CN220254176U - Metering power supply circuit and energy metering terminal - Google Patents

Abstract

The application provides a measurement power supply circuit and energy metering terminal, relates to power supply circuit technical field. The metering power supply circuit comprises: a first voltage conversion unit, a second voltage conversion unit, and a battery unit; the input end of the first voltage conversion unit is used for being connected with the output end of the power module in the energy metering terminal; the output end of the first voltage conversion unit is connected with the first input end of the second voltage conversion unit; the second input end of the second voltage conversion unit is connected with the battery unit; the output end of the second voltage conversion unit is used for being connected with a power supply pin of a metering processor in the energy metering terminal. By adopting the metering power supply circuit, when the power supply module of the energy metering terminal is powered off, the electric energy stored in the metering power supply circuit can be used for supplying power to the metering processor, so that the built-in real-time clock unit of the metering processor can still keep a working state when the power supply module is powered off.

Description

Metering power supply circuit and energy metering terminal

Technical Field

The application relates to the technical field of power supply circuits, in particular to a metering power supply circuit and an energy metering terminal.

Background

The clock chip has an important function in the energy metering terminal, the accuracy of metering data in the energy metering terminal is directly affected, and under the condition that the energy metering terminal is powered off, the clock chip needs to keep a working state, and real-time clock data are provided for the next power-on of the energy metering terminal.

The clock chips in the existing energy metering terminal are independently arranged in the energy metering terminal, and if the accuracy of the independently arranged clock chips needs to be ensured, the clock chips need to be screened in advance, so that the energy metering terminal is not suitable for mass production; the other is a built-in real-time clock unit in a metering processor using an energy metering terminal, but the existing energy metering terminal is not provided with a metering power supply circuit specially used for supplying power to the metering processor, and when a power supply module is powered off, the metering processor is powered off, so that the built-in real-time clock unit of the metering processor cannot be ensured to keep a working state.

Disclosure of Invention

The utility model aims to provide a measurement power supply circuit and energy metering terminal to solve among the prior art when the measurement treater loses electricity, the problem that can't guarantee that the built-in real-time clock unit of measurement treater keeps operating condition.

In order to achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

in a first aspect, embodiments of the present application provide a metering power supply circuit, including: a first voltage conversion unit, a second voltage conversion unit, and a battery unit;

the input end of the first voltage conversion unit is used for being connected with the output end of the power supply module in the energy metering terminal; the output end of the first voltage conversion unit is connected with the first input end of the second voltage conversion unit; the second input end of the second voltage conversion unit is connected with the battery unit;

and the output end of the second voltage conversion unit is used for being connected with a power supply pin of a metering processor in the energy metering terminal.

In an embodiment, the first voltage conversion unit includes: a common mode choke, a first voltage regulator, and a first capacitor;

the first wiring end of the common mode choke coil is an input end of the first voltage conversion unit and is used for being connected with an output end of the power supply module, the second wiring end and the third wiring end of the common mode choke coil are grounded, and the fourth wiring end of the common mode choke coil is connected with an input pin of the first voltage stabilizer;

the grounding pin of the first voltage stabilizer is grounded, the output pin of the first voltage stabilizer is connected with one end of the first capacitor, the other end of the first capacitor is grounded, and one end of the first capacitor is the output end of the first voltage conversion unit.

In an embodiment, the first voltage conversion unit further includes: the input pin of the first voltage stabilizer is grounded through the second capacitor, and the output pin of the first voltage stabilizer is grounded through the third capacitor.

In an embodiment, the first voltage conversion unit further includes: the other end of the first capacitor is connected with one end of the first resistor, and the other end of the first resistor is grounded.

In an embodiment, the first voltage conversion unit further includes: the anode of the first diode is grounded, and the cathode of the first diode is connected with the other end of the first capacitor.

In an embodiment, the first voltage conversion unit further includes: and the second terminal of the common mode choke is connected with the third coil of the common mode choke through the third resistor.

