Special power supply for meter

Abstract

The utility model relates to a special power supply for a meter. The special power supply comprises a cabinet body, a mutual inductor connected with alternating current is arranged in the cabinet body; the mutual inductor is electrically connected with the input end of the rectifier and one input end of the switching circuit. The rectifier is electrically connected with the accumulator; the energy storage device comprises a battery pack A and a battery pack B which supply power independently; the voltage of the battery pack A is higher than that of the battery pack B; the charging capacity of the battery pack A is lower than that of the battery pack B; the battery pack A and the battery pack B are electrically connected with an inverter respectively; the inverter is electrically connected with the other input end of the switching circuit; the device is reasonable in design, compact in structure and convenient to use.

Description

Technical Field

[0001] This utility model relates to a dedicated power supply for meters. Background Technology

[0002] Agricultural drainage transformers experience power outages during non-agricultural periods or intermittent outages. The backend system cannot adjust in time, and power outages at concentrators or meters cause data collection failures, affecting statistical results and resulting in substandard line losses. A solution is to draw power from the high-voltage side of the transformer via a voltage transformer, and then convert the power supply to the concentrators and meters. For example, patent CN201910425337.X.

[0003] The drawbacks of existing technology are as follows: 1) It involves high-voltage components, resulting in high cost. 2) It has low safety; if the high-voltage components are damaged, it may cause secondary damage to the low-voltage components, posing a risk to personal safety (users are unaware of this risk). 3) Installing voltage transformers on the high-voltage side requires a power outage, which is inconvenient and requires an operation ticket. 4) It cannot guarantee data transmission during short-term power outages of agricultural drainage transformers. Utility Model Content

[0004] Based on the above problems, during the improvement process, this utility model discovered that ordinary power supplies can be used for electricity theft, causing equipment safety hazards and the risk of electric shock to people.

[0005] In general, the technical problem to be solved by this utility model is to provide a dedicated power supply for meters.

[0006] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0007] A dedicated power supply for meters includes a cabinet; an AC transformer is installed in the cabinet; the transformer is electrically connected to the input terminal of a rectifier and an input terminal of a switching circuit.

[0008] The rectifier is electrically connected to the energy storage device;

[0009] The energy storage device includes independently powered battery pack A and battery pack B;

[0010] The voltage of battery pack A is higher than the voltage of battery pack B;

[0011] The charging capacity of battery pack A is lower than that of battery pack B.

[0012] Battery pack A and battery pack B are each electrically connected to an inverter;

[0013] The inverter is electrically connected to the other input terminal of the switching circuit;

[0014] The switching circuit is electrically connected to meters and concentrators.

[0015] As a further improvement to the above technical solution:

[0016] The current transformer is connected to the low-voltage side of the transformer;

[0017] Instrument transformers include current transformers or voltage transformers;

[0018] The concentrator collects data from the meters and uploads it to a remote location.

[0019] The output of the selector switch is electrically connected to the inverter; the inverter is electrically connected to the switching circuit.

[0020] One output terminal of battery pack B is electrically connected to battery pack A through diode D3.

[0021] The energy storage device is electrically connected to the battery management system (BMS).

[0022] Battery pack A is electrically connected to the controller and communication module via a normally closed switch;

[0023] The controller is electrically connected to the remote end via a communication module.

[0024] The controller is electrically connected to the relay at the output of the current transformer; the relay output is electrically connected to the input of the rectifier and an input of the switching circuit.

[0025] The controller has an electrical connection selection switch used to switch between battery pack A and battery pack B.

[0026] The selector switch includes transistor Q1, resistors RZ1, R2, and R3; and Zener diode DZ3.

[0027] The output terminal VCC1 of battery pack A is split into two paths after passing through resistor R3. One path is grounded through resistor RZ1, and the other path is connected to the base of transistor Q1.

[0028] The output terminal VCC2 of battery pack B is connected to the collector of transistor Q1;

[0029] The emitter of transistor Q1 is electrically connected to the inverter input terminal through resistor R2;

[0030] The output terminal VCC2 is electrically connected to the inverter input terminal through the Zener diode DZ3.

