CN220289728U - Electrical contact temperature measuring circuit and device - Google Patents
Electrical contact temperature measuring circuit and device Download PDFInfo
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- CN220289728U CN220289728U CN202321489161.2U CN202321489161U CN220289728U CN 220289728 U CN220289728 U CN 220289728U CN 202321489161 U CN202321489161 U CN 202321489161U CN 220289728 U CN220289728 U CN 220289728U
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Abstract
The utility model discloses an electric contact temperature measuring circuit and device, and relates to the technical field of electric equipment. The electric contact temperature measuring circuit comprises a voltage difference measuring module, a current measuring module, a metering chip and a main control module, wherein the voltage difference measuring module is used for acquiring the voltage difference of the upper side and the lower side of an electric contact of electric equipment; the current measurement module is used for obtaining loop current of the electric equipment; the metering chip is respectively and electrically connected with the voltage difference measuring module and the current measuring module, and is used for obtaining heating power of the electrical contact according to the voltage difference and the loop current; the main control module is electrically connected with the metering chip. According to the electric contact temperature measuring circuit, the voltage difference between two sides of the electric contact is obtained through the voltage difference measuring module, the loop current of the electric equipment is obtained through the current measuring module, and the heating power of the electric contact can be calculated through the metering chip, so that the heating power of the electric contact is monitored in real time, and the temperature of the electric contact is prevented from being too high.
Description
Technical Field
The utility model relates to the technical field of electric equipment, in particular to an electric contact temperature measuring circuit and an electric contact temperature measuring device.
Background
Equipment such as high-low voltage switch cabinet, equipment is ageing easily after long-term operation, and the electrical contact of equipment probably contacts poorly, and then leads to the electrical contact of equipment to generate heat, and the temperature exceeds appointed scope, and this can cause the potential safety hazard, leads to equipment to be burnt.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the electric contact temperature measuring circuit and the device, which can monitor the heating power of the electric contact of the equipment in real time.
In one aspect, an electrical contact temperature measurement circuit according to an embodiment of the present utility model includes:
the voltage difference measuring module is used for obtaining the voltage difference of the upper side and the lower side of the electrical contact of the electric equipment;
the current measurement module is used for obtaining the loop current of the electric equipment;
the metering chip is respectively and electrically connected with the voltage difference measuring module and the current measuring module, and is used for obtaining the heating power of the electrical contact according to the voltage difference and the loop current;
and the main control module is electrically connected with the metering chip.
According to some embodiments of the utility model, the voltage difference measurement module comprises:
the first voltage dividing unit comprises a plurality of first resistors which are connected in series and a plurality of second resistors which are connected in series, wherein a first end of each of the plurality of first resistors which are connected in series is electrically connected with the upper side of the A-phase electrical contact, a first end of each of the plurality of second resistors which are connected in series is electrically connected with the lower side of the A-phase electrical contact, a second end of each of the plurality of first resistors which are connected in series is electrically connected with the metering chip, a second end of each of the plurality of second resistors which are connected in series is electrically connected with the metering chip, and a plurality of third resistors which are connected in series are arranged between the second end of each of the plurality of first resistors which are connected in series and the second end of each of the plurality of second resistors which are connected in series;
the second voltage division unit comprises a plurality of fourth resistors which are mutually connected in series and a plurality of fifth resistors which are mutually connected in series, wherein the first ends of the fourth resistors which are mutually connected in series are electrically connected with the upper side of the B-phase electrical contact, the first ends of the fifth resistors which are mutually connected in series are electrically connected with the lower side of the B-phase electrical contact, the second ends of the fourth resistors which are mutually connected in series are electrically connected with the metering chip, the second ends of the fifth resistors which are mutually connected in series are electrically connected with the metering chip, and a plurality of sixth resistors which are mutually connected in series are arranged between the second ends of the fourth resistors which are mutually connected in series and the second ends of the second resistors which are mutually connected in series;
the third voltage dividing unit comprises a plurality of seventh resistors which are mutually connected in series and a plurality of eighth resistors which are mutually connected in series, wherein the first ends of the seventh resistors which are mutually connected in series are electrically connected with the upper side of the C-phase electrical contact, the first ends of the eighth resistors which are mutually connected in series are electrically connected with the lower side of the C-phase electrical contact, the second ends of the seventh resistors which are mutually connected in series are electrically connected with the metering chip, the second ends of the eighth resistors which are mutually connected in series are electrically connected with the metering chip, and a plurality of ninth resistors which are mutually connected in series are arranged between the second ends of the seventh resistors which are mutually connected in series and the second ends of the eighth resistors which are mutually connected in series.
