External motor control circuit of shimmy type electric toothbrush

Abstract

The utility model discloses an external motor control circuit of a shimmy type electric toothbrush, and belongs to the technical field of motor control circuits. Wherein the external motor control circuit is composed of a first motor control circuit and a second motor control circuit, the first motor control circuit and the second motor control circuit are both connected with an internal circuit of the electric toothbrush, and the internal circuit comprises a motor vibration and swing control circuit; wherein the first motor control circuit comprises a first shimmy circuit and a first driving circuit, and the first shimmy circuit is electrically connected with the first driving circuit; the second motor control circuit comprises a second shimmy circuit and a second drive circuit, and the second shimmy circuit is electrically connected with the second drive circuit. According to the utility model, the stability of the electric toothbrush system is enhanced, the monitoring protection is enhanced, the manufacturing cost is relatively low, the manufacturing cost of a product can be reduced, and the speed and the steering are easy to control.

Description

Technical Field

[0001] The utility model relates to the technical field of motor control circuits, in particular to an external motor control circuit of an oscillating electric toothbrush. Background Art

[0002] In recent years, with the continuous development of electric toothbrush technology, people's awareness and demand for oral health care have also been continuously improved. Traditional manual toothbrushes can only rely on the user's hand movements for cleaning, while electric toothbrushes make oral cleaning more intelligent and efficient through built-in motor control and sensor technology, and are equipped with a variety of cleaning modes, such as deep cleaning mode, sensitive mode, massage mode, etc. Users can choose the appropriate mode according to their oral conditions and needs. For example: the sensitive mode is suitable for people with sensitive teeth, and the massage mode helps stimulate blood circulation in the gums. More advanced electric toothbrushes are also equipped with smart sensors and connection functions, which can monitor the user's brushing habits and skills in real time by connecting to mobile phones or other smart devices. Based on these data, it provides users with brushing suggestions to help users improve their brushing methods. With the continuous innovation and development of electric toothbrush technology, oral health care has become more intelligent, personalized and efficient.

[0003] The oscillating electric toothbrushes on the market currently have good cleaning performance, but the vibration is very strong and the noise is loud. They can effectively remove plaque, but they are more abrasive to teeth and can easily cause gum bleeding. In addition, they use Hall sensors as the sensing position of angle rotation, and can only calculate the angle position through software algorithms, so it is difficult to change the subtle angle range of the toothbrush. Utility Model Content

[0004] The purpose of the utility model is to provide an external motor control circuit of an oscillating electric toothbrush to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] An external motor control circuit of an oscillating electric toothbrush, wherein the external motor control circuit consists of a first motor control circuit and a second motor control circuit, and the first motor control circuit and the second motor control circuit are both connected to the internal circuit of the electric toothbrush, and the internal circuit includes a motor vibration and swing control circuit; wherein the first motor control circuit includes a first oscillating circuit and a first drive circuit, and the first oscillating circuit and the first drive circuit are electrically connected; and the second motor control circuit includes a second oscillating circuit and a second drive circuit, and the second oscillating circuit and the second drive circuit are electrically connected.

[0007] Furthermore, the first oscillation circuit includes a diode D1, a capacitor C1 and a chip U1, and the chip U1 model is HTB2101S_SOP8;

[0008] Wherein, the first terminal of the chip U1 is connected to the VBAT terminal;

[0009] The second end of the chip U1 is connected to the PWM_P end of the motor vibration and swing control circuit;

[0010] The third terminal of the chip U1 is connected to the PWM_N terminal of the motor vibration and swing control circuit;

[0011] The fourth terminal of the chip U1 is grounded;

[0012] The fifth terminal of chip U1 is LO1 terminal;

[0013] The sixth terminal of the chip U1 is the VS1 terminal, which is connected to the second terminal of the capacitor C1;

[0014] The seventh terminal of the chip U1 is the HO1 terminal;

[0015] The eighth terminal of the chip U1 is connected to the second terminal of the diode D1 and the first terminal of the capacitor C1;

[0016] A first terminal of the diode D1 is connected to the VBAT terminal.

