CN217543237U - Power consumption metering circuit and charging metering system - Google Patents
Power consumption metering circuit and charging metering system Download PDFInfo
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- CN217543237U CN217543237U CN202220912188.7U CN202220912188U CN217543237U CN 217543237 U CN217543237 U CN 217543237U CN 202220912188 U CN202220912188 U CN 202220912188U CN 217543237 U CN217543237 U CN 217543237U
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Abstract
The utility model provides an electricity consumption measurement circuit and measurement system that charges relates to the electric energy measurement field, include: the device comprises an electric energy metering chip, a multi-path current sampling unit, a voltage sampling unit and a control unit; the input end of the multi-path current sampling unit is respectively connected with the charging output ends of the plurality of charging devices so as to respectively sample output current signals of the plurality of charging output ends; the output end of the multi-path current sampling unit is connected with a plurality of current input interfaces of the electric energy metering chip; the input end of the voltage sampling unit is connected with the alternating current input ends of the plurality of charging devices to sample input voltage signals, and the output end of the voltage sampling unit is connected with the voltage input interface of the electric energy metering chip; and the data communication interface of the electric energy metering chip is connected with the communication interface of the control unit. Adopt the utility model discloses, can charge measurement, release the computational resource of the control unit in coordination to a plurality of battery charging outfits.
Description
Technical Field
The utility model relates to an electric energy measurement field particularly, relates to an electricity metering circuit and charging measurement system.
Background
Fill electric pile and can provide convenient effectual charging service for electric automobile, generally have functions such as electric energy measurement, charging, control.
However, the charging interface of the existing charging pile scheme is limited, and most of the charging piles need to use an ADC sampling unit in the control unit to realize port electric energy metering, so that the external circuit is complex, the metering precision is not high, the charging pile is easily influenced by environmental factors, and the charging experience brought to a user is not good.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an electricity consumption measurement circuit and measurement system that charges can charge the measurement in coordination, release the computational resource of the control unit to a plurality of battery charging outfits.
In a first aspect, the present invention provides an electricity metering circuit, including: the device comprises an electric energy metering chip, a multi-path current sampling unit, a voltage sampling unit and a control unit;
the input end of the multi-path current sampling unit is respectively connected with the charging output ends of a plurality of charging devices so as to respectively sample output current signals of the plurality of charging output ends; the output end of the multi-path current sampling unit is connected with a plurality of current input interfaces of the electric energy metering chip;
the input end of the voltage sampling unit is connected with the alternating current input ends of the plurality of charging devices so as to sample input voltage signals, and the output end of the voltage sampling unit is connected with the voltage input interface of the electric energy metering chip;
and the data communication interface of the electric energy metering chip is connected with the communication interface of the control unit.
Optionally, a zero-crossing detection interface of the electric energy metering chip is connected to a zero-crossing signal input interface of the control unit, so as to perform zero-crossing detection on the voltage sampling unit.
Optionally, an interrupt detection interface of the electric energy metering chip is connected to an interrupt signal input interface of the control unit, so as to perform interrupt protection on the current sampling unit and the voltage sampling unit.
Optionally, the multiple overcurrent detection interfaces of the electric energy metering chip are connected with the multiple overcurrent signal input interfaces of the control unit, so as to perform overcurrent protection on the multiple current input interfaces.
Optionally, the current sampling unit includes: the current transformer and the two paths of current sampling subunits are arranged, wherein the positive input end of the current transformer is connected with the input end of one path of current sampling subunit, and the output end of the one path of current sampling subunit is connected with the positive current input interface of the electric energy metering chip;
and the negative output end of the current transformer is connected with the input end of the other current sampling subunit, and the output end of the other current sampling subunit is connected with the negative current input interface of the electric energy metering chip.
Optionally, the current sampling subunit includes: first resistance, second resistance and first electric capacity, wherein, the one end of first resistance does the input of current sampling subunit, the other end of first resistance does the output of current sampling subunit, the one end of first resistance still passes through second resistance ground connection, the other end of first resistance still passes through first electric capacity ground connection.
