Plugging-free voltage and current detection device

Abstract

The utility model discloses a plugging-free voltage and current detection device, which comprises a voltmeter, an ampere meter, a control module, a measuring meter pen A and a measuring meter pen B, the measuring meter pen A is connected with the ampere meter and serves as one measuring meter pen of the ampere meter; the measuring meter pen B is connected with the ampere meter through a first relay and a second relay which are connected in series and serves as another measuring meter pen of the ampere meter; the measuring meter pen A is connected with the voltmeter and serves as a measuring meter pen of the voltmeter; the measuring meter pen B is connected with the voltmeter through a first relay connected in series and serves as another measuring meter pen of the voltmeter; the first relay and the second relay are respectively connected with the control module. According to the utility model, the actual condition of the circuit is automatically judged through the control module, so that voltage measurement or current measurement is automatically selected, repeated plugging and unplugging of a measurement meter pen are not needed, potential safety hazards possibly brought by repeated plugging and unplugging of the meter pen are avoided, the operation flow of voltage and current measurement is simplified, and the measurement efficiency and safety are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrical measurement, and particularly relates to a voltage and current detection device without plugging and unplugging. Background Art

[0002] During daily production inspection, when detecting current and voltage, since the detection instrument cannot be compatible with both voltage and current measurement at the same time, if the voltage is measured in the current range, the ammeter is likely to be damaged. Therefore, it is necessary to repeatedly plug and unplug the detection pen and adjust the detection range. The repeated plugging and unplugging of the detection pen will undoubtedly bring trouble to the detection process. On the one hand, the detection efficiency is reduced, and on the other hand, there are also certain potential safety hazards.

[0003] Therefore, it is necessary to design a voltage and current detection device that can realize the switching of the detection range without repeatedly plugging and unplugging the detection pen. Summary of the Utility Model

[0004] To solve the above technical problems, the utility model provides a voltage and current detection device without plugging and unplugging.

[0005] The technical solution provided by the utility model is as follows:

[0006] A voltage and current detection device without plugging and unplugging includes a voltmeter, an ammeter and a control module MCU, and also includes a measurement pen A and a measurement pen B;

[0007] The measurement pen A is connected to the ammeter and serves as a measurement pen of the ammeter; the measurement pen B is connected to the ammeter through a series-connected first relay K1 and second relay K2 and serves as another measurement pen of the ammeter; the measurement pen A is connected to the second relay K2 through a series-connected path resistance R1; the connection point between the first relay K1 and the second relay K2 is grounded through a feedback resistance R2, and this connection point is connected to the first analog-to-digital conversion interface ADC1 of the control module MCU;

[0008] The measurement pen A is connected to the voltmeter and serves as a measurement pen of the voltmeter; the measurement pen B is connected to the voltmeter through a series-connected first relay K1 and serves as another measurement pen of the voltmeter; the voltmeter is simultaneously connected to the second analog-to-digital conversion interface ADC2 of the control module MCU;

[0009] The first relay K1 and the second relay K2 are respectively connected to the control module MCU. The first relay K1 is used to control the on-off of the measurement pen B with the voltmeter and the second relay K2. The second relay K2 is used to control the on-off of the feedback resistance R2 with the path resistance R1 and the ammeter;

[0010] The control module MCU is used to control the switching of the first relay K1 and the second relay K2. Its first analog-to-digital conversion interface ADC1 and second analog-to-digital conversion interface ADC2 are both used to detect the voltage at their respective connection points.

[0011] Further, a rectifier bridge is provided on the connection circuit between the voltmeter and the second analog-to-digital conversion interface ADC2 of the control module MCU.

[0012] Further, the rectifier bridge is a bridge circuit composed of four diodes.

[0013] Further, the first relay K1 is connected to the control module MCU through the switching transistor Q2, and the second relay K2 is connected to the control module MCU through the switching transistor Q1.

[0014] Further, a resistor R4 is connected in series on the connection circuit between the first relay K1 and the control module MCU, and a resistor R3 is connected in series on the connection circuit between the second relay K2 and the control module MCU.

[0015] Further, the control module MCU is also externally connected with an automatic control button and a manual control button. The automatic control button is used to automatically switch between current measurement and voltage measurement, and the manual control button is used to manually switch between current measurement and voltage measurement.

[0016] Advantages of the present utility model:

[0017] When measuring current and voltage, the present utility model automatically judges the actual circuit condition through the control module, so as to automatically select voltage measurement or current measurement, without repeatedly plugging and unplugging the measuring pen, avoiding potential safety hazards that may be brought about when repeatedly plugging and unplugging the pen, simplifying the operation process of voltage and current measurement, and improving the measurement efficiency and safety. Description of the Drawings

[0018] The drawings are used to provide further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model.

[0019] Figure 1 It is a schematic circuit diagram of the detection device provided by an embodiment of the present utility model. Detailed Embodiments

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0021] Please refer to Figure 1 , this embodiment provides a plug-free voltage and current detection device, which includes a voltmeter, an ammeter, and a control module MCU, and also includes a measurement test lead A and a measurement test lead B.

[0022] Among them, the measurement test lead A is connected to the ammeter and serves as a measurement test lead of the ammeter; the measurement test lead B is connected to the ammeter through a series-connected first relay K1 and second relay K2 and serves as the other measurement test lead of the ammeter. The measurement test lead A is connected to the second relay K2 through a series-connected path resistor R1; the connection point between the first relay K1 and the second relay K2 is grounded through a feedback resistor R2, and this connection point is connected to the first analog-to-digital conversion interface ADC1 of the control module MCU. At the same time, the measurement test lead A is connected to the voltmeter and serves as a measurement test lead of the voltmeter; the measurement test lead B is connected to the voltmeter through a series-connected first relay K1 and serves as the other measurement test lead of the voltmeter; the voltmeter is connected to the second analog-to-digital conversion interface ADC2 of the control module MCU.

