CN211085509U - Temperature detection circuit of zero line or live wire - Google Patents
Temperature detection circuit of zero line or live wire Download PDFInfo
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- CN211085509U CN211085509U CN201921475942.XU CN201921475942U CN211085509U CN 211085509 U CN211085509 U CN 211085509U CN 201921475942 U CN201921475942 U CN 201921475942U CN 211085509 U CN211085509 U CN 211085509U
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Abstract
The utility model provides a zero line or live wire temperature detection circuit, a temperature sampling circuit is used for sampling the temperature of a zero line or a live wire and outputting the sampling temperature of the zero line or the live wire; the input end of the temperature comparison circuit is connected with the output end of the temperature sampling circuit and is used for comparing the sampling temperature with the reference temperature and outputting a temperature comparison result; the input end of the differential circuit is connected with the output end of the temperature sampling circuit and is used for calculating the slope of the sampling temperature and outputting the slope of the sampling temperature; the input end of the slope comparison circuit is connected with the output end of the differential circuit and is used for comparing the slope of the sampling temperature with a preset slope and outputting a slope comparison result; the input end of the relay control circuit is connected with the output end of the temperature comparison circuit and the output end of the slope comparison circuit and used for controlling the on-off of the relay connected with the zero line or the live line according to the temperature comparison result and the slope comparison result. The utility model provides high temperature detection's accuracy.
Description
Technical Field
The utility model relates to a temperature detect technical field particularly, mainly relates to a temperature detect circuit of zero line or live wire.
Background
In the use process of a product, in order to ensure the normal operation of the product or realize certain functions, a practical temperature detection circuit is required to detect the temperature of the current environment or a certain device. The existing temperature detection usually only detects temperature, and does not detect the temperature slope. Therefore, in the actual use process, a situation often exists that the current sampling temperature does not exceed the temperature threshold, but exceeds the temperature threshold at the next moment, and the situation damages the product or the component greatly.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect, provide a temperature detection circuit based on live wire or zero line, through sampling to the temperature of live wire or zero line to calculate sampling temperature's slope, confirm whether break off the circuit that live wire or zero line were located jointly according to sampling temperature and slope.
The embodiment of the utility model provides a temperature detection circuit of a live wire or a zero wire, which comprises a temperature sampling circuit, a differential circuit, a temperature comparison circuit, a slope comparison circuit and a relay control circuit, wherein,
the temperature sampling circuit is used for sampling the temperature of the zero line or the live line and outputting the sampling temperature of the zero line or the live line;
the input end of the temperature comparison circuit is connected with the output end of the temperature sampling circuit and is used for comparing the sampling temperature with a reference temperature and outputting a temperature comparison result;
the input end of the differential circuit is connected with the output end of the temperature sampling circuit and is used for calculating the slope of the sampling temperature and outputting the slope of the sampling temperature;
the input end of the comparison circuit is connected with the output end of the differential circuit and is used for comparing the slope of the sampling temperature with a preset slope and outputting a slope comparison result;
the input end of the relay control circuit is connected with the output end of the temperature comparison circuit and the output end of the slope comparison circuit and used for controlling the on-off of the relay of the zero line or the live line according to the temperature comparison result and the slope comparison result.
The utility model has the advantages that: the utility model discloses a zero line or live wire temperature detect circuit, including temperature sampling circuit, differential circuit, temperature comparison circuit, slope comparison circuit and relay control circuit, judge through the rate of change that combines the temperature, avoided not exceeding the threshold value at temperature detection, and because the temperature rate of change leads to the temperature to exceed the condition of threshold value rapidly too soon, the utility model discloses a detection circuitry has improved temperature detection's accuracy.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention.
Fig. 1 is a schematic circuit structure diagram of a zero line or live line temperature detection circuit provided in an embodiment of the present invention;
fig. 2 is a circuit diagram of a zero line or live wire temperature detection circuit provided by an embodiment of the present invention.
Detailed Description
Hereinafter, various embodiments of the present invention will be described more fully. The present invention is capable of various embodiments, and modifications and variations are possible therein. However, it should be understood that: there is no intention to limit the various embodiments of the invention to the specific embodiments disclosed herein, but on the contrary, the intention is to cover all modifications, equivalents, and/or alternatives falling within the spirit and scope of the various embodiments of the invention.
