Socket test circuit and socket tester

By designing the socket testing circuit, using diodes and transistors to detect the socket wiring status, and achieving automatic feedback through analog switches, the problem of cumbersome and high cost of detecting the socket wiring status in the prior art is solved, and efficient, safe and simple socket testing is achieved.

CN222913775UActive Publication Date: 2025-05-27ZHANGZHOU YUSHAN ELECTRONIC MFG CO LTD
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Patent Information

Application Number
CN202421641849.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-11
Publication Date
2025-05-27
Estimated Expiration
2034-07-11

AI Technical Summary

Technical Problem

When detecting the wiring status of the socket, existing socket testers need to use expensive optocouplers or chips of multiple AD ports, and users need to refer to the comparison table to confirm the wiring status, which is cumbersome.

Method used

A socket testing circuit is designed, including a first current flow circuit, a second current flow circuit, a third current flow circuit, a first detection circuit, a second detection circuit and a third detection circuit. The connection between the live wire, ground wire and neutral wire of the socket is detected through components such as diodes and transistors, and intelligent detection and automatic feedback are realized through analog switches.

Benefits of technology

The wiring conditions of the three plugs of the socket are detected without the need for a microcontroller, which saves costs and enhances the safety of the circuit. It has a simple structure and comprehensive functions. It can effectively detect various performance indicators of the socket and reduces the error of manual judgment.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to a socket test circuit and a socket tester. The socket test circuit comprises a three-hole pin, a first current flow circuit, a second current flow circuit, a third current flow circuit, a first detection circuit, a second detection circuit, a third detection circuit and an analog switch. The first detection circuit is used for detecting the voltage of the first current flowing circuit and sending an enable signal to the input end of the analog switch; the second detection circuit is used for detecting the voltage of the second current flowing circuit and sending an enable signal to the input end of the analog switch; the third detection circuit is used for detecting the voltage of the third current flowing circuit and sending an enable signal to the input end of the analog switch; the analog switch is used for controlling a circuit measurement result; therefore, the purposes of detecting the wiring conditions of the three plugs of the socket and measuring the wiring sequence of the socket without a single-chip microcomputer are achieved, and the cost can be saved.
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Description

Technical Field

[0001] The utility model relates to a socket test circuit and a socket tester, belonging to the field of circuit technology. Background Art

[0002] A socket tester is a portable test instrument dedicated to measuring the wiring status of a socket, which is very suitable for the installation and maintenance of household circuits. In the related art, usually three expensive optocouplers are used to detect the wiring sequence of the socket. Another method is to use a chip with multiple AD ports as the main control unit. In addition, a combination of three LED indicators is used to display the wiring status of the socket, but the user needs to refer to a comparison table to confirm the wiring status, which is a bit cumbersome. Content of the Utility Model

[0003] In order to solve the problems existing in the above-mentioned prior art, the utility model provides a socket test circuit and a socket tester.

[0004] The technical solution of the utility model is as follows:

[0005] The utility model provides a socket test circuit, which includes a first current flow circuit, a second current flow circuit, a third current flow circuit, a first detection circuit, a second detection circuit and a third detection circuit;

[0006] The contact L and the contact E are connected through a resistor R4. The first current flow circuit includes a diode D1. The anode of the diode D1 is connected to the contact L, and the cathode is connected to the contact N through a resistor R1 and a resistor R11 connected in series in sequence. The second current flow circuit includes a diode D2. The anode of the diode D2 is connected to the contact E, and the cathode is connected to the contact N through a resistor R2 and a resistor R21 connected in series in sequence. The third current flow circuit includes a diode D3. The anode of the diode D3 is connected to the contact E, and the cathode is connected to the contact N through a resistor R3 and a resistor R31 connected in series in sequence.

[0007] The first detection circuit includes a triode Q1. The base of the triode Q1 is connected to the connection point of the resistor R1 and the resistor R11. The emitter is connected to the contact N, and the collector is connected to the positive pole of the power supply through a resistor R12.

