A wiring state detection display circuit and a tester

Abstract

The utility model discloses a kind of wiring state detection display circuit and tester, including firewire connector, zero line connector, electrical detection module, control module, display module, first wiring detection module and switch module, the sampling end of power detection module is connected with firewire connector and zero line connector respectively, control module is connected with the output of power detection module and display module respectively, the input of first wiring detection module is connected with firewire connector and zero line connector respectively to detect the first wiring signal indicating first wiring state, control module is connected with the output of first wiring detection module to be able to show first wiring state by display module, the input of switch module is connected with zero line connector, the output of switch module is connected with firewire connector, control module is connected with switch module to control switch module on-off according to first wiring signal, the design is convenient and reliable, reduce the risk of damage to device when misoperation.

Description

Technical Field

[0001] This utility model relates to the field of circuit testing equipment technology, and in particular to a wiring status detection and display circuit and tester. Background Technology

[0002] Existing AC circuit testers typically include a live wire connector, a neutral wire connector, an electrical testing module, a control module, and a display module. The input terminals of the electrical testing module are connected to the live wire connector and the neutral wire connector, respectively, and the output terminal of the electrical testing module is connected to the control module. The live wire connector and the neutral wire connector can be connected to an AC power source, so that the electrical testing module can detect the electrical parameters of the AC power source and display them through the display module. However, during user operation, the live wire connector and the neutral wire connector may be connected incorrectly. For example, if the user mistakenly connects the neutral wire connector to the live wire of the AC power source, the current may impact the electronic components inside the tester, causing damage to the electronic components. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a wiring status detection and display circuit and tester, which is convenient and reliable to use, reducing the risk of damage to components due to misoperation.

[0004] A wiring status detection and display circuit according to a first aspect of the present invention includes: a live wire connector and a neutral wire connector; an electrical detection module, wherein the sampling terminal of the power detection module is connected to the live wire connector and the neutral wire connector respectively to detect electrical parameters; a control module and a display module, wherein the control module is connected to the output terminal of the power detection module and the display module respectively to display electrical parameters through the display module; a first wiring detection module, wherein the input terminal of the first wiring detection module is connected to the live wire connector and the neutral wire connector respectively to detect a first wiring signal characterizing a first wiring status, and the control module is connected to the output terminal of the first wiring detection module to display the first wiring status through the display module; and a switch module, wherein the input terminal of the switch module is connected to the neutral wire connector, the output terminal of the switch module is connected to the live wire connector, and the control module is connected to the switch module to control the switch module to switch on and off according to the first wiring signal.

[0005] A wiring status detection and display circuit according to an embodiment of the present utility model has at least the following beneficial effects:

[0006] This utility model relates to a wiring status detection and display circuit. Users can connect the live wire and neutral wire connectors to the AC power supply to be tested. The first wiring detection module detects the first wiring status of the live and neutral wire connectors and generates a first wiring signal. The control module determines whether to control the switch module to conduct based on the first wiring signal. It is understood that when the first wiring signal indicates a wiring error, i.e., the neutral wire connector is connected to the live wire of the AC power supply, the switch module conducts, discharging the current and preventing current from flowing through the neutral wire connector and impacting the internal electronic components. This design is convenient and reliable, reducing the risk of damage to devices due to misoperation.

[0007] According to some embodiments of this utility model, the wiring status detection and display circuit further includes a ground wire connector, a second wiring detection module, and a third wiring detection module. The sampling end of the electrical detection module is also connected to the ground wire connector. The input end of the second wiring detection module is connected to the live wire connector and the ground wire connector respectively to detect a second wiring signal representing a second wiring status. The input end of the third wiring detection module is connected to the neutral wire connector and the ground wire connector respectively to detect a third wiring signal representing a third wiring status. The control module is connected to the second wiring detection module and the third wiring detection module respectively so that the second wiring status and the third wiring status can be displayed through the display module.

