CN210142897U - Water meter bus protector - Google Patents
Water meter bus protector Download PDFInfo
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- CN210142897U CN210142897U CN201921320107.9U CN201921320107U CN210142897U CN 210142897 U CN210142897 U CN 210142897U CN 201921320107 U CN201921320107 U CN 201921320107U CN 210142897 U CN210142897 U CN 210142897U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 230000001012 protector Effects 0.000 title claims abstract description 15
- 238000005070 sampling Methods 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims abstract description 5
- 238000012806 monitoring device Methods 0.000 claims description 7
- 230000001629 suppression Effects 0.000 claims description 4
- 230000001052 transient effect Effects 0.000 claims description 4
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 150000004706 metal oxides Chemical class 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 208000025274 Lightning injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model provides a water meter bus protector, wherein two input ends of a comparator are connected with an MBUS bus through a sampling circuit, and the output end is connected with a base electrode of a first triode and is grounded through two capacitors which are mutually connected in parallel; the emitter of the first triode is grounded, the collector of the first triode is connected with a direct current power supply and is connected with the base of the second triode, the base of the second triode is grounded through a light emitting diode, the emitter of the second triode is grounded, the collector of the second triode is connected with the base of the third triode, the emitter of the third triode is connected with the direct current power supply, and the collector of the third triode is connected with the voltage end of the relay; the base electrode of the second triode and the collector electrode of the third triode are connected with the grid electrode of the MOS tube, the source electrode of the MOS tube is connected with the direct current input end, and the drain electrode of the MOS tube is connected with the contact MOS tube bus. When a certain intelligent meter is damaged to cause that the current on the line has larger change, the voltage change of the sampling circuit is increased to exceed a threshold value specified by comparison, the circuit can automatically emit light to alarm and cut off the circuit at the same time so as to ensure that other equipment on the line works normally.
Description
Technical Field
The utility model relates to a technical field is copied to the smart meter collection, in particular to water gauge bus protector.
Background
With the development of the information data era, a centralized reading technology brings a new idea to modern city management, and is mostly applied to reading data of intelligent water and gas meters. Wherein the MBUS data reading transmission technology is applied to the centralized reading technology in a large scale, the MBUS data reading transmission technology adopts a working mode that an MBUS bus connects a plurality of downstream intelligent meters together, the MBUS data reading transmission technology has the advantages of accurate reading, strong anti-jamming capability and no need of an external power supply, but the working voltage of the MBUS bus is slightly higher than that of other centralized reading modes, the downstream intelligent meter is not necessarily protected, the intelligent meter is not protected enough, if the peak of the data pulse read by the MBUS bus is slightly higher, the smart meter is likely to be damaged by repeatedly impacting the smart meter for several times, and the downstream smart meter is also damaged by environmental changes such as unstable voltage crosstalk or thunderstorm weather or ESD (electrostatic discharge), meanwhile, the damage and short circuit of the individual intelligent meter can cause the current on the MBUS bus to be larger, so that other intelligent meters can not work normally.
At present, manufacturers generally adopt a mode of reducing the output voltage amplitude of an MBUS bus or simply adding a lightning protection device to protect a downstream intelligent meter, but the problem of damage of the intelligent meter cannot be completely solved, only the damaged intelligent meter can be replaced when the intelligent meter is damaged, the damaged intelligent meter is not isolated from the MBUS bus in the replacement process, so that the MBUS bus needs to stop working when the damaged intelligent meter is replaced, and the damage of the individual intelligent meter can cause that other intelligent meters which are not damaged cannot work.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a can be with damaging the water gauge bus protector that the smart meter was kept apart with the MBUS bus.
In order to solve the technical problem, the utility model provides a water meter bus protector, which comprises a relay and a monitoring device, wherein the monitoring device comprises a comparator, an MOS (metal oxide semiconductor) tube and three relays, two input ends of the comparator are connected with an MBUS (bus) through a sampling circuit, an output end of the comparator is connected with a base electrode of a first triode, a direct-current power supply is connected, and the two capacitors which are connected in parallel are grounded; the emitter of the first triode is grounded, the collector of the first triode is connected with a direct current power supply and is connected with the base of the second triode, the base of the second triode is grounded through a light emitting diode, the emitter of the second triode is grounded, the collector of the second triode is connected with the base of the third triode, the emitter of the third triode is connected with the direct current power supply, and the collector of the third triode is connected with the voltage end of the relay; the base electrode of the second triode and the collector electrode of the third triode are connected with the grid electrode of a P-channel MOS tube, the source electrode of the MOS tube is connected with the direct current input end, and the drain electrode of the MOS tube is connected with a contact MOS tube bus.