[0008] The second detection circuit includes a triode Q2. The base of the triode Q2 is connected to the connection point of the resistor R2 and the resistor R21. The emitter is connected to the contact N, and the collector is connected to the positive pole of the power supply through a resistor R22.

[0009] The third detection circuit includes a triode Q3. The base of the triode Q2 is connected to the connection point of the resistor R3 and the resistor R31. The emitter is connected to the contact N, and the collector is connected to the positive pole of the power supply through a resistor R32.

[0010] The contact N is grounded.

[0011] As a preferred embodiment of the present utility model, it further includes a three - prong plug, and the three prongs of the three - prong plug are respectively connected to the contact L, the contact E, and the contact N.

[0012] As a preferred embodiment of the present utility model, it further includes an analog switch of model 74HC4051D.

[0013] As a preferred embodiment of the present utility model, the 11 - pin of the analog switch is connected to the collector of the triode Q1;

[0014] The 10 - pin of the analog switch is connected to the collector of the triode Q2;

[0015] The 9 - pin of the analog switch is connected to the collector of the triode Q3;

[0016] The 6 - pin of the analog switch is grounded;

[0017] The 8 - pin of the analog switch is grounded;

[0018] The 16 - pin of the analog switch is connected to the positive pole of the power supply. The positive pole of the power supply is connected to the positive pole of the battery BT1, the cathode of the battery is grounded, the positive pole of the power supply is also connected to the capacitor C1, and the other end of the capacitor C1 is grounded;

[0019] The 7 - pin of the analog switch is grounded;

[0020] The 3 - pin of the analog switch is grounded;

[0021] The 13 - pin of the analog switch is connected to the cathode of the diode LED1. The anode of the diode LED1 is connected to one end of the resistor R14, and the other end of the resistor R14 is connected to the positive pole of the power supply;

[0022] The 14 - pin of the analog switch is connected to the cathode of the diode LED2. The anode of the diode LED2 is connected to one end of the resistor R18, and the other end of the resistor R18 is connected to the positive pole of the power supply;

[0023] The 15 - pin of the analog switch is connected to the cathode of the diode LED3. The anode of the diode LED3 is connected to one end of the resistor R15, and the other end of the resistor R15 is connected to the positive pole of the power supply;

[0024] The 2 - pin of the analog switch is connected to the cathode of the diode LED4. The anode of the diode LED4 is connected to one end of the resistor R17, and the other end of the resistor R17 is connected to the positive pole of the power supply;

[0025] The 4 - pin of the analog switch is connected to the cathode of the diode LED5. The anode of the diode LED5 is connected to one end of the resistor R18, and the other end of the resistor R18 is connected to the positive pole of the power supply.

[0026] The present utility model also provides a socket tester, which includes a first current flow circuit, a second current flow circuit, a third current flow circuit, a first detection circuit, a second detection circuit and a third detection circuit;

[0027] The contact L and the contact E are connected through a resistor R4. The first current flow circuit includes a diode D1. The anode of the diode D1 is connected to the contact L, and the cathode is connected to the contact N through the resistors R1 and R11 connected in series in sequence. The second current flow circuit includes a diode D2. The anode of the diode D2 is connected to the contact E, and the cathode is connected to the contact N through the resistors R2 and R21 connected in series in sequence. The third current flow circuit includes a diode D3. The anode of the diode D3 is connected to the contact E, and the cathode is connected to the contact N through the resistors R3 and R31 connected in series in sequence.

[0028] The first detection circuit includes a triode Q1. The base of the triode Q1 is connected to the connection point of the resistors R1 and R11. The emitter is connected to the contact N, and the collector is connected to the positive power supply through a resistor R12.

[0029] The second detection circuit includes a triode Q2. The base of the triode Q2 is connected to the connection point of the resistors R2 and R21. The emitter is connected to the contact N, and the collector is connected to the positive power supply through a resistor R22.

