Motor signal sampling circuit and intelligent massage device

Abstract

The application discloses a motor signal sampling circuit and an intelligent massage device, and relates to the technical field of overcurrent protection.The motor signal sampling circuit comprises a sampling resistor unit, a signal amplification unit, a peak value sampling unit and a signal following unit.The resistance sampling end of the sampling resistor unit is connected with the signal sampling end of a motor, and is used for collecting the sampling signal of the signal sampling end.The input end of the signal amplification unit is connected with the resistance sampling end, and is used for amplifying the sampling signal to obtain an amplified signal.The input end of the peak value sampling unit is connected with the output end of the signal amplification unit, and is used for extracting the peak value signal of the amplified signal.The input end of the signal following unit is connected with the output end of the peak value sampling unit, and is used for outputting the peak value signal.The input end of a motor controller is connected with the output end of the signal following unit, and the output end of the motor controller is connected with the control end of the motor, which is used for receiving the peak value signal output by the signal following unit, and controlling the motor based on the peak value signal.The application improves the accuracy of motor control.

Description

Technical Field

[0001] This application relates to the field of signal sampling technology, and in particular to a motor signal sampling circuit and an intelligent massage device. Background Technology

[0002] As motors are used more and more widely in various fields, users are also putting forward higher requirements for motor signal sampling circuits.

[0003] Traditional motor signal sampling circuits acquire motor signals directly by obtaining the voltage divider across the sampling resistor, and then control the motor based on this voltage divider. However, this type of motor signal sampling circuit has a significant drawback: the voltage divider across the sampling resistor cannot accurately reflect the actual condition of the motor. In other words, this type of motor signal sampling circuit results in low accuracy in motor control because the voltage divider across the sampling resistor cannot accurately reflect the actual condition of the motor.

[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Utility Model Content

[0005] The main purpose of this application is to provide a motor signal sampling circuit and an intelligent massage device, which aims to solve the technical problem of low accuracy in motor control.

[0006] To achieve the above objectives, this application provides a motor signal sampling circuit, which includes:

[0007] A sampling resistor unit, wherein the resistor sampling terminal of the sampling resistor unit is connected to the signal sampling terminal of the motor, and the sampling resistor unit is used to collect the sampling signal of the signal sampling terminal;

[0008] A signal amplification unit, wherein the input terminal of the signal amplification unit is connected to the resistor sampling terminal, and the signal amplification unit is used to amplify the sampled signal to obtain an amplified signal;

[0009] A peak sampling unit, the input of which is connected to the output of the signal amplification unit, is used to extract the peak signal of the amplified signal;

[0010] A signal follower unit, wherein the input terminal of the signal follower unit is connected to the output terminal of the peak sampling unit, and the signal follower unit is used to output the peak signal;

[0011] A motor controller, wherein the input terminal of the motor controller is connected to the output terminal of the signal following unit, and the output terminal of the motor controller is connected to the control terminal of the motor, and the motor controller is used to receive the peak signal output by the signal following unit in order to control the motor based on the peak signal.

[0012] In one embodiment, the sampling resistor unit includes:

[0013] A sampling resistor, the first end of which is grounded, and the second end of which serves as the resistor sampling terminal and is connected to the signal sampling terminal and the input terminal of the signal amplification unit.

[0014] In one embodiment, the signal amplification unit includes:

[0015] The first resistor, the first end of which serves as the input terminal of the signal amplification unit and is connected to the resistor sampling terminal;

[0016] The first operational amplifier chip has its first input terminal connected to the second terminal of the first resistor, and its output terminal serves as the output terminal of the signal amplification unit and is connected to the input terminal of the peak sampling unit.

[0017] The second resistor subunit has a first terminal grounded and a second terminal connected to the second input terminal of the first operational amplifier chip.

[0018] The third resistor has its first end connected to the second input terminal of the first operational amplifier chip, and its second end connected to the output terminal of the first operational amplifier chip.

[0019] In one embodiment, the signal amplification unit further includes:

[0020] A peak comparison subunit is provided, wherein the first end of the peak comparison subunit is connected to the output end of the peak sampling unit, the second end of the peak comparison subunit is connected to a peak threshold signal, and the output end of the peak comparison subunit is connected to the control end of the second resistor subunit, wherein the peak threshold signal is the maximum charging voltage of the first capacitor in the peak sampling unit.

[0021] In one embodiment, the peak comparison subunit includes:

[0022] The comparison operational amplifier chip has its first input terminal connected to the output terminal of the peak sampling unit, its second input terminal connected to the peak threshold signal, and its output terminal connected to the control terminal of the second resistor subunit.

