Three-phase power supply open-phase detection circuit and method, and electric equipment

Abstract

The invention provides a three-phase power supply open-phase detection circuit and method and electric equipment, and relates to the technical field of three-phase power supplies, and the three-phase power supply open-phase detection circuit comprises an acquisition module, a comparison module and a judgment module. The voltage value of each first voltage signal is compared with a preset voltage value through a comparison module, a second voltage signal corresponding to the first voltage signal is output according to a comparison result corresponding to the first voltage signal, under the condition that the voltage value is smaller than the preset voltage value, the second voltage signal is a first level, and under the condition that the voltage value is smaller than the preset voltage value, the second voltage signal is a second level; and then the judgment module determines the phase loss of the three-phase power supply under the condition that the number of the second voltage signals of the first level is greater than 1 in the second voltage signals, so that the phase loss detection of the three-phase power supply is realized, manual detection is not needed, and the working efficiency is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of three-phase power supply, and specifically relates to a three-phase power supply phase loss detection circuit and method, and electrical equipment. Background Art

[0002] The three-phase power supply is a power supply composed of three AC potentials with the same frequency, equal amplitude, and phase difference of 120 degrees. The three-phase power supply supplies power to the load through a rectifier bridge. In the case of a phase loss in the three-phase power supply, the load power supply is abnormal, resulting in abnormal load operation. Therefore, it is necessary to perform phase loss detection on the three-phase power supply to promptly discover and handle the phase loss fault.

[0003] It should be noted that the three-phase power supply includes three-phase power output, and phase loss of the three-phase power supply refers to a failure or interruption of one or more phases of the three-phase power supply.

[0004] In the prior art, workers manually detect the phase loss of three-phase power supply, which has low work efficiency. Summary of the invention

[0005] The present application aims to provide a three-phase power supply phase loss detection circuit and method, and electrical equipment, which at least solves the problem of low work efficiency in the prior art due to the manual phase loss detection of the three-phase power supply by the staff.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] In a first aspect, an embodiment of the present application provides a three-phase power supply phase loss detection circuit, including: an acquisition module, a comparison module and a judgment module;

[0008] The acquisition module is used to be electrically connected to the three-phase power supply and the rectifier bridge respectively, and to acquire the first voltage signal of each phase of the three-phase power supply input to the rectifier bridge; the rectifier bridge is electrically connected to the three-phase power supply;

[0009] The comparison module is electrically connected to the acquisition module and the judgment module respectively, and is used to compare the voltage value of each of the first voltage signals with a preset voltage value respectively, and output a second voltage signal corresponding to the first voltage signal according to the comparison result corresponding to the first voltage signal; when the voltage value is less than the preset voltage value, the second voltage signal is a first level; when the voltage value is greater than the preset voltage value, the second voltage signal is a second level; the first level is opposite to the second level;

[0010] The judgment module is used to determine that the three-phase power supply is missing a phase when the number of the second voltage signals of the first level in the second voltage signals is greater than one.

[0011] In a second aspect, an embodiment of the present application further provides an electrical device, comprising the three-phase power supply phase loss detection circuit as described in the first aspect.

[0012] In a third aspect, an embodiment of the present application further provides a method for detecting a phase loss in a three-phase power supply, the method comprising:

[0013] Collecting a first voltage signal of each phase of a three-phase power supply input to a rectifier bridge; the three-phase power supply is electrically connected to the rectifier bridge;

[0014] Compare the voltage value of each of the first voltage signals with a preset voltage value respectively, and generate a second voltage signal corresponding to the first voltage signal according to the comparison result corresponding to the first voltage signal; when the voltage value is less than the preset voltage value, the second voltage signal is at a first level; when the voltage value is greater than the preset voltage value, the second voltage signal is at a second level; the first level is opposite to the second level;

[0015] When the number of the second voltage signals of the first level in the second voltage signals is greater than one, it is determined that the three-phase power supply is phase-lost.

[0016] In an embodiment of the present application, the first voltage signal of each phase of the three-phase power supply input rectifier bridge is collected by the acquisition module, and then the voltage value of each first voltage signal is compared with the preset voltage value by the comparison module, and the second voltage signal corresponding to the first voltage signal is output according to the comparison result corresponding to the first voltage signal, wherein, when the voltage value is less than the preset voltage value, the second voltage signal is of the first level, and then, when the number of the second voltage signals of the first level in the second voltage signal is greater than 1, the judgment module determines that the three-phase power supply is phase-lost, so as to realize the phase-lost detection of the three-phase power supply without manual detection, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 It is a schematic diagram of a three-phase power supply phase loss detection circuit provided in an embodiment of the present application;

[0019] Figure 2 It is a specific schematic diagram of a three-phase power supply phase loss detection circuit provided in an embodiment of the present application;

[0020] Figure 3is a schematic diagram of a voltage curve of a first voltage signal provided in an embodiment of the present application;

[0021] Figure 4 is a schematic diagram of a voltage curve of a second voltage signal provided in an embodiment of the present application;

[0022] Figure 5 is a schematic diagram of a voltage curve of another first voltage signal provided in an embodiment of the present application;

[0023] Figure 6 is a schematic diagram of a voltage curve of another second voltage signal provided in an embodiment of the present application;

[0024] Figure 7 is a schematic diagram of a voltage curve of another first voltage signal provided in an embodiment of the present application;

[0025] Figure 8 This is a schematic diagram of a three-phase power supply phase loss detection process provided by an embodiment of the present application;

[0026] Fig. 9 It is a flowchart of the steps of a three-phase power supply phase loss detection method provided in an embodiment of the present application.