Hereinafter, the term "includes" or "may include" used in various embodiments of the present invention indicates the existence of the disclosed functions, operations or elements, and does not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "has," "having" and their derivatives are intended to be inclusive and mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are intended only to specify the presence of, or addition to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be interpreted as excluding the first possibility of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the present invention, the expression "a or/and B" includes any or all combinations of the words listed simultaneously, e.g. may include a, may include B or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: in the present invention, unless otherwise explicitly specified or defined, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; there may be communication between the interiors of the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present invention, it should be understood by those skilled in the art that the terms indicating orientation or positional relationship herein are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The terminology used in the various embodiments of the present invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the present invention. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The embodiment of the utility model provides a live wire or zero line temperature detection circuit, as shown in fig. 1, this detection circuit 100 includes temperature sampling circuit 1, temperature comparison circuit 2, differential circuit 3, slope comparison circuit 4 and relay control circuit 5, wherein, temperature sampling circuit 1 is used for sampling the temperature of zero line or live wire, exports the sampling temperature of zero line or live wire; the input end of the temperature comparison circuit 2 is connected with the output end of the temperature sampling circuit and is used for comparing the sampling temperature with a reference temperature and outputting a temperature comparison result; the input end of the differential circuit 3 is connected with the output end of the temperature sampling circuit 1, and is used for performing slope calculation on the sampling temperature and outputting the slope of the sampling temperature; the input end of the slope comparison circuit 4 is connected with the output end of the differential circuit 3, and is used for comparing the slope of the sampling temperature with a preset slope and outputting a slope comparison result; the input end of the relay control circuit 5 is connected with the output end of the temperature comparison circuit 2 and the output end of the slope comparison circuit 4, and is used for controlling the on-off of a relay connected with the zero line or the live line according to the temperature comparison result and the slope comparison result.
As shown in fig. 2, the temperature sampling circuit 1 includes a thermistor RT1, a first resistor R1, and a first capacitor C1, wherein one end of the first resistor R1 is connected to a first power voltage terminal VDD3V3, the other end of the first resistor R1 is connected to ground through the thermistor RT1, the other end of the first resistor R1 is further connected to ground through the first capacitor C1, and the other end of the first resistor R1 is connected to the input terminal of the differential circuit 3 and the input terminal of the temperature comparison circuit 2.
Further, the temperature sampling circuit 1 further includes a second resistor R2 and a radio frequency follower U1, wherein the other end of the first resistor R1 is further connected to the negative electrode of the radio frequency follower U1 through the second resistor R2, the positive electrode of the radio frequency follower U1 is connected to the output end of the radio frequency follower U1, and the output end of the radio frequency follower U1 is further connected to the input end of the differentiating circuit 3 and the input end of the temperature comparing circuit 2.
As shown in fig. 2, the temperature comparison circuit 2 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a first amplifier U2, wherein the positive terminal of the first amplifier U2 is connected to the first power supply voltage terminal VDD3V3 via the third resistor R3, the positive terminal of the first amplifier U2 is further connected to ground via the fourth resistor R4, the negative terminal of the first amplifier U2 is connected to the output terminal of the temperature sampling circuit 1 via the fifth resistor R5, and the output terminal of the first amplifier U2 is connected to the input terminal of the relay control circuit 5.
Further, the detection circuit further includes a sixth resistor R6 and a first diode D1, wherein the output terminal of the first amplifier U2 is further connected to the second power voltage terminal 12V _ DCIN through the sixth resistor R6, the output terminal of the first amplifier U2 is further connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the input terminal of the relay control circuit 5.
By comparing the sampled temperature with the set temperature threshold, the temperature detection result can be obtained from the temperature perspective.
Further, as shown in fig. 2, the differentiating circuit includes a second capacitor C2, a seventh resistor R7, and a second amplifier U3, wherein an output terminal of the radio frequency follower U1 is connected to a negative input terminal of a second amplifier U3 through the second capacitor C2, a positive input terminal of the second amplifier U3 is connected to ground, and a negative input terminal of the second amplifier U3 is further connected to an output terminal of the second amplifier U3 through the seventh resistor R7.
For example, assuming that the output voltage of the temperature sampling circuit is Vi, after passing through the differentiating circuit, the output voltage Vo of the differentiating circuit is-R7 × C2 dVi/dt, and when the temperature increases, Vi decreases, dVi/dt is negative, and Vo is positive, that is, the slope of the temperature increase is detected.