Optionally, the voltage sampling unit includes: the voltage transformer, the third resistor, the fourth resistor, the fifth resistor and the second capacitor;
the first end of the primary side of the voltage transformer is connected with a live wire input end in the alternating current input end through the third resistor, the second end of the primary side of the voltage transformer is connected with a zero line input end in the alternating current input end, the first end of the secondary side of the voltage transformer is connected with a positive voltage input interface of the electric energy metering chip through the fourth resistor, the fifth resistor is further connected between the first end and the second end of the secondary side of the voltage transformer, the fifth resistor is further grounded, and the fourth resistor is further grounded through the second capacitor;
and a negative voltage input interface of the electric energy metering chip is grounded.
Optionally, the voltage sampling unit further includes: a filtering unit; and a negative voltage input interface of the electric energy metering chip is grounded through the filtering unit.
Optionally, the communication interface is a universal asynchronous receiver/transmitter interface or a serial peripheral interface.
In a second aspect, the utility model provides a charging metering system, include: the power consumption metering circuit is connected with the plurality of charging devices; the electricity consumption metering circuit is the electricity consumption metering circuit according to any one of the first aspect.
The utility model provides an electricity metering circuit, which comprises an electric energy metering chip, a multi-path current sampling unit, a voltage sampling unit and a control unit; the input end of the multi-path current sampling unit is respectively connected with the charging output ends of the plurality of charging devices so as to respectively sample output current signals of the plurality of charging output ends; the output end of the multi-path current sampling unit is connected with a plurality of current input interfaces of the electric energy metering chip; the input end of the voltage sampling unit is connected with the alternating current input ends of the plurality of charging devices to collect input voltage signals, and the output end of the voltage sampling unit is connected with the voltage input interface of the electric energy metering chip; and the data communication interface of the electric energy metering chip is connected with the communication interface of the control unit. By using the multi-path current sampling unit and one path of voltage sampling unit in cooperation with the electric energy metering chip, multi-port independent metering is realized in the electric energy metering circuit; meanwhile, the sampling unit is isolated from the metering unit, so that the safety and reliability of the circuit are ensured; and because the independent multi-path electricity utilization metering circuit is used, the calculation pressure of the main controller is released, the excessive consumption of resources in the main controller is avoided, and the main controller can use more resources for realizing the control and communication work.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of an electricity consumption metering circuit provided by the present invention;
fig. 2 is a schematic diagram of another electricity metering circuit provided by the present invention;
fig. 3 is a schematic diagram of another electricity metering circuit provided by the present invention;
fig. 4 is a schematic diagram of another electricity metering circuit provided by the present invention;
fig. 5 is a schematic diagram of a current sampling circuit provided by the present invention;
fig. 6 is a schematic diagram of a current sampling subunit provided by the present invention;
fig. 7 is a schematic diagram of a voltage sampling circuit provided by the present invention;
fig. 8 is a schematic diagram of another voltage sampling circuit provided by the present invention;
fig. 9 is a schematic view of a charging metering system provided by the present invention;
fig. 10 is another electricity metering circuit provided by the present invention.
An icon: 1, a power consumption metering circuit; 11, an electric energy metering chip; 12, a current sampling unit; 13, a voltage sampling unit; 14, a control unit; 121, a current sampling subunit; 122, a current transformer; 131, a voltage transformer; 132, a filtering unit; 2, a charging metering system; 21, charging equipment.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Before explaining the present disclosure in detail, an application scenario of the present disclosure will be described.
Driven by modern technological advances and energy and environmental concerns, electric vehicles are not only coming to new opportunities, but also new technical challenges. In the electricity market, in order to ensure that good quality services are provided to the electricity producers and users, fair and fair metering of electricity must be achieved. However, the charging pile for charging the electric vehicle at present has functional limitations, can only realize the charging service of a single port or a double port, and cannot independently charge and meter multiple ports. In addition, in the conventional electric energy metering, an ADC (Analog Digital Converter) sampling circuit inside an MCU (micro controller Unit) is mainly used to collect current flowing through a load and collect voltage, thereby realizing electric energy metering. However, such a sampling method is not only susceptible to measurement deviation caused by heating of the resistor, so that the power error calculated by the MCU is large, but also requires filtering and correction processing after the ADC value is acquired because the sampling method belongs to a nonlinear load for electric vehicles, so that an unprecedented principle is provided for floating point operation of the MCU, so that the MCU has a large consumption of internal resources, and real-time control of external circuits cannot be realized.