[0017] Further, the first oscillation circuit and the first driving circuit are connected via the LO1 terminal, the VS1 terminal and the HO1 terminal, and the first driving circuit includes a resistor R1, a transistor Q1, a resistor R2, a resistor R3, a transistor Q2, a resistor R5, a resistor R4 and a capacitor C3;

[0018] The first end of the resistor R1 is the HO1 end, which is connected to the seventh end of the chip U1 of the first oscillation circuit;

[0019] The second end of the resistor R1 is connected to the second end of the transistor Q1 and the first end of the resistor R2;

[0020] A first terminal of the transistor Q1 is connected to the VBAT terminal;

[0021] The third end of the transistor Q1 is the VS1 end, connected to the second end of the resistor R2, the first end of the transistor Q2 and the first end of the resistor R5, and connected to the sixth end of the chip U1 of the first oscillation circuit, and connected to the internal circuit of the electric toothbrush;

[0022] The second end of the transistor Q2 is connected to the second end of the resistor R3 and the first end of the resistor R4;

[0023] The first end of the resistor R3 is the LO1 end, connected to the fifth end of the chip U1 of the first oscillation circuit;

[0024] The second end of the resistor R4 is connected to the third end of the transistor Q2, and both are grounded;

[0025] The second end of the resistor R5 is connected to the first end of the capacitor C3;

[0026] A second terminal of the capacitor C3 is grounded.

[0027] Furthermore, if a low voltage is used to drive the external motor control circuit, the first oscillation circuit in the first motor control circuit is removed, and the chip U1 of the first oscillation circuit is omitted to reduce the manufacturing cost of the product;

[0028] Wherein, the first end of the resistor R1 is connected to the PWM_P end of the motor vibration and swing control circuit;

[0029] A first end of the resistor R3 is connected to the PWM_N end of the motor vibration and swing control circuit.

[0030] Furthermore, the second oscillating circuit includes a diode D2, a capacitor C2 and a chip U2, and the chip U2 model is HTB2101S_SOP8;

[0031] Wherein, the first terminal of the chip U2 is connected to the VBAT terminal;

[0032] The second end of the chip U2 is connected to the PWM_N end of the motor vibration and swing control circuit;

[0033] The third terminal of the chip U2 is connected to the PWM_P terminal of the motor vibration and swing control circuit;

[0034] The fourth terminal of the chip U2 is grounded;

[0035] The fifth terminal of chip U2 is LO2 terminal;

[0036] The sixth terminal of the chip U2 is the VS2 terminal, which is connected to the second terminal of the capacitor C2;

[0037] The seventh terminal of the chip U2 is the HO2 terminal;

[0038] The eighth terminal of the chip U2 is connected to the second terminal of the diode D2 and the first terminal of the capacitor C2;

[0039] A first terminal of the diode D2 is connected to the VBAT terminal.

[0040] Further, the second oscillation circuit and the second driving circuit are connected via the LO2 terminal, the VS2 terminal and the HO2 terminal, and the second driving circuit includes a transistor Q3, a resistor R6, a resistor R7, a resistor R8, a transistor Q4, a resistor R9, a capacitor C4 and a resistor R10;

[0041] Wherein, the first terminal of the transistor Q3 is connected to the VBAT terminal;

[0042] The second end of the transistor Q3 is connected to the first end of the resistor R6 and the first end of the resistor R7;

[0043] The second end of the resistor R6 is the HO2 end, which is connected to the seventh end of the chip U2 of the second oscillating circuit;

[0044] The second end of the resistor R7 is the VS2 end, connected to the third end of the transistor Q3, the first end of the transistor Q4 and the first end of the resistor R8, and connected to the sixth end of the chip U2 of the second oscillation circuit, and connected to the internal circuit of the electric toothbrush;

[0045] The second end of the transistor Q4 is connected to the first end of the resistor R9 and the first end of the resistor R10;

[0046] The second end of the resistor R9 is the LO2 end, which is connected to the fifth end of the chip U2 of the second oscillation circuit;

[0047] The second end of the resistor R10 is connected to the third end of the transistor Q4, and both are grounded;

[0048] The second end of the resistor R8 is connected to the first end of the capacitor C4;

[0049] A second terminal of the capacitor C4 is grounded.

[0050] Furthermore, if a low voltage is used to drive the external motor control circuit, the second oscillation circuit in the second motor control circuit is removed, and the chip U2 of the second oscillation circuit is omitted to reduce the manufacturing cost of the product;

[0051] Wherein, the second end of the resistor R6 is connected to the PWM_N end of the motor vibration and swing control circuit;

[0052] The second end of the resistor R9 is connected to the PWM_P end of the motor vibration and swing control circuit.

