A power supply detection circuit and method compatible with three-phase three-wire and three-phase four-wire

Abstract

The invention belongs to the field of electric energy meters, and discloses a power supply detection circuit and method compatible with three-phase three-wire and three-phase four-wire, comprising a pluggable first connector or a pluggable second connector; the first connector is connected to the three-phase voltage in a three-phase three-wire manner; the second connector is connected to the three-phase voltage in a three-phase four-wire manner; the invention also comprises a metering circuit, a trigger circuit, a control circuit and a display component; the metering circuit detects the line voltage of the three-phase voltage to generate a detection voltage; the trigger circuit generates a trigger signal; the control circuit generates a display signal according to the detection voltage and the trigger signal; the display signal carries confirmation information or alarm information; the display component displays according to the display signal; since the user can timely understand whether the current connection mode of the three-phase voltage of the electric energy meter meets the user's needs, misoperation is prevented, and the safety of the power supply detection circuit compatible with three-phase three-wire and three-phase four-wire is improved.

Description

Technical Field

[0001] The invention belongs to the field of electric energy meters, and in particular relates to a power supply detection circuit and method compatible with three-phase three-wire and three-phase four-wire. Background Art

[0002] The traditional three-phase three-wire and three-phase four-wire adaptive intelligent energy meter includes a three-phase metering analog sampling circuit connected to a three-phase power load, the output end of the three-phase metering analog sampling circuit is connected to a three-phase energy meter CPU and a three-phase energy metering chip, the output end of the three-phase energy meter CPU is connected to an energy metering conversion circuit, and the output end of the energy metering conversion circuit is connected to a three-phase metering analog sampling circuit; the three-phase energy meter CPU and the three-phase energy metering chip communicate bidirectionally. Through the intelligent control of the single-chip microcomputer, the three-phase star connection or three-phase triangle connection method of the adaptive power supply output of the three-phase electronic energy meter is realized, so that it can be compatible with different load occasions in the existing three-phase circuit; however, it cannot determine whether the current three-phase voltage connection method (three-phase star connection or three-phase triangle connection method) of the energy meter meets the user's needs, which is easy to cause misoperation.

[0003] Therefore, the traditional power supply detection circuit compatible with three-phase three-wire and three-phase four-wire has the defect of being unable to determine whether the current three-phase voltage connection method (three-phase star connection or three-phase triangle connection method) of the electric energy meter meets user requirements, which can easily lead to misoperation. Summary of the invention

[0004] The present invention provides a power supply detection circuit and method compatible with three-phase three-wire and three-phase four-wire, aiming to solve the problem that the traditional power supply detection circuit compatible with three-phase three-wire and three-phase four-wire cannot judge whether the current connection mode of the three-phase voltage of the electric energy meter (three-phase star connection or three-phase triangle connection method) meets the user's needs, thus easily leading to misoperation.

[0005] The present invention provides a power supply detection circuit compatible with three-phase three-wire and three-phase four-wire, wherein the power supply detection circuit compatible with three-phase three-wire and three-phase four-wire includes a pluggable first connector or a pluggable second connector;

[0006] The first connector is used to connect a three-phase voltage in a three-phase three-wire manner;

[0007] The second connector is used to connect the three-phase voltage in a three-phase four-wire manner;

[0008] The power supply detection circuit compatible with three-phase three-wire and three-phase four-wire also includes:

[0009] A metering circuit connected to the first connector or the second connector and configured to detect the line voltage of the three-phase voltage to generate a detection voltage;

[0010] a trigger circuit for generating a trigger signal;

[0011] A control circuit connected to the metering circuit and the trigger circuit, and used to generate a display signal according to the detection voltage and the trigger signal; the display signal carries confirmation information or alarm information;

[0012] A display component connected to the control circuit and used for displaying according to the display signal.

[0013] The present invention also provides an electric energy meter including the power supply detection circuit compatible with three-phase three-wire and three-phase four-wire as described above.

[0014] The present invention also provides a power supply detection method compatible with three-phase three-wire and three-phase four-wire, the power supply detection method compatible with three-phase three-wire and three-phase four-wire comprising:

[0015] Using a pluggable first connector to connect a three-phase voltage in a three-phase three-wire manner, or using a pluggable second connector to connect the three-phase voltage in a three-phase four-wire manner;

[0016] detecting a line voltage of the three-phase voltage to generate a detection voltage;

[0017] generating a trigger signal;

[0018] Generate a display signal according to the detection voltage and the trigger signal; the display signal carries confirmation information or alarm information;

[0019] Display is performed according to the display signal.