Moreover, because the existing charging pile is basically in a uniform shape, and the space inside the charging pile is limited, the traditional electricity metering circuit is dense under the condition of complex wiring, and the subsequent maintenance and detection of the charging pile are challenged.
Based on this, the utility model provides an electricity consumption measurement circuit and measurement system that charges for multichannel current sampling unit can carry out the current acquisition to a plurality of battery charging outfit respectively, and the voltage signal of voltage sampling unit to sampling is reunited, carries out the electric energy measurement and sends data to the control unit through communication interface through the electric energy measurement chip, thereby realizes the independent electric energy measurement of multichannel, releases the control unit's resource, ensures the precision of electric energy measurement.
The following description is made by way of example with reference to the accompanying drawings. Fig. 1 is a schematic diagram of a power consumption metering circuit provided by the present invention. As shown in fig. 1, the electricity consumption metering circuit 1 includes: the device comprises an electric energy metering chip 11, a multi-path current sampling unit 12, a voltage sampling unit 13 and a control unit 14.
The input end of the multi-path current sampling unit 12 is respectively connected with the charging output ends of a plurality of charging devices to respectively sample the output current signals of the plurality of charging output ends, wherein one path of current sampling unit 12 corresponds to one charging device and carries out current sampling on one charging device.
The output end of the multi-path current sampling unit 12 is connected to a plurality of current input interfaces of the electric energy metering chip 11, in this embodiment, the number of the current sampling units 12 is completely based on the number of current channels of the electric energy metering chip 11, and if the electric energy metering chip 11 leaves the factory and sets N current channels, the current sampling unit 12 in this embodiment is at most N paths.
The input end of the voltage sampling unit 13 is connected to the ac input ends of the plurality of charging devices to collect input voltage signals. In this embodiment, the voltage sampling unit 13 is 1-way, and can be directly connected to a 220V low-voltage power grid, so as to collect ac voltage signals for supplying power to a plurality of charging devices. The output end of the voltage sampling unit 13 is connected with the voltage input interface of the electric energy metering chip 11; the data communication interface of the electric energy metering chip 11 is connected with the communication interface of the control unit 14, and the electric energy metering chip 11 can perform data transmission with the control unit 14 through communication.
Optionally, the communication Interface of the electric energy metering chip 11 is a Universal Asynchronous Receiver/Transmitter (UART) or a Serial Peripheral Interface (SPI). Specifically, in a possible implementation manner, the communication interface of the power metering chip 11 may be an SPI/UART interface, and the communication manner may be selected through a function selection pin SEL (Select), where SEL =1 is used to Select the SPI communication manner, and SEL =0 is used to Select the UART communication manner. When communication transmission is performed, the communication sending interface of the electric energy metering chip 11 is connected with the communication receiving interface of the control unit 14, and the communication receiving interface of the electric energy metering chip 11 is connected with the communication sending interface of the control unit 14, so that the communication transmission between the electric energy metering chip 11 and the control unit 14 is realized.
Optionally, the control Unit 14 is a Micro Controller Unit (MCU), for example, an STM 32-series single chip microcomputer is adopted, which is not limited in this application. Through arranging MCU in the utility model provides an in the power consumption measurement circuit 1, can release the inside DSP function of MCU for MCU is absorbed in and is controlled and communication. Alternatively, the control unit 14 may transmit the data collected in real time to a charging system in real time through an IOT (Internet of Things) control technology, so as to implement remote monitoring and metering of the electric energy.
The electric energy metering is a main function realized by the electric energy metering circuit, and the accuracy of the electric energy metering directly influences the charging cost of a user. Therefore, in this embodiment, directly use electric energy metering chip 11 to replace traditional electric energy meter or complicated circuit wiring to carry out the electric energy measurement, electric energy metering chip 11 has a plurality of input ports, can provide a plurality of independent electric energy metering channel to a plurality of battery charging outfits, realizes charging in coordination of a plurality of battery charging outfits, has saved the design cost who fills electric pile greatly. Meanwhile, the electric energy metering chip 11 can be used for directly metering the electric energy signal, so that the resource consumption of the control unit 14 is greatly reduced, and more resources are used for realizing the control or communication work by the control unit 14. In this embodiment, the electric energy metering chip 11 is a metering chip having a plurality of current channels and 1 voltage channel, and may be BL0906, BL0910, and ADE7816, which is not limited in this application. Alternatively, if BL0906 or ADE7816 is used, there may be 6 current channels and 1 voltage channel; if BL0910 is used, it can have 10 current channels and 1 voltage channel. Moreover, a plurality of registers are built in the electric energy metering chip 11, each circuit current channel can correspond to one register for electric energy metering, and each register has a unique address.