[0053] Compared with the prior art, the beneficial effects achieved by the utility model are as follows: the utility model discloses an external motor control circuit of an oscillating electric toothbrush, wherein the external motor control circuit is composed of a first motor control circuit and a second motor control circuit, and the first motor control circuit and the second motor control circuit are both connected to the internal circuit of the electric toothbrush, and the internal circuit includes a motor vibration and swing control circuit; wherein the first motor control circuit includes a first oscillating circuit and a first driving circuit, and the first oscillating circuit and the first driving circuit are electrically connected; the second motor control circuit includes a second oscillating circuit and a second driving circuit, and the second oscillating circuit and the second driving circuit are electrically connected. The utility model enhances the stability of the electric toothbrush system, enhances monitoring protection, has relatively low manufacturing cost, can reduce the manufacturing cost of the product, and is easy to control the speed and steering, so that the brush head oscillation adjustment is more flexible and accurate, and reduces the problems of excessive vibration and high noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0055] Figure 1 The utility model is a schematic diagram of the structure of an external motor control circuit of an oscillating electric toothbrush.

[0056] Figure 2 The utility model is a structural schematic diagram of a low-voltage drive external motor control circuit of an oscillating electric toothbrush. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0058] See also Figure 1-Figure 2 The utility model provides a technical solution: an external motor control circuit of an oscillating electric toothbrush, and a structural schematic diagram of an external motor control circuit of an oscillating electric toothbrush corresponding to the circuit is shown in FIG. Figure 1 shown.

[0059] The external motor control circuit of the utility model is composed of a first motor control circuit and a second motor control circuit, and the first motor control circuit and the second motor control circuit are both connected to the internal circuit of the electric toothbrush, and the internal circuit includes a motor vibration and swing control circuit; as shown in the attached Figure 1 As shown, the first motor control circuit includes a first oscillation circuit and a first drive circuit, and the first oscillation circuit and the first drive circuit are electrically connected; the second motor control circuit includes a second oscillation circuit and a second drive circuit, and the second oscillation circuit and the second drive circuit are electrically connected.

[0060] Please see attached Figure 1 The first oscillation circuit includes a diode D1, a capacitor C1 and a chip U1, wherein the diode D1 model is 1N4148, the capacity of the capacitor C1 is 10uF, and the chip U1 is an 8-pin chip, model HTB2101S_SOP8; the first driving circuit includes a resistor R1, a transistor Q1, a resistor R2, a resistor R3, a transistor Q2, a resistor R5, a resistor R4 and a capacitor C3, wherein the resistance of the resistor R1 is 33Ω, the transistor Q1 is an NMOS transistor, the resistance of the resistor R2 is 100kΩ, the resistance of the resistor R3 is 33Ω, the transistor Q2 is an NMOS transistor, the resistance of the resistor R5 is 33Ω, the resistance of the resistor R4 is 100kΩ, and the capacity of the capacitor C3 is 1uF. The second oscillation circuit includes a diode D2, a capacitor C2 and a chip U2, wherein the diode D2 model is 1N4148, the capacity of the capacitor C2 is 10uF, and the chip U2 is an 8-pin chip, model HTB2101S_SOP8; the second driving circuit includes a transistor Q3, a resistor R6, a resistor R7, a resistor R8, a transistor Q4, a resistor R9, a capacitor C4 and a resistor R10, wherein the transistor Q3 is an NMOS transistor, the resistance of the resistor R6 is 33Ω, the resistance of the resistor R7 is 100kΩ, the resistance of the resistor R8 is 33Ω, the transistor Q4 is an NMOS transistor, the resistance of the resistor R9 is 33Ω, the capacity of the capacitor R4 is 1uF, and the resistance of the resistor R10 is 100kΩ.

[0061] Among them, the driving mode of chip U1 is 2N, so diode D1 and capacitor C1 are required, but if the driving mode of chip U1 is 1N1P, diode D1 and capacitor C1 are not required; the driving mode of chip U2 is 2N, so diode D2 and capacitor C2 are required, but if the driving mode of chip U2 is 1N1P, diode D2 and capacitor C2 are not required.

[0062] It should be noted that if a low voltage is used to drive the external motor control circuit, as shown in the attached Figure 2 As shown, the first oscillation circuit in the first motor control circuit is removed, that is, there is only the first drive circuit in the first motor control circuit, and the second oscillation circuit in the second motor control circuit is removed, that is, there is only the second drive circuit in the second motor control circuit. The purpose of this is to reduce the manufacturing cost of the product.

[0063] The utility model uses a brushed DC motor to complete it, which has an absolute advantage in cost, and the manufacturing cost is relatively low, which can reduce the manufacturing cost of the product. The direction of rotation of the brushed DC motor is achieved by changing the wiring method between the armatures. By changing the polarity of the power supply, the rotation direction of the motor can be quickly changed to achieve vibration and swing functions, and the starting performance is good and the response speed is fast. There are two mode functions, one is the motor vibration mode, and the other is the motor swing mode: the motor vibration mode function can operate independently and can become a vibrating electric toothbrush; and the motor swing mode is an alternating operation of swing and vibration, achieving the integrated operation of swing and vibration. The utility model adopts a single set of PWM_P and PWM_N dead zone complementary output method, which can make the vibration of the motor rotor more stable and reliable, among which PWM_P and PWM_N are two complementary pulse signals.

