Brush head type identification circuit, brush head and electric toothbrush

Abstract

The embodiment of the utility model provides a brush head type identification circuit, a brush head and an electric toothbrush. The brush head type identification circuit comprises a voltage division circuit and a switch unit, the first end of the voltage division circuit is used for being connected with the positive electrode of the main control unit, the second end of the voltage division circuit is used for being connected with the negative electrode of the main control unit, and the output end of the voltage division circuit is used for outputting divided voltage for identifying the type of the brush head; the first end of the switch unit is connected with the first end of the voltage division circuit, the second end of the switch unit is connected with the second end of the voltage division circuit, and the third end of the switch unit is connected with an internal power ground; wherein under the condition that the charging duration received by the switch unit reaches the preset charging duration, the second end of the switch unit is conducted with the internal power supply ground.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of daily necessities. More specifically, the embodiments of the present application relate to a brush head type recognition circuit, a brush head, and an electric toothbrush. Background Art

[0002] Currently, in the brush head recognition technology of electric toothbrushes, there is a general tendency to adopt advanced NFC technology. This non-contact radio frequency technology can accurately read the ID number or stored content in the chip, thereby precisely defining the functions of the brush head. However, this technology has a relatively high cost, which poses a certain economic pressure on consumers.

[0003] In view of this, a new technical solution is needed to solve the above technical problems. Utility Model Content

[0004] The purpose of the present application is to provide a new technical solution for a brush head type recognition circuit, a brush head, and an electric toothbrush.

[0005] In a first aspect, the present application provides a brush head type recognition circuit. The brush head type recognition circuit includes: a voltage division circuit and a switch unit;

[0006] The first end of the voltage division circuit is used to connect to the positive pole of the main control unit, the second end of the voltage division circuit is used to connect to the negative pole of the main control unit, and the output end of the voltage division circuit is used to output a voltage division voltage for recognizing the brush head type;

[0007] The first end of the switch unit is connected to the first end of the voltage division circuit, the second end of the switch unit is connected to the second end of the voltage division circuit, and the third end of the switch unit is connected to the internal power ground;

[0008] Wherein, when the charging duration received by the switch unit reaches a preset charging duration, the second end of the switch unit conducts with the internal power ground.

[0009] Optionally, the voltage division circuit includes a first voltage division resistor R1 and a second voltage division resistor R2;

[0010] One end of the first voltage division resistor R1 is used to connect to the negative pole of the main control unit, and the other end is connected to one end of the second voltage division resistor R2 and serves as the output end of the voltage division circuit;

[0011] The other end of the second voltage division resistor R2 is used to connect to the positive pole of the main control unit.

[0012] Optionally, the switch unit includes a control circuit and a switch circuit;

[0013] The first end of the control circuit is connected to the first end of the voltage dividing circuit, the second end of the control circuit is connected to the second end of the voltage dividing circuit, and the third end of the control circuit is connected to the control end of the switching circuit;

[0014] The second end of the switching circuit is connected to the second end of the control circuit, and the third end of the switching circuit is connected to the internal power ground.

[0015] Optionally, the control circuit includes a third resistor R3 and a capacitor C1;

[0016] One end of the third resistor R3 is connected to the first end of the voltage dividing circuit, and the other end is connected to one end of the capacitor C1; the other end of the capacitor C1 is used to be connected to the negative pole of the main control unit;

[0017] Wherein, when the preset charging duration is greater than or equal to R3*C1, the control circuit controls the switching circuit to conduct.

[0018] Optionally, the switching circuit includes an NMOS device, the control end of the NMOS device is connected to the connection point of the third resistor R3 and the capacitor C1, the source of the NMOS device is connected to the other end of the capacitor C1, and the drain of the NMOS device is connected to the internal power ground.

[0019] Optionally, the switching circuit includes an NMOS device, a third voltage dividing resistor R7 and a fourth voltage dividing resistor R8;

[0020] One end of the third voltage dividing resistor R7 is connected to the connection point of the third resistor R3 and the capacitor C1, and the other end of the third voltage dividing resistor R7 is connected to one end of the fourth voltage dividing resistor R8;

[0021] The other end of the fourth voltage dividing resistor R8 is connected to the source of the NMOS device;

[0022] The gate of the NMOS device is connected to the connection point of the third voltage dividing resistor R7 and the fourth voltage dividing resistor R8, and the drain of the NMOS device is connected to the internal power ground.

