CN220064224U - Alternating voltage measuring circuit - Google Patents
Alternating voltage measuring circuit Download PDFInfo
- Publication number
- CN220064224U CN220064224U CN202321564636.XU CN202321564636U CN220064224U CN 220064224 U CN220064224 U CN 220064224U CN 202321564636 U CN202321564636 U CN 202321564636U CN 220064224 U CN220064224 U CN 220064224U
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- module
- alternating current
- resistor
- probe
- mcu control
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- 238000005070 sampling Methods 0.000 claims abstract description 29
- 239000000523 sample Substances 0.000 claims abstract description 27
- 238000005259 measurement Methods 0.000 claims description 22
- 239000004020 conductor Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 3
- 229910052755 nonmetal Inorganic materials 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 claims description 2
- 238000004088 simulation Methods 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
The utility model discloses an alternating voltage measuring circuit which comprises a probe, a sampling unit, a contact key, an alternating voltage measuring module, an MCU control module, a display and a warning module, wherein the probe is connected with the sampling unit; the probe is used for contacting an alternating current signal to be measured, one end of the sampling unit is connected with the probe, the other end of the sampling unit is connected with one end of the alternating current voltage measuring module, the other end of the alternating current voltage measuring module is connected with the input end of the MCU control module, the output end of the MCU control module is connected with the display and the warning module, the enabling end of the MCU control module is connected with one end of the contact key, and the other end of the contact key is connected with the sampling unit and the alternating current voltage measuring module together and the analog ground end respectively; the device can measure the voltage value of alternating current to the ground by only contacting the measured alternating current point with one probe, does not need to adopt 2 test bars, is convenient to measure the voltage value of a power supply line at any time, is convenient to carry and not easy to lose, and can also set corresponding warning signals that the measured voltage is higher than or lower than a set value.
Description
Technical Field
The utility model relates to the technical field of electric parameter measurement, in particular to an alternating current voltage measurement circuit.
Background
Currently, 2 contact probes are used for measuring the contact alternating voltage (such as a universal meter) in the market, and the event is frequently lost due to inconvenient storage and carrying of the probes. Or because of the phenomenon that the internal wires are open-circuited due to contact winding, no probe is available when a user needs to measure, and the method is very inconvenient.
Disclosure of Invention
The utility model aims to provide an alternating-current voltage measurement circuit, which adopts a single-probe measurement mode and solves the defect that 2 contact probes are needed in the voltage measurement circuit in the prior art.
In order to achieve the above object, the present utility model is as follows:
an alternating voltage measuring circuit comprises a probe, a sampling unit, a contact key, an alternating voltage measuring module, an MCU control module, a display and a warning module; the probe is used for contacting the alternating current signal to be measured, the probe is connected to sampling unit one end, and the other end is connected with alternating current voltage measurement module's one end, alternating current voltage measurement module's the other end is connected with MCU control module's input, MCU control module's output connection display and warning module, MCU control module's enabling end is connected with the one end of contact button, the other end of contact button is connected with the simulation ground terminal together with sampling unit, alternating current voltage measurement module respectively.
Further, the alternating voltage measuring circuit is characterized in that the sampling unit consists of a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected with a probe, the other end of the first resistor R1 is connected with one end of the second resistor R2, and the other end of the second resistor R2 is connected with an analog ground end and the other end of a contact key; the alternating voltage measuring module is connected with the resistor R2 in parallel and used for sampling a voltage signal on the resistor R2.
Further, the alternating voltage measuring circuit is characterized in that: the contact key is provided with an integrated button contact piece made of metal or nonmetal conductive materials.
Further, the alternating voltage measuring circuit is characterized in that the warning module consists of an LED and/or a buzzer, and when the MCU control module detects that the input measured voltage value exceeds a set value, the control signal is output to enable the LED and/or the buzzer to flash and/or emit intermittent sounds to indicate that the measured voltage value exceeds a range.
Further, the alternating voltage measuring circuit is characterized in that: the display is a pen segment type liquid crystal screen.
Compared with the prior art, the utility model has the beneficial effects that: the device can measure the voltage value of alternating current to the ground by only contacting the measured alternating current point with one probe, does not need to adopt 2 test bars, is convenient to measure the voltage value of a power supply line at any time, is convenient to carry and not easy to lose, and can also set corresponding warning signals that the measured voltage is higher than or lower than a set value.
Drawings
Fig. 1 is a block diagram showing an ac voltage measurement circuit according to the present utility model.
Fig. 2 is a schematic diagram of a sampling module of an ac voltage measurement circuit according to the present utility model.
Fig. 3 is an equivalent schematic diagram of a sampling module of an ac voltage measurement circuit according to the present utility model.
Fig. 4 is a touch key diagram of an ac voltage measurement circuit according to the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model; all other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
One embodiment of the utility model:
as shown in fig. 1, the embodiment provides an ac voltage measurement circuit, which includes a probe, a sampling unit, a touch button, an ac voltage measurement module, an MCU control module, a display and a warning module; the probe is used for contacting an alternating current signal to be measured, one end of the sampling unit is connected with the probe, the other end of the sampling unit is connected with one end of the alternating current voltage measuring module, the other end of the alternating current voltage measuring module is connected with the input end of the MCU control module, the output end of the MCU control module is connected with the display and the warning module, the enabling end of the MCU control module is connected with one end of the contact key, and the other end of the contact key is connected with the sampling unit and the alternating current voltage measuring module together and the analog ground end respectively; wherein the alternating voltage measuring circuit has only one measuring probe.