[0023] In one embodiment, the second resistive subunit includes:

[0024] The fourth resistor, the first end of which serves as the first end of the second resistor subunit;

[0025] A fifth resistor, the first end of which is connected to the first end of the fourth resistor, wherein the resistance values ​​of the fourth resistor and the fifth resistor are different;

[0026] A selector is provided, wherein the first selector terminal of the selector is connected to the second terminal of the fourth resistor, the first selector terminal of the selector is connected to the second terminal of the fifth resistor, the output terminal of the selector serves as the second terminal of the second resistor subunit and is connected to the second input terminal of the first operational amplifier chip, and the control terminal of the selector serves as the control terminal of the second resistor subunit and is connected to the output terminal of the comparator operational amplifier chip.

[0027] In one embodiment, the peak sampling unit includes:

[0028] The second operational amplifier chip has its first input terminal serving as the input terminal of the peak sampling unit and connected to the output terminal of the signal amplification unit.

[0029] The first diode has its anode connected to the output terminal of the second operational amplifier chip, and its cathode serves as the output terminal of the peak sampling unit and is connected to the input terminal of the signal follower unit.

[0030] The first capacitor has its first terminal grounded, and its second terminal is connected to the cathode of the first diode and the second input terminal of the second operational amplifier chip.

[0031] In one embodiment, the signal following unit includes:

[0032] The third operational amplifier chip has its first input terminal serving as the input terminal of the signal follower unit and connected to the output terminal of the peak sampling unit. The second input terminal of the third operational amplifier chip is connected to the output terminal of the third operational amplifier chip and then serves as the output terminal of the signal follower unit.

[0033] In addition, to achieve the above objectives, an intelligent massage device is also provided, which includes the aforementioned motor signal sampling circuit.

[0034] In one embodiment, the smart massage device further includes:

[0035] Electric motor;

[0036] The motor drive circuit has a power supply terminal connected to the motor power supply, a first terminal connected to the motor, a second terminal serving as the signal sampling terminal of the motor and connected to the resistor sampling terminal in the motor signal sampling circuit, and a third terminal connected to the motor controller in the motor signal sampling circuit.

[0037] This application provides a motor signal sampling circuit, including a sampling resistor unit, the sampling terminal of which is connected to the signal sampling terminal of the motor, for acquiring the sampled signal from the signal sampling terminal; a signal amplification unit, the input terminal of which is connected to the sampling terminal, for amplifying the sampled signal to obtain an amplified signal; a peak sampling unit, the input terminal of which is connected to the output terminal of the signal amplification unit, for extracting the peak signal of the amplified signal; a signal follower unit, the input terminal of which is connected to the output terminal of the peak sampling unit, for outputting the peak signal; and a motor controller, the input terminal of which is connected to the output terminal of the signal follower unit, and the output terminal of which is connected to the control terminal of the motor, for using... This motor signal sampling circuit receives the peak signal output from the signal follower unit and controls the motor based on the peak signal. It acquires the sampled signal from the signal sampling terminal through a sampling resistor unit, processes the sampled signal through a signal amplification unit and a peak sampling unit to obtain the peak signal, and then outputs the peak signal to the motor controller through the signal follower unit. This allows the motor controller to control the motor based on the peak signal, thus avoiding the phenomenon where the voltage division of the sampling resistor cannot accurately reflect the actual situation of the motor. This motor signal sampling circuit can acquire the peak signal based on the above circuit and control the motor based on the peak signal. It avoids the problem that the voltage division signal (which cannot reflect the voltage peak) cannot accurately reflect the actual situation of the motor, and using the peak signal for motor control improves the accuracy of motor control. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the framework of the first embodiment of the motor signal sampling circuit of this application;

[0039] Figure 2 This is a schematic diagram of the circuit connection of the first embodiment of the motor signal sampling circuit of this application;

[0040] Figure 3 This is a circuit connection diagram of a second embodiment of the motor signal sampling circuit of this application;

[0041] Figure 4 This is a schematic diagram of the circuit connection of the third embodiment of the motor signal sampling circuit of this application;

[0042] Figure 5 This is a circuit connection diagram of the fourth embodiment of the motor signal sampling circuit of this application;

[0043] Figure 6 This is a circuit connection diagram of the first embodiment of the intelligent massage device of this application.

[0044] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0045] Explanation of icon numbers:

[0046] 100. Motor signal sampling circuit; 10. Sampling resistor unit; 20. Signal amplification unit; 30. Peak sampling unit; 40. Signal follower unit; 50. Motor controller; 210. Signal sampling terminal; 220. Motor control terminal; RX. Sampling resistor; R1. First resistor; R2. Second resistor; R3. Third resistor; R4. Fourth resistor; R5. Fifth resistor; AP1. First operational amplifier chip; AP2. Second operational amplifier chip; D1. First diode; C1. First capacitor; AP3. Third operational amplifier chip; AP4. Comparison operational amplifier chip; 300. Motor drive circuit; VCC. Motor power supply; 200. Motor; 21. Second resistor subunit; 211. On-selection device; V2T. Peak threshold signal; V1. Sampling signal; V2. Amplified signal; V3 (V4). Peak signal; 60. Peak comparison subunit. Detailed Implementation