In an embodiment, the second voltage conversion unit includes: a second diode, a third diode, and a second voltage regulator; the anode of the second diode is a first input end of the second voltage conversion unit and is used for being connected with the output end of the first voltage conversion unit, and the cathode of the second diode is connected with the input pin of the second voltage stabilizer;

the anode of the third diode is a second input end of the second voltage conversion unit and is used for being connected with the battery unit, and the cathode of the third diode is also connected with an input pin of the second voltage stabilizer;

the grounding pin and the empty pin of the second voltage stabilizer are grounded, and the output pin of the second voltage stabilizer is the output end of the second voltage conversion unit.

In an embodiment, the second voltage conversion unit further includes: a fourth resistor; and an input pin of the second voltage stabilizer is connected with an enabling pin of the second voltage stabilizer through the fourth resistor.

In an embodiment, the second voltage conversion unit further includes: a fourth capacitor and a fifth capacitor; the input pin of the second voltage stabilizer is grounded through the fourth capacitor, and the output pin of the second voltage stabilizer is grounded through the fifth capacitor.

In a second aspect, embodiments of the present application provide an energy metering terminal, the energy metering terminal including: the metering power supply circuit comprises a power supply module, a metering processor, a memory and the metering power supply circuit in the embodiment;

the output end of the power supply module is connected with the input end of a first voltage conversion unit in the metering power supply circuit, the output end of a second voltage conversion unit in the metering power supply circuit is connected with a power supply pin of the metering processor, and a communication pin of the metering processor is connected with the memory.

The beneficial effects of this application are: the application provides a measurement power supply circuit and energy metering terminal, this measurement power supply circuit includes: a first voltage conversion unit, a second voltage conversion unit, and a battery unit; the input end of the first voltage conversion unit is used for being connected with the output end of the power module in the energy metering terminal; the output end of the first voltage conversion unit is connected with the first input end of the second voltage conversion unit; the second input end of the second voltage conversion unit is connected with the battery unit; the output end of the second voltage conversion unit is used for being connected with a power supply pin of a metering processor in the energy metering terminal. By adopting the metering power supply circuit, when the power supply module of the energy metering terminal is powered off, the electric energy stored in the metering power supply circuit can be used for supplying power to the metering processor, so that the built-in real-time clock unit of the metering processor can still keep a working state when the power supply module is powered off.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a metering power supply circuit according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a first voltage converting unit according to an embodiment of the present disclosure;

FIG. 3 is a second schematic diagram of a first voltage converting unit according to an embodiment of the present disclosure;

FIG. 4 is a third schematic diagram of a first voltage converting unit according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a first voltage converting unit according to an embodiment of the present disclosure;

FIG. 6 is a fifth schematic diagram of a first voltage converting unit according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a second voltage converting unit according to an embodiment of the present disclosure;

FIG. 8 is a second schematic diagram of a second voltage converting unit according to an embodiment of the present disclosure;

FIG. 9 is a third schematic diagram of a second voltage converting unit according to an embodiment of the present disclosure;

FIG. 10 is a schematic circuit diagram of a metering power supply circuit according to an embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of an energy metering terminal according to an embodiment of the present application.

Reference numerals illustrate: 1. a first voltage conversion unit; 2. a second voltage conversion unit; 3. a battery unit; 11. a common mode choke; 12. a first voltage regulator; 13. a first capacitor; 14. a second capacitor; 15. a third capacitor; 16. a first resistor; 17. a first diode; 18. a second resistor; 19. a third resistor; 21. a second diode; 22. a third diode; 23. a second voltage stabilizer; 24. a fourth resistor; 25. a fourth capacitor; 26. a fifth capacitor; 4. a power module; 5. a metering processor; 6. a memory.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments.

Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

In the description of the present application, it should be noted that, if the terms "upper", "lower", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or an azimuth or the positional relationship that is commonly put when the product of the application is used, it is merely for convenience of description and simplification of the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application.