[0027] Reference numerals:

[0028] 10-acquisition module; 11-acquisition submodule; 20-comparison module; 30-judgment module; 31-judgment submodule; 40-rectifier bridge; 41-bridge arm; 401-first end of the rectifier bridge; 402-second end of the rectifier bridge; 50-three-phase power supply; 501-first output end; 60-load; R1-first resistor; R2-second resistor; R3-third resistor; R4-fourth resistor; D1-first diode; D2-second diode; P1-operational amplifier; U1-analog-to-digital converter; U2-microcontroller unit; F1-inverter; M1-first AND gate device; M2-second AND gate device. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0031] Reference Figure 1 The embodiment of the present application provides a three-phase power supply 50 phase loss detection circuit, including: an acquisition module 10, a comparison module 20 and a judgment module 30; the acquisition module 10 is used to be electrically connected to the three-phase power supply 50 and the rectifier bridge 40 respectively, and to acquire the first voltage signal of each phase of the three-phase power supply 50 input to the rectifier bridge 40; the rectifier bridge 40 is electrically connected to the three-phase power supply 50; the comparison module 20 is electrically connected to the acquisition module 10 and the judgment module 30 respectively, and the comparison module 20 is used to compare the voltage value of each first voltage signal with a preset voltage value respectively, and output a second voltage signal corresponding to the first voltage signal according to the comparison result corresponding to the first voltage signal; when the voltage value is less than the preset voltage value, the second voltage signal is a first level; when the voltage value is greater than the preset voltage value, the second voltage signal is a second level; the first level is opposite to the second level; the judgment module 30 is used to determine that the three-phase power supply 50 is phase-lost when the number of second voltage signals of the first level in the second voltage signal is greater than 1.

[0032] It should be noted that the three-phase power supply 50 includes three-phase power output, and the first voltage signal of the three-phase power supply 50 input to the rectifier bridge 40 includes the first voltage signal of the first phase of the three-phase power supply 50 input to the rectifier bridge 40, the first voltage signal of the second phase of the three-phase power supply 50 input to the rectifier bridge 40, and the first voltage signal of the third phase of the three-phase power supply 50 input to the rectifier bridge 40.

[0033] The load 60 is a device powered by the three-phase power supply 50 , for example, the load 60 may be a motor, a compressor, etc.

[0034] The second voltage signal output by the comparison module 20 includes a second voltage signal corresponding to the first voltage signal of the first phase input rectifier bridge 40 of the three-phase power supply 50, a second voltage signal corresponding to the first voltage signal of the second phase input rectifier bridge 40 of the three-phase power supply 50, and a second voltage signal corresponding to the first voltage signal of the third phase input rectifier bridge 40 of the three-phase power supply 50.

[0035] The case where the number of the second voltage signals at the first level is greater than one includes the case where the number of the second voltage signals at the first level is two and the case where the number of the second voltage signals at the first level is three.

[0036] Specifically, in some embodiments, the first level is a low level (represented by binary 0), and the second level is a high level (represented by binary 1).

[0037] In the embodiment of the present application, the first voltage signal of each phase of the three-phase power supply 50 input to the rectifier bridge 40 is collected by the acquisition module 10, and then the voltage value of each first voltage signal is compared with the preset voltage value by the comparison module 20, and according to the comparison result corresponding to the first voltage signal, the second voltage signal corresponding to the first voltage signal is output, wherein, when the voltage value is less than the preset voltage value, the second voltage signal is of the first level, and then, when the number of the second voltage signals of the first level in the second voltage signal is greater than 1, the judgment module 30 determines that the three-phase power supply 50 is phase-lost, so as to realize the phase-lost detection of the three-phase power supply 50, and no manual detection is required, thereby improving work efficiency.

[0038] Optionally, refer to Figure 2 In some embodiments, the acquisition module 10 includes three acquisition sub-modules 11; the acquisition sub-modules 11 correspond one-to-one to the first output terminals 501 of the phases of the three-phase power supply 50; the acquisition sub-modules 11 are electrically connected to the first output terminals 501 corresponding to the acquisition sub-module 11 and the first terminal 401 of the rectifier bridge 40, respectively, and the acquisition sub-module 11 is used to acquire a first voltage signal between the first output terminal 501 corresponding to the acquisition sub-module 11 and the first terminal 401 of the rectifier bridge 40; wherein the first terminal 401 of the rectifier bridge 40 is electrically connected to the negative electrode of the load 60, and the second terminal 402 of the rectifier bridge 40 is electrically connected to the positive electrode of the load 60; the rectifier bridge 40 also includes three first input terminals, and the first input terminals correspond one-to-one to the first output terminals 501; the first input terminals are electrically connected to the first output terminals 501 corresponding to the first input terminals.

[0039] It should be noted that, since the three-phase power supply 50 includes three-phase power outputs, the three-phase power supply 50 includes three first output terminals 501 .

[0040] In the embodiment of the present application, the first voltage signal between the first output terminal 501 corresponding to the acquisition submodule 11 and the first terminal 401 of the rectifier bridge 40 is acquired by the acquisition submodule 11, so that the comparison module 20 compares the voltage value of each first voltage signal with the preset voltage value respectively, and outputs the second voltage signal corresponding to the first voltage signal according to the comparison result corresponding to the first voltage signal.

[0041] Optionally, in some embodiments, the acquisition submodule 11 includes a first resistor R1 and a second resistor R2; in the acquisition submodule 11, the first end of the first resistor R1 is electrically connected to the first output end 501 corresponding to the acquisition submodule 11, and the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2; the second end of the second resistor R2 is electrically connected to the first end 401 of the rectifier bridge 40.

[0042] In the embodiment of the present application, the first resistor R1 and the second resistor R2 are both voltage-dividing resistors. The voltage between the first output terminal 501 corresponding to the acquisition submodule 11 and the first terminal 401 of the rectifier bridge 40 is divided and collected by the first resistor R1 and the second resistor R2 in the acquisition submodule 11, thereby obtaining a first voltage signal between the first output terminal 501 corresponding to the acquisition submodule 11 and the first terminal 401 of the rectifier bridge 40.

[0043] Optionally, in some embodiments, the comparison module 20 includes three operational amplifiers P1, a third resistor R3, a fourth resistor R4 and an analog-to-digital converter U1; the acquisition module 10 includes three second output terminals, the operational amplifier P1 corresponds to the second output terminals one by one; the output terminal of the operational amplifier P1 corresponds to the input terminal of the analog-to-digital converter U1 one by one; the input terminal of the analog-to-digital converter U1 corresponds to the output terminal of the analog-to-digital converter U1 one by one; the output terminal of the analog-to-digital converter U1 corresponds to the input terminal of the judgment module 30 one by one; the third resistor R The first end of the third resistor R3 is used to be electrically connected to an external power supply, the second end of the third resistor R3 is electrically connected to the inverting input end of each of the operational amplifiers P1 and the first end of the fourth resistor R4 respectively; the second end of the fourth resistor R4 is grounded; the non-inverting input end of the operational amplifier P1 is electrically connected to the second output end corresponding to the operational amplifier P1, the output end of the operational amplifier P1 is electrically connected to the input end of the analog-to-digital converter U1 corresponding to the operational amplifier P1; the output end of the analog-to-digital converter U1 is electrically connected to the input end of the judgment module 30 corresponding to the analog-to-digital converter U1.

