Pulse Width Modulation Signal Voltage Measuring Device, Motor Driving Device and Method Thereof

Abstract

A pulse-width modulation signal voltage measurement device includes a conversion circuit and a processing circuit. The conversion circuit receives a first pulse-width modulation signal and a second pulse-width modulation signal from a motor driving device, and converts the first pulse-width modulation signal and the second pulse-width modulation signal into an absolute value signal and a polarity signal of a line-to-line voltage signal between the first pulse-width modulation signal and the second pulse-width modulation signal. The processing circuit converts the polarity signal and the absolute value signal into a first integration signal and a second integration signal, and reconstructs the line-to-line voltage signal based on the first integration signal and the second integration signal to obtain a reconstructed voltage signal of the line-to-line voltage signal.

Description

Technical Field

[0001] The present disclosure relates to a pulse width modulation signal voltage measurement device, a motor drive device, and a method thereof. Background Art

[0002] Pulse-width modulation (PWM) can change the amplitude of the output voltage by adjusting the duty cycle of the power transistor, and has advantages such as high efficiency and saving computing data. At present, pulse-width modulation has been widely applied to various different components such as drivers and inverters to control the switching of motors (power transistors). In order to avoid the simultaneous conduction of multiple switches of the motor resulting in switch damage, a dead time protection mechanism needs to be provided. However, this dead time will cause a switching error between the output of the pulse width modulation signal and the command. When the switch operates at a low duty cycle, this switching error will be quite significant.

[0003] Generally, real-time voltage command compensation is usually performed by hardware measuring the feedback signal to improve the switching error caused by the dead time. However, this method requires the use of a voltage-frequency converter circuit to perform signal conversion, and the input voltage of existing voltage-frequency conversion chips is usually low voltage, so its application is greatly limited. In addition, existing voltage-frequency converter chips are relatively expensive, so the cost will be greatly increased. Summary of the Invention

[0004] According to an embodiment of the present disclosure, a pulse width modulation signal voltage measurement device is proposed, which includes a conversion circuit and a processing circuit. The conversion circuit receives a first pulse width modulation signal and a second pulse width modulation signal from a motor drive device, and converts the first pulse width modulation signal and the second pulse width modulation signal into an absolute value signal and a polarity signal of the line-to-line voltage signal between the first pulse width modulation signal and the second pulse width modulation signal. The processing circuit converts the polarity signal and the absolute value signal into a first integration signal and a second integration signal, and then reconstructs the line-to-line voltage signal according to the first integration signal and the second integration signal to obtain a reconstructed voltage signal of the line-to-line voltage signal.

[0005] According to another embodiment of the present disclosure, a motor driving device is provided, which includes a signal generator and a pulse width modulation signal voltage measuring device. The signal generator generates a first pulse width modulation signal and a second pulse width modulation signal. The pulse width modulation signal voltage measuring device is connected to the signal generator and includes a conversion circuit and a processing circuit. The conversion circuit receives the first pulse width modulation signal and the second pulse width modulation signal, and converts the first pulse width modulation signal and the second pulse width modulation signal into an absolute value signal and a polarity signal of the line-to-line voltage signal between the first pulse width modulation signal and the second pulse width modulation signal. The processing circuit converts the polarity signal and the absolute value signal into a first integration signal and a second integration signal, and then reconstructs the line-to-line voltage signal according to the first integration signal and the second integration signal to obtain a reconstructed voltage signal of the line-to-line voltage signal.

[0006] According to still another embodiment of the present disclosure, a method for measuring the voltage of a pulse width modulation signal is provided, which includes the following steps: converting a first pulse width modulation signal and a second pulse width modulation signal into an absolute value signal of the line-to-line voltage signal between the first pulse width modulation signal and the second pulse width modulation signal; converting the line-to-line voltage signal into a polarity signal; converting the polarity signal and the absolute value signal into a first integration signal and a second integration signal; and reconstructing the line-to-line voltage signal according to the first integration signal and the second integration signal to obtain a reconstructed voltage signal of the line-to-line voltage signal. Description of the Drawings

[0007] Figure 1 It is a block diagram of a pulse width modulation signal voltage measuring device according to an embodiment of the present disclosure.