Furthermore, the terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, directly connected, indirectly connected through an intermediary, or communicating between two elements. The specific meaning of the terms in the present application can be understood by those skilled in the art according to the specific circumstances.

It should be noted that, without conflict, features in embodiments of the present application may be combined with each other.

The clock chip has an important function in the energy metering terminal, is used for providing real-time clock data for the energy metering terminal, directly influences the accuracy of metering data in the energy metering terminal, and needs to keep a working state under the condition that the energy metering terminal is powered off, and provides the real-time clock data for the next power-on of the energy metering terminal. Therefore, even if the power supply of the energy metering terminal is lost, the clock chip needs to be kept in an operating state, that is, it needs to be ensured that the clock chip is not lost.

In the prior art, a clock chip is usually arranged in an energy metering terminal independently, but if the precision of the independently arranged clock chip needs to be ensured, the clock chip needs to be screened in advance, so that the energy metering terminal is not suitable for mass production; therefore, another assumption is put forward, because the energy metering terminals are all provided with metering processors, and the metering processors are internally provided with real-time clock units, real-time clock data can be provided for the energy metering terminals through the real-time clock units which are internally arranged in the metering processors of the energy metering terminals, but the existing energy metering terminals are not independently provided with metering power supply circuits which are specially used for supplying power to the metering processors, and the metering processors are powered by adopting power supply modules which are externally connected with the energy metering terminals, when the power supply modules are powered off, the metering processors lose power, and the real-time clock units which are internally arranged in the metering processors cannot be guaranteed to keep working states. Therefore, there is a need for a metering power supply circuit that is capable of powering a metering processor in an energy metering terminal when a power module is de-energized.

The metering power supply circuit provided in the present application is specifically illustrated by a plurality of examples in conjunction with the accompanying drawings.

Fig. 1 is a schematic structural diagram of a metering power supply circuit according to an embodiment of the present application. As shown in fig. 1, the metering power supply circuit includes: a first voltage conversion unit 1, a second voltage conversion unit 2, and a battery unit 3.

Specifically, the input end of the first voltage conversion unit 1 is connected with the output end of a power supply module in the energy metering terminal, the power supply module in the energy metering terminal can be an external alternating current power supply, the power supply module can supply power for the first voltage conversion unit 1, and the first voltage conversion unit 1 can store a part of electric energy provided by the power supply module; the output end of the first voltage conversion unit 1 is connected with the first input end of the second voltage conversion unit 2, so that the electric energy received from the power supply module can be transmitted to the second voltage conversion unit 2, and the second voltage conversion unit 2 can store part of the electric energy provided by the first voltage conversion unit 1; the second input end of the second voltage conversion unit 2 is connected with the battery unit 3, the battery unit 3 can be, for example, an energy storage battery of any model, and the battery unit 3 can provide additional electric energy for the second voltage conversion unit 2 on the basis that the first voltage conversion unit 1 supplies power for the second voltage conversion unit 2; the output of the second voltage converting unit 2 is used for connecting to a power supply pin of a metering processor in the energy metering terminal, based on which connection the second voltage converting unit 2 can supply power to the metering processor in the energy metering terminal.

In actual operation, since the first voltage conversion unit 1 and the second voltage conversion unit 2 in the metering power supply circuit provided in this embodiment can both store electric energy, when the power supply module in the energy metering terminal is powered off, the metering processor can be powered by the first voltage conversion unit 1, the second voltage conversion unit 2 and the battery unit 3, specifically: when a power supply module in the energy metering terminal is powered off, the electric energy stored in the first voltage conversion unit 1 is used for supplying power to the second voltage conversion unit 2 and the metering processor, and at the moment, the electric energy stored in the second voltage conversion unit 2 is not used; when the first voltage converting unit 1 is de-energized, the metering processor is powered with the electrical energy stored in the second voltage converting unit 2 and the battery unit 3.

