TWI475808B - Power generating apparatus and sampling method thereof - Google Patents

Description

Power generation device and sampling method thereof

The present invention relates to a power generating device and a sampling method thereof, and more particularly to a power generating device capable of improving the resolution of analog digital conversion and a sampling method thereof.

In today's society, with the increasing demand for energy and increasing environmental pollution, the more pollution-free and theoretically renewable renewable energy has become an important issue in today's energy development. These renewable energy sources are, for example, solar energy, wind energy, tidal energy or biomass energy. Among them, solar cells and their power generation systems can directly convert solar energy into electrical energy, which is a very important and popular part of energy development research in recent years.

FIG. 1 is a schematic diagram of a conventional solar power generation device 100. The solar panel 110 converts the received sunlight L into electrical energy, and converts the electrical energy into a stable power source by the power conversion module 120, thereby supplying power to the load 130 (in this example, the load 130 may be a battery to store electrical energy). . On the other hand, the output power of the solar panel 110 during power generation is affected by factors such as sunlight intensity, load, temperature, etc., so that the power output from the solar panel 110 cannot be maintained at the maximum power output at all times, thereby reducing power generation efficiency. Therefore, many manufacturers obtain the relevant parameters of the output power (such as the output voltage V1 or the output current, etc.) by the sampling circuit 140 to generate the pulse by using the maximum power point tracking (MPPT) in the microcontroller 150. A pulse width modulation (PWM) signal drives the power conversion module 120 to adjust the output power to the maximum power output power MPP.

Since the range of numerical variation of the output voltage V1 depends on the environmental factors (such as changes in the intensity of the sunlight) placed on the solar power generating device 100, the sampling circuit 140 tends to accommodate the maximum possible output voltage, thereby widening the sampling range. The electrical signal change value sampled by the sampling circuit 140 is not obvious with respect to the sampling range thereof, thereby affecting the resolution of the analog digital conversion, which will greatly reduce the sampling accuracy, thereby lowering the solar power generation device 100. Conversion efficiency.

The invention provides a power generating device and a sampling method thereof, which can effectively improve the analog digital conversion resolution of the sampled signal, thereby improving the conversion efficiency of the power generating device.

The invention provides a power generating device comprising a power generating unit, a sampling circuit, a control unit, and a host. The power generating unit is configured to generate an output voltage. The sampling circuit is coupled to the power generating unit, and samples the output voltage to output a sampling signal. The control unit is coupled to the sampling circuit, controls the sampling circuit to adjust the voltage value of the sampled signal, and performs a maximum power power tracking algorithm to convert the sampled signal into a one-bit signal. The host connection control unit controls the control unit to adjust the voltage value of the sampling signal according to the rate of change of the one-bit value to adjust a mapping ratio, wherein the bit value is a value corresponding to the bit signal, and the mapping ratio is the voltage value of the sampling signal. The ratio of the number of binary memory values of the number of processor memory cells corresponding to the bit signal.

In an embodiment of the present invention, the control unit samples the output voltage at a predetermined time interval, and the host determines whether the rate of change of the bit value is lower than a preset value every predetermined number of sampling intervals. If the rate of change of the element value is lower than the preset value, the voltage value of the sampled signal is adjusted to pull back the rate of change of the bit value to be greater than the preset value, and the mapping ratio is redefined in the control program for correct conversion. The actual corresponding voltage value at different proportional cycles.

In an embodiment of the present invention, when the rate of change of the bit value is lower than the preset value, if the bit value is greater than a threshold value of the set high end, the host controls the sampling circuit to decrease the voltage value of the sampled signal, if If the bit value is not greater than the threshold value, the host controls the sampling circuit to increase the voltage value of the sampled signal.

In an embodiment of the present invention, the host has a graphical user interface for displaying the analog digital conversion resolution of the sampled signal, and receiving the user's settings, and the host controls the control unit to adjust the sampling signal according to the user's setting. Voltage value.

In an embodiment of the invention, the sampling circuit includes a voltage dividing module, a sampling unit, a stepping motor control unit, and a stepping motor. The voltage dividing module is coupled to the power generating unit to divide the output voltage to output a divided voltage. The sampling unit is coupled to the voltage dividing module and the control unit, and samples the divided voltage to generate a sampling signal. The stepping motor control unit is coupled to the control unit and is controlled by the control unit to output an angular rotation signal. The stepping motor is coupled to the stepping motor control unit and the voltage dividing module, and adjusts the voltage dividing impedance ratio of the voltage dividing module according to the angle rotation signal, thereby adjusting the voltage dividing voltage.