[0030] The third detection circuit includes a triode Q3. The base of the triode Q2 is connected to the connection point of the resistors R3 and R31. The emitter is connected to the contact N, and the collector is connected to the positive power supply through a resistor R32.

[0031] The contact N is grounded.

[0032] As a preferred embodiment of the present utility model, it further includes a three-pin plug. The three pins of the three-pin plug are respectively connected to the contact L, the contact E and the contact N.

[0033] As a preferred embodiment of the present utility model, it further includes an analog switch of model 74HC4051D.

[0034] As a preferred embodiment of the present utility model, the 11th pin of the analog switch is connected to the collector of the triode Q1;

[0035] The 10th pin of the analog switch is connected to the collector of the triode Q2;

[0036] The 9th pin of the analog switch is connected to the collector of the triode Q3;

[0037] The 6th pin of the analog switch is grounded;

[0038] The 8th pin of the analog switch is grounded;

[0039] The 16 - pin of the analog switch is connected to the positive pole of the power supply. The positive pole of the power supply is connected to the positive pole of the battery BT1, the cathode of the battery is grounded, the positive pole of the power supply is also connected to the capacitor C1, and the other end of the capacitor C1 is grounded;

[0040] The 7 - pin of the analog switch is grounded;

[0041] The 3 - pin of the analog switch is grounded;

[0042] The 13 - pin of the analog switch is connected to the cathode of the diode LED1. The anode of the diode LED1 is connected to one end of the resistor R14, and the other end of the resistor R14 is connected to the positive pole of the power supply;

[0043] The 14 - pin of the analog switch is connected to the cathode of the diode LED2. The anode of the diode LED2 is connected to one end of the resistor R18, and the other end of the resistor R18 is connected to the positive pole of the power supply;

[0044] The 15 - pin of the analog switch is connected to the cathode of the diode LED3. The anode of the diode LED3 is connected to one end of the resistor R15, and the other end of the resistor R15 is connected to the positive pole of the power supply;

[0045] The 2 - pin of the analog switch is connected to the cathode of the diode LED4. The anode of the diode LED4 is connected to one end of the resistor R17, and the other end of the resistor R17 is connected to the positive pole of the power supply;

[0046] The 4 - pin of the analog switch is connected to the cathode of the diode LED5. The anode of the diode LED5 is connected to one end of the resistor R18, and the other end of the resistor R18 is connected to the positive pole of the power supply.

[0047] The utility model has the following beneficial effects:

[0048] 1. The utility model can detect the wiring conditions of the three plugs of the socket; it can be used for measuring the wiring sequence of the socket without a single - chip microcomputer, which can save costs.

[0049] 2. The utility model designs a fourth current - flowing circuit connected to the plug L pin and the plug E pin through the resistor R4 to share the voltage, enhancing the safety of the circuit.

[0050] 3. The overall test circuit of the utility model has a simple structure, relatively low component costs, but comprehensive functions, and can effectively detect various performance indicators of the socket.

[0051] 4. The first, second, and third detection circuits of the utility model respectively detect the voltages of their respective current - flowing circuits, and convert the detection results into enable signals through components such as triodes and transmit them to the analog switch. This method realizes the intelligent detection and automatic feedback of the circuit, reducing the error of manual judgment.

[0052] 5. The utility model improves the comprehensiveness and accuracy of testing by designing the first, second, and third current flow circuits to independently detect the connection conditions between the live wire (L), ground wire (E), and neutral wire (N) of the socket. Each circuit uses a combination of a unidirectional conducting diode and a resistor to ensure the singularity and safety of current flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a schematic circuit diagram of the utility model.

[0054] Figure 2 It is a wiring diagram of the display module of the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0055] Next, the technical solutions in the embodiments of the utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the utility model without making creative efforts belong to the scope of protection of the utility model.

[0056] It should be understood that the step numbers used in the text are only for convenient description and do not limit the execution order of the steps.

