Three-phase electric phase difference detection method

Abstract

The embodiment of the invention discloses a three-phase electric phase difference detection method, the method is applied to a three-phase electric phase difference detection system, the system comprises a step-down sampling module, a square wave shaping module, a phase difference detection module and an action module, and the method comprises the following steps: the step-down sampling module collects each phase voltage signal of three-phase electricity; the voltage of each phase voltage signal of the three-phase power is reduced and then sent to the square wave shaping module; the square wave shaping module shapes each phase voltage signal of the three-phase power into a square wave signal and then sends the square wave signal to the phase difference detection module; the phase difference detection module compares the square wave signals of any two phases to obtain a phase difference value; and the action module closes or disconnects the electric equipment switch according to the phase difference value.

Description

Technical Field

[0001] The present invention relates to the technical field of three-phase power phase difference detection, and particularly to a method for detecting the three-phase power phase difference. Background Art

[0002] Three-phase power is commonly used in various large motors in industrial production. The phase difference between the three phases of RST is 120 degrees. If the phase difference changes, situations such as motor jitter, increased noise, and reduced speed will occur.

[0003] The existing technology that can play a role in phase difference detection and protection is phase difference high-frequency protection. Its principle is to use high-frequency signals to compare the current phases at both ends. When the current phases at both ends of the line are the same or within the action angle range, the protection device completes a tripping action to protect the motor. Phase difference high-frequency protection is based on current detection, but detecting the phase difference through current has the following disadvantages: Existing equipment generally changes the current to control the change of motor power, but when changing the power, the current of the motor will change greatly, which will inevitably cause sampling errors, thereby reducing the detection accuracy of the phase difference. Summary of the Invention

[0004] To solve the problems existing in the prior art, one or more embodiments of this specification describe a method for detecting the three-phase power phase difference.

[0005] According to a first aspect, a method for detecting the three-phase power phase difference is provided. The method is applied to a three-phase power phase difference detection system, which includes a buck sampling module, a square wave shaping module, a phase difference detection module, and an action module. The first end of the square wave shaping module is electrically connected to the buck sampling module, the second end of the square wave shaping module is electrically connected to the first end of the phase difference detection module, and the second end of the phase difference detection module is electrically connected to the action module. The method includes: The buck sampling module collects the voltage signals of each phase of the three-phase power, and after bucking the voltage signals of each phase of the three-phase power, sends them to the square wave shaping module; The square wave shaping module shapes the voltage signals of each phase of the three-phase power into square wave signals and then sends them to the phase difference detection module; The phase difference detection module compares the square wave signals of any two phases to obtain a phase difference value; The action module closes or opens the switch of the electrical equipment according to the phase difference value.

[0006] Preferably, the step-down sampling module includes a first step-down sampling unit, a second step-down sampling unit, and a third step-down sampling unit. The first end of the first step-down sampling unit is electrically connected to the first-phase connection point of the electrical equipment. The first end of the second step-down sampling unit is electrically connected to the second-phase connection point of the electrical equipment. The first end of the third step-down sampling unit is electrically connected to the third-phase connection point of the electrical equipment. The second ends of the first step-down sampling unit, the second step-down sampling unit, and the third step-down sampling unit are electrically connected to the square-wave shaping module.

[0007] Preferably, the square-wave shaping module includes a first voltage comparator, a second voltage comparator, and a third voltage comparator. The first input port of the first voltage comparator is electrically connected to the first step-down sampling unit. The output port of the first voltage comparator is electrically connected to the phase difference detection module. The first input port of the second voltage comparator is electrically connected to the second step-down sampling unit. The output port of the second voltage comparator is electrically connected to the phase difference detection module. The first input port of the third voltage comparator is electrically connected to the third step-down sampling unit. The output port of the third voltage comparator is electrically connected to the phase difference detection module. The second input ports of the first voltage comparator, the second voltage comparator, and the third voltage comparator are grounded.

