Current monitoring device

Abstract

The utility model discloses a current monitoring device, relates to the technical field of current detection, the current monitoring device comprises a control module, a current detection module and a current interval identification module, the control module is respectively connected with the current detection module and the current interval identification module, the current interval identification module comprises a first optocoupler and a second optocoupler, when the detected power supply is in a low-current interval, the first optocoupler is conducted, the control module detects a high-level signal through the first optocoupler, and the control module controls the current detection module to be adjusted to a low-current measurement gear. When the detected power supply is in a high-current interval, the second optocoupler is conducted, the control module detects a high-level signal through the second optocoupler, and the control module controls the current detection module to be adjusted to a high-current measurement gear. The current interval can be automatically identified through the first optocoupler and the second optocoupler, then the measurement gear of the current is automatically adjusted, the measurement gear does not need to be manually adjusted, and the accuracy and intelligence of current measurement are improved.

Description

A current monitoring device Technical Field

[0001] This utility model relates to the field of current detection technology, and in particular to a current monitoring device. Background Technology

[0002] Traditional current monitoring devices require manual adjustment of the measurement range before measurement. These ranges include a high current range (measured in amperes (A)) and a low current range (measured in milliamperes (mA)). Forgetting to adjust the range before measurement can lead to inaccurate readings when using the high current range for low currents, while using the low current range for high currents may damage the device, resulting in financial loss. However, adjusting the range before each measurement is extremely inconvenient. Summary of the Invention

[0003] The purpose of this invention is to provide a current monitoring device. This application can automatically identify the current range through the first optocoupler and the second optocoupler, and then automatically adjust the current measurement range without the need for manual adjustment of the measurement range, thereby improving the accuracy and intelligence of current measurement.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] One aspect of this utility model provides a current monitoring device, which includes a control module, a current detection module, and a current range identification module. The control module is connected to the current detection module and the current range identification module. The current range identification module includes a first optocoupler, a first resistor, a second resistor, and a third resistor. The first end of the first resistor and the first end of the second resistor are connected. The second end of the first resistor is used to connect to the positive terminal of the power supply under test. The second end of the second resistor is used to connect to the location of the power supply under test. The light-emitting input terminal of the first optocoupler is connected to the first end of the first resistor and the first end of the second resistor. The light-emitting output terminal of the first optocoupler is connected to the second end of the second resistor. The light-receiving input terminal of the first optocoupler is connected to the positive terminal of the second power supply through the third resistor. The light-receiving output terminal of the first optocoupler is connected to the control module. The system comprises a second optocoupler, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor. The first terminal of the fifth resistor is connected to the first terminal of the sixth resistor. The second terminal of the fifth resistor is connected to the second terminal of the first resistor via the fourth resistor. The second terminal of the sixth resistor is connected to the second terminal of the second resistor. The light-emitting input terminal of the second optocoupler is connected to the first terminals of the fifth and sixth resistors. The light-emitting output terminal of the second optocoupler is connected to the second terminal of the second resistor. The light-receiving input terminal of the second optocoupler is connected to the positive terminal of a second power supply via the seventh resistor. The light-receiving output terminal of the second optocoupler is connected to the control module. When the first optocoupler is working, the control module controls the current detection module to adjust to the first measurement level for current detection. When the second optocoupler is working, the control module controls the current detection module to adjust to the second measurement level for current detection.

[0006] In some embodiments, the current range identification module further includes a first transistor, a second transistor, an eighth resistor, and a ninth resistor. The first end of the eighth resistor is connected to the first end of the ninth resistor, the second end of the eighth resistor is connected to the second end of the first resistor, the collector of the first transistor is connected to the second end of the ninth resistor, the base of the first transistor is connected to the first end of the first resistor and the first end of the second resistor, the emitter of the first transistor is connected to the light-emitting input terminal of the first optocoupler, the collector of the second transistor is connected to the first end of the eighth resistor and the first end of the ninth resistor, the base of the second transistor is connected to the first end of the fifth resistor and the first end of the sixth resistor, and the emitter of the second transistor is connected to the light-emitting input terminal of the second optocoupler.

[0007] In some embodiments, the current range identification module further includes a tenth resistor and an eleventh resistor. One end of the tenth resistor is connected to the light-receiving output terminal of the first optocoupler, and the other end of the tenth resistor is connected to a second location. One end of the eleventh resistor is connected to the light-receiving output terminal of the second optocoupler, and the other end of the eleventh resistor is connected to the second location.