[0047] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0048] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0049] Because the output power of a motor fluctuates with the load at the downstream end, it affects the stability of the circuit and the performance of the motor. Currently, the common approach is for the MCU (Microcontroller Unit) to directly acquire the sampling signal from the sampling resistor for monitoring and control of the motor output. However, directly acquiring the sampling signal from the sampling resistor may result in the inclusion of high-frequency components. If the MCU's ADC (Analog-to-Digital Converter) sampling rate is too low (e.g., <1MHz), it can lead to signal aliasing, loss of critical transient information, and affect the normal feedback operation of the motor, resulting in low control accuracy and stability. It's worth noting that the reason for collecting peak voltage for feedback is that the control of motor speed and torque depends on precise voltage regulation. Peak voltage feedback reflects the effective value of the voltage actually applied to the motor windings, helping the controller correct the input signal and compensate for non-ideal factors such as line voltage drop and power device conduction voltage drop, thereby improving control response speed and steady-state accuracy.

[0050] Therefore, based on the shortcomings of the above motor signal sampling methods, the motor signal sampling circuit of this application is proposed: the sampling resistor unit 10 collects the sampling signal V1 from the signal sampling terminal 210, and processes the sampling signal V1 through the signal amplification unit 20 and the peak sampling unit 30 to obtain the peak signal V3. Then, the peak signal V3 is output to the motor controller 50 through the signal follower unit 40, so that the motor controller 50 controls the motor based on the peak signal V3. This avoids the phenomenon that the voltage division of the sampling resistor cannot accurately reflect the actual situation of the motor. This motor signal sampling circuit 100 can collect the peak signal V3 based on the above circuit and control the motor based on the peak signal V3. It can avoid the problem that the voltage division signal of the resistor (which cannot reflect the voltage peak) cannot accurately reflect the actual situation of the motor. Using the peak signal V3 to control the motor can improve the accuracy of motor control.

[0051] Based on this, the embodiments of this application provide a motor signal sampling circuit, referring to... Figure 1 , Figure 1 This is a schematic diagram of the framework of the first embodiment of the motor signal sampling circuit of this application.

[0052] Reference Figure 1 This application provides a motor signal sampling circuit 100, which includes:

[0053] The sampling resistor unit 10 is connected to the signal sampling terminal 210 of the motor 200. The sampling resistor unit 10 is used to collect the sampling signal V1 from the signal sampling terminal 210.

[0054] The signal amplification unit 20 has its input terminal connected to the resistor sampling terminal. The signal amplification unit 20 is used to amplify the sampled signal V1 to obtain the amplified signal V2.

[0055] Peak sampling unit 30, the input terminal of peak sampling unit 30 is connected to the output terminal of signal amplification unit 20, and peak sampling unit 30 is used to extract the peak signal V3 of amplified signal V2;

[0056] The signal follower unit 40 has its input terminal connected to the output terminal of the peak sampling unit 30, and is used to output the peak signal V3.

[0057] The motor controller 50 has its input terminal connected to the output terminal of the signal follower unit 40 and its output terminal connected to the control terminal 220 of the motor 200. The motor controller 50 is used to receive the peak signal V3 output by the signal follower unit 40 and to control the motor 200 based on the peak signal V3.

[0058] In this embodiment, to avoid the aforementioned drawbacks of directly acquiring the sampling signal, this application uses a sampling resistor unit 10 to acquire the sampling signal V1 from the signal sampling terminal 210. The sampling signal V1 is then processed before being used as the basis for controlling the motor 200. This avoids the possibility that the sampling signal may contain high-frequency components, leading to signal aliasing, loss of key transient information, and affecting the normal feedback operation of the motor. After acquiring the sampling signal V1, it is amplified by the signal amplification unit 20 to obtain an amplified signal V2. The amplified signal V2 refers to the sampled signal V1 after being amplified by the signal amplification unit 20. This amplifies a relatively small signal for subsequent judgment. The signal amplification unit 20 can be a commonly used signal amplification device or circuit, and is not limited here. The amplified signal V2 is then processed by the peak sampling unit 30 to extract the peak value, resulting in a peak signal V3. The peak signal V3 refers to the signal after the peak value is extracted by the peak sampling unit 30. The peak sampling unit 30 can be a commonly used peak extraction circuit or device, and is not limited here. Finally, the peak signal V3 will be transmitted to the motor controller 50 through the signal follower unit 40. At this time, the motor controller 50 will obtain the peak signal V3 of the motor 200 and then control the motor 200 based on the peak signal V3 to ensure the stability and accuracy of the motor 200 control.

