A power generation device based on rotational power generation and a pedaling frequency calculation method

Abstract

The invention discloses a power generation device based on rotational power generation and a cadence calculation method. The power generation device is installed on a rotating accessory, and includes a coil, a guide rail frame, a calculation module and at least one magnet; the output end of the coil is electrically connected to the calculation module, the calculation module is connected to a low-power accessory, the coil is installed on the outer side of the guide rail frame, and the magnet is arranged in the cavity of the guide rail frame; when the accessory rotates, the coil and the guide rail frame rotate with the accessory, the magnet moves relative to the coil under its own gravity, cuts the magnetic flux lines to generate alternating current, and the alternating current is output to the calculation module through the coil; the calculation module rectifies the alternating current into direct current and outputs it for power supply, and also performs waveform extraction and analog-to-digital conversion on the alternating current, and calculates the magnitude of the cadence according to the digital signal obtained by the conversion. No backup battery is required, and no battery replacement is required, which saves the cost of the battery and reduces environmental pollution; the calculated cadence value is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent bicycle accessories, and in particular to a power generation device based on rotational power generation and a pedaling frequency calculation method. Background Art

[0002] At present, low-power accessories of bicycles, such as cadence sensors and speed sensors, require built-in batteries for power supply. However, batteries are usually disposable batteries, and they need to be replaced immediately after they run out of power, otherwise they cannot be used any longer; because the remaining battery power is unknown, a spare battery needs to be prepared at all times, which is inconvenient to carry, and it is not environmentally friendly to discard the battery after it runs out. At the same time, a MEMS (Microelectro Mechanical Systems) sensor is set in the cadence sensor, and its output noise is relatively large, resulting in large errors in calculating the lap cadence. Summary of the invention

[0003] In view of the various deficiencies in the prior art, the inventors have researched and designed a power generation device based on rotational power generation and a cadence calculation method through long-term practice. The device generates electricity and supplies power to low-power accessories through its own rotational motion, and can also calculate a more accurate cadence based on the waveform of the alternating current.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A power generation device based on rotational power generation is installed on a rotating accessory, and comprises a coil, a guide rail frame, a computing module and at least one magnet; the output end of the coil is electrically connected to the computing module, the coil is installed on the outer side of the guide rail frame, and the magnet is arranged in the cavity of the guide rail frame; when the accessory rotates, the coil and the guide rail frame rotate along with the accessory, and the magnet moves relative to the coil under its own gravity, cutting the magnetic flux lines to generate alternating current, and the alternating current is output to the computing module through the coil; the computing module rectifies the alternating current into direct current and outputs it for power supply, and also performs waveform extraction and analog-to-digital conversion on the alternating current, and calculates the magnitude of the pedaling frequency according to the digital signal obtained by the conversion.

[0006] Furthermore, in the power generation device based on rotational power generation, the coil is a multi-turn coil formed by winding enameled wire in the same direction, the multi-turn coil is bent multiple times, and the enameled wires at both ends of the multi-turn coil are extended to serve as two output ends of the coil.

[0007] Furthermore, in the power generation device based on rotational power generation, the multi-turn coil is bent into a coil ring composed of a plurality of semi-rings with different radii and inner and outer concave and convex shapes.

[0008] Furthermore, in the power generation device based on rotational power generation, the guide rail frame is a tubular closed circular ring slide rail with a hollow middle, the magnet is arranged in the cavity of the guide rail frame and can roll in the guide rail frame, and the coil is tightly attached to the top surface or bottom surface of the guide rail frame.

[0009] Furthermore, in the power generation device based on rotational power generation, the guide rail frame includes a hollow fan-shaped tubular slide rail, a support rod is provided on the inner side of the fan-shaped tubular slide rail, the top of the support rod is the rotation center of the round head, and the fan-shaped tubular slide rail rotates with the round head as the center; at least one magnet is fixed in the cavity of the fan-shaped tubular slide rail.

[0010] Furthermore, in the power generation device based on rotational power generation, the magnet is a sphere or a cylinder with a diameter of 8 mm; the inner radius of the guide rail frame is 2 cm, and the outer radius is 3 cm.