[0008] According to some embodiments of this utility model, the first wiring detection module includes a diode D3, an optocoupler OCT9, a resistor R13, and a capacitor C10. The positive terminal of the diode D3 is connected to the live wire connector, the negative terminal of the diode D3 is connected to the input terminal of the light emitter of the optocoupler OCT9, the output terminal of the light emitter of the optocoupler OCT9 is connected to the first end of the resistor R12, the last end of the resistor R12 is connected to the neutral wire connector, the input terminal of the light receiver of the optocoupler OCT9 is connected to the first end of the resistor R13, the first end of the capacitor C10, and the control module, respectively, the last end of the resistor R13 is connected to the power supply, and the last end of the capacitor C10 and the output terminal of the light receiver of the optocoupler OCT9 are grounded.

[0009] According to some embodiments of the present invention, the switching module includes an auxiliary load unit and a switching unit. The auxiliary load unit and the switching unit are connected to form a discharge branch. The first end of the discharge branch is connected to the live wire connector, and the last end of the discharge branch is connected to the neutral wire connector. The control module is connected to the controlled end of the switching unit.

[0010] According to some embodiments of the present invention, the auxiliary load unit includes multiple resistive elements, which are connected in series or in parallel.

[0011] According to some embodiments of the present invention, the switch module further includes an optocoupler OCT2, the input terminal of the photodetector of the optocoupler is connected to the power supply, the output terminal of the photodetector of the optocoupler is connected to the controlled terminal of the switch unit, the input terminal of the light emitter of the optocoupler is connected to the control module, and the output terminal of the light emitter of the optocoupler is grounded.

[0012] According to some embodiments of the present invention, the switching module further includes a Zener diode Z1 and a capacitor C1. The negative terminal of the Zener diode Z1 is connected to the first end of the capacitor C1, the input terminal of the photodetector of the optocoupler, and the power supply, respectively. The positive terminal of the Zener diode Z1 and the tail end of the capacitor C1 are grounded.

[0013] According to some embodiments of the present invention, the electrical detection module includes one or more of a voltage detection unit, a zero-crossing detection unit, and a current detection unit.

[0014] The tester according to a second aspect of the present invention includes the wiring status detection and display circuit disclosed in any of the above embodiments.

[0015] The testing instrument according to the embodiments of this utility model has at least the following beneficial effects:

[0016] The present invention uses the wiring status detection and display circuit disclosed in any of the above embodiments, which is convenient and reliable to use and reduces the risk of damage to the device due to misoperation.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic block diagram of one embodiment of the wiring status detection and display circuit of this utility model;

[0020] Figure 2 This is a circuit diagram of the control module of one embodiment of the wiring status detection and display circuit of this utility model;

[0021] Figure 3 This is a schematic diagram of a first wiring detection module, a first wiring detection module, and a circuit diagram of a first wiring detection module, according to one embodiment of the wiring status detection and display circuit of this utility model.

[0022] Figure 4A circuit diagram of an electrical detection module for one embodiment of a wiring status detection and display circuit;

[0023] Figure 5 This is a circuit diagram of a switch module in one embodiment of a wiring status detection and display circuit.

[0024] Figure label:

[0025] Live wire connector 110; Neutral wire connector 120; Ground wire connector 130; Electrical detection module 200; Control module 300; Display module 400; First wiring detection module 510; Second wiring detection module 520; Third wiring detection module 530; Switch module 600; Auxiliary load unit 610; Switch unit 620. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] like Figures 1 to 5 As shown, a wiring status detection and display circuit according to a first aspect embodiment of the present invention includes a live wire connector 110, a neutral wire connector 120, an electrical detection module 200, a control module 300, a display module 400, a first wiring detection module 510, and a switch module 600. The sampling terminal of the power detection module is connected to the live wire connector 110 and the neutral wire connector 120 respectively to detect electrical parameters. The control module 300 is connected to the output terminal of the power detection module and the display module 400 respectively to display electrical parameters through the display module 400. The input terminals of the wiring detection module 510 are connected to the live wire connector 110 and the neutral wire connector 120 respectively to detect the first wiring signal characterizing the first wiring state. The control module 300 is connected to the output terminal of the first wiring detection module 510 so that the first wiring state can be displayed by the display module 400. The input terminal of the switch module 600 is connected to the neutral wire connector 120, and the output terminal of the switch module 600 is connected to the live wire connector 110. The control module 300 is connected to the switch module 600 to control the switch module 600 to switch on and off according to the first wiring signal.

