Transmission system resistance compensation circuit and strength training equipment

Abstract

The invention discloses a transmission system resistance compensation circuit and strength training equipment. The transmission system resistance compensation circuit comprises an acquisition module and a main control module, the acquisition module is used for being connected with a transmission system, and is used for acquiring a first deformation signal output when the transmission system is in a no-load state and a second deformation signal output when the transmission system is in a load state; the main control module is connected with the acquisition module, the main control module is used for being connected with the driving mechanism, the driving mechanism is used for being connected with a strength training terminal, and the main control module is used for calibrating the second deformation signal according to the difference between the first deformation signal and the second deformation signal, generating a calibrated control signal and sending the calibrated control signal to the acquisition module. The calibrated control signal is used for controlling the driving mechanism to drive the strength training terminal to output target resistance. The transmission system resistance compensation circuit provided by the invention can dynamically adjust the resistance generated by different strength trainings, and the sense of reality of use of a user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit design, and particularly to a transmission system resistance compensation circuit and a strength training device. Background Art

[0002] Strength training devices usually help trainers perform various strength training movements by providing resistance or weight. The transmission system of a strength training device is a device that transmits the power and motion of a power machine to an execution system.

[0003] Currently, in a conventional strength training transmission system, the power output by a driving mechanism is transmitted to a strength training terminal. Due to certain energy losses from the control of the driving mechanism to the strength training terminal, the force generated by the strength training terminal is not precise enough. Summary of the Invention

[0004] The present invention provides a transmission system resistance compensation circuit and a strength training device to solve the problem that the force generated by a strength training terminal in the prior art is not precise enough.

[0005] According to one aspect of the present invention, a transmission system resistance compensation circuit is provided, which includes an acquisition module and a main control module;

[0006] The acquisition module is used to connect to the transmission system, and the acquisition module is used to acquire a first deformation signal output by the transmission system when it is unloaded and a second deformation signal output by the transmission system when it is loaded;

[0007] The main control module is connected to the acquisition module. The main control module is used to connect to a driving mechanism, and the driving mechanism is used to connect to a strength training terminal. The main control module is used to calibrate the second deformation signal according to the difference between the first deformation signal and the second deformation signal, generate a calibrated control signal, and the calibrated control signal is used to control the driving mechanism to drive the strength training terminal to output a target resistance.

[0008] Optionally, the main control module includes an ADC sampling unit, and the ADC sampling unit is used to perform real-time sampling on the first deformation signal and the second deformation signal.

[0009] Optionally, the transmission system resistance compensation circuit further includes an amplification module, and the amplification module is connected between the output end of the acquisition module and the input end of the main control module. The amplification module is used to perform amplification processing on the first deformation signal and the second deformation signal.

[0010] Optionally, the amplification module includes an instrumentation amplifier and a first resistor. Both ends of the first resistor are connected to the instrumentation amplifier. The positive input terminal of the instrumentation amplifier is connected to the first output terminal of the acquisition module, the negative input terminal of the instrumentation amplifier is connected to the second output terminal of the acquisition module, and the output terminal of the instrumentation amplifier is connected to the output terminal of the amplification module. The instrumentation amplifier is used to perform differential amplification on the first deformation signal and the second deformation signal, and the first resistor is used to adjust the amplification factor of the instrumentation amplifier.

[0011] Optionally, the drive system resistance compensation circuit further includes a bias module. The bias module is used to connect to the amplification module and provide a bias signal to make the signal output by the amplification module within a preset range.

[0012] Optionally, the bias module includes a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, and an operational amplifier. The first end of the second resistor is connected to the first power supply terminal, the second end of the second resistor is connected to the first end of the third resistor, the first end of the first capacitor, and the positive input terminal of the operational amplifier. The negative input terminal of the operational amplifier is connected to the output terminal of the operational amplifier and the first end of the fourth resistor. The second end of the fourth resistor is connected to the output terminal of the bias module. The power supply terminal of the operational amplifier is connected to the first power supply terminal and the first end of the second capacitor. The second end of the second capacitor, the ground terminal of the operational amplifier, the second end of the third resistor, and the second end of the first capacitor are grounded.