[0059] It is worth noting that the signal sampling terminal 210 of the motor 200 can be an output terminal of the motor drive circuit 300 that controls the motor 200. For example, if the motor 200 is a single-phase motor, the output terminal of the motor drive circuit 300 is connected to the motor 200, and the signal sampling terminal 210 is a point on the connection line between the output terminal of the motor drive circuit 300 and the motor 200. If the motor 200 is a three-phase motor, the output terminal of the motor drive circuit 300 is connected to the three-phase input terminal of the motor 200. For different acquisition needs, the signal sampling terminal 210 can be a point on the connection line between the output terminal of the motor drive circuit 300 and any one of the input terminals of the motor 200. The control terminal 220 of motor 200 refers to the port on motor drive circuit 300 that drives motor 200 to work. If motor drive circuit 300 is a single-phase drive circuit, then control terminal 220 of motor 200 is the gate of a set of switching transistors on motor drive circuit 300. If motor drive circuit 300 is a three-phase drive circuit, then control terminal 220 of motor 200 is the gate of three sets of switching transistors on motor drive circuit 300. The motor 200 is controlled by controlling the conduction of the switching transistors. The feedback adjustment at this time is based on the peak signal V3 obtained by motor signal sampling circuit 100. The output power of motor 200 is stably detected based on peak signal V3. At the same time, control based on peak signal V3 can ensure the accuracy of motor 200 control.

[0060] In this embodiment, a motor signal sampling circuit 100 is provided, including a sampling resistor unit 10, the sampling terminal of which is connected to the signal sampling terminal 210 of the motor 200, and the sampling resistor unit 10 is used to acquire the sampling signal V1 of the signal sampling terminal 210; a signal amplification unit 20, the input terminal of which is connected to the sampling terminal, and the signal amplification unit 20 is used to amplify the sampling signal V1 to obtain an amplified signal V1; a peak sampling unit 30, the input terminal of which is connected to the output terminal of the signal amplification unit 20, and the peak sampling unit 30 is used to extract the peak signal V3 of the amplified signal V2; a signal following unit 40, the input terminal of which is connected to the output terminal of the peak sampling unit 30; and a motor controller 50, the input terminal of which is connected to the output terminal of the signal following unit 40, and the output terminal of which is connected to the control terminal 220 of the motor 200. The signal sampling circuit 100 receives the peak signal V3 output by the signal follower unit 40 and controls the motor 200 based on the peak signal V3. This motor signal sampling circuit 100 collects the sampling signal V1 from the signal sampling terminal 210 through the sampling resistor unit 10, processes the sampling signal V1 through the signal amplification unit 20 and the peak sampling unit 30 to obtain the peak signal V3, and then outputs the peak signal V3 to the motor controller 50 through the signal follower unit 40 so that the motor controller 50 controls the motor based on the peak signal V3. This avoids the phenomenon that the voltage division of the sampling resistor cannot accurately reflect the actual situation of the motor. This motor signal sampling circuit 100 can collect the peak signal V3 based on the above circuit and control the motor based on the peak signal V3. It can avoid the problem that the voltage division signal of the resistor (which cannot reflect the voltage peak) cannot accurately reflect the actual situation of the motor. Using the peak signal V3 to control the motor can improve the accuracy of motor control.

[0061] Furthermore, based on the first embodiment of this application described above, a second embodiment of the motor signal sampling circuit of this application is proposed, referring to... Figure 2 , Figure 2 This is a schematic diagram of the circuit connection of the first embodiment of the motor signal sampling circuit of this application. The sampling resistor unit 10 includes:

[0062] The sampling resistor RX has its first end grounded and its second end used as a resistance sampling terminal, which is connected to the signal sampling terminal 210 and the input terminal of the signal amplification unit 20.

[0063] In one embodiment, the signal amplification unit 20 includes:

[0064] The first resistor R1 has its first end serving as the input terminal of the signal amplification unit 20 and connected to the resistor sampling terminal.

[0065] The first operational amplifier chip AP1 has its first input terminal connected to the second terminal of the first resistor R1, and its output terminal serves as the output terminal of the signal amplification unit 20 and is connected to the input terminal of the peak sampling unit 30.

[0066] The second resistor subunit 21 has a first terminal grounded and a second terminal connected to the second input terminal of the first operational amplifier chip AP1.

[0067] The third resistor R3 has its first end connected to the second input terminal of the first operational amplifier chip AP1, and its second end connected to the output terminal of the first operational amplifier chip AP1.