[0044] It should be noted that the positive electrode of each operational amplifier P1 is electrically connected to the external power supply, and the negative electrode of each operational amplifier P1 is grounded; the third resistor R3 and the fourth resistor R4 are both voltage-dividing resistors.

[0045] The analog-to-digital converter U1 (ADC) is an analog-to-digital converter, and the analog-to-digital converter U1 is used to convert an analog signal into a digital signal.

[0046] The second voltage signal outputted by the output terminal of the analog-to-digital converter U1 corresponds one-to-one to the third voltage signal acquired by the input terminal of the analog-to-digital converter U1.

[0047] Specifically, in some embodiments, the third resistor R3 is a variable resistor, and adjusting the resistance value of the third resistor R3 is helpful to adjust the preset voltage value, thereby adjusting the sensitivity of the phase loss detection.

[0048] In an embodiment of the present application, a first voltage signal corresponding to the operational amplifier P1 is obtained through the operational amplifier P1, and the voltage value of the first voltage signal corresponding to the operational amplifier P1 is compared with the voltage value of the fourth resistor R4, and a third voltage signal is output based on the comparison result, and then the third voltage signal is converted into a second voltage signal through the analog-to-digital converter U1, so that the judgment module 30 determines that the three-phase power supply 50 is missing a phase when the number of second voltage signals of the first level in the second voltage signal is greater than 1.

[0049] Optionally, in some embodiments, the second output terminal corresponds one-to-one to the first voltage signal; the preset voltage value is the voltage value of the fourth resistor R4; the operational amplifier P1 is used to obtain the first voltage signal corresponding to the operational amplifier P1, and when the voltage value of the first voltage signal corresponding to the operational amplifier P1 is less than the preset voltage value, output a third voltage signal of the first voltage value; when the voltage value of the first voltage signal corresponding to the operational amplifier P1 is greater than the preset voltage value, output a third voltage signal of the second voltage value; the first voltage value is less than the second voltage value; the analog-to-digital converter U1 is used to convert the third voltage signal into the second voltage signal.

[0050] Specifically, in some embodiments, the resistance value of each of the third resistors R3 is equal, and the resistance value of each of the fourth resistors R4 is equal, so that the phase loss detection standard of the first voltage signal of each phase input to the rectifier bridge 40 is the same.

[0051] In some embodiments, the first voltage value is 0 volts, and the second voltage value is a voltage value greater than 0 volts.

[0052] It should be noted that the analog-to-digital converter U1 converts the third voltage signal of the first voltage value into a second voltage signal of the first level, and the analog-to-digital converter U1 converts the third voltage signal of the second voltage value into a second voltage signal of the second level.

[0053] In an embodiment of the present application, a first voltage signal corresponding to the operational amplifier P1 is obtained through the operational amplifier P1, and when the voltage value of the first voltage signal corresponding to the operational amplifier P1 is less than a preset voltage value, a third voltage signal of the first voltage value is output, and when the voltage value of the first voltage signal corresponding to the operational amplifier P1 is greater than the preset voltage value, a third voltage signal of the second voltage value is output, wherein the first voltage value is less than the second voltage value, and then the third voltage signal is converted into a second voltage signal through the analog-to-digital converter U1, so that the judgment module 30 determines that the three-phase power supply 50 is missing a phase when the number of second voltage signals of the first level in the second voltage signal is greater than 1.

[0054] Optionally, in some embodiments, the judgment module 30 includes three judgment sub-modules 31, a first AND gate device M1 and a micro control unit U2; the judgment sub-module 31 corresponds to the second voltage signal one by one; the judgment sub-module 31 is electrically connected to the comparison module 20, and the judgment sub-module 31 is used to invert the second voltage signal corresponding to the judgment sub-module 31 to generate a fourth voltage signal, and output a fifth voltage signal according to the fourth voltage signal and the other two second voltage signals other than the second voltage signal corresponding to the judgment sub-module 31; the first AND gate device M1 is electrically connected to each of the judgment sub-modules 31 and the micro control unit U2, respectively, and the first AND gate device M1 is used to output a sixth voltage signal according to each of the fifth voltage signals; the micro control unit U2 is used to determine that the three-phase power supply 50 is missing a phase when the sixth voltage signal is at the first level; and determine that the three-phase power supply 50 is normal when the sixth voltage signal is at the second level.

[0055] It should be noted that the AND gate device outputs a high-level output signal when each input signal is at a high level; and outputs a low-level output signal when at least one input signal is at a low level.

[0056] In the embodiment of the present application, the second voltage signal corresponding to the judging submodule 31 is inverted by the judging submodule 31 to generate a fourth voltage signal, and a fifth voltage signal is output according to the fourth voltage signal and the other two second voltage signals other than the second voltage signal corresponding to the judging submodule 31, and then a sixth voltage signal is output according to each fifth voltage signal through the first AND gate device M1, and then the microcontroller unit U2 determines that the three-phase power supply 50 is phase-deficient when the sixth voltage signal is at the first level, and determines that the three-phase power supply 50 is normal when the sixth voltage signal is at the second level, thereby realizing phase-deficient detection of the three-phase power supply 50.