[0008] Preferably, the phase difference detection module includes a comparison unit and an output unit. The comparison unit is electrically connected to the first end of the output unit. The second end of the output unit is electrically connected to the action unit. The comparison unit is provided with a plurality of signal input points for receiving the square-wave signals sent by the square-wave shaping module.

[0009] Preferably, the comparison unit includes a first rising-edge trigger, a second rising-edge trigger, a third rising-edge trigger, a fourth rising-edge trigger, a fifth rising-edge trigger, and a sixth rising-edge trigger. The first pin of the first rising-edge trigger is electrically connected to the first square-wave unit, the fourth pin is electrically connected to the output unit, and the fifth pin is electrically connected to the fourth pin of the fourth rising-edge trigger. The first pin of the second rising-edge trigger is electrically connected to the second square-wave unit, the fourth pin is electrically connected to the output unit, and the fifth pin is electrically connected to the fourth pin of the fifth rising-edge trigger. The first pin of the third rising-edge trigger is electrically connected to the third square-wave unit, the fourth pin is electrically connected to the output unit, and the fifth pin is electrically connected to the fourth pin of the sixth rising-edge trigger. The first pin of the fourth rising-edge trigger is electrically connected to the second square-wave unit, the fifth pin is electrically connected to the output unit. The first pin of the fifth rising-edge trigger is electrically connected to the third square-wave unit, the fifth pin is electrically connected to the output unit. The first pin of the sixth rising-edge trigger is electrically connected to the first square-wave unit, and the fifth pin is electrically connected to the output unit.

[0010] Preferably, the output unit includes a first output device and an adjustable voltage block. The first output terminal of the first output device is electrically connected to the adjustable voltage block, and the second output terminal of the first output device is electrically connected to the fourth pin of the first rising-edge trigger.

[0011] Preferably, the adjustable voltage block includes an adjustable resistor and a voltage-dividing resistor. The first end of the adjustable resistor is connected to a power supply, the second end is connected in series with the first end of the voltage-dividing resistor, the second end of the voltage-dividing resistor is grounded, and the first output terminal of the first output device is electrically connected to the second end of the adjustable resistor.

[0012] Preferably, the adjustable voltage block further includes a voltage-stabilizing capacitor, and the voltage-stabilizing capacitor is connected in parallel with the voltage-dividing resistor.

[0013] Preferably, the action module includes a relay, a first triode, a second triode, a diode, and an action resistor. The first end of the action resistor is electrically connected to the output terminal of the first output device, the second end is electrically connected to the first end of the first triode, the second end of the first triode is electrically connected to the first end of the diode, the second end of the diode is electrically connected to the first end of the relay, the third end of the first triode is electrically connected to the first end of the second triode, the second end of the second triode is electrically connected to the second end of the relay, the third end of the second triode is grounded, and the relay is electrically connected to the electrical equipment.

[0014] Preferably, the action module further includes an action capacitor. The first end of the action capacitor is electrically connected to the first end of the first triode, and the second end of the action capacitor is electrically connected to the third end of the second triode.

[0015] The beneficial effects of the present invention are as follows: 1. The method provided in the embodiments of this specification obtains the phase differences between the phases of the three-phase power by collecting the voltages of each phase of the three-phase power, and closes or disconnects the switch of the electrical equipment according to the phase differences between the phases of the three-phase power, thereby avoiding the sampling error that occurs in the current sampling process, and further improving the detection accuracy of the phase differences. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 is a schematic diagram of the architecture of a three-phase power phase difference detection system in a specific implementation of this specification; Figure 2 is a schematic diagram of an implementation manner of a three-phase power phase difference detection system in a specific implementation of this specification; Figure 3 is a schematic flowchart of a three-phase power phase difference detection method in a specific implementation of this specification. Detailed Implementation Manner

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0019] In the following description, the terms "first" and "second" are only for the purpose of description and cannot be understood as indicating or implying relative importance. The following description provides multiple embodiments of the present application. Different embodiments can be replaced or combined. Therefore, the present application can also be considered to include all possible combinations of the same and / or different embodiments described. Thus, if one embodiment includes features A, B, and C, and another embodiment includes features B and D, then the present application should also be considered to include embodiments containing all other possible combinations of A, B, C, and D, although such an embodiment may not be explicitly described in the following content.

