CN219843458U - Long-term auxiliary power supply of electric energy meter - Google Patents

Abstract

The utility model provides a long-term auxiliary power supply of an electric energy meter, which is characterized in that an electric wave clock receiving module receives the electric wave clock and updates time into a real-time clock RTC, so that time accuracy is realized, a corresponding control signal is generated by a main control module or a circuit for a power failure state and preset time of the mains supply, a relay is operated, and further, the electric energy meter is stably supplied for a long time through a switch switching circuit, so that incorrect meter reading data caused by local power failure is avoided, and the stability of the electric energy meter data is improved. The storage battery floating charging circuit is used for charging the storage battery pack, and can automatically charge the storage battery pack under the condition that commercial power is normal, so that the electric quantity of the storage battery pack is ensured, and long-term reliable power supply is realized.

Description

Long-term auxiliary power supply of electric energy meter

Technical Field

The utility model relates to the field of power supply of electric energy meters, in particular to a long-term auxiliary power supply of an electric energy meter.

Background

The electric energy meter is a meter for measuring electric energy, also called an electric meter, a fire meter and a kilowatt hour meter. Electric energy metering is an important link of production and operation activities of power enterprises and safe operation of a power grid. The trade settlement and the assessment of the economic and technical indexes of the power system all depend on an accurate and complete electric energy metering device. The performance and management level of the electric energy meter not only relate to the development of the electric power industry and the image of the electric power enterprises, but also influence the accuracy and fairness of trade settlement, and relate to the fundamental interests of vast electric power customers.

In the field operation process, the situations of power supply switching-over, field disabling and the like of a customer exist, so that the electric energy meter is not powered on and cannot be normally collected, marketization and normal remote collection and fee calculation of an agent electricity purchasing customer are influenced, meter reading personnel are required to be arranged for field meter reading, when the electric energy meter has abnormal data, the personnel can be caused to check the data in multiple aspects, the operation is troublesome, the workload of the personnel is increased, the labor cost is increased, and the problem of electric fee disputes caused by abnormal meter reading data also exists.

Disclosure of Invention

In order to solve the problems, the utility model provides a long-term auxiliary power supply for the electric energy meter, which realizes long-term power supply for the electric energy meter, avoids power failure of the electric energy meter, ensures the accuracy degree of data of the electric energy meter and prevents disputes.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a long-term auxiliary power supply of an electric energy meter, which comprises a main control module, an electric wave clock receiving module, a mains supply detector, a mains supply interface, a power supply module and a relay, wherein the main control module is connected with the main control module;

the main control module comprises a BPC decoder, a real-time clock RTC and an OR circuit with a first input end and a second input end;

the output end of the radio wave clock receiving module is connected with the input end of the BPC decoder, the output end of the BPC decoder is connected with the input end of the real-time clock RTC, and the output end of the real-time clock RTC is connected with the first input end of the OR circuit; the output end of the OR circuit is connected with the control end of the relay;

the mains supply interface comprises a first branch output end and a second branch output end;

the input end of the mains supply detector is connected with the first branch output end of the mains supply interface, and the output end of the mains supply detector is connected with the second input end of the circuit;

the second branch output end of the mains supply interface is connected with the normally-closed contact of the relay, and the output end of the power supply module is connected with the normally-open contact of the relay.

Preferably, the wave clock receiving module receives the wave clock signal, demodulates the wave clock signal, and transmits the demodulated wave clock signal to the BPC decoder.

Preferably, a button battery is arranged on the real-time clock RTC;

when the real-time clock RTC is in a preset time window, the real-time clock RTC outputs a low-level signal which is recorded as;

and when the real-time clock RTC is not in the preset time window, outputting a high-level signal by the real-time clock RTC, and recording the high-level signal as the high-level signal.

Preferably, an optocoupler circuit is arranged in the commercial power detector;

when the mains supply is in a normal state, outputting a high-level signal, which is recorded as;

when the mains supply is in a power-down state, a low-level signal is output and recorded as the low-level signal.