According to some embodiments of the present utility model, the second ends of the plurality of first resistors connected in series with each other are further grounded through a first capacitor, and the second ends of the plurality of second resistors connected in series with each other are further grounded through a second capacitor; the second ends of the fourth resistors which are connected in series are grounded through a third capacitor, and the second ends of the fifth resistors which are connected in series are grounded through a fourth capacitor; the second ends of the seventh resistors which are connected in series are grounded through a fifth capacitor, and the second ends of the eighth resistors which are connected in series are grounded through a sixth capacitor.
According to some embodiments of the utility model, the current measurement module comprises a current transformer.
According to some embodiments of the utility model, the electrical contact temperature measurement circuit further comprises a power module for providing operating power to the metering chip and the main control module.
According to some embodiments of the utility model, the power supply module comprises a first voltage conversion unit for converting alternating current mains into a 9V voltage and a 5V voltage, and a second voltage conversion unit for converting the 9V voltage into a 3.3V voltage.
According to some embodiments of the utility model, a crystal oscillator is also connected to the metrology chip.
According to some embodiments of the utility model, the electrical contact temperature measurement circuit further comprises an alarm module electrically connected with the main control module.
According to some embodiments of the utility model, the alarm module comprises an indicator light or a buzzer.
On the other hand, the electrical contact temperature measuring device according to the embodiment of the utility model comprises the electrical contact temperature measuring circuit according to the embodiment of the aspect.
The electrical contact temperature measuring circuit and the electrical contact temperature measuring device have the following advantages: the voltage difference between two sides of the electrical contact is obtained through the voltage difference measuring module, the loop current of the electric equipment is obtained through the current measuring module, the heating power of the electrical contact can be calculated through the multiplier in the metering chip, and the result is sent to the main control module, so that the heating power of the electrical contact is monitored in real time, and the equipment is prevented from being burnt due to overhigh temperature of the electrical contact.
Additional aspects and advantages of the utility model 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 utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic block diagram of an electrical contact temperature measurement circuit according to an embodiment of the present utility model;
FIG. 2 is a schematic circuit diagram of a voltage difference measurement module according to an embodiment of the utility model;
FIG. 3 is a schematic circuit diagram of a metering chip according to an embodiment of the present utility model;
FIG. 4 is a schematic circuit diagram of a master control module according to an embodiment of the present utility model;
FIG. 5 is a schematic circuit diagram of a power module according to an embodiment of the utility model;
reference numerals:
the voltage difference measuring module 100, the first voltage dividing unit 110, the second voltage dividing unit 120, the third voltage dividing unit 130, the current measuring module 200, the metering chip 300, the main control module 400, the power module 500, the first voltage converting unit 510, the second voltage converting unit 520, and the alarm module 600.
Detailed Description
Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.
In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
On the one hand, as shown in fig. 1, the electrical contact temperature measuring circuit according to the embodiment of the utility model includes a voltage difference measuring module 100, a current measuring module 200, a metering chip 300 and a main control module 400, where the voltage difference measuring module 100 is used to obtain the voltage difference between the upper and lower sides of the electrical contact of the electrical equipment; the current measurement module 200 is used for obtaining loop current of electric equipment; the metering chip 300 is electrically connected with the voltage difference measuring module 100 and the current measuring module 200 respectively, and the metering chip 300 is used for obtaining heating power of the electrical contact according to the voltage difference and the loop current; the main control module 400 is electrically connected with the metering chip 300.
According to the electric contact temperature measuring circuit provided by the embodiment of the utility model, the voltage difference between two sides of the electric contact is obtained through the voltage difference measuring module 100, and then the loop current of the electric equipment is obtained through the current measuring module 200, namely, the heating power of the electric contact can be calculated through the multiplier in the metering chip 300, and the result is sent to the main control module 400, so that the main control module 400 can judge whether the heating temperature of the electric equipment is too high or not and has potential safety hazards, the real-time monitoring of the heating power of the electric contact is realized, and the equipment is prevented from being burnt due to the too high temperature of the electric contact.