[0013] Optionally, the drive system resistance compensation circuit further includes a voltage-to-current conversion module. The voltage-to-current conversion module is used to connect to the main control module and the drive mechanism, and convert the input voltage signal into a current signal and transmit the current signal to the drive mechanism.

[0014] Optionally, the voltage-to-current conversion module includes a voltage-to-current converter and a first transistor. The input terminal of the voltage-to-current converter is connected to the input terminal of the voltage-to-current conversion module, the output terminal of the voltage-to-current converter is connected to the first end of the first transistor, the control terminal of the voltage-to-current converter is connected to the control terminal of the first transistor, and the second end of the first transistor is connected to the drive mechanism. The voltage-to-current converter is used to convert the input voltage signal into a current signal, and the first transistor is used to conduct or cut off according to the control signal output by the control terminal of the voltage-to-current converter and transmit the current signal output by the voltage-to-current converter to the drive mechanism when conducting.

[0015] Optionally, the drive system resistance compensation circuit further includes a status indication module, which is connected to the main control module and is used to display the status of the main control module according to the indication signal output by the main control module.

[0016] According to another aspect of the present invention, a strength training device is provided, which includes a driving mechanism, a strength training terminal, and the drive system resistance compensation circuit.

[0017] The technical solution of the embodiment of the present invention provides a drive system resistance compensation circuit, which includes an acquisition module, an amplification module, a bias module, and a main control module; the acquisition module acquires a first deformation signal output by the drive system when it is unloaded and a second deformation signal output by the drive system when it is loaded. The main control module calibrates the second deformation signal according to the difference between the first deformation signal and the second deformation signal to generate a calibrated control signal, and the calibrated control signal is used to control the driving mechanism to drive the strength training terminal to output a target resistance. Since the first deformation signal is the deformation signal generated when the drive system is unloaded, that is, when the drive system is not subjected to force, deformation may be caused by environmental factors, its own losses, etc. By calibrating the second deformation signal by the main control module according to the difference between the first deformation signal and the second deformation signal, the error caused by environmental influence, its own losses and other factors of the drive system can be eliminated, the accuracy of the resistance output by the strength training terminal is improved, the user's sense of reality is improved, and the problem that the force generated by the strength training terminal in the prior art is not accurate enough is solved.

[0018] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is a schematic structural diagram of a drive system resistance compensation circuit provided by an embodiment of the present invention;

[0021] Figure 2 is a circuit diagram of a drive system resistance compensation circuit provided by an embodiment of the present invention;

[0022] Figure 3 is a circuit diagram of another drive system resistance compensation circuit provided by an embodiment of the present invention;

[0023] Figure 4 It is a schematic structural diagram of the strength training device provided by an embodiment of the present invention. Detailed implementation manners

[0024] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily need to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0026] An embodiment of the present invention provides a transmission system resistance compensation circuit. Figure 1 It is a schematic structural diagram of a transmission system resistance compensation circuit provided by an embodiment of the present invention. As Figure 1 shown, the transmission system resistance compensation circuit 100 includes an acquisition module 110 and a main control module 120; the acquisition module 110 is used to connect to the transmission system, and the acquisition module 110 is used to acquire a first deformation signal output by the transmission system under no-load conditions and a second deformation signal output by the transmission system under loaded conditions. The main control module 120 is connected to the acquisition module 110, the main control module 120 is used to connect to a driving mechanism, the driving mechanism is used to connect to a strength training terminal, and the main control module 120 is used to calibrate the second deformation signal according to the difference between the first deformation signal and the second deformation signal to generate a calibrated control signal, and the calibrated control signal is used to control the driving mechanism to drive the strength training terminal to output a target resistance.