[0057] It should be understood that the terms used in the specification of the utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in the specification of the utility model and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0058] The terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0059] The term "and / or" refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0060] Embodiment 1:

[0061] Refer to Figure 1 , the utility model provides a socket test circuit, including a first current flow circuit, a second current flow circuit, a third current flow circuit, a first detection circuit, a second detection circuit, and a third detection circuit;

[0062] The contact L and the contact E are connected through the resistor R4 to achieve voltage sharing. The first current flow circuit includes a diode D1. The anode of the diode D1 is connected to the contact L, and the cathode is connected to the contact N through the resistors R1 and R11 connected in series in sequence, forming a complete loop. The second current flow circuit includes a diode D2. The anode of the diode D2 is connected to the contact E, and the cathode is connected to the contact N through the resistors R2 and R21 connected in series in sequence, forming a complete loop. The third current flow circuit includes a diode D3. The anode of the diode D3 is connected to the contact E, and the cathode is connected to the contact N through the resistors R3 and R31 connected in series in sequence, forming a complete loop.

[0063] The first detection circuit includes a triode Q1. The base of the triode Q1 is connected to the connection point of the resistors R1 and R11. The emitter is connected to the contact N, and the collector is connected to the positive pole of the power supply through the resistor R12, for detecting the voltage of the first current flow circuit and outputting a control signal to send an enabling signal to the A port of the analog switch.

[0064] The second detection circuit includes a triode Q2. The base of the triode Q2 is connected to the connection point of the resistors R2 and R21. The emitter is connected to the contact N, and the collector is connected to the positive pole of the power supply through the resistor R22, for detecting the voltage of the second current flow circuit and outputting a control signal to send an enabling signal to the B port of the analog switch.

[0065] The third detection circuit includes a triode Q3. The base of the triode Q2 is connected to the connection point of the resistors R3 and R31. The emitter is connected to the contact N, and the collector is connected to the positive pole of the power supply through the resistor R32, for detecting the voltage of the third current flow circuit and outputting a control signal to send an enabling signal to the C port of the analog switch.

[0066] The contact N is grounded.

[0067] As a preferred embodiment of the present invention, it further includes a three-pin plug. The three pins of the three-pin plug are respectively connected to the contact L, the contact E, and the contact N, for accessing the socket circuit to be tested.

[0068] See Figure 2 , as a preferred embodiment of the present invention, it further includes an analog switch of model 74HC4051D, for controlling the output of the measurement result of the socket circuit.

[0069] As a preferred embodiment of the present invention, the 11th pin of the analog switch is connected to the collector of the triode Q1;

[0070] The 10th pin of the analog switch is connected to the collector of the triode Q2;

[0071] The 9th pin of the analog switch is connected to the collector of the triode Q3;

[0072] The 6-pin of the analog switch is grounded;

[0073] The 8-pin of the analog switch is grounded;

[0074] The 16-pin of the analog switch is connected to the positive pole of the power supply. The positive pole of the power supply is connected to the positive pole of the battery BT1, the cathode of the battery is grounded, the positive pole of the power supply is also connected to the capacitor C1, and the other end of the capacitor C1 is grounded;

[0075] The 7-pin of the analog switch is grounded;

[0076] The 3-pin of the analog switch is grounded;

[0077] The 13-pin of the analog switch is connected to the cathode of the diode LED1. The anode of the diode LED1 is connected to one end of the resistor R14, and the other end of the resistor R14 is connected to the positive pole of the power supply;

[0078] The 14-pin of the analog switch is connected to the cathode of the diode LED2. The anode of the diode LED2 is connected to one end of the resistor R18, and the other end of the resistor R18 is connected to the positive pole of the power supply;

[0079] The 15-pin of the analog switch is connected to the cathode of the diode LED3. The anode of the diode LED3 is connected to one end of the resistor R15, and the other end of the resistor R15 is connected to the positive pole of the power supply;

[0080] The 2-pin of the analog switch is connected to the cathode of the diode LED4. The anode of the diode LED4 is connected to one end of the resistor R17, and the other end of the resistor R17 is connected to the positive pole of the power supply;

[0081] The 4-pin of the analog switch is connected to the cathode of the diode LED5. The anode of the diode LED5 is connected to one end of the resistor R18, and the other end of the resistor R18 is connected to the positive pole of the power supply.