[0011] Further, in the power generation device based on rotational power generation, the calculation module includes a rectifier circuit, a waveform extraction circuit, an ADC converter and an MCU;

[0012] The rectifier circuit rectifies the alternating current output by the coil into direct current and outputs it to the connected low-power accessories, waveform extraction circuit and MCU for power supply;

[0013] The waveform extraction circuit extracts the waveform of the alternating current to obtain a corresponding analog signal;

[0014] The ADC converter converts the analog signal into a digital signal;

[0015] The MCU calculates the magnitude of the pedaling frequency according to the digital signal.

[0016] Further, in the power generation device based on rotational power generation, the waveform extraction circuit includes an operational amplifier, a first diode, a second diode, a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor;

[0017] The positive electrode of the first diode is connected to an output end of the coil, the negative electrode of the first diode is connected to the negative electrode of the second diode and one end of the first resistor, the positive electrode of the second diode is connected to the other output end of the coil, the other end of the first resistor is connected to one end of the second resistor and one end of the third resistor, the other end of the second resistor is connected to one end of the first capacitor and one end of the fifth resistor, the other end of the third resistor is connected to one end of the fourth resistor and ground, the other end of the fourth resistor is connected to the other end of the first capacitor and one end of the sixth resistor, the other end of the fifth resistor is connected to one end of the seventh resistor and the non-inverting input end of the operational amplifier, the other end of the seventh resistor is input with voltage, the other end of the sixth resistor is connected to the inverting input end of the operational amplifier and one end of the eighth resistor, the power supply end of the operational amplifier is input with supply voltage, the ground end of the operational amplifier is grounded, and the output end of the operational amplifier is connected to the other end of the eighth resistor and the ADC converter.

[0018] Further, in the power generation device based on rotational power generation, the waveform extraction circuit further includes a ninth resistor, a second capacitor and a third capacitor;

[0019] One end of the ninth resistor is connected to the output end of the operational amplifier, the other end of the ninth resistor is connected to one end of the second capacitor and the ADC converter, one end of the third capacitor is connected to the power supply end of the operational amplifier, and the other end of the second capacitor and the other end of the third capacitor are both grounded.

[0020] A second aspect of an embodiment of the present invention provides a method for calculating a pedaling frequency using the aforementioned power generation device based on rotational power generation, which comprises:

[0021] Rectify the AC power output by the coil into DC power and output it for power supply;

[0022] Extract the waveform of the alternating current to obtain the corresponding analog signal;

[0023] Convert analog signals into digital signals;

[0024] The cadence is calculated based on the digital signal.

[0025] The beneficial effects of the present invention are:

[0026] By using the gravity of the magnet itself, when the coil rotates with the accessory, the magnet and the coil produce relative movement and cut the magnetic induction line to generate electricity. It is very convenient to use, no backup batteries are required, and no battery replacement is required, which saves battery costs and reduces environmental pollution; there is no need to worry about insufficient remaining power, and continuous, green and environmentally friendly power supply can be achieved during exercise. At the same time, the waveform of the alternating current can be extracted, and the size of the pedaling frequency can be calculated after obtaining the corresponding digital signal, making the calculation result more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1is a schematic structural diagram of a power generation device based on rotational power generation in Embodiment 1 of the present invention;

[0028] Figure 2 It is a schematic diagram of the installation and rotation of the power generation device based on rotation power generation in the first embodiment of the present invention;

[0029] Figure 3 is a schematic structural diagram of a coil in an embodiment of the present invention;

[0030] Figure 4 is a schematic structural diagram of a guide rail frame and a magnet in an embodiment of the present invention;

[0031] Figure 5 is another structural schematic diagram of the guide rail frame and the magnet in an embodiment of the present invention;

[0032] Figure 6 is another structural schematic diagram of the power generation device in an embodiment of the present invention;

[0033] Figure 7 is a circuit diagram of a waveform extraction circuit in an embodiment of the present invention;

[0034] Figure 8 is a schematic diagram of a voltage waveform generated in a coil in an embodiment of the present invention;

[0035] Fig. 9 is a schematic diagram of a rectified waveform after rectification in an embodiment of the present invention;