[0020] The following description provides examples and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made to the function and arrangement of the elements described without departing from the scope of the content of this application. Various processes or components may be appropriately omitted, substituted, or added to each example. For example, the methods described may be performed in a different order than the order described, and various steps may be added, omitted, or combined. In addition, the features described for some examples may be combined into other examples.

[0021] Please refer to Figure 1 、 Figure 2 , Figure 1 which shows a schematic diagram of the architecture of a three-phase electricity phase difference detection system provided by an embodiment of this specification. Figure 2 which shows a schematic diagram of an implementation manner of a three-phase electricity phase difference detection system provided by an embodiment of this specification: As Figure 1 、 Figure 2 shown, the architecture of the three-phase electricity phase difference detection system includes a step-down sampling module 100, a square wave shaping module 200, a phase difference detection module 300, and an action module 400. The first end of the square wave shaping module 200 is electrically connected to the step-down sampling module 100, the second end of the square wave shaping module 200 is electrically connected to the first end of the phase difference detection module 300, the second end of the phase difference detection module 300 is electrically connected to the action module 400, and the step-down sampling module 100 is electrically connected to the electrical equipment, so as to collect voltage signals representing the voltage values and phases of each phase of the three-phase electricity of the electrical equipment, denoted as the R-phase voltage signal, the S-phase voltage signal, and the T-phase voltage signal. The step-down sampling module 100 steps down the collected voltage signals and sends them to the square wave shaping module 200. The square wave shaping module 200 shapes the voltage signals of each phase into square wave signals (denoted as the R-phase square wave signal, the S-phase square wave signal, and the T-phase square wave signal), and then sends the square wave signals to the phase difference detection module 300. The phase difference detection module 300 obtains the phase difference value by comparing the square waves of each phase, and then sends the phase difference value to the action module 400. The action module 400 closes or opens the electrical equipment switch according to the phase difference value. Compared with the prior art, the phase difference is detected by current, but existing devices generally change the current to control the change of the motor power. However, when changing the power, the current of the motor will change greatly, which will inevitably cause sampling errors, thereby reducing the detection accuracy of the phase difference. In this application, the phase difference between each phase of the three-phase electricity is obtained by collecting the voltage of each phase of the three-phase electricity, and the electrical equipment switch is closed or opened according to the phase difference between each phase of the three-phase electricity, thereby avoiding the sampling errors that occur in the current sampling process, and further improving the detection accuracy of the phase difference.

[0022] In an implementable manner, the buck sampling module 100 includes a plurality of buck sampling units. Specifically, there are 3 buck sampling units, namely the first buck sampling unit 110, the second buck sampling unit 120, and the third buck sampling unit 130. The first end of the first buck sampling unit 110 is electrically connected to the first-phase connection point of the electrical device to collect the R-phase voltage signal. The first end of the second buck sampling unit 120 is electrically connected to the second-phase connection point of the electrical device to collect the S-phase voltage signal. The first end of the third buck sampling unit 130 is electrically connected to the third-phase connection point of the electrical device to collect the T-phase voltage signal. The second ends of the first buck sampling unit 110, the second buck sampling unit 120, and the third buck sampling unit 130 are electrically connected to the square wave shaping module 200. First, the collected voltage is stepped down through a buck resistor, and the voltage can be reduced to a safe range for the analysis and processing of subsequent modules.

[0023] Specifically, the buck sampling unit includes a plurality of buck resistors connected in series.