[0023] Optionally, the brush head type identification circuit further includes a rear lamp circuit, one end of the rear lamp circuit is used to be connected to the positive pole of the main control unit, and the other end of the rear lamp circuit and the third end of the switching unit are connected to the same internal power ground;

[0024] When the charging duration received by the switching unit reaches the preset charging duration, the switching unit controls the rear lamp circuit to conduct with the main control unit.

[0025] Optionally, the brush head type recognition circuit further includes a main control unit. The main control circuit of the main control unit includes a pin provided with an ADC module, and the output end of the voltage dividing circuit is connected to the pin.

[0026] In a second aspect, an embodiment of the present application further provides a brush head. The brush head includes the brush head type recognition circuit as described above.

[0027] In a third aspect, an embodiment of the present application further provides an electric toothbrush. The electric toothbrush includes the brush head as described above.

[0028] Optionally, the electric toothbrush further includes a brush handle provided with a main control unit. The main control circuit of the main control unit includes a pin provided with an ADC module, and the output end of the voltage dividing circuit is connected to the pin.

[0029] According to the embodiment of the present application, the brush head type recognition circuit generates a divided voltage corresponding to the brush head type through the voltage dividing circuit, thereby realizing the recognition of the brush head type; and the switch unit controls the on / off of the switch unit according to the charging time. After the brush head type is determined, the subsequent functions of the electric toothbrush can be realized. By adding a small number of circuit components on the basis of the brush head circuit in the embodiment of the present application, the recognition function of different types of brush heads can be completed, that is, the purpose of recognizing the brush head type can be achieved in a more economical way.

[0030] Through the following detailed description of the exemplary embodiments of the present specification with reference to the accompanying drawings, other features and advantages of the present specification will become clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings incorporated in the specification and constituting a part of the specification illustrate the embodiments of the present specification, and together with the description are used to explain the principles of the present specification.

[0032] Figure 1 The circuit principle of the brush head type recognition circuit provided by the embodiment of the present application is shown. Figure 1 .

[0033] Figure 2 The schematic structural diagram of the electric brush head provided by the embodiment of the present application is shown.

[0034] Figure 3 The circuit principle of the brush head type recognition circuit provided by the embodiment of the present application is shown. Figure 2 .

[0035] Description of the reference numerals:

[0036] 1. Main control unit; 2. Voltage dividing circuit; 3. Switch unit; 31. Control circuit; 32. Switch circuit; 4. Rear lamp circuit;

[0037] 5. Brush handle; 51. Brush handle body; 52. Motor rod; 521. Probe docking module;

[0038] 6. Brush head; 61. Brush head circuit board; 62. Brush head docking part;

[0039] 71. Positive lead; 72. Negative lead. Detailed implementation manners

[0040] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0041] The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present application or its application or use.

[0042] Techniques and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques and devices should be regarded as part of the specification.

[0043] In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0044] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0045] The embodiment of the present application provides a brush head type recognition circuit. When this recognition circuit is applied to the brush head, different types of brush heads in an electric toothbrush can be recognized. Compared with the prior art that uses NFC technology to recognize the brush head, the embodiment of the present application only needs to add a small number of circuit components on the basis of the brush head circuit to complete the recognition function of different types of brush heads, that is, to achieve the purpose of recognizing the brush head type in a more economical way.

[0046] Refer to Figure 1 , the brush head type recognition circuit includes: a voltage dividing circuit 2 and a switching unit 3.

[0047] The first end a of the voltage dividing circuit 2 is used to connect to the positive pole of the main control unit 1, the second end b of the voltage dividing circuit 2 is used to connect to the negative pole of the main control unit 1, and the output end c of the voltage dividing circuit 2 is used to output a voltage dividing voltage for recognizing the brush head type.