[0008] Figure 2 It is a flowchart of a method for measuring the voltage of a pulse width modulation signal according to an embodiment of the present disclosure.

[0009] Figure 3 It is a circuit diagram of a pulse width modulation signal voltage measuring device according to another embodiment of the present disclosure.

[0010] Figures 4A to 4M It is a schematic diagram of the signal processing process of a pulse width modulation signal voltage measuring device according to another embodiment of the present disclosure.

[0011] Figure 5 It is a flowchart of a method for measuring the voltage of a pulse width modulation signal according to another embodiment of the present disclosure.

[0012] 1: Pulse width modulation signal voltage measuring device

[0013] 11: Conversion circuit

[0014] 111: Voltage dividing circuit

[0015] 112: Differential circuit

[0016] 113: Polarity correction circuit

[0017] 114: Polarity retention circuit

[0018] 12: Processing circuit

[0019] 121: Digital integration module

[0020] 122: Phase reconstruction module

[0021] 123: Line-to-phase conversion module

[0022] 2: Motor drive device

[0023] 21: Signal generator

[0024] M: Motor

[0025] V a : First pulse width modulation signal

[0026] V b : Second pulse width modulation signal

[0027] V c : Third pulse width modulation signal

[0028] V an : First voltage signal

[0029] V bn : Second voltage signal

[0030] V ab : Line-to-line voltage signal

[0031] |V ab |: Absolute value signal

[0032] V p : Polarity signal

[0033] V t1 : First integration signal

[0034] V t2 : Second integration signal

[0035] V ab ’: Reconstructed voltage signal of line-to-line voltage signal

[0036] V a ’: Reconstructed voltage signal of first pulse width modulation signal

[0037] S21~S25,S51~S57: Step flow Specific implementation mode

[0038] Embodiments of a pulse width modulation signal voltage measurement device and method according to the present disclosure will be described below with reference to the relevant diagrams. For the sake of clarity and convenience in diagram illustration, the components in the diagrams may be presented in an exaggerated or reduced size and proportion. In the following description and / or claims, when an element is referred to as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element or there may be intervening elements; while when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements, and other words used to describe the relationship between elements or layers should be interpreted in the same way. For ease of understanding, the same elements in the following embodiments are denoted by the same reference numerals.

[0039] Please refer to Figure 1 , which is a block diagram of a pulse width modulation signal voltage measurement device according to an embodiment of the present disclosure. As shown in the figure, the pulse width modulation signal voltage measurement device 1 is connected to the motor drive device 2 and includes a conversion circuit 11 and a processing circuit 12. In one embodiment, the processing circuit 12 may be a microcontroller (MCU), a central processing unit (CPU), an application specific integrated circuit chip (ASIC), or other similar components.

[0040] The motor drive device 2 generates a first pulse width modulation signal V a , a second pulse width modulation signal V b and a third pulse width modulation signal V c to drive the motor M. In one embodiment, the motor drive device 2 may be an inverter, a driver, or other similar devices.

[0041] The conversion circuit 11 is connected to the processing circuit 12. The conversion circuit 11 receives the first pulse width modulation signal V a and the second pulse width modulation signal V b from the motor drive device 2. Then, the conversion circuit 11 divides the first pulse width modulation signal V a and the second pulse width modulation signal V b to generate a first voltage signal and a second voltage signal; the purpose of this step is to step down the high-voltage first pulse width modulation signal V a and the second pulse width modulation signal V b to generate a first voltage signal and a second voltage signal that can be processed by the conversion circuit 11 and the processing circuit 12. Then, the conversion circuit 11 performs a differential operation to subtract the first voltage signal from the second voltage signal to obtain a line-to-line voltage signal. Next, the conversion circuit 11 performs polarity correction on the line-to-line voltage signal to obtain an absolute value signal, and rectifies the line-to-line voltage signal to obtain a polarity signal with the polarity information of the line-to-line voltage signal.

