CN212255635U - Equipment ground wire monitoring device - Google Patents
Equipment ground wire monitoring device Download PDFInfo
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- CN212255635U CN212255635U CN201922243704.2U CN201922243704U CN212255635U CN 212255635 U CN212255635 U CN 212255635U CN 201922243704 U CN201922243704 U CN 201922243704U CN 212255635 U CN212255635 U CN 212255635U
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Abstract
The utility model discloses a device ground wire monitoring device, which comprises a power circuit, a constant current source circuit, a ground wire impedance sampling circuit, a comparison circuit, an indicator light display circuit and a buzzer circuit; the power supply circuit is used for supplying power to the constant current source circuit and the ground wire impedance sampling circuit; the constant current source circuit is used for supplying power to the ground wire of the monitored equipment; the ground wire impedance sampling circuit is used for collecting the voltage at two ends of the ground wire of the monitored equipment; the comparison circuit is connected with the indicator light display circuit and used for comparing the acquired voltage at two ends of the ground wire of the monitored equipment with a preset voltage and outputting a high level or a low level according to a comparison result; and the indicator lamp display circuit is used for receiving the high level or the low level output by the comparison circuit and controlling the indicator lamp to display different colors according to different received levels. The utility model provides the high security of device has avoided because of the emergence of the good incident that arouses of ground wire not connected.
Description
Technical Field
The utility model relates to an electrical equipment protection circuit field, the more specifically equipment ground wire monitoring devices that says so.
Background
Along with the progress of the times, electronic equipment is more and more widely applied, particularly on a production line, semi-automation and automation are more and more applied, the production efficiency is higher and higher, but the production efficiency is not the first element of the production line, the first element of the production line is safety, the production efficiency is generated only on the premise of ensuring the safety of the production line, otherwise once a safety accident occurs, the production is seriously changed into a dark one, in the production line, one of the elements is ensured to be grounded so as to ensure the safety, and the personal safety of the equipment with a metal shell is prevented from being endangered due to the fact that the equipment is electrified due to insulation damage.
The existing detection equipment is used for measuring the grounding by using the on-off gear of a multimeter to judge whether the equipment is well grounded, but the method has the following problems: before the device is used, a universal meter is used for measuring whether the earth is grounded or not, but the device is easy to forget to measure due to negligence or lucky psychology; or the ground wire is well connected during measurement and falls off during production; or poor contact caused by aging of the ground wire, etc., therefore, the measurement method has a leak, which may cause a significant safety hazard to the production line.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide an equipment ground wire monitoring devices.
In order to achieve the above purpose, the utility model adopts the following technical scheme: an equipment ground wire monitoring device comprises a power supply circuit, a constant current source circuit, a ground wire impedance sampling circuit, a comparison circuit and an indicator light display circuit;
the power supply circuit is connected with the constant current source circuit and the ground wire impedance sampling circuit and is used for supplying power to the constant current source circuit and the ground wire impedance sampling circuit;
the constant current source circuit is connected with the ground wire impedance sampling circuit and used for supplying power to the ground wire of the monitored equipment;
the ground wire impedance sampling circuit is connected with the ground wire of the monitored equipment and the comparison circuit and is used for collecting the voltage at two ends of the ground wire of the monitored equipment;
the comparison circuit is connected with the indicator light display circuit and used for comparing the acquired voltage at two ends of the ground wire of the monitored equipment with a preset voltage and outputting a high level or a low level according to a comparison result;
and the indicator lamp display circuit is used for receiving the high level or the low level output by the comparison circuit and controlling the indicator lamp to display different colors according to the received different levels.
The further technical scheme is as follows: the device also comprises a buzzer circuit; the buzzer circuit is connected with the comparison circuit and used for receiving the high level or the low level output by the comparison circuit and controlling the buzzer to give out or not give out alarm sound according to the received different levels.
The further technical scheme is as follows: the power supply circuit comprises a DCDC converter U1 and a low dropout linear regulator U2 connected with the DCDC converter U1; the DCDC converter U1 is configured to perform dc boosting on a dc voltage provided by an external power supply, and the low dropout regulator U2 is configured to perform dc stepping down on a dc boosted voltage of the DCDC converter U1.
The further technical scheme is as follows: the constant current source circuit comprises a controllable voltage-stabilizing source U3, an operational amplifier U4A and an MOS tube Q1 which are connected in sequence; the controllable voltage-stabilizing source U3 is used for outputting reference voltage, and the operational amplifier U4A and the MOS tube Q1 form a constant current source to output current for a ground wire of monitored equipment.