Preferably, when the relay receives a high-level signal from the or circuit, the movable contact and the normally-closed contact of the relay are attracted, the movable contact and the normally-open contact of the relay are released, and the circuit between the mains supply interface and the electric energy meter is conducted;

when the relay receives a low-level signal from the OR circuit, the movable contact and the normally-open contact of the relay are attracted, the movable contact and the normally-closed contact of the relay are released, and the circuit between the power supply module and the electric energy meter is conducted.

Preferably, the display device further comprises a nixie tube display unit, wherein the input end of the nixie tube display unit is connected with the output end of the main control module and is used for displaying signals of the main control module, and the signals of the main control module comprise date, time and power-down state of commercial power.

Preferably, the power supply module comprises a power supply module and a storage battery pack, the power supply module is connected with the storage battery pack in a bidirectional manner, the power supply module is used for controlling the storage battery pack to charge or discharge, and the output end of the power supply module is connected with the battery output contact.

Preferably, the storage battery pack adopts a lead-acid storage battery.

Preferably, the utility power interface further comprises a third output end, the power module further comprises a floating charging circuit, the floating charging output end is connected with the input end of the floating charging circuit, and the output end of the floating charging circuit is connected with the input end of the storage battery pack.

Preferably, the storage battery pack is located outside the housing of the electric energy meter.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model provides a long-term auxiliary power supply of an electric energy meter, which is characterized in that an electric wave clock receiving module receives the electric wave clock and updates time into a real-time clock RTC, so that time accuracy is realized, a relay is operated by a power-down state of a main control module or a circuit of the electric energy meter and a signal generated by the real-time clock RTC, a switching circuit is further realized, long-term stable power supply of the electric energy meter can be realized, incorrect meter reading data caused by local power failure is avoided, and the stability of the data of the electric energy meter is improved.

Further, the floating charging circuit is used for charging the storage battery, and can automatically charge the storage battery under the condition that the commercial power is normal, so that the electric quantity of the storage battery is ensured, and long-term reliable power supply is realized.

Drawings

Fig. 1 is a circuit structure diagram of a long-term auxiliary power supply of an electric energy meter.

Fig. 2 is a block diagram of a specific embodiment of a long-term auxiliary power supply for an electric energy meter according to the present disclosure.

The device comprises a main control module, a first control module and a second control module, wherein the main control module is used for controlling the main control module; 11. a BPC decoder; 12. a real time clock RTC; 2. a radio wave clock receiving module; 3. a power supply module; 31. a power module; 32. a battery pack; 4. a relay; 5. or a circuit; 6. a nixie tube display unit; 7. a mains detector; 8. and a mains supply interface.

Detailed Description

Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

The utility model will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the utility model.

The utility model provides a long-term auxiliary power supply of an electric energy meter, referring to fig. 1 and 2, which comprises a main control module 1, an electric wave clock receiving module 2, a mains supply detector 7, a mains supply interface 8, a power supply module 3 and a relay 4;

the main control module 1 comprises a BPC decoder 11, a real-time clock RTC12 and an OR circuit 5 with a first input end and a second input end;

the output end of the radio wave clock receiving module 2 is connected with the input end of the BPC decoder 11, the output end of the BPC decoder 11 is connected with the input end of the real-time clock RTC12, and the output end of the real-time clock RTC12 is connected with the first input end of the OR circuit 5; the output end of the OR circuit 5 is connected with the control end of the relay 4;

the mains supply interface 8 comprises a first branch output end and a second branch output end;

the input end of the mains supply detector 7 is connected with the first branch output end of the mains supply interface 8, and the output end of the mains supply detector 7 is connected with the second input end of the OR circuit 5;

the second branch output end of the mains supply interface 8 is connected with the normally closed contact of the relay 4, and the output end of the power supply module 3 is connected with the normally open contact of the relay 4.

The electric wave clock receiving module 2 is used for receiving an electric wave clock signal and demodulating the electric wave clock signal to obtain clock coding pulses; the BPC encoder 11 is configured to decode the clock encoding pulse according to a BPC encoding rule to obtain clock information, and update the real-time clock RTC12; the utility power detector 7 detects the utility power state of the current utility power interface 8, wherein the utility power state comprises a power-down state and a normal state, and when the real-time clock RTC12 is in a preset meter reading time window and the utility power is in the power-down state, the circuit 5 controls the relay 4 to switch the power supply module 3;

accurate time setting is realized by adopting the electric wave clock, and accurate time is ensured. The wave clock adopts long waves transmitted along the ground surface, and has lower requirements on the installation position of the receiving device and the directivity of the antenna, so the wave clock is very suitable for being used in an electric cabinet in the open air.

