to stop rotating, and controlling the third light emitting diode to be turned off.
Further, before the step of acquiring the status signal of the tact switch S1, the method further includes:
identifying whether a charging power supply is connected;
if yes, comparing the current battery voltage value with a preset voltage upper limit value;
when the battery voltage value is greater than or equal to the preset voltage upper limit value, the first light-emitting diode is controlled to be turned off, and the second light-emitting diode is controlled to be turned on;
when the battery voltage value is smaller than the preset voltage upper limit value, the first light-emitting diode is controlled to be turned on, and the second light-emitting diode is controlled to be turned off;
returning to execute the step of identifying whether the charging power supply is connected;
if not, executing the step of acquiring the state signal of the tact switch S1.
An electric motor-driven grinder comprising a speed regulating circuit as claimed in any one of the preceding claims.
The design has the following advantages: according to the invention, the tact switch S1 is arranged in the control circuit to control the work of the electric grinder, and meanwhile, the potentiometer RW1 is arranged in the control circuit, so that the electric grinder has the selection of a plurality of continuous different working rotating speeds, the thickness suitable for the actual needs of customers can be ground, the actual grinding needs of the customers in different occasions are met, and the electric grinder is more flexible to use.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a speed regulation circuit of an electric grinder according to the present invention;
fig. 2 is a flow chart of an embodiment of a control method of a speed regulating circuit of the electric grinder of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and detailed description.
As shown in fig. 1, the embodiment provides a speed regulating circuit of an electric grinder, which comprises a power supply circuit and a driving circuit, and further comprises a speed regulating control circuit, wherein the speed regulating control circuit comprises a main control chip U4, a tact switch S1, a potentiometer RW1, an eleventh resistor R11 and a twelfth resistor R12, the main control chip U4 is connected between the power supply circuit and the driving circuit, the 8 th pin of the main control chip U4 is grounded, one end of the tact switch S1 is connected with the 7 th pin of the main control chip U4 through the eleventh resistor R11, the other end of the tact switch S1 is grounded, and the tact switch S1 is turned on when pressed; the potentiometer RW1 includes a fixed terminal and a sliding terminal, one end of the fixed terminal is connected to the power supply circuit through the twelfth resistor R12, the other end of the fixed terminal is grounded, and the sliding terminal is connected to the 2 nd pin of the main control chip U4.
Further, the driving circuit includes a motor, a ninth resistor R9, a tenth resistor R10, a second diode D2, a sixth capacitor C6, and a first MOS tube, where a gate of the first MOS tube is connected to one end of the ninth resistor R9 and one end of the tenth resistor R10, the other end of the ninth resistor R9 is connected to the 5 th pin of the main control chip U4, the other end of the tenth resistor R10 and a source of the first MOS tube are grounded, a drain of the first MOS tube is connected to an anode of the second diode D2, one end of the sixth capacitor C6, and a cathode of the motor, an anode of the motor is connected to a cathode of the second diode D2 and the other end of the sixth capacitor C6, and the other end of the sixth capacitor C6 is connected to the other end of the eighth resistor R8.
Specifically, the structure of the electric grinder comprises a shell, a power mechanism (motor) arranged in the shell and a grinding mechanism (grinding head) arranged at the output end of the power mechanism. The shell is also internally provided with a switch circuit board, and the shell is provided with a key for controlling the rotation of the motor.
In this embodiment, the twelfth resistor R12 and the potentiometer RW1 form a stepless speed regulation input line; the eleventh resistor R11 and the tact switch S1 constitute an operation start input line. The potentiometer RW1 is a resistor element with three output ends and a resistance value which can be adjusted according to a certain change rule. The potentiometer RW1 is generally composed of a resistor body (fixed terminal) and a movable brush (sliding terminal). The rotation speed of the motor can be continuously adjusted by changing the resistance value of the potentiometer RW1 connected into the circuit.
The specific use modes of the electric grinder comprise the following.
