CN213125654U - Intelligent electric meter - Google Patents
Intelligent electric meter Download PDFInfo
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- CN213125654U CN213125654U CN202021495592.6U CN202021495592U CN213125654U CN 213125654 U CN213125654 U CN 213125654U CN 202021495592 U CN202021495592 U CN 202021495592U CN 213125654 U CN213125654 U CN 213125654U
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Abstract
The application relates to an intelligent ammeter, belonging to the field of intelligent meter reading equipment; the power supply conversion module comprises a base meter module, a power supply conversion module and a communication module, wherein the input end of the power supply conversion module is used for connecting a three-phase power grid, the output end of the power supply conversion module is used for supplying power to the base meter module and the communication module respectively, a protection module is arranged between the communication module and the power supply conversion module and used for detecting the working current passing through the communication module and controlling the on-off of a passage between the communication module and the power supply conversion module according to the working current. This application has the effect that improves smart electric meter safety in utilization.
Description
Technical Field
The application relates to the field of intelligent meter reading equipment, in particular to an intelligent ammeter.
Background
With the development of scientific technology, the centralized meter reading technology is rapidly developed, and the current national power grid pushes a modular intelligent electric meter to be the main and is matched with a centralized meter reading system to realize the aim of intelligent meter reading. The traditional mechanical electric energy meter and the early intelligent electric energy meter are not provided with communication modules, and intelligent meter reading cannot be realized, so that the national power grid vigorously pushes the modular intelligent electric energy meter with the communication modules in the national range.
The existing ammeter is provided with a socket for the insertion of the communication module, the communication module is connected with the socket through a contact pin, so that the communication module is connected with the ammeter, and the aim of intelligent meter reading of the ammeter is fulfilled. However, the communication module may have a short circuit in the production process of the communication module itself or a short circuit of an interface of the communication module due to a misplaced contact pin when the communication module is replaced, which further causes a short circuit or burnout of a power supply module of the electric meter, and causes the whole intelligent electric meter not to work normally.
SUMMERY OF THE UTILITY MODEL
In order to improve the security that smart electric meter used, reduce the communication module trouble and to the influence that the ammeter used, this application provides an intelligent ammeter.
The application provides an intelligent ammeter adopts following technical scheme:
the utility model provides an intelligent ammeter, includes base table module, power conversion module and communication module, power conversion module's input is used for connecting the three-phase electric wire netting, and its output is base table module and communication module power supply respectively, be equipped with protection module between communication module and the power conversion module, protection module is used for detecting the operating current size through communication module and controls the break-make of the route between communication module and the power conversion module according to the operating current size.
Through adopting above-mentioned technical scheme, through setting up protection module between power conversion module and communication module, protection module detects communication module's operating current, thereby when communication module takes place the short circuit, make the route disconnection between communication module and the power conversion module, thereby realize that communication module's trouble can not influence power conversion module's normal work, in order to improve the practical security of smart electric meter, simultaneously because under protection module's guard action during communication module trouble, smart electric meter's other module functions are not influenced, thereby improve smart electric meter job stabilization nature.
Preferably, the protection module comprises a protection input interface for connecting the output end of the power conversion module, a protection output interface for connecting the power input end of the communication module, and a protection circuit arranged between the protection input interface and the protection output interface.
By adopting the technical scheme, the protection input interface and the protection output interface are arranged to realize the connection between the protection module and the power conversion module as well as the communication module, and the on-off control of the passage between the communication module and the power conversion module is realized through the protection circuit.
Preferably, the protection circuit comprises an overcurrent protection chip connected in series between the protection output interface and the protection input interface, a limiting resistor is arranged between the fourth pin of the overcurrent protection chip and the protection input interface, a current limiting resistor is arranged between the third pin of the overcurrent protection chip and the ground, and the current limiting resistor is used for limiting the maximum current value of the overcurrent protection circuit.
By adopting the technical scheme, the overcurrent protection chip peripheral circuit is constructed by setting the limiting resistor and the current-limiting resistor so as to ensure the normal work of the overcurrent protection chip, and meanwhile, the overcurrent protection chip sets the maximum current of the current-passing communication module through the current-limiting resistor.
Preferably, the current limiting resistor is an adjustable resistor.