In an embodiment of the invention, the voltage dividing module includes a sampling resistor and a variable resistor. The sampling resistor is coupled to the sampling unit. One end of the variable resistor is coupled to one end of the sampling resistor, the other end of the variable resistor is coupled to the first end of the output voltage, and the control end of the variable resistor is coupled to the stepping motor, and the other end of the sampling resistor is coupled To the second end of the output power source, wherein the stepping motor is controlled by the stepping motor control unit to adjust the resistance value of the variable resistor.

In an embodiment of the invention, the variable resistor is a knob type variable resistor.

In an embodiment of the present invention, the power generating device further includes a bridge coordination unit coupled between the variable resistor and the stepping motor for adjusting the resistance of the variable resistor according to the rotation of the stepping motor. value.

In an embodiment of the invention, the bridge coordination unit is a gear set for proportionally correcting a rotation angle of the stepping motor and the knob type variable resistor.

In an embodiment of the invention, the host has a graphical user interface for displaying the current rotation angle of the stepping motor, the target angle of the rotating stepping motor, the voltage value of the output voltage, and the analog digital conversion of the sampled signal. The resolution is adjusted, and the user's setting is received, so that the host controls the control unit to adjust the voltage value of the sampled signal according to the user's setting.

In an embodiment of the invention, the control unit calculates the voltage value of the output voltage according to the sampling signal and the impedance ratio of the voltage dividing module, and transmits the voltage value of the output voltage to the host for display.

The invention also proposes a sampling method for a power generating device, comprising the following steps. An output voltage of the power generating device is sampled to obtain a sampling signal. Performing a maximum power-power tracking algorithm based on the sampled signal converts the sampled signal into a one-bit signal. Adjusting the voltage value of the sampling signal according to the rate of change of the one-bit value to adjust a mapping ratio, wherein the bit value is a value corresponding to the bit signal, and the mapping ratio is the voltage value of the sampling signal and the bit signal corresponding to The ratio of the values.

In an embodiment of the invention, the sampling signal is obtained by sampling the output voltage at a predetermined time interval, and the step of adjusting the voltage value of the sampling signal according to the voltage change rate of the sampling signal includes the following steps. Whether the rate of change of the bit value is lower than a preset value is determined by a predetermined number of sampling intervals. If the rate of change of the bit value is lower than the preset value, the voltage value of the sampled signal is adjusted to pull back the rate of change of the bit value to be greater than the preset value, and the mapping ratio is redefined in the control program to Correctly convert the actual corresponding voltage value at different proportional cycles.

In an embodiment of the invention, the step of adjusting the voltage value of the sampled signal to pull back the rate of change of the bit value to be greater than the preset value comprises the following steps. Determine if the bit value is greater than a threshold. If the bit value is greater than a threshold value for setting the high end, the voltage value of the sampled signal is lowered. If the bit value is not greater than the threshold value, increase the voltage value of the sampled signal.

In an embodiment of the invention, the sampling method of the power generating device further includes displaying the voltage value of the output voltage on a graphical user interface.

Based on the above, the present invention adjusts the mapping ratio between the sampled signal and the bit signal by adjusting the voltage value of the sampled signal according to the rate of change of the bit value, thereby improving the analog digital conversion resolution of the sampled signal.

The above described features and advantages of the present invention will be more apparent from the following description.

DETAILED DESCRIPTION OF THE INVENTION Reference will now be made in detail to the exemplary embodiments embodiments In addition, wherever possible, the elements and/

2 is a schematic diagram of a power generating device according to an embodiment of the present invention. Referring to FIG. 2 , the power generating device 200 includes a power generating unit 202 , a sampling circuit 204 , a control unit 206 , and a host 208 . The power generating unit 202 is coupled to the sampling circuit 204, and the control unit 206 is coupled to the sampling circuit 204 and the host 208. In the present embodiment, the power generating device 200 is a solar power generating device, and the power generating unit 202 is a solar panel, but the actual application is not limited thereto. For example, in other embodiments, power generation device 200 can also be, for example, a wind power generation device or other device that utilizes different power generation principles. In addition, the control unit 206 can be, for example, a microcontroller, and the host 208 and the control unit 206 can be connected through an RS232 interface or wirelessly.