As shown in fig. 2 and 3, the sampling unit is a voltage dividing circuit formed by a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected with a probe, the other end is connected with the second resistor R2, and the other end of the second resistor R2 is connected with an analog ground end and the other end of a contact key; the resistance value of the first resistor R1 is not less than 100MΩ; the third resistor R3 is a human body equivalent resistor;
the contact key is provided with an integrated button contact piece made of metal or nonmetal conductive materials.
The inside of the common button part is a conductor contact piece, and the outside is an insulator. Pressing the key, wherein 2 contacts are connected through the conductor contact sheets in the key to form line conduction; the button contact piece contacting the button part of the button is integrated, only a conductor is used for pressing the button, and the button contact piece part and 2 contacts are connected to form a 3-point circuit which is conducted;
the sampling voltage Vo is the voltage on the second resistor R2 after the voltage Vi to be measured is divided by a voltage dividing circuit composed of the first resistor R1, the second resistor R2, the third resistor R3 (human equivalent resistor) and the capacitor C1 (human ground capacitor).
In the voltage dividing circuit, a second resistor R2 is used as a sampling resistor, and the voltage of the second resistor R2 is transmitted to an alternating current voltage measuring module for measurement;
when the measured voltage value exceeds a set value, the LED luminous tube and/or the buzzer will flash and/or emit intermittent sound to indicate that the measured voltage value exceeds the range;
the alarm module changes the flicker frequency of the LED luminous tube and/or the intermittent sound of the buzzer along with the measured signal, and the larger the measured signal is, the faster the frequency is, and at least three frequencies are provided for distinguishing different measured value levels.
As shown in FIG. 4, when the human body presses the touch button, the two contacts of the touch button are connected, so that the MCU control module sends out related function instructions, and the MCU internally executes corresponding measurement and warning modules and a display to work.
The working principle of the utility model is as follows: the probe is connected to the socket, the tested alternating current signal flows into the sampling unit, one end of the sampling unit is connected with the probe, the other end of the sampling unit is connected with one end of the alternating current voltage measuring module, and the other end of the alternating current voltage measuring module is connected with the input end of the MCU control module; after the contact key is pressed, the sampling voltage Vo is the voltage on the second resistor R2 after the tested alternating current signal is divided by a voltage dividing circuit formed by the first resistor R1, the second resistor R2, the third resistor R3 (human body equivalent resistor) and the capacitor C1 (human body grounding capacitor). The alternating current voltage measuring module is connected with the second resistor R2 in parallel, and under the control of the contact key, a measured alternating current electric signal flows into the MCU control module from the alternating current voltage measuring module; the MCU control module sends out relevant function instructions to enable the warning module and the display to work.
The using process of the alternating current voltage measuring circuit specifically comprises the following steps: after the contact key is pressed, the alternating current voltage measuring circuit is awakened, a probe is connected into the socket, the measured alternating current signal flows into the MCU control module from the sampling element through the contact key, and the MCU control module sends out related function instructions to enable the warning module and the display to work.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the utility model disclosed above are intended only to assist in the explanation of the utility model. The preferred embodiments are not exhaustive or to limit the utility model to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best understand and utilize the utility model. The utility model is limited only by the claims and the full scope and equivalents thereof.
Claims (5)
1. An ac voltage measurement circuit, characterized in that: the device comprises a probe, a sampling unit, a contact key, an alternating voltage measuring module, an MCU control module, a display and a warning module; the probe is used for contacting the alternating current signal to be measured, the probe is connected to sampling unit one end, and the other end is connected with alternating current voltage measurement module's one end, alternating current voltage measurement module's the other end is connected with MCU control module's input, MCU control module's output connection display and warning module, MCU control module's enabling end is connected with the one end of contact button, the other end of contact button is connected with the simulation ground terminal together with sampling unit, alternating current voltage measurement module respectively.
2. The alternating current voltage measurement circuit according to claim 1, wherein the sampling unit is composed of a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected with the probe, the other end is connected with one end of the second resistor R2, and the other end of the second resistor R2 is connected with the analog ground end and the other end of the contact key; the alternating voltage measuring module is connected with the resistor R2 in parallel and used for sampling a voltage signal on the resistor R2.
3. An ac voltage measuring circuit according to claim 1, wherein: the contact key is provided with an integrated button contact piece made of metal or nonmetal conductive materials.
4. The alternating current voltage measurement circuit according to claim 1, wherein the warning module is composed of an LED light-emitting tube and/or a buzzer, and when the MCU control module detects that the input measured voltage value exceeds the set value, the control signal is outputted to make the LED light-emitting tube and/or the buzzer flash light and/or emit intermittent sound to indicate that the measured voltage value is out of range.
5. An ac voltage measuring circuit according to claim 1, wherein: the display is a pen segment type liquid crystal screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321564636.XU CN220064224U (en) | 2023-06-16 | 2023-06-16 | Alternating voltage measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321564636.XU CN220064224U (en) | 2023-06-16 | 2023-06-16 | Alternating voltage measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220064224U true CN220064224U (en) | 2023-11-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321564636.XU Active CN220064224U (en) | 2023-06-16 | 2023-06-16 | Alternating voltage measuring circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220064224U (en) |
-
2023
- 2023-06-16 CN CN202321564636.XU patent/CN220064224U/en active Active
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