[0031] The control module 300 may include a conventional MCU or CPU and its auxiliary circuits, and the display module 400 may be a digital tube display screen, an LCD display screen, etc. In some embodiments of this utility model, the electrical detection module 200 includes one or more of a voltage detection unit, a zero-crossing detection unit, and a current detection unit. The voltage detection unit, zero-crossing detection unit, and current detection unit may be conventionally composed of discrete components. For example, they may include sampling resistors, voltage divider resistors, etc., to constitute the voltage detection unit and the current detection unit, and they may include optocouplers to constitute the zero-crossing detection unit. Specifically, such as... Figure 4 As shown, the voltage detection unit, zero-crossing detection unit, and current detection unit can also be directly integrated detection chips.

[0032] Both the live wire connector 110 and the neutral wire connector 120 can be connected with wires, making it convenient for users to connect to the output terminal of AC power.

[0033] This utility model relates to a wiring status detection and display circuit. Users can connect the live wire connector 110 and the neutral wire connector 120 to the AC power supply to be tested. The first wiring detection module 510 detects the first wiring status of the live wire connector 110 and the neutral wire connector 120, generating a first wiring signal. The control module 300 determines whether to control the switch module 600 to conduct based on the first wiring signal. It is understood that when the first wiring signal indicates a wiring error, i.e., the neutral wire connector 120 is connected to the live wire of the AC power supply, the switch module 600 conducts, discharging the current and preventing current from passing through the neutral wire connector 120 and impacting the internal electronic components. This design is convenient and reliable, reducing the risk of damage to devices due to misoperation.

[0034] In some embodiments of this utility model, the wiring status detection and display circuit further includes a ground wire connector 130, a second wiring detection module 520, and a third wiring detection module 530. The sampling terminal of the electrical detection module 200 is also connected to the ground wire connector 130. The input terminal of the second wiring detection module 520 is connected to the live wire connector 110 and the ground wire connector 130 respectively to detect the second wiring signal representing the second wiring status. The input terminal of the third wiring detection module 530 is connected to the neutral wire connector 120 and the ground wire connector 130 respectively to detect the third wiring signal representing the third wiring status. The control module 300 is connected to the second wiring detection module 520 and the third wiring detection module 530 respectively so that the second wiring status and the third wiring status can be displayed by the display module 400.

[0035] Some AC power supplies also include a ground output terminal. The electrical detection module 200 can detect phase-to-phase voltage, leakage current, etc. The second wiring detection module 520 generates a second wiring signal, and the third wiring detection module 530 generates a third wiring signal. This allows it to be determined whether there is a wiring error between the live wire connector 110, the neutral wire connector 120, and the ground wire connector 130.

[0036] In some embodiments of this utility model, such as Figure 3As shown, the first wiring detection module 510 includes a diode D3, an optocoupler OCT9, a resistor R13, and a capacitor C10. The positive terminal of the diode D3 is connected to the live wire connector 110, and the negative terminal of the diode D3 is connected to the input terminal of the light emitter of the optocoupler OCT9. The output terminal of the light emitter of the optocoupler OCT9 is connected to the first end of the resistor R12, and the last end of the resistor R12 is connected to the neutral wire connector 120. The input terminal of the light receiver of the optocoupler OCT9 is connected to the first end of the resistor R13, the first end of the capacitor C10, and the control module 300, respectively. The last end of the resistor R13 is connected to the power supply, and the last end of the capacitor C10 and the output terminal of the light receiver of the optocoupler OCT9 are grounded.