Preferably, the first transistor and the second transistor are NPN transistors, and the third diode is a PNP transistor.
Preferably, the power supply further comprises a reset switch, and the emitter of the third triode is connected with the direct-current power supply through the reset switch.
Preferably, a protection device is included, the protection device comprising a lightning protection device consisting of a common mode inductor connected across the MBUS bus.
Preferably, the protection device comprises a thermistor connected to two ends of the MBUS bus, and a varistor and a transient suppression diode connected between two ends of the MBUS bus.
The utility model discloses following beneficial effect has: two input ends of the comparator are connected to the MBUS bus through the sampling circuit, voltage change on the sampling resistor is detected and judged, when a certain intelligent meter is damaged to cause that the current change on the line is larger, the voltage change of the sampling circuit is increased to exceed a threshold value specified by comparison, the circuit can automatically give out light and alarm and cut off the circuit at the same time, so that other equipment on the line can work normally.
Drawings
FIG. 1 is a schematic circuit diagram of a water meter bus protector;
fig. 2 is a schematic circuit diagram of the monitoring device.
Detailed Description
Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The water meter bus protector is connected between an MBUS bus and a single intelligent meter, as shown IN figure 1, the water meter bus protector comprises a protection device, a relay U8 and a monitoring device, the protection device comprises a piezoresistor RV1, thermistors P1 and P2, transient suppression diodes TVS1 and TVS2 and a lightning protection device consisting of a common-mode inductor T1, the MBUS bus is respectively connected with two current branches of the common-mode inductor T1 through an MBUS + contact and an MBUS-contact, one current branch is connected with a direct current input end + DC IN, the other current branch is grounded, the thermistors P1 and P2 are respectively connected with the two current branches, and the piezoresistor RV1, the transient suppression diodes TVS1 and the TVS2 are connected between the two current branches. When voltage sudden change is unstable due to lightning stroke or various reasons in an actual site, the intelligent meter can be effectively buffered when passing through a protection device, and the impact on the reading of the intelligent meter is relieved, so that the intelligent meter is protected. The current branch circuit connected with the direct current input end + DC IN is connected with a 6 th pin of the relay U8, a 7 th pin of the relay U8 is connected with the monitoring device through an LINA contact, a 1 st pin is connected with a power supply end RLY VCC, an 8 th pin is grounded, and a diode D1 is connected between the 1 st pin and the 8 th pin.
As shown in fig. 2, a circuit schematic diagram of the monitoring apparatus is that a negative phase input terminal of a comparator U1A is connected to a contact LINA through resistors R1 and R2, and is grounded through a resistor R3, a positive phase input terminal of the comparator U1A is connected to a contact LINB through a resistor R4, and is grounded through a resistor R5, an output terminal of the comparator U1A is connected to a base of an NPN type triode Q14 through a resistor R6, and is connected to a power source VCC through a resistor R7, and is grounded through capacitors C58 and C59 connected in parallel with each other, a voltage input terminal of the comparator U1A is connected to a DC power supply + DC VCC, and is grounded through a capacitor C55, and a ground terminal of the comparator U1A is. The junction between the base of the triode Q14 and the resistor R6 is grounded through the resistor R8, the emitter of the triode Q14 is grounded, the collector is connected with the direct current power supply + DC VCC through the resistor R9, and is connected with the base of the NPN type triode Q13 through the resistor R10. The junction between the base of the triode Q13 and the resistor R10 is grounded through the resistor R11, and is connected with the anode of the LED through the resistor R12 and the resistor R19, the cathode of the LED is grounded, the emitter of the triode Q13 is grounded, and the collector is connected with the base of the PNP type triode Q6 through the resistor R13. The emitter of the triode Q6 is connected to the DC power supply + DC VCC through the resistor R19 and the reset switch SW1, respectively, and the collector is connected to the RLY VCC through the resistor R14. The junction between the triode Q6 and the resistor R14 and the junction between the resistor R12 and the resistor R18 are grounded through the resistor R17 and are connected with the gate of the P-channel MOS transistor M2 through the resistor R16, the source of the MOS transistor M2 is connected with the direct-current input end + DC IN, and the drain of the MOS transistor is connected with the junction LINA.