[0057] Optionally, in some embodiments, each of the judgment submodules 31 includes an inverter F1 and a second AND gate device M2; the comparison module 20 includes three third output terminals, and the judgment submodule 31 corresponds to the third output terminals one by one; the first AND gate device M1 includes three second input terminals, and the second AND gate device M2 corresponds to the second input terminals one by one; the second AND gate device M2 includes a third input terminal, a fourth input terminal and a fifth input terminal; in the judgment submodule 31, the input terminal of the inverter F1 is electrically connected to the third output terminal corresponding to the judgment submodule 31, and the output terminal of the inverter F1 is electrically connected to the third input terminal of the second AND gate device M2; the fourth input terminal of the second AND gate device M2 is electrically connected to a third output terminal other than the third output terminal corresponding to the judgment submodule 31, the fifth input terminal of the second AND gate device M2 is electrically connected to another third output terminal other than the third output terminal corresponding to the judgment submodule 31, and the output terminal of the second AND gate device M2 is electrically connected to the second input terminal corresponding to the second AND gate device M2.

[0058] In the embodiment of the present application, in the judgment submodule 31, the input end of the inverter F1 inverts the second voltage signal output from the third output end corresponding to the judgment submodule 31 to generate a fourth voltage signal, and then the second AND gate device M2 outputs a fifth voltage signal according to the second voltage signal output from a third output end other than the third output end corresponding to the judgment submodule 31, the second voltage signal output from another third output end other than the third output end corresponding to the judgment submodule 31, and the fourth voltage signal, and then the first AND gate device M1 outputs a sixth voltage signal according to each fifth voltage signal, so that the micro control unit U2 determines that the three-phase power supply 50 is phase-deficient when the sixth voltage signal is at the first level, and determines that the three-phase power supply 50 is normal when the sixth voltage signal is at the second level, thereby realizing phase-deficient detection of the three-phase power supply 50.

[0059] Optionally, in some embodiments, the rectifier bridge 40 includes three parallel bridge arms 41, and the bridge arms 41 correspond one-to-one to the first output terminals 501 of the phases of the three-phase power supply 50; the bridge arms 41 are electrically connected to the first output terminals 501 corresponding to the bridge arms 41; and each of the bridge arms 41 is also electrically connected to the load 60.

[0060] In the embodiment of the present application, each bridge arm 41 of the rectifier bridge 40 cooperates to realize the three-phase power supply 50 supplying power to the load 60 .

[0061] Optionally, in some embodiments, each of the bridge arms 41 includes a first diode D1 and a second diode D2; in the bridge arm 41, the positive electrode of the first diode D1 is electrically connected to the first output end 501 corresponding to the bridge arm 41; the negative electrode of the first diode D1 is electrically connected to the second end 402 of the rectifier bridge 40; the positive electrode of the second diode D2 is electrically connected to the first end 401 of the rectifier bridge 40; the negative electrode of the second diode D2 is electrically connected to the first output end 501 corresponding to the bridge arm 41; the first end 401 of the rectifier bridge 40 is electrically connected to the negative electrode of the load 60, and the second end 402 of the rectifier bridge 40 is electrically connected to the positive electrode of the load 60.

[0062] In the embodiment of the present application, the acquisition submodule 11 is connected in parallel with a branch consisting of the first diode D1 in the bridge arm 41 corresponding to the acquisition submodule 11 and the load 60, and the voltage signal of the branch consisting of the first diode D1 in the bridge arm 41 corresponding to the acquisition submodule 11 and the load 60 is obtained through the acquisition submodule 11, that is, the first voltage signal between the first output terminal 501 corresponding to the acquisition submodule 11 and the first terminal 401 of the rectifier bridge 40.

[0063] Optionally, in some embodiments, the judgment module 30 is specifically used to determine that the three-phase power supply 50 is missing a phase when the number of second voltage signals of the first level in the second voltage signal is 2 and the number of second voltage signals of the second level is 1, and to determine that the three-phase power supply 50 is missing a phase when the number of second voltage signals of the first level in the second voltage signal is 3 and the number of second voltage signals of the second level is 0.

[0064] In the embodiment of the present application, the judgment module 30 determines that the three-phase power supply 50 is phase-missing when the number of second voltage signals of the first level in the second voltage signal is 2 and the number of second voltage signals of the second level is 1, and determines that the three-phase power supply 50 is phase-missing when the number of second voltage signals of the first level in the second voltage signal is 3 and the number of second voltage signals of the second level is 0, thereby realizing phase-missing detection of the three-phase power supply 50.

[0065] Optionally, in some embodiments, the judgment module 30 is further used to determine that the three-phase power supply 50 is normal when, in the second voltage signal, the number of second voltage signals of the first level is 1 and the number of second voltage signals of the second level is 2.

[0066] In an embodiment of the present application, by judging that in the second voltage signal, the number of second voltage signals of the first level is 1 and the number of second voltage signals of the second level is 2, the three-phase power supply 50 is determined to be normal, so that the staff can know that the three-phase power supply 50 is supplying power to the load 60 normally.

[0067] Specifically, in some embodiments, the phase loss detection circuit of the three-phase power supply 50 includes an acquisition module 10, a comparison module 20 and a judgment module 30; the acquisition module 10 includes three acquisition sub-modules 11; the acquisition sub-modules 11 correspond one-to-one to the first output terminal 501 of the phase of the three-phase power supply 50; each acquisition sub-module 11 includes a first resistor R1 and a second resistor R2; the comparison module 20 includes three operational amplifiers P1, a third resistor R3, a fourth resistor R4 and an analog-to-digital converter U1; the operational amplifier P1 corresponds one-to-one to the acquisition sub-module 11; the output end of the operational amplifier P1 corresponds one-to-one to the input end of the analog-to-digital converter U1; the input end of the analog-to-digital converter U1 corresponds one-to-one to the output end of the analog-to-digital converter U1; the output end of the analog-to-digital converter U1 corresponds one-to-one to the output end of the analog-to-digital converter U1; The output terminal corresponds to the judgment submodule 31 one by one; the preset voltage value is the voltage value of the fourth resistor R4; the judgment module 30 includes three judgment submodules 31, a first AND gate device M1 and a micro control unit U2; the judgment submodule 31 corresponds to the second voltage signal one by one; each judgment submodule 31 includes an inverter F1 and a second AND gate device M2; the first AND gate device M1 includes three second input terminals, and the second AND gate device M2 corresponds to the second input terminal one by one; the second AND gate device M2 includes a third input terminal, a fourth input terminal and a fifth input terminal; the rectifier bridge 40 includes three parallel bridge arms 41, and the bridge arms 41 correspond to the first output terminals 501 of the phases of the three-phase power supply 50 one by one; each bridge arm 41 includes a first diode D1 and a second diode D2;

