CN113013840A - Water shortage protection circuit and method for tooth washing device - Google Patents
Water shortage protection circuit and method for tooth washing device Download PDFInfo
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- CN113013840A CN113013840A CN202110209479.XA CN202110209479A CN113013840A CN 113013840 A CN113013840 A CN 113013840A CN 202110209479 A CN202110209479 A CN 202110209479A CN 113013840 A CN113013840 A CN 113013840A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 238000005406 washing Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000001514 detection method Methods 0.000 claims abstract description 28
- 238000005070 sampling Methods 0.000 claims description 62
- 239000003990 capacitor Substances 0.000 claims description 8
- 235000010585 Ammi visnaga Nutrition 0.000 claims description 7
- 244000153158 Ammi visnaga Species 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims 1
- 229910052744 lithium Inorganic materials 0.000 claims 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011321 prophylaxis Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0827—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors responsive to underload or no-load, e.g. pump-off control circuits for pump motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
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Abstract
The invention discloses a water shortage protection circuit and method for a tooth washing device, and belongs to the technical field of protection circuits. The invention relates to a water shortage protection circuit and a water shortage protection method for a tooth washing device, which comprises a micro control unit, a complete machine power supply system, a motor driving unit, a voltage detection unit and a voltage comparison unit, wherein a single chip Microcomputer (MCU) is used for reading voltage values or voltage value changes at two ends of a battery, so that the motor can be known to work in a water-free or water-containing state, the motor driving unit is timely turned off, the circuit is protected, the driving unit is prevented from idling, and the service life of the driving unit is prolonged.
Description
Technical Field
The invention relates to the technical field of protection circuits, in particular to a water shortage protection circuit and a water shortage protection method for a tooth washing device.
Background
The hand-held type tooth cleaning device on the market at present often is the water tank formula structure, and the water tank of this kind of structure has made things convenient for to a certain extent to use and carry, still has a great deal of defect: in the using process, if the water in the water tank is used up, the motor in the tooth washing device is in an idle state, the armature current of the motor is large, and if the tooth washing device is not turned off in time, on one hand, the machine runs for a long time and consumes electric quantity; on the other hand, the large idle current can heat the internal components of the tooth washing device, and reduce the service life of the motor. In addition, most of the hand-held tooth cleaners sold on the market at present have no water shortage protection function, and need to be shut down manually to cut off the power supply and the motor, or adopt a special sensor or device to detect water shortage, so that the hardware burden is increased inevitably. Therefore, there is a need for a circuit and method for automatically turning off or cutting off the power supply of a motor in case of water shortage, which can timely turn off and protect the tooth washing device in case of water shortage.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to provide a water shortage protection circuit and a method of a tooth washing device with real-time protection characteristic. The hand-held type tooth cleaning device on the market at present often is the water tank formula structure, and the water tank of this kind of structure has made things convenient for to a certain extent to use and carry, still has a great deal of defect: in the using process, if the water in the water tank is used up, the motor in the tooth washing device is in an idle state, the armature current of the motor is large, and if the tooth washing device is not turned off in time, on one hand, the machine runs for a long time and consumes electric quantity; on the other hand, the large idle current can heat the internal components of the tooth washing device, and reduce the service life of the motor. In addition, most of the hand-held tooth cleaners sold on the market at present have no water shortage protection function, and need to be shut down manually to cut off the power supply and the motor, or adopt a special sensor or device to detect water shortage, so that the hardware burden is increased inevitably. Therefore, there is a need for a circuit and method for automatically turning off or cutting off the power supply of a motor in case of water shortage, which can timely turn off and protect the tooth washing device in case of water shortage.