The power generating unit 202 is configured to generate an output voltage Vout, and the sampling circuit 204 is configured to sample the output voltage Vout of the power generating unit 202 to output a sampling signal S1. The control unit 206 is configured to control the sampling circuit 204 to adjust the magnitude of the voltage value of the sampling signal S1, and perform a maximum power power tracking algorithm according to the sampling signal S1 to convert the sampling signal S1 into a bit signal. In addition, the host 208 controls the control unit 206 to adjust the mapping ratio between the sampling signal S1 and the bit signal according to the change rate of the value corresponding to the bit signal (referred to herein as the bit value), that is, adjust the sampling signal S1. The resolution value of the processor memory unit bit corresponding to the voltage value and the bit signal is, for example, a processor with a general A/D of 10 bits, which is a ratio of 1024 grid values.

Since the fluctuation of the voltage value of the sampling signal S1 will be reflected in the rate of change of the bit value, and the value that the bit signal can represent is a fixed value, the sampling signal S1 can be adjusted according to the rate of change of the bit value. The voltage value is used to enlarge or reduce the mapping ratio between the sampling signal S1 and the bit signal, thereby adjusting the analog digital conversion resolution of the sampling signal S1. For example, assume that the sampling range of the sampling circuit 204 is 600 volts (V). In this case, if the voltage value of the sampling signal S1 fluctuates by 10 V, after the sampling signal S1 is converted into a bit signal, the bit value is The change in size will be quite inconspicuous, thus affecting the accuracy with which control unit 206 interprets sampled signal S1, rendering power generating device 200 unable to achieve optimal conversion efficiency. At this time, the voltage value of the sampling signal S1 can be amplified by the control unit to amplify the mapping ratio between the sampling signal S1 and the bit signal, thereby improving the analog digital conversion resolution of the sampling signal S1.

In addition, if the voltage value of the sampling signal S1 is too high, the resolution of the analog digital conversion of the sampling signal S1 is also affected. For example, if the voltage value of the sampling signal S1 falls at 540V, after the sampling signal S1 is converted into a bit signal, the range in which the bit value can be changed upwards will only be 10% of the total value. If the amplitude of the sampling signal S1 is greater than 60V at this time, the bit signal cannot correctly reflect the change of the sampling signal S1, thereby affecting the accuracy of the control unit 206 interpreting the sampling signal S1, so that the power generating device 200 cannot obtain the optimal conversion efficiency. . In this case, the voltage value of the sampling signal S1 can be reduced by the control unit to reduce the mapping ratio between the sampling signal S1 and the bit signal, so that the bit value has a larger value change space, and the bit signal is avoided. The limit limit affects the analog digital conversion resolution of the sampled signal S1.

By analogy, when the voltage value of the sampling signal S1 is too small or the voltage value is too low, the voltage value of the sampling signal S1 can be adjusted in a similar manner to improve the analog digital conversion resolution of the sampling signal S1. Generally, the skilled person should infer the implementation manner according to the embodiments taught above, and thus will not be further described herein.

Further, in order to prevent the analog digital conversion resolution adjustment mechanism of the sampling signal S1 from being triggered by sporadic voltage fluctuations, the control unit 206 can be designed to sample the output voltage Vout at a predetermined time interval. On the other hand, the host 208 determines whether the rate of change of the bit value is lower than a preset value every time a predetermined number of sampling intervals are separated, and adjusts the voltage of the sampling signal S1 if the rate of change of the bit value is lower than a preset value. The value pulls the rate of change of the bit value back to a value greater than the preset value. For example, when the rate of change of the bit value is lower than 30%, if the bit value is greater than a threshold value for setting a high end (this threshold value can be set, for example, as a bit value which can represent half of the maximum value, but not The host 208 controls the sampling circuit 206 to reduce the voltage value of the sampling signal S1 through the control unit 206. If the bit value is not greater than a threshold value of the set low end, the host 208 controls the sampling circuit 206 to raise the sampling signal S1. Voltage value.

It should be noted that, in some embodiments, the host 208 may further have a graphical user interface for displaying the analog digital conversion resolution of the sampled signal, and receiving the user's settings, and the host 208 controls according to the user's settings. The control unit 206 adjusts the voltage value of the sampling signal S1 to increase the analog digital conversion resolution of the sampling signal S1.