The radio wave clock signal of the broadcast clock with the carrier frequency of 68.5K is acquired, received by a long wave magnetic rod antenna of the device, then sent to the radio wave clock receiving module 2 to be modulated to obtain clock coding pulses, the received clock coding pulses are decoded according to the BPC coding rule, and the high-precision real-time clock on the main control board is updated after the decoding is successful. The high-precision RTC chip MAX3231 is adopted as a local real-time clock. Because the MAX3231 can maintain high time accuracy in an independent operation state for a long time, even if an accumulated error occurs in the case that a radio wave signal cannot be correctly received due to abnormal conditions such as disturbance of a climate condition, electromagnetic interference, etc., the accumulated error of the local RTC can be eliminated as long as the radio wave signal can be successfully and correctly received at one time, thereby ensuring the accuracy of the local RTC.

In order to save electricity to a great extent, the standby power supply is turned on only when the following two conditions are simultaneously satisfied: the first is that the clock signal of the current real-time clock is in a preset meter reading time window; and the second is that the mains supply is in a power-down state. Because the accurate local time is obtained by updating the local RTC, the current state of the mains supply needs to be detected, and when the two conditions are met simultaneously, or the circuit 5 controls the relay 4 to switch from the mains supply interface 8 to the power supply module 3, the power supply module 3 can supply power to the electric energy meter.

In an embodiment of the present utility model, referring to fig. 1 and 2, the wave clock receiving module 2 receives a wave clock signal, demodulates the wave clock signal, and transmits the demodulated wave clock signal to the BPC decoder 11.

The BPC decoder 11 is configured to decode, and the BPC decoder 11 selects a BPC low-frequency time code timing signal to decode an asic chip.

The BPC decoder 11 decodes the BPC coded information back into clock information including year, month, day, time, minute, week, etc., in BCD coded format, one-second one-bit BCD code. A BCD code is represented by a high-low level width within one second, twenty seconds, and one frame.

In an embodiment of the present utility model, referring to fig. 1 and 2, a button battery is disposed on the real-time clock RTC12;

the real-time clock RTC12 outputs a low-level signal which is recorded as 0 when the real-time clock RTC is in a preset time window;

when not in the preset time window, the real-time clock RTC12 outputs a high-level signal, which is denoted as 1.

The timer of the real-time clock RTC12 can determine whether the clock signal is within a preset meter reading time window, and generate a corresponding signal.

Button cell generally assembles on equipment, and all need not change for a long time, is in the inside of equipment, rarely carries out direct contact with the external world, can obtain fine protection, and life is longer. And a stable discharge voltage state and stable current are presented in the continuous output process. The button cell looks like a small volume, but in fact, it stores a large amount of current in a limited space, and can maintain the continuous operation of the electronic equipment for a long time. Button cells are lightweight and small in size and are often used in a variety of precision and tiny devices. MAX3231 is guaranteed to continue to run even in the event of a complete power loss.

In the embodiment of the present utility model, referring to fig. 1 and 2, an optocoupler circuit is built in the mains detector 7;

when the mains supply is in a normal state, outputting a high-level signal which is recorded as 1;

when the mains supply is in a power-down state, a low-level signal is output and recorded as 0.

In order to obtain the state of the mains supply, an AC detection circuit is designed, which is realized by an optocoupler circuit, since the electrical isolation is required.

Whether to switch to the standby power supply is determined by judging whether the current commercial power exists or not. If the mains supply is always in a normal state within a specified time period, continuing to supply power to the electric energy meter or the meter collector by the mains supply; if the mains supply is detected in a power-down state within a prescribed period of time, the power is automatically switched to the battery pack 32 for power supply. The battery pack 32 does not power the meter or meter collector outside of the prescribed period of time.

In a specific embodiment of the present utility model, referring to fig. 1 and 2, the power supply module 3 includes a power module 31 and a battery pack 32, the power module 31 and the battery pack 32 are connected in two directions, the power module 31 is used for controlling the charging or discharging of the battery pack 31, and an output end of the power module 31 is connected with a battery output contact.