[0031] Hinges are provided on the cabinet to connect the door panels;

[0032] Side pressure bars are installed on the door panel;

[0033] The side pressure bar is installed on the moving page of the hinge;

[0034] A normally closed switch is installed in the cabinet;

[0035] When the cabinet is closed, the side pressure rod presses against the normally closed switch, causing the normally closed switch to open.

[0036] When the cabinet is opened, the side pressure rod is released, and the normally closed switch is closed.

[0037] The switching circuit can be a manual switch switching circuit or an automatic switching circuit.

[0038] The energy storage device is electrically connected to a photovoltaic panel.

[0039] This utility model achieves its functionality by incorporating a side pressure bar on the door. The door is powered on when opened and closed when powered off, providing anti-theft protection while ensuring electrical safety. It also utilizes dual batteries, enabling high-voltage battery startup and high-capacity battery operation for extended battery life. Furthermore, the high-voltage battery can supplement the low-voltage, high-capacity battery, increasing the overall battery life.

[0040] The battery can be charged via AC charging and photovoltaic panel charging.

[0041] Automatic or active switching between the two batteries can be achieved by selecting a switch;

[0042] When it is necessary to cut off the power, it can be done directly from the output of the current transformer, thereby achieving remote control and reducing voltage loss on the line.

[0043] This utility model is reasonably designed, low in cost, sturdy and durable, safe and reliable, simple to operate, time-saving and labor-saving, cost-saving, compact in structure and easy to use. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the cabinet structure of this utility model.

[0045] Figure 2 This is a schematic diagram of the circuit principle embodiment 1 of this utility model.

[0046] Figure 3 This is a schematic diagram of embodiment 2 of the circuit principle of this utility model.

[0047] Figure 4 This is a schematic diagram of the selection switch circuit of this utility model.

[0048] The components include: 1. Cabinet; 2. Door panel; 3. Side pressure bar; 4. Current transformer; 5. Rectifier; 6. Energy storage device; 7. Switching circuit; 8. Meter; 9. Concentrator; 10. Remote terminal; 11. Battery pack A; 12. Battery pack B; 13. Inverter; 14. Hinge; 15. Normally closed switch; 16. Controller; 17. Communication module; 18. Selector switch; 19. Relay. Detailed Implementation

[0049] like Figure 1-4 ,like Figure 1As shown, the dedicated power supply for the meter in this embodiment includes a cabinet 1; a current transformer 4 connected to AC power is installed in the cabinet 1, which draws power from the low-voltage side, ensuring safety and reliability, and can be a current transformer or a voltage transformer; the current transformer 4 is electrically connected to the input terminal of a rectifier 5 and an input terminal of a switching circuit 7, thereby realizing charging, energy storage, and circuit control. As a priority, when an external power supply is available, external power supply is preferred.

[0050] As a basic circuit, rectifier 5 is electrically connected to energy storage device 6;

[0051] The energy storage device 6 includes independently powered battery packs A11 and B12;

[0052] The voltage of battery pack A11 is higher than that of battery pack B12; thus providing the high voltage required for starting loads such as motors.

[0053] The charging capacity of battery pack A11 is lower than that of battery pack B12; thus meeting the needs of motors and other devices for long-term operation.

[0054] Battery packs A11 and B12 are each electrically connected to inverter 13; as a basic circuit, they realize DC to AC conversion.

[0055] Inverter 13 is electrically connected to the other input terminal of switching circuit 7; switching circuit 7 is electrically connected to meter 8 and concentrator 9, the above is the basic conventional connection.

[0056] The concentrator 9 collects data from the meter 8 and uploads it to the remote terminal 10, realizing data transmission; this is a conventional circuit. The output of the selector switch 18 is electrically connected to the inverter 13; the inverter 13 is electrically connected to the switching circuit 7, thereby realizing dual power supply and better saving energy.

[0057] To increase the driving range, the output terminal of battery pack B12 is electrically connected to battery pack A11 via diode D3; as a standard accessory, energy storage device 6 is electrically connected to battery management system (BMS).

[0058] Battery pack A11 is electrically connected to controller 16 and communication module 17 via normally closed switch 15; Figure 1 , 2 Both batteries can be used to wake up the controller, but battery pack A1 is more effective and economical. Controller 16 is electrically connected to remote terminal 10 via communication module 17.