[0036] Fig.10 4 is a flow chart of a method for calculating cadence in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] Please also see Figure 1 and Figure 2 The power generation device based on rotation power generation provided by an embodiment of the present invention is installed (such as tied with a rubber ring) on ​​a rotating accessory (such as a crank 5 of a bicycle), and the power generation device includes a coil 1, a guide rail frame 2, at least one magnet 3 and a computing module 4; the output end of the coil 1 is electrically connected to the computing module 4, and the computing module 4 is connected to a low-power accessory. The coil 1 is fixed on the outer side of the guide rail frame 2, and the magnet 3 is arranged in the cavity of the guide rail frame 2; when the accessory rotates, the coil 1 and the guide rail frame 2 rotate with the accessory, and the magnet 3 moves relative to the coil 1 under its own gravity (such as Figure 2The magnetic flux lines are cut to generate alternating current, which is output to the calculation module 4 through the coil 1; the calculation module 4 rectifies the alternating current into direct current and outputs it for power supply, and also performs waveform extraction and analog-to-digital conversion on the alternating current, and calculates the pedaling frequency based on the digital signal obtained by the conversion.

[0039] This embodiment uses the gravity of the magnet itself, and when the coil rotates with the accessory, the magnet and the coil produce relative motion and cut the magnetic induction line to generate electricity; it is mainly used to power low-power accessories of bicycles (requiring a small voltage), and in specific implementation, it can also power low-power accessories inside other sports equipment (such as treadmills and indoor bicycles). The waveform of the alternating current is directly extracted and converted into a corresponding digital signal, and the size of the pedaling frequency is calculated based on the digital signal, so that the calculation result is more accurate.

[0040] Please also read Figure 3 The coil 1 is a multi-turn coil made of 0.1 mm enameled wire wound in the same direction, which generates electromotive force when cutting the magnetic flux lines. In order to increase the cutting of the magnetic flux lines of the coil 1 by the magnet 3, the multi-turn coil needs to be further bent several times after being wound, such as bending into Figure 3 The coil ring shown is composed of multiple semi-circular coils with different radii and inner and outer concave and convex shapes ( Figure 3 The dotted circle in the upper middle represents a convex semicircular shape, and the dotted circle in the lower middle represents a concave semicircular shape, and the concave and convex shapes are arranged in order), and the enameled wires at both ends of the multi-turn coil are extended (can be stretched into a straight line or bent into any shape) as the two output ends (IN1, IN2) of the coil 1 to connect the calculation module 4. The frequency and amplitude of the alternating current generated by coils with different bending shapes are also different. In the specific implementation, the multi-turn coil can also be bent into other shapes, and the size and density of the arc can be adjusted arbitrarily or according to needs, and are not limited here. The number of turns of the enameled wire is preferably 500 turns. The more turns, the higher the generated voltage.

[0041] Please also read Figure 4The guide rail frame 2 is a hollow tubular ring slide rail (such as a hollow ring, which can be made of non-magnetic material), the guide rail frame 2 is closed, and the magnet 3 (usually one magnet is set, if there are more than one magnet, it will affect the sliding of the magnet) is set in the cavity of the guide rail frame 2 and can roll in the guide rail frame 2, the coil 1 is tightly attached (such as glued or tied) to the top or bottom surface of the guide rail frame 2, the coil 1 and the guide rail frame 2 are not in the same plane, and the guide rail frame 2 is installed on a rotating accessory. When the guide rail frame 2 is stationary, the magnet is always located directly below the cavity of the guide rail frame 2 due to gravity; when the guide rail frame 2 rotates with the accessory, the magnet will initially move up with the inner wall of the cavity due to sudden power, but because of the weight of the magnet 3 itself, it will slide towards the bottom of the cavity under the action of gravity, and will move relative to the coil 1 during the sliding process, so that the magnetic flux lines can be cut to generate alternating current.

[0042] In the second embodiment, the guide rail frame can also be set as Figure 5 The structure shown in the figure comprises a hollow fan-shaped tubular slide rail 6, a support rod 7 is provided inside the fan-shaped tubular slide rail 6, the top of the support rod 7 is the rotation center of the round head 8, that is, the fan-shaped tubular slide rail 6 can rotate with the round head 8 as the center; at least one magnet 3 (such as 3) is fixed in the cavity of the fan-shaped tubular slide rail 6. Figure 6 As shown, the coil 1 can be fixed on the surface of the accessory and then the guide frame can be placed on the surface of the coil 1. The round head 8 of the guide frame is fixed on the surface of the accessory and is located at the center of the coil 1. The length of the support rod 7 is adapted to the radius of the coil 1, so that the magnetic flux lines of the coil 1 can be cut when the fan-shaped tubular slide 6 rotates. When the coil 1 rotates with the accessory, the friction force will also drive the guide frame to rotate. Due to the weight of the internal magnet and its own weight, the guide frame will swing around the center of the coil 1 under the positioning limit of the round head 8. At this time, the magnet 3 will not slide in the cavity but swing back and forth with the guide frame, which can cut the magnetic flux lines to generate alternating current. A magnet can be set, or it can be as follows Figure 6 As shown, three magnets are provided (NSN represents the polarities corresponding to the three magnets). Increasing the number of magnets can increase the peak value of the output voltage.