[0042] The processing circuit 12 performs digital integration on the polarity signal and the absolute value signal to obtain a first integration signal and a second integration signal, and then executes a phase reconstruction algorithm based on the first integration signal, the second integration signal, and the absolute value signal to reconstruct the line-to-line voltage signal, and obtains the reconstructed voltage signal of the line-to-line voltage signal. Finally, the processing circuit executes a line-to-phase voltage conversion algorithm based on the reconstructed voltage signal of the line-to-line voltage signal to reconstruct the first pulse width modulation signal V a to obtain the reconstructed voltage signal of the first pulse width modulation signal V a .

[0043] Through the above mechanism, the pulse width modulation signal voltage measuring device 1 can convert the high-voltage first pulse width modulation signal V a and the second pulse width modulation signal V b into voltage signals that it can process through a voltage division step, and then perform signal processing and signal reconstruction through simple digital logic operations, and can effectively measure the true phase voltage value of the first pulse width modulation signal V a without the need for a voltage-frequency conversion chip. Therefore, the pulse width modulation signal voltage measuring device 1 can be more widely applied and can greatly reduce costs.

[0044] Of course, the above is only an example, and the components, their connection relationships, and cooperation relationships of the pulse width modulation signal voltage measuring device 1 can be adjusted according to actual needs, and the present disclosure is not limited thereto.

[0045] Please refer to Figure 2 , which is a flowchart of a pulse width modulation signal voltage measuring method according to an embodiment of the present disclosure. As shown in the figure, the pulse width modulation signal voltage measuring method of this embodiment may include the following steps:

[0046] Step S21: Convert the first pulse width modulation signal and the second pulse width modulation signal into an absolute value signal of the line-to-line voltage signal between the first pulse width modulation signal and the second pulse width modulation signal.

[0047] Step S22: Convert the line-to-line voltage signal into a polarity signal.

[0048] Step S23: Convert the polarity signal and the absolute value signal into a first integration signal and a second integration signal.

[0049] Step S24: Reconstruct the line-to-line voltage signal according to the first integration signal and the second integration signal to obtain the reconstructed voltage signal of the line-to-line voltage signal.

[0050] Step S25: Convert the reconstructed voltage signal of the line-to-line voltage signal into the reconstructed voltage signal of the first pulse width modulation signal according to the phase of the first pulse width modulation signal and the phase of the second pulse width modulation signal.

[0051] Please refer toFigure 3 and Figures 4A to 4M which is a circuit diagram of a pulse width modulation signal voltage measurement device according to another embodiment of the present disclosure and a schematic diagram of the signal processing process of the pulse width modulation signal voltage measurement device; Figure 2 Illustrate one of the circuit designs of the pulse width modulation signal voltage measurement device 1. As Figure 2 shown, the pulse width modulation signal voltage measurement device 1 is connected to the motor drive device 2 and includes a conversion circuit 11 and a processing circuit 12.

[0052] The motor drive device 2 includes a signal generator 21. The signal generator 21 generates a first pulse width modulation signal V a , a second pulse width modulation signal V b and a third pulse width modulation signal V c to drive the motor M. In this embodiment, the motor drive device 2 can be a three-phase drive device, such as a three-phase driver, a three-phase frequency converter, etc.

[0053] The conversion circuit 11 is connected to the processing circuit 12. The conversion circuit 11 includes a voltage dividing circuit 111, a differential circuit 112, a polarity correction circuit 113 and a polarity retention circuit 114. The voltage dividing circuit 111 is connected to the differential circuit 112. The differential circuit 112 is connected to the polarity correction circuit 113 and the polarity retention circuit 114. The voltage dividing circuit 111 receives the first pulse width modulation signal V a (as Figure 4A shown) and the second pulse width modulation signal V b (as Figure 4B shown), and divides the first pulse width modulation signal V a and the second pulse width modulation signal V b to generate a first voltage signal V an (as Figure 4C shown) and a second voltage signal V bn (as Figure 4D shown); the purpose of this step is to step down the high-voltage first pulse width modulation signal V a and the second pulse width modulation signal V b to generate the first voltage signal V an and the second voltage signal V bn that can be processed by the conversion circuit 11 and the processing circuit 12. In one embodiment, the voltage dividing circuit 111 can be a voltage divider or other similar circuits.