[0082] The diodes LED1, LED2, LED3, LED4 and LED5 are used to display the measurement results.

[0083] See Figure 1 , The present utility model also provides a socket tester, which includes a first current flow circuit, a second current flow circuit, a third current flow circuit, a first detection circuit, a second detection circuit and a third detection circuit;

[0084] The contact L and the contact E are connected through the resistor R4 to achieve voltage sharing. The first current flow circuit includes a diode D1. The anode of the diode D1 is connected to the contact L, and the cathode is connected to the contact N through the resistors R1 and R11 connected in series in sequence, forming a complete loop. The second current flow circuit includes a diode D2. The anode of the diode D2 is connected to the contact E, and the cathode is connected to the contact N through the resistors R2 and R21 connected in series in sequence, forming a complete loop. The third current flow circuit includes a diode D3. The anode of the diode D3 is connected to the contact E, and the cathode is connected to the contact N through the resistors R3 and R31 connected in series in sequence, forming a complete loop.

[0085] The first detection circuit includes a triode Q1. The base of the triode Q1 is connected to the connection point of the resistors R1 and R11. The emitter is connected to the contact N, and the collector is connected to the positive power supply through the resistor R12, for detecting the voltage of the first current flow circuit and outputting a control signal to send an enable signal to the A port of the analog switch.

[0086] The second detection circuit includes a triode Q2. The base of the triode Q2 is connected to the connection point of the resistors R2 and R21. The emitter is connected to the contact N, and the collector is connected to the positive power supply through the resistor R22, for detecting the voltage of the second current flow circuit and outputting a control signal to send an enable signal to the B port of the analog switch.

[0087] The third detection circuit includes a triode Q3. The base of the triode Q2 is connected to the connection point of the resistors R3 and R31. The emitter is connected to the contact N, and the collector is connected to the positive power supply through the resistor R32, for detecting the voltage of the third current flow circuit and outputting a control signal to send an enable signal to the C port of the analog switch.

[0088] The contact N is grounded.

[0089] As a preferred embodiment of the present invention, it further includes a three-pin plug. The three pins of the three-pin plug are respectively connected to the contact L, the contact E, and the contact N, for accessing the socket circuit to be tested.

[0090] See Figure 2 , as a preferred embodiment of the present invention, it further includes an analog switch of model 74HC4051D, for controlling the output of the measurement result of the socket circuit.

[0091] As a preferred embodiment of the present invention, the 11th pin of the analog switch is connected to the collector of the triode Q1;

[0092] The 10th pin of the analog switch is connected to the collector of the triode Q2;

[0093] The 9th pin of the analog switch is connected to the collector of the triode Q3;

[0094] The 6-pin of the analog switch is grounded;

[0095] The 8-pin of the analog switch is grounded;

[0096] The 16-pin of the analog switch is connected to the positive pole of the power supply. The positive pole of the power supply is connected to the positive pole of the battery BT1, the cathode of the battery is grounded, the positive pole of the power supply is also connected to the capacitor C1, and the other end of the capacitor C1 is grounded;

[0097] The 7-pin of the analog switch is grounded;

[0098] The 3-pin of the analog switch is grounded;

[0099] The 13-pin of the analog switch is connected to the cathode of the diode LED1. The anode of the diode LED1 is connected to one end of the resistor R14, and the other end of the resistor R14 is connected to the positive pole of the power supply;

[0100] The 14-pin of the analog switch is connected to the cathode of the diode LED2. The anode of the diode LED2 is connected to one end of the resistor R18, and the other end of the resistor R18 is connected to the positive pole of the power supply;