[0043] like Figure 4 As shown, the magnet 3 can be set as a sphere or cylinder with a diameter d of 8 mm (the calculation of power generation capacity mainly depends on the magnetic field strength and the cross-sectional area of ​​the magnet 3), and a strong magnet with a magnetic field strength of 0.2T. Figure 4As shown, when the guide rail frame 2 is a circular slide rail, its inner radius r1 is 2 cm, the outer radius r2 is 3 cm, and the rolling radius r of the magnet 3 is about 2.5 cm. When the pedaling frequency reaches 45 RPM, the angular velocity of the magnet 3 rotates ω=45 / 60×2π≈4.71, the linear velocity of the magnet v=r×ω≈0.11775m / s, and the output voltage=n×B×d×v=0.0942V, where n is the number of coil turns (500), B is the magnetic field strength, d is the diameter of the magnet 3, and r is the rolling radius of the magnet. If four magnets are used, the output voltage can reach 0.378V. This voltage is enough to make some low-voltage devices work.

[0044] The calculation module 4 includes a rectifier circuit 41, a waveform extraction circuit 42, an ADC converter 43 and an MCU 44; the rectifier circuit 41 rectifies the alternating current output by the coil 1 into direct current and outputs it to the connected low-power accessories, the waveform extraction circuit and the MCU for power supply; the waveform extraction circuit 42 performs waveform extraction on the alternating current to obtain a corresponding analog signal (a signal type that can be collected by the ADC converter 43), the ADC converter 43 converts the analog signal into a digital signal, and the MCU 44 calculates the pedaling frequency based on the digital signal.

[0045] The rectifier circuit 41 can be composed of an existing rectifier bridge composed of four diodes and a DCDC chip. The rectifier bridge rectifies the AC power output from the output end of the coil 1 into DC power, and stabilizes the voltage into a 3.3V power supply voltage VDD through the DCDC chip to power low-power accessories, MCU, waveform extraction circuits, etc.

[0046] Please also read Figure 7The waveform extraction circuit 42 includes an operational amplifier IC, a first diode D1, a second diode D2, a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8; the positive electrode of the first diode D1 is connected to an output end IN1 of the coil 1, the negative electrode of the first diode D1 is connected to the negative electrode of the second diode D2 and one end of the first resistor R1, the positive electrode of the second diode D2 is connected to the other output end IN2 of the coil 1, the other end of the first resistor R1 is connected to one end of the second resistor R2 and one end of the third resistor R3, the other end of the second resistor R2 is connected to one end of the first capacitor C1 and the fifth resistor R8. One end of the resistor R5 and the other end of the third resistor R3 are connected to one end of the fourth resistor R4 and ground, the other end of the fourth resistor R4 is connected to the other end of the first capacitor C1 and one end of the sixth resistor R6, the other end of the fifth resistor R5 is connected to one end of the seventh resistor R7 and the in-phase input terminal of the operational amplifier IC, the other end of the seventh resistor R7 inputs the REF voltage (whose voltage value is equal to half of the power supply voltage VDD), the other end of the sixth resistor R6 is connected to the inverting input terminal of the operational amplifier IC and one end of the eighth resistor R8, the power supply terminal of the operational amplifier IC inputs the power supply voltage VDD, the ground terminal of the operational amplifier IC is grounded, and the output end of the operational amplifier IC is connected to the other end of the eighth resistor R8 and the ADC converter 43.