The input positive pole of the intelligent meter is connected with the MBUS + through the water meter bus protector, and the input negative pole is connected with the MBUS-line. The input end LINA \ B end of the comparator U1A is connected with a sampling circuit to detect and judge the voltage change on the sampling resistor, because the sampled compared data can not exceed the specified threshold value when the voltage changes slightly. When the current on the line is changed greatly due to the damage of a certain intelligent meter, the voltage change of the sampling circuit is increased to exceed a specified threshold, the circuit can automatically emit light to alarm and cut off the circuit at the same time, so that other equipment on the line can work normally. At the moment, the user can replace the damaged intelligent watch according to the luminous alarm, and after the damaged intelligent watch is replaced, the user can normally use the intelligent watch by pressing the reset switch SW 1. Specifically, the method comprises the following steps: when the intelligent meter is damaged, the change of the sampling voltage of two input ends of a comparator U1A in the monitoring device corresponding to the intelligent meter exceeds a specified threshold value, the comparator U1A outputs a high level, so that a triode Q14 is in saturated conduction, the collector current of the triode Q14 is very large after the triode Q14 is in saturated conduction, a light-emitting diode (LED) emits light to prompt, at the moment, the power supply end of a relay U8 is electrified, and the contact of the relay U8 is changed from closed to open, namely, a circuit is cut off. After the user has changed and has damaged the smart meter, press reset switch SW1, then triode Q6's collecting electrode lug connection DC power supply + DC VCC for triode Q6 switches on, makes triode Q13 switch on, and triode Q13 base voltage and triode Q6 collector voltage are close to and are 0, then emitting diode LED extinguishes, relay U8 power end loses electricity, and its contact becomes the closure from the disconnection, switch-on circuit promptly, but normal use.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the protection scope of the present application, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.
Claims (5)
1. Water gauge bus protector, characterized by: the monitoring device comprises a comparator, an MOS (metal oxide semiconductor) tube and three relays, wherein two input ends of the comparator are connected with an MBUS (bus) through a sampling circuit, and the output end of the comparator is connected with a base electrode of a first triode, is connected with a direct-current power supply and is grounded through two capacitors which are mutually connected in parallel; the emitter of the first triode is grounded, the collector of the first triode is connected with a direct current power supply and is connected with the base of the second triode, the base of the second triode is grounded through a light emitting diode, the emitter of the second triode is grounded, the collector of the second triode is connected with the base of the third triode, the emitter of the third triode is connected with the direct current power supply, and the collector of the third triode is connected with the voltage end of the relay; the base electrode of the second triode and the collector electrode of the third triode are connected with the grid electrode of a P-channel MOS tube, the source electrode of the MOS tube is connected with the direct current input end, and the drain electrode of the MOS tube is connected with a contact MOS tube bus.
2. The water meter bus protector of claim 1, wherein: the first triode and the second triode are NPN triodes, and the third diode is a PNP triode.
3. The water meter bus protector of claim 1 or 2, wherein: the three-phase triode is characterized by comprising a reset switch, and an emitting electrode of the third triode is connected with a direct-current power supply through the reset switch.
4. The water meter bus protector of claim 1, wherein: the device comprises a protection device, wherein the protection device comprises a lightning protection device which is connected with two ends of an MBUS bus and consists of common-mode inductors.
5. The water meter bus protector of claim 4, wherein: the protection device comprises a thermistor respectively connected with two ends of the MBUS bus, and a piezoresistor and a transient suppression diode connected between the two ends of the MBUS bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921320107.9U CN210142897U (en) | 2019-08-14 | 2019-08-14 | Water meter bus protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921320107.9U CN210142897U (en) | 2019-08-14 | 2019-08-14 | Water meter bus protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210142897U true CN210142897U (en) | 2020-03-13 |
Family
ID=69736610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921320107.9U Active CN210142897U (en) | 2019-08-14 | 2019-08-14 | Water meter bus protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210142897U (en) |
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2019
- 2019-08-14 CN CN201921320107.9U patent/CN210142897U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210202 Address after: 410000 Room 201, unit 2, building 3, No.62 Shaoshan Road, Yuhua District, Changsha City, Hunan Province Patentee after: Wu Yiwen Address before: 2501, building 2, Bobo Tianxia City, 368 Furong South Road, Tianxin District, Changsha, Hunan 410000 Patentee before: Hunan Chenghang Electric Power Technology Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240125 Address after: No. 368, Section 1, Furong South Road, Tianxin District, Changsha City, Hunan Province, 410000, Bobo Tianxia City Patentee after: Hunan Chenghang Electric Power Technology Co.,Ltd. Country or region after: China Address before: 410000 Room 201, unit 2, building 3, No.62 Shaoshan Road, Yuhua District, Changsha City, Hunan Province Patentee before: Wu Yiwen Country or region before: China |