[0068] In this embodiment, the sampling resistor unit 10 includes a sampling resistor RX, which is used to acquire the signal from the signal sampling terminal 210 by voltage division based on the sampling resistor RX. Of course, the sampling resistor unit 10 may also include a voltage divider unit composed of multiple sampling resistors RX to acquire the signal from the signal sampling terminal 210, or other voltage acquisition methods may be used; this is not limited here. Because if the feedback processing is directly performed based on the sampled signal V1 acquired by the sampling resistor unit 10, the sampled signal may contain high-frequency components, leading to signal aliasing, loss of key transient information, and affecting the normal feedback operation of the motor. Therefore, the sampled signal V1 needs to be further processed to ensure the accuracy of the feedback signal, thereby improving the accuracy of the motor 200 control. At this point, the sampled signal V1 needs to be amplified to ensure the effect of subsequent processing. This is achieved through a signal amplification unit 20, which consists of a first resistor R1, a first operational amplifier chip AP1, a second resistor subunit 21, and a third resistor R3. The second resistor subunit 21 and the third resistor R3 together form the hardware amplification factor of the entire signal amplification unit 20. When the second resistor subunit 21 contains only one second resistor R2, the amplification factor of the sampled signal V1 is R30 / R20. In this configuration, R30 is the resistance value of the third resistor R3, and R20 is the resistance value of the second resistor R2. The sampled signal V1 can be amplified by a factor of R30 / R20 before being output to the peak sampling unit 30. This allows the peak sampling unit 30 to extract the peak value of the amplified signal V2, which is then used by the motor controller 50 to receive the peak signal V3 output by the signal following unit 40. Based on the peak signal V3, the motor 200 can be controlled, enabling feedback control and adjustment of the motor 200 using the peak signal, thereby improving the accuracy of motor 200 control. It is worth noting that the first operational amplifier chip AP1 can be a common amplifying operational amplifier, such as the LM358 or LM324, but other amplification devices can also be used; this is not limited here.

[0069] It is worth noting that the signal processed by the entire motor signal sampling circuit 100 can be either a voltage signal or a current signal, and this is not limited here.

[0070] In one embodiment, reference is made to Figure 3 , Figure 3 This is a circuit connection diagram of the second embodiment of the motor signal sampling circuit of this application. The signal amplification unit 20 also includes:

[0071] The peak comparison subunit 60 has its first end connected to the output end of the peak sampling unit 30, its second end connected to the peak threshold signal V3T, and its output end connected to the control end of the second resistor subunit 21. The peak threshold signal V3T is the maximum charging voltage of the first capacitor C1 in the peak sampling unit 30.

[0072] Furthermore, the peak comparison subunit 60 includes:

[0073] The comparison operational amplifier chip AP4 has its first input terminal connected to the output terminal of the peak sampling unit 30, its second input terminal connected to the peak threshold signal V3T, and its output terminal connected to the control terminal of the second resistor subunit 21.

[0074] Furthermore, the second resistive subunit 21 includes:

[0075] The fourth resistor R4, the first end of the fourth resistor R4 serves as the first end of the second resistor subunit 21;

[0076] The fifth resistor R5 is connected to the first end of the fourth resistor R4. The resistance values ​​of the fourth resistor R4 and the fifth resistor R5 are different.

[0077] The turn-on selection device 211 has its first selection terminal connected to the second terminal of the fourth resistor R4 and the second terminal of the fifth resistor R5. The output terminal of the turn-on selection device 211 serves as the second terminal of the second resistor subunit 21 and is connected to the second input terminal of the first operational amplifier chip 211. The control terminal of the turn-on selection device 211 serves as the control terminal of the second resistor subunit 21 and is connected to the output terminal of the comparator operational amplifier chip AP4.

[0078] In this embodiment, in order to ensure the usability of the entire motor signal sampling circuit 100, the resistance value in the second resistor subunit 21 can be adjusted to make it suitable for different scenarios. This is because the principle of the entire motor signal sampling circuit 100 is based on the charging and discharging of the first capacitor C1 to extract the amplitude signal. Since different first capacitors C1 have upper limits for charging and discharging, when the amplitude of the amplified signal V2 itself is greater than the upper limit of the charging of the first capacitor C1, it will cause inaccuracy in the subsequent feedback of the peak signal V3. Therefore, at least two resistors with different resistance values ​​should be designed in the second resistor subunit 21. Resistors with smaller resistance values ​​can be used preferentially to ensure a larger amplification factor. For example, the fourth resistor R4 has a small resistance value. Under normal circumstances, a low level is input through the turn-on selection device 211 to control the connection between the first selection terminal and the output terminal of the turn-on selection device 211, thereby connecting the fourth resistor R4 to the motor signal sampling circuit 100. The fifth resistor R5 is disconnected from the entire motor signal sampling circuit 100. Of course, if the second resistor subunit 21 is only used in one scenario, only one resistor, namely the second resistor R2, can exist. In this case, the second resistor R2 is connected between the second input terminal of the first operational amplifier chip AP1 and ground. It is worth noting that the turn-on selection device 211 can be a conventional two-to-one multiplexer chip, or a corresponding controller can be used for control. When a new signal acquisition instrument is connected to the motor signal sampling circuit 100, if the peak signal V3 is input to the comparator operational amplifier chip AP4 and AP4 outputs a high level, it is determined that the peak signal V3 exceeds the maximum charging voltage of the first capacitor C1 in the peak sampling unit 30. Conversely, if AP4 outputs a low level, it is determined that the peak signal V3 does not exceed the maximum charging voltage of the first capacitor C1 in the peak sampling unit 30. It is preliminarily assumed that the comparator operational amplifier chip AP4 operates on the principle that when the peak signal V3 is less than the peak threshold signal V3T, the output of AP4 outputs a low level. This low level then controls the first selection terminal of the conduction selection device 211 to connect to its output terminal, thereby connecting the fourth resistor R4 to the motor signal sampling circuit 100. Therefore, it can be known that the peak signal V3 does not exceed the maximum charging voltage of the first capacitor C1 in the peak sampling unit 30, and the accuracy of the peak signal V3 can be guaranteed. Conversely, assuming that the principle of the comparator operational amplifier chip AP4 is that when the peak signal V3 is greater than the peak threshold signal V3T, the output terminal of the comparator operational amplifier chip AP4 outputs a high level, and then the second selection terminal of the conduction selection device 211 is connected to the output terminal of the conduction selection device 211 based on the low level, and then the fifth resistor R5 is connected to the motor signal sampling circuit 100 to reduce the amplification factor of the sampled signal V1. At this time, it can be known that the peak signal V3 exceeds the maximum charging voltage of the first capacitor C1 in the peak sampling unit 30. By reducing the amplification factor, the accuracy of the peak signal V3 at this time can be guaranteed.Of course, more resistors with different resistance values ​​can be set for different needs to switch control, so as to ensure the accuracy of the peak signal V3 in the subsequent determination, and thus ensure the accuracy of motor 200 control.