By adopting the technical scheme, the adjustable resistor is used as the current-limiting resistor to adjust the resistance value of the current-limiting resistor connected into the power supply loop, so that a user can conveniently adjust the protection threshold current of the protection circuit according to the use requirement.
Preferably, the limiting resistor is a patch resistor.
Through adopting above-mentioned technical scheme, it is littleer to adopt SMD resistance to compare in formula resistance volume directly, is convenient for reduce protection module's volume, compares in formula component directly simultaneously, and SMD component can effectively improve the stability and the reliability of circuit.
Preferably, a second pin of the overcurrent protection chip is grounded, an input capacitor is arranged between the protection input interface and the second pin of the overcurrent protection chip, and the input capacitor is used for filtering input voltage; an output capacitor is arranged between the protection output interface and the second pin of the overcurrent protection chip and used for filtering output voltage.
By adopting the technical scheme, the input capacitor and the output capacitor are arranged to filter the input voltage and the output voltage of the over-current protection chip, so that the stability of the input voltage and the output voltage of the over-current protection chip is improved, and voltage ripples are reduced.
Preferably, the input capacitor and the output capacitor are patch capacitors.
Through adopting above-mentioned technical scheme, it is littleer to adopt SMD electric capacity to compare in formula electric capacity volume directly, is convenient for reduce protection module's volume, compares in formula component directly simultaneously, and SMD component can effectively improve the stability and the reliability of circuit.
In summary, the present application includes at least one of the following beneficial technical effects:
the protection module is additionally arranged on the power conversion module and the communication module, and the on-off of a channel between the unit conversion module and the communication module is controlled through the protection module, so that the influence of the fault of the communication module on the power conversion module is reduced, and the use safety and stability of the intelligent ammeter are improved;
the protection circuit can be built by five elements, namely an overcurrent protection chip, an input capacitor, an output capacitor, a limiting resistor and a current limiting resistor, the cost is low, the cost is lower compared with the cost for replacing the whole intelligent electric meter after the communication module fails, and the replacement of the communication module is more convenient and quicker;
after the communication module is short-circuited, the intelligent electric meter is under the protection effect of the protection module, and other functions of the intelligent electric meter are not affected by the fault of the communication module and can still work normally, so that the stability of the intelligent electric meter is improved.
Drawings
FIG. 1 is a block diagram of the overall architecture of the present application;
FIG. 2 is a schematic diagram of a circuit structure of a protection module of the present application;
FIG. 3 is a flow chart illustrating the steps of the present application.
Description of reference numerals: 1. a base table module; 2. a power conversion module; 3. a protection module; 4. and a communication module.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
At present, have the smart electric meter of communication module 4, usually only rely on the smart electric meter to solve communication module 4 short circuit and lead to the problem that the whole electrical power generating system of smart electric meter can not work for communication module 4's DCDC power chip self, this mode risk is high, contact pin dislocation leads to communication module 4 short circuit when short circuit or change communication module 4 in communication module 4 self production process, and then burn out DCDC power chip and make it can not normally work the output, cause the condition that smart electric meter and communication module 4 can not normally work to take place occasionally.
The embodiment of the application discloses intelligent ammeter, refer to fig. 1, intelligent ammeter includes basic table module 1, power conversion module 2 and communication module 4, and power conversion module 2's input is used for connecting the three-phase electric wire netting, and power conversion module 2's output is connected respectively in basic table module 1 and communication module 4, for basic table module 1 and communication module 4 power supply to guarantee its work.
Referring to fig. 1, in order to reduce the influence of the fault of the communication module 4 on the normal operation of the base meter module 1, a protection module 3 is arranged between the communication module 4 and the power conversion module 2, and the protection module 3 is used for detecting the magnitude of the working current passing through the communication module 4 and controlling the on-off of the passage between the communication module 4 and the power conversion module 2 according to the magnitude of the working current. The protection module 3 is provided with a protection threshold current, and when the protection module 3 detects that the working current flowing through the communication module 4 is lower than the protection threshold current, the protection module 3 switches on the communication module 4 and the power conversion module 2, so that the communication module 4 is connected into a circuit and works normally; when the protection module 3 detects that the working current flowing through the communication module 4 exceeds the protection threshold current, the protection module 3 disconnects the passage between the power conversion module 2 and the communication module 4, so that the influence of the fault of the communication module 4 on the power conversion module 2 is reduced, and the normal work of the electric meter base table is influenced.