[0023] The first relay K1 and the second relay K2 are respectively connected to the control module MCU. The first relay K1 is used to control the on-off of the measurement test lead B with the voltmeter and the second relay K2. The second relay K2 is used to control the on-off of the feedback resistor R2 with the path resistor R1 and the ammeter. The control module MCU is used to control the switching of the first relay K1 and the second relay K2, and its first analog-to-digital conversion interface ADC1 and second analog-to-digital conversion interface ADC2 are both used to detect the voltages at their respective connection points.

[0024] In some embodiments, a rectifier bridge is further provided on the connection circuit between the voltmeter and the second analog-to-digital conversion interface ADC2 of the control module MCU. The rectifier bridge can adopt a bridge circuit composed of four diodes.

[0025] In some embodiments, the first relay K1 is connected to the control module MCU through a switching tube Q2, and the second relay K2 is connected to the control module MCU through a switching tube Q1.

[0026] In some embodiments, a resistor R4 is connected in series on the connection circuit between the first relay K1 and the control module MCU, and a resistor R3 is connected in series on the connection circuit between the second relay K2 and the control module MCU.

[0027] In some embodiments, an automatic control button and a manual control button are also externally connected to the control module MCU. The automatic control button is used to automatically switch between current measurement and voltage measurement, and the manual control button is used to manually switch between current measurement and voltage measurement.

[0028] The usage process and working principle of this voltage and current detection device are as follows:

[0029] When measuring with the test pen, the first relay K1 is in the normally closed state (the test pen B is connected to the voltmeter). At this time, the voltage across the test pen will be transmitted to the voltmeter. Since the working principle of the voltmeter is parallel connection, the circuit does not need to be open. The voltmeter should display the voltage. At this time, the rectifier bridge is also in the working state, and can provide a reference potential for ADC2 to collect to measure whether it is necessary to switch to the current measurement mode.

[0030] When there is no voltage across the test pen and ADC2 does not detect voltage, the MCU will switch the first relay K1 after a certain period of time. At this time, the first relay K1 changes from normally closed to normally open (the test pen B is connected to the second relay K2), and the second relay K2 is normally closed (the feedback resistor R2 is connected to the path resistor R1). The current enters from the test pen, passes through the path resistor R1 to reach the feedback resistor R2, and ADC1 starts to detect whether there is voltage at the feedback resistor R2. If there is voltage at ADC1 at this time, it means that there is current generated on this line, and the second relay K2 switches to the normally open end to enter the ammeter mode (the feedback resistor R2 is connected to the ammeter), and the path resistor R1 is disconnected. At this time, the voltage state at the feedback resistor R2 end is monitored in real time. If the voltage at the resistor end is 0, it means that the current is disconnected, and the states of the first relay K1 and the second relay K2 are switched again to select the voltmeter for voltage measurement.

[0031] Since everyone's usage habits are different, this design also adds manual and automatic modes. The manual mode is to switch to the ammeter or voltmeter by pressing a button, and the automatic mode is for the MCU to automatically execute the above process.

[0032]

[0033] ​Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than limiting it; under the idea of the present utility model, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the present utility model as described above. For the sake of brevity, they are not provided in detail; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A plug-free voltage and current detection device, characterized in that: It includes a voltmeter, an ammeter and a control module MCU, and also includes a measuring pen A and a measuring pen B; The measuring probe A is connected to the ammeter as one measuring probe of the ammeter; the measuring probe B is connected to the ammeter through the first relay K1 and the second relay K2 connected in series as another measuring probe of the ammeter; the measuring probe A is connected to the second relay K2 through the series path resistor R1; the connection point between the first relay K1 and the second relay K2 is grounded after passing through the feedback resistor R2, and the connection point is connected to the first analog-to-digital conversion interface ADC1 of the control module MCU; The measuring probe A is connected to the voltmeter as one measuring probe of the voltmeter; the measuring probe B is connected to the voltmeter through the first relay K1 connected in series as another measuring probe of the voltmeter; the voltmeter is also connected to the second analog-to-digital conversion interface ADC2 of the control module MCU; The first relay K1 and the second relay K2 are connected to the control module MCU respectively, the first relay K1 is used to control the on-off of the measuring pen B and the voltmeter and the second relay K2, and the second relay K2 is used to control the on-off of the feedback resistor R2 and the path resistor R1 and the ammeter; The control module MCU is used to control the switching of the first relay K1 and the second relay K2, and its first analog-to-digital conversion interface ADC1 and the second analog-to-digital conversion interface ADC2 are used to detect the voltage of their respective connection points.

2. A plug-free voltage and current detection device as claimed in claim 1, characterized in that: A rectifier bridge is arranged on the connection circuit between the voltage meter and the second analog-to-digital conversion interface ADC2 of the control module MCU.

3. A plug-free voltage and current detection device as claimed in claim 2, characterized in that: The rectifier bridge is a bridge circuit composed of four diodes.

4. The plug-free voltage and current detection device according to claim 1, characterized in that: The first relay K1 is connected to the control module MCU through the switch tube Q2, and the second relay K2 is connected to the control module MCU through the switch tube Q1.

5. The plug-free voltage and current detection device according to claim 1, characterized in that: A resistor R4 is connected in series to the connection circuit between the first relay K1 and the control module MCU, and a resistor R3 is connected in series to the connection circuit between the second relay K2 and the control module MCU.

6. The plug-free voltage and current detection device according to claim 1, characterized in that: The control module MCU is also externally connected to an automatic control button and a manual control button, wherein the automatic control button is used to automatically switch between current measurement and voltage measurement, and the manual control button is used to manually switch between current measurement and voltage measurement.

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