[0020] In the embodiment of the present invention, since the control circuit generates a display signal according to the detection voltage and the trigger signal, the user can timely understand whether the current connection method of the three-phase voltage of the electric energy meter (three-phase star connection or three-phase triangle connection) meets the user's needs, thereby preventing misoperation and improving the safety of the power supply detection circuit compatible with three-phase three-wire and three-phase four-wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical invention in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A module structure diagram of a power supply detection circuit compatible with three-phase three-wire and three-phase four-wire provided in an embodiment of the present invention;

[0023] Figure 2 Another module structure diagram of a power supply detection circuit compatible with three-phase three-wire and three-phase four-wire provided in an embodiment of the present invention;

[0024] Figure 3 An exemplary circuit diagram of an AC-DC conversion circuit of a power supply detection circuit compatible with three-phase three-wire and three-phase four-wire provided in an embodiment of the present invention;

[0025] Figure 4 An exemplary circuit diagram of a first connector and a second connector of a power supply detection circuit compatible with three-phase three-wire and three-phase four-wire provided in an embodiment of the present invention;

[0026] Figure 5 An example circuit diagram of a power detection circuit key assembly compatible with three-phase three-wire and three-phase four-wire provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] Figure 1 The module structure of the power supply detection circuit compatible with three-phase three-wire and three-phase four-wire provided by the embodiment of the present invention is shown. For the convenience of description, only the part related to the embodiment of the present invention is shown, which is described in detail as follows:

[0029] The above-mentioned power supply detection circuit compatible with three-phase three-wire and three-phase four-wire includes a pluggable first connector 011 or a pluggable second connector 012. The first connector 011 is used to connect three-phase voltage in a three-phase three-wire mode; the second connector 012 is used to connect three-phase voltage in a three-phase four-wire mode.

[0030] The power supply detection circuit compatible with three-phase three-wire and three-phase four-wire also includes a metering circuit 02 , a trigger circuit 03 , a control circuit 04 and a display component 05 .

[0031] The metering circuit 02 is connected to the first connector 011 or the second connector 012, and is used to detect the line voltage of the three-phase voltage to generate a detection voltage; the trigger circuit 03 is used to generate a trigger signal; the control circuit 04 is connected to the metering circuit 02 and the trigger circuit 03, and is used to generate a display signal according to the detection voltage and the trigger signal; the display signal carries confirmation information or alarm information; the display component 05 is connected to the control circuit 04, and is used to display according to the display signal.

[0032] There are two situations for trigger signals.

[0033] In the first case, the trigger signal is a wired communication signal, and the trigger circuit 03 is a wireless communication circuit; the wireless communication circuit is used to generate a wired communication signal based on the wireless communication signal received from the wireless link; the control circuit 04 is specifically used to generate a display signal based on the detection voltage and the wired communication signal.

[0034] By generating a wired communication signal according to the wireless communication signal received from the wireless link through the wireless communication circuit, the working mode of the power supply detection circuit compatible with three-phase three-wire and three-phase four-wire is remotely switched, which facilitates remote operation by users.

[0035] In the second case, the trigger signal is a key signal, and the trigger circuit 03 is a key component; the key component is used to generate a key signal according to user input; and the control circuit 04 is specifically used to generate a display signal according to the detection voltage and the key signal.

[0036] By generating key signals according to user input through the key component, local switching of the working mode of the power supply detection circuit compatible with three-phase three-wire and three-phase four-wire is realized, which facilitates on-site installation and maintenance.

[0037] The user can know whether the connection method of the three-phase voltage (three-phase star connection or three-phase triangle connection) meets the user's needs based on the display of the display component, and decide whether to replace the connector based on the display result.

[0038] like Figure 2 As shown, the power supply detection circuit compatible with three-phase three-wire and three-phase four-wire also includes an AC-DC conversion circuit 06.

[0039] The AC / DC conversion circuit 06 is connected to the first connector 011 or the second connector 012 and is used to generate direct current according to the three-phase voltage.