2. Technical scheme
In order to solve the technical problems, the invention adopts the following technical scheme:
a water shortage protection circuit and method for a tooth washing device comprise a micro control unit, a complete machine power supply system, a motor driving unit, a voltage detection unit and a voltage comparison unit. The micro control unit uses a Micro Control Unit (MCU) for realizing the complete machine logic function of the hand-held tooth washing device, and is also used as a micro control unit for realizing the water shortage protection circuit and the method function of the tooth washing device; the complete machine power supply system provides energy for the complete machine function; the motor driving unit provides proper working conditions for the motor inside the hand-held tooth washing device; the voltage detection unit is used for acquiring voltage signals at two ends of the battery and transmitting the acquired voltage signals to the voltage comparison unit to be compared with a preset reference voltage; the voltage comparison unit is structurally a voltage comparator, compares the sampling voltage with a preset voltage and then outputs a voltage signal to the MCU, and the MCU stops supplying power to the motor and gives a prompt signal that the water tank needs to be supplemented with water according to interruption generated by the voltage signal.
Preferably, the water shortage protection circuit of the water toothpick comprises: the device comprises a whole machine power supply voltage VBAT, motor welding points PD1 and PD2, an NMOS tube U6(U1), a Schottky diode D1, a Schottky diode D2, a Schottky diode D3, a Schottky diode D4, a switch S1, a switch S2, a switch S3, a single-chip microcomputer current limiting resistor R1(R1), a grid G, a pull-down resistor R2(R2), a sampling resistor R3(R3), a resistor R4(R4) and a capacitor C1 (C1). The pin 5 of the schottky diode D1, the pin 6 of the schottky diode D2, the pin 7 of the schottky diode D3, and the pin 8 of the schottky diode D4 are connected to the schottky diode D3 and the motor. The 4 feet of the grid G are connected with the singlechip current limiting resistor R1 and the pull-down resistor R2, and the pull-down resistor R2 is grounded. The pin 1 of the switch S1, the pin 2 of the switch S2 and the pin 3 of the switch S3 are connected with the resistor R4 and the sampling resistor R3, the sampling resistor R3 is grounded, and the circuit also comprises a voltage detection unit and a voltage comparison unit.
Preferably, the voltage detection unit includes two sets of emitter followers U1A and U1B, an operational amplifier U1C, and resistors R11, R12, R13, R14, R15, and R16, where R11 and R12 are used to pull up the base voltage, so that the sampling voltage obtained by the voltage detection unit is within a reasonable interval range (0-3.3V), where the emitter follower U1A is connected to one end of the sampling resistor R3, the emitter follower U2A is connected to the pulled-up base voltage, and the output is the sampling voltage processed at one end of the sampling resistor.
Preferably, the voltage comparison unit includes a voltage comparator U2A, a forward input terminal of the comparator U2A is connected to the MCU, a forward input terminal voltage of the comparator U2 is a preset voltage value designed according to a product, a reverse input terminal of the comparator U2A is connected to an output terminal of the voltage detection unit, and an output terminal of the comparator U2A is connected to the MCU, so that the comparator U outputs 0 or 1 according to a relative magnitude of the forward input terminal voltage and the reverse input terminal voltage, and after the voltage signal is collected by the MCU, the voltage level of the MOTO _ EN is correspondingly controlled.
Preferably, the battery voltage VBAT described in 2 is passed through the motor, NMOS transistor U6, and sampling resistor R3 to ground. The high and low levels of the MOTO _ EN are controlled by the single chip microcomputer in a micro mode, so that the connection and disconnection of the NMOS tube U6 are controlled in a micro mode, and the on and off of the motor are achieved.
Preferably, the schottky diode D3 is a motor electromotive force bleeder circuit, and the pull-down resistor R2 provides stable pull-down for the NMOS transistor U6, so as to ensure that the monolithic computer is in a turn-off state, and the G pole of the NMOS is in a pull-down turn-off state, thereby ensuring the stability of the NMOS.
Preferably, when the motor works normally, the current flows to the ground through the sampling resistor R3, and the sampling resistor R3 generates voltage for the singlechip to read the voltage value
Preferably, the resistor R4 and the capacitor C1 form an RC filter circuit to provide a stable voltage value for the AD pin of the single chip microcomputer.