[0027] In the embodiments of the present invention, no-load refers to the state of the transmission system when it is not subject to external forces. The first deformation signal refers to the deformation signal generated by the transmission system in the no-load state. For example, the transmission system deforms due to factors such as external environmental influence and its own loss in the no-load state. Loaded refers to the state of the transmission system when it is subject to external forces. The second deformation signal refers to the deformation signal of the transmission system in the loaded state. Among them, the first deformation signal can be an electrical signal representing the amount of deformation generated by the transmission system in the no-load state, and the second deformation signal can be an electrical signal representing the amount of deformation generated by the transmission system in the loaded state.

[0028] The transmission system resistance compensation circuit 100 is an auxiliary circuit for correcting or improving the performance of the transmission system, which can offset or reduce the influence of environmental impact, its own loss, etc. in the transmission system. The acquisition module 110 is a module for acquiring physical parameters of the transmission system in no-load or loaded state. For example, the acquisition module 110 includes sensors, etc., and the acquisition module 110 can be used to acquire the amount of deformation of the transmission system. The main control module 120 refers to the module responsible for monitoring, managing, and controlling in the system. The main control module 120 can receive input signals, process information, and adjust the operating state of the system according to the internal control program.

[0029] In the embodiments of the present invention, the acquisition module 110 acquires the first deformation signal of the transmission system in no-load state and the second deformation signal of the transmission system in loaded state. The main control module 120 first obtains the first deformation signal in the no-load state, and then corrects the second deformation signal according to the difference between the first deformation signal in the no-load state and the second deformation signal of the transmission system in loaded state. For example, the correction process includes subtracting the second deformation signal from the first deformation signal to generate a calibrated control signal. The calibrated control signal controls the driving mechanism to drive the strength training terminal to output the target resistance, which can eliminate the errors generated by the transmission system due to factors such as environmental impact and its own loss, improve the accuracy of the resistance output by the strength training terminal, and enhance the user's sense of reality.

[0030] The technical solution of the embodiment of the present invention provides a transmission system resistance compensation circuit. The acquisition module 110 acquires a first deformation signal output by the transmission system when it is unloaded and a second deformation signal output by the transmission system when it is loaded. The main control module 120 calibrates the second deformation signal according to the difference between the first deformation signal and the second deformation signal to generate a calibrated control signal, and the calibrated control signal is used to control the driving mechanism to drive the strength training terminal to output the target resistance. Since the first deformation signal is the deformation signal generated when the transmission system is unloaded, that is, when the transmission system is not subjected to force, deformation may be caused by environmental factors, its own losses, etc. By calibrating the second deformation signal by the main control module 120 according to the difference between the first deformation signal and the second deformation signal, the error generated by the transmission system due to environmental influence, its own losses and other factors can be eliminated, the accuracy of the resistance output by the strength training terminal is improved, the user's sense of reality in use is improved, and the problem that the force generated by the strength training terminal in the prior art is not accurate enough is solved.

[0031] On the basis of the above embodiment, the main control module 120 includes an ADC (Analog-to-Digital Converter) sampling unit. The ADC sampling unit is a unit that converts an analog signal into a digital signal. The ADC sampling unit is connected to the acquisition module 110. The ADC sampling unit is used to perform real-time sampling on the first deformation signal and the second deformation signal output by the acquisition module 110, and output a first digital signal corresponding to the first deformation signal and a second digital signal corresponding to the second deformation signal. The ADC sampling unit is also connected to a processor inside the main control module. The processor corrects the second digital signal according to the difference between the first digital signal and the second digital signal. For example, the ADC sampling unit includes an analog-to-digital converter and samples 1000 times per second to achieve real-time sampling of the first deformation signal and the second deformation signal.