The further technical scheme is as follows: the ground wire impedance sampling circuit comprises an anti-reverse diode D1, an operational amplifier U5A, an operational amplifier U5B and an operational amplifier U6A; the anode of the anti-reverse diode D1 is connected with a MOS tube Q1, the cathode of the anti-reverse diode D1 is connected with the non-inverting input end of an operational amplifier U5B through a resistor R12, the inverting input end of the operational amplifier U5B is connected with the inverting input end of the operational amplifier U5A through a resistor R18, and the output end of the transport amplifier U5B is connected with the non-inverting input end of an operational amplifier U6A through a resistor R21; the non-inverting input end of the operational amplifier U5A is connected with the cathode of an anti-inverting diode D1 through a capacitor C16, and the output end of the operational amplifier U5A is connected with the inverting input end of an operational amplifier U6A through a resistor R10.
The further technical scheme is as follows: the comparison circuit comprises a rheostat RV1 and a comparator U6B; a first pin of the rheostat RV1 is connected with an output end of the transport amplifier U5B and a non-inverting input end of the operational amplifier U6A respectively, and a second pin of the rheostat RV1 is connected with an inverting input end of the comparator U6B; the non-inverting input terminal of the comparator U6B is connected with the output terminal of the operational amplifier U6A through a resistor R16.
The further technical scheme is as follows: the indicator lamp display circuit comprises an optocoupler U7, a triode Q4, a triode Q5 and a triode Q6; a first pin of the optocoupler U7 is connected with an output end of the comparator U6B, and a third pin of the optocoupler U7 is connected with a base electrode of a triode Q5 through a resistor R27 and a base electrode of a triode Q4 through a resistor R28 respectively; the emitter of the triode Q5 is grounded, and the collector of the triode Q5 is connected with the base of the triode Q6; the emitter of the triode Q4 is grounded, and the collector of the triode Q4 is connected with the third pin of the indicator light through a resistor R31; the collector of the transistor Q6 is connected with the second pin of the indicator light through a resistor R32, and the emitter of the transistor Q6 is grounded.
The further technical scheme is as follows: the buzzer circuit comprises a toggle switch K1 and a timing chip U8; a first pin of the toggle switch K1 is connected with a fourth pin of the optocoupler U7, and a second pin of the toggle switch K1 is connected with an eighth pin of the timing chip U8; the output end of the timing chip U8 is connected with a buzzer.
Compared with the prior art, the utility model beneficial effect be: the utility model provides a pair of equipment ground wire monitoring devices, be the ground wire power supply by monitoring equipment through constant current source circuit, rethread ground wire impedance sampling circuit measures the voltage at the ground wire both ends by monitoring equipment, when the voltage at ground wire both ends is greater than preset voltage, equipment ground wire monitoring devices's pilot lamp can show the red light and send the chimes of doom through the honey ware, thereby can carry out real-time monitoring to the ground wire connection condition by monitoring equipment, the security of device has been improved, the emergence of the incident that arouses because of the ground wire is not connected has been avoided.
The foregoing is a summary of the present invention, and other objects, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments, which is provided for the purpose of illustration and understanding of the present invention.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of an apparatus ground wire monitoring device according to the present invention;
fig. 2 is a schematic circuit diagram of a specific embodiment of an apparatus ground wire monitoring device of the present invention.
Reference numerals
10. A power supply circuit; 20. a constant current source circuit; 30. a ground impedance sampling circuit; 40. a comparison circuit; 50. an indicator light display circuit; 60. a buzzer circuit.
Detailed Description
In order to more fully understand the technical content of the present invention, the technical solution of the present invention will be further described and illustrated with reference to the following specific embodiments, but not limited thereto.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "secured" are to be construed broadly and can, for example, be connected or detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. 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 disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., 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 invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by one skilled in the art.
The utility model provides a device ground wire monitoring device, please refer to fig. 1 and 2, the device comprises a power circuit 10, a constant current source circuit 20, a ground wire impedance sampling circuit 30, a comparison circuit 40 and an indicator light display circuit 50; a power supply circuit 10 connected to the constant current source circuit 20 and the ground impedance sampling circuit 30 for supplying power to the constant current source circuit 20 and the ground impedance sampling circuit 30; a constant current source circuit 20 connected to the ground impedance sampling circuit 30 for supplying power to the ground of the monitored device; the ground wire impedance sampling circuit 30 is connected with the ground wire of the monitored equipment and the comparison circuit 40 and is used for collecting the voltage at two ends of the ground wire of the monitored equipment; the comparison circuit 40 is connected with the indicator light display circuit 50 and is used for comparing the acquired voltage at two ends of the ground wire of the monitored equipment with a preset voltage and outputting a high level or a low level according to the comparison result; and the indicator lamp display circuit 50 is used for receiving the high level or the low level output by the comparison circuit 40 and controlling the indicator lamp to display different colors according to the received different levels.