[0040] Figure 3 The example circuit structure of the AC-DC conversion circuit 06 of the power supply detection circuit compatible with three-phase three-wire and three-phase four-wire provided in the embodiment of the present invention is shown. For the convenience of explanation, only the part related to the embodiment of the present invention is shown, which is described in detail as follows:

[0041] The AC-DC conversion circuit 06 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a first varistor RV1, a second varistor RV2, a third varistor RV3, a fourth varistor RV4, a first resistor R1, a second resistor R2 and a third resistor R3;

[0042] The first end of the first varistor RV1 and the first end of the first resistor R1 together constitute the A-phase voltage input end of the AC-DC conversion circuit 06, the first end of the second resistor R2 is the B-phase voltage input end of the AC-DC conversion circuit 06, the second end of the first varistor RV1 and the first end of the third resistor R3 together constitute the C-phase voltage input end of the AC-DC conversion circuit 06, the second end of the first resistor R1 is connected to the first end of the second varistor RV2, the first end of the fourth varistor RV4, the anode of the first diode D1 and the cathode of the second diode D2, the second end of the second resistor R2 is connected to the second end of the second varistor RV2, the first end of the third varistor R3 The first end of the varistor RV3, the anode of the third diode D3 and the cathode of the fourth diode D4 are connected, the second end of the third resistor R3 is connected to the second end of the third varistor RV3, the second end of the fourth varistor RV4, the anode of the fifth diode D5 and the cathode of the sixth diode D6, the cathode of the first diode D1, the cathode of the third diode D3 and the cathode of the fifth diode D5 together constitute the first DC output end of the AC-DC conversion circuit 06, the anode of the second diode D2, the anode of the fourth diode D4 and the cathode of the sixth diode D6 together constitute the second DC output end of the AC-DC conversion circuit 06.

[0043] like Figure 3 The AC-DC conversion circuit 06 shown can output stable DC power in both three-phase three-wire mode and three-phase four-wire mode, thereby improving the reliability of the power supply detection circuit compatible with three-phase three-wire and three-phase four-wire.

[0044] Figure 4 An exemplary circuit structure of a first connector 011 and a second connector 012 of a power supply detection circuit compatible with three-phase three-wire and three-phase four-wire provided in an embodiment of the present invention is shown. For ease of description, only the part related to the embodiment of the present invention is shown, which is described in detail as follows:

[0045] The first end of the first connector 011 is connected to the A phase voltage of the three-phase voltage, the second end of the first connector 011 is connected to the B phase voltage of the three-phase voltage, the third end of the first connector 011 is connected to the C phase voltage of the three-phase voltage, and the fourth end of the first connector 011 is connected to the power ground.

[0046] The first end of the second connector 012 is connected to the A phase voltage of the three-phase voltage, the second end of the second connector 012 is connected to the fourth end of the second connector 012, the B phase voltage of the three-phase voltage and the power ground, and the third end of the second connector 012 is connected to the C phase voltage of the three-phase voltage.

[0047] Figure 5An example circuit structure of a power detection circuit key assembly compatible with three-phase three-wire and three-phase four-wire provided by an embodiment of the present invention is shown. For ease of description, only the part related to the embodiment of the present invention is shown, which is described in detail as follows:

[0048] The button assembly includes a button K1, a first capacitor C1, a fourth resistor R4 and a fifth resistor R5;

[0049] The static contact of the key K1 is connected to the first end of the fourth resistor R4, the first end of the first capacitor C1 and the first end of the fifth resistor R5. The second end of the fourth resistor R4 is the key signal output end. The normally closed contact of the key K1 is connected to the first power supply VAA. The normally open contact of the key K1, the second end of the first capacitor C1 and the second end of the fifth resistor R5 are connected to the power ground.

[0050] The following is a combination of working principles Figures 4 to 5 As shown for further explanation:

[0051] The metering circuit 02 is connected to the first connector 011 or the second connector 012 , and detects the line voltages of the three-phase voltage to generate a detection voltage.

[0052] The wireless communication module generates a wired communication signal according to the wireless communication signal received from the wireless link, wherein the wired communication signal carries mode information; the control circuit 04 configures parameters according to the mode information, wherein the parameters include the line voltage rating of the three-phase voltage; the control circuit 04 determines whether the line voltage matches the line voltage rating, and when the control circuit 04 determines that the line voltage matches the line voltage rating, it generates confirmation information and generates a display signal carrying the confirmation information; when the control circuit 04 determines that the line voltage does not match the line voltage rating, it generates alarm information and generates a display signal carrying the alarm information. The display component 05 displays according to the display signal.