[0032] In addition, the main control module 120 further includes a DAC (Digital-to-Analog Converter) conversion unit. The DAC conversion unit is connected to the processor. The DAC conversion unit converts the calibrated second digital signal output by the processor into an analog signal. The DAC conversion unit is also connected to the driving mechanism. The DAC conversion unit transmits the analog signal to the driving mechanism, where the analog signal output by the DAC conversion unit is the calibrated control signal. For example, the DAC conversion unit includes a digital-to-analog converter, and its working frequency can reach 1KHz to achieve real-time output of the calibrated control signal.

[0033] Figure 2 is the circuit diagram of a transmission system resistance compensation circuit provided by the embodiment of the present invention, as Figure 2As shown in the figure, the acquisition module 110 includes a sensor unit 111 and a bridge circuit unit 112. The sensor unit 111 is connected to the transmission system, and the bridge circuit unit 112 is connected to the sensor unit 111. Both the first deformation signal and the second deformation signal output by the sensor unit 111 are voltage signals, and the bridge circuit unit 112 is used to amplify the voltage signals output by the sensor unit 111.

[0034] In the embodiment of the present invention, the sensor unit 111 is a unit that converts the measured signal into a corresponding output signal, and the sensor unit 111 includes sensors. The bridge circuit unit 112 is a unit including a bridge circuit. When the resistance in the bridge arm connected to the sensor changes slightly, the unbalanced voltage output by the bridge will amplify the slight change according to a certain proportional relationship. Compared with directly measuring the change in the sensor resistance, the change in the voltage signal output by the bridge circuit is more obvious. At the same time, the bridge circuit has good common-mode rejection ability, can effectively suppress common-mode interference, and only processes and amplifies the differential-mode part of the sensor output signal, thereby improving the accuracy of the measurement result and making the measurement data more truly reflect the actual measured situation.

[0035] In addition, due to the change of the sensor's own characteristics or environmental factors, there may be certain errors such as zero drift and sensitivity change. For example, in a strain gauge sensor, the resistance of the strain gauge may change additionally due to temperature change, resulting in measurement errors. In the bridge circuit, these errors can be compensated by reasonably selecting the bridge arm components, so that the finally output signal more accurately corresponds to the measured physical quantity and reduces the measurement deviation caused by various interference and error factors. Among them, the bridge circuit unit 112 includes a full-bridge circuit, a half-bridge circuit, etc.

[0036] Exemplarily, the sensor unit 111 includes a first sensor T1 and a second sensor T2. The bridge circuit unit 112 includes a first interface J1, a second interface J2, a third capacitor C3, a fourth capacitor C4, a fifth resistor R5, and a sixth resistor R6. The first interface J1 is connected to the first sensor T1, the second interface J2 is connected to the second sensor T2. The first end of the third capacitor C3 is connected to the first end of the first interface J1, the fourth end of the first interface J1, the first power supply terminal V1, and the first end of the fifth resistor R5. The second end of the third capacitor C3 is connected to the second end of the first interface J1, the third end of the first interface J1, and the first output terminal of the bridge circuit unit 112. The second end of the fifth resistor R5 is connected to the second output terminal of the bridge circuit unit 112 and the first end of the sixth resistor R6. The first end of the fourth capacitor C4 is connected to the first end of the second interface J2, the fourth end of the second interface J2, and the first output terminal of the bridge circuit unit 112. The second end of the fourth capacitor C4, the second end of the second interface J2, the third end of the second interface J2, and the second end of the sixth resistor R6 are grounded.

[0037] In an embodiment of the present invention, the first sensor T1 and the second sensor T2 are strain sensors. For example, strain gauges are used. The first sensor T1 and the second sensor T2 are installed on the drive system and are respectively connected to the first interface J1 and the second interface J2. The circuit structure of the bridge circuit unit 112 is a half-bridge circuit. When the drive system deforms, electrical parameters such as the resistance of the sensors will change accordingly. After being connected to the half-bridge circuit, the output voltage of the half-bridge circuit will change. For example, when measuring the minute deformation of the drive system, the half-bridge circuit has the function of differential measurement, and the difference between the two output signals can more accurately reflect the actual strain situation. Especially when there are external interference factors (such as temperature changes, electromagnetic interference, etc.), the two signals are affected by interference in the same way. Therefore, the difference between the two signals can largely cancel the common-mode interference, reduce errors, and improve the measurement accuracy.