[0054] Then, the differential circuit 112 performs a differential operation to subtract the first voltage signal V an from the second voltage signal V bn to obtain a line-to-line voltage signal V ab (as Figure 4E shown).

[0055] Next, since the processing circuit 12 can only process positive voltages, the polarity correction circuit 113 performs polarity correction on the line-to-line voltage signal V with both positive and negative voltages ab to obtain an absolute value signal |V ab | that only has positive voltages (as Figure 4F shown). Additionally, in order to retain the polarity information of the line-to-line voltage signal V ab , the polarity retention circuit 114 rectifies the line-to-line voltage signal V ab to obtain a polarity signal V p (as Figure 4G shown). The polarity correction circuit 113 can be composed of several resistors and operational amplifiers, and its circuit structure should be well-known to those with ordinary knowledge in the art, so it will not be elaborated here. In one embodiment, the polarity retention circuit 114 can be a diode or other similar components. Then, the polarity correction circuit 113 and the polarity retention circuit 114 can transmit the aforementioned digital signals to the processing circuit 12.

[0056] The processing circuit 12 includes a digital integration module 121, a phase reconstruction module 122, and a line-to-phase conversion module 123. The digital integration module 121 is connected to the phase reconstruction module 122, and the phase reconstruction module 122 is connected to the line-to-phase conversion module 123. The digital integration module 121 receives the polarity signal V p and the absolute value signal |V ab |, and performs digital integration on the polarity signal V p and the absolute value signal |V ab | to obtain a first integration signal V t1 (as Figure 4H shown) and a second integration signal V t2 (as Figure 4I shown).

[0057] Since the absolute value signal |V ab | has been polarity-corrected by the polarity correction circuit 113, signal reconstruction is required through the polarity signal V ab with the polarity information of the line-to-line voltage signal V p . In this step, the phase reconstruction module 122 inverts the first integration signal V t1 through a comparator and logic gates to obtain an inverted signal V r (as Figure 4J shown). Then, the phase reconstruction module 122 further inverts the second integration signal V r according to the inverted signal V t2 to reconstruct the line-to-line voltage signal V ab . Through the above phase reconstruction algorithm, the phase reconstruction module 122 can, according to the first integration signal Vt1 and the second integral signal V t2 reconstruct the line-to-line voltage signal V ab , to obtain the reconstructed voltage signal V of the line-to-line voltage signal ab ’ (as Figure 4K shown).

[0058] Finally, the line-to-phase conversion module 123 performs a line-to-phase voltage conversion algorithm according to the reconstructed voltage signal V ab ’ to reconstruct the first pulse width modulation signal V a to obtain the reconstructed voltage signal V of the first pulse width modulation signal a ’ (as Figure 4L shown), thereby obtaining the true phase voltage value of the first pulse width modulation signal V a . The line-to-phase voltage conversion algorithm can be performed according to the phase relationship between the first pulse width modulation signal V a , the second pulse width modulation signal V b and the third pulse width modulation signal V c , as Figure 4M shown; therefore, the conversion relationship between the signals can be represented by the following equations (1) to (3):

[0059]

[0060]

[0061]

[0062] The above-mentioned line-to-phase voltage conversion algorithm should be well-known to those with ordinary knowledge in the field, so it will not be elaborated here.

[0063] In this way, the pulse width modulation signal voltage measurement device 1 can feedback the reconstructed voltage signal V a ’ of the first pulse width modulation signal to the motor drive device 2, so that instant voltage command compensation can be performed to improve the switching error caused by the dead time or for other applications.

[0064] In another embodiment, the pulse width modulation signal voltage measurement device 1 can also be directly integrated with the motor drive device 2, so that the pulse width modulation signal voltage measurement device 1 serves as one of the functional circuits of the motor drive device 2, enabling the motor drive device 2 to perform instant voltage command compensation to improve the switching error caused by the dead time.