In summary, the present embodiment provides a metering power supply circuit, including: the battery comprises a first voltage conversion unit, a second voltage conversion unit and a battery unit. The input end of the first voltage conversion unit is used for being connected with the output end of the power module in the energy metering terminal; the output end of the first voltage conversion unit is connected with the first input end of the second voltage conversion unit; the second input end of the second voltage conversion unit is connected with the battery unit; the output end of the second voltage conversion unit is used for being connected with a power supply pin of a metering processor in the energy metering terminal. By adopting the metering power supply circuit of the embodiment, when the power supply module of the energy metering terminal is in power failure, the first voltage conversion unit, the second voltage conversion unit and the electric energy stored in the battery unit of the metering power supply circuit can be used for supplying power to the metering processor, so that the real-time clock unit built in the metering processor can still keep a working state when the power supply module is in power failure.

An embodiment of the present application provides a possible implementation manner of the first voltage converting unit, and fig. 2 is one of schematic structural diagrams of the first voltage converting unit provided in an embodiment of the present application. As shown in fig. 2, the first voltage converting unit 1 includes: a common mode choke 11, a first voltage regulator 12, and a first capacitor 13.

The common mode choke 11 is also called a common mode inductor, and is used for filtering electromagnetic interference signals of a common mode; the first voltage stabilizer 12 is a voltage stabilizer of any model, as long as the output voltage of the power supply module can be controlled within a certain range; the first capacitor 13 may be, for example, a faraday capacitor, and the maximum power storage capacity may reach several thousand farads, and in this embodiment, the first voltage conversion unit 1 may store a portion of the electric energy provided by the power module, which means that when the power module is powered on, the first capacitor 13 stores a portion of the electric energy provided by the power module, and when the power module is powered off, the first capacitor 13 may use the stored electric energy to supply power to the second voltage conversion unit 2, and the number of the first capacitors 13 may be one or more than one arbitrary number, and the more the number is, the more the stored electric energy is.

In the present embodiment, the common mode choke 11 has 4 terminals in total: the first terminal of the common mode choke 11 is an input end of the first voltage converting unit 1 and is used for being connected with an output end of the power module, the second terminal and the third terminal of the common mode choke 11 are grounded, the fourth terminal of the common mode choke 11 is connected with an input pin of the first voltage stabilizer 12, and the common mode choke 11 can be used for filtering electromagnetic interference signals of a common mode of the power module and the first voltage converting unit 1; the grounding pin of the first voltage stabilizer 12 is grounded, the output pin of the first voltage stabilizer 12 is connected with one end of the first capacitor 13, and is used for converting the voltage value provided by the power module into the voltage value required by the first capacitor 13, the other end of the first capacitor 13 is grounded, and one end of the first capacitor 13 connected with the output pin of the first voltage stabilizer 12 is the output end of the first voltage conversion unit 1.

Fig. 3 is a second schematic structural diagram of a first voltage converting unit according to an embodiment of the present application, where, as shown in fig. 3, the first voltage converting unit further includes: the input pin of the first voltage regulator 12 is grounded through the second capacitor 14, and the output pin of the first voltage regulator 12 is grounded through the third capacitor 15.

The second capacitor 14 may include an electrolytic capacitor for energy storage, a tile capacitor for decoupling, and a tile capacitor for filtering, and in an actual circuit design, the second capacitor 14 in the first voltage conversion unit 1 may include both an electrolytic capacitor for energy storage, a tile capacitor for decoupling, and a tile capacitor for filtering. The third capacitors 15 include ceramic capacitors for storing energy, and in this embodiment, the number of the third capacitors 15 is not limited, and the number of the third capacitors 15 may be determined according to actual requirements.