[0038] Continue to refer to Figure 2 , the drive system resistance compensation circuit further includes an amplification module 210. The amplification module 210 is connected between the output end of the acquisition module 110 and the input end of the main control module 120. The amplification module 210 is used to amplify the first deformation signal and the second deformation signal. Among them, the amplification module 210 is a module that amplifies the input signal. For example, the amplification module 210 can perform differential amplification on the input signal.

[0039] Specifically, the amplification module 210 includes an instrumentation amplifier U1 and a first resistor R1. Both ends of the first resistor R1 are connected to the instrumentation amplifier U1. The positive input end of the instrumentation amplifier U1 is connected to the first output end of the acquisition module 110, and the negative input end of the instrumentation amplifier U1 is connected to the second output end of the acquisition module. The output end of the instrumentation amplifier U1 is connected to the output end of the amplification module 210. The instrumentation amplifier U1 is used to perform differential amplification on the first deformation signal and the second deformation signal, and the first resistor R1 is used to adjust the amplification factor of the instrumentation amplifier.

[0040] In an embodiment of the present invention, the amplification module 210 further includes a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, an eleventh resistor R11, and a second diode D3. Among them, the fifteenth capacitor C15 and the eleventh resistor R11 constitute an RC filter. The second diode D3 can be a Schottky diode. The first end of the fourteenth capacitor C14 is connected to the first end of the thirteenth capacitor C13, the power supply end of the instrumentation amplifier, and the second power supply terminal V2. The second end of the fourteenth capacitor C14, the second end of the thirteenth capacitor C13, and the ground terminal of the instrumentation amplifier are grounded.

[0041] Based on the above embodiments, the first deformation signal includes two voltage signals output by the acquisition module 110, and the second deformation signal includes two voltage signals output by the acquisition module 110. The instrumentation amplifier U1 performs differential amplification processing on the two input voltage signals. The instrumentation amplifier has a very high open-loop gain and can greatly amplify tiny input differential voltage signals. At the same time, the instrumentation amplifier U1 can flexibly and precisely adjust the gain by externally connecting the first resistor R1. For example, it can set an appropriate amplification factor as needed according to the specific signal input amplitude and subsequent processing requirements, ensuring that the signal is fully amplified without distortion due to excessive amplification, thus guaranteeing the accuracy and effectiveness of signal amplification.

[0042] Continuing to refer to Figure 2 , the transmission system resistance compensation circuit further includes a bias module 220. The bias module 220 is used to connect to the amplification module 210 and provide a bias signal to make the signal output by the amplification module 210 within a preset range. The bias module 220 is a module that provides a bias current or voltage. By providing a stable DC voltage or current, the bias module 220 can ensure that the amplification module 210 operates under appropriate bias conditions. The bias module 220 provides a bias voltage to make the electrical signal output by the amplification module 210 within a preset range, meeting the subsequent processing requirements and ensuring the stability and reliability of the system.

[0043] Specifically, the bias module 220 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a second capacitor C2, and an operational amplifier U2. The first end of the second resistor R2 is connected to the first power supply terminal V1. The second end of the second resistor R2 is connected to the first end of the third resistor R3, the first end of the first capacitor C1, and the non-inverting input terminal IN+ of the operational amplifier U2. The inverting input terminal IN- of the operational amplifier U2 is connected to the output terminal OUT of the operational amplifier U2 and the first end of the fourth resistor R4. The second end of the fourth resistor R4 is connected to the output terminal of the bias module 220. The power supply terminal VDD of the operational amplifier U2 is connected to the first power supply terminal V1 and the first end of the second capacitor C2. The second end of the second capacitor C2, the ground terminal VSS of the operational amplifier U2, the second end of the third resistor R3, and the second end of the first capacitor C1 are grounded.