Pressing a tact switch S1, waking up from dormancy by an MCU (main control chip U4), adjusting a potentiometer RW1 to select a required grinding speed, and pushing an N-MOSFET field effect transistor to drive a MOTOR (MOTOR) by the MCU (main control chip U4) according to the selected output corresponding PWM pulse width to perform grinding work; when stopping is needed, the tact switch S1 is loosened, when the MCU (main control chip U4) detects a stopping command, the operation of the MOTOR (MOTOR) is stopped immediately, and the whole machine is in a working state to enter a sleep mode again.
In this embodiment, through setting up the tact switch S1 in control circuit, control the work of electric grinder, simultaneously, be provided with potentiometre RW1 in the control circuit for electric grinder has continuous multiple different work rotational speed selections, can grind out the thickness that is fit for customer' S actual need, satisfies the actual grinding demand of customer in different occasions, uses more nimble.
On the driving circuit, the second diode D2 plays a role of freewheeling, and the sixth capacitor C6 plays a role of suppressing high-frequency harmonics. Through using the MOTOR drive circuit of 1N-MOSFET, dispose freewheeling diode D2 and high frequency capacitor C6 and protect, the circuit is safe and reliable, easy and practical to handle.
Further, the power supply circuit comprises a battery and a battery protection circuit, the battery protection circuit comprises a battery protection chip U2, an eighth resistor R8 and a third capacitor C3, one end of the third capacitor C3 is connected with the 1 st pin of the battery protection chip U2 and one end of the eighth resistor R8, the other end of the third capacitor C3 is connected with the 2 nd pin and the 3 rd pin of the battery protection chip U2, the 2 nd pin and the 3 rd pin of the battery protection chip U2 are simultaneously grounded, and the 4 th pin and the 5 th pin of the battery protection chip U2 are simultaneously grounded; the positive electrode of the battery is connected with the other end of the eighth resistor R8, and the negative electrode of the battery is connected with the other end of the third capacitor C3.
In the embodiment, the battery protection circuit has the functions of over-charge and over-current protection and output short-circuit protection of the lithium battery, and ensures the use safety of users.
Further, the power supply circuit further includes a voltage stabilizing circuit, the voltage stabilizing circuit includes a voltage stabilizing chip U3, a fourth capacitor C4, and a fifth capacitor C5, one end of the fourth capacitor C4 is connected with one end of the fifth capacitor C5 and a 2 nd pin of the voltage stabilizing chip U3, the other end of the fourth capacitor C4 is connected with the other end of the fifth capacitor C5 and a 1 st pin of the voltage stabilizing chip U3 and grounded, the other end of the eighth resistor R8 is connected with a 3 rd pin of the voltage stabilizing chip U3, and one end of the fifth capacitor C5 is connected with a twelfth resistor R12 and the main control chip U4.
In this embodiment, the voltage stabilizing circuit is used for supplying power to the main control chip U4 stably, and the whole circuit operates stably and reliably.
Further, the power supply circuit further includes a battery voltage detection circuit, the battery voltage detection circuit includes a sixth resistor R6 and a seventh resistor R7, one end of the sixth resistor R6 is connected to the other end of the eighth resistor R8, the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7 and the 4 th pin of the main control chip U4, and the other end of the seventh resistor R7 is grounded.
In this embodiment, when the MCU (the main control chip U4) detects that the voltage of the lithium battery is too low, the response operation is stopped, and the MOTOR is stopped, so as to achieve the purpose of protecting the lithium battery. The whole machine circuit is simple and practical, safe and reliable.
Further, the power supply circuit further comprises a charging circuit, the charging circuit comprises a charging chip U1, a first diode D1, a first capacitor C1, a second capacitor C2, a fifth resistor R5, a transient diode TVS and a charging interface, the anode of the first diode D1 is connected with the charging interface, the cathode of the first diode D1 is connected with one end of the first capacitor C1 and the 4 th pin of the charging chip U1, the 2 nd pin of the charging chip U1 and the other end of the first capacitor C1 are grounded, and the 6 th pin of the charging chip U1 is grounded through the fifth resistor R5; one pole of the transient diode TVS is connected to one end of the second capacitor C2, the other end of the eighth resistor R8, and the 3 rd pin of the charging chip U1, and the other pole of the transient diode TVS and the other end of the second capacitor C2 are grounded.