[0024] In an implementable manner, the square wave shaping module 200 includes a plurality of square wave units. The number of square wave units is equal to the number of buck sampling units, namely the first square wave unit 210, the second square wave unit 220, and the third square wave unit 230. The phase difference detection module 300 is provided with a first input terminal, a second input terminal, and a third input terminal. The first end of the first square wave unit 210 is electrically connected to the second end of the first buck sampling unit 110. The first end of the second square wave unit 220 is electrically connected to the second end of the second buck sampling unit 120. The first end of the second square wave unit 220 is electrically connected to the second end of the second buck sampling unit 120. The second ends of the first square wave unit 210, the second square wave unit 220, and the third square wave unit 230 are electrically connected to the phase difference detection module 300. Each square wave unit shapes the collected voltage signal into a square wave signal and then inputs it to the phase difference detection module 300 for comparison. The phase difference detection module 300 obtains the phase difference value representing the phase difference between each phase after comparison according to the square wave signal. Shaping the voltage signal into a square wave signal enables subsequent signals to be independent of the limitations of circuit element parameters, thereby improving the anti-interference ability and stability of the circuit.

[0025] Furthermore, the square wave unit includes a voltage comparator. The first input port of the voltage comparator is electrically connected to the buck sampling module 100. The second input port of the voltage comparator is grounded. The output port of the voltage comparator is electrically connected to the phase difference detection module 300. Among them, the voltage comparator can specifically be an LM311 comparator.

[0026] In an implementable manner, the phase difference detection module 300 includes a comparison unit 310 and an output unit 320. The comparison unit 310 is provided with three signal input points, and each signal input point receives a square wave signal of a certain phase. The first end of the comparison unit 310 is electrically connected to the square wave shaping module 200, the second end of the comparison unit 310 is electrically connected to the first end of the output unit 320, and the second end of the output unit 320 is electrically connected to the action module 400.

[0027] Further, the comparison unit 310 includes a first rising-edge flip-flop 311, a second rising-edge flip-flop 312, a third rising-edge flip-flop 313, a fourth rising-edge flip-flop 314, a fifth rising-edge flip-flop 315, and a sixth rising-edge flip-flop 316. Signal input points are provided on the first rising-edge flip-flop 311, the second rising-edge flip-flop 312, and the third rising-edge flip-flop 313. The second and third pins of the first rising-edge flip-flop 311, the second rising-edge flip-flop 312, the third rising-edge flip-flop 313, the fourth rising-edge flip-flop 314, the fifth rising-edge flip-flop 315, and the sixth rising-edge flip-flop 316 are connected to a 5V power supply. The first pin (i.e., the first input terminal) of the first rising-edge flip-flop 311 is electrically connected to the first square-wave unit 210, the fourth pin is electrically connected to the output unit 320, and the fifth pin is electrically connected to the fourth pin of the fourth rising-edge flip-flop 314. The first pin (i.e., the second input terminal) of the second rising-edge flip-flop 312 is electrically connected to the second square-wave unit 220, the fourth pin is electrically connected to the output unit 320, and the fifth pin is electrically connected to the fourth pin of the fifth rising-edge flip-flop 315. The first pin of the third rising-edge flip-flop 313 is electrically connected to the third square-wave unit 230, the fourth pin is electrically connected to the output unit 320, and the fifth pin is electrically connected to the fourth pin of the sixth rising-edge flip-flop 316. The first pin of the fourth rising-edge flip-flop 314 is electrically connected to the second square-wave unit 220, the fifth pin is electrically connected to the output unit 320. The first pin of the fifth rising-edge flip-flop 315 is electrically connected to the third square-wave unit 230, and the fifth pin is electrically connected to the output unit 320. The first pin of the sixth rising-edge flip-flop 316 is electrically connected to the first square-wave unit 210, and the fifth pin is electrically connected to the output unit 320. In this way, the first rising-edge flip-flop 311 conducts when the R phase leads the S phase. The conduction time and duty cycle of the square wave output by the first rising-edge flip-flop 311 represent the phase difference between the R phase and the S phase. The second rising-edge flip-flop 312 conducts when the S phase leads the T phase. The conduction time and duty cycle of the square wave output by the second rising-edge flip-flop 312 represent the phase difference between the S phase and the T phase. The third rising-edge flip-flop 313 conducts when the T phase leads the R phase. The conduction time and duty cycle of the square wave output by the third rising-edge flip-flop 313 represent the phase difference between the T phase and the R phase. By setting multiple rising-edge flip-flops, different-phase square-wave signals are compared using the multiple rising-edge flip-flops to obtain square-wave signals representing the phase differences of each phase. The square-wave signals output a voltage value, realizing the conversion of the phase differences between each phase into the duty cycle of the square-wave signals and then feeding back to the subsequent module in the form of a voltage value, thus facilitating the analysis and processing of the subsequent module.