[0048] The first end d of the switch unit 3 is connected to the first end a of the voltage dividing circuit 2, the second end e of the switch unit 3 is connected to the second end b of the voltage dividing circuit 2, and the third end f of the switch unit is connected to the internal power ground GND.

[0049] Wherein, when the charging time received by the switch unit reaches a preset charging duration, the second end of the switch unit and the internal power ground are turned on.

[0050] In the embodiment of the present application, the design of the voltage dividing circuit 2 is to generate a voltage division voltage corresponding to the type of the brush head. The first end a of the voltage dividing circuit 2 is connected to the positive pole of the main control unit 1, the second end b of the voltage dividing circuit 2 is connected to the negative pole of the main control unit 1, and the output end c outputs the voltage division voltage for identifying the type of the brush head. This setting of the voltage dividing circuit can ensure that when different types of brush heads are connected to the circuit, different voltage values are generated by voltage division, so as to be recognized by the main control unit. Among them, the brush head type identification circuit is applied to the brush head. The brush head type identification circuit may or may not include the main control unit 1. When the brush head type identification circuit includes the main control unit 1, the brush head type identification circuit is applied to the brush head, and the brush head has its own main control circuit. When the brush head type identification circuit does not include the main control unit, the main control unit can be arranged in other parts of the electric toothbrush, for example, the main control unit is arranged in the handle of the electric toothbrush.

[0051] The design of the switch unit 3 is mainly to control the on-off of the circuit. The first end d of the switch unit 3 is connected to the first end a of the voltage dividing circuit 2, the second end e of the switch unit 3 is connected to the second end b of the voltage dividing circuit 2, and the third end f of the switch unit 3 is connected to the internal power ground GND. The switch unit 3 plays a key role here: when the charging time received by the switch unit 3 reaches a preset charging duration, the second end e of the switch unit 3 will be turned on with the internal power ground GND. In this way, after the charging reaches a specific duration, the power supply operation of the brush head can be realized through the conduction of the switch unit 3.

[0052] That is to say, when the charging duration received by the switch unit 3 does not reach the preset charging duration, in the brush head type identification circuit, only the voltage dividing circuit 2 works, and the voltage division voltage output by the voltage dividing circuit 2 can identify the type of the brush head. After the type of the brush head is identified, and when the charging duration received by the switch unit 3 reaches the preset charging duration, at this time the switch unit 3 works, so that the user can normally use the electric toothbrush.

[0053] Therefore, in the embodiments of the present application, the brush head type recognition circuit generates a divided voltage corresponding to the brush head type through a voltage dividing circuit, thereby realizing the recognition of the brush head type; and the switch unit controls the on / off of the switch unit according to the charging time. After the brush head type is determined, the subsequent functions of the electric toothbrush can be realized. By adding a small number of circuit components on the basis of the brush head circuit in the embodiments of the present application, the recognition function of different types of brush heads can be completed, that is, the purpose of recognizing the brush head type can be achieved in a more economical way.

[0054] In one embodiment, referring to Figure 1 , the voltage dividing circuit 2 includes a first voltage dividing resistor R1 and a second voltage dividing resistor R2;

[0055] One end of the first voltage dividing resistor R1 is used to connect to the negative pole of the main control unit 1, and the other end is connected to one end of the second voltage dividing resistor R2 and serves as the output terminal c of the voltage dividing circuit 2;

[0056] The other end of the second voltage dividing resistor R2 is used to connect to the positive pole of the main control unit 1.

[0057] In this embodiment, the design of the voltage dividing circuit 2 is further specified. The voltage dividing circuit 2 is mainly composed of a first voltage dividing resistor R1 and a second voltage dividing resistor R2.

[0058] One end of the first voltage dividing resistor R1 is connected to the negative pole of the main control unit 1, and the other end is connected to one end of the second voltage dividing resistor R2 and serves as the output terminal c of the voltage dividing circuit. Such a connection method forms a voltage dividing point between the first voltage dividing resistor R1 and the second voltage dividing resistor R2, and the voltage value at this point depends on the resistance ratio of the two resistors and the power supply voltage provided by the main control unit 1. The other end of the second voltage dividing resistor R2 is connected to the positive pole of the main control unit 1, which ensures the integrity of the power supply connection between the voltage dividing circuit and the main control unit.