3 is a schematic diagram of a power generating device according to another embodiment of the present invention. Referring to FIG. 3 , in the embodiment, the sampling circuit 204 of the power generating device 300 includes a voltage dividing module 302 , a sampling unit 304 , a stepping motor control unit 306 , a stepping motor 308 , and a bridge coordination unit 310 . The voltage dividing module 302 is coupled to the power generating unit 202, the sampling unit 304, and the bridge coordination unit 310. The bridge coordination unit 310 is coupled to the motor 308, and the sampling unit 304 and the stepping motor 308 are coupled to the control unit 206.

The voltage dividing module 302 includes a variable resistor VR and a sampling resistor R1. One end of the variable resistor VR is coupled to one end of the sampling resistor R1, and the other end of the variable resistor VR is coupled to the output power terminal NP+ of the power generating unit 202. The other end of the sampling resistor R1 is coupled to the output power terminal NP- of the power generating unit 202. The control terminal of the variable resistor VR is coupled to the stepper motor 308 by the bridge coordination unit 310. Thereby, the voltage dividing module 302 can generate the output divided voltage V _DIV according to the impedance ratio of the variable resistor VR and the sampling resistor R1. In other embodiments, the voltage dividing module 302 can also replace the coupling relationship between the variable resistor VR and the sampling resistor R1, and the present invention is not limited thereto.

The sampling unit 304 is configured to sample the divided voltage V _DIV to generate the sampling signal S1. The control unit 206 receives the sampling signal S1, and restores the output voltage Vout by using the impedance ratio in the voltage dividing module 302, and performs a maximum power point tracking (MPPT) to determine and obtain the relevant parameters of the output voltage Vout ( For example, the maximum output power, the variation range of the output voltage Vout, and the like). The control unit 206 controls the stepping motor control unit 306 to output the angular rotation signal S _C according to the relevant parameters of the output voltage Vout and the related control parameters of the variable resistor VR and the related control technology of the stepping motor 308 (in this embodiment). The angular rotation signal S _C may be a Pulse Width Modulation (PWM) signal.

The stepping motor 308 receives and adjusts the resistance value of the variable resistor VR according to the angular rotation signal S _C to dynamically adjust the impedance ratio of the voltage dividing module 302. Thereby, the power generating device 300 can control the divided voltage V _DIV within the sampling range of the sampling unit 304 by dynamically adjusting the impedance ratio of the voltage dividing module 302. The control unit 206 can use the angular rotation signal S _C to control the stepping motor 308 to dynamically adjust the resistance value of the variable resistor VR. In some embodiments, the resistance value of the sampling resistor R1 can be stored in the control unit 206 to utilize the variable The resistance value of the resistor VR and the sampling resistor R1 is used to obtain the impedance ratio of the voltage dividing module 302.

In addition, since the variable resistor VR and the stepping motor 308 do not necessarily match each other, the bridge coordination unit 310 can be used to adjust the resistance value of the variable resistor VR according to the rotation of the stepping motor 308. In the present embodiment, the bridge coordination unit 310 uses a gear set as its implementation. The knob type variable resistor VR has a scale design (corresponding to the stepping motor characteristic, which is a scale of 2 degrees), so that the rotation angle of the stepping motor 308 and the knob type variable resistor can be proportionally corrected by the gear set. . For example, when the stepping motor 308 is rotated by a certain angle, the knob type variable resistor VR can increase or decrease the corresponding scale by the bridge coordination unit 310, thereby adjusting its resistance value. In other embodiments, the stepping motor 308 and the different bridge coordination unit 310 can also be used to adjust the resistance value of the sliding or other mechanical variable resistor VR.

It should be noted that the variable resistor VR conforming to the spirit of the embodiment should be a mechanical variable resistor such as a knob type variable resistor, a sliding type variable resistor or the like, thereby being controlled by the stepping motor 308. In this embodiment, the knob type variable resistor is used as the implementation manner. Therefore, the control unit 206 can utilize the corresponding relationship between the rotation angle of the knob type variable resistor and the impedance change (this correspondence relationship can be a linear relationship, but is not limited thereto). The angle and direction of rotation required by the stepping motor 308 are calculated, and the angle rotation signal S _C is output to drive the stepping motor 308 to rotate to achieve the purpose of adjusting the resistance value of the variable resistor VR.

In addition, in the embodiment, the graphical user interface of the host 208 can further display the current rotation angle of the stepping motor 308, the target angle of the rotary stepping motor 308, the voltage value of the output voltage Vout, and the analog digital conversion analysis of the sampled signal. degree. The voltage value of the output voltage Vout is calculated by the control unit 206 according to the impedance ratio of the sampling signal S1 and the voltage dividing module 302, and then transmitted to the host 208 for display.