Preferably, the water shortage protection method for the tooth washing device is characterized by comprising the following steps:
the method comprises the following steps: collecting a primary battery voltage value V1 before the motor works;
step two: waiting for the motor to work stably;
step three: intermittently collecting the battery voltage V2 in the output;
step four: detecting a maximum value V2max and a minimum value V2min of V2 in one detection period, and taking V2max-V2min as a variable quantity V3 of V2;
step five: if V1-V2 is smaller than the set value and V3 is smaller than the set value, shutting down the machine in case of water shortage; if V1-V2 is larger than the set value, or V3 is larger than the set value, the machine normally operates, the third step of operation is continued, and the operation is repeated in a circulating mode to protect the circuit.
Preferably, the water shortage protection method for the tooth washing device is characterized by comprising the following steps:
the method comprises the following steps: waiting for the motor to work stably;
step two: intermittently acquiring the AD value V1 of the sampling resistor R3 in the output;
step three: detecting a maximum value V1max and a minimum value V1min of V1 in one detection period, and taking V1max-V1min as a variable quantity V2 of V1;
step four: if V1 is less than the set value and V2 is less than the set value, shutting down the machine in case of water shortage; if V1 is larger than the set value, or V2 is larger than the set value, the machine operates normally, and the machine continues to operate in the second step, and the circuit is protected.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects: the water shortage protection circuit of the tooth washing device judges the internal state of the water tank according to the voltage change of one side of the voltage sampling resistor, the motor has different working voltages and currents when the water tank works in a water state and a water-free state, the voltage value of one side of the sampling resistor changes obviously at the moment, and therefore the voltage sampling value obtained by sampling of the voltage detection circuit can be used as the basis for judgment. In the using process, if the water in the water tank is used up, the motor in the tooth washing device is in an idle state, the armature current of the motor is large, and if the tooth washing device is not turned off in time, on one hand, the machine runs for a long time and consumes electric quantity; on the other hand, the large idle current can heat the internal components of the tooth washing device, and reduce the service life of the motor. In addition, most of the hand-held tooth cleaners sold on the market at present have no water shortage protection function, and need to be shut down manually to cut off the power supply and the motor, or adopt a special sensor or device to detect water shortage, so that the hardware burden is increased inevitably. Therefore, a circuit and a method which can automatically shut down or cut off the power supply of the motor in the absence of water are urgently needed, and the tooth cleaner can be timely shut down and protected in the absence of water.
Drawings
FIG. 1 is a block diagram of the water shortage protection circuit and method of the present invention;
FIG. 2 is a schematic circuit diagram of a water shortage protection circuit and method for a dental prophylaxis device according to the present invention;
FIG. 3 is a schematic circuit diagram of the water shortage protection circuit and method of the embodiment 1 of the present invention;
FIG. 4 is a schematic circuit diagram of the water shortage protection circuit and method of the embodiment 2 of the present invention;
Detailed Description
For a further understanding of the objects, aspects and advantages of the present invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
As shown in figure 1, the water shortage protection circuit of the tooth washing device comprises a micro-control unit, a complete machine power supply system, a motor driving unit, a voltage detection unit and a voltage comparison unit; the micro control unit uses a Micro Control Unit (MCU) for realizing the complete machine logic function of the hand-held tooth washing device, and is also used as a micro control unit for realizing the water shortage protection circuit and the method function of the tooth washing device; the complete machine power supply system provides energy for the complete machine function; the motor driving unit provides proper working conditions for the motor inside the hand-held tooth washing device; the voltage detection unit is used for acquiring voltage signals at two ends of the battery and transmitting the acquired voltage signals to the voltage comparison unit to be compared with a preset reference voltage; the voltage comparison unit is structurally provided with