[0059] Specifically, the resistance values of the first voltage dividing resistor R1 and the second voltage dividing resistor R2 included in the voltage dividing circuit 2 of different types of brush heads are different, so that the output terminal c of the voltage dividing circuit 2 outputs different divided voltages, and the brush head type can be determined according to different divided voltage values.

[0060] Therefore, in this embodiment, when different types of brush heads are connected to the circuit, due to the different resistances or other electrical characteristics of the brush heads themselves, the voltage value at the output terminal c of the voltage dividing circuit will change. The main control unit can judge the type of the currently connected brush head by reading the voltage value of this output terminal c.

[0061] In one embodiment, referring to Figure 1 , the switch unit 3 includes a control circuit 31 and a switch circuit 32.

[0062] The first terminal d of the control circuit 31 is connected to the first terminal a of the voltage dividing circuit 2, the second terminal e of the control circuit 31 is connected to the second terminal b of the voltage dividing circuit 2, and the third terminal g of the control circuit 31 is connected to the control terminal h of the switching circuit 32.

[0063] The second terminal I of the switching circuit 32 is connected to the second terminal of the control circuit 31, and the third terminal of the switching circuit 32 is connected to the internal power ground GND.

[0064] In this embodiment, the switching unit 3 is subdivided into two parts, namely a control circuit 31 and a switching circuit 32. This design makes the function of the switching unit 3 clearer and more modular.

[0065] The control circuit 31 is mainly used to control the on / off of the switching circuit 32. For example, the control circuit 31 can be a charging delay circuit. When the charging duration received by the control circuit 31 reaches the preset charging duration, the control circuit 31 controls the switching circuit 32 to conduct with the main control unit 1.

[0066] Specifically, the first terminal d of the control circuit 31 is connected to the first terminal a of the voltage dividing circuit 2. In fact, the first terminal d of the control circuit 31 is connected to the positive pole of the main control unit 1. The first terminal d of the control circuit 31 is usually used to provide power or signal voltage.

[0067] The second terminal e of the control circuit 31 is connected to the second terminal b of the voltage dividing circuit 2. In fact, the second terminal e of the control circuit 31 is connected to the negative pole of the main control unit 1. The second terminal e of the control circuit 31 is usually the negative pole of the power supply or the reference point.

[0068] The third terminal g of the control circuit 31 is connected to the control terminal h of the switching circuit 32. This port is used to send a control signal to the switching circuit 32 to determine whether it should be opened or closed.

[0069] The switching circuit 32 controls the on / off of the circuit according to the instruction of the control circuit 31. The second terminal I of the switching circuit 32 is connected to the second terminal of the control circuit 31, and the third terminal f is connected to the internal power ground GND. The second terminal I of the switching circuit 32 is connected to the second terminal e of the control circuit 31, which means that they share the same reference point (the negative pole of the main control unit 1). The third terminal f of the switching circuit 32 is connected to the internal power ground GND, which indicates that this terminal is the grounding terminal of the switching circuit and is used to provide a stable reference voltage.

[0070] When the main control unit 1 needs to control the switching state of the switching circuit 32, it sends a signal through the control circuit 31. This signal is transmitted to the control terminal h of the switching circuit 32 through the third terminal g of the control circuit 31. According to this signal, the switching circuit 32 decides whether to allow current to pass (i.e., open) or block current from passing (i.e., close).

[0071] Since the second terminal I of the switch circuit 32 is connected to the second terminal e of the control circuit 31 (i.e., the negative pole of the main control unit), and its third terminal is grounded, the operation of the switch circuit 32 is carried out with respect to these two reference points.

[0072] In this embodiment, the switch unit 3 flexibly responds to the control signal of the main control unit 1 and opens or closes the circuit as needed, thereby realizing the control of the load.

[0073] In one embodiment, referring to Figure 1 , the control circuit 31 includes a third resistor R3 and a capacitor C1.