[0053] It should be noted that when the mode information is three-phase three-wire, the line voltage rating of the three-phase voltage is equal to the phase voltage of the three-phase voltage. When the mode information is three-phase four-wire, the line voltage rating of the three-phase voltage is equal to the phase voltage of the three-phase voltage. times.

[0054] When the static contact of the key K1 is connected to the normally closed contact of the key K1, the second end of the fourth resistor R4 outputs a high-level key signal; when the static contact of the key K1 is connected to the normally open contact of the key K1, the second end of the fourth resistor R4 outputs a low-level key signal. The control circuit 04 configures parameters according to the jump of the key signal, wherein the parameters include the line voltage rating of the three-phase voltage; the control circuit 04 determines whether the line voltage of the three-phase voltage matches the line voltage rating of the three-phase voltage, and when the control circuit 04 determines that the line voltage of the three-phase voltage matches the line voltage rating of the three-phase voltage, it generates confirmation information and generates a display signal carrying the confirmation information; when the control circuit 04 determines that the line voltage of the three-phase voltage does not match the line voltage rating of the three-phase voltage, it generates alarm information and generates a display signal carrying the alarm information. The display component 05 displays according to the display signal.

[0055] In a specific implementation, the button can realize the rotation switching of modes. For example, after the button is pressed, the button signal jumps from high level to low level, and the metering module switches from three-phase four mode to three-phase three mode according to the jump of the falling edge of the button signal. At this time, the line voltage rating of the three-phase voltage can be equal to the phase voltage of the three-phase voltage. Release the button, and the button signal jumps from low level to high level. After the button is pressed again, the button signal jumps from high level to low level, and the metering module switches from three-phase three mode to three-phase four mode according to the jump of the falling edge of the button signal. At this time, the line voltage rating of the three-phase voltage can be equal to the phase voltage of the three-phase voltage. times.

[0056] An embodiment of the present invention further provides an electric energy meter, which includes the power supply detection circuit compatible with three-phase three-wire and three-phase four-wire as described above.

[0057] The present invention also provides a power supply detection method compatible with three-phase three-wire and three-phase four-wire. The power supply detection method compatible with three-phase three-wire and three-phase four-wire includes steps 701 to 75.

[0058] In step 701, a three-phase voltage is connected in a three-phase three-wire manner using a pluggable first connector, or the three-phase voltage is connected in a three-phase four-wire manner using a pluggable second connector.

[0059] In step 702, the line voltages of the three-phase voltages are detected to generate detection voltages.

[0060] In step 703, a trigger signal is generated.

[0061] There are two situations where the trigger signal can be used.

[0062] In the first case, the trigger signal is a wired communication signal, and step 703 may specifically include: generating the wired communication signal from a wireless communication signal received from a wireless link.

[0063] In the second case, the trigger signal is a key signal, and step 703 specifically includes: generating a key signal according to user input.

[0064] In step 704, a display signal is generated according to the detection voltage and the trigger signal; the display signal carries confirmation information or alarm information.

[0065] Step 704 may have two situations:

[0066] In the first case, step 704 may specifically include: generating the display signal according to the detection voltage and the wired communication signal, configuring parameters according to the wired communication signal, and generating the display signal according to the parameters and the detection voltage.

[0067] The wired communication signal carries mode information, configures parameters corresponding to the mode information (line voltage ratings of three-phase voltages), and generates a display signal according to the parameters and the detection voltage. The mode information may be three-phase three-wire or three-phase four-wire.

[0068] In the second case, step 704 may specifically include: generating the display signal according to the detection voltage and the key signal, configuring parameters according to the transition of the key signal, and generating the display signal according to the parameters and the detection voltage.

[0069] In a specific implementation, the button can realize the rotation switching of modes. For example, after the button is pressed, the button signal jumps from high level to low level, and the metering module switches from three-phase four mode to three-phase three mode according to the jump of the falling edge of the button signal. At this time, the line voltage rating of the three-phase voltage can be equal to the phase voltage of the three-phase voltage. Release the button, and the button signal jumps from low level to high level. After the button is pressed again, the button signal jumps from high level to low level, and the metering module switches from three-phase three mode to three-phase four mode according to the jump of the falling edge of the button signal. At this time, the line voltage rating of the three-phase voltage can be equal to the phase voltage of the three-phase voltage. times.