As shown in fig. 2, the slope comparing circuit 4 further includes an eighth resistor R8, a ninth resistor R9, and a third amplifier U4, wherein a positive terminal of the third amplifier U4 is connected to ground through the eighth resistor R8, a positive terminal of the third amplifier U4 is connected to the first power supply voltage terminal VDD3V3 through the ninth resistor R9, a negative input terminal of the third amplifier U4 is connected to an output terminal of the differentiating circuit 3, and an output terminal of the third amplifier U4 is connected to an input terminal of the relay control circuit 5.
By comparing the slope of the sampling temperature with the set slope, the comparison result of the slopes can be obtained.
As shown in fig. 2, further, the relay control circuit includes a tenth resistor R10, a second diode D2, a first transistor Q1, a first MOS transistor Q2, wherein the output terminal of the slope comparing circuit 4 is connected to the second power voltage terminal 12V _ DCIN through the tenth resistor R10, the output end of the slope comparison circuit 4 is connected with the anode of the second diode Q2, the output end of the voltage comparison circuit 2 is connected with the cathode of the second diode D2, the cathode of the second diode D2 is also connected to the base of the first transistor Q1, the emitter of the first transistor Q1 is connected to ground, the collector of the first triode Q1 is connected with the gate of the first MOS transistor Q2, the source of the first MOS transistor Q2 is the output terminal 12V _ RT of the detection circuit, the drain of the first MOS transistor Q2 is connected to the second power voltage terminal 12V _ DCIN.
Further, the detection circuit further includes a third diode D3 and a fourth diode D4, wherein the gate of the first MOS transistor Q2 is connected to the anode of the third diode D3, the cathode of the third diode D3 is connected to the cathode of the fourth diode D4, and the anode of the fourth diode D4 is connected to the drain of the first MOS transistor Q2.
Further, the detection circuit further comprises a third capacitor C3, wherein the source of the first MOS transistor Q2 is further connected to ground through the third capacitor C3.
For example, the working principle of the detection circuit is illustrated, if the threshold temperature of the relay disconnection of the live wire or the zero wire is 85 degrees, if the temperature reference value is set to 70 degrees, the slope reference value is set to 10 degrees/s; when the current sampling temperature is greater than 70 degrees and the slope of the change of the sampling temperature is greater than the reference slope, the output voltage of the detection circuit is controlled to enable the relay of the zero line or the live line to be controlled to be disconnected, otherwise, the output voltage enables the relay of the zero line or the live line to be closed, and therefore the circuit is protected.
The utility model discloses a zero line or live wire temperature detect circuit, including temperature sampling circuit, differential circuit, temperature comparison circuit, slope comparison circuit and relay control circuit, judge through the rate of change that combines the temperature, avoided not exceeding the threshold value at temperature detection, and because the temperature rate of change leads to the temperature to exceed the condition of threshold value rapidly too soon, the utility model discloses a detection circuitry has improved temperature detection's accuracy.
The embodiments described above represent only a few embodiments of the present invention, which are described in detail and specific, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, other various changes and modifications can be made according to the above-described technical solutions and concepts, and all such changes and modifications should fall within the protection scope of the present invention.
Claims (10)
1. A zero line or live line temperature detection circuit is characterized by comprising a temperature sampling circuit, a differential circuit, a temperature comparison circuit, a slope comparison circuit and a relay control circuit, wherein,
the temperature sampling circuit is used for sampling the temperature of the zero line or the live line and outputting the sampling temperature of the zero line or the live line;
the input end of the temperature comparison circuit is connected with the output end of the temperature sampling circuit and is used for comparing the sampling temperature with a reference temperature and outputting a temperature comparison result;
the input end of the differential circuit is connected with the output end of the temperature sampling circuit and is used for calculating the slope of the sampling temperature and outputting the slope of the sampling temperature;
the input end of the slope comparison circuit is connected with the output end of the differential circuit and is used for comparing the slope of the sampling temperature with a preset slope and outputting a slope comparison result;
the input end of the relay control circuit is connected with the output end of the temperature comparison circuit and the output end of the slope comparison circuit and used for controlling the on-off of a relay connected with the zero line or the live line according to the temperature comparison result and the slope comparison result.
2. The detection circuit of claim 1, wherein the temperature sampling circuit comprises a thermistor, a first resistor, and a first capacitor, wherein,
one end of the first resistor is connected with a first power supply voltage end, the other end of the first resistor is connected with the ground through the thermistor, the other end of the first resistor is further connected with the ground through the first capacitor, and the other end of the first resistor is connected with the input end of the differential circuit and the input end of the temperature comparison circuit.