In this embodiment, the number of the current sampling units 12 is N, and current sampling can be performed on N charging devices at the same time; the number of the voltage sampling units 13 is 1, and voltage sampling can be realized by sampling the ac input terminals that supply power to a plurality of charging devices. The electric energy value measured by each current channel can be obtained by multiplying each sampled current by the common voltage.
Meanwhile, the control unit 14 may control and communicate the electric energy metering chip. When the electric energy of the charging device needs to be measured, the control unit 14 sends a command byte to the electric energy measuring chip 11 first, so that the electric energy measuring chip 11 is in a communication mode read operation, which indicates that the next data transmission operation is read, and then sends an address of a register needing to be read and measured to the electric energy measuring chip 11, because one register for measuring electric energy corresponds to one current sampling circuit, based on the address of the register, the data byte in the electric energy measuring chip 11 can send data bytes in the corresponding register to the control unit 14 in sequence, wherein the data byte in each register represents the electric energy collected by the charging device corresponding to the current sampling circuit, and thus, the independent measurement of the electric energy of a plurality of charging devices is realized.
Alternatively, if the communication interface of the power metering chip 11 is a UART interface or an interface capable of implementing a UART function, the control unit 14 may send a command byte (0 x 35) to the power metering chip 11, so that the power metering chip 11 is in a communication mode read operation, then send an address byte of a register to be read, and then the power metering chip 11 may send a data byte in the corresponding register to the control unit 14.
Optionally, if the communication interface of the electric energy metering chip 11 is an SPI interface or an interface capable of implementing an SPI function, the control unit 14 may send a command byte (0 x 82) to the electric energy metering chip 11, so that the electric energy metering chip 11 is in a communication mode read operation, and then send an address byte of a register to be read, so that the electric energy metering chip 11 shifts out data in a corresponding register when a serial clock rises, and sends a data byte in the corresponding register to the control unit 14.
In the embodiment, the multi-channel current sampling units are used, and one channel of voltage sampling unit is matched with the electric energy metering chip, so that the multi-port independent metering is realized in the electric energy metering circuit; meanwhile, the sampling unit is isolated from the metering, so that the safety and the reliability of the circuit are ensured; and because the independent multi-path electricity utilization metering circuit is used, the calculation pressure of the main controller is released, the excessive consumption of resources in the main controller is avoided, and the main controller can realize more resources for control and communication.
On the basis of the above-mentioned electricity metering circuit that fig. 1 provided, the utility model provides an electric energy metering chip can also provide extra technological effect. Fig. 2 is a schematic diagram of another electricity consumption metering circuit provided by the present invention. As shown in fig. 2, a zero-crossing detection interface of the power metering chip 11 is connected to a zero-crossing signal input interface of the control unit 14, so as to perform zero-crossing detection on the voltage sampling unit 13.
The zero-crossing detection refers to detection performed when a waveform is converted from a positive half cycle to a negative half cycle in an alternating current system and passes through zero, and interference of power grid harmonics can be reduced as much as possible through the zero-crossing detection. Specifically, for the control unit 14, any general purpose input/output interface (GPIO) port may be configured by software as a zero-crossing signal input interface, so as to perform zero-crossing detection on the voltage sampled by the voltage sampling unit 13. The zero-crossing detection interface of the electric energy metering chip 11 can provide zero-crossing detection of the access voltage. Specifically, the zero-crossing signal may be directly output by the zero-crossing detection interface, and when the zero-crossing detection output high level is a negative half cycle of the waveform, the zero-crossing detection output low level is a positive half cycle of the waveform. Optionally, the control unit 14 may receive the zero-crossing signal sent by the electric energy metering chip 11 through the zero-crossing signal input interface, so that the control unit 14 may turn off the relay at the zero-crossing point, thereby reducing the adhesion phenomenon of the relay.