[0070] In step 705, display is performed according to the display signal.

[0071] The user can know whether the connection method of the three-phase voltage (three-phase star connection or three-phase triangle connection) meets the user's needs based on the display of the display component, and decide whether to replace the connector based on the display result.

[0072] In a specific implementation, step 705 may be followed by step 706 and step 707 .

[0073] In step 706, the control circuit generates a control signal according to the trigger signal.

[0074] In step 707, the metering circuit switches the metering mode according to the control signal.

[0075] The metering circuit has different configuration requirements in the three-phase three-wire and three-phase four-wire modes. After the control module successfully identifies the mode according to the trigger signal, the software calls the corresponding configuration function, writes the corresponding registers of the metering chip in the metering circuit and resets the metering chip, so that the configured electric energy meter can measure according to the set metering mode.

[0076] The embodiment of the present invention includes a pluggable first connector or a pluggable second connector; the first connector is connected to the three-phase voltage in a three-phase three-wire manner; the second connector is connected to the three-phase voltage in a three-phase four-wire manner; the embodiment of the present invention also includes a metering circuit, a trigger circuit, a control circuit and a display component; the metering circuit detects the line voltage of the three-phase voltage to generate a detection voltage; the trigger circuit generates a trigger signal; the control circuit generates a display signal according to the detection voltage and the trigger signal; the display signal carries confirmation information or alarm information; the display component displays according to the display signal; because the control circuit generates the display signal according to the detection voltage and the trigger signal, the user can timely understand whether the current connection method of the three-phase voltage of the electric energy meter (three-phase star connection or three-phase triangle connection method) meets the user's needs, prevent misoperation, and improve the safety of the power supply detection circuit compatible with three-phase three-wire and three-phase four-wire.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power supply detection circuit compatible with three-phase three-wire and three-phase four-wire, characterized in that: The power supply detection circuit compatible with three-phase three-wire and three-phase four-wire includes a pluggable first connector or a pluggable second connector; The first connector is used to connect a three-phase voltage in a three-phase three-wire manner; The second connector is used to connect the three-phase voltage in a three-phase four-wire manner; The power supply detection circuit compatible with three-phase three-wire and three-phase four-wire also includes: A metering circuit connected to the first connector or the second connector and configured to detect the line voltage of the three-phase voltage to generate a detection voltage; a trigger circuit for generating a trigger signal; A control circuit connected to the metering circuit and the trigger circuit, and used to generate a display signal according to the detection voltage and the trigger signal; the display signal carries confirmation information or alarm information; A display component connected to the control circuit and configured to display according to the display signal; The power supply detection circuit compatible with three-phase three-wire and three-phase four-wire also includes: An AC-DC conversion circuit connected to the first connector or the second connector and used to generate DC power according to the three-phase voltage; the trigger signal is a wired communication signal, and the trigger circuit is a wireless communication circuit; The wireless communication circuit is used to generate the wired communication signal according to the wireless communication signal received from the wireless link; The control circuit is specifically used to generate a display signal according to the detection voltage and the wired communication signal; The AC-DC conversion circuit includes a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a first varistor, a second varistor, a third varistor, a fourth varistor, a first resistor, a second resistor and a third resistor; The first end of the first varistor and the first end of the first resistor jointly constitute the A-phase voltage input end of the AC-DC conversion circuit, the first end of the second resistor is the B-phase voltage input end of the AC-DC conversion circuit, the second end of the first varistor and the first end of the third resistor jointly constitute the C-phase voltage input end of the AC-DC conversion circuit, the second end of the first resistor is connected to the first end of the second varistor, the first end of the fourth varistor, the positive electrode of the first diode and the negative electrode of the second diode, the second end of the second resistor is connected to the second end of the second varistor, the first end of the third varistor, the positive electrode of the third diode and the negative electrode of the fourth diode, the second end of the third resistor is connected to the second end of the third varistor, the second end of the fourth varistor, the positive electrode of the fifth diode and the negative electrode of the sixth diode, the negative electrode of the first diode, the negative electrode of the third diode and the negative electrode of the fifth diode jointly constitute the first DC output end of the AC-DC conversion circuit, and the positive electrode of the second diode, the positive electrode of the fourth diode and the positive electrode of the sixth diode jointly constitute the second DC output end of the AC-DC conversion circuit.