[0059] The controller 16 is electrically connected to the relay 19 at the output of the current transformer 4; the output of the relay 19 is electrically connected to the input of the rectifier 5 and an input of the switching circuit 7. The controller 16 is configured using a PLC or MCU in conjunction with a driver.

[0060] The controller 16 is electrically connected to the selection switch 18, which is used to switch between battery pack A11 and battery pack B12. It can be PLC + relay mode or through op amplifier, with the reference point set in the MCU to realize the on and off, or the reference voltage can be set by MOSG.

[0061] To reduce costs, this invention employs a transistor design. The selection switch 18, including transistor Q1, resistors RZ1, R2, and R3, is adjusted via a voltage divider resistor based on the reference voltage at its base. A Zener diode DZ3 provides high-voltage power; as the voltage decays to a set value, VCC1 is powered. Preferably, a relay KX2 is included in the power supply circuit of the Zener diode DZ3 to cut off VCC1 when it is powered. Cutting off can be achieved through control coil control or other methods. The control coil can be located in the VCC1 path to achieve normally closed switching, which will not be elaborated further.

[0062] In order to turn on VCC1, the output terminal VCC1 of battery pack A11 is split into two paths after passing through resistor R3. One path is grounded through resistor RZ1, and the other path is connected to the base of transistor Q1.

[0063] The output terminal VCC2 of battery pack B12 is connected to the collector of transistor Q1;

[0064] The emitter of transistor Q1 is electrically connected to the input terminal of switching circuit 7 through resistor R2;

[0065] The output terminal VCC2 is electrically connected to the input terminal of inverter 13 through the Zener diode DZ3.

[0066] To prevent theft, hinges 14 are provided on cabinet 1 to connect to door panel 2;

[0067] A side pressure bar 3 is provided on the door panel 2;

[0068] Side pressure bar 3 is installed on the movable page of hinge 14;

[0069] A normally closed switch 15 is installed in cabinet 1;

[0070] When cabinet 1 is closed, the side pressure rod 3 presses against the normally closed switch 15, causing the normally closed switch 15 to open; the controller 16 stops working on this channel.

[0071] When cabinet 1 is opened, the side pressure rod 3 releases the normally closed switch 15, causing the normally closed switch 15 to close. The controller 16 receives the signal on this channel and generates a work log. The backend can contact the local person in charge to understand the actual situation. Cameras can also be installed in the cabinet for remote identification, but this is costly. Of course, conventional security and anti-theft circuit devices such as alarms can also be installed on its lines.

[0072] Switching circuit 7 is a manual switch switching circuit or an automatic switching circuit.

[0073] The energy storage device 6 is electrically connected to a photovoltaic panel.

[0074] It should be noted that the normally closed switch 15 marked with the anti-theft price on controller 16 does not mean that there are no other circuits electrically connected to battery pack A.

[0075] Under normal circumstances, after the transformer passes through the current transformer 4, it charges the two battery packs of the energy storage device 6 through the rectifier 5, and the switching circuit 7 switches to select the power supply.

[0076] When the transformer is not supplying power or is undervoltage, battery pack B12 is powered by diode DZ3. Power is supplied via time or voltage control; that is, after a set time or voltage reference is established, battery pack B12 stops supplying power, and transistor Q1 turns on battery pack A11 to supply power. The reference voltage is adjusted via adjustable resistor RZ1. KX2 can be a time switch or a relay switch, etc.

[0077] When battery pack A11 is low on power, battery pack B12 temporarily replenishes the power of battery pack A11.

[0078] This utility model is described in detail for the purpose of making the disclosure clearer, and the prior art will not be listed one by one.

[0079] As an application, the device provides power supply methods: low-voltage side power supply and solar panel power supply, and is equipped with a dual power supply switching switch.

[0080] 1) When the power is drawn from the low-voltage side, lithium batteries or other batteries are configured to provide a stable power supply for the concentrator and meters in the uninterruptible power supply mode, preventing data acquisition failures caused by power supply problems. There are no high-voltage components, which is relatively safe. The power supply can be switched, and the problem of intermittent power outages is also solved (for example, after user 1 finishes using the power, the furrow replacement and handover can be completed in 5 minutes to continue irrigation).