In this embodiment, the zero-crossing detection of the voltage sampled by the voltage sampling unit is realized through the zero-crossing detection interface of the electric energy metering chip 11, and the control unit can be assisted to perform corresponding control by transmitting the zero-crossing signal to the control unit.
On the basis of the above-mentioned electricity metering circuit that fig. 1 provided, the utility model provides an electric energy metering chip can also provide extra technological effect. Fig. 3 is a schematic diagram of another electricity metering circuit provided by the present invention. As shown in fig. 3, the interrupt detection interface of the electric energy metering chip 11 is connected to the interrupt signal input interface of the control unit, so as to perform interrupt protection on the current sampling unit and the voltage sampling unit.
The interrupt protection may prompt the control unit 14 to perform corresponding control by outputting an interrupt signal of a high/low level when the current sampled by the current sampling unit 12 or the voltage sampled by the voltage sampling unit 13 in the electric energy metering chip 11 is abnormal, such as zero-crossing timeout or peak-value timeout occurs. Specifically, for the control unit 14, any general purpose input/output interface (GPIO) port may be configured with software as an interrupt signal input interface, so that the current sampling unit 12 and the voltage sampling unit 13 perform interrupt protection. Alternatively, the threshold values of the current effective value and the voltage finite value may be set in advance, respectively. If the limitation of the current sampled by the first path of current sampling unit is larger than the threshold value of the current peak value, giving a current overload indication 01 of the path, and enabling the interrupt detection interface to output a low level; similarly, if the limit of the current sampled by the second current sampling unit is greater than the threshold value of the current, giving an overload indication 02 of the current, and enabling the interrupt detection interface to output a low level; similarly, if the effective value of the voltage sampled by the voltage sampling unit is greater than the threshold value of the voltage, a voltage overload indication is given, and the interrupt detection interface is enabled to output a low level. Alternatively, in the case where the power metering chip 11 detects the zero-crossing timeout, the interrupt detection interface may be set to output a low level to notify the control unit 14 that the zero-crossing timeout has occurred.
In this embodiment, the interrupt protection of the voltage sampled by the voltage sampling unit and the current sampled by the current sampling unit is implemented through the interrupt detection interface of the electric energy metering chip 11, and the control unit can be assisted to perform corresponding control by transmitting an interrupt signal to the control unit.
On the basis of the above-mentioned electricity metering circuit that fig. 1 provided, the utility model provides an electric energy metering chip can also provide extra technological effect. Fig. 4 is a schematic diagram of another electricity metering circuit provided by the present invention. As shown in fig. 4, the multiple overcurrent detection interfaces of the electric energy metering chip 11 are connected to the multiple overcurrent signal input interfaces of the control unit 14, so as to perform overcurrent protection on the multiple current input interfaces.
Overcurrent protection is a protection mode that causes a protection device to operate when a current exceeds a predetermined maximum value. Specifically, for the control unit 14, a plurality of general purpose input/output interface (GPIO) ports may be configured by software as a plurality of overcurrent signal input interfaces, so that the current sampling unit 12 performs overcurrent protection. Optionally, an overcurrent threshold may be set for the register, an absolute value is obtained from a waveform input by the current input interface, a fast effective value is obtained, and the fast effective value is compared with the overcurrent threshold, and when the absolute value exceeds the overcurrent threshold, the overcurrent detection interface outputs a high level. Each circuit of current channel in the electric energy metering chip 11 corresponds to one circuit of current sampling unit 12 and corresponds to one register for electric energy metering and corresponds to one overcurrent signal input interface, and when the current received by the register exceeds an overcurrent threshold, the overcurrent detection interface outputs a high level; when the current received by the register does not exceed the overcurrent threshold, the overcurrent detection interface outputs a low level. Optionally, if the control unit 14 receives a high level signal output by any overcurrent detection interface, the charging device corresponding to the current sampling unit 12 corresponding to the overcurrent detection interface may be controlled to stop charging, so as to protect the safety of the circuit.
In this embodiment, the overcurrent detection interface of the electric energy metering chip 11 is used to implement overcurrent protection on the current sampled by the current sampling unit, and the overcurrent signal is transmitted to the control unit, so that the control unit can be assisted to perform corresponding control.