[0068] In the bridge arm 41 of the rectifier bridge 40, the anode of the first diode D1 is electrically connected to the first output terminal 501 corresponding to the bridge arm 41; the cathode of the first diode D1 is electrically connected to the second terminal 402 of the rectifier bridge 40; the anode of the second diode D2 is electrically connected to the first terminal 401 of the rectifier bridge 40; the cathode of the second diode D2 is electrically connected to the first output terminal 501 corresponding to the bridge arm 41; the first terminal 401 of the rectifier bridge 40 is electrically connected to the cathode of the load 60, and the second terminal 402 of the rectifier bridge 40 is electrically connected to the anode of the load 60;

[0069] In the acquisition submodule 11, the first end of the first resistor R1 is electrically connected to the first output terminal 501 corresponding to the acquisition submodule 11, and the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2 and the non-inverting input terminal of the operational amplifier P1 corresponding to the acquisition submodule 11; the second end of the second resistor R2 is electrically connected to the first end 401 of the rectifier bridge 40;

[0070] A first end of the third resistor R3 is electrically connected to an external power supply, a second end of the third resistor R3 is electrically connected to an inverting input end of each operational amplifier P1 and a first end of a fourth resistor R4 respectively; a second end of the fourth resistor R4 is grounded; an output end of the operational amplifier P1 is electrically connected to an input end of an analog-to-digital converter U1 corresponding to the operational amplifier P1;

[0071] In the judgment submodule 31, the input end of the inverter F1 is electrically connected to the output end of the analog-to-digital converter U1 corresponding to the judgment submodule 31, and the output end of the inverter F1 is electrically connected to the third input end of the second AND gate device M2; the fourth input end of the second AND gate device M2 is electrically connected to an output end of the analog-to-digital converter U1 other than the output end of the analog-to-digital converter U1 corresponding to the judgment submodule 31, the fifth input end of the second AND gate device M2 is electrically connected to another output end of the analog-to-digital converter U1 other than the output end of the analog-to-digital converter U1 corresponding to the judgment submodule 31, and the output end of the second AND gate device M2 is electrically connected to the second input end corresponding to the second AND gate device M2; the output end of the first AND gate device M1 is electrically connected to the input end of the micro control unit U2.

[0072] It should be noted that the voltage at the non-inverting input terminal of the operational amplifier P1 is the voltage of the second resistor R2 in the acquisition sub-module 11 corresponding to the operational amplifier P1, the voltage value of the non-inverting input terminal of the operational amplifier P1 is the voltage value of the first voltage signal corresponding to the operational amplifier P1, and the voltage value of the second resistor R2 is the voltage value of the first voltage signal corresponding to the operational amplifier P1; the voltage at the inverting input terminal of the operational amplifier P1 is the voltage of the fourth resistor R4, the voltage value of the inverting input terminal of the operational amplifier P1 is the preset voltage value, and the voltage value of the fourth resistor R4 is the preset voltage value.

[0073] For example, the first acquisition submodule 11 acquires a first voltage signal a1 between the first output terminal 501 corresponding to the first acquisition submodule 11 and the first terminal 401 of the rectifier bridge 40, the second acquisition submodule 11 acquires a first voltage signal a2 between the first output terminal 501 corresponding to the second acquisition submodule 11 and the first terminal 401 of the rectifier bridge 40, and the third acquisition submodule 11 acquires a first voltage signal a3 between the first output terminal 501 corresponding to the third acquisition submodule 11 and the first terminal 401 of the rectifier bridge 40;

[0074] The first operational amplifier P1 obtains the first voltage signal a1, and compares the voltage value of the first voltage signal a1 with the preset voltage value, and outputs the third voltage signal b1 corresponding to the first voltage signal a1 according to the comparison result corresponding to the first voltage signal a1; the second operational amplifier P1 obtains the first voltage signal a2, and compares the voltage value of the first voltage signal a2 with the preset voltage value, and outputs the third voltage signal b2 corresponding to the first voltage signal a2 according to the comparison result corresponding to the first voltage signal a2; the third operational amplifier P1 obtains the first voltage signal a3, and compares the voltage value of the first voltage signal a3 with the preset voltage value, and outputs the third voltage signal b3 corresponding to the first voltage signal a3 according to the comparison result corresponding to the first voltage signal a3;

[0075] The analog-to-digital converter U1 is used for converting the third voltage signal b1 into the second voltage signal c1, converting the third voltage signal b2 into the second voltage signal c2, and converting the third voltage signal b2 into the second voltage signal c2;

[0076] The first inverter F1 inverts the second voltage signal c1 to generate a fourth voltage signal d1; the second inverter F1 inverts the second voltage signal c2 to generate a fourth voltage signal d2; the third inverter F1 inverts the second voltage signal c3 to generate a fourth voltage signal d3;

[0077] The first second AND gate device M2 outputs a fifth voltage signal e1 according to the fourth voltage signal d1, the second voltage signal c2 and the second voltage signal c3; the second second AND gate device M2 outputs a fifth voltage signal e2 according to the fourth voltage signal d2, the second voltage signal c1 and the second voltage signal c3; the third second AND gate device M2 outputs a fifth voltage signal e3 according to the fourth voltage signal d3, the second voltage signal c2 and the second voltage signal c1;

[0078] The first AND gate device M1 outputs a sixth voltage signal according to the fifth voltage signal e1, the fifth voltage signal e2 and the fifth voltage signal e3;

[0079] The micro control unit U2 determines that the three-phase power supply 50 is missing a phase when the sixth voltage signal is at the first level; and determines that the three-phase power supply 50 is normal when the sixth voltage signal is at the second level.