[0028] Specifically, the first rising-edge flip-flop 311 can adopt a CD4013 rising-edge flip-flop.

[0029] Further, the output unit 320 includes a first output device 321, a second output device 322, a third output device 323, and an adjustable voltage block 324. The first output terminals of the first output device 321, the second output device 322, and the third output device 323 are all electrically connected to the adjustable voltage block 324. The second output terminal of the first output device 321 is electrically connected to the fourth pin of the first rising edge trigger 311. The second output terminal of the second output device 322 is electrically connected to the fourth pin of the second rising edge trigger 312. The second output terminal of the third output device 323 is electrically connected to the fourth pin of the third rising edge trigger 313. The output terminals of the first output device 321, the second output device 322, and the third output device 323 are electrically connected to the action module 400.

[0030] Preferably, there are 3 adjustable voltage blocks 324. The first output device 321, the second output device 322, and the third output device 323 are respectively electrically connected to different adjustable voltage blocks 324. Taking the adjustable voltage block 324 connected to the first output device 321 as an example: The adjustable voltage block 324 includes an adjustable resistor 3241 and a voltage dividing resistor 3242. One end of the adjustable resistor 3241 is connected to a power supply, and the second end is connected in series with one end of the voltage dividing resistor 3242. The second end of the voltage dividing resistor 3242 is grounded. The first output terminal of the first output device 321 is electrically connected to the second end of the adjustable resistor 3241. The output device compares the voltages at the two input terminals. One of the input terminal voltages is the voltage value at the second end of the adjustable resistor 3241, and the other input terminal voltage is the voltage value represented by the square wave signal output by the comparison unit 310. The output device calculates the difference between the two input terminal voltage values, and judges whether the phase differences of each phase of the three-phase electricity meet the requirements based on the difference between the two input terminals. If the phase differences of each phase of the three-phase electricity meet the requirements, when the output device outputs a high level, the subsequent action module 400 will act, thereby powering on the electrical equipment. If the phase difference between any two phases does not meet the requirements, when the output device outputs a low level, the subsequent action module 400 will act, thereby powering off the electrical equipment. By adjusting the resistance value of the adjustable resistor 3241, the voltage value at the second end of the adjustable resistor 3241 is adjusted, and then the phase difference range for the electrical equipment to maintain operation is adjusted, thereby improving the flexibility of the entire three-phase electricity phase difference detection system.

[0031] Further, the adjustable voltage block 324 further includes a voltage stabilizing capacitor 3243. The voltage stabilizing capacitor 3243 is connected in parallel with the voltage dividing resistor 3242. By setting the voltage stabilizing capacitor 3243, the interference in the circuit is filtered out, and thus the stability of the circuit is improved.

[0032] In an implementable manner, the action module 400 includes a relay 410, a first triode 420, a second triode 430, a diode 440, an action resistor 450, and an action capacitor 460. The first end of the action resistor 450 is electrically connected to the output end of the first outputter 321. The second end of the action resistor 450 is electrically connected to the first end of the action capacitor 460. The second end of the action capacitor 460 is grounded. The first end of the first triode 420 is electrically connected to the second end of the action resistor 450. The second end of the first triode 420 is electrically connected to the first end of the diode 440. The second end of the diode 440 is electrically connected to the first end of the relay 410. The third end of the first triode 420 is electrically connected to the first end of the second triode 430. The second end of the second triode 430 is electrically connected to the second end of the relay 410. The third end of the second triode 430 is grounded. The relay 410 is electrically connected to the electrical equipment. When receiving the high level output by the outputter, the first triode 420 and the second triode 430 are turned on, thereby enabling the coil of the relay 410 to be powered on, the switch to be closed, and the electrical equipment to be powered on. When receiving the low level output by the outputter, the first triode 420 and the second triode 430 are turned off, the relay 410 loses power, the switch is opened, and the user equipment is powered off.