[0065] If in order to further reduce the errors of the system, the pulse width modulation signal voltage measurement device 1 can be based on the second pulse width modulation signal V b and the third pulse width modulation signal V c (and the third pulse width modulation signal V c and the first pulse width modulation signal Va )Execute the above operation mechanism to obtain the second pulse width modulation signal V b of the reconstructed voltage signal (and the third pulse width modulation signal V c of the reconstructed voltage signal). In addition, if the motor driving device 2 is a two-phase driving device, the pulse width modulation signal can also be measured by the above mechanism.

[0066] In another embodiment, if the motor driving device 2 is a single-phase driving device, only the reconstructed voltage signal V ab ' of the line-to-line voltage signal needs to be obtained, and the subsequent line-to-phase voltage conversion can be omitted.

[0067] Of course, the above is only an example, and the components, their connection relationships, and cooperation relationships of the pulse width modulation signal voltage measurement device 1 can be adjusted according to actual needs, and the present disclosure is not limited thereto.

[0068] It is worth mentioning that the input voltage of existing voltage-frequency conversion chips is usually low voltage, so their applications are greatly limited. In addition, existing voltage-frequency converter chips are relatively expensive, so the cost will be greatly increased. On the contrary, according to the embodiments of the present disclosure, the pulse width modulation signal voltage measurement device can be implemented by a low-cost digital logic circuit to convert a high-voltage analog pulse width modulation signal into a digital signal for signal processing and signal reconstruction, so it can be more widely applied and the cost can be greatly reduced.

[0069] Also, according to the embodiments of the present disclosure, the measurement bandwidth of the pulse width modulation signal voltage measurement device depends on the operational amplifier used in the internal functional circuit, so it can ensure that sufficient measurement bandwidth is provided for pulse width modulation signal voltage measurement.

[0070] In addition, according to the embodiments of the present disclosure, the pulse width modulation signal voltage measurement device can instantaneously measure a high-voltage analog pulse width modulation signal through a voltage division circuit, and perform simple and effective digital signal processing through a polarity correction circuit, a differential circuit, and a processing circuit, so a large amount of computing resources can be saved and the measurement accuracy can be improved.

[0071] Furthermore, according to the embodiments of the present disclosure, the pulse width modulation signal voltage measurement device can perform digital integration on the output signal of the conversion circuit through the processing circuit, and then perform subsequent digital signal processing, so the measurement resolution can be effectively improved to provide excellent measurement performance.

[0072] Furthermore, according to an embodiment of the present disclosure, the pulse-width modulation signal voltage measurement device can be applied to various motor drive devices, such as single-phase drivers / frequency converters, two-phase drivers / frequency converters, three-phase drivers / frequency converters, etc., thus meeting the requirements of practical applications. As can be seen from the above, the pulse-width modulation signal voltage measurement device according to the embodiment of the present disclosure can indeed achieve excellent technical effects.

[0073] Please refer to Figure 5 , which is a flowchart of a pulse-width modulation signal voltage measurement method according to another embodiment of the present disclosure. As shown in the figure, the pulse-width modulation signal voltage measurement method of this embodiment may include the following steps:

[0074] Step S51: Divide the first pulse-width modulation signal and the second pulse-width modulation signal to generate a first voltage signal and a second voltage signal. This step can step down the high-voltage first pulse-width modulation signal and second pulse-width modulation signal to generate low-voltage first and second voltage signals.

[0075] Step S52: Subtract the second voltage signal from the first voltage signal to obtain a line-to-line voltage signal. This step performs a differential operation to subtract the second voltage signal from the first voltage signal to obtain a line-to-line voltage signal.

[0076] Step S53: Perform polarity correction on the line-to-line voltage signal to obtain an absolute value signal. This step performs polarity correction to convert the line-to-line voltage signal V ab with positive and negative voltages into an absolute value signal with only positive voltage.

[0077] Step S54: Rectify the line-to-line voltage signal to obtain a polarity signal. This step rectifies the line-to-line voltage signal to obtain a polarity signal to retain the polarity information of the line-to-line voltage signal.

[0078] Step S55: Perform digital integration on the polarity signal and the absolute value signal to obtain a first integration signal and a second integration signal. This step can perform digital integration on the polarity signal and the absolute value signal through internal functional modules of the processing module, such as a digital integrator, to obtain a first integration signal and a second integration signal.