[0044] Based on the above embodiments, the voltage of the first power supply terminal V1 is divided by the second resistor R2 and the third resistor R3 and then transmitted to the non-inverting input terminal of the operational amplifier U2. The operational amplifier U2 amplifies the input signal and then transmits it to the instrumentation amplifier U1 through the output terminal to provide a bias voltage for the instrumentation amplifier U1. The instrumentation amplifier U1 corrects the output signal according to the bias voltage, making the electrical signal output by the amplification module 210 within a preset range, capable of meeting the subsequent processing requirements and ensuring the stability and reliability of the system.

[0045] Figure 3 is a circuit diagram of another transmission system resistance compensation circuit provided by an embodiment of the present invention. As Figure 3 shown, the transmission system resistance compensation circuit 100 further includes a voltage-current conversion module 230. The voltage-current conversion module 230 is connected to the main control module 120 and the driving mechanism. The voltage-current conversion module 230 is configured to convert an input voltage signal into a current signal and transmit the current signal to the driving mechanism.

[0046] In an embodiment of the present invention, the voltage-current conversion module 230 is a module that converts an input voltage signal into a current signal according to a certain conversion ratio. Specifically, the voltage-current conversion module 230 includes a voltage-current converter U3 and a first transistor Q1. The input terminal of the voltage-current converter U3 is connected to the input terminal of the voltage-current conversion module 230. The output terminal of the voltage-current converter U3 is connected to the first end of the first transistor Q1. The control terminal of the voltage-current converter U3 is connected to the control terminal of the first transistor Q1. The second end of the first transistor Q1 is connected to the driving mechanism. The voltage-current converter U3 is configured to convert an input voltage signal into a current signal. The first transistor Q1 is configured to conduct or turn off according to a control signal output from the control terminal of the voltage-current converter U3 and transmit the current signal output by the voltage-current converter U3 to the driving mechanism when conducting.

[0047] In an embodiment of the present invention, the voltage-current converter U3 includes pins VIN, SET, EP, GND, 0D, VG, IS, and VSP. Among them, the pin VIN serves as the input terminal of the voltage-current converter U3, the pin VG serves as the control terminal of the voltage-current converter U3, and the pin IS serves as the output terminal of the voltage-current converter U3.

[0048] Based on the above embodiment, the voltage-current conversion module 210 further includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a first diode D2, and a third interface J3. The third interface J3 is connected to the driving mechanism. The voltage-current converter U3 converts an input voltage signal into a current signal, and the current signal is transmitted to the driving mechanism through the third interface J3. Since current transmission is more stable than voltage transmission, converting the voltage signal into a current signal through the voltage-current converter U3 can improve the anti-interference ability during signal transmission and reduce the interference caused by the operation of the driving mechanism.

[0049] Continue to refer to Figure 3, the drive system resistance compensation circuit 100 further includes a status indication module 240. The status indication module 240 is connected to the main control module 120, and the status indication module 240 is configured to display the status of the main control module 120 according to the control signal output by the main control module 120.

[0050] In the embodiment of the present invention, the status indication module 240 is a module for displaying the working status of the main control module 120. For example, the working status of the main control module 120 includes zero position calibration and real-time resistance calibration. Among them, the zero position calibration status refers to the working status in which the main control module 120 detects the first deformation signal output when the drive system is no-load. The real-time resistance calibration status refers to the working status in which the main control module 120 calibrates the second deformation signal according to the difference between the first deformation signal and the second deformation signal.