Specifically, as shown in fig. 2, in some embodiments of the present utility model, the voltage difference measurement module 100 includes a first voltage division unit 110, a second voltage division unit 120, and a third voltage division unit 130; the first voltage dividing unit 110 includes a plurality of first resistors (i.e., resistor R11, resistor R12, resistor R13, and resistor R14) and a plurality of second resistors (i.e., resistor R21, resistor R22, resistor R23, and resistor R24) that are connected in series, the first ends of the plurality of first resistors (i.e., the first ends of the resistor R11) that are connected in series are electrically connected with the upper side (Ua) of the a-phase electrical contact, the first ends of the plurality of second resistors (i.e., the first ends of the resistor R21) that are connected in series are electrically connected with the lower side (Ua') of the a-phase electrical contact, the second ends of the plurality of first resistors (i.e., the second ends of the resistor R14) that are connected in series are electrically connected with the metering chip 300 (V6P), the second ends of the plurality of second resistors (i.e., the second ends of the resistor R24) that are connected in series are electrically connected with the metering chip 300 (V6N), and the third resistors (i.e., the third ends of the resistor R31) that are connected in series between the second ends of the plurality of second resistors (i.e., the second ends of the resistor R14) and the second ends of the resistor R32). The second voltage dividing unit 120 includes a plurality of fourth resistors (i.e., resistor R41, resistor R42, resistor R43, and resistor R44) and a plurality of fifth resistors (i.e., resistor R51, resistor R52, resistor R53, and resistor R54) that are connected in series, a first end of the plurality of fourth resistors (i.e., a first end of the resistor R41) that is connected in series is electrically connected to an upper side (Ub) of the B-phase electrical contact, a first end of the plurality of fifth resistors (i.e., a first end of the resistor R51) that is connected in series is electrically connected to a lower side (Ub') of the B-phase electrical contact, a second end of the plurality of fourth resistors (i.e., a second end of the resistor R44) that is connected in series is electrically connected to the metering chip 300 (V4P), a second end of the plurality of fifth resistors (i.e., a second end of the resistor R54) that is connected in series is electrically connected to the metering chip 300 (V4N), and a second end of the plurality of fourth resistors (i.e., a second end of the resistor R44) that is connected in series is electrically connected in series to a second end of the plurality of second resistors (i.e., a second end of the resistor R54) that is connected in series to the second end of the second resistor R). The third voltage dividing unit 130 includes a plurality of seventh resistors (i.e., resistor R71, resistor R72, resistor R73, and resistor R74) and a plurality of eighth resistors (i.e., resistor R81, resistor R82, resistor R83, and resistor R84) that are connected in series, a first end of the plurality of seventh resistors (i.e., a first end of the resistor R71) that is connected in series is electrically connected to an upper side (Uc) of the C-phase electrical contact, a first end of the plurality of eighth resistors (i.e., a first end of the resistor R81) that is connected in series is electrically connected to a lower side (Uc') of the C-phase electrical contact, a second end of the plurality of seventh resistors (i.e., a second end of the resistor R74) that is connected in series is electrically connected to the metering chip 300, a second end of the plurality of eighth resistors (i.e., a second end of the resistor R84) that is connected in series is electrically connected to the metering chip 300, and a ninth resistor (i.e., a ninth resistor R92) that is connected in series is provided between a second end of the plurality of seventh resistors that is connected in series to the second end of eighth resistor (i.e., a second end of the resistor R74) and a second end of the resistor R84). The connection point between the resistor R31 and the resistor R32 is grounded, the connection point between the resistor R61 and the resistor R62 is grounded, and the connection point between the resistor R91 and the resistor R92 is grounded. The number of the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor, and the ninth resistor may be set according to actual needs, and is not limited thereto.
In addition, the second end of the resistor R14 is grounded through the first capacitor C1, and the second end of the resistor R24 is grounded through the second capacitor C2; the second end of the resistor R44 is grounded through a third capacitor C3, and the second end of the resistor R54 is grounded through a fourth capacitor C4; the second end of the resistor R74 is further grounded via a fifth capacitor C5, and the second end of the resistor R84 is further grounded via a sixth capacitor C6. The first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5 and the sixth capacitor C6 have filtering effects, and can filter interference signals.