[0080] Reference Figure 3, when the three-phase power supply 50 is normal, the voltage curve of the first voltage signal a1 obtained by the first operational amplifier P1 is a curve L1 in a coordinate system with the vertical axis being the voltage value U and the horizontal axis being the time t. The period from time t1 to time t4 is a cycle of the curve L1. In the time period from time ta to time tb, the voltage value of the first voltage signal a1 is greater than the voltage value Ut of the inverting input terminal of the operational amplifier P1. The voltage curve of the first voltage signal a2 obtained by the second operational amplifier P1 is a curve L2 in a coordinate system with the vertical axis being the voltage U and the horizontal axis being the time t. t The period from t2 to t5 is one cycle of the curve L2. In the time period from tc to td, the voltage value of the first voltage signal a2 is greater than the voltage value Ut of the inverting input terminal of the operational amplifier P1. The voltage curve of the first voltage signal a3 obtained by the third operational amplifier P1 is the curve L3 in the coordinate system with the vertical axis being the voltage U and the horizontal axis being the time t. The period from t3 to t6 is one cycle of the curve L1. In the time period from te to tf, the voltage value of the first voltage signal a3 is greater than the voltage value Ut of the inverting input terminal of the operational amplifier P1.

[0081] The phase difference between the first voltage signal a1 and the first voltage signal a2 is 120 degrees, the phase difference between the first voltage signal a2 and the first voltage signal a3 is 120 degrees, and the phase difference between the first voltage signal a3 and the first voltage signal a1 is 120 degrees.

[0082] Reference Figure 4 (a), the voltage curve of the second voltage signal c1 is a curve L4 in a coordinate system where the vertical axis is the voltage value U and the horizontal axis is the time t; refer to Figure 4 (b), the voltage curve of the second voltage signal c2 is a curve L5 in a coordinate system where the vertical axis is the voltage value U and the horizontal axis is the time t; refer to Figure 4 (c) The voltage curve of the second voltage signal c3 is a curve L6 in a coordinate system in which the vertical axis is the voltage value U and the horizontal axis is the time t.

[0083] Reference Figure 5, in the case of a phase failure or interruption corresponding to the first voltage signal a3 of the three-phase power supply 50, the voltage curve of the first voltage signal a1 obtained by the first operational amplifier P1 is a curve L7 in a coordinate system with the vertical axis being the voltage value U and the horizontal axis being the time t. In the time period from tg to th, the voltage value of the first voltage signal a1 is greater than the voltage value Ut of the inverting input terminal of the operational amplifier P1; the voltage curve of the first voltage signal a2 obtained by the second operational amplifier P1 is a curve L8 in a coordinate system with the vertical axis being the voltage U and the horizontal axis being the time t. In the time period from ti to tj, the voltage value of the first voltage signal a2 is greater than the voltage value Ut of the inverting input terminal of the operational amplifier P1; the voltage curve of the first voltage signal a3 obtained by the second operational amplifier P1 is a curve L9 in a coordinate system with the vertical axis being the voltage U and the horizontal axis being the time t. The curve L9 coincides with the horizontal axis. The voltage value of the first voltage signal a3 obtained by the third operational amplifier P1 is 0 volt;

[0084] Wherein, the phase difference between the first voltage signal a1 and the first voltage signal a2 is 180 degrees;

[0085] Reference Figure 6 (a), the voltage curve of the second voltage signal c1 is a curve L10 in a coordinate system where the vertical axis is the voltage value U and the horizontal axis is the time t; Figure 6 (b), the voltage curve of the second voltage signal c2 is a curve L11 in a coordinate system where the vertical axis is the voltage value U and the horizontal axis is the time t; refer to Figure 6 (c) The voltage curve of the second voltage signal c3 is a curve L12 in a coordinate system in which the vertical axis is the voltage value U and the horizontal axis is the time t. The curve L12 coincides with the horizontal axis, and the second voltage signal c3 is at a low level.

[0086] Reference Figure 7 In the case of a multi-phase fault or interrupted phase loss of the three-phase power supply 50, the voltage curve of the first voltage signal a1 obtained by the first operational amplifier P1 is a curve L13 in a coordinate system with the vertical axis being the voltage value U and the horizontal axis being the time t. The curve L13 coincides with the horizontal axis, and the voltage value of the first voltage signal a1 obtained by the first operational amplifier P1 is 0 volt; the voltage curve of the first voltage signal a2 obtained by the second operational amplifier P1 is a curve L14 in a coordinate system with the vertical axis being the voltage U and the horizontal axis being the time t. The curve L14 coincides with the horizontal axis, and the voltage value of the first voltage signal a2 obtained by the second operational amplifier P1 is 0 volt t; the voltage curve of the first voltage signal a3 obtained by the second operational amplifier P1 is a curve L15 in a coordinate system with the vertical axis being the voltage U and the horizontal axis being the time t. The curve L15 coincides with the horizontal axis, and the voltage value of the first voltage signal a3 obtained by the third operational amplifier P1 is 0 volt.

[0087] In some embodiments, the truth table of the level X1 of the second voltage signal c1, the level X2 of the second voltage signal c2, the level X3 of the second voltage signal c3, and the level Q of the sixth voltage signal is as follows (Table 1):

[0088] X1 1 1 0 1 0 0 0 X2 1 0 1 0 1 0 0 X3 0 1 1 0 0 1 0 Q 1 1 1 0 0 0 0

[0089] Table 1

[0090] Specifically, the logical relationship between the level X1 of the second voltage signal c1, the level X2 of the second voltage signal c2, the level X3 of the second voltage signal c3 and the level Q of the sixth voltage signal is as follows:

[0091]

[0092] For example, the level X1 of the second voltage signal c1 is binary 1, the level X2 of the second voltage signal c2 is binary 1, and the level X3 of the second voltage signal c3 is binary 0, then is binary 0, is binary 0, is binary 1, and is binary 1, is binary 0, is binary 0, so the level Q of the sixth voltage signal is binary 1.