Further, the power supply circuit further comprises a charging indication circuit, the charging indication circuit comprises a third resistor R3, a fourth resistor R4, a first light emitting diode and a second light emitting diode, the anode of the first light emitting diode is connected with the cathode of the first diode D1, the cathode of the first light emitting diode is connected with the 5 th pin of the charging chip U1 through the third resistor R3, the anode of the second light emitting diode is connected with the cathode of the first diode D1, and the cathode of the second light emitting diode is connected with the 1 st pin of the charging chip U1 through the fourth resistor R4.
In the embodiment, the charging chip U1, the first diode D1, the first capacitor C1, the second capacitor C2, and the transient diode TVS form a charging circuit, and the third resistor R3, the fourth resistor R4, and the red and white LEDs 1 (the first light emitting diode, the second light emitting diode) form a charging indication circuit. When the charging power supply 5VDC is sent to the charging chip U1 through the first diode D1, the charging chip U1 charges the lithium battery, meanwhile, the PIN1 of the charging chip U1 is set to be low level, the red part (first light emitting diode) of the LED1 is lightened, and a circuit is indicated to be charged; when the charging chip U1 detects that the lithium battery is full, the charging chip U1 stops charging, PIN1 is reset to a high level, PIN5 is set to a low level, the red part (first light emitting diode) of the LED1 is turned off, and the white part (second light emitting diode) is turned on, indicating that charging is finished.
Further, the power supply circuit further comprises a charging detection circuit, the charging detection circuit comprises a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected with the cathode of the first diode D1, the other end of the first resistor R1 is connected with one end of the second resistor R2 and the 6 th pin of the main control chip U4, and the other end of the second resistor R2 is grounded.
In this embodiment, by the charge detection circuit, whether a charging power source is connected or not can be identified. When the charging power supply is identified to be connected, namely the electric grinder is charged, the whole machine cannot work; when no charging power is identified to be connected, the whole machine can work normally. The charging is quick and safe, the whole machine line is stable and reliable to run, and the operation of a user is convenient.
Further, the speed regulating circuit further comprises a work indicating circuit, the work indicating circuit comprises a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a second MOS tube and a third light emitting diode, the anode of the third light emitting diode is connected with the other end of the eighth resistor R8, the grid electrode of the second MOS tube is connected with one end of the thirteenth resistor R13 and one end of the fourteenth resistor R14, the other end of the thirteenth resistor R13 is connected with the 3 rd pin of the main control chip U4, the other end of the fourteenth resistor R14 is grounded, the source electrode of the second MOS tube is grounded, the drain electrode of the second MOS tube is connected with the cathode of the third light emitting diode through the fifteenth resistor R15, and the anode of the third light emitting diode is connected with the anode of the battery.
When the MOTOR is running, the white LED2 (third light emitting diode) of the operation indicator light is turned on, and stops to be turned off.
As shown in fig. 2, the present embodiment provides a control method of a speed regulating circuit of an electric grinder, which is applied to the speed regulating circuit of the electric grinder, and includes the following steps:
s100, acquiring a state signal of the tact switch S1, wherein the state signal comprises an off signal and an on signal, and the on signal is triggered when the tact switch S1 is pressed;
s200, when the state signal is the conduction signal, acquiring the current resistance value of the potentiometer RW1, wherein a mapping relationship exists between the resistance value of the potentiometer RW1 and the motor rotation speed;
and S300, controlling the motor to rotate according to the corresponding speed according to the resistance value of the potentiometer RW 1.
In this embodiment, the operation flow of the electric grinder is as follows.
Grinding: adding salt, pepper or other seasonings into the cavity, covering the cavity with a cover, adjusting the grinding speed, and pressing a touch button to grind;
stopping grinding: after finishing grinding, the touch switch is released, so that the MOTOR operation can be stopped, and the whole machine enters a dormant standby state again.
Further, the step S300 includes:
s310, determining the target speed of the motor rotation according to the resistance value of the potentiometer RW1 and the mapping relation;
s320, controlling the motor to rotate according to the target speed, and controlling the third light emitting diode to emit light.