[0074] One end of the third resistor R3 is connected to the first terminal a of the voltage dividing circuit 2, and the other end is connected to one end of the capacitor C1; the other end of the capacitor C1 is used to be connected to the negative pole of the main control unit 1;

[0075] Wherein when the preset charging time is greater than or equal to R3*C1, the control circuit 31 controls the switch circuit 32 to conduct.

[0076] In this embodiment, the specific implementation of the control circuit 31 is described in detail. The control circuit 31 is mainly composed of a third resistor R3 and a capacitor C1.

[0077] One end of the third resistor R3 is connected to the first terminal a of the voltage dividing circuit 2, and the other end is connected to one end of the capacitor C1. The other end of the capacitor C1 is connected to the negative pole of the main control unit 1, forming a charging loop. When the circuit starts to work, the current will charge the capacitor C1 through the third resistor R3.

[0078] The length of the charging time depends on the resistance value of the third resistor R3 and the capacitance of the capacitor C1. When the preset charging time is greater than or equal to R3*C1, it means that the capacitor C1 has been charged to a sufficient voltage level. At this time, the control circuit 31 will send a control signal to the switch circuit 32 according to this charging state to make it conduct.

[0079] This design utilizes the charging characteristics of the resistor and the capacitor to realize the control of the switch circuit 32. By reasonably setting the resistance value of the third resistor R3 and the capacitance of the capacitor C1, the conduction time of the switch circuit 32 can be accurately controlled to meet specific application requirements.

[0080] In one embodiment, referring to Figure 1 , the switch circuit 32 includes an NMOS device. The control terminal h of the NMOS device is connected to the connection point of the third resistor R3 and the capacitor C1. The source electrode of the NMOS device is connected to the other end of the capacitor C1, and the drain electrode of the NMOS device is connected to the internal power ground.

[0081] In this embodiment, the switching circuit 32 uses an NMOS (N-type metal-oxide semiconductor) device as the switching element. The NMOS device is a commonly used field-effect transistor, which has the advantages of high input resistance, low noise, low power consumption, and easy integration, and is very suitable for use in switching circuits.

[0082] The control terminal (gate) of the NMOS device is connected to the connection point of the third resistor R3 and the capacitor C1. This means that when the capacitor C1 is charged to a certain voltage through the third resistor R3, this voltage will be applied to the gate of the NMOS device. The source of the NMOS device is connected to the other end of the capacitor C1, that is, connected to the negative pole of the main control unit 1. The drain of the NMOS device is connected to the internal power ground GND.

[0083] In the normal operating state, when the capacitor C1 is charged to the preset voltage level, the gate voltage of the NMOS device will reach its threshold voltage, causing the NMOS device to conduct. At this time, a path is formed between the drain and the source of the NMOS device, connecting the internal power ground GND to the negative pole of the main control unit 1. This conducting state allows current to flow through the NMOS device to the internal power ground, thereby changing the operating state of the circuit or triggering a specific operation.

[0084] By using the NMOS device as the core element of the switching circuit 32, this embodiment provides a reliable and efficient switching control mechanism. This design can accurately control the on and off of the circuit and automatically trigger the switching action when the preset charging time condition is met. This flexibility enables the brush head type identification circuit to adapt to different application scenarios and working requirements.

[0085] In one embodiment, referring to Figure 3 , the switching circuit 32 includes an NMOS device, a third voltage-dividing resistor R7, and a fourth voltage-dividing resistor R8;

[0086] One end of the third voltage-dividing resistor R7 is connected to the connection point of the third resistor R3 and the capacitor C1, and the other end of the third voltage-dividing resistor R7 is connected to one end of the fourth voltage-dividing resistor R8;

[0087] The other end of the fourth voltage-dividing resistor R8 is connected to the source of the NMOS device;

[0088] The gate of the NMOS device is connected to the connection point of the third voltage-dividing resistor R7 and the fourth voltage-dividing resistor R8, and the drain of the NMOS device is connected to the internal power ground.

[0089] In this embodiment, two voltage-dividing resistors are arranged on the switch circuit 32 to better control the VGS (Gate-Source Voltage, that is, the potential difference between the Gate and the Source) conduction voltage value when selecting the NMOS.