[0047] Among them, the first diode D1 and the second diode D2 are used to perform half-wave rectification on the alternating current input by the coil, the first resistor R1 and the third resistor R3 are used for voltage division; the first capacitor C1, the second resistor R2, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are used to perform low-pass filtering on the voltage after voltage division; the fourth resistor R4 and the sixth resistor R6 are also used together with the seventh resistor R7 to calculate the amplification factor; the second resistor R2 and the fifth resistor R5 are also used together with the eighth resistor R8 to form a voltage divider circuit to provide a reference voltage for the operational amplifier IC. The operational amplifier IC compares the voltage after low-pass filtering with the reference voltage and outputs an analog signal OUT. The waveform of the analog signal is as follows: Fig. 9 shown.

[0048] Preferably, the waveform extraction circuit 42 also includes a ninth resistor R9, a second capacitor C2 and a third capacitor C3; one end of the ninth resistor R9 is connected to the output end of the operational amplifier IC, the other end of the ninth resistor R9 is connected to one end of the second capacitor C2 and the ADC converter 43, one end of the third capacitor C3 is connected to the power supply end of the operational amplifier IC, and the other end of the second capacitor C2 and the other end of the third capacitor C3 are both grounded.

[0049] The ninth resistor R9 and the second capacitor C2 form a low-pass filter circuit for filtering the output analog signal OUT. The third capacitor C3 is used to filter the power supply voltage VDD at the power supply end of the operational amplifier IC, so that the operational amplifier IC works more stably.

[0050] It is important to understand that Figure 7 Only one circuit structure of the waveform extraction circuit 42 is shown. In specific implementation, other circuit structures may also be used as long as the waveform of the alternating current can be extracted.

[0051] In this embodiment, the guide rail frame 2 is an annular slide rail as an example. Fig.10 The pedaling frequency calculation method based on the above power generation device includes:

[0052] S100, rectifying the alternating current output by the coil into direct current and outputting the direct current for power supply.

[0053] Before this step, when the crank 5 of the bicycle rotates, the coil 1 and the guide rail frame 2 rotate with the crank 5, and the magnet 3 moves relative to the coil 1 under its own gravity. At this time, the magnetic flux in the coil will change, cutting the magnetic flux lines to generate alternating current. The waveform of the alternating current is as follows: Figure 8 shown.

[0054] In this step, the rectifier circuit rectifies the AC power into DC power and then supplies power to the connected low-power accessories, waveform extraction circuit and MCU.

[0055] S200: extract the waveform of the alternating current to obtain a corresponding analog signal.

[0056] S300, converting the analog signal into a digital signal.

[0057] S400: Calculate the pedaling frequency according to the digital signal.

[0058] In this step, when the magnets rotate at the same speed to different coil structures, the amplitude and period of the alternating current generated are different, such as Figure 3 The waveforms corresponding to the positions A, B, and C shown in Figure 8 As shown in the figure, the MCU extracts the peak voltage based on the data in the digital signal, calculates the time point of each peak voltage, and then calculates the period of the peak value. The size of the period determines whether the magnet moves from position C to position A or from position A to position C, and identifies the forward and reverse rotation.

[0059] When calculating the cadence, for a given wound coil, the number of A, B, and C is fixed, and the number of each waveform in A, B, and C is also fixed, that is, the angle corresponding to each waveform is known, and the time interval of the peak value of each waveform can be calculated by the MCU, and then the instantaneous cadence can be calculated based on the angle and time interval corresponding to the peak value, and the cadence can be obtained by averaging multiple instantaneous cadences.

[0060] In summary, the power generation device based on rotational power generation and the method for calculating the cadence provided by the present invention set the magnet in the guide rail frame, and when the coil rotates with the accessory, the magnet and the coil are caused to move relative to each other by using the gravity of the magnet itself, thereby cutting the magnetic induction line to generate alternating current, rectifying the alternating current into direct current and outputting it to power the connected low-power accessory; it is very convenient to use, and does not require backup batteries or battery replacement, thus saving battery costs and reducing environmental pollution; there is no need to worry about insufficient remaining power, and continuous, green and environmentally friendly power supply can be achieved during exercise. At the same time, the waveform of the alternating current can be extracted, and the magnitude of the cadence can be calculated after obtaining the corresponding digital signal, so that the calculation result is more accurate.