On the basis of the electricity consumption metering circuit provided by the above figure 1, the utility model discloses in still provide a possible implementation mode of current sampling unit. Fig. 5 is a schematic diagram of a current sampling circuit provided by the present invention. As shown in fig. 5, each current sampling unit 12 includes: the power supply comprises two paths of current sampling subunits 121 and a current transformer 122, wherein a positive input end of the current transformer 122 is connected with an input end of one path of current sampling subunit 121, and an output end of the one path of current sampling subunit 121 is connected with a positive current input interface of the electric energy metering chip 11; the negative output end of the current transformer 122 is connected to the input end of the other current sampling subunit 121, and the output end of the other current sampling subunit 121 is connected to the negative current input interface of the electric energy metering chip 11.
In this embodiment, the current transformer 122 may be a through current transformer or a pillar current transformer, which is not limited in this embodiment. The current transformer 122 can convert the actually received current into a range that can be measured by the electric energy metering chip 11, so that the electric energy metering chip 11 can perform electric energy metering conveniently. The two current sampling subunits 121 have the same structure, and are respectively connected to two ends of the current transformer 122, so that differential signal sampling of current is realized. Meanwhile, for the electric energy metering chip 11, each current input interface comprises a positive current input interface and a negative current input interface, so that differential input of current is realized.
In this embodiment, the current transformer and the two current sampling subunits are used for current sampling, so that the collected current can be converted into a measurement range of the electric energy metering chip, and differential current input to the electric energy metering chip is realized.
Optionally, in order to clearly introduce the structure of the current sampling subunit, the present invention further provides a possible implementation manner of the current sampling subunit. Fig. 6 is a schematic diagram of an electric current sampling subunit provided by the present invention. As shown in fig. 6, the current sampling subunit 121 includes: the current sampling circuit comprises a first resistor R1, a second resistor R2 and a first capacitor C1, wherein one end of the first resistor R1 is an input end of the current sampling subunit 121, the other end of the first resistor R1 is an output end of the current sampling subunit 121, one end of the first resistor R1 is grounded through the second resistor R2, and the other end of the first resistor R1 is grounded through the first capacitor C1.
As shown in fig. 6, the current sampling circuit 12 is composed of a current transformer and two current sampling subunits connected in parallel, an output terminal of one current sampling subunit 121 is connected to the positive current input interface of the electric energy metering chip 11, and an output terminal of the other current sampling subunit 121 is connected to the negative current input interface of the electric energy metering chip 11. In order to limit the voltage input into the electric energy metering chip 11, the current sampling subunit is provided with voltage dividing resistors (R1 and R2) and a filter capacitor (C1), so that the output value of the current sampling subunit 121 is within a range measurable by the electric energy metering chip 11. Optionally, specific values of the current limiting resistor and the filter capacitor may be calculated according to the rated current of the charging device, the ratio of the current transformer, and the range of the input voltage of the electric energy metering chip 11. The utility model discloses resistance, electric capacity, the mutual-inductor that relates to in the circuit do not carry out any restriction.
In this embodiment, the current sampling subunit is provided with a voltage dividing resistor and a filter capacitor, so that the acquired current is converted into a measurement range of the electric energy metering chip, and differential current input to the electric energy metering chip is realized.
On the basis of the electricity consumption metering circuit provided by the above-mentioned fig. 1, the utility model discloses in still provide a possible implementation mode of voltage sampling unit. Fig. 7 is a schematic diagram of a voltage sampling circuit according to the present invention. As shown in fig. 7, the voltage sampling unit 13 includes: the voltage transformer 131, the third resistor R2, the fourth resistor R4, the fifth resistor R5 and the second capacitor C1; a first end of a primary side of the voltage transformer 131 is connected with a live wire input end ACINL in the alternating current input end through a third resistor R3, a second end of the primary side of the voltage transformer 131 is connected with a zero line input end ACINN in the alternating current input end, a first end of a secondary side of the voltage transformer is connected with a positive voltage input interface of the electric energy metering chip 11 through a fourth resistor R4, a fifth resistor R5 is further connected between the first end and the second end of the secondary side of the voltage transformer 131, the fifth resistor R5 is further grounded, and the fourth resistor R4 is further grounded through a second capacitor C2; the negative voltage input interface of the electric energy metering chip 11 is grounded.