[0079] It is worth noting that the comparator operational amplifier chip AP4 can be a commonly used comparator operational amplifier chip, such as OP07 or AD8551, or other instruments with comparator functions; this is not limited here. The conduction selection device 211 can be a commonly used 2-to-1 digital chip, or it can be used to directly control two switches, such as a switch controlled by high and low levels, or other chips with selection functions.

[0080] In one embodiment, reference is made to Figure 4 , Figure 4 This is a circuit connection diagram of the third embodiment of the motor signal sampling circuit of this application. The peak sampling unit 30 includes:

[0081] The second operational amplifier chip AP2 has its first input terminal serving as the input terminal of the peak sampling unit 30 and connected to the output terminal of the signal amplification unit 20.

[0082] The first diode D1 has its anode connected to the output terminal of the second operational amplifier chip AP2, and its cathode serves as the output terminal of the peak sampling unit 30 and is connected to the input terminal of the signal follower unit 40.

[0083] The first capacitor C1 has its first terminal grounded, and its second terminal is connected to the cathode of the first diode D1 and the second input terminal of the second operational amplifier chip AP2.

[0084] In one embodiment, the signal following unit 40 includes:

[0085] The third operational amplifier chip AP3 has its first input terminal serving as the input terminal of the signal follower unit 40 and connected to the output terminal of the peak sampling unit 30. The second input terminal of the third operational amplifier chip AP3 is connected to the output terminal of the third operational amplifier chip AP3 and then serves as the output terminal of the signal follower unit 40.

[0086] In this embodiment, after determining the amplified signal V2, the peak signal V3 in the amplified signal V2 is extracted based on the peak sampling unit 30. The peak sampling unit 30 consists of a second operational amplifier chip AP2, a first diode D1, and a first capacitor C1. The amplified signal V2 can charge the first capacitor C1. As the voltage on the first capacitor C1 increases, it reaches the peak signal V3. When the amplified signal V2 decreases, the first diode D1 enters a reverse cutoff state, preventing the first capacitor C1 from discharging. The first capacitor C1 then maintains its highest voltage V3 state, thus extracting the peak signal. Of course, to ensure the accuracy of the extracted peak signal, different first capacitors C1 can be selected to adapt to different charging requirements. It is worth noting that the second operational amplifier chip AP2 can be a normal feedback operational amplifier, such as TLV2372 or D8542, or other devices with feedback functions; this is not limited here. Ultimately, the data is transmitted to the motor controller 50 via the third operational amplifier chip AP3. Alternatively, it can be transmitted directly to the motor controller 50. The third operational amplifier chip AP3 can be a voltage follower operational amplifier, such as LM741 or AD8055, or any instrument with voltage follower capabilities; this is not a limitation. Further details can be found in [reference needed]. Figure 5 , Figure 5 This is a schematic diagram of the circuit connection for the fourth embodiment of the motor signal sampling circuit of this application. When the motor 200 and the motor drive circuit 300 are operating under the control of the motor controller 50, such as an MCU, the operating current flows through the sampling resistor RX, generating a sampling signal V1. The sampling signal V1 is amplified by the operational amplifier AP1, with an amplification factor of R30 / R20 (assuming there is only one second resistor R2 at this time). The amplified voltage is the amplified signal V2. The amplified signal V2 passes through the operational amplifier AP2, turning on the first diode D1, and then charging the first capacitor C1. Synchronous negative feedback is given to AP2, forming a negative feedback loop (improving detection accuracy), detecting the peak voltage signal V3. The peak signal V3 then passes through the voltage follower of the operational amplifier AP3 to output a stable voltage signal V4. V4 is received and judged by the MCU, and the maximum output power of the motor is regulated through the motor control path. When the amplified signal V2 is input, it passes through the operational amplifier AP2, turning on the first diode D1, and the current flows to the first capacitor C1 to charge the first capacitor C1. The first capacitor C1 increases continuously as the amplified signal V2 rises until the peak signal V3. When the amplified signal V2 begins to fall, the first diode D1 enters the reverse cutoff state, preventing the first capacitor C1 from discharging. The first capacitor C1 will then maintain its highest voltage, i.e., the peak signal V3 state, to determine the peak information. Then, the motor 200 is controlled based on the peak signal to ensure the accuracy of the motor 200 control.