2. The power supply detection circuit compatible with three-phase three-wire and three-phase four-wire as claimed in claim 1, characterized in that: The trigger signal is a key signal, and the trigger circuit is a key component; The key component is used to generate a key signal according to user input; The control circuit is specifically configured to generate the display signal according to the detection voltage and the key signal.

3. The power supply detection circuit compatible with three-phase three-wire and three-phase four-wire as claimed in claim 2, characterized in that: The button assembly includes a button, a first capacitor, a fourth resistor and a fifth resistor; The static contact of the button is connected to the first end of the fourth resistor, the first end of the first capacitor and the first end of the fifth resistor, the second end of the fourth resistor is the button signal output end, the normally closed contact of the button is connected to the first power supply, and the normally open contact of the button, the second end of the first capacitor and the second end of the fifth resistor are connected to the power ground.

4. The power supply detection circuit compatible with three-phase three-wire and three-phase four-wire as claimed in claim 1, characterized in that: The first end of the first connector is connected to the A phase voltage of the three-phase voltage, the second end of the first connector is connected to the B phase voltage of the three-phase voltage, the third end of the first connector is connected to the C phase voltage of the three-phase voltage, and the fourth end of the first connector is connected to the power ground.

5. The power supply detection circuit compatible with three-phase three-wire and three-phase four-wire as claimed in claim 1, characterized in that: The first end of the second connector is connected to the A phase voltage of the three-phase voltage, the second end of the second connector is connected to the fourth end of the second connector, the B phase voltage of the three-phase voltage and the power ground, and the third end of the second connector is connected to the C phase voltage of the three-phase voltage.

6. An electric energy meter, characterized in that: The electric energy meter comprises a power supply detection circuit compatible with three-phase three-wire and three-phase four-wire as claimed in any one of claims 1 to 5.

7. A power supply detection method compatible with three-phase three-wire and three-phase four-wire, characterized in that: Based on the power supply detection circuit compatible with three-phase three-wire and three-phase four-wire as described in claims 1 to 5, the detection method includes: Connecting a three-phase voltage in a three-phase three-wire manner using a pluggable first connector, or connecting the three-phase voltage in a three-phase four-wire manner using a pluggable second connector; detecting a line voltage of the three-phase voltage to generate a detection voltage; generating a trigger signal; Generate a display signal according to the detection voltage and the trigger signal; the display signal carries confirmation information or alarm information; Display is performed according to the display signal.

8. The power supply detection method compatible with three-phase three-wire and three-phase four-wire as claimed in claim 7, characterized in that: The trigger signal is a wired communication signal, and the generating trigger signal is specifically: The wireless communication signal received by the wireless link generates the wired communication signal; Generating a display signal according to the detection voltage and the trigger signal is specifically as follows: The display signal is generated according to the detection voltage and the wired communication signal.

9. The power supply detection method compatible with three-phase three-wire and three-phase four-wire as claimed in claim 8, characterized in that: The step of generating a display signal according to the detection voltage and the wired communication signal is specifically: Parameters are configured according to the wired communication signal, and a display signal is generated according to the parameters and the detection voltage.

10. The power supply detection method compatible with three-phase three-wire and three-phase four-wire as claimed in claim 7, characterized in that: The trigger signal is a key signal, and the generation of the trigger signal is specifically: The key component generates a key signal according to the user input; Generating a display signal according to the detection voltage and the trigger signal is specifically as follows: The display signal is generated according to the detection voltage and the key signal.

11. The power supply detection method compatible with three-phase three-wire and three-phase four-wire as claimed in claim 10, characterized in that: Generating the display signal according to the detection voltage and the key signal is specifically as follows: Parameters are configured according to the key signal, and a display signal is generated according to the configuration parameters and the detection voltage.

12. The power supply detection method compatible with three-phase three-wire and three-phase four-wire as claimed in claim 7, characterized in that: After displaying according to the display signal, the method further comprises: The control circuit generates a control signal according to the trigger signal; The metering circuit switches the metering mode according to the control signal.

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