Referring to fig. 2, the protection module 3 includes a protection input interface VIN for connecting the output terminal of the power conversion module 2, a protection output interface VOUT for connecting the power input terminal of the communication module 4, and a protection circuit disposed between the protection input interface VIN and the protection output interface VOUT. The protection module 3 can be directly added in the production and manufacturing process of a new meter, and can also be added on the base meter module 1 and the communication module 4 of an old meter through wiring, so that the old meter can be reformed at low cost, and the use safety of the installed or produced old meter is improved.
Referring to fig. 2, the protection circuit includes an overcurrent protection chip U connected in series between the protection output interface VOUT and the protection input interface VIN, wherein a fifth pin of the overcurrent protection chip U is connected to the protection input interface VIN, and a first pin of the overcurrent protection chip U is connected to the protection output interface VOUT. A limiting resistor R1 is arranged between the fourth pin of the overcurrent protection chip U and the protection input interface VIN, the second pin of the overcurrent protection chip U is grounded, a current limiting resistor R2 is arranged between the third pin of the overcurrent protection chip U and the second pin of the overcurrent protection chip U, and the current limiting resistor R2 is used for limiting the maximum current value of the overcurrent protection circuit, namely the magnitude of the protection threshold current of the protection circuit is determined by the resistance value of the current limiting resistor R2.
Referring to fig. 2 and 3, in the actual use detection process, the larger the resistance of the current limiting resistor R2 is, the smaller the protection threshold current is, and in order to facilitate the user to adjust the protection threshold current of the protection circuit according to the use requirement, the current limiting resistor R2 is an adjustable resistor, and the resistance of the current limiting resistor R2 connected to the power supply loop is adjusted. When the resistance value of the current limiting resistor R2 connected to the power supply loop is increased, the protection threshold current is reduced, so that the sensitivity of the protection module 3 is improved; when the resistance value of the current limiting resistor R2 connected to the power supply loop decreases, the protection threshold current increases, so that the sensitivity of the protection module 3 decreases.
Referring to fig. 2, in order to improve the stability of the input and output voltages of the overcurrent protection chip U and reduce voltage ripples, an input capacitor C1 is arranged between the protection input interface VIN and the second pin of the overcurrent protection chip U, and the input capacitor C1 is used for filtering the input voltage; an output capacitor C2 is arranged between the protection output interface VOUT and a second pin of the overcurrent protection chip U, and the output capacitor C2 is used for output voltage filtering. For the whole volume that reduces protection module 3, current-limiting resistor R2 adopts SMD resistance, output capacitor C2, input capacitor C1 all adopts SMD electric capacity, thereby make current-limiting resistor R2, output capacitor C2 and input capacitor C1's volume littleer, be convenient for to the transformation of old table, reduce the space of old table to the influence of protection module 3 installation, compare in directly inserting the formula component simultaneously, SMD component can effectively improve the stability and the reliability of circuit, and when the damage appears in the component, SMD component changes more easily.
Referring to fig. 2 and 3, the overcurrent protection chip U in the present application adopts the AP1610 to protect the IC, which has an advantage of fast response speed, and when the communication module 4 is short-circuited, the overcurrent protection chip U can respond within 400ns, so as to quickly disconnect a path between the power conversion module 2 and the communication module 4, so as to protect the power conversion module 2 and the base meter module 1. When the power conversion module 2 is connected to a three-phase power grid, that is, the smart electric meter is powered on, the overcurrent protection chip U detects the magnitude of the working current flowing through the communication module 4, and when the overcurrent protection chip U detects that the working current of the communication module 4 exceeds the protection threshold current preset by the protection module 3, the internal circuit of the overcurrent protection chip U is disconnected, so that the path between the power conversion module 2 and the communication module 4 is disconnected, and the power conversion module 2 does not supply power to the communication module 4 any more. After a worker replaces the communication module 4 with a fault or readjusts the plugging position of the communication module 4 and the base meter module 1, the protection circuit is reset, the overcurrent protection chip U detects the magnitude of the working current flowing through the communication module 4 again, whether the working current of the communication module 4 is recovered to be normal or not is detected, when the overcurrent protection chip U detects that the working current of the communication module 4 is lower than the protection threshold current, the power conversion module 2 stably supplies power to the communication module 4, and when the overcurrent protection chip U detects that the working current of the communication module 4 still exceeds the protection threshold current, the protection circuit continues to cut off the path between the power conversion module 2 and the communication module 4. Thereby realize improving the security in the ammeter use through increasing protection module 3, simultaneously with protection module 3's low-cost trade the cost that whole smart electric meter changed, can effectively reduce the replacement cost that smart electric meter caused because of communication module 4 trouble, simultaneously for changing whole smart electric meter, it is not only lower that only change communication module 4 cost, it is fast to resume, and behind communication module 4 short chain trouble, protection module 3 is in the protect state always, other functions of smart electric meter still can normally work, improve the stability of smart electric meter work.