[0033] Those skilled in the art can clearly understand that the technical solutions of the embodiments of the present application can be implemented by means of software and / or hardware. The "units" and "modules" in this specification refer to software and / or hardware that can independently complete or cooperate with other components to complete specific functions, where the hardware can be, for example, a Field-Programmable Gate Array (FPGA), an Integrated Circuit (IC), etc.

[0034] Each processing unit and / or module of the embodiments of the present application can be implemented by an analog circuit that implements the functions described in the embodiments of the present application, or can be implemented by software that executes the functions described in the embodiments of the present application.

[0035] Next, please refer to Figure 3 , Figure 3 which shows a schematic flowchart of a three-phase electric phase difference detection method provided by an embodiment of this specification.

[0036] Refer to Figure 3 ,the three-phase electric phase difference detection method includes: S301. The buck sampling module collects the voltage signals of each phase of the three-phase electricity, and after stepping down the voltage signals of each phase of the three-phase electricity, sends them to the square wave shaping module; S302. The square wave shaping module shapes the voltage signals of each phase of the three-phase electricity into square wave signals and then sends them to the phase difference detection module; S303. The phase difference detection module obtains a phase difference value after comparing the square wave signals of any two phases; S304. The action module closes or opens the switch of the electrical equipment according to the phase difference value.

[0037] The above are only exemplary embodiments of the present disclosure, and the scope of the present disclosure cannot be limited thereby. That is, any equivalent changes and modifications made in accordance with the teachings of the present disclosure still fall within the scope covered by the present disclosure. Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include known common knowledge or conventional technical means in the technical field not recorded in the present disclosure. The specification and embodiments are only regarded as exemplary, and the scope and spirit of the present disclosure are defined by the claims.

Claims

1. A three-phase electrical phase difference detection method, characterized in that: The method is applied to a three-phase electrical phase difference detection system, the system comprising a voltage reduction sampling module, a square wave shaping module, a phase difference detection module and an action module, the first end of the square wave shaping module is electrically connected to the voltage reduction sampling module, the second end of the square wave shaping module is electrically connected to the first end of the phase difference detection module, the second end of the phase difference detection module is electrically connected to the action module, the method comprises: The voltage reduction sampling module collects the voltage signals of each phase of the three-phase electricity, and sends the voltage signals of each phase of the three-phase electricity to the square wave shaping module after reducing the voltage. The square wave shaping module shapes the voltage signals of each phase of the three-phase electricity into square wave signals and sends them to the phase difference detection module; The phase difference detection module compares the square wave signals of any two phases to obtain a phase difference value; The action module closes the switch of the electric device or opens the switch of the electric device according to the phase difference value.

2. A three-phase electrical phase difference detection method according to claim 1, characterized in that: The step-down sampling module includes a first step-down sampling unit, a second step-down sampling unit and a third step-down sampling unit, wherein the first end of the first step-down sampling unit is electrically connected to the first phase connection point of the electrical equipment, the first end of the second step-down sampling unit is electrically connected to the second phase connection point of the electrical equipment, the first end of the third step-down sampling unit is electrically connected to the third phase connection point of the electrical equipment, and the second ends of the first step-down sampling unit, the second step-down sampling unit and the third step-down sampling unit are electrically connected to the square wave shaping module.