In some embodiments, the device ground monitoring apparatus further comprises a buzzer circuit 60; the buzzer circuit 60 is connected to the comparison circuit 40, and is configured to receive the high level or the low level output by the comparison circuit 40, and control the buzzer to sound or not to sound an alarm according to the received different levels.
The device ground wire monitoring device is used for monitoring whether the ground wire of the device is connected with the ground well or not, and the principle of the device ground wire monitoring device is that the impedance of the device ground wire is measured by providing a constant current source for the ground wire of the device to be monitored, and then the impedance is compared with a preset impedance value, when the impedance value of the device ground wire is larger than the preset impedance value, the device is not connected with the ground well, the device ground wire monitoring device can give an alarm, the preset impedance value can be set, the range of the device ground wire monitoring device can be set to be 0.0-80.0 omega, the ground resistance of general devices is not more than 4.0 omega, and the impedance monitoring of all the device ground wires in the current stage is completely met.
Further, as shown in fig. 2, the power circuit 10 includes a DCDC converter U1, and a low dropout regulator U2 connected to the DCDC converter U1; the DCDC converter U1 is configured to perform dc boosting on a dc voltage provided by an external power supply, and the low dropout regulator U2 is configured to perform dc boosting on a dc voltage of the DCDC converter U1. In this embodiment, the model of the DCDC converter U1 is B0509XT-1WR3, and the model of the low dropout regulator U2 is AMS 1117-5.0. In fig. 2, SYS _5V is supplied from the outside, 5V from the device itself enters the single board from J3, is converted into 9V by the DCDC converter U1, and is converted into 5V (ISO _5V) by the low dropout linear regulator (LDO) U2 in fig. 2 to supply power to the constant current source motor and the ground impedance sampling circuit 30.
Further, as shown in fig. 2, the constant current source circuit 20 includes a controllable voltage regulator U3, an operational amplifier U4A, and a MOS transistor Q1, which are connected in sequence; the controllable voltage-stabilizing source U3 is used for outputting reference voltage, and the operational amplifier U4A and the MOS tube Q1 form a constant current source to output current for the ground wire of the monitored equipment. In this embodiment, the model of the controllable voltage-stabilizing source U3 is TL431ACDBZR, the model of the operational amplifier U4A is LMC6482, and the model of the MOS transistor Q1 is WNM 3003-3/TR. In fig. 2, 2.5V provided by a controllable voltage regulator U3 is used as a reference voltage, an operational amplifier U4A and a MOS transistor Q1 form a constant current source, the output current is 10mA, and the constant current source supplies power to a ground wire of a monitored device.
Further, as shown in fig. 2, the ground impedance sampling circuit 30 includes an anti-reverse diode D1, an operational amplifier U5A, an operational amplifier U5B, and an operational amplifier U6A; the anode of the anti-reflection diode D1 is connected with the MOS tube Q1, the cathode of the anti-reflection diode D1 is connected with the non-inverting input end of the operational amplifier U5B through a resistor R12, the inverting input end of the operational amplifier U5B is connected with the inverting input end of the operational amplifier U5A through a resistor R18, and the output end of the transport amplifier U5B is connected with the non-inverting input end of the operational amplifier U6A through a resistor R21; the non-inverting input terminal of the operational amplifier U5A is connected to the cathode of the anti-inverting diode D1 through a capacitor C16, and the output terminal of the operational amplifier U5A is connected to the inverting input terminal of the operational amplifier U6A through a resistor R10. The comparison circuit 40 comprises a rheostat RV1 and a comparator U6B; a first pin of the rheostat RV1 is connected with the output end of the transport amplifier U5B and the non-inverting input end of the operational amplifier U6A respectively, and a second pin of the rheostat RV1 is connected with the inverting input end of the comparator U6B; the non-inverting input of the comparator U6B is connected to the output of the operational amplifier U6A through a resistor R16. In this embodiment, the operational amplifiers U5A, U5B, U6A, and U6B are all model LMC 6482. In fig. 2, two ports of J2 are used for connecting the ground wire of the monitored device, a 10mA constant current source is formed by an anti-reverse diode D1 passing through J2 (the ground wire of the monitored device) and then passing through a resistor R4, a loop is formed, current flows through the ground wire of the device to generate a voltage difference, the design is that a 2-time instrument amplifier composed of three operational amplifiers (i.e. operational amplifiers U5A, U5B and U6A) is used for collecting the voltage at two ends of the ground wire of the device, and then the voltage is compared with a voltage adjustable by a rheostat RV 1. When the impedance across the ground is higher than the preset value, the comparator U6B outputs a high level.