In this embodiment, when the MOTOR is running, the white LED2 (third LED) of the operation indicator light is turned on, and stops to be turned off.
Further, before the step S200, the method further includes:
s410, detecting the current battery voltage value;
s420, executing the step of acquiring the current resistance value of the potentiometer RW1 when the battery voltage value is greater than or equal to a preset voltage lower limit value;
and S430, when the battery voltage value is smaller than the preset voltage lower limit value, controlling the motor to stop rotating, and controlling the third light emitting diode to be turned off.
In this embodiment, when the MCU (the main control chip U4) detects that the voltage of the lithium battery is too low, the response operation is stopped, and the MOTOR is stopped, so as to achieve the purpose of protecting the lithium battery. The whole machine circuit is simple and practical, safe and reliable.
Further, before the step S100, the method further includes:
s500, identifying whether a charging power supply is connected;
if yes, S510, comparing the current battery voltage value with the preset upper voltage limit value;
s511, when the battery voltage value is greater than or equal to the preset voltage upper limit value, controlling the first light-emitting diode to be turned off and the second light-emitting diode to be turned on;
s512, when the battery voltage value is smaller than the preset voltage upper limit value, the first light-emitting diode is controlled to be lightened, and the second light-emitting diode is controlled to be extinguished;
s513, returning to execute the step S500;
if not, the step S100 is executed.
In this embodiment, when the charging power supply 5VDC is sent to the charging chip U1 through the first diode D1, the charging chip U1 charges the lithium battery, and meanwhile, the PIN1 of the charging chip U1 is set to a low level, the red portion (first light emitting diode) of the LED1 is turned on, and the line is indicated to be in charging; when the charging chip U1 detects that the lithium battery is full, the charging chip U1 stops charging, PIN1 is reset to a high level, PIN5 is set to a low level, the red part (first light emitting diode) of the LED1 is turned off, and the white part (second light emitting diode) is turned on, indicating that charging is finished.
By means of the charging detection circuit, whether a charging power supply is connected or not can be identified. When the charging power supply is identified to be connected, namely the electric grinder is charged, the whole machine cannot work; when no charging power is identified to be connected, the whole machine can work normally. The charging is quick and safe, the whole machine line is stable and reliable to run, and the operation of a user is convenient.
The foregoing detailed description is directed to embodiments of the invention, and is not intended to limit the scope of the invention, but rather to cover all modifications and variations within the scope of the invention.
Claims (9)
1. The utility model provides a speed governing circuit of electric grinder, includes power supply circuit and drive circuit, its characterized in that: the speed regulation control circuit comprises a main control chip U4, a tact switch S1, a potentiometer RW1, an eleventh resistor R11 and a twelfth resistor R12, wherein the main control chip U4 is connected between the power supply circuit and the driving circuit and grounded, the main control chip U4 is provided with a wake-up control end and a gear control end, one end of the tact switch S1 is connected with the wake-up control end through the eleventh resistor R11, the other end of the tact switch S1 is grounded, and the tact switch S1 is conducted when pressed; the potentiometer RW1 comprises a fixed terminal and a sliding terminal, one end of the fixed terminal is connected into the power supply circuit through the twelfth resistor R12, the other end of the fixed terminal is grounded, and the sliding terminal is connected with the gear control end;
the power supply circuit comprises a battery and a battery protection circuit, the battery protection circuit comprises a battery protection chip U2, an eighth resistor R8 and a third capacitor C3, one end of the third capacitor C3 is connected with one end of the battery protection chip U2 and one end of the eighth resistor R8, and the other end of the third capacitor C3 is connected with the battery protection chip U2 and grounded; the positive electrode of the battery is connected with the other end of the eighth resistor R8, and the negative electrode of the battery is connected with the other end of the third capacitor C3; the battery protection circuit has the functions of overcharge and overcurrent of the battery and output short-circuit protection;