[0079] Step S56: Perform a phase reconstruction algorithm according to the first integration signal and the second integration signal to reconstruct the line-to-line voltage signal to obtain a reconstructed voltage signal of the line-to-line voltage signal. This step can invert the first integration signal through a corresponding functional circuit to obtain an inverted signal, and then invert the second integration signal according to the inverted signal to reconstruct the line-to-line voltage signal.

[0080] Step S57: Perform a line-to-phase voltage conversion algorithm on the reconstructed voltage signal based on the line-to-line voltage signal to reconstruct the first pulse width modulation signal to obtain the reconstructed voltage signal of the first pulse width modulation signal. This step performs the line-to-phase voltage conversion algorithm according to the phase relationship among the first pulse width modulation signal, the second pulse width modulation signal, and the third pulse width modulation signal to obtain the reconstructed voltage signal of the first pulse width modulation signal.

[0081] Although the steps of the methods described in this disclosure are shown and described in a specific order, the order of operations of each method can be changed, certain steps can be performed in the reverse order, or certain steps can also be performed simultaneously with other steps. In another embodiment, different steps can be implemented in an intermittent and / or alternating manner.

[0082] Each element of the embodiments of the present invention (conversion circuit 11, functional circuits inside the conversion circuit 11, processing circuit 12, functional modules inside the processing circuit 12, and signal generator 21) can be implemented entirely in hardware, software, or an implementation including both hardware and software. In embodiments using software, the software can include, but is not limited to, firmware, resident software, microcode, one or more instructions, etc.

[0083] In summary, according to the embodiments of the present disclosure, the pulse width modulation signal voltage measurement device can be implemented by a low-cost digital logic circuit, which can convert a high-voltage analog pulse width modulation signal into a digital signal for signal processing and signal reconstruction. Therefore, it can be more widely applied and can significantly reduce costs.

[0084] Furthermore, according to the embodiments of the present disclosure, the measurement bandwidth of the pulse width modulation signal voltage measurement device depends on the operational amplifier used in the internal functional circuit, so it can ensure sufficient measurement bandwidth for pulse width modulation signal voltage measurement.

[0085] In addition, according to the embodiments of the present disclosure, the pulse width modulation signal voltage measurement device can instantaneously measure a high-voltage analog pulse width modulation signal through a voltage division circuit, and perform simple and effective digital signal processing through a polarity correction circuit, a differential circuit, and a processing circuit. Therefore, it can save a large amount of computing resources and improve measurement accuracy.

[0086] Moreover, according to the embodiments of the present disclosure, the pulse width modulation signal voltage measurement device can perform digital integration on the output signal of the conversion circuit through the processing circuit, and then perform subsequent digital signal processing. Therefore, it can effectively improve the measurement resolution to provide excellent measurement performance.

[0087] Furthermore, according to an embodiment of the present disclosure, the pulse width modulation signal voltage measuring device can be applied to various motor drive devices, such as single-phase drivers / frequency converters, two-phase drivers / frequency converters, three-phase drivers / frequency converters, etc., thus meeting the requirements of actual applications.

[0088] It can be seen that under the breakthrough of the prior art, the present disclosure has indeed achieved the desired improvement effect, and it is not easily conceived by those skilled in the art. Its progressiveness and practicality have clearly met the requirements for patent application, and a patent application is filed according to law.

[0089] The above is only illustrative and not restrictive. Any other equivalent modifications or changes made without departing from the spirit and scope of the present disclosure should be included in the appended patent application scope.

Claims

1. A pulse width modulation signal voltage measurement device, comprising: A conversion circuit that receives a first pulse width modulation signal and a second pulse width modulation signal from a motor drive device, and converts the first pulse width modulation signal and the second pulse width modulation signal into an absolute value signal and a polarity signal of a line-to-line voltage signal between the first pulse width modulation signal and the second pulse width modulation signal; and A processing circuit that converts the polarity signal and the absolute value signal into a first integral signal and a second integral signal, and then reconstructs the line-to-line voltage signal according to the first integral signal and the second integral signal to obtain a reconstructed voltage signal of the line-to-line voltage signal.