[0064] The working principle of the utility model is:

[0065] When the output is in the motor vibration mode, the PWM_N and PWM_P output modes output signals in the PWM cycle (the PWM cycle is the sum of the time occupied by PWM_N and PWM_P), and PWM_N and PWM_P use the same duty cycle and dead zone complementary output mode (wherein, the duty cycle of PWM_N is the ratio of the time occupied by PWM_N to the PWM cycle, and the duty cycle of PWM_P is the ratio of the time occupied by PWM_P to the PWM cycle, and PWM_N and PWM_P use the same duty cycle, which means that the time occupied by PWM_N is equal to the time occupied by PWM_P, that is, the time occupied by PWM_N and PWM_P both occupy 50% of the PWM cycle). At this time, the motor rotor will reciprocate left and right in a PWM cycle and drive the brush head to vibrate back and forth, and the frequency of vibration is determined by the PWM cycle time. By adjusting the PWM cycle time, the vibration frequency of the brush head can be controlled. Increasing the PWM cycle time can reduce the vibration frequency, and vice versa. In addition, the vibration amplitude of the brush head is also controlled by adjusting the PWM cycle time. The longer the PWM cycle time is changed, the greater the amplitude of vibration, and vice versa.

[0066] When the output is in the motor oscillation mode, the PWM_N and PWM_P output modes output signals in the PWM cycle, and the PWM_N and PWM_P output modes have slightly different duty cycles (PWM_N and PWM_P have slightly different duty cycles, which means that the time occupied by PWM_N is not equal to the time occupied by PWM_P). When the PWM_N duty cycle is greater than the PWM_P duty cycle, the rotor oscillation will be offset in the forward direction, and the offset of the rotor oscillation is the difference between the PWM_N duty cycle and the PWM_P duty cycle. The smaller the difference between the PWM_N duty cycle and the PWM_P duty cycle, the smaller the offset. By accumulating a small offset, the rotor oscillation will gradually swing in the forward direction, and vice versa. When the PWM_N duty cycle is less than the PWM_P duty cycle, the rotor oscillation will be offset in the reverse direction. The offset of the rotor oscillation is the difference between the PWM_N duty cycle and the PWM_P duty cycle. By accumulating a small offset, the rotor oscillation will gradually swing in the reverse direction. In this way, the direction and amplitude of the rotor swing can be controlled through the PWM_N and PWM_P output methods, and the time frequency of the rotor swing is related to the difference between the duty cycle of PWM_N and the duty cycle of PWM_P.

[0067] The advantage of the utility model in controlling the brushed DC motor by PWM_N and PWM_P output is that it has precise control. The direction and amplitude of the rotor swing can be precisely controlled by a small difference in duty cycle, making the brush head swing adjustment more flexible and precise. By accumulating small offsets, the swing amplitude of the rotor can be gradually adjusted, and the swing direction can be flexibly controlled, which improves the adjustability and applicability of the system. The brushed DC motor drive design of the embodiment is much simpler than the brushless motor, and the system detection and control method can also be omitted.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0069] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An external motor control circuit for an oscillating electric toothbrush, characterized in that: The external motor control circuit is composed of a first motor control circuit and a second motor control circuit, and the first motor control circuit and the second motor control circuit are both connected to the internal circuit of the electric toothbrush, and the internal circuit includes a motor vibration and swing control circuit; Among them, the first motor control circuit includes a first oscillation circuit and a first drive circuit, and the first oscillation circuit and the first drive circuit are electrically connected; the second motor control circuit includes a second oscillation circuit and a second drive circuit, and the second oscillation circuit and the second drive circuit are electrically connected.

2. The external motor control circuit of an oscillating electric toothbrush according to claim 1, characterized in that: The first oscillating circuit includes a diode D1, a capacitor C1 and a chip U1; Wherein, the first end of the chip U1 is connected to the VBAT end; The second end of the chip U1 is connected to the PWM_P end of the motor vibration and swing control circuit; The third terminal of the chip U1 is connected to the PWM_N terminal of the motor vibration and swing control circuit; The fourth terminal of the chip U1 is grounded; The fifth terminal of the chip U1 is the LO1 terminal; The sixth terminal of the chip U1 is the VS1 terminal, which is connected to the second terminal of the capacitor C1; The seventh terminal of the chip U1 is the HO1 terminal; The eighth terminal of the chip U1 is connected to the second terminal of the diode D1 and the first terminal of the capacitor C1; The first end of the diode D1 is connected to the VBAT end.