[0093] Optionally, refer to Figure 8In some embodiments, the three-phase power supply 50 phase loss detection process includes: Y1, start; Y2, collect the first voltage signal of each phase input rectifier bridge 40 of the three-phase power supply 50 through the acquisition module 10; Y3, compare the voltage value of each first voltage signal with the preset voltage value through the comparison module 20, and output the second voltage signal corresponding to the first voltage signal, that is, compare the voltage value of each first voltage signal with the preset voltage value through the comparison module 20, and output the second voltage signal corresponding to the first voltage signal according to the comparison result corresponding to the first voltage signal; Y4, output the fifth voltage signal according to the second voltage signal through the judgment submodule 31, and output the sixth voltage signal according to each fifth voltage signal through the first AND gate device M1, that is, output the sixth voltage signal according to the fifth voltage signal through the judgment submodule 31 inverts the second voltage signal corresponding to the judgment submodule 31 to generate a fourth voltage signal, and outputs a fifth voltage signal according to the fourth voltage signal and the other two second voltage signals other than the second voltage signal corresponding to the judgment submodule 31, and outputs a sixth voltage signal according to each fifth voltage signal through the first AND gate device M1; Y5, determines whether the sixth voltage signal is 1, that is, determines whether the sixth voltage signal is 1 through the micro control unit U2; Y6, the three-phase power supply 50 is normal, that is, the micro control unit U2 determines that the three-phase power supply 50 is normal when the sixth voltage signal is at the second level; Y7, the three-phase power supply 50 is out of phase, that is, the micro control unit U2 determines that the three-phase power supply 50 is out of phase when the sixth voltage signal is at the first level; Y8, end.

[0094] An embodiment of the present application also provides an electrical device, including the three-phase power supply phase loss detection circuit as described above.

[0095] The specific implementation process of the three-phase power supply phase loss detection circuit in the electrical equipment is similar to the specific implementation process of the three-phase power supply phase loss detection circuit mentioned above, and will not be repeated here.

[0096] It should be noted that the electrical equipment is equipment powered by a three-phase power supply, for example, the electrical equipment may be a motor, a compressor, etc.

[0097] The embodiment of the present application uses a voltage detection method to avoid interference with the three-phase power supply 50; converts an analog signal into a digital signal, and outputs the output result of the digital signal through a logical operation, so as to determine whether there is a phase loss fault based on the output result; the embodiment of the present application provides an independent three-phase power supply 50 phase loss detection circuit, which can be directly connected to the rectifier bridge 40 for voltage sampling, and can output a phase loss fault code when the three-phase power supply 50 is phase lost.

[0098] To sum up, in the embodiment of the present application, the first voltage signal of each phase of the three-phase power supply 50 input to the rectifier bridge 40 is collected by the acquisition module 10, and then the voltage value of each first voltage signal is compared with the preset voltage value by the comparison module 20, and according to the comparison result corresponding to the first voltage signal, the second voltage signal corresponding to the first voltage signal is output, wherein, when the voltage value is less than the preset voltage value, the second voltage signal is a first level, and then, when the number of second voltage signals of the first level in the second voltage signal is greater than 1, the judgment module 30 determines that the three-phase power supply 50 is phase-deficient, so as to realize the phase-deficient detection of the three-phase power supply 50, and no manual detection is required, thereby improving work efficiency.

[0099] Fig. 9 A three-phase power supply phase loss detection method provided in an embodiment of the present application is as follows: Fig. 9 As shown, the method may include:

[0100] Step 101: Collect a first voltage signal of each phase of a three-phase power supply input to a rectifier bridge.

[0101] Wherein, the three-phase power supply is electrically connected to the rectifier bridge.

[0102] The implementation method of this step is similar to the above implementation process and will not be repeated here.

[0103] Step 102: Compare the voltage value of each of the first voltage signals with a preset voltage value, and generate a second voltage signal corresponding to the first voltage signal according to the comparison result corresponding to the first voltage signal.

[0104] When the voltage value is less than the preset voltage value, the second voltage signal is at a first level; when the voltage value is greater than the preset voltage value, the second voltage signal is at a second level; the first level is opposite to the second level.

[0105] The implementation method of this step is similar to the above implementation process and will not be repeated here.

[0106] Step 103: When the number of the second voltage signals of the first level in the second voltage signals is greater than one, determine that the three-phase power supply is missing a phase.

[0107] The implementation method of this step is similar to the above implementation process and will not be repeated here.

[0108] In an embodiment of the present application, by collecting the first voltage signal of each phase of the three-phase power supply input rectifier bridge, and then comparing the voltage value of each first voltage signal with the preset voltage value, and generating a second voltage signal corresponding to the first voltage signal according to the comparison result corresponding to the first voltage signal, and then determining that the three-phase power supply is phase-lost when the number of second voltage signals of the first level in the second voltage signal is greater than 1, so as to realize the phase-lost detection of the three-phase power supply without manual detection, thereby improving work efficiency.

[0109] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0110] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A three-phase power supply phase loss detection circuit, characterized in that: include: Acquisition module, comparison module and judgment module; The acquisition module is used to be electrically connected to the three-phase power supply and the rectifier bridge respectively, and to acquire the first voltage signal of each phase of the three-phase power supply input to the rectifier bridge; the rectifier bridge is electrically connected to the three-phase power supply; The comparison module is electrically connected to the acquisition module and the judgment module respectively, and is used to compare the voltage value of each of the first voltage signals with a preset voltage value respectively, and output a second voltage signal corresponding to the first voltage signal according to the comparison result corresponding to the first voltage signal; When the voltage value is less than the preset voltage value, the second voltage signal is at a first level; When the voltage value is greater than the preset voltage value, the second voltage signal is at a second level; the first level is opposite to the second level; The judgment module is used to determine that the three-phase power supply is missing a phase when the number of the second voltage signals of the first level in the second voltage signals is greater than one.

2. The three-phase power supply phase loss detection circuit according to claim 1, characterized in that: The acquisition module includes three acquisition submodules; the acquisition submodules correspond one-to-one to the first output terminals of the phases of the three-phase power supply; The acquisition submodule is electrically connected to the first output terminal corresponding to the acquisition submodule and the first terminal of the rectifier bridge respectively, and the acquisition submodule is used to acquire a first voltage signal between the first output terminal corresponding to the acquisition submodule and the first terminal of the rectifier bridge; Among them, the first end of the rectifier bridge is electrically connected to the negative pole of the load, and the second end of the rectifier bridge is electrically connected to the positive pole of the load; the rectifier bridge also includes three first input ends, and the first input ends correspond to the first output ends one by one; the first input ends are electrically connected to the first output ends corresponding to the first input ends.

3. The three-phase power supply phase loss detection circuit according to claim 2, characterized in that: The acquisition submodule includes a first resistor and a second resistor; In the acquisition submodule, the first end of the first resistor is electrically connected to the first output end corresponding to the acquisition submodule, and the second end of the first resistor is electrically connected to the first end of the second resistor; The second end of the second resistor is electrically connected to the first end of the rectifier bridge.