a voltage comparator, a voltage signal is output to the MCU after the sampled voltage is compared with the preset voltage, and the MCU stops supplying power to the motor according to the voltage signal reasonable interrupt signal and provides a prompt signal for supplying water to the water tank; specifically, the micro control unit mainly controls an enabling end MOTO _ EN in the invention, controls the running state of the motor, and provides a proper preset voltage value for a negative input plate end of a voltage comparator in the voltage comparison unit; the voltage detection unit samples the voltage at one end of the sampling resistor R4 and controls the system by using the sampled voltage; for the realization of the water shortage protection function of the whole machine, the method specifically comprises the following embodiments:
the first embodiment is as follows:
the motor operates at different currents when the motor is fully loaded or unloaded, so that the current flowing through the sampling resistor R3 is different in magnitude, and different voltage drops are generated on the sampling resistor R3. The single chip microcomputer reads the voltage value, and the working state of the motor can be accurately judged. Wherein, fig. 3 is a schematic circuit diagram of a water shortage protection circuit and method of the tooth washing device in embodiment 1 of the invention. As shown in fig. 3: the water shortage protection circuit of the tooth washing device comprises: the device comprises a whole machine power supply voltage VBAT, motor welding points PD1 and PD2, an NMOS tube U6(U1), a Schottky diode D1, a Schottky diode D2, a Schottky diode D3, a Schottky diode D4, a switch S1, a switch S2, a switch S3, a single-chip microcomputer current limiting resistor R1(R1), a grid G, a pull-down resistor R2(R2), a sampling resistor R3(R3), a resistor R4(R4) and a capacitor C1 (C1). The pin 5 of the schottky diode D1, the pin 6 of the schottky diode D2, the pin 7 of the schottky diode D3, and the pin 8 of the schottky diode D4 are connected to the schottky diode D3 and the motor. The 4 feet of the grid G are connected with the singlechip current limiting resistor R1 and the pull-down resistor R2, and the pull-down resistor R2 is grounded. The pin 1 of the switch S1, the pin 2 of the switch S2 and the pin 3 of the switch S3 are connected with the resistor R4 and the sampling resistor R3, and the sampling resistor R3 is grounded.
In a preferred embodiment of the present invention, as shown in fig. 3, the voltage detection unit includes two sets of emitter followers U1A and U1B, an operational amplifier U1C, and resistors R11, R12, R13, R14, R15, and R16, wherein R11 and R12 are used to pull up the base voltage, so that the sampling voltage obtained by the voltage detection unit is within a reasonable interval range (0-3.3V), wherein the emitter follower U1A is connected to one end of the sampling resistor R3, and the emitter follower U2A is connected to the pulled-up base voltage, and then outputs the sampling voltage after processing at one end of the sampling resistor.
In a preferred embodiment of the present invention, as shown in fig. 3, the voltage comparing unit includes a voltage comparator U2A, a forward input terminal of the comparator U2A is connected to the MCU, a forward input terminal voltage of the comparator U2A is a preset voltage value designed according to a product, a reverse input terminal of the comparator U2A is connected to an output terminal of the voltage detecting unit, and an output terminal of the comparator U2A is connected to the MCU, so that the comparator U outputs 0 or 1 according to the relative magnitudes of the forward input terminal voltage and the reverse input terminal voltage, and after the voltage signal is collected by the MCU, the level of the MOTO _ EN voltage is correspondingly controlled.
In a preferred embodiment of the present invention, as shown in fig. 3, the battery voltage VBAT is passed through the motor, NMOS transistor U6, and sampling resistor R3 to ground. The high and low levels of the MOTO _ EN are micro-controlled by the single chip microcomputer, so that the connection and disconnection of the NMOS tube U6 are micro-controlled, and the on and off of the motor are realized; the Schottky diode D3 is a motor electromotive force bleeder circuit, the pull-down resistor R2 provides stable pull-down for the NMOS tube U6, the single chip microcomputer is ensured to be in a closed state, and the G pole of the NMOS is in a pull-down closed state, so that the stability of the NMOS is ensured; when the motor works normally, the current flows to the ground through the sampling resistor R3, and voltage is generated on the sampling resistor R3 and is supplied to the singlechip to read the voltage value; and the resistor R4 and the capacitor C1 form an RC filter circuit to provide a stable voltage value for the AD pin of the singlechip.