3. The detection circuit of claim 2, wherein the temperature sampling circuit further comprises a second resistor and a radio frequency follower, wherein,
the other end of the first resistor is connected with the negative electrode of the radio frequency follower through the second resistor, the positive electrode of the radio frequency follower is connected with the output end of the radio frequency follower, and the output end of the radio frequency follower is connected with the input end of the differential circuit and the input end of the temperature comparison circuit.
4. The detection circuit of claim 3, wherein the temperature comparison circuit comprises a third resistor, a fourth resistor, a fifth resistor, and a first amplifier, wherein,
the positive end of the first amplifier is connected with the first power supply voltage end through the third resistor, the positive end of the first amplifier is further connected with the ground through the fourth resistor, the negative end of the first amplifier is connected with the output end of the radio frequency follower through the fifth resistor, and the output end of the first amplifier is connected with the input end of the relay control circuit.
5. The detection circuit of claim 4, further comprising a sixth resistor and a first diode, wherein,
the output end of the first amplifier is further connected with the second power supply voltage end through the sixth resistor, the output end of the first amplifier is further connected with the anode of the first diode, and the cathode of the first diode is connected with the input end of the relay control circuit.
6. The detection circuit of claim 5, wherein the differentiating circuit comprises a second capacitor, a seventh resistor, and a second amplifier, wherein,
the output end of the radio frequency follower is connected with the negative end of the second amplifier through the second capacitor, the positive end of the second amplifier is connected with the ground, and the negative end of the second amplifier is further connected with the output end of the second amplifier through the seventh resistor.
7. The detection circuit of claim 6, wherein the slope comparison circuit comprises an eighth resistor, a ninth resistor, and a third amplifier, wherein,
the positive end of the third amplifier is connected with the ground through the eighth resistor, the positive end of the third amplifier is connected with the first power voltage end through the ninth resistor, the negative end of the third amplifier is connected with the output end of the differential circuit, and the output end of the third amplifier is connected with the input end of the relay control circuit.
8. The detection circuit of claim 7, wherein the relay control circuit comprises a tenth resistor, a second diode, a first triode, a first MOS transistor, wherein,
the output end of the slope comparison circuit is connected with a second power supply voltage end through the tenth resistor, the output end of the slope comparison circuit is further connected with the anode of the second diode, the output end of the temperature comparison circuit is connected with the cathode of the second diode, the cathode of the second diode is further connected with the base of the first triode, the emitter of the first triode is connected with the ground, the collector of the first triode is connected with the gate of the first MOS tube, the source of the first MOS tube is the output end of the detection circuit, and the drain of the first MOS tube is connected with the second power supply voltage end.
9. The detection circuit of claim 8, further comprising a third diode, a fourth diode, wherein,
the grid electrode of the first MOS tube is connected with the anode of the third diode, the cathode of the third diode is connected with the cathode of the fourth diode, and the anode of the fourth diode is connected with the drain electrode of the first MOS tube.
10. The detection circuit of claim 9, further comprising a third capacitance, wherein,
and the source electrode of the first MOS tube is also connected with the ground through the third capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921475942.XU CN211085509U (en) | 2019-09-06 | 2019-09-06 | Temperature detection circuit of zero line or live wire |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921475942.XU CN211085509U (en) | 2019-09-06 | 2019-09-06 | Temperature detection circuit of zero line or live wire |
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| CN211085509U true CN211085509U (en) | 2020-07-24 |
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| CN201921475942.XU Active CN211085509U (en) | 2019-09-06 | 2019-09-06 | Temperature detection circuit of zero line or live wire |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114069565A (en) * | 2021-11-22 | 2022-02-18 | 齐鲁工业大学 | Temperature protection device and method of battery management system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114069565A (en) * | 2021-11-22 | 2022-02-18 | 齐鲁工业大学 | Temperature protection device and method of battery management system |
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Effective date of registration: 20210519 Address after: 201613 301 Rong Le Dong Road, Songjiang District, Shanghai. Patentee after: Hengda hengchi New Energy Vehicle Research Institute (Shanghai) Co.,Ltd. Address before: 518000 Room 201, building A, No. 1, Qian Wan Road, Qianhai Shenzhen Hong Kong cooperation zone, Shenzhen, Guangdong (Shenzhen Qianhai business secretary Co., Ltd.) Patentee before: HENGDA SMART CHARGING TECHNOLOGY Co.,Ltd. |