3. A three-phase electrical phase difference detection method according to claim 2, characterized in that: The square wave shaping module includes a first voltage comparator, a second voltage comparator and a third voltage comparator, wherein the first input port of the first voltage comparator is electrically connected to the first voltage reduction sampling unit, the output port of the first voltage comparator is electrically connected to the phase difference detection module, the first input port of the second voltage comparator is electrically connected to the second voltage reduction sampling unit, the output port of the second voltage comparator is electrically connected to the phase difference detection module, the first input port of the third voltage comparator is electrically connected to the third voltage reduction sampling unit, the output port of the third voltage comparator is electrically connected to the phase difference detection module, and the second input ports of the first voltage comparator, the second voltage comparator and the third voltage comparator are grounded.

4. A three-phase electrical phase difference detection method according to claim 1, characterized in that: The phase difference detection module includes a comparison unit and an output unit, the comparison unit is electrically connected to a first end of the output unit, and a second end of the output unit is electrically connected to the action unit. The comparison unit is provided with a plurality of signal input points, and the signal input points are used to receive the square wave signal sent by the square wave shaping module.

5. A three-phase electrical phase difference detection method according to claim 4, characterized in that: The comparison unit includes a first rising edge trigger, a second rising edge trigger, a third rising edge trigger, a fourth rising edge trigger, a fifth rising edge trigger and a sixth rising edge trigger, wherein the first pin of the first rising edge trigger is electrically connected to the first square wave unit, the fourth pin is electrically connected to the output unit, and the fifth pin is electrically connected to the fourth pin of the fourth rising edge trigger, the first pin of the second rising edge trigger is electrically connected to the second square wave unit, the fourth pin is electrically connected to the output unit, and the fifth pin is electrically connected to the fourth pin of the fifth rising edge trigger, the first pin of the third rising edge trigger is electrically connected to the third wave unit, the fourth pin is electrically connected to the output unit, and the fifth pin is electrically connected to the fourth pin of the sixth rising edge trigger, the first pin of the fourth rising edge trigger is electrically connected to the second square wave unit, and the fifth pin is electrically connected to the output unit, the first pin of the fifth rising edge trigger is electrically connected to the third wave unit, and the fifth pin is electrically connected to the output unit, the first pin of the sixth rising edge trigger is electrically connected to the first square wave unit, and the fifth pin is electrically connected to the output unit.

6. A three-phase electrical phase difference detection method according to claim 5, characterized in that: The output unit includes a first follower and an adjustable voltage block, wherein a first output end of the first follower is electrically connected to the adjustable voltage block, and a second output end of the first follower is electrically connected to a fourth pin of the first rising edge trigger.

7. A three-phase electrical phase difference detection method according to claim 6, characterized in that: The adjustable voltage block includes an adjustable resistor and a voltage divider resistor. The first end of the adjustable resistor is connected to a power supply, and the second end is connected in series with the first end of the voltage divider resistor. The second end of the voltage divider resistor is grounded. The first output end of the first output device is electrically connected to the second end of the adjustable resistor.

8. A three-phase electrical phase difference detection method according to claim 7, characterized in that: The adjustable voltage block further includes a voltage stabilizing capacitor, which is connected in parallel with the voltage dividing resistor.

9. A three-phase electrical phase difference detection method according to claim 5, characterized in that: The action module includes a relay, a first transistor, a second transistor, a diode and an action resistor, wherein the first end of the action resistor is electrically connected to the output end of the first output device, the second end of the action resistor is electrically connected to the first end of the first transistor, the second end of the first transistor is electrically connected to the first end of the diode, the second end of the diode is electrically connected to the first end of the relay, the third end of the first transistor is electrically connected to the first end of the second transistor, the second end of the second transistor is electrically connected to the second end of the relay, the third end of the second transistor is grounded, and the relay is electrically connected to an electrical device.

10. A three-phase electrical phase difference detection method according to claim 9, characterized in that: The action module further includes an action capacitor, a first end of the action capacitor is electrically connected to the first end of the first transistor, and a second end of the action capacitor is electrically connected to the third end of the second transistor.

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