2. The pulse width modulation signal voltage measurement device according to claim 1, wherein the conversion circuit comprises a voltage dividing circuit and a differential circuit, the voltage dividing circuit divides the first pulse width modulation signal and the second pulse width modulation signal to generate a first voltage signal and a second voltage signal, and the differential circuit subtracts the first voltage signal from the second voltage signal to obtain the line-to-line voltage signal.

3. The pulse width modulation signal voltage measurement device according to claim 2, wherein the voltage dividing circuit is a voltage divider.

4. The pulse width modulation signal voltage measurement device according to claim 2, wherein the conversion circuit further comprises a polarity correction circuit that performs polarity correction on the line-to-line voltage signal to obtain the absolute value signal.

5. The pulse width modulation signal voltage measurement device according to claim 4, wherein the conversion circuit further comprises a polarity retention circuit that rectifies the line-to-line voltage signal to obtain the polarity signal.

6. The pulse width modulation signal voltage measurement device according to claim 5, wherein the polarity retention circuit comprises a diode.

7. The pulse width modulation signal voltage measurement device according to claim 1, wherein the processing circuit comprises a digital integration module that performs digital integration on the polarity signal and the absolute value signal to obtain the first integral signal and the second integral signal.

8. The pulse width modulation signal voltage measurement device according to claim 7, wherein the processing circuit further comprises a phase reconstruction module that performs a phase reconstruction algorithm according to the first integral signal and the second integral signal to reconstruct the line-to-line voltage signal, and obtains a reconstructed voltage signal of the line-to-line voltage signal.

9. The pulse width modulation signal voltage measurement device according to claim 1, wherein the processing circuit converts the reconstructed voltage signal of the line-to-line voltage signal into a reconstructed voltage signal of the first pulse width modulation signal according to the phase of the first pulse width modulation signal and the phase of the second pulse width modulation signal.

10. The pulse width modulation signal voltage measurement device according to claim 9, wherein the processing circuit comprises a line-to-phase conversion module that performs a line-to-phase voltage conversion algorithm according to the reconstructed voltage signal of the line-to-line voltage signal to reconstruct the first pulse width modulation signal to obtain a reconstructed voltage signal of the first pulse width modulation signal.

11. The pulse-width modulation signal voltage measuring device as described in claim 1, wherein the motor driving device is a driver or a frequency converter.

12. A motor driving device, comprising: a signal generator that generates a first pulse-width modulation signal and a second pulse-width modulation signal; and a pulse-width modulation signal voltage measuring device connected to the signal generator and comprising a conversion circuit and a processing circuit; Among them, the conversion circuit receives the first pulse-width modulation signal and the second pulse-width modulation signal, and converts the first pulse-width modulation signal and the second pulse-width modulation signal into an absolute value signal and a polarity signal of a line-to-line voltage signal between the first pulse-width modulation signal and the second pulse-width modulation signal, and the processing circuit converts the polarity signal and the absolute value signal into a first integral signal and a second integral signal, and then reconstructs the line-to-line voltage signal according to the first integral signal and the second integral signal to obtain a reconstructed voltage signal of the line-to-line voltage signal.

13. The motor driving device as described in claim 12, wherein the conversion circuit comprises a voltage dividing circuit and a differential circuit, the voltage dividing circuit divides the first pulse-width modulation signal and the second pulse-width modulation signal to generate a first voltage signal and a second voltage signal, and the differential circuit subtracts the first voltage signal from the second voltage signal to obtain the line-to-line voltage signal.

14. The motor driving device as described in claim 13, wherein the voltage dividing circuit is a voltage divider.

15. The motor driving device as described in claim 13, wherein the conversion circuit further comprises a polarity correction circuit that performs polarity correction on the line-to-line voltage signal to obtain the absolute value signal.

16. The motor driving device as described in claim 15, wherein the conversion circuit further comprises a polarity retention circuit that rectifies the line-to-line voltage signal to obtain the polarity signal.