Referring to fig. 3, the water shortage protection circuit of the water toothpick works as follows:
the MCU enables the MOTO _ EN by high voltage, the motor works normally, the handheld tooth washing device works in a water state at the moment, the armature current is small, the voltage of a sampling point is high, the voltage of the positive input end of the comparison unit is larger than the preset voltage of the negative input end, and the voltage comparison unit enables the MCU to control the MOTO _ EN of the enabling end of the motor to enable the motor to work normally; along with the use of the tooth washing device, when the water quantity of the water tank in the tooth washing device is consumed, the motor is in an idle state, the sampling voltage of the voltage detection unit is reduced, then the voltage of the positive input end of the voltage comparison unit is rapidly reduced, the change rate of the sampling voltage of the voltage detection unit is increased to be larger than a set value, at the moment, the voltage of the positive input end of the comparator U2A is smaller than the voltage of the negative input end, therefore, the voltage comparison unit gives a low potential voltage signal to the MCU, the MCU is enabled to reduce the voltage of the enable end MOTO _ EN, the NOMS tube is closed along with the.
Example two:
the motor operates at different currents when the motor is fully loaded or unloaded, so that the current flowing through the sampling resistor R3 is different in magnitude, and different voltage drops are generated on the sampling resistor R3. The single chip microcomputer reads the voltage value, and the working state of the motor can be accurately judged. Wherein, fig. 3 is a schematic circuit diagram of a water shortage protection circuit and method of the tooth washing device in embodiment 1 of the invention. As shown in fig. 1: the water shortage protection circuit of the tooth washing device comprises: the device comprises a whole machine power supply voltage VBAT, motor welding points PD1 and PD2, an NMOS tube U6(U1), a Schottky diode D1, a Schottky diode D2, a Schottky diode D3, a Schottky diode D4, a switch S1, a switch S2, a switch S3, a single-chip microcomputer current limiting resistor R1(R1), a grid G, a pull-down resistor R2(R2), a sampling resistor R3(R3), a resistor R4(R4) and a capacitor C1 (C1). The pin 5 of the schottky diode D1, the pin 6 of the schottky diode D2, the pin 7 of the schottky diode D3, and the pin 8 of the schottky diode D4 are connected to the schottky diode D3 and the motor. The 4 feet of the grid G are connected with the singlechip current limiting resistor R1 and the pull-down resistor R2, and the pull-down resistor R2 is grounded. The pin 1 of the switch S1, the pin 2 of the switch S2 and the pin 3 of the switch S3 are connected with the resistor R4 and the sampling resistor R3, and the sampling resistor R3 is grounded.
In a preferred embodiment of the present invention, as shown in fig. 4, the voltage detection unit includes two sets of emitter followers U1A and U1B, an operational amplifier U1C, and resistors R11, R12, R13, R14, R15, and R16, wherein R11 and R12 are used to pull up the base voltage, so that the sampling voltage obtained by the voltage detection unit is within a reasonable interval range (0-3.3V), wherein the emitter follower U1A is connected to one end of the sampling resistor R3, and the emitter follower U2A is connected to the pulled-up base voltage, and then outputs the sampling voltage after processing at one end of the sampling resistor.
In a preferred embodiment of the present invention, a subtraction circuit is required to be connected between the voltage detection unit and the voltage comparison unit, a forward input end of the subtraction circuit is connected to an output end of the sampling circuit, a reverse input end of the subtraction circuit is connected to the MCU, a voltage value of the subtraction circuit is a sampling voltage of a sampling point when the motor normally operates, and an output end of the subtraction circuit is connected to the voltage comparison unit.