[0008] In some embodiments, the current range identification module further includes a first capacitor and a second capacitor, wherein the first capacitor is connected in parallel with the tenth resistor and the second capacitor is connected in parallel with the eleventh resistor.

[0009] In some embodiments, the current range identification module further includes a battery, which is used to output the positive terminal and the second location of a second power source to supply power to the control module, the current detection module and the current range identification module.

[0010] In some embodiments, the current range identification module further includes a rectifier bridge, a twelfth resistor, a third capacitor, and a fourth capacitor. The positive output terminal of the rectifier bridge is connected to the positive terminal of the third capacitor, the positive terminal of the fourth capacitor, and the second terminal of the first resistor through the twelfth resistor. The negative output terminal of the rectifier bridge is connected to the negative terminal of the third capacitor, the negative terminal of the fourth capacitor, and the second terminal of the second resistor. The two ends of the input terminal of the rectifier bridge are respectively connected to the positive terminal of the power supply under test and the location.

[0011] In some embodiments, the current range identification module further includes a switch, with one end of the switch connected to the two ends of the input terminal of the rectifier bridge, and the other end of the switch connected to the positive terminal of the power supply under test and the location, respectively.

[0012] A current monitoring device according to an embodiment of the present invention has at least the following beneficial effects: A first resistor, a second resistor, a fourth resistor, a fifth resistor, and a sixth resistor form a current shunt, which respectively passes through a first transistor and a second transistor to measure the current. When the first transistor is turned on, the first optocoupler is also turned on, indicating that the measured current value is low; when the second transistor is turned on, the second optocoupler is turned on, and the first optocoupler is turned off, indicating that the measured current value is high. The control module controls the current detection module to adjust the current measurement range according to the conduction status of the first and second optocouplers, eliminating the need for manual adjustment of the measurement range and improving the accuracy and intelligence of current measurement.

[0013] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this disclosure. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 is a circuit diagram of a current monitoring device according to an embodiment. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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.

[0019] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the description of this disclosure will be more complete and fully convey the concept of the exemplary embodiments to those skilled in the art. The drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0020] The technical solutions of the embodiments of this application are briefly described below:

[0021] According to some embodiments, as shown in FIG1, this application provides a current monitoring device. The current monitoring device includes a control module, a current detection module, and a current range identification module. The control module is connected to both the current detection module and the current range identification module. The current range identification module includes a first optocoupler U1, a first resistor R1, a second resistor R2, a third resistor R3, a second optocoupler U2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7. The specific connection method is as follows.

[0022] The first end of the first resistor R1 is connected to the first end of the second resistor R2. The second end of the first resistor R1 is used to connect to the positive terminal of the power supply under test. The second end of the second resistor R2 is used to connect to the location of the power supply under test. The light-emitting input terminal of the first optocoupler U1 is connected to the first end of the first resistor R1 and the first end of the second resistor R2. The light-emitting output terminal of the first optocoupler U1 is connected to the second end of the second resistor R2. The light-receiving input terminal of the first optocoupler U1 is connected to the positive terminal of the second power supply through the third resistor R3. The light-receiving output terminal of the first optocoupler U1 is connected to the control module.

[0023] The first end of the fifth resistor R5 is connected to the first end of the sixth resistor R6. The second end of the fifth resistor R5 is connected to the second end of the first resistor R1 through the fourth resistor R4. The second end of the sixth resistor R6 is connected to the second end of the second resistor R2. The light-emitting input end of the second optocoupler U2 is connected to the first end of the fifth resistor R5 and the first end of the sixth resistor R6. The light-emitting output end of the second optocoupler U2 is connected to the second end of the second resistor R2. The light-receiving input end of the second optocoupler U2 is connected to the positive terminal of the second power supply through the seventh resistor R7. The light-receiving output end of the second optocoupler U2 is connected to the control module.

[0024] When the first optocoupler U1 is working, the control module controls the current detection module to adjust to the first measurement range to detect the current.

[0025] When the second optocoupler U2 is working, the control module controls the current detection module to adjust to the second measurement range to detect the current.

[0026] The working principle of the above embodiment is as follows: when the power supply under test is in the low current range, the first optocoupler U1 is turned on, and the control module detects a high-level signal through the first optocoupler U1. The control module then controls the current detection module to adjust to the low current measurement range. When the power supply under test is in the high current range, the second optocoupler U2 is turned on, and the control module detects a high-level signal through the second optocoupler U2. The control module then controls the current detection module to adjust to the high current measurement range. This application can automatically identify the current range through the first optocoupler U1 and the second optocoupler U2, and then automatically adjust the current measurement range, eliminating the need for manual adjustment of the measurement range and improving the accuracy and intelligence of current measurement.