[0051] Specifically, the status indication module 220 includes a seventh resistor R7 and a light-emitting diode D1. The first end of the seventh resistor R7 is connected to the main control module 120, the second end of the seventh resistor R7 is connected to the first end of the light-emitting diode D1, and the second end of the light-emitting diode D1 is grounded. The microcontroller U4 outputs a status signal through the pin PB1. For example, when the main control module 120 is in the zero position calibration working status, the status signal is at a low level and the light-emitting diode D1 is not lit. When the main control module 120 is in the real-time resistance calibration working status, the status signal is at a high level and the light-emitting diode D1 is lit.

[0052] Based on the above embodiment, the main control module 120 includes a microcontroller U4, a tenth capacitor C10, an eleventh capacitor C11, and a twelfth capacitor C12. The microcontroller U4 includes a pin VDDA, a pin PA1, a pin PA2, a pin PB1, and a pin VDDA. Among them, the pin PA1 is used as an input terminal to access the first deformation signal and the second deformation signal, the pin PA2 is used as an output terminal to output the calibrated control signal, and the pin PB1 is used as a status indication terminal to output the status signal.

[0053] In an embodiment of the present invention, the acquisition module 110 acquires a first deformation signal output when the drive system is unloaded and a second deformation signal output when the drive system is loaded. The amplification module 210 performs differential amplification on the first deformation signal and the second deformation signal. The bias module 220 provides a bias voltage so that the electrical signal output by the amplification module is within a preset range to meet the subsequent processing requirements. The main control module 120 first acquires the first deformation signal in the unloaded state, then corrects the second deformation signal according to the difference between the first deformation signal in the unloaded state and the second deformation signal output when the drive system is loaded, and outputs the corrected control signal to the drive mechanism. By adding a voltage-current conversion module between the main control module 120 and the drive mechanism, the voltage transmission is converted into current transmission. The controller inside the drive mechanism converts the received current signal into a voltage signal to drive the drive mechanism to operate, thereby controlling the strength training terminal, improving the accuracy of the output force of the strength training terminal, enhancing the user's sense of reality, and eliminating errors caused by factors such as belt aging of the drive system, bearing lubrication failure, and metal deformation caused by temperature changes.

[0054] An embodiment of the present invention further provides a strength training device. Figure 4 is a schematic structural diagram of the strength training device provided by the embodiment of the present invention, as Figure 4 shown, the strength training device 10 includes a drive mechanism 310, a strength training terminal 320, a drive system 330, and the drive system resistance compensation circuit 100 provided in any of the above embodiments.

[0055] In an embodiment of the present invention, the drive mechanism 310 is the power source of the entire device, and the strength training terminal 320 is the component that the trainer directly contacts and operates. It is connected to the drive mechanism 310 through the drive system 330, and the trainer feels the resistance transmitted by the drive mechanism through the drive system. For example, the strength training terminal 320 includes an adjustable grip, a handle, etc., and can output variable resistance for the user to perform resistance training. The drive system 330 is a device for transmitting power, and includes components such as a conveyor belt and bearings.

[0056] In traditional strength training devices, the traditional system transmits the power output by the drive mechanism to the strength training terminal. Due to factors such as belt aging of the drive system, bearing lubrication failure, and metal deformation caused by temperature changes, there is a deviation between the resistance finally transmitted to the strength training terminal and the resistance output by the drive mechanism. In an embodiment of the present invention, the drive system resistance compensation circuit 100 acquires the deformation parameters of the drive system in real time and calibrates the actual resistance. For example, the frequency of real-time data sampling and compensation signal output of the drive system resistance compensation circuit 100 can reach 1000 times per second. The drive mechanism simulates the resistance curve of strength training according to the signal output by the drive system resistance compensation circuit 100, dynamically adjusts the resistance generated by different strength trainings, and improves the accuracy of the output force of the strength training terminal.

[0057] It should be understood that the various forms of processes shown above can be used, with steps reordered, added or deleted. For example, the steps described in the present invention can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is imposed herein.