[0101] The 15-pin of the analog switch is connected to the cathode of the diode LED3. The anode of the diode LED3 is connected to one end of the resistor R15, and the other end of the resistor R15 is connected to the positive pole of the power supply;

[0102] The 2-pin of the analog switch is connected to the cathode of the diode LED4. The anode of the diode LED4 is connected to one end of the resistor R17, and the other end of the resistor R17 is connected to the positive pole of the power supply;

[0103] The 4-pin of the analog switch is connected to the cathode of the diode LED5. The anode of the diode LED5 is connected to one end of the resistor R18, and the other end of the resistor R18 is connected to the positive pole of the power supply.

[0104] The diodes LED1, LED2, LED3, LED4 and LED5 are used to display the measurement results.

[0105] Embodiment 2:

[0106] The resistance value of the resistor R4 is the same as that of the resistors R1, R2 and R3. The resistance value of the resistor R31 is half of the resistance value of the resistor R21.

[0107] After the socket tester is connected to the socket, the current enters from the live wire, passes through the above-mentioned diode D1, resistor R1 and resistor R11 devices, and then flows out from the neutral wire to form a complete loop. When the voltage across the resistor R11 is higher than 0.7V, the triode Q1 will conduct, so that the A port of the analog switch is at a low level.

[0108] When the socket lacks a ground wire, current enters from the live wire, passes through the above-mentioned resistor R4, diode D3, resistors R3 and R31, and then flows out from the neutral wire to form a complete circuit. When the voltage across resistor R31 is higher than 0.7V, the triode Q3 will conduct, causing the C port of the analog switch to be at a low level. Current enters from the live wire, passes through the above-mentioned resistor R4, diode D2, resistors R2 and R21, and then flows out from the neutral wire to form a complete circuit. Due to the effect of resistor R4, half of the voltage is divided, making the voltage across resistor R21 lower than 0.7V, and the triode Q2 will not conduct, causing the B port of the analog switch to be at a high level.

[0109] Current enters from the ground wire, passes through the above-mentioned diode D2, resistors R2 and R21, and then flows out from the neutral wire to form a complete circuit. Since the voltage between the neutral wire and the ground wire is low, when the voltage across resistor R21 is lower than 0.7V, the triode Q2 will not conduct, causing the B port of the analog switch to be at a low level. After passing through the above-mentioned diode D3, resistors R3 and R31, and then flowing out from the neutral wire to form a complete circuit. Since the voltage between the neutral wire and the ground wire is low, when the voltage across resistor R31 is lower than 0.7V, the triode Q3 will not conduct, causing the C port of the analog switch to be at a low level.

[0110] Truth table of the common analog switch (74HC4051) (in the following table: 0 represents input low level; 1 represents input high level; X represents any input state):

[0111]

[0112] The present invention also provides a socket tester for automatically detecting the wiring of the above socket, including the following steps:

[0113] S1: In a normal power supply system, since the voltage between the neutral wire and the ground wire is very small, and the voltage of the live wire relative to the neutral wire / ground wire is 220V.

[0114] S2: If the L pin of the plug is connected to the live wire, the N pin of the plug is connected to the neutral wire, and the E pin of the plug is connected to the ground wire, then the states of the A port, B port, and C port of the analog switch are low level, high level, and high level. The X6 pin of the analog switch is connected to X, thus turning on the LED4 indicator.

[0115] S3: If the L pin of the plug is connected to the neutral wire, the N pin of the plug is connected to the live wire, and the E pin of the plug is connected to the ground wire, then the states of the A port, B port, and C port of the analog switch are low level, low level, and low level. The X0 pin of the analog switch is connected to X, thus turning on the LED1 indicator.

[0116] S4: If the grounding pin of the plug L is connected to the ground wire, the neutral pin of the plug N is connected to the neutral wire, and the live pin of the plug E is connected to the live wire, then the states of ports A, B, and C of the analog switch are high level, low level, and low level. The X1 pin of the analog switch is conducted with X, thereby lighting up the LED2 indicator.