Fig. 4 is a third schematic structural diagram of the first voltage converting unit according to an embodiment of the present application, where, as shown in fig. 4, the first voltage converting unit further includes: the other end of the first capacitor 13 is connected with one end of the first resistor 16, and the other end of the first resistor 16 is grounded.

The first resistor 16 is a charging current limiting resistor of the first capacitor 13, and is used for limiting the input current value of the first capacitor 13, so that damage to the first capacitor 13 caused by overlarge current value when the first capacitor 13 is charged can be avoided.

Fig. 5 is a fourth schematic structural diagram of a first voltage conversion unit according to an embodiment of the present application, where, as shown in fig. 5, the first voltage conversion unit further includes: the anode of the first diode 17 is grounded, and the cathode of the first diode 17 is connected with the other end of the first capacitor 13.

The first diode 17 is a discharging freewheeling diode of the first capacitor 13, and is used for placing voltage abrupt changes at two ends of the first capacitor 13 to cause damage to elements in the metering power supply circuit when the first capacitor 13 discharges.

Fig. 6 is a fifth schematic structural diagram of a first voltage conversion unit according to an embodiment of the present application, where, as shown in fig. 6, the first voltage conversion unit further includes: a second resistor 18 and a third resistor 19, wherein a first terminal of the common mode choke 11 is connected to a fourth coil of the common mode choke 11 through the second resistor 18, and a second terminal of the common mode choke 11 is connected to a third coil of the common mode choke 11 through the third resistor 19.

The second resistor 18 and the third resistor 19 are current limiting resistors of the common mode choke 11, and are used for preventing voltage mutation on the common mode choke 11 when the power supply module is in power failure, so that the common mode choke 11 is protected.

Fig. 7 is a schematic structural diagram of a second voltage conversion unit according to an embodiment of the present application, where, as shown in fig. 7, the second voltage conversion unit includes: a second diode 21, a third diode 22 and a second voltage regulator 23.

The second diode 21 and the third diode 22 are diodes capable of preventing reverse current, the anode of the second diode 21 is a first input end of the second voltage conversion unit 2 and is used for being connected with the output end of the first voltage conversion unit 1, the cathode of the second diode 21 is connected with the input pin of the second voltage stabilizer 23, and the second diode 21 can enable the current provided by the first voltage conversion unit 1 to flow into the second voltage conversion unit 2 along the direction from the anode to the cathode of the second diode 21; the anode of the third diode 22 is a second input end of the second voltage conversion unit 2 and is used for being connected with the battery unit 3, the cathode of the third diode 22 is also connected with an input pin of the second voltage stabilizer 23, and the third diode 22 can enable current provided by the battery unit 3 to flow into the second voltage conversion unit 2 along the direction from the anode to the cathode of the third diode 22; the ground pin and the empty pin of the second voltage stabilizer 23 are both grounded, and the output pin of the second voltage stabilizer 23 is the output end of the second voltage conversion unit 2.

The second voltage stabilizer 23 is any voltage stabilizer, as long as the voltage value provided by the first voltage converting unit 1 can be converted into the voltage value required by the second voltage converting unit 2, and in this embodiment, since the second input terminal of the second voltage converting unit 2 is connected to the battery unit 3, the voltage value provided by the battery unit 3 is smaller, so the second voltage stabilizer 23 is preferably a voltage stabilizer model with low static loss, and can avoid electric energy loss.

Fig. 8 is a second schematic diagram of a second voltage conversion unit according to an embodiment of the present application, where, as shown in fig. 8, the second voltage conversion unit further includes: a fourth resistor 24; the input pin of the second voltage regulator 23 is connected to the enable pin of the second voltage regulator 23 via a fourth resistor 24.

The fourth resistor 24 plays a role in protecting the enable pin of the second voltage stabilizer 23, so that damage to the enable pin of the second voltage stabilizer 23 caused by abrupt current change at the instant of power failure of the power supply module in the energy metering terminal can be avoided.