3. The external motor control circuit of an oscillating electric toothbrush according to claim 2, characterized in that: The first oscillation circuit and the first driving circuit are connected via the LO1 terminal, the VS1 terminal and the HO1 terminal, and the first driving circuit includes a resistor R1, a transistor Q1, a resistor R2, a resistor R3, a transistor Q2, a resistor R5, a resistor R4 and a capacitor C3; The first end of the resistor R1 is the HO1 end, which is connected to the seventh end of the chip U1 of the first oscillation circuit; The second end of the resistor R1 is connected to the second end of the transistor Q1 and the first end of the resistor R2; The first terminal of the transistor Q1 is connected to the VBAT terminal; The third end of the transistor Q1 is the VS1 end, connected to the second end of the resistor R2, the first end of the transistor Q2 and the first end of the resistor R5, and connected to the sixth end of the chip U1 of the first oscillation circuit, and connected to the internal circuit of the electric toothbrush; The second end of the transistor Q2 is connected to the second end of the resistor R3 and the first end of the resistor R4; The first end of the resistor R3 is the LO1 end, which is connected to the fifth end of the chip U1 of the first oscillation circuit; The second end of the resistor R4 is connected to the third end of the transistor Q2, and both are grounded; The second end of the resistor R5 is connected to the first end of the capacitor C3; The second terminal of the capacitor C3 is grounded.

4. The external motor control circuit of an oscillating electric toothbrush according to claim 3, characterized in that: If the external motor control circuit is driven by low voltage, the first oscillation circuit in the first motor control circuit is removed; Wherein, the first end of the resistor R1 is connected to the PWM_P end of the motor vibration and swing control circuit; The first end of the resistor R3 is connected to the PWM_N end of the motor vibration and swing control circuit.

5. The external motor control circuit of an oscillating electric toothbrush according to claim 1, characterized in that: The second oscillating circuit includes a diode D2, a capacitor C2 and a chip U2; Wherein, the first end of the chip U2 is connected to the VBAT end; The second end of the chip U2 is connected to the PWM_N end of the motor vibration and swing control circuit; The third terminal of the chip U2 is connected to the PWM_P terminal of the motor vibration and swing control circuit; The fourth terminal of the chip U2 is grounded; The fifth terminal of the chip U2 is the LO2 terminal; The sixth terminal of the chip U2 is the VS2 terminal, which is connected to the second terminal of the capacitor C2; The seventh terminal of the chip U2 is the HO2 terminal; The eighth terminal of the chip U2 is connected to the second terminal of the diode D2 and the first terminal of the capacitor C2; The first end of the diode D2 is connected to the VBAT end.

6. The external motor control circuit of an oscillating electric toothbrush according to claim 5, characterized in that: The second oscillation circuit and the second driving circuit are connected via the LO2 terminal, the VS2 terminal and the HO2 terminal, and the second driving circuit includes a transistor Q3, a resistor R6, a resistor R7, a resistor R8, a transistor Q4, a resistor R9, a capacitor C4 and a resistor R10; Wherein, the first end of the transistor Q3 is connected to the VBAT end; The second end of the transistor Q3 is connected to the first end of the resistor R6 and the first end of the resistor R7; The second end of the resistor R6 is the HO2 end, which is connected to the seventh end of the chip U2 of the second oscillating circuit; The second end of the resistor R7 is the VS2 end, connected to the third end of the transistor Q3, the first end of the transistor Q4 and the first end of the resistor R8, and connected to the sixth end of the chip U2 of the second oscillation circuit, and connected to the internal circuit of the electric toothbrush; The second end of the transistor Q4 is connected to the first end of the resistor R9 and the first end of the resistor R10; The second end of the resistor R9 is the LO2 end, which is connected to the fifth end of the chip U2 of the second oscillation circuit; The second end of the resistor R10 is connected to the third end of the transistor Q4, and both are grounded; The second end of the resistor R8 is connected to the first end of the capacitor C4; The second terminal of the capacitor C4 is grounded.

7. The external motor control circuit of an oscillating electric toothbrush according to claim 6, characterized in that: If the external motor control circuit is driven by low voltage, the second oscillation circuit in the second motor control circuit is removed; Wherein, the second end of the resistor R6 is connected to the PWM_N end of the motor vibration and swing control circuit; The second end of the resistor R9 is connected to the PWM_P end of the motor vibration and swing control circuit.

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