[0081] 2) Powered by solar panels, and equipped with lithium batteries or other batteries, it provides a stable power supply to the concentrator and meters in an uninterruptible power supply mode. It provides a continuous and stable power supply during non-agricultural drainage periods, solving the problem that the concentrator or metering device cannot collect data during seasonal changes, and saving the trouble of frequently changing the background parameters.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. It is obvious to those skilled in the art that multiple technical solutions of this utility model can be combined. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model. All technical contents not described in detail in this utility model are publicly known technologies.

Claims

1. A dedicated power supply for meters, characterized in that: Includes a cabinet (1); a current transformer (4) connected to AC power is installed in the cabinet (1); the current transformer (4) is electrically connected to the input terminal of the rectifier (5) and an input terminal of the switching circuit (7); The rectifier (5) is electrically connected to the energy storage device (6); The energy storage device (6) includes independently powered battery pack A (11) and battery pack B (12); The voltage of battery pack A (11) is higher than the voltage of battery pack B (12); The charging capacity of battery pack A (11) is lower than that of battery pack B (12); Battery pack A (11) and battery pack B (12) are electrically connected to inverters (13); The inverter (13) is electrically connected to the other input terminal of the switching circuit (7); The switching circuit (7) is electrically connected to a meter (8) and a concentrator (9).

2. The dedicated power supply for meters according to claim 1, characterized in that: The current transformer (4) is connected to the low-voltage side of the transformer; The transformer (4) includes a current transformer or a voltage transformer; The concentrator (9) collects data from the meter (8) and uploads it to the remote end (10).

3. The dedicated power supply for meters according to claim 2, characterized in that: The output of the selector switch (18) is electrically connected to the inverter (13); the inverter (13) is electrically connected to the switching circuit (7).

4. The dedicated power supply for meters according to claim 3, characterized in that: One output terminal of battery pack B(12) is electrically connected to battery pack A(11) through diode D3; The energy storage device (6) is electrically connected to the battery management system (BMS); Battery pack A (11) is electrically connected to controller (16) and communication module (17) via normally closed switch (15); The controller (16) is electrically connected to the remote end (10) via the communication module (17).

5. The dedicated power supply for meters according to claim 4, characterized in that: The controller (16) is electrically connected to the relay (19) at the output of the transformer (4); the output of the relay (19) is electrically connected to the input of the rectifier (5) and an input of the switching circuit (7).

6. The dedicated power supply for meters according to claim 5, characterized in that: The controller (16) is electrically connected to the selection switch (18) for switching between battery pack A (11) or battery pack B (12).

7. The dedicated power supply for meters according to claim 5, characterized in that: The selector switch (18) includes transistor Q1, resistors RZ1, R2, and R3; and Zener diode DZ3; The output terminal VCC1 of battery pack A(11) is split into two paths after passing through resistor R3. One path is grounded through resistor RZ1, and the other path is connected to the base of transistor Q1. The output terminal VCC2 of battery pack B(12) is connected to the collector of transistor Q1; The emitter of transistor Q1 is electrically connected to the input terminal of inverter (13) through resistor R2; The output terminal VCC2 is electrically connected to the input terminal of the inverter (13) through the Zener diode DZ3.

8. The dedicated power supply for meters according to claim 5, characterized in that: Hinges (14) are provided on the cabinet (1) to connect to the door panel (2); A side pressure bar (3) is provided on the door panel (2); The side pressure bar (3) is set on the movable page of the hinge (14); A normally closed switch (15) is installed in the cabinet (1); When the cabinet (1) is closed, the side pressure rod (3) presses against the normally closed switch (15), causing the normally closed switch (15) to open. When the cabinet (1) is opened, the side pressure rod (3) releases the normally closed switch (15), causing the normally closed switch (15) to close.

9. The dedicated power supply for meters according to claim 5, characterized in that: The switching circuit (7) is a manual switch switching circuit or an automatic switching circuit.

10. The dedicated power supply for meters according to claim 5, characterized in that: The energy storage device (6) is electrically connected to a photovoltaic panel.

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