[0087] It is worth noting that, since the charging capacity of the first capacitor C1 needs to be considered, different first capacitors C1 can be selected based on the actual situation to extract the peak signal. The logic is the same as the logic for selecting the amplification factor above. That is, when it is greater than the maximum charging capacity of the current first capacitor C1, a level is output to control the selection of more capacitors with higher charging capacity, so as to expand the application scenarios of the motor signal sampling circuit 100, while ensuring the accuracy of amplitude signal acquisition, thereby improving the accuracy of motor 200 control.

[0088] Based on an embodiment of the motor signal sampling circuit 100, this application also provides an intelligent massage device, which includes the aforementioned motor signal sampling circuit 100.

[0089] It is worth noting that, according to the intelligent massage device of this utility model embodiment, the intelligent massage device collects the sampling signal V1 from the signal sampling terminal 210 through the sampling resistor unit 10, and processes the sampling signal V1 through the signal amplification unit 20 and the peak sampling unit 30 to obtain the peak signal V3. Then, the peak signal V3 is output to the motor controller 50 through the signal follower unit 40, so that the motor controller 50 controls the motor based on the peak signal V3. This avoids the phenomenon that the voltage division of the sampling resistor cannot accurately reflect the actual situation of the motor. This motor signal sampling circuit 100 can collect the peak signal V3 based on the above circuit and control the motor based on the peak signal V3. It can avoid the problem that the voltage division signal of the resistor (which cannot reflect the voltage peak) cannot accurately reflect the actual situation of the motor. Using the peak signal V3 to control the motor can improve the accuracy of motor control.

[0090] This application provides a novel motor signal sampling circuit for an intelligent massage device (which can also be used for other devices requiring motor signal sampling) to improve the accuracy of motor control. Compared to the prior art, the beneficial effects of the device provided in this application are the same as those of the motor signal sampling circuit provided in the above embodiments, and will not be repeated here.

[0091] Furthermore, based on the first embodiment of this application described above, a second embodiment of the intelligent massage device of this application is proposed, referring to... Figure 6 , Figure 6 This is a circuit connection diagram of the first embodiment of the intelligent massage device of this application. The intelligent massage device also includes:

[0092] Motor 200;

[0093] The motor drive circuit 300 has its power supply terminal connected to the motor power supply VCC. The first terminal of the motor drive circuit 300 is connected to the motor 200. The second terminal of the motor drive circuit 300 serves as the signal sampling terminal 210 of the motor 200 and is connected to the resistor sampling terminal in the motor signal sampling circuit 100. The third terminal of the motor drive circuit 300 is connected to the motor controller 50 in the motor signal sampling circuit 100.

[0094] In this embodiment, the intelligent massage device also includes a motor 200 and a motor drive circuit 300. The power supply terminal of the motor drive circuit 300 is connected to the motor power supply VCC to provide power for driving the motor 200. The motor drive circuit 300 can be a common single-phase or three-phase bridge arm drive circuit. Assuming that the motor 200 is a three-phase motor, the output terminal of the motor drive circuit 300 is connected to the three-phase input terminal of the motor 200. Then, for different acquisition needs, the signal sampling terminal 210 is a point on the connection line between the output terminal of the motor drive circuit 300 and any one of the input terminals of the motor 200. The control terminal 220 of motor 200 refers to the port on motor drive circuit 300 that drives motor 200 to work. If motor drive circuit 300 is a single-phase drive circuit, then control terminal 220 of motor 200 is the gate of a set of switching transistors on motor drive circuit 300. If motor drive circuit 300 is a three-phase drive circuit, then control terminal 220 of motor 200 is the gate of three sets of switching transistors on motor drive circuit 300. Control of motor 200 is achieved by controlling the conduction of the switching transistors. Of course, other types of motor drive circuit 300 can also be used, which are not limited here. In this case, motor 200 can be controlled based on peak signals to ensure the accuracy of motor 200 control.

[0095] It is worth noting that smart massage devices may also include other hardware, such as massage components and external genuine leather encapsulation, which will not be described in detail here.