the power supply circuit further comprises a battery voltage detection circuit, the battery voltage detection circuit comprises a sixth resistor R6 and a seventh resistor R7, one end of the sixth resistor R6 is connected with the other end of the eighth resistor R8, the other end of the sixth resistor R6 is connected with one end of the seventh resistor R7 and the main control chip U4, and the other end of the seventh resistor R7 is grounded; when the main control chip U4 detects that the battery voltage is too low, controlling a motor of the driving circuit to stop rotating;
the power supply circuit further comprises a voltage stabilizing circuit, the voltage stabilizing circuit comprises a voltage stabilizing chip U3, a fourth capacitor C4 and a fifth capacitor C5, one end of the fourth capacitor C4 is connected with one end of the fifth capacitor C5 and the voltage stabilizing chip U3, the other end of the fourth capacitor C4 is connected with the other end of the fifth capacitor C5 and the voltage stabilizing chip U3 and grounded, the other end of the eighth resistor R8 is connected with the voltage stabilizing chip U3, and one end of the fifth capacitor C5 is connected with the twelfth resistor R12 and the main control chip U4;
the power supply circuit further comprises a charging circuit, the charging circuit comprises a charging chip U1, a first diode D1, a first capacitor C1, a second capacitor C2, a transient diode TVS and a charging interface, the anode of the first diode D1 is connected with the charging interface, the cathode of the first diode D1 is connected with one end of the first capacitor C1 and the charging chip U1, and the other ends of the charging chip U1 and the first capacitor C1 are grounded; one pole of the transient diode TVS is connected to one end of the second capacitor C2, the other end of the eighth resistor R8, and the charging chip U1, and the other pole of the transient diode TVS and the other end of the second capacitor C2 are grounded;
the power supply circuit further comprises a charging indication circuit, the charging indication circuit comprises a third resistor R3, a fourth resistor R4, a first light emitting diode and a second light emitting diode, the anode of the first light emitting diode is connected with the cathode of the first diode D1, the cathode of the first light emitting diode is connected with the charging chip U1 through the third resistor R3, the anode of the second light emitting diode is connected with the cathode of the first diode D1, and the cathode of the second light emitting diode is connected with the charging chip U1 through the fourth resistor R4.
2. The electric grinder speed regulation circuit according to claim 1, wherein: the power supply circuit further comprises a charging detection circuit, the charging detection circuit comprises a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected with the cathode of the first diode D1, the other end of the first resistor R1 is connected with one end of the second resistor R2 and the main control chip U4, and the other end of the second resistor R2 is grounded.
3. The electric grinder speed regulation circuit according to claim 1, wherein: the driving circuit comprises a motor, a ninth resistor R9, a tenth resistor R10, a second diode D2, a sixth capacitor C6 and a first MOS tube, wherein the grid electrode of the first MOS tube is connected with one end of the ninth resistor R9 and one end of the tenth resistor R10, the other end of the ninth resistor R9 is connected with the main control chip U4, the other end of the tenth resistor R10 and the source electrode of the first MOS tube are grounded, the drain electrode of the first MOS tube is connected with the anode of the second diode D2, one end of the sixth capacitor C6 and the cathode of the motor, the anode of the motor is connected with the cathode of the second diode D2 and the other end of the sixth capacitor C6, and the other end of the sixth capacitor C6 is connected with the other end of the eighth resistor R8.
4. The electric grinder speed regulation circuit according to claim 1, wherein: the speed regulation circuit further comprises a work indication circuit, the work indication circuit comprises a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a second MOS tube and a third light-emitting diode, the anode of the third light-emitting diode is connected with the other end of the eighth resistor R8, the grid electrode of the second MOS tube is connected with one end of the thirteenth resistor R13 and one end of the fourteenth resistor R14, the other end of the thirteenth resistor R13 is connected with the main control chip U4, the other end of the fourteenth resistor R14 is grounded, the source electrode of the second MOS tube is grounded, the drain electrode of the second MOS tube is connected with the cathode of the third light-emitting diode through the fifteenth resistor R15, and the anode of the third light-emitting diode is connected with the anode of the battery.