In the present embodiment, the voltage input interface of the electric energy metering chip 11 is constituted by a positive voltage input interface and a negative voltage input interface. Differential input of the voltage channels is achieved through the positive voltage input interface and the negative voltage input interface. In order to limit the current input to the voltage transformer 131, R3 is set as a current limiting resistor, and the resistance value of R3 can be calculated according to the rated input current of the voltage transformer 131 and the circuit input voltage; in order to limit the voltage input into the electric energy metering chip 11, R4 and R5 are set as voltage dividing resistors, and C2 is set as a filter capacitor, and the values of the voltage dividing resistors and the filter capacitor can be calculated according to the range of the input voltage of the electric energy metering chip 11 and the ratio of the voltage transformer 131.
In this embodiment, a voltage sampling unit is formed by arranging a current-limiting resistor, a voltage-dividing resistor, a voltage transformer and a filter capacitor, so that the collected voltage is converted into a measuring range of an electric energy metering chip, and the electric energy metering is realized by matching with the electric energy metering chip.
Optionally, on the basis of the schematic diagram of one voltage sampling circuit provided in fig. 7, the present invention provides another possible implementation manner of the voltage sampling circuit. Fig. 8 is a schematic diagram of another voltage sampling circuit provided by the present invention. As shown in fig. 8, the voltage sampling unit 13 further includes: a filtering unit 132; the negative voltage input interface of the electric energy metering chip 11 is grounded through the filtering unit 132. The filter unit 132 is formed by connecting a resistor and a capacitor in parallel.
In this embodiment, the negative voltage input interface of the electric energy metering chip is grounded through the filtering unit, so that the generation of spike voltage is avoided, and the circuit stability is improved.
On the basis of the above embodiment, the utility model also provides a measurement system charges. Fig. 9 is a schematic diagram of a charging metering system provided by the present invention. As shown in fig. 9, the charge metering system 2 includes: a plurality of charging devices 21, and a power consumption metering circuit 1 connected to the plurality of charging devices 21; the electricity consumption metering circuit 1 is the electricity consumption metering circuit in any of the above embodiments.
Wherein, battery charging outfit 21 can be for arbitrary needs such as electric automobile, electric bicycle, electric power assisted bicycle equipment of charging use, the utility model discloses do not limit this. In the charging metering system 2, a plurality of charging devices 21 are respectively connected with a plurality of current sampling units 12, the number of the charging devices 21 is at most N, and the charging output ends of at most N charging devices 21 are respectively connected with the input ends of the N current sampling units, so that the plurality of current sampling units 12 in the electric energy metering chip 11 perform independent current sampling on the plurality of charging devices 21; the voltage sampling unit 13 is connected to the input terminals of the N charging devices to sample voltage signals for supplying power to the plurality of charging devices. After sampling, the electric energy metering chip 11 may transmit the electric energy metered by each charging device to the control unit 14 through the communication interface, and the control unit 14 performs corresponding control according to the electric energy.
In the embodiment, the charging metering system is formed by connecting a plurality of charging devices through the electric metering circuit capable of performing multi-path sampling, so that the cooperative charging and metering of the plurality of charging devices are realized, and the calculation pressure of the main controller is released.