4. The three-phase power supply phase loss detection circuit according to claim 1, characterized in that: The comparison module includes three operational amplifiers, a third resistor, a fourth resistor and an analog-to-digital converter; the acquisition module includes three second output terminals, and the operational amplifiers correspond to the second output terminals one by one; the output terminals of the operational amplifiers correspond to the input terminals of the analog-to-digital converter one by one; the input terminals of the analog-to-digital converter correspond to the output terminals of the analog-to-digital converter one by one; the output terminals of the analog-to-digital converter correspond to the input terminals of the judgment module one by one; The first end of the third resistor is used to be electrically connected to an external power supply, and the second end of the third resistor is electrically connected to the inverting input end of each operational amplifier and the first end of the fourth resistor respectively; The second end of the fourth resistor is grounded; The in-phase input terminal of the operational amplifier is electrically connected to the second output terminal corresponding to the operational amplifier, and the output terminal of the operational amplifier is electrically connected to the input terminal of the analog-to-digital converter corresponding to the operational amplifier; The output end of the analog-to-digital converter is electrically connected to the input end of the judgment module corresponding to the analog-to-digital converter.

5. The three-phase power supply phase loss detection circuit according to claim 4, characterized in that: The second output terminal corresponds to the first voltage signal one by one; the preset voltage value is the voltage value of the fourth resistor; The operational amplifier is used to obtain a first voltage signal corresponding to the operational amplifier, and output a third voltage signal of the first voltage value when the voltage value of the first voltage signal corresponding to the operational amplifier is less than the preset voltage value; and output a third voltage signal of the second voltage value when the voltage value of the first voltage signal corresponding to the operational amplifier is greater than the preset voltage value; the first voltage value is less than the second voltage value; The analog-to-digital converter is used to convert the third voltage signal into the second voltage signal.

6. The three-phase power supply phase loss detection circuit according to claim 1, characterized in that: The judgment module includes three judgment submodules, a first AND gate device and a microcontroller unit; the judgment submodules correspond to the second voltage signal one by one; The judging submodule is electrically connected to the comparing module, and the judging submodule is used to invert the second voltage signal corresponding to the judging submodule to generate a fourth voltage signal, and output a fifth voltage signal according to the fourth voltage signal and two other second voltage signals other than the second voltage signal corresponding to the judging submodule; The first AND gate device is electrically connected to each of the judgment submodules and the micro control unit respectively, and the first AND gate device is used to output a sixth voltage signal according to each of the fifth voltage signals; The micro control unit is used to determine that the three-phase power supply is missing a phase when the sixth voltage signal is at a first level; and to determine that the three-phase power supply is normal when the sixth voltage signal is at a second level.

7. The three-phase power supply phase loss detection circuit according to claim 6, characterized in that: Each of the judgment submodules includes an inverter and a second AND gate device; the comparison module includes three third output terminals, and the judgment submodule corresponds to the third output terminals one by one; the first AND gate device includes three second input terminals, and the second AND gate device corresponds to the second input terminal one by one; the second AND gate device includes a third input terminal, a fourth input terminal and a fifth input terminal; In the judgment submodule, the input end of the inverter is electrically connected to the third output end corresponding to the judgment submodule, and the output end of the inverter is electrically connected to the third input end of the second AND gate device; the fourth input end of the second AND gate device is electrically connected to a third output end other than the third output end corresponding to the judgment submodule, the fifth input end of the second AND gate device is electrically connected to another third output end other than the third output end corresponding to the judgment submodule, and the output end of the second AND gate device is electrically connected to the second input end corresponding to the second AND gate device.

8. The three-phase power supply phase loss detection circuit according to claim 1, characterized in that: The rectifier bridge comprises three bridge arms connected in parallel, and the bridge arms correspond one by one to the first output ends of the phases of the three-phase power supply; The bridge arm is electrically connected to the first output end corresponding to the bridge arm; Each of the bridge arms is also electrically connected to a load.

9. The three-phase power supply phase loss detection circuit according to claim 8, characterized in that: Each of the bridge arms comprises a first diode and a second diode; In the bridge arm, the anode of the first diode is electrically connected to the first output end corresponding to the bridge arm; the cathode of the first diode is electrically connected to the second end of the rectifier bridge; the anode of the second diode is electrically connected to the first end of the rectifier bridge; the cathode of the second diode is electrically connected to the first output end corresponding to the bridge arm; The first end of the rectifier bridge is electrically connected to the negative electrode of the load, and the second end of the rectifier bridge is electrically connected to the positive electrode of the load.

10. The three-phase power supply phase loss detection circuit according to claim 1, characterized in that: The judgment module is specifically used to determine that the three-phase power supply is missing a phase when the number of second voltage signals at the first level in the second voltage signal is 2 and the number of second voltage signals at the second level is 1, and to determine that the three-phase power supply is missing a phase when the number of second voltage signals at the first level in the second voltage signal is 3 and the number of second voltage signals at the second level is 0.

11. The three-phase power supply phase loss detection circuit according to claim 1, characterized in that: The judgment module is further configured to determine that the three-phase power supply is normal when, in the second voltage signal, the number of the second voltage signal at the first level is 1 and the number of the second voltage signal at the second level is 2.

12. An electrical device, characterized in that: The invention comprises a three-phase power supply phase loss detection circuit as claimed in any one of claims 1 to 11.

13. A three-phase power supply phase loss detection method, characterized in that: The method comprises: Collecting a first voltage signal of each phase of a three-phase power supply input to a rectifier bridge; the three-phase power supply is electrically connected to the rectifier bridge; Comparing the voltage value of each of the first voltage signals with a preset voltage value respectively, and generating a second voltage signal corresponding to the first voltage signal according to the comparison result corresponding to the first voltage signal; when the voltage value is less than the preset voltage value, the second voltage signal is at a first level; When the voltage value is greater than the preset voltage value, the second voltage signal is at a second level; The first level is opposite to the second level; When the number of the second voltage signals of the first level in the second voltage signals is greater than one, it is determined that the three-phase power supply is phase-lost.

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