5. The control method of the speed regulating circuit of the electric grinder, which is applied to the speed regulating circuit of the electric grinder as set forth in claim 4, is characterized in that: the method comprises the following steps:
acquiring a state signal of the tact switch S1, wherein the state signal comprises an off signal and an on signal, and the on signal is triggered when the tact switch S1 is pressed;
when the state signal is the conducting signal, acquiring the current resistance value of the potentiometer RW1, wherein a mapping relationship exists between the resistance value of the potentiometer RW1 and the motor rotation speed;
according to the resistance value of the potentiometer RW1, controlling a motor to rotate at a corresponding speed;
before the step of obtaining the current resistance value of the potentiometer RW1, the method further includes:
detecting a current battery voltage value;
executing the step of acquiring the current resistance value of the potentiometer RW1 when the battery voltage value is greater than or equal to a preset voltage lower limit value;
and when the battery voltage value is smaller than the preset voltage lower limit value, controlling the motor to stop rotating.
6. The method of controlling the speed regulating circuit of the electric grinder according to claim 5, wherein: the step of controlling the motor to rotate at a corresponding speed according to the resistance value of the potentiometer RW1 includes:
determining the target speed of the motor rotation according to the resistance value of the potentiometer RW1 and the mapping relation;
and controlling the motor to rotate according to the target speed, and controlling the third light emitting diode to emit light.
7. The method of controlling the speed regulating circuit of the electric grinder according to claim 5, wherein:
and when the battery voltage value is smaller than the preset voltage lower limit value, controlling the third light-emitting diode to be turned off.
8. The method of controlling the speed regulating circuit of the electric grinder according to claim 5, wherein: before the step of obtaining the state signal of the tact switch S1, the method further includes:
identifying whether a charging power supply is connected;
if yes, comparing the current battery voltage value with a preset voltage upper limit value;
when the battery voltage value is greater than or equal to the preset voltage upper limit value, the first light-emitting diode is controlled to be turned off, and the second light-emitting diode is controlled to be turned on;
when the battery voltage value is smaller than the preset voltage upper limit value, the first light-emitting diode is controlled to be turned on, and the second light-emitting diode is controlled to be turned off;
returning to execute the step of identifying whether the charging power supply is connected;
if not, executing the step of acquiring the state signal of the tact switch S1.
9. An electric grinder, comprising a speed regulating circuit according to any one of claims 1 to 4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310869227.9A CN116633212B (en) | 2023-07-17 | 2023-07-17 | Electric grinder, speed regulating circuit of electric grinder and control method of speed regulating circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310869227.9A CN116633212B (en) | 2023-07-17 | 2023-07-17 | Electric grinder, speed regulating circuit of electric grinder and control method of speed regulating circuit |
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| CN116633212A CN116633212A (en) | 2023-08-22 |
| CN116633212B true CN116633212B (en) | 2024-03-01 |
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| CN216025439U (en) * | 2021-10-19 | 2022-03-15 | 深圳市车安达机电有限公司 | Grinding machine with illumination function |
| CN216122269U (en) * | 2021-02-23 | 2022-03-22 | 珠海瑞杰电子科技有限公司 | Low-cost high-reliability motor control circuit of household grinder |
| CN217087804U (en) * | 2022-04-20 | 2022-07-29 | 浙江科泰电气有限公司 | Electric tool speed regulation module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4905300A (en) * | 1987-05-21 | 1990-02-27 | Black & Decker Inc. | Motor control and power systems and methods of operation thereof |
| CN206211596U (en) * | 2016-11-11 | 2017-05-31 | 常州市武进大成工贸有限公司 | Mini electric mill lithium battery alignment circuit |
| CN206743149U (en) * | 2017-05-27 | 2017-12-12 | 浙江卓远机电科技有限公司 | Make the high-low double-speed control circuit on the garden instrument of driving power with battery bag |
| CN216122269U (en) * | 2021-02-23 | 2022-03-22 | 珠海瑞杰电子科技有限公司 | Low-cost high-reliability motor control circuit of household grinder |
| CN113693459A (en) * | 2021-08-31 | 2021-11-26 | 珠海市科力通电器有限公司 | Electric pepper grinder |
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|---|---|
| CN116633212A (en) | 2023-08-22 |
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