[0090] Among them, the functions of the third voltage-dividing resistor R7 and the fourth voltage-dividing resistor R8 in the circuit are to distribute voltage. By reasonably selecting the resistance values of the voltage-dividing resistors, the VGS voltage value when selecting the NMOS can be controlled.

[0091] During the process of selecting the NMOS (N-type Metal Oxide Semiconductor), VGS (Gate-Source Voltage) is a key parameter, which determines the conduction state of the NMOS. Through the third voltage-dividing resistor R7 and the fourth voltage-dividing resistor R8, the value of VGS can be adjusted, so as to achieve better control of the NMOS conduction voltage value.

[0092] Specifically, by adjusting the resistance values of the voltage-dividing resistors, the voltage distribution in the circuit can be changed, so that the voltage VGS between the gate and the source of the NMOS reaches a suitable range. This can ensure that the NMOS can stably operate in the required conduction state when selected, and at the same time avoid performance problems or damages that may be caused by too high or too low VGS value.

[0093] Therefore, two voltage-dividing resistors are arranged in the switch circuit 32 to better meet the control requirements of the VGS conduction voltage value when selecting the NMOS, and to ensure the stability and reliability of the circuit.

[0094] In one embodiment, referring to Figure 1 , the brush head type identification circuit further includes a rear lamp circuit 4. One end of the rear lamp circuit 4 is used to connect to the positive pole of the main control unit 1, and the other end of the rear lamp circuit 4 is connected to the same internal power ground as the third end of the switch unit 3;

[0095] When the charging duration received by the switch unit 3 reaches the preset charging time, the switch unit 3 controls the rear lamp circuit 4 to conduct with the main control unit 1.

[0096] In this embodiment, the brush head type identification circuit is further expanded, and a rear lamp circuit 4 is added. The design of the rear lamp circuit 4 is mainly to provide visual feedback or indication under specific conditions. Specifically, the rear lamp circuit includes three diodes, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. Among them, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 are respectively connected in series with a diode to form a branch circuit. The rear lamp circuit includes three branch circuits, and these three branch circuits are connected in parallel.

[0097] One end of the rear lamp circuit 4 is connected to the positive pole of the main control unit 1, and the other end is connected to the third terminal f of the switch unit 3 to the same internal power ground GND. This connection method ensures the integrity of the electrical connection between the rear lamp circuit 4, the main control unit 1, and the switch unit 3.

[0098] When the charging duration received by the switch unit 3 reaches the preset charging duration, the switch unit 3 controls the rear lamp circuit 4 to conduct with the main control unit 1. Specifically, the switch circuit 32 (such as an NMOS device) in the switch unit 3 conducts after receiving sufficient charging signals, thereby connecting the rear lamp circuit 4 to the main control unit 1. At this time, the lamps (such as LED lamps) in the rear lamp circuit 4 will light up to provide visual feedback or indication.

[0099] This design enables the brush head type recognition circuit to give a clear indication through the lighting of the rear lamp circuit 4 when a specific type of brush head is recognized. This not only improves the user experience but also makes the recognition result of the brush head type more intuitive and easy to understand.

[0100] In one embodiment, referring to Figure 1 , the brush head type recognition circuit further includes a main control unit, and the main control circuit of the main control unit includes a pin provided with an ADC module, and the output end of the voltage dividing circuit is connected to the pin.

[0101] In this embodiment, the brush head type recognition circuit is further improved, especially in terms of the main control unit 1. The main control unit 1 is the core of the entire brush head type recognition circuit, responsible for receiving and processing signals from the voltage dividing circuit 2 and judging the type of the brush head according to these signals.

[0102] The main control circuit of the main control unit 1 includes a pin (not shown in the figure) provided with an ADC (analog-to-digital converter) module. The function of the ADC module is to convert analog signals into digital signals for subsequent processing and analysis by the main control unit 1.

[0103] The output end of the voltage dividing circuit 2 is connected to the pin of the main control unit 1 provided with the ADC module. This means that the divided voltage corresponding to the brush head type generated by the voltage dividing circuit 2 will be directly transmitted to the pin of the ADC module. The ADC module will convert this analog divided voltage into a digital signal, and then the main control unit 1 will read this digital signal and judge the type of the currently connected brush head according to a preset algorithm or logic.