[0037] Specifically, the first, second, and third wiring signals can all be level signals. The control module 300 can determine the wiring status based on the first, second, and third wiring signals. For example, if the first wiring signal is low, the second wiring signal is high, and the third wiring signal is low, it indicates that the live wire connector 110 and the neutral wire connector 120 are reversed with the neutral and live wires, respectively. If the first wiring signal is high, the second wiring signal is low, and the third wiring signal is low, it indicates that the live wire connector 110 and the ground wire connector 130 are reversed with the ground and live wires, respectively. If the first connection signal is high and the third connection signal is high, it indicates that the ground wire connector 130 is not connected to the ground wire. If the first connection signal is high, the second connection signal is high, and the third connection signal is high, it indicates that the live wire connector 110 is not connected to the live wire. If the first connection signal is low, the second connection signal is high, and the third connection signal is high, it indicates that the live wire connector 110 is not connected to the live wire. If the first connection signal is low, the second connection signal is low, and the third connection signal is high, it indicates that the live wire connector 110, the neutral wire connector 120, and the ground wire connector 130 are all correctly connected to the neutral wire, the live wire, and the ground wire, respectively.

[0038] In some embodiments of this utility model, such as Figure 5 As shown, the switch module 600 includes an auxiliary load unit 610 and a switch unit 620. The auxiliary load unit 610 and the switch unit 620 are connected to form a discharge branch. The first end of the discharge branch is connected to the live wire connector 110, and the last end of the discharge branch is connected to the neutral wire connector 120. The control module 300 is connected to the controlled end of the switch unit 620.

[0039] Specifically, the switching unit 620 may include a semiconductor switching transistor Q1, and the switching transistor Q1 and the auxiliary load unit 610 form at least a partial discharge branch.

[0040] When the live wire connector 110 and the neutral wire connector 120 are connected incorrectly, the control module 300 controls the switch unit 620 to conduct. In order to prevent current from flowing directly into the neutral wire and causing a short circuit, an auxiliary load unit 610 is added. The auxiliary load unit 610 can discharge and consume electrical energy without causing a large impact on the downstream electronic components.

[0041] Specifically, such as Figure 5 As shown, the auxiliary load unit 610 includes multiple resistors, which are connected in series or in parallel.

[0042] In some embodiments of this utility model, the switch module 600 further includes an optocoupler OCT2. The input terminal of the photodetector of the optocoupler is connected to the power supply, the output terminal of the photodetector of the optocoupler is connected to the controlled terminal of the switch unit 620, the input terminal of the light emitter of the optocoupler is connected to the control module 300, and the output terminal of the light emitter of the optocoupler is grounded.

[0043] The optocoupler OCT2 isolates the control module 300 from the controlled terminal of the switch module 600, preventing interference signals or current surges from the switch module 600 from entering the control module 300, thus ensuring stable and reliable control by the control module 300.

[0044] In some embodiments of this utility model, the switching module 600 further includes a Zener diode Z1 and a capacitor C1. The negative terminal of the Zener diode Z1 is connected to the first end of the capacitor C1, the input terminal of the photodetector of the optocoupler, and the power supply, respectively. The positive terminal of the Zener diode Z1 and the tail end of the capacitor C1 are grounded.

[0045] Zener diode Z1 and capacitor C1 can provide a stable voltage to the photodetector of the optocoupler, ensuring that the control module 300 can sensitively drive the switching transistor Q1 to conduct when it outputs a signal.

[0046] The tester according to a second aspect of the present invention includes the wiring status detection and display circuit disclosed in any of the above embodiments.

[0047] The present invention uses the wiring status detection and display circuit disclosed in any of the above embodiments, which is convenient and reliable to use and reduces the risk of damage to the device due to misoperation.