In an embodiment of the present utility model, referring to fig. 1 and 2,

when the relay 4 receives a high-level signal from the OR circuit 5, the movable contact and the normally-closed contact of the relay 4 are attracted, the movable contact and the normally-open contact of the relay 4 are released, and a circuit between the mains interface 8 and the electric energy meter is conducted;

when the relay 4 receives a low-level signal from the OR circuit 5, the movable contact and the normally-open contact of the relay 4 are attracted, the movable contact and the normally-closed contact of the relay 4 are released, and the circuit between the power supply module 3 and the electric energy meter is conducted.

Besides the electric energy meter, the power supply module 3 can also supply power for the meter reading device, and the switching of the mains supply interface 8 and the power supply module 3 is realized by combining a double-pole double-throw switch.

In a specific embodiment of the present utility model, referring to fig. 1 and 2, the display device further includes a nixie tube display unit 6, wherein an input end of the nixie tube display unit 6 is connected with an output end of the main control module 1, and is used for displaying signals of the main control module 1, and the signals of the main control module 1 include a date, a time and a power failure state of a mains supply.

For convenient observation, the current date and time are displayed in a wheel display mode through a highlighting LED nixie tube. In addition, the power failure state of the power grid, the output state of the relay 4, the BPC original pulse signal and the BPC receiving correct mark are indicated by the LED nixie tube, so that the observation and the debugging are convenient.

In an embodiment of the present utility model, referring to fig. 1 and 2, the battery pack 32 is a lead-acid battery.

The lead-acid storage battery has higher voltage of 12.0V and low price, can be used for manufacturing storage batteries with different structures and battery capacities of 1Ah to thousands Ah, has good high-rate discharge performance, can be used for starting an engine, has good high-low temperature performance, can work in a temperature range of-40 to 60 ℃, has electric energy efficiency of 60 percent, is easy to float charge and use, has no memory effect, reduces the temporary capacity of the battery, shortens the service time, is easy to identify the state of charge, and can reflect the residual capacity of the battery.

Considering the problem of capacity reduction of the storage battery at low temperature, the high-energy environment-friendly lead-acid storage battery with sufficient capacity is adopted, and reliable discharge can be ensured at the ambient temperature of minus 30 degrees.

In an embodiment of the present utility model, referring to fig. 1 and 2, the utility power interface 8 further includes a third output end, the power module 31 further includes a floating circuit, the third output end is connected to an input end of the floating circuit, and an output end of the floating circuit is connected to an input end of the battery pack 32.

As the storage battery is left for a longer period of time, the amount of electricity in the storage battery gradually decreases, which is caused by the self-discharge characteristic of the storage battery. In order to avoid such capacity loss due to self-discharge of the battery, it is necessary to charge the secondary battery continuously for a long period of time at a constant voltage. This charging mode is floating charging. In the float charge mode, the charging module does not stop charging even if the battery is in a full state, and a constant float charge voltage and a small float charge flow are provided to the battery.

In the daily operation process of the communication power supply, the storage battery and the charging module are operated in parallel, and when the commercial power is normal, the voltage of the storage battery and the charging module is basically constant and only slightly higher than the open-circuit voltage of the storage battery, and the loss of the storage battery caused by self-discharging is compensated by a small amount of current supplied by the charging module so that the storage battery can be always kept in a full state without overcharging. Therefore, the storage battery can be charged and discharged along with the fluctuation of the power line voltage. When the load is light and the voltage of the power supply line is high, the storage battery is charged, and when the load is heavy or the mains supply is interrupted accidentally, the storage battery is discharged to share part or all of the load. Therefore, the storage battery plays a role in stabilizing voltage and is in a standby state.

A floating charge circuit is built in the power supply module 31, and the mains supply interface 8 can automatically charge the storage battery pack 32 through the floating charge circuit of the power supply module 31 under the condition that the mains supply is normal, so that the full power of the storage battery pack 32 is ensured, and long-term reliable power supply is realized.

In an embodiment of the present utility model, referring to fig. 1 and 2, the battery pack 32 is located outside the housing of the electric energy meter.