Further, as shown in fig. 2, the indicator light display circuit 50 includes an optocoupler U7, a transistor Q4, a transistor Q5, and a transistor Q6; a first pin of the optocoupler U7 is connected with an output end of a comparator U6B, and a third pin of the optocoupler U7 is connected with a base electrode of a triode Q5 through a resistor R27 and a base electrode of a triode Q4 through a resistor R28 respectively; the emitter of the triode Q5 is grounded, and the collector of the triode Q5 is connected with the base of the triode Q6; the emitter of the triode Q4 is grounded, and the collector of the triode Q4 is connected with the third pin of the indicator light through the resistor R31; the collector of the transistor Q6 is connected to the second pin of the indicator light through a resistor R32, and the emitter of the transistor Q6 is grounded. The buzzer circuit 60 comprises a toggle switch K1 and a timing chip U8; a first pin of the toggle switch K1 is connected with a fourth pin of the optocoupler U7, and a second pin of the toggle switch K1 is connected with an eighth pin of the timing chip U8; the output end of the timing chip U8 is connected with the buzzer. In this embodiment, the optocoupler U7 is of the type K10104C, the triodes Q4, Q5 and the triode Q6 are of the type MMBT2222, and the toggle switch K1 is of the type MMBT2222
The model number of the SK12F14G7 is NE555D, and the model number of the timing chip U8 is NE 555D. In fig. 2, a comparison voltage output by the comparison circuit 40 passes through the optocoupler U7, and when the impedance of the ground wire of the monitored device is greater than a preset value, the indicator light D2 lights the red light, the buzzer sounds a beep … … alarm, and the beep alarm can be turned off by the fluctuation switch K1; the indicator light is driven by a triode, the buzzer is a direct current buzzer, and NE555 is adopted to output a square wave with the frequency of about 2Hz for control.
In addition, according to the requirement of the preset voltage, the rheostat RV1 can be adjusted, and the adjustment process is as follows:
the large 4Pin socket (J1) is connected with a 5V power supply, and the power supply current is more than 150 mA;
the fence type wiring terminal (J2) is connected with a standard resistance value which is the limit value (0-80 omega) of the ground wire impedance of the monitored equipment; the rheostat RV1 is adjusted by observing the indicator lamp D2, and the EGFM-power-on indicator lamp D2 has two conditions: if the green light is turned on, the rheostat RV1 is adjusted anticlockwise until the indicator light just turns on the red light, which indicates that the adjustment is good; when the indicator light is turned on in red, the rheostat RV1 is adjusted clockwise until the indicator light is turned on in green, and then the rheostat RV1 is adjusted anticlockwise until the indicator light is just turned on in red, which indicates that the adjustment is good.
The device can monitor the equipment ground wires within the range of 0.0-80.0 omega, the precision of the device can be debugged to +/-0.5%, the equipment ground wires can be tested as long as any poor connection occurs on the monitored equipment ground wires, an alarm is given out, the connection of the equipment ground wires is guaranteed to be all-round, and the potential safety hazard caused by poor connection of the ground wires of production line equipment is perfectly solved.
The technical content of the present invention is further described by the embodiments only, so that the reader can understand it more easily, but the embodiments of the present invention are not limited thereto, and any technical extension or re-creation according to the present invention is protected by the present invention. The protection scope of the present invention is subject to the claims.
Claims (8)
1. The device ground wire monitoring device is characterized by comprising a power supply circuit, a constant current source circuit, a ground wire impedance sampling circuit, a comparison circuit and an indicator light display circuit;
the power supply circuit is connected with the constant current source circuit and the ground wire impedance sampling circuit and is used for supplying power to the constant current source circuit and the ground wire impedance sampling circuit;
the constant current source circuit is connected with the ground wire impedance sampling circuit and used for supplying power to the ground wire of the monitored equipment;
the ground wire impedance sampling circuit is connected with the ground wire of the monitored equipment and the comparison circuit and is used for collecting the voltage at two ends of the ground wire of the monitored equipment;
the comparison circuit is connected with the indicator light display circuit and used for comparing the acquired voltage at two ends of the ground wire of the monitored equipment with a preset voltage and outputting a high level or a low level according to a comparison result;
and the indicator lamp display circuit is used for receiving the high level or the low level output by the comparison circuit and controlling the indicator lamp to display different colors according to the received different levels.