The first voltage dividing unit 110, the second voltage dividing unit 120 and the third voltage dividing unit 130 detect A, B, C voltages of three-phase electrical contacts by means of voltage division through a resistor network, respectively, ua, ub and Uc are connected to upper ends of the corresponding electrical contacts, ua ', ub ' and Uc ' are connected to lower ends of the corresponding electrical contacts, and then voltage division is performed through a resistor network of a loop, a voltage difference dropped across the electrical contacts is obtained, and the voltage difference is transmitted to the metering chip 300.
As shown in fig. 3, in the embodiment of the present utility model, the metering chip 300 is an SOC chip of the type ATT70222EU, but other types of metering chips may be used. The measuring chip 300 is also connected to a crystal oscillator X1, and the crystal oscillator X1 is used for providing a crystal oscillator signal for the measuring chip 300. The current measurement module includes a current transformer (not shown) for detecting a loop current of the electric device and transmitting the detected current signal to the metering chip 300 through V1P, V3P, V P. The metering chip 300 is internally provided with a multiplier, and after obtaining the voltage difference signal sent by the voltage difference measurement module 100 and the current signal sent by the current measurement module 200, the metering chip 300 calculates loop heating power of the electric equipment through the multiplier and sends the result to the main control module 400. As shown in fig. 4, the main control module 400 includes a single-chip microcomputer U1, and the U1 is responsible for controlling the operation state of the whole circuit and the data interaction with each module.
As shown in fig. 1, in some embodiments of the present utility model, the electrical contact temperature measurement circuit further includes a power module 500, where the power module 500 is configured to provide an operating power supply for the metering chip 300 and the main control module 400.
Specifically, as shown in fig. 5, in some embodiments of the present utility model, the power module 500 includes a first voltage conversion unit 510 for converting alternating current mains into 9V voltage and 5V voltage, and a second voltage conversion unit 520 for converting 9V voltage into 3.3V voltage. As shown in fig. 5, the first voltage converting unit 510 includes a DC-DC chip Power1, the Power1 is connected to 220V ac mains through a L, N pin, and then converts the 220V ac mains into 9V voltage +9vdc and 5V voltage s+5v, and provides a working voltage of 5V for the main control module 400; the second voltage converting unit 520 includes a DC-DC chip U4 for converting 9V voltage +9vdc into 3.3V voltage +3.3V, providing the operation voltage of 3.3V to the metering chip 300.
As shown in fig. 1, in some embodiments of the present utility model, the electrical contact temperature measurement circuit further includes an alarm module 600, and the alarm module 600 is electrically connected with the main control module 400. When the heating power calculated by the metering chip 300 exceeds a preset value, the main control module 400 can alarm through the alarm module 600, thereby reminding a worker to check and process in time. Specifically, the alarm module 600 includes an indicator light or a buzzer, and may alarm by lighting the indicator light or sounding the buzzer.
On the other hand, the utility model also provides an electric contact temperature measuring device which comprises the electric contact temperature measuring circuit.
According to the electrical contact temperature measuring device provided by the embodiment of the utility model, by adopting the electrical contact temperature measuring circuit, the abnormal condition of heating of the electrical contact of the electric equipment can be more rapidly found by monitoring the real-time heating power of the electrical contact, and the abnormality can be found before the equipment is burnt due to the heating of the contact.
In the description of the present specification, a description referring to the terms "one embodiment," "further embodiment," "some specific embodiments," or "some examples," etc., means that a particular feature, structure, 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.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. An electrical contact temperature measurement circuit, comprising:
the voltage difference measuring module is used for obtaining the voltage difference of the upper side and the lower side of the electrical contact of the electric equipment;
the current measurement module is used for obtaining the loop current of the electric equipment;
the metering chip is respectively and electrically connected with the voltage difference measuring module and the current measuring module, and is used for obtaining the heating power of the electrical contact according to the voltage difference and the loop current;
and the main control module is electrically connected with the metering chip.