The implementation principle of the application is as follows: the overcurrent protection chip U detects the working current flowing through the communication module 4, when the communication module 4 is short-circuited, the overcurrent protection chip U detects that the working current of the communication module 4 exceeds the protection threshold current preset by the protection module 3, and the internal circuit of the overcurrent protection chip U is disconnected, so that the passage between the power conversion module 2 and the communication module 4 is disconnected, and the power conversion module 2 does not supply power to the communication module 4 any more. After a worker replaces the communication module 4 with a fault or readjusts the insertion position of the communication module 4 and the base meter module 1, the protection circuit is reset, the overcurrent protection chip U detects the magnitude of the working current flowing through the communication module 4 again, whether the working current of the communication module 4 is normal or not is detected, and if yes, the power supply conversion module 2 supplies power to the communication module 4 stably; if not, the protection circuit continues to cut off the path between the power conversion module 2 and the communication module 4 until the working current of the communication module 4 returns to normal.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (7)
1. The utility model provides an intelligent ammeter, includes basic table module (1), power conversion module (2) and communication module (4), the input of power conversion module (2) is used for connecting the three-phase electric wire netting, and its output is basic table module (1) and communication module (4) power supply, its characterized in that respectively: and a protection module (3) is arranged between the communication module (4) and the power conversion module (2), and the protection module (3) is used for detecting the working current passing through the communication module (4) and controlling the on-off of a passage between the communication module (4) and the power conversion module (2) according to the working current.
2. An intelligent electricity meter according to claim 1, wherein: the protection module (3) comprises a protection input interface used for being connected with the output end of the power supply conversion module (2), a protection output interface used for being connected with the power supply input end of the communication module (4), and a protection circuit arranged between the protection input interface and the protection output interface.
3. An intelligent electricity meter according to claim 2, wherein: the protection circuit comprises an overcurrent protection chip which is connected in series between a protection output interface and a protection input interface, a limiting resistor is arranged between a fourth pin of the overcurrent protection chip and the protection input interface, a current limiting resistor is arranged between a third pin of the overcurrent protection chip and the ground, and the current limiting resistor is used for limiting the maximum current value of the overcurrent protection circuit.
4. An intelligent electricity meter according to claim 3, wherein: the current limiting resistor is an adjustable resistor.
5. An intelligent electricity meter according to claim 3, wherein: the limiting resistor is a patch type resistor.
6. An intelligent electricity meter according to claim 3, wherein: a second pin of the overcurrent protection chip is grounded, and an input capacitor is arranged between the protection input interface and the second pin of the overcurrent protection chip and used for filtering input voltage; an output capacitor is arranged between the protection output interface and the second pin of the overcurrent protection chip and used for filtering output voltage.
7. An intelligent electricity meter according to claim 6, wherein: and the input capacitor and the output capacitor adopt patch capacitors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021495592.6U CN213125654U (en) | 2020-07-24 | 2020-07-24 | Intelligent electric meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021495592.6U CN213125654U (en) | 2020-07-24 | 2020-07-24 | Intelligent electric meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213125654U true CN213125654U (en) | 2021-05-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021495592.6U Active CN213125654U (en) | 2020-07-24 | 2020-07-24 | Intelligent electric meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213125654U (en) |
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2020
- 2020-07-24 CN CN202021495592.6U patent/CN213125654U/en active Active
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