The components are arranged in a standard national net three-phase multifunctional electric energy meter case, and the case can be conveniently arranged in a common electric cabinet. And the external storage battery pack 32 is arranged in the electric cabinet, so that the storage battery pack can be replaced in time after being conveniently worn.

While the utility model has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the utility model is not limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (10)

1. The electric energy meter long-term auxiliary power supply is characterized by comprising a main control module (1), an electric wave clock receiving module (2), a mains supply detector (7), a mains supply interface (8), a power supply module (3) and a relay (4);

the main control module (1) comprises a BPC decoder (11), a real-time clock RTC (12) and an OR circuit (5) with a first input end and a second input end;

the output end of the radio wave clock receiving module (2) is connected with the input end of the BPC decoder (11), the output end of the BPC decoder (11) is connected with the input end of the real-time clock RTC (12), and the output end of the real-time clock RTC (12) is connected with the first input end of the OR circuit (5); the output end of the OR circuit (5) is connected with the control end of the relay (4);

the mains supply interface (8) comprises a first branch output end and a second branch output end;

the input end of the mains supply detector (7) is connected with the first branch output end of the mains supply interface (8), and the output end of the mains supply detector (7) is connected with the second input end of the circuit (5);

the second branch output end of the mains supply interface (8) is connected with the normally closed contact of the relay (4), and the output end of the power supply module (3) is connected with the normally open contact of the relay (4).

2. The electric energy meter long-term auxiliary power supply according to claim 1, wherein the electric wave clock receiving module (2) receives an electric wave clock signal, demodulates the electric wave clock signal and transmits the demodulated electric wave clock signal to the BPC decoder (11).

3. The long-term auxiliary power supply of an electric energy meter according to claim 1, characterized in that a button cell is arranged on the real-time clock RTC (12);

when the real-time clock RTC (12) outputs a low-level signal in a preset time window, the low-level signal is recorded as 0;

when the real-time clock RTC (12) is not in a preset time window, the real-time clock RTC (12) outputs a high-level signal which is recorded as 1.

4. The long-term auxiliary power supply of an electric energy meter according to claim 1, characterized in that an optocoupler circuit is built in the mains detector (7);

when the mains supply is in a normal state, outputting a high-level signal which is recorded as 1;

when the mains supply is in a power-down state, a low-level signal is output and recorded as 0.

5. The long-term auxiliary power supply of the electric energy meter according to claim 1, wherein when the relay (4) receives a high-level signal from the or circuit (5), the movable contact and the normally-closed contact of the relay (4) are attracted, the movable contact and the normally-open contact of the relay (4) are released, and the circuit between the mains interface (8) and the electric energy meter is conducted;

when the relay (4) receives a low-level signal from the OR circuit (5), the movable contact and the normally open contact of the relay (4) are attracted, the movable contact and the normally closed contact of the relay (4) are released, and the circuit between the power supply module (3) and the electric energy meter is conducted.

6. The long-term auxiliary power supply of the electric energy meter according to claim 1, further comprising a nixie tube display unit (6), wherein the input end of the nixie tube display unit (6) is connected with the output end of the main control module (1) and is used for displaying signals of the main control module (1), and the signals of the main control module (1) comprise date, time and power-down state of mains supply.

7. The long-term auxiliary power supply for the electric energy meter according to claim 1, wherein the power supply module (3) comprises a power supply module (31) and a storage battery pack (32), the power supply module (31) and the storage battery pack (32) are connected in a bidirectional manner, the power supply module (31) is used for controlling the storage battery pack (31) to charge or discharge, and an output end of the power supply module (31) is connected with a battery output contact.

8. The electric energy meter long-term auxiliary power supply according to claim 7, characterized in that said battery pack (32) employs a lead-acid battery.

9. The long-term auxiliary power supply for the electric energy meter according to claim 7, wherein the mains supply interface (8) further comprises a third output end, the power module (31) further comprises a floating charging circuit, the floating charging output end is connected with the input end of the floating charging circuit, and the output end of the floating charging circuit is connected with the input end of the storage battery pack (32).

10. The electric energy meter long-term auxiliary power supply according to claim 7, characterized in that the battery (32) is located outside the housing of the electric energy meter.