In a preferred embodiment of the present invention, the voltage comparing unit includes a voltage comparator U2A, a forward input terminal of the comparator U2A is connected to the MCU, a forward input terminal voltage of the comparator U2 is an output voltage of the subtracting circuit, a reverse input terminal voltage of the comparator U2 is a preset voltage value designed according to a product, an output terminal of the comparator U2A is connected to the MCU, and the comparator U outputs 0 or 1 according to a relative magnitude of the forward input terminal voltage and the reverse input terminal voltage, and after the voltage signal is collected by the MCU, the level of the MOTO _ EN voltage is correspondingly controlled.
In a preferred embodiment of the present invention, the battery voltage VBAT is passed through the motor, NMOS transistor U6, and sampling resistor R3 to ground. The high and low levels of the MOTO _ EN are micro-controlled by the single chip microcomputer, so that the connection and disconnection of the NMOS tube U6 are micro-controlled, and the on and off of the motor are realized; the Schottky diode D3 is a motor electromotive force bleeder circuit, the pull-down resistor R2 provides stable pull-down for the NMOS tube U6, the single chip microcomputer is ensured to be in a closed state, and the G pole of the NMOS is in a pull-down closed state, so that the stability of the NMOS is ensured; when the motor works normally, the current flows to the ground through the sampling resistor R3, and voltage is generated on the sampling resistor R3 and is supplied to the singlechip to read the voltage value; and the resistor R4 and the capacitor C1 form an RC filter circuit to provide a stable voltage value for the AD pin of the singlechip.
Referring to fig. 4, the water shortage protection circuit of the water toothpick works as follows:
the MCU enables the MOTO _ EN by high voltage, the motor works normally, the handheld tooth washing device works in a water state at the moment, the armature current is small, the voltage of a sampling point is high and is close to the preset value of one end of the subtraction circuit, the output of the subtraction circuit is close to 0 at the moment, the voltage of the positive input end of the comparison unit is smaller than the preset voltage of the negative input end, and the voltage comparison unit enables the MCU to control the MOTO _ EN of the motor enabling end to enable the motor to work normally; along with the use of the tooth washing device, when the water quantity of the water tank in the tooth washing device is consumed, the motor is in an idle state, the sampling voltage of the voltage detection unit is reduced, the change rate of the sampling voltage is larger than a set value, meanwhile, the difference between the sampling voltage and the preset value at one end of the subtraction operation circuit is larger, the voltage of the positive input end of the voltage comparison unit is increased rapidly along with the increase of the voltage of the positive input end of the voltage comparison unit, at the moment, the voltage of the positive input end of the comparator U2A is larger than the preset voltage of the negative input end, therefore, the voltage comparison unit provides a low potential voltage signal for the MCU, the MCU reduces.
The foregoing is considered as the preferred embodiment of the invention and is not to be construed as limiting the invention in any way. Various equivalent changes and modifications can be made by those skilled in the art based on the above embodiments, and all equivalent changes and modifications within the scope of the claims should fall within the protection scope of the present invention.
Claims (10)
1. A water shortage protection circuit and method for a tooth washing device are characterized in that the water shortage protection circuit for the tooth washing device comprises:
the Micro Control Unit (MCU) is used for realizing the complete machine logic function of the hand-held tooth washing device and is also used as a micro control unit for realizing the water shortage protection circuit and the method function of the tooth washing device;
the whole machine power supply system supplies power to the tooth washing device by using a lithium battery;
the motor driving circuit provides proper working conditions for the motor in the hand-held tooth washing device;
the voltage detection unit is used for acquiring voltage signals at two ends of the motor and transmitting the acquired voltage signals to the voltage comparison unit to be compared with a preset reference voltage;
and the voltage comparison unit is structurally a voltage comparator, compares the sampled voltage with a preset voltage and then outputs a voltage signal to the MCU, and the MCU stops supplying power to the motor and gives a prompt signal that the water tank needs to be supplemented with water according to interruption generated by the voltage signal.