[0061] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A power generation device based on rotational power generation, mounted on a rotating accessory, characterized in that: The invention comprises a coil, a guide rail frame, a computing module and at least one magnet; the output end of the coil is electrically connected to the computing module, the coil is mounted on the outer side of the guide rail frame, and the magnet is arranged in the cavity of the guide rail frame; when the accessory rotates, the coil and the guide rail frame rotate along with the accessory, the magnet moves relative to the coil under its own gravity, cuts the magnetic flux lines to generate alternating current, and the alternating current is output to the computing module through the coil; the computing module rectifies the alternating current into direct current and outputs it for power supply, and also performs waveform extraction and analog-to-digital conversion on the alternating current, and calculates the magnitude of the pedaling frequency according to the digital signal obtained by the conversion; The calculation module includes a rectifier circuit, a waveform extraction circuit, an ADC converter and an MCU; The rectifier circuit rectifies the alternating current output by the coil into direct current and outputs it to the connected low-power accessories, waveform extraction circuit and MCU for power supply; The waveform extraction circuit extracts the waveform of the alternating current to obtain a corresponding analog signal; The ADC converter converts the analog signal into a digital signal; The MCU calculates the magnitude of the pedaling frequency according to the digital signal; The waveform extraction circuit includes an operational amplifier, a first diode, a second diode, a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor; The positive electrode of the first diode is connected to an output end of the coil, the negative electrode of the first diode is connected to the negative electrode of the second diode and one end of the first resistor, the positive electrode of the second diode is connected to the other output end of the coil, the other end of the first resistor is connected to one end of the second resistor and one end of the third resistor, the other end of the second resistor is connected to one end of the first capacitor and one end of the fifth resistor, the other end of the third resistor is connected to one end of the fourth resistor and ground, the other end of the fourth resistor is connected to the other end of the first capacitor and one end of the sixth resistor, the other end of the fifth resistor is connected to one end of the seventh resistor and the non-inverting input end of the operational amplifier, the other end of the seventh resistor is input with voltage, the other end of the sixth resistor is connected to the inverting input end of the operational amplifier and one end of the eighth resistor, the power supply end of the operational amplifier is input with supply voltage, the ground end of the operational amplifier is grounded, and the output end of the operational amplifier is connected to the other end of the eighth resistor and the ADC converter.

2. The power generation device based on rotational power generation according to claim 1, characterized in that: The coil is a multi-turn coil formed by winding enameled wires in the same direction. The multi-turn coil is bent multiple times, and the enameled wires at both ends of the multi-turn coil are extended to serve as two output ends of the coil.

3. The power generation device based on rotational power generation according to claim 2, characterized in that: The multi-turn coil is bent into a coil ring composed of a plurality of semi-rings with different radii and inner and outer concave and convex shapes.

4. The power generation device based on rotational power generation according to claim 1, characterized in that: The guide rail frame is a hollow tubular closed circular ring slide rail in the middle, the magnet is arranged in the cavity of the guide rail frame and can roll in the guide rail frame, and the coil is closely attached to the top surface or the bottom surface of the guide rail frame.

5. The power generation device based on rotational power generation according to claim 1, characterized in that: The guide rail frame includes a hollow fan-shaped tubular slide rail, a support rod is provided on the inner side of the fan-shaped tubular slide rail, the top of the support rod is the rotation center of the round head, and the fan-shaped tubular slide rail rotates around the round head; at least one magnet is fixed in the cavity of the fan-shaped tubular slide rail.

6. The power generation device based on rotational power generation according to claim 2, characterized in that: The magnet is a sphere or cylinder with a diameter of 8 mm; the inner radius of the guide rail frame is 2 cm, and the outer radius is 3 cm.

7. The power generation device based on rotational power generation according to claim 1, characterized in that: The waveform extraction circuit also includes a ninth resistor, a second capacitor and a third capacitor; One end of the ninth resistor is connected to the output end of the operational amplifier, the other end of the ninth resistor is connected to one end of the second capacitor and the ADC converter, one end of the third capacitor is connected to the power supply end of the operational amplifier, and the other end of the second capacitor and the other end of the third capacitor are both grounded.

8. A method for calculating the pedaling frequency using the power generation device based on rotational power generation according to claim 1, characterized in that: include: Rectify the AC power output by the coil into DC power and output it for power supply; Extract the waveform of the alternating current to obtain the corresponding analog signal; Convert analog signals into digital signals; The cadence is calculated based on the digital signal.

Images