Fig. 9 is a third schematic structural diagram of a second voltage conversion unit according to an embodiment of the present application, where, as shown in fig. 9, the second voltage conversion unit further includes: a fourth capacitor 25 and a fifth capacitor 26; the input pin of the second voltage stabilizer 23 is grounded through a fourth capacitor 25, and the output pin of the second voltage stabilizer 23 is grounded through a fifth capacitor 26.

The fourth capacitor 25 is a ceramic chip capacitor for filtering, and may filter the current that the first voltage converting unit 1 sends to the second voltage converting unit 2, and, similar to the first voltage converting unit 1, the fifth capacitor 26 in the second voltage converting unit 2 may include an electrolytic capacitor for storing energy, a ceramic chip capacitor for decoupling, and a ceramic chip capacitor for filtering, and in an actual circuit design, the second voltage converting unit 2 may include both an electrolytic capacitor for storing energy, a ceramic chip capacitor for decoupling, and a ceramic chip capacitor for filtering.

Fig. 10 is a circuit schematic diagram of a metering power supply circuit according to an embodiment of the present application, as shown in fig. 10, a common mode choke 11 in a first voltage converting unit 1 provided in the foregoing embodiment is a coil L1 in fig. 10, a first voltage stabilizer 12 is N1, a first capacitor 13 is capacitors C1 and C2, a second capacitor 14 is a ceramic capacitor C5 for filtering, an electrolytic capacitor CE1 for storing energy, and a ceramic capacitor C6 for decoupling, a third capacitor 15 is capacitors C3 and C4, a first resistor 16 is a resistor R2, a first diode 17 is VD1, a second resistor 18 is R1, and a third resistor 19 is R3; the second diode 21 in the second voltage conversion unit 2 is VD2, the third diode 22 is VD3, the second voltage stabilizer 23 is N2, the fourth resistor 24 is R4, the fourth capacitor 25 is C7, the fifth capacitor 26 is a ceramic capacitor C9 for filtering, an electrolytic capacitor C10 for storing energy, and a ceramic capacitor C8 for decoupling, and the battery unit 3 is GB1.

In fig. 10, a resistor R1 is connected to the output end of the power module, one end of a capacitor C8 is connected to a power supply pin of the metering processor, and an ungrounded end of the capacitor C4 represents the output end of the first voltage converting unit 1.

On the basis of the metering power supply circuit provided in the foregoing embodiment, an embodiment of the present application further provides an energy metering terminal, and fig. 11 is a schematic structural diagram of the energy metering terminal provided in an embodiment of the present application, as shown in fig. 11, where the energy metering terminal includes: a power module 4, a metering processor 5, a memory 6 and metering power supply circuitry of the above embodiments.

The power module 4 is configured to supply power to the energy metering terminal, for example, may be an external ac power supply configured to supply power to the energy metering terminal, and in this embodiment, an output end of the power module 4 is connected to an input end of the first voltage conversion unit 1 in the metering power supply circuit, and is configured to supply power to the first voltage conversion unit 1; the metering processor 5 is used for metering a value to be measured in the energy metering terminal (if the energy metering terminal is a smart meter, the metering processor 5 is used for metering the electricity consumption of a user), in this embodiment, the output end of the second voltage conversion unit 2 in the metering power supply circuit is connected with a power supply pin of the metering processor 5 and is used for supplying power to the metering processor 5, and it can be understood that, compared with the prior art, in this embodiment, the metering power supply circuit is added between the power supply module 4 and the metering processor 5; the communication pin of the metering processor 5 is connected with the memory 6, so that the metering processor 5 can send the data obtained by metering to the memory 6, and the memory 6 can store the data sent by the metering processor 5.

In this embodiment, a metering power supply circuit is added between the power module 4 and the metering processor 5 of the energy metering terminal, when the power module 4 is powered off, the electric energy stored in the metering power supply circuit can be used for supplying power to the metering processor 5, so that the real-time clock unit built in the metering processor 5 can still keep a working state when the power module 4 is powered off, the metering processor 5 can use the electric energy provided by the metering power supply circuit to send the data obtained by metering to the memory 6, and the data loss caused by the power failure of the power module 4 is avoided.