[0104] This design enables the brush head type recognition circuit to more accurately recognize different types of brush heads. Since the ADC module can convert analog signals into digital signals, the main control unit 1 can more precisely read and analyze the output of the voltage dividing circuit, thereby more accurately judging the type of the brush head.

[0105] The embodiment of the present application also provides a brush head. The brush head includes the brush head type recognition circuit as described above.

[0106] The embodiment of the present application provides a brush head. The brush head includes a brush head type recognition circuit containing a main control unit, a voltage dividing circuit, a control circuit, a switching circuit, and a rear lamp circuit, enabling the brush head to have its own main control unit (driver). The brush head realizes the recognition of the brush head type through the built-in brush head type recognition circuit.

[0107] The embodiment of the present application also provides an electric toothbrush. The electric toothbrush includes the brush head as described above.

[0108] The embodiment of the present application provides an electric toothbrush. The electric toothbrush includes a brush head with a brush head type recognition circuit, enabling the electric toothbrush to recognize the brush head type.

[0109] In one embodiment, referring to Figure 2 , the electric toothbrush further includes a brush handle 5 provided with a main control unit 1. The main control circuit of the main control unit 1 includes a pin provided with an ADC module, and the output end of the voltage dividing circuit is connected to the pin.

[0110] In this embodiment, the design of the electric toothbrush is more perfect and intelligent. In addition to the above-mentioned brush head part including a brush head type recognition circuit, the electric toothbrush further includes a brush handle 5 provided with a main control unit 1. This main control unit 1 is the core control part of the entire electric toothbrush, responsible for receiving, processing, and executing various operation instructions.

[0111] The main control circuit of the main control unit 1 is a key component. It includes many functional modules, and an important module among them is the ADC (analog-to-digital converter) module. The main function of the ADC module is to convert analog signals into digital signals so that the main control unit can process them.

[0112] In this embodiment, the output end of the voltage dividing circuit 2 is directly connected to the pin of the main control unit 1 provided with the ADC module. The output end of the voltage dividing circuit 2 outputs an analog signal, which reflects the state or parameter information of the brush head type recognition circuit. When this analog signal is transmitted to the pin of the ADC module, the ADC module will convert it into a digital signal, and then the main control unit can read and process these digital signals to obtain the state or parameter information of the brush head.

[0113] In a specific embodiment, referring to Figure 2 , the brush handle 5 includes a brush handle body 51 and a motor rod 52, the brush head 6 includes a brush head circuit board 61 and a brush head docking part 62, and the brush head docking part 62 is connected to the motor rod 52.

[0114] One end of the motor rod 52 is connected to the brush handle body 51. A probe docking module 521 is provided at the other end of the motor rod 52. The brush handle body 51 is provided with a negative lead 72 and a positive lead 71. The negative lead 72 extends to the outer metal surface on the motor rod 52, and the outer metal surface on the motor rod 52 serves as the negative electrode. The positive lead 71 extends to the probe docking module 521 on the motor rod 52, and the probe docking module 521 serves as the positive electrode. When the brush head is connected to the motor rod 52, the positive electrode of the brush head type recognition circuit is connected to the probe docking module 521, and the negative electrode of the brush head type recognition circuit is connected to the outer metal surface on the motor rod 52.

[0115] In the above embodiments, the differences between the various embodiments are mainly described. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a more optimal embodiment. Considering the simplicity of the text, it will not be elaborated here.

[0116] Although some specific embodiments of the present application have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A brush head type identification circuit, characterized in that: include: A voltage divider circuit (2) and a switch unit (3); The first end (a) of the voltage divider circuit (2) is used to be connected to the positive electrode of the main control unit (1), the second end (b) of the voltage divider circuit (2) is used to be connected to the negative electrode of the main control unit (1), and the output end (c) of the voltage divider circuit (2) is used to output a divided voltage for identifying the type of brush head; The first end (d) of the switch unit (3) is connected to the first end (a) of the voltage divider circuit (2), the second end (e) of the switch unit (3) is connected to the second end (b) of the voltage divider circuit (2), and the third end (f) of the switch unit is connected to the internal power ground (GND); Wherein, when the charging time received by the switch unit (3) reaches a preset charging time, the second end of the switch unit (3) is connected to the internal power supply ground.