2. The device ground monitoring apparatus of claim 1, further comprising a buzzer circuit; the buzzer circuit is connected with the comparison circuit and used for receiving the high level or the low level output by the comparison circuit and controlling the buzzer to give out or not give out alarm sound according to the received different levels.
3. The device ground monitoring device of claim 1, wherein the power circuit comprises a DCDC converter U1, and a low dropout regulator U2 connected to the DCDC converter U1; the DCDC converter U1 is configured to perform dc boosting on a dc voltage provided by an external power supply, and the low dropout regulator U2 is configured to perform dc stepping down on a dc boosted voltage of the DCDC converter U1.
4. The device ground wire monitoring device according to claim 2, wherein the constant current source circuit comprises a controllable voltage regulator U3, an operational amplifier U4A and a MOS transistor Q1 which are connected in sequence; the controllable voltage-stabilizing source U3 is used for outputting reference voltage, and the operational amplifier U4A and the MOS tube Q1 form a constant current source to output current for a ground wire of monitored equipment.
5. The device ground monitoring device according to claim 4, wherein the ground impedance sampling circuit comprises an anti-reverse diode D1, an operational amplifier U5A, an operational amplifier U5B, an operational amplifier U6A; the anode of the anti-reverse diode D1 is connected with a MOS tube Q1, the cathode of the anti-reverse diode D1 is connected with the non-inverting input end of an operational amplifier U5B through a resistor R12, the inverting input end of the operational amplifier U5B is connected with the inverting input end of the operational amplifier U5A through a resistor R18, and the output end of the transport amplifier U5B is connected with the non-inverting input end of an operational amplifier U6A through a resistor R21; the non-inverting input end of the operational amplifier U5A is connected with the cathode of an anti-inverting diode D1 through a capacitor C16, and the output end of the operational amplifier U5A is connected with the inverting input end of an operational amplifier U6A through a resistor R10.
6. The device ground wire monitoring device of claim 5, wherein the comparison circuit comprises a rheostat RV1 and a comparator U6B; a first pin of the rheostat RV1 is connected with an output end of the transport amplifier U5B and a non-inverting input end of the operational amplifier U6A respectively, and a second pin of the rheostat RV1 is connected with an inverting input end of the comparator U6B; the non-inverting input terminal of the comparator U6B is connected with the output terminal of the operational amplifier U6A through a resistor R16.
7. The equipment ground wire monitoring device of claim 6, wherein the indicator light display circuit comprises an optocoupler U7, a transistor Q4, a transistor Q5 and a transistor Q6; a first pin of the optocoupler U7 is connected with an output end of the comparator U6B, and a third pin of the optocoupler U7 is connected with a base electrode of a triode Q5 through a resistor R27 and a base electrode of a triode Q4 through a resistor R28 respectively; the emitter of the triode Q5 is grounded, and the collector of the triode Q5 is connected with the base of the triode Q6; the emitter of the triode Q4 is grounded, and the collector of the triode Q4 is connected with the third pin of the indicator light through a resistor R31; the collector of the transistor Q6 is connected with the second pin of the indicator light through a resistor R32, and the emitter of the transistor Q6 is grounded.
8. The device ground wire monitoring device of claim 7, wherein the buzzer circuit comprises a toggle switch K1 and a timing chip U8; a first pin of the toggle switch K1 is connected with a fourth pin of the optocoupler U7, and a second pin of the toggle switch K1 is connected with an eighth pin of the timing chip U8; the output end of the timing chip U8 is connected with a buzzer.
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| CN201922243704.2U CN212255635U (en) | 2019-12-13 | 2019-12-13 | Equipment ground wire monitoring device |
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| CN201922243704.2U CN212255635U (en) | 2019-12-13 | 2019-12-13 | Equipment ground wire monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113030834A (en) * | 2021-04-19 | 2021-06-25 | 北京送变电有限公司 | Transformer secondary circuit line calibration device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113030834A (en) * | 2021-04-19 | 2021-06-25 | 北京送变电有限公司 | Transformer secondary circuit line calibration device and method |
| CN113030834B (en) * | 2021-04-19 | 2023-01-10 | 北京送变电有限公司 | Transformer secondary circuit line calibration device and method |
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