[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A wiring status detection and display circuit, characterized in that, include: Live wire connector and neutral wire connector; The sampling terminals of the electrical detection module and the power detection module are connected to the live wire connector and the neutral wire connector respectively to detect electrical parameters; The system includes a control module and a display module. The control module is connected to the output of the power detection module and the display module, respectively, so that telecommunications parameters can be displayed through the display module. The first wiring detection module has its input terminals connected to the live wire connector and the neutral wire connector respectively to detect a first wiring signal that characterizes the first wiring state. The control module is connected to the output terminal of the first wiring detection module so that the first wiring state can be displayed through the display module. A switch module, wherein the input terminal of the switch module is connected to the neutral wire connector, the output terminal of the switch module is connected to the live wire connector, and the control module is connected to the switch module to control the switch module to switch on and off according to the first wiring signal.

2. The wiring status detection and display circuit according to claim 1, characterized in that, It also includes a ground wire connector, a second wiring detection module, and a third wiring detection module. The sampling end of the electrical detection module is also connected to the ground wire connector. The input end of the second wiring detection module is connected to the live wire connector and the ground wire connector respectively to detect the second wiring signal representing the second wiring state. The input end of the third wiring detection module is connected to the neutral wire connector and the ground wire connector respectively to detect the third wiring signal representing the third wiring state. The control module is connected to the second wiring detection module and the third wiring detection module respectively so that the second wiring state and the third wiring state can be displayed through the display module.

3. The wiring status detection and display circuit according to claim 1, characterized in that, The first wiring detection module includes a diode D3, an optocoupler OCT9, a resistor R13, and a capacitor C10. The positive terminal of the diode D3 is connected to the live wire connector, and the negative terminal of the diode D3 is connected to the input terminal of the emitter of the optocoupler OCT9. The output terminal of the emitter of the optocoupler OCT9 is connected to the first end of the resistor R12, and the last end of the resistor R12 is connected to the neutral wire connector. The input terminal of the receiver of the optocoupler OCT9 is connected to the first end of the resistor R13, the first end of the capacitor C10, and the control module, respectively. The last end of the resistor R13 is connected to the power supply, and the last end of the capacitor C10 and the output terminal of the receiver of the optocoupler OCT9 are grounded.

4. The wiring status detection and display circuit according to claim 1, characterized in that, The switching module includes an auxiliary load unit and a switching unit. The auxiliary load unit and the switching unit are connected to form a discharge branch. The first end of the discharge branch is connected to the live wire connector, and the last end of the discharge branch is connected to the neutral wire connector. The control module is connected to the controlled end of the switching unit.

5. The wiring status detection and display circuit according to claim 4, characterized in that, The auxiliary load unit includes multiple resistive elements, which are connected in series or in parallel.

6. The wiring status detection and display circuit according to claim 4, characterized in that, The switching module also includes an optocoupler OCT2. The input terminal of the photodetector of the optocoupler is connected to the power supply, the output terminal of the photodetector of the optocoupler is connected to the controlled terminal of the switching unit, the input terminal of the light emitter of the optocoupler is connected to the control module, and the output terminal of the light emitter of the optocoupler is grounded.

7. The wiring status detection and display circuit according to claim 6, characterized in that, The switching module also includes a Zener diode Z1 and a capacitor C1. The negative terminal of the Zener diode Z1 is connected to the first end of the capacitor C1, the input terminal of the photodetector of the optocoupler, and the power supply, respectively. The positive terminal of the Zener diode Z1 and the tail end of the capacitor C1 are grounded.

8. The wiring status detection and display circuit according to claim 6, characterized in that, The electrical detection module includes one or more of the following: a voltage detection unit, a zero-crossing detection unit, and a current detection unit.

9. A testing instrument, characterized in that, Includes the wiring status detection and display circuit as described in any one of claims 1 to 8.

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