2. The water shortage protection circuit and method for a water toothpick according to claim 1, wherein the water shortage protection circuit for a water toothpick comprises: the device comprises a whole machine power supply voltage VBAT, motor welding points PD1 and PD2, an NMOS tube U6(U1), a Schottky diode D1, a Schottky diode D2, a Schottky diode D3, a Schottky diode D4, a switch S1, a switch S2, a switch S3, a singlechip current limiting resistor R1, a grid G, a pull-down resistor R2, a sampling resistor R3, a resistor R4 and a capacitor C1. The pin 5 of the schottky diode D1, the pin 6 of the schottky diode D2, the pin 7 of the schottky diode D3, and the pin 8 of the schottky diode D4 are connected to the schottky diode D3 and the motor. The 4 feet of the grid G are connected with the singlechip current limiting resistor R1 and the pull-down resistor R2, and the pull-down resistor R2 is grounded. The pin 1 of the switch S1, the pin 2 of the switch S2 and the pin 3 of the switch S3 are connected with the resistor R4 and the sampling resistor R3, the sampling resistor R3 is grounded, and the circuit also comprises a voltage detection unit and a voltage comparison unit.
3. The water shortage protection circuit and method for tooth washing device as claimed in claims 1-2, wherein the voltage detection unit comprises two sets of emitter followers U1A and U1B, an operational amplifier U1C, and resistors R11, R12, R13, R14, R15, R16, wherein R11 and R12 are used to pull up the base voltage, so that the sampling voltage obtained by the voltage detection unit is within a reasonable range (0-3.3V), wherein the emitter follower U1A is connected to one end of the sampling resistor R3, the emitter follower U2A is connected to the pulled up base voltage, and the output is the sampling voltage processed at one end of the sampling resistor.
4. The water shortage protection circuit and method for the tooth washing device as claimed in claims 1-2, wherein the voltage comparison unit comprises a voltage comparator U2A, the forward input terminal of the comparator U2A is connected to the MCU, the forward input terminal voltage is a preset voltage value designed according to the product, the reverse input terminal of the comparator U2A is connected to the output terminal of the voltage detection unit, the output terminal of the comparator U2A is connected to the MCU, it will output 0 or 1 according to the relative magnitude of the forward input terminal voltage and the reverse input terminal voltage, and after the voltage signal is collected by the MCU, the MOTO _ EN voltage is micro-controlled accordingly.
5. The circuit and method for protecting a water shortage of a water toothpick according to claims 1-2 wherein the battery voltage VBAT is passed through the motor, NMOS tube U6, and sampling resistor R3 to ground. The high and low levels of the MOTO _ EN are controlled by the single chip microcomputer in a micro mode, so that the connection and disconnection of the NMOS tube U6 are controlled in a micro mode, and the on and off of the motor are achieved.
6. The water shortage protection circuit and method for the tooth washing device as claimed in claims 1-2, wherein the Schottky diode D3 is a motor electromotive force release loop, the pull-down resistor R2 provides a stable pull-down for the NMOS tube U6, so as to ensure the single chip is in the off state, and the G pole of the NMOS is in the pull-down off state, so as to ensure the stability of the NMOS.
7. The water shortage protection circuit and method for the tooth washing device as claimed in claims 1-2, wherein the current passes through the sampling resistor R3 to ground during the normal operation of the motor, and the voltage generated by the sampling resistor R3 is used by the single chip to read the voltage value.
8. The water shortage protection circuit and method for the water toothpick according to claims 1-2, wherein the resistor R4 and the capacitor C1 form an RC filter circuit to provide a stable voltage value for the AD pin of the single chip microcomputer.