[0058] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A transmission system resistance compensation circuit, characterized in that, It includes a collection module and a main control module; The collection module is used to connect to the transmission system. The collection module is used to collect the first deformation signal output by the transmission system under no-load conditions and the second deformation signal output by the transmission system under load conditions; The main control module is connected to the collection module. The main control module is used to connect to the driving mechanism. The driving mechanism is used to connect to the strength training terminal. The main control module is used to calibrate the second deformation signal according to the difference between the first deformation signal and the second deformation signal to generate a calibrated control signal. The calibrated control signal is used to control the driving mechanism to drive the strength training terminal to output a target resistance.

2. The transmission system resistance compensation circuit according to claim 1, wherein The main control module includes an ADC sampling unit. The ADC sampling unit is used to perform real-time sampling on the first deformation signal and the second deformation signal.

3. The transmission system resistance compensation circuit according to claim 1, characterized in that, It also includes an amplification module. The amplification module is connected between the output end of the collection module and the input end of the main control module. The amplification module is used to perform amplification processing on the first deformation signal and the second deformation signal.

4. The drive system resistance compensation circuit according to claim 3, wherein The amplification module includes an instrumentation amplifier and a first resistor. The two ends of the first resistor are connected to the instrumentation amplifier. The positive input terminal of the instrumentation amplifier is connected to the first output terminal of the collection module. The negative input terminal of the instrumentation amplifier is connected to the second output terminal of the collection module. The output terminal of the instrumentation amplifier is connected to the output end of the amplification module. The instrumentation amplifier is used to perform differential amplification on the first deformation signal and the second deformation signal for amplification processing. The first resistor is used to adjust the amplification factor of the instrumentation amplifier.

5. The drive system resistance compensation circuit according to claim 3, characterized in that It also includes a bias module. The bias module is used to connect to the amplification module. The bias module is used to provide a bias signal so that the signal output by the amplification module is within a preset range.

6. The drive system resistance compensation circuit according to claim 5, characterized in that The bias module includes a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, and an operational amplifier. The first end of the second resistor is connected to the first power supply terminal. The second end of the second resistor is connected to the first end of the third resistor, the first end of the first capacitor, and the positive input terminal of the operational amplifier. The negative input terminal of the operational amplifier is connected to the output terminal of the operational amplifier and the first end of the fourth resistor. The second end of the fourth resistor is connected to the output end of the bias module. The power supply terminal of the operational amplifier is connected to the first power supply terminal and the first end of the second capacitor. The second end of the second capacitor, the ground terminal of the operational amplifier, the second end of the third resistor, and the second end of the first capacitor are grounded.

7. The drive system resistance compensation circuit according to claim 1, wherein, It also includes a voltage-current conversion module. The voltage-current conversion module is used to connect to the main control module and the driving mechanism. The voltage-current conversion module is used to convert the input voltage signal into a current signal and transmit the current signal to the driving mechanism.

8. The drive system resistance compensation circuit according to claim 7, wherein, The voltage-current conversion module includes a voltage-current converter and a first transistor. The input end of the voltage-current converter is connected to the input end of the voltage-current conversion module. The output end of the voltage-current converter is connected to the first end of the first transistor. The control end of the voltage-current converter is connected to the control end of the first transistor. The second end of the first transistor is connected to the driving mechanism. The voltage-current converter is used to convert the input voltage signal into a current signal. The first transistor is used to conduct or cut off according to the control signal output from the control end of the voltage-current converter, and transmit the current signal output by the voltage-current converter to the driving mechanism when conducting.

9. The drive system resistance compensation circuit according to claim 1, characterized in that It further includes a status indication module. The status indication module is connected to the main control module. The status indication module is used to display the status of the main control module according to the indication signal output by the main control module.

10. A strength training device, characterized in that, It includes a driving mechanism, a strength training terminal, a transmission system, and the transmission system resistance compensation circuit according to any one of claims 1-9.

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