[0027] The preferred embodiments of this disclosure will be further described in detail below with reference to Figure 1 in this specification.

[0028] According to some embodiments, as shown in Figure 1, the current range identification module further includes a first transistor Q1, a second transistor Q2, an eighth resistor R8, and a ninth resistor R9, with the specific connection method as follows.

[0029] The first terminal of the eighth resistor R8 is connected to the first terminal of the ninth resistor R9. The second terminal of the eighth resistor R8 is connected to the second terminal of the first resistor R1. The collector of the first transistor Q1 is connected to the second terminal of the ninth resistor R9. The base of the first transistor Q1 is connected to the first terminal of the first resistor R1 and the first terminal of the second resistor R2. The emitter of the first transistor Q1 is connected to the light-emitting input terminal of the first optocoupler U1. The collector of the second transistor Q2 is connected to the first terminal of the eighth resistor R8 and the first terminal of the ninth resistor R9. The base of the second transistor Q2 is connected to the first terminal of the fifth resistor R5 and the first terminal of the sixth resistor R6. The emitter of the second transistor Q2 is connected to the light-emitting input terminal of the second optocoupler U2.

[0030] The working principle of the above embodiment is as follows: when the power supply under test is in the low current range, the first transistor Q1 is turned on, the second transistor Q2 is turned off, the first optocoupler U1 is turned on, the control module detects a high-level signal through the first optocoupler U1, and the control module controls the current detection module to adjust to the low current measurement range.

[0031] When the power supply under test is in the high current range, both the first transistor Q1 and the second transistor Q2 are turned on. Because of the ninth resistor R9, the second optocoupler U2 is turned on and the first optocoupler U1 is turned off. The control module detects a high-level signal through the second optocoupler U2 and controls the current detection module to adjust to the high current measurement range.

[0032] The control module of this application can automatically identify the current range through the first transistor Q1, the second transistor Q2, the first optocoupler U1 and the second optocoupler U2, and then automatically adjust the current measurement range without the need for manual adjustment of the measurement range, thereby improving the accuracy and intelligence of current measurement.

[0033] According to some embodiments, as shown in Figure 1, the current range identification module further includes a tenth resistor R10 and an eleventh resistor R11. One end of the tenth resistor R10 is connected to the light-receiving output terminal of the first optocoupler U1, and the other end of the tenth resistor R10 is connected to a second location. One end of the eleventh resistor R11 is connected to the light-receiving output terminal of the second optocoupler U2, and the other end of the eleventh resistor R11 is connected to the second location.

[0034] The tenth resistor R10 is used to provide a low-level signal to the control module when the first optocoupler U1 is turned off, so as to indicate to the control module that the first optocoupler U2 has been turned off; the eleventh resistor R11 is used to provide a low-level signal to the control module when the second optocoupler U2 is turned off, so as to indicate to the control module that the second optocoupler U2 has been turned off.

[0035] According to some embodiments, as shown in Figure 1, the current range identification module further includes a first capacitor C1 and a second capacitor C2. The first capacitor C1 is connected in parallel with the tenth resistor R10, and the second capacitor C2 is connected in parallel with the eleventh resistor R11.

[0036] Among them, the first capacitor C1 and the second capacitor C2 are used for filtering.

[0037] According to some embodiments, as shown in Figure 1, the current range identification module further includes a battery BT, which is used to output the positive terminal and the second location of the second power source to supply power to the control module, the current detection module and the current range identification module.

[0038] According to some embodiments, as shown in Figure 1, the current range identification module further includes a rectifier bridge DB, a twelfth resistor R12, a third capacitor C3, and a fourth capacitor C4. The positive output terminal of the rectifier bridge DB is connected to the positive terminal of the third capacitor C3, the positive terminal of the fourth capacitor C4, and the second terminal of the first resistor R1 through the twelfth resistor R12. The negative output terminal of the rectifier bridge DB is connected to the negative terminal of the third capacitor C3, the negative terminal of the fourth capacitor C4, and the second terminal of the second resistor R2. The two ends of the input terminal of the rectifier bridge DB are respectively connected to the positive terminal of the power supply under test and the location.

[0039] This application includes a rectifier bridge DB, which allows the current monitoring device to measure both AC and DC power sources without requiring time to distinguish between AC and DC current.