The power generating device 300 of the embodiment of the present invention uses a mechanical component (for example, a mechanical variable resistor VR and a stepping motor 308) to accurately adjust the sampling range of the sampling circuit 310, in addition to increasing the analogy of the sampling signal S1 as shown in the embodiment of FIG. In addition to the digital conversion resolution, since the mechanical component is less affected by environmental factors (for example, ambient temperature, humidity, etc.), the application of the present embodiment can reduce the probability of failure due to environmental factors.

4 is a flow chart of a sampling method of a power generating device according to an embodiment of the present invention. Referring to FIG. 4, the sampling method of the power generating device 200 described above may be summarized as follows. First, the output voltage of the power generating device is sampled to obtain a sampling signal (step S402). In some embodiments, the sampling signal can be obtained by sampling the output voltage at a predetermined time interval. Then, a maximum power power tracking algorithm is executed according to the sampling signal to convert the sample signal into a one-bit signal (step S404). Then, the voltage value of the sampling signal is adjusted according to the rate of change of the bit value to adjust the mapping ratio (step S406). The bit value is the value corresponding to the bit signal, and the mapping ratio is the resolution of the ratio of the voltage value of the sampled signal to the bit value of the processor memory unit corresponding to the bit signal, in general A/D. For example, the processor of 10bits is 1024 grids. Finally, the voltage value of the output voltage is displayed on a graphical user interface (step S408).

In detail, the step of adjusting the voltage value of the sampling signal according to the rate of change of the bit value may include determining whether the rate of change of the bit value is lower than a predetermined value every predetermined number of sampling intervals (step S4061). If the rate of change of the bit value is lower than the preset value, the voltage value of the sample signal is adjusted to pull back the rate of change of the bit value to be greater than the preset value (step S4062). For example, when the rate of change of the bit value is lower than the preset value, it may first determine whether the bit value is greater than a threshold value, and if the bit value is greater than a threshold value of the set high end, the voltage value of the sampled signal is decreased. If the bit value is not greater than a threshold value of the set low end, the voltage value of the sampling signal is raised to pull the bit value back to be greater than the preset value, and then the process proceeds to step S408. Conversely, if it is determined in step S4061 that the rate of change of the bit value is not lower than the preset value, the process may proceed directly to step S408.

In summary, the present invention adjusts the mapping ratio between the sampled signal and the bit signal by adjusting the voltage value of the sample signal according to the rate of change of the bit value, so as to avoid the analog digital conversion resolution of the sampled signal due to sampling. If the voltage value of the signal is too large, too small, or the amplitude of the change is not obvious, it can effectively improve the analog digital conversion resolution of the sampled signal, so that the power generation device can obtain the best conversion efficiency.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100. . . Solar power plant

110. . . Solar panels

120. . . Power conversion module

130. . . load

140. . . Sampling circuit

150. . . Microcontroller

200, 300. . . Power generation unit

202. . . Power generation unit

204. . . Sampling circuit

206. . . control unit

208. . . Host

302. . . Voltage dividing module

304. . . Sampling unit

306. . . Stepper motor control unit

308. . . Stepper motor

310. . . Bridge coordination unit

Vout. . . The output voltage

S1. . . Sampling signal

VR. . . Variable resistance

R1. . . Sampling resistor

NP+, NP-. . . Output power terminal

V _DIV . . . Voltage divider

S _C . . . Angle rotation signal

S402~S408. . . Sampling method steps of power generation unit

FIG. 1 is a schematic diagram of a conventional solar power generation device.

2 is a schematic diagram of a power generating device according to an embodiment of the present invention.

3 is a schematic diagram of a power generating device according to another embodiment of the present invention.

4 is a flow chart of a sampling method of a power generating device according to an embodiment of the present invention.