[0096] The above are only some embodiments of this application and do not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A motor signal sampling circuit, characterized in that, The motor signal sampling circuit includes: A sampling resistor unit, wherein the resistor sampling terminal of the sampling resistor unit is connected to the signal sampling terminal of the motor, and the sampling resistor unit is used to collect the sampling signal of the signal sampling terminal; A signal amplification unit, wherein the input terminal of the signal amplification unit is connected to the resistor sampling terminal, and the signal amplification unit is used to amplify the sampled signal to obtain an amplified signal; A peak sampling unit, the input of which is connected to the output of the signal amplification unit, is used to extract the peak signal of the amplified signal; A signal follower unit, wherein the input terminal of the signal follower unit is connected to the output terminal of the peak sampling unit, and the signal follower unit is used to output the peak signal; A motor controller, wherein the input terminal of the motor controller is connected to the output terminal of the signal following unit, and the output terminal of the motor controller is connected to the control terminal of the motor, and the motor controller is used to receive the peak signal output by the signal following unit in order to control the motor based on the peak signal.

2. The motor signal sampling circuit as described in claim 1, characterized in that, The sampling resistor unit includes: A sampling resistor, the first end of which is grounded, and the second end of which serves as the resistor sampling terminal and is connected to the signal sampling terminal and the input terminal of the signal amplification unit.

3. The motor signal sampling circuit as described in claim 1, characterized in that, The signal amplification unit includes: The first resistor, the first end of which serves as the input terminal of the signal amplification unit and is connected to the resistor sampling terminal; The first operational amplifier chip has its first input terminal connected to the second terminal of the first resistor, and its output terminal serves as the output terminal of the signal amplification unit and is connected to the input terminal of the peak sampling unit. The second resistor subunit has a first terminal grounded and a second terminal connected to the second input terminal of the first operational amplifier chip. The third resistor has its first end connected to the second input terminal of the first operational amplifier chip, and its second end connected to the output terminal of the first operational amplifier chip.

4. The motor signal sampling circuit as described in claim 3, characterized in that, The signal amplification unit further includes: A peak comparison subunit is provided, wherein the first end of the peak comparison subunit is connected to the output end of the peak sampling unit, the second end of the peak comparison subunit is connected to a peak threshold signal, and the output end of the peak comparison subunit is connected to the control end of the second resistor subunit, wherein the peak threshold signal is the maximum charging voltage of the first capacitor in the peak sampling unit.

5. The motor signal sampling circuit as described in claim 4, characterized in that, The peak comparison subunit includes: The comparison operational amplifier chip has its first input terminal connected to the output terminal of the peak sampling unit, its second input terminal connected to the peak threshold signal, and its output terminal connected to the control terminal of the second resistor subunit.

6. The motor signal sampling circuit as described in claim 5, characterized in that, The second resistive sub-unit includes: The fourth resistor, the first end of which serves as the first end of the second resistor subunit; A fifth resistor, the first end of which is connected to the first end of the fourth resistor, wherein the resistance values ​​of the fourth resistor and the fifth resistor are different; A selector is provided, wherein the first selector terminal of the selector is connected to the second terminal of the fourth resistor, the first selector terminal of the selector is connected to the second terminal of the fifth resistor, the output terminal of the selector serves as the second terminal of the second resistor subunit and is connected to the second input terminal of the first operational amplifier chip, and the control terminal of the selector serves as the control terminal of the second resistor subunit and is connected to the output terminal of the comparator operational amplifier chip.

7. The motor signal sampling circuit as described in claim 1, characterized in that, The peak sampling unit includes: The second operational amplifier chip has its first input terminal serving as the input terminal of the peak sampling unit and connected to the output terminal of the signal amplification unit. The first diode has its anode connected to the output terminal of the second operational amplifier chip, and its cathode serves as the output terminal of the peak sampling unit and is connected to the input terminal of the signal follower unit. The first capacitor has its first terminal grounded, and its second terminal is connected to the cathode of the first diode and the second input terminal of the second operational amplifier chip.

8. The motor signal sampling circuit as described in claim 1, characterized in that, The signal following unit includes: The third operational amplifier chip has its first input terminal serving as the input terminal of the signal follower unit and connected to the output terminal of the peak sampling unit. The second input terminal of the third operational amplifier chip is connected to the output terminal of the third operational amplifier chip and then serves as the output terminal of the signal follower unit.

9. A smart massage device, characterized in that, The intelligent massage device includes a motor signal sampling circuit as described in any one of claims 1 to 8.

10. The intelligent massage device as described in claim 9, characterized in that, The intelligent massage device also includes: Electric motor; The motor drive circuit has a power supply terminal connected to the motor power supply, a first terminal connected to the motor, a second terminal serving as the signal sampling terminal of the motor and connected to the resistor sampling terminal in the motor signal sampling circuit, and a third terminal connected to the motor controller in the motor signal sampling circuit.

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