[0117] S5: If the live pin of the plug L is connected to the live wire, the neutral pin of the plug N is connected to the neutral wire, and the live pin of the plug E is suspended, then the states of ports A, B, and C of the analog switch are low level, high level, and low level. The X2 pin of the analog switch is conducted with X, thereby lighting up the LED3 indicator.

[0118] S6: If the live pin of the plug L is connected to the live wire, the neutral pin of the plug N is suspended, and the grounding pin of the plug E is connected to the ground wire, then the states of ports A, B, and C of the analog switch are high level, high level, and high level. The X7 pin of the analog switch is conducted with X, thereby lighting up the LED5 indicator.

[0119] S7: Then the analog switch converts the wiring sequence of the socket through the states of ports A, B, and C.

[0120] In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent the situation of A existing alone, A and B existing simultaneously, and B existing alone. Where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after. "At least one of the following" and its similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0121] The above are only the embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A socket test circuit, characterized in that: including a first current flow circuit, a second current flow circuit, a third current flow circuit, a first detection circuit, a second detection circuit, and a third detection circuit; The contact L is connected to the contact E through the resistor R4, the first current flow circuit includes a diode D1, the anode of the diode D1 is connected to the contact L, and the cathode is connected to the contact N through the resistors R1 and R11 connected in series; the second current flow circuit includes a diode D2, the anode of the diode D2 is connected to the contact E, and the cathode is connected to the contact N through the resistors R2 and R21 connected in series; the third current flow circuit includes a diode D3, the anode of the diode D3 is connected to the contact E, and the cathode is connected to the contact N through the resistors R3 and R31 connected in series; The first detection circuit includes a transistor Q1, the base of the transistor Q1 is connected to the connection point of the resistor R1 and the resistor R11, the emitter is connected to the contact N, and the collector is connected to the positive electrode of the power supply through the resistor R12; The second detection circuit includes a transistor Q2, the base of the transistor Q2 is connected to the connection point of the resistor R2 and the resistor R21, the emitter is connected to the contact N, and the collector is connected to the positive electrode of the power supply through the resistor R22; The third detection circuit includes a transistor Q3, the base of the transistor Q2 is connected to the connection point of the resistor R3 and the resistor R31, the emitter is connected to the contact N, and the collector is connected to the positive electrode of the power supply through the resistor R32; The contact N is grounded.

2. A socket test circuit according to claim 1, characterized in that: It also includes a three-hole plug, and the three pins of the three-hole plug are connected to the contact L, the contact E, and the contact N respectively.

3. A socket test circuit according to claim 1, characterized in that: Also included is a model 74HC4051D analog switch.

4. A socket test circuit according to claim 3, characterized in that: Pin 11 of the analog switch is connected to the collector of transistor Q1; Pin 10 of the analog switch is connected to the collector of transistor Q2; Pin 9 of the analog switch is connected to the collector of transistor Q3; Pin 6 of the analog switch is grounded; Pin 8 of the analog switch is grounded; The 16-pin of the analog switch is connected to the positive electrode of the power supply, the positive electrode of the power supply is connected to the positive electrode of the battery BT1, the cathode of the battery is grounded, the positive electrode of the power supply is also connected to the capacitor C1, and the other end of the capacitor C1 is grounded; Pin 7 of the analog switch is grounded; Pin 3 of the analog switch is grounded; Pin 13 of the analog switch is connected to the cathode of the diode LED1, the anode of the diode LED1 is connected to one end of the resistor R14, and the other end of the resistor R14 is connected to the positive electrode of the power supply; Pin 14 of the analog switch is connected to the cathode of the diode LED2, the anode of the diode LED2 is connected to one end of the resistor R18, and the other end of the resistor R18 is connected to the positive electrode of the power supply; Pin 15 of the analog switch is connected to the cathode of the diode LED3, the anode of the diode LED3 is connected to one end of the resistor R15, and the other end of the resistor R15 is connected to the positive electrode of the power supply; Pin 2 of the analog switch is connected to the cathode of the diode LED4, the anode of the diode LED4 is connected to one end of the resistor R17, and the other end of the resistor R17 is connected to the positive electrode of the power supply; Pin 4 of the analog switch is connected to the cathode of the diode LED5, the anode of the diode LED5 is connected to one end of the resistor R18, and the other end of the resistor R18 is connected to the positive electrode of the power supply.