17. The motor driving device as described in claim 16, wherein the polarity retention circuit comprises a diode.

18. The motor driving device as described in claim 12, wherein the processing circuit comprises a digital integration module that performs a digital integration on the polarity signal and the absolute value signal to obtain the first integral signal and the second integral signal.

19. The motor driving device as described in claim 18, wherein the processing circuit further comprises a phase reconstruction module that performs a phase reconstruction algorithm according to the first integral signal and the second integral signal to reconstruct the line-to-line voltage signal and obtain a reconstructed voltage signal of the line-to-line voltage signal.

20. The motor driving device as described in claim 12, wherein the processing circuit converts the reconstructed voltage signal of the line-to-line voltage signal into a reconstructed voltage signal of the first pulse-width modulation signal according to the phase of the first pulse-width modulation signal and the phase of the second pulse-width modulation signal.

21. The motor driving device as claimed in claim 20, wherein the processing circuit includes a line-to-phase conversion module, and the line-to-phase conversion module performs a line-to-phase voltage conversion algorithm according to the reconstructed voltage signal of the line-to-line voltage signal to reconstruct the first pulse width modulation signal to obtain the reconstructed voltage signal of the first pulse width modulation signal.

22. The motor driving device as claimed in claim 12, wherein the motor driving device is a driver or a frequency converter.

23. A method for measuring the voltage of a pulse width modulation signal, comprising: Converting a first pulse width modulation signal and a second pulse width modulation signal into an absolute value signal of a line-to-line voltage signal between the first pulse width modulation signal and the second pulse width modulation signal; Converting the line-to-line voltage signal into a polarity signal; Converting the polarity signal and the absolute value signal into a first integration signal and a second integration signal; and Reconstructing the line-to-line voltage signal according to the first integration signal and the second integration signal to obtain the reconstructed voltage signal of the line-to-line voltage signal.

24. The method for measuring the voltage of a pulse width modulation signal as claimed in claim 23, wherein the step of converting the first pulse width modulation signal and the second pulse width modulation signal into the absolute value signal of the line-to-line voltage signal between the first pulse width modulation signal and the second pulse width modulation signal further includes: Dividing the voltage of the first pulse width modulation signal and the second pulse width modulation signal to generate a first voltage signal and a second voltage signal; Subtracting the first voltage signal from the second voltage signal to obtain the line-to-line voltage signal; and Performing polarity correction on the line-to-line voltage signal to obtain the absolute value signal.

25. The method for measuring the voltage of a pulse width modulation signal as claimed in claim 23, wherein the step of converting the line-to-line voltage signal into the polarity signal further includes: Rectifying the line-to-line voltage signal to obtain the polarity signal.

26. The method for measuring the voltage of a pulse width modulation signal as claimed in claim 23, wherein the step of converting the polarity signal and the absolute value signal into the first integration signal and the second integration signal further includes: Performing digital integration on the polarity signal and the absolute value signal to obtain the first integration signal and the second integration signal.

27. The method for measuring the voltage of a pulse width modulation signal as claimed in claim 26, wherein the step of reconstructing the line-to-line voltage signal according to the first integration signal and the second integration signal to obtain the reconstructed voltage signal of the line-to-line voltage signal further includes: Performing a phase reconstruction algorithm according to the first integration signal and the second integration signal to reconstruct the line-to-line voltage signal to obtain the reconstructed voltage signal of the line-to-line voltage signal.

28. The method for measuring the voltage of a pulse width modulation signal as claimed in claim 23, further comprising: Converting the reconstructed voltage signal of the line-to-line voltage signal into the reconstructed voltage signal of the first pulse width modulation signal according to the phase of the first pulse width modulation signal and the phase of the second pulse width modulation signal.

29. The method for measuring the pulse width modulation signal voltage as described in claim 28, wherein converting the reconstructed voltage signal of the line-to-line voltage signal into the reconstructed voltage signal of the first pulse width modulation signal according to the phase of the first pulse width modulation signal and the phase of the second pulse width modulation signal further includes: Performing a line-to-phase voltage conversion algorithm on the reconstructed voltage signal of the line-to-line voltage signal to reconstruct the first pulse width modulation signal to obtain the reconstructed voltage signal of the first pulse width modulation signal.

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