[0040] According to some embodiments, as shown in Figure 1, the current range identification module also includes a switch S. One end of the switch S is connected to the two ends of the input terminal of the rectifier bridge DB, and the other end of the switch S is connected to the positive terminal of the power supply under test and the location, respectively.

[0041] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0042] Although this disclosure has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Because this disclosure can be embodied in many forms without departing from the spirit or substance of this application, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A current monitoring device, characterized in that, The current monitoring device includes a control module, a current detection module, and a current range identification module. The control module is connected to both the current detection module and the current range identification module. The current range identification module includes a first optocoupler, a first resistor, a second resistor, and a third resistor. The first end of the first resistor is connected to the first end of the second resistor. The second end of the first resistor is used to connect to the positive terminal of the power supply under test. The second end of the second resistor is used to connect to the location of the power supply under test. The light-emitting input terminal of the first optocoupler is connected to the first ends of the first and second resistors. The light-emitting output terminal of the first optocoupler is connected to the second end of the second resistor. The light-receiving input terminal of the first optocoupler is connected to the positive terminal of the second power supply through the third resistor. The light-receiving output terminal of the first optocoupler is connected to the control module. The second optocoupler, a fourth resistor, and a fifth resistor are also included. The system includes a fifth resistor, a sixth resistor, and a seventh resistor. The first end of the fifth resistor is connected to the first end of the sixth resistor. The second end of the fifth resistor is connected to the second end of the first resistor via the fourth resistor. The second end of the sixth resistor is connected to the second end of the second resistor. The light-emitting input terminal of the second optocoupler is connected to the first ends of the fifth and sixth resistors. The light-emitting output terminal of the second optocoupler is connected to the second end of the second resistor. The light-receiving input terminal of the second optocoupler is connected to the positive terminal of the second power supply via the seventh resistor. The light-receiving output terminal of the second optocoupler is connected to the control module. When the first optocoupler is working, the control module controls the current detection module to adjust to the first measurement level for current detection. When the second optocoupler is working, the control module controls the current detection module to adjust to the second measurement level for current detection.

2. The current monitoring device according to claim 1, characterized in that, The current range identification module further includes a first transistor, a second transistor, an eighth resistor, and a ninth resistor. The first end of the eighth resistor is connected to the first end of the ninth resistor, and the second end of the eighth resistor is connected to the second end of the first resistor. The collector of the first transistor is connected to the second end of the ninth resistor, the base of the first transistor is connected to the first end of the first resistor and the first end of the second resistor, the emitter of the first transistor is connected to the light-emitting input terminal of the first optocoupler, the collector of the second transistor is connected to the first end of the eighth resistor and the first end of the ninth resistor, the base of the second transistor is connected to the first end of the fifth resistor and the first end of the sixth resistor, and the emitter of the second transistor is connected to the light-emitting input terminal of the second optocoupler.

3. The current monitoring device according to claim 1, characterized in that, The current range identification module further includes a tenth resistor and an eleventh resistor. One end of the tenth resistor is connected to the light-receiving output terminal of the first optocoupler, and the other end of the tenth resistor is connected to a second location. One end of the eleventh resistor is connected to the light-receiving output terminal of the second optocoupler, and the other end of the eleventh resistor is connected to the second location.

4. The current monitoring device according to claim 3, characterized in that, The current range identification module further includes a first capacitor and a second capacitor, the first capacitor being connected in parallel with the tenth resistor, and the second capacitor being connected in parallel with the eleventh resistor.

5. The current monitoring device according to claim 1, characterized in that, The current range identification module also includes a battery, which is used to output the positive terminal and the second location of the second power source to supply power to the control module, the current detection module and the current range identification module.

6. The current monitoring device according to claim 1, characterized in that, The current range identification module also includes a rectifier bridge, a twelfth resistor, a third capacitor, and a fourth capacitor. The positive output terminal of the rectifier bridge is connected to the positive terminal of the third capacitor, the positive terminal of the fourth capacitor, and the second terminal of the first resistor through the twelfth resistor. The negative output terminal of the rectifier bridge is connected to the negative terminal of the third capacitor, the negative terminal of the fourth capacitor, and the second terminal of the second resistor. The two ends of the input terminal of the rectifier bridge are respectively connected to the positive terminal of the power supply under test and the location.

7. The current monitoring device according to claim 6, characterized in that, The current range identification module also includes a switch, with one end of the switch connected to the two ends of the input terminal of the rectifier bridge, and the other end of the switch connected to the positive terminal of the power supply under test and the location, respectively.

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