5. A socket tester, characterized in that: including a first current flow circuit, a second current flow circuit, a third current flow circuit, a first detection circuit, a second detection circuit, and a third detection circuit; The contact L is connected to the contact E through the resistor R4, the first current flow circuit includes a diode D1, the anode of the diode D1 is connected to the contact L, and the cathode is connected to the contact N through the resistors R1 and R11 connected in series; the second current flow circuit includes a diode D2, the anode of the diode D2 is connected to the contact E, and the cathode is connected to the contact N through the resistors R2 and R21 connected in series; the third current flow circuit includes a diode D3, the anode of the diode D3 is connected to the contact E, and the cathode is connected to the contact N through the resistors R3 and R31 connected in series; The first detection circuit includes a transistor Q1, the base of the transistor Q1 is connected to the connection point of the resistor R1 and the resistor R11, the emitter is connected to the contact N, and the collector is connected to the positive electrode of the power supply through the resistor R12; The second detection circuit includes a transistor Q2, the base of the transistor Q2 is connected to the connection point of the resistor R2 and the resistor R21, the emitter is connected to the contact N, and the collector is connected to the positive electrode of the power supply through the resistor R22; The third detection circuit includes a transistor Q3, the base of the transistor Q2 is connected to the connection point of the resistor R3 and the resistor R31, the emitter is connected to the contact N, and the collector is connected to the positive electrode of the power supply through the resistor R32; The contact N is grounded.

6. A socket tester according to claim 5, characterized in that: It also includes a three-hole plug, and the three pins of the three-hole plug are connected to the contact L, the contact E, and the contact N respectively.

7. A socket tester according to claim 5, characterized in that: Also included is a model 74HC4051D analog switch.

8. A socket tester according to claim 7, characterized in that: Pin 11 of the analog switch is connected to the collector of transistor Q1; Pin 10 of the analog switch is connected to the collector of transistor Q2; Pin 9 of the analog switch is connected to the collector of transistor Q3; Pin 6 of the analog switch is grounded; Pin 8 of the analog switch is grounded; The 16-pin of the analog switch is connected to the positive electrode of the power supply, the positive electrode of the power supply is connected to the positive electrode of the battery BT1, the cathode of the battery is grounded, the positive electrode of the power supply is also connected to the capacitor C1, and the other end of the capacitor C1 is grounded; Pin 7 of the analog switch is grounded; Pin 3 of the analog switch is grounded; Pin 13 of the analog switch is connected to the cathode of the diode LED1, the anode of the diode LED1 is connected to one end of the resistor R14, and the other end of the resistor R14 is connected to the positive electrode of the power supply; Pin 14 of the analog switch is connected to the cathode of the diode LED2, the anode of the diode LED2 is connected to one end of the resistor R18, and the other end of the resistor R18 is connected to the positive electrode of the power supply; Pin 15 of the analog switch is connected to the cathode of the diode LED3, the anode of the diode LED3 is connected to one end of the resistor R15, and the other end of the resistor R15 is connected to the positive electrode of the power supply; Pin 2 of the analog switch is connected to the cathode of the diode LED4, the anode of the diode LED4 is connected to one end of the resistor R17, and the other end of the resistor R17 is connected to the positive electrode of the power supply; Pin 4 of the analog switch is connected to the cathode of the diode LED5, the anode of the diode LED5 is connected to one end of the resistor R18, and the other end of the resistor R18 is connected to the positive electrode of the power supply.