2. The electrical contact temperature measurement circuit of claim 1, wherein the voltage difference measurement module comprises:
the first voltage dividing unit comprises a plurality of first resistors which are connected in series and a plurality of second resistors which are connected in series, wherein a first end of each of the plurality of first resistors which are connected in series is electrically connected with the upper side of the A-phase electrical contact, a first end of each of the plurality of second resistors which are connected in series is electrically connected with the lower side of the A-phase electrical contact, a second end of each of the plurality of first resistors which are connected in series is electrically connected with the metering chip, a second end of each of the plurality of second resistors which are connected in series is electrically connected with the metering chip, and a plurality of third resistors which are connected in series are arranged between the second end of each of the plurality of first resistors which are connected in series and the second end of each of the plurality of second resistors which are connected in series;
the second voltage division unit comprises a plurality of fourth resistors which are mutually connected in series and a plurality of fifth resistors which are mutually connected in series, wherein the first ends of the fourth resistors which are mutually connected in series are electrically connected with the upper side of the B-phase electrical contact, the first ends of the fifth resistors which are mutually connected in series are electrically connected with the lower side of the B-phase electrical contact, the second ends of the fourth resistors which are mutually connected in series are electrically connected with the metering chip, the second ends of the fifth resistors which are mutually connected in series are electrically connected with the metering chip, and a plurality of sixth resistors which are mutually connected in series are arranged between the second ends of the fourth resistors which are mutually connected in series and the second ends of the second resistors which are mutually connected in series;
the third voltage dividing unit comprises a plurality of seventh resistors which are mutually connected in series and a plurality of eighth resistors which are mutually connected in series, wherein the first ends of the seventh resistors which are mutually connected in series are electrically connected with the upper side of the C-phase electrical contact, the first ends of the eighth resistors which are mutually connected in series are electrically connected with the lower side of the C-phase electrical contact, the second ends of the seventh resistors which are mutually connected in series are electrically connected with the metering chip, the second ends of the eighth resistors which are mutually connected in series are electrically connected with the metering chip, and a plurality of ninth resistors which are mutually connected in series are arranged between the second ends of the seventh resistors which are mutually connected in series and the second ends of the eighth resistors which are mutually connected in series.
3. The electrical contact temperature measurement circuit of claim 2, wherein the second ends of the plurality of first resistors connected in series are further grounded through a first capacitor, and the second ends of the plurality of second resistors connected in series are further grounded through a second capacitor; the second ends of the fourth resistors which are connected in series are grounded through a third capacitor, and the second ends of the fifth resistors which are connected in series are grounded through a fourth capacitor; the second ends of the seventh resistors which are connected in series are grounded through a fifth capacitor, and the second ends of the eighth resistors which are connected in series are grounded through a sixth capacitor.
4. The electrical contact temperature measurement circuit of claim 1, wherein the current measurement module comprises a current transformer.
5. The electrical contact temperature measurement circuit of claim 1, further comprising a power module for providing operating power to the metering chip and the master control module.
6. The electrical contact temperature measurement circuit of claim 5, wherein the power module comprises a first voltage conversion unit for converting ac mains to 9V and 5V and a second voltage conversion unit for converting 9V to 3.3V.
7. The electrical contact temperature measurement circuit of claim 1, wherein the metering chip is further coupled to a crystal oscillator.
8. The electrical contact temperature measurement circuit of claim 1, further comprising an alarm module electrically connected to the main control module.
9. The electrical contact temperature measurement circuit of claim 8, wherein the alarm module comprises an indicator light or a buzzer.
10. An electrical contact temperature measurement device comprising an electrical contact temperature measurement circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321489161.2U CN220289728U (en) | 2023-06-12 | 2023-06-12 | Electrical contact temperature measuring circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321489161.2U CN220289728U (en) | 2023-06-12 | 2023-06-12 | Electrical contact temperature measuring circuit and device |
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| Publication Number | Publication Date |
|---|---|
| CN220289728U true CN220289728U (en) | 2024-01-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321489161.2U Active CN220289728U (en) | 2023-06-12 | 2023-06-12 | Electrical contact temperature measuring circuit and device |
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|---|---|
| CN (1) | CN220289728U (en) |
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2023
- 2023-06-12 CN CN202321489161.2U patent/CN220289728U/en active Active
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