It should be noted that the energy metering terminal may be, for example, an intelligent electric meter, an intelligent water meter, an intelligent gas meter, or other types of internet of things meters, and the specific type of the energy metering terminal is not limited herein.

The foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A metering power supply circuit, comprising: a first voltage conversion unit, a second voltage conversion unit, and a battery unit;

the input end of the first voltage conversion unit is used for being connected with the output end of the power supply module in the energy metering terminal; the output end of the first voltage conversion unit is connected with the first input end of the second voltage conversion unit; the second input end of the second voltage conversion unit is connected with the battery unit;

and the output end of the second voltage conversion unit is used for being connected with a power supply pin of a metering processor in the energy metering terminal.

2. The metering circuit of claim 1 wherein the first voltage converting unit comprises: a common mode choke, a first voltage regulator, and a first capacitor;

the first wiring end of the common mode choke coil is an input end of the first voltage conversion unit and is used for being connected with an output end of the power supply module, the second wiring end and the third wiring end of the common mode choke coil are grounded, and the fourth wiring end of the common mode choke coil is connected with an input pin of the first voltage stabilizer;

the grounding pin of the first voltage stabilizer is grounded, the output pin of the first voltage stabilizer is connected with one end of the first capacitor, the other end of the first capacitor is grounded, and one end of the first capacitor is the output end of the first voltage conversion unit.

3. The metering circuit of claim 2 wherein the first voltage converting unit further comprises: the input pin of the first voltage stabilizer is grounded through the second capacitor, and the output pin of the first voltage stabilizer is grounded through the third capacitor.

4. The metering circuit of claim 2 wherein the first voltage converting unit further comprises: the other end of the first capacitor is connected with one end of the first resistor, and the other end of the first resistor is grounded.

5. The metering circuit of claim 2 wherein the first voltage converting unit further comprises: the anode of the first diode is grounded, and the cathode of the first diode is connected with the other end of the first capacitor.

6. The metering circuit of claim 2 wherein the first voltage converting unit further comprises: and the second terminal of the common mode choke is connected with the third coil of the common mode choke through the third resistor.

7. The metering circuit of claim 1 wherein the second voltage converting unit comprises: a second diode, a third diode, and a second voltage regulator; the anode of the second diode is a first input end of the second voltage conversion unit and is used for being connected with the output end of the first voltage conversion unit, and the cathode of the second diode is connected with the input pin of the second voltage stabilizer;

the anode of the third diode is a second input end of the second voltage conversion unit and is used for being connected with the battery unit, and the cathode of the third diode is also connected with an input pin of the second voltage stabilizer;

the grounding pin and the empty pin of the second voltage stabilizer are grounded, and the output pin of the second voltage stabilizer is the output end of the second voltage conversion unit.

8. The metering circuit of claim 7 wherein the second voltage converting unit further comprises: a fourth resistor; and an input pin of the second voltage stabilizer is connected with an enabling pin of the second voltage stabilizer through the fourth resistor.

9. The metering circuit of claim 7 wherein the second voltage converting unit further comprises: a fourth capacitor and a fifth capacitor; the input pin of the second voltage stabilizer is grounded through the fourth capacitor, and the output pin of the second voltage stabilizer is grounded through the fifth capacitor.

10. An energy metering terminal, characterized in that the energy metering terminal comprises: a power module, a metering processor, a memory and a metering power supply circuit as claimed in any one of claims 1 to 9;

the output end of the power supply module is connected with the input end of a first voltage conversion unit in the metering power supply circuit, the output end of a second voltage conversion unit in the metering power supply circuit is connected with a power supply pin of the metering processor, and a communication pin of the metering processor is connected with the memory.