In order to introduce the structure of the electricity metering circuit more clearly, the utility model discloses still provide a possible implementation mode of electricity metering circuit. Fig. 10 is another electricity metering circuit provided by the present invention. As shown in fig. 10, the electric energy metering chip in the electric energy metering circuit is BL0910. The BL0910 may be used as the electric energy metering chip 11 in any of the above embodiments. IP 1-IP 10 of BL0910 are positive current input interfaces of electric energy metering chip 11, IN 1-IN 10 are negative current input interfaces, VP is positive voltage input interface, VN is negative voltage input interface, RX/SDI is communication receiving interface, TX/SDO is communication sending interface, ZX is zero-crossing detection interface, IRQ is interrupt detection interface, M1-M10 are overcurrent detection interface, AVDD and DVDD are analog power input pin and digital power input pin respectively, AGND and DGND are analog ground pin and digital ground pin, VREF is reference voltage input output pin, DVDD18 is 1.8V voltage input/output pin. SEL is a function selection pin, so that when SEL =1, the communication interface is SPI; when SEL =0, the communication interface is UART. BL0910 has 10 current channels and 1 voltage channel, and can simultaneously meter 10 charging devices. As shown in fig. 10, the current transformer and the two current sampling subunits form a current sampling unit, the output end of one current sampling subunit is connected to the positive current input interface of BL0910, and the output end of the other current sampling subunit is connected to the negative current input interface of BL 0910; one end of the input end of a voltage sampling unit comprising a voltage transformer is connected with the live wire input end of the alternating current input end, and the other end of the input end of the voltage sampling unit is connected with the zero line input end; the negative voltage input interface of BL0910 is grounded through the filtering unit.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An electricity usage metering circuit, comprising: the device comprises an electric energy metering chip, a multi-path current sampling unit, a voltage sampling unit and a control unit;
the input end of the multi-path current sampling unit is respectively connected with the charging output ends of a plurality of charging devices so as to respectively sample output current signals of the plurality of charging output ends; the output end of the multi-path current sampling unit is connected with a plurality of current input interfaces of the electric energy metering chip;
the input end of the voltage sampling unit is connected with the alternating current input ends of the plurality of charging devices so as to sample input voltage signals, and the output end of the voltage sampling unit is connected with the voltage input interface of the electric energy metering chip;
and the data communication interface of the electric energy metering chip is connected with the communication interface of the control unit.
2. The electricity consumption metering circuit of claim 1, wherein a zero-crossing detection interface of the electric energy metering chip is connected with a zero-crossing signal input interface of the control unit so as to perform zero-crossing detection on the voltage sampling unit.
3. The electricity consumption metering circuit of claim 1, wherein the interrupt detection interface of the electricity consumption metering chip is connected with the interrupt signal input interface of the control unit to perform interrupt protection on the current sampling unit and the voltage sampling unit.
4. The electricity consumption metering circuit of claim 1, wherein the multiple overcurrent detection interfaces of the electric energy metering chip are connected with the multiple overcurrent signal input interfaces of the control unit to perform overcurrent protection on the multiple current input interfaces.
5. The electricity consumption metering circuit of claim 1, wherein each current sampling unit comprises: the current transformer and the two paths of current sampling subunits are arranged, wherein the positive input end of the current transformer is connected with the input end of one path of current sampling subunit, and the output end of the one path of current sampling subunit is connected with the positive current input interface of the electric energy metering chip;
and the negative output end of the current transformer is connected with the input end of the other current sampling subunit, and the output end of the other current sampling subunit is connected with the negative current input interface of the electric energy metering chip.
6. The electricity usage metering circuit of claim 5, wherein the current sampling sub-unit comprises: first resistance, second resistance and first electric capacity, wherein, the one end of first resistance does the input of current sampling subunit, the other end of first resistance does the output of current sampling subunit, the one end of first resistance still passes through second resistance ground connection, the other end of first resistance still passes through first electric capacity ground connection.
7. The electricity consumption metering circuit according to claim 1, wherein the voltage sampling unit comprises: the voltage transformer, the third resistor, the fourth resistor, the fifth resistor and the second capacitor;
the first end of the primary side of the voltage transformer is connected with a live wire input end in the alternating current input end through the third resistor, the second end of the primary side of the voltage transformer is connected with a zero line input end in the alternating current input end, the first end of the secondary side of the voltage transformer is connected with a positive voltage input interface of the electric energy metering chip through the fourth resistor, the fifth resistor is further connected between the first end and the second end of the secondary side of the voltage transformer, the fifth resistor is further grounded, and the fourth resistor is further grounded through the second capacitor;
and a negative voltage input interface of the electric energy metering chip is grounded.
8. The electricity consumption metering circuit of claim 7, wherein the voltage sampling unit further comprises: a filtering unit; and a negative voltage input interface of the electric energy metering chip is grounded through the filtering unit.
9. The electricity usage metering circuit of claim 1, wherein the communication interface is a universal asynchronous receiver/transmitter interface or a serial peripheral interface.
10. A charge metering system, comprising: the power consumption metering circuit is connected with the plurality of charging devices; the electricity consumption metering circuit is as claimed in any one of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115420942A (en) * | 2022-11-04 | 2022-12-02 | 浙江正泰物联技术有限公司 | Electric energy measuring device and power supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115420942A (en) * | 2022-11-04 | 2022-12-02 | 浙江正泰物联技术有限公司 | Electric energy measuring device and power supply system |
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