2. The brush head type identification circuit according to claim 1, characterized in that: The voltage dividing circuit (2) comprises a first voltage dividing resistor R1 and a second voltage dividing resistor R2; One end of the first voltage-dividing resistor R1 is used to be connected to the negative electrode of the main control unit (1), and the other end is connected to one end of the second voltage-dividing resistor R2 and serves as the output end (c) of the voltage-dividing circuit (2); The other end of the second voltage-dividing resistor R2 is used to be connected to the positive electrode of the main control unit (1).

3. The brush head type identification circuit according to claim 1, characterized in that: The switch unit (3) comprises a control circuit (31) and a switch circuit (32); The first end of the control circuit (31) is connected to the first end (a) of the voltage divider circuit (2), the second end of the control circuit (31) is connected to the second end (b) of the voltage divider circuit (2), and the third end (g) of the control circuit (31) is connected to the control end (h) of the switch circuit (32); The second end (I) of the switch circuit (32) is connected to the second end of the control circuit (31), and the third end of the switch circuit (32) is connected to an internal power ground (GND).

4. The brush head type identification circuit according to claim 3, characterized in that: The control circuit (31) comprises a third resistor R3 and a capacitor C1; One end of the third resistor R3 is connected to the first end of the voltage divider circuit (2), and the other end is connected to one end of the capacitor C1; the other end of the capacitor C1 is used to be connected to the negative electrode of the main control unit; When the preset charging time is greater than or equal to R3*C1, the control circuit (31) controls the switch circuit (32) to be turned on.

5. The brush head type identification circuit according to claim 4, characterized in that: The switch circuit (32) comprises an NMOS device, a control end of the NMOS device is connected to the connection point of the third resistor R3 and the capacitor C1, a source of the NMOS device is connected to the other end of the capacitor C1, and a drain of the NMOS device is connected to an internal power ground.

6. The brush head type identification circuit according to claim 4, characterized in that: The switch circuit (32) comprises an NMOS device, a third voltage-dividing resistor R7 and a fourth voltage-dividing resistor R8; One end of the third voltage-dividing resistor R7 is connected to the connection point of the third resistor R3 and the capacitor C1, and the other end of the third voltage-dividing resistor R7 is connected to one end of the fourth voltage-dividing resistor R8; The other end of the fourth voltage-dividing resistor R8 is connected to the source of the NMOS device; The gate of the NMOS device is connected to a connection point between the third voltage-dividing resistor R7 and the fourth voltage-dividing resistor R8, and the drain of the NMOS device is connected to an internal power ground.

7. The brush head type identification circuit according to any one of claims 1 to 6, characterized in that: The brush head type identification circuit further comprises a rear light circuit (4), one end of the rear light circuit (4) being used to be connected to the positive electrode of the main control unit (1), and the other end of the rear light circuit (4) and the third end of the switch unit (3) being connected to the same internal power supply ground; When the charging time received by the switch unit (3) reaches the preset charging time, the switch unit (3) controls the rear light circuit (4) to be connected to the main control unit (1).

8. The brush head type identification circuit according to claim 7, characterized in that: The brush head type identification circuit further comprises a main control unit (1); the main control circuit of the main control unit (1) comprises a pin provided with an ADC module, and the output end of the voltage divider circuit (2) is connected to the pin.

9. A brush head, characterized in that: The brush head comprises a brush head type identification circuit as claimed in any one of claims 1 to 8.

10. An electric toothbrush, characterized in that: The electric toothbrush comprises the brush head according to claim 9.

11. The electric toothbrush according to claim 10, characterized in that: The electric toothbrush also comprises a brush handle provided with a main control unit (1); the main control circuit of the main control unit (1) comprises a pin provided with an ADC module, and the output end of the voltage divider circuit (2) is connected to the pin.

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