9. The water shortage protection method for the tooth washing device according to the claims 1-8, characterized by comprising the following steps:
the method comprises the following steps: collecting a primary battery voltage value V1 before the motor works;
step two: waiting for the motor to work stably;
step three: intermittently collecting the battery voltage V2 in the output;
step four: detecting a maximum value V2max and a minimum value V2min of V2 in one detection period, and taking V2max-V2min as a variable quantity V3 of V2;
step five: if V1-V2 is smaller than the set value and V3 is smaller than the set value, shutting down the machine in case of water shortage; if V1-V2 is larger than the set value, or V3 is larger than the set value, the machine normally operates, the third step of operation is continued, and the operation is repeated in a circulating mode to protect the circuit.
10. The water shortage protection method for the tooth washing device according to the claims 1-8, characterized by comprising the following steps:
the method comprises the following steps: waiting for the motor to work stably;
step two: intermittently acquiring the AD value V1 of the sampling resistor R3 in the output;
step three: detecting a maximum value V1max and a minimum value V1min of V1 in one detection period, and taking V1max-V1min as a variable quantity V2 of V1;
step four: if V1 is less than the set value and V2 is less than the set value, shutting down the machine in case of water shortage; if V1 is larger than the set value, or V2 is larger than the set value, the machine operates normally, and the machine continues to operate in the second step, and the circuit is protected.
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| CN202110209479.XA CN113013840A (en) | 2021-02-24 | 2021-02-24 | Water shortage protection circuit and method for tooth washing device |
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| CN202110209479.XA CN113013840A (en) | 2021-02-24 | 2021-02-24 | Water shortage protection circuit and method for tooth washing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114776568A (en) * | 2022-04-14 | 2022-07-22 | 深圳市杉川机器人有限公司 | Water shortage protection device and method for water pump |
| CN116742581A (en) * | 2023-08-14 | 2023-09-12 | 江苏东成工具科技有限公司 | Water-free protection method of intelligent equipment and intelligent equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180337624A1 (en) * | 2017-05-22 | 2018-11-22 | Mitsubishi Electric Corporation | Motor control apparatus |
| CN109965997A (en) * | 2019-03-29 | 2019-07-05 | 上海智觅智能科技有限公司 | A kind of intelligent function and its detection algorithm of tooth flusher |
| CN210727916U (en) * | 2019-07-24 | 2020-06-12 | 广东罗曼智能科技股份有限公司 | Intelligent shutdown tooth flushing device |
| CN211786693U (en) * | 2020-04-28 | 2020-10-27 | 广州皓醒湾科技有限公司 | Current control system and tooth rinsing device |
| CN112104302A (en) * | 2020-08-05 | 2020-12-18 | 江苏超力电器有限公司 | Brush DC motor locked rotor detection and protection device |
-
2021
- 2021-02-24 CN CN202110209479.XA patent/CN113013840A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180337624A1 (en) * | 2017-05-22 | 2018-11-22 | Mitsubishi Electric Corporation | Motor control apparatus |
| CN109965997A (en) * | 2019-03-29 | 2019-07-05 | 上海智觅智能科技有限公司 | A kind of intelligent function and its detection algorithm of tooth flusher |
| CN210727916U (en) * | 2019-07-24 | 2020-06-12 | 广东罗曼智能科技股份有限公司 | Intelligent shutdown tooth flushing device |
| CN211786693U (en) * | 2020-04-28 | 2020-10-27 | 广州皓醒湾科技有限公司 | Current control system and tooth rinsing device |
| CN112104302A (en) * | 2020-08-05 | 2020-12-18 | 江苏超力电器有限公司 | Brush DC motor locked rotor detection and protection device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114776568A (en) * | 2022-04-14 | 2022-07-22 | 深圳市杉川机器人有限公司 | Water shortage protection device and method for water pump |
| CN116742581A (en) * | 2023-08-14 | 2023-09-12 | 江苏东成工具科技有限公司 | Water-free protection method of intelligent equipment and intelligent equipment |
| CN116742581B (en) * | 2023-08-14 | 2023-10-27 | 江苏东成工具科技有限公司 | Water-free protection method of intelligent equipment and intelligent equipment |
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Application publication date: 20210622 |