S402~S408. . . Sampling method steps of power generation unit

Claims (15)

A power generating device includes: a power generating unit that generates an output voltage; a sampling circuit coupled to the power generating unit, sampling the output voltage to output a sampling signal; and a control unit coupled to the sampling circuit to control the sampling circuit to adjust Sampling the voltage value of the signal, and performing a maximum power-power tracking algorithm to convert the sampled signal into a one-bit signal; and a host connected to the control unit to control the control unit to adjust according to a rate of change of the one-bit value The voltage value of the sampled signal is adjusted to adjust a mapping ratio, wherein the bit value is a value corresponding to the bit signal, and the mapping ratio is a ratio of a voltage value of the sampled signal to a value corresponding to the bit signal. The power generating device of claim 1, wherein the control unit samples the output voltage at a predetermined time interval, and the host determines whether the rate of change of the bit value is lower than a predetermined number of sampling intervals. a preset value, if the rate of change of the bit value is lower than the preset value, adjusting a voltage value of the sample signal to pull the rate of change of the bit value back to be greater than the preset value. The power generating device of claim 2, wherein when the rate of change of the bit value is lower than the preset value, if the bit value is greater than a set high-end threshold, the host controls the sampling circuit to decrease The voltage value of the sample signal, if the rate of change of the bit value is not greater than a threshold value of the set low end, the host controls the sampling circuit to increase the voltage value of the sample signal. The power generating device of claim 1, wherein the host has a graphical user interface for displaying an analog digital conversion resolution of the sampled signal, and receiving a user setting according to the user The setting controls the control unit to adjust the voltage value of the sampled signal. The power generating device of claim 1, wherein the sampling circuit comprises: a voltage dividing module coupled to the power generating unit, and dividing the output voltage to output a divided voltage; a sampling unit, Coupling the voltage dividing module and the control unit, sampling the divided voltage to generate the sampling signal; a stepping motor control unit coupled to the control unit, and controlling the control unit to output an angular rotation signal; A stepping motor is coupled to the stepping motor control unit and the voltage dividing module, and adjusts a voltage dividing impedance ratio of the voltage dividing module according to the angle rotation signal, thereby adjusting the voltage dividing voltage. The power generating device of claim 5, wherein the voltage dividing module comprises: a sampling resistor coupled to the sampling unit; and a variable resistor, one end of the variable resistor coupled to the sampling resistor The other end of the variable resistor is coupled to the first end of the output voltage, and the control end of the variable resistor is coupled to the stepping motor, and the other end of the sampling resistor is coupled to the output power source The second end, wherein the stepping motor is controlled by the stepping motor control unit to adjust the resistance value of the variable resistor. The power generating device of claim 6, wherein the variable resistor is a knob type variable resistor. The power generating device of claim 7, further comprising: a bridge coordination unit coupled between the variable resistor and the stepping motor for adjusting the variable according to the rotation of the stepping motor The resistance value of the resistor. The power generating device of claim 8, wherein the bridge coordination unit is a gear set for proportionally correcting a rotation angle of the stepping motor and the knob type variable resistor. The power generating device of claim 5, wherein the host has a graphical user interface for displaying a current rotation angle of the stepping motor, a target angle of rotating the stepping motor, and a voltage value of the output voltage. And the analog digital conversion resolution of the sampled signal, and receiving the user's setting, so that the host controls the control unit to adjust the voltage value of the sampled signal according to the user's setting. The power generating device according to claim 10, wherein the control unit calculates a voltage value of the output voltage according to the sampling signal and an impedance ratio of the voltage dividing module, and transmits the voltage value of the output voltage to the host. display. A sampling method for a power generating device includes: sampling an output voltage of the power generating device to obtain a sampling signal; performing a maximum power power tracking algorithm according to the sampling signal, converting the sampling signal into a bit signal; Adjusting the voltage value of the sample signal according to the rate of change of the one-bit value to adjust a mapping ratio, wherein the bit value is a value corresponding to the bit signal, and the mapping ratio is a voltage value of the sample signal and the bit The ratio of the values corresponding to the yuan signal. The method for sampling a power generating device according to claim 12, wherein the sampling signal is obtained by sampling the output voltage at a predetermined time interval, and adjusting a voltage of the sampling signal according to a voltage change rate of the sampling signal. The step of determining includes: determining, by a predetermined number of sampling intervals, whether the rate of change of the bit value is lower than a preset value; and adjusting the sampling signal if the rate of change of the bit value is lower than the preset value The voltage value is to pull back the rate of change of the bit value to be greater than the preset value. The sampling method of the power generating device of claim 13, wherein the step of adjusting the voltage value of the sampling signal to pull the rate of change of the bit value back to the preset value comprises: determining the bit Whether the value is greater than a threshold; if the value of the bit is greater than the threshold, the voltage value of the sampled signal is decreased; if the value of the bit is not greater than the threshold, the voltage of the sampled signal is raised. The method for sampling a power generating device according to claim 11, further comprising: displaying the voltage value of the output voltage on a graphical user interface.