CN114200202B - Metering circuit and electricity taking method and medium thereof - Google Patents
Metering circuit and electricity taking method and medium thereof Download PDFInfo
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- CN114200202B CN114200202B CN202111500295.5A CN202111500295A CN114200202B CN 114200202 B CN114200202 B CN 114200202B CN 202111500295 A CN202111500295 A CN 202111500295A CN 114200202 B CN114200202 B CN 114200202B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
- G01R11/04—Housings; Supporting racks; Arrangements of terminals
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Abstract
The application discloses a metering circuit, a power taking method thereof and a medium, and relates to the technical field of circuit power supply. The metering circuit includes: MCU main power supply circuit, RS485 power supply circuit, measurement voltage sampling circuit. Wherein, the metering power supply circuit includes: the high-voltage power supply comprises a first diode, a zener diode, a first high-voltage regulator, a first energy storage capacitor, a first capacitor, a second capacitor and a third capacitor. The metering power supply circuit is not connected with the power frequency transformer any more, and at the moment, the metering power supply circuit and the power frequency transformer are mutually independent and have no connection relation, so that when the power frequency transformer fails, the metering power supply circuit can still work, and the metering function is continuously implemented. Thus, the purpose of improving the reliability of the metering power supply circuit is achieved.
Description
Technical Field
The application relates to the technical field of circuit power supply, in particular to a metering circuit, a power taking method thereof and a medium.
Background
With the rapid development of the economy in China, the electric demand of various industries is larger and larger, and the phenomenon of unbalanced electricity consumption at different times is also serious. In order to relieve the increasingly sharp contradiction between power supply and demand in China, improve the phenomenon of unbalanced power consumption, implement peak, flat and valley time-sharing electricity price system, improve the national electricity utilization efficiency and reasonably utilize power resources.
The power supply circuit of the existing single-phase electric energy meter is mainly divided into four parts, namely: MCU main power supply circuit, RS485 power supply circuit, measurement power supply circuit and measurement voltage sampling circuit. The MCU main power supply circuit, the RS485 power supply circuit and the metering power supply circuit are all connected with a power frequency transformer, the required low-voltage direct current power supply is obtained after the step-down-rectification-filtering operation is carried out through the power frequency transformer, and the obtained low-voltage direct current power supply is provided for the metering voltage sampling circuit to realize the metering function. The power supply of the power supply circuit of the single-phase electric energy meter is an alternating current 220V power supply. The power supply is realized through the winding resistor of the transformer, and the power supply occupies one path of output of the power frequency transformer in the power supply taking mode, so that the volume of the power frequency transformer is enlarged, the winding mode is complex, the conversion efficiency is low, and the cost is high. More importantly, the metering circuit cannot work when the power frequency transformer fails, so that the electric energy meter loses the metering function. At this time, the electric energy meter is used as a metering device, and the metering reliability is not high.
In view of the above-mentioned problems, it is an object of the present invention to provide a highly reliable electric energy meter measuring circuit.
Disclosure of Invention
It is an object of the present application to provide a metering circuit for improving the reliability of metering.
To solve the above technical problem, the present application provides a metering circuit, including: MCU main power supply circuit, RS485 power supply circuit, measurement voltage sampling circuit. The MCU main power supply circuit is connected with the power frequency transformer, the RS485 power supply circuit is connected with the power frequency transformer, and the metering voltage sampling circuit is connected with the metering power supply circuit;
the metering power supply circuit includes: the first diode, the zener diode, the first high voltage regulator, the first energy storage capacitor, the first capacitor, the second capacitor and the third capacitor;
the anode of the first diode is connected with the cathode of the zener diode, the cathode of the first diode is connected with the anode of the zener diode, the cathode of the first diode is connected with the first end of the first energy storage capacitor, the second end of the first energy storage capacitor is connected with the anode of the zener diode, the first end of the first capacitor is connected with the first end of the first energy storage capacitor, the second end of the first capacitor is connected with the second end of the first energy storage capacitor, the first end of the first capacitor is connected with the first input end of the first high voltage stabilizer, the second end of the first capacitor is connected with the second input end of the first high voltage stabilizer, the output end of the first high voltage stabilizer is connected with the first end of the second capacitor, the ground of the first high voltage stabilizer is grounded, the second end of the second capacitor is connected with the ground of the first high voltage stabilizer, the first end of the third capacitor is connected with the first end of the second capacitor, and the second end of the third capacitor is connected with the second end of the second capacitor.
Preferably, the metering voltage sampling circuit comprises: the capacitor comprises a safety capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a fourth capacitor and a fifth capacitor;
the first end of the safety capacitor is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the fourth resistor, the second end of the fifth resistor is connected with the second end of the safety capacitor, the second end of the fifth resistor is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the live wire, the first end of the fourth resistor is connected with the first end of the sixth resistor, the second end of the fourth resistor is connected with the second end of the sixth resistor, the common end of the second end of the fifth resistor, the first end of the sixth resistor and the first end of the fourth resistor is connected with the positive input end of the sampling chip, the first end of the seventh resistor is connected with the first end of the fifth capacitor, the second end of the seventh resistor is connected with the second end of the fifth capacitor, the second end of the seventh resistor is connected with the common end of the fifth capacitor and the common end of the fifth resistor is connected with the common end of the fifth resistor.
Preferably, the MCU main power supply circuit further comprises: the bridge rectifier, the second energy storage capacitor and the sixth capacitor;
the power frequency transformer is connected with the bridge rectifier, the bridge rectifier is connected with the second energy storage capacitor, the first end of the second energy storage capacitor is connected with the first end of the sixth capacitor, the second end of the second energy storage capacitor is connected with the second end of the sixth capacitor, and the common ground of the second end of the second energy storage capacitor and the second end of the sixth capacitor is grounded.
Preferably, the RS485 power supply circuit further includes: the second high-voltage stabilizer, the second diode, the third energy storage capacitor, the seventh capacitor and the eighth capacitor;
the third energy storage capacitor is connected with the power frequency transformer through a second diode, the anode of the second diode is connected with the power frequency transformer, the cathode of the second diode is connected with the first end of the third energy storage capacitor, the first end of the third energy storage capacitor is connected with the first end of the seventh capacitor, the second end of the third energy storage capacitor is connected with the second end of the seventh capacitor, the first end of the seventh capacitor is connected with the first input end of the second high-voltage stabilizer, the second end of the seventh capacitor is connected with the second input end of the second high-voltage stabilizer, the output end of the second high-voltage stabilizer is connected with the first end of the eighth capacitor, the grounding end of the second high-voltage stabilizer is grounded, and the second end of the eighth capacitor is connected with the grounding end of the second high-voltage stabilizer.
Preferably, the method further comprises: a varistor. The first end of the piezoresistor is connected with the power frequency transformer, the first end of the piezoresistor is connected with the zero line, and the second end of the piezoresistor is connected with the live wire.
Preferably, the method further comprises: a thermistor. The first end of the thermistor is connected with the power frequency transformer, the second end of the thermistor is connected with the zero line, and the third end of the thermistor is connected with the fire wire.
Preferably, the safety capacitor operates in a capacitive reactance state.
The utility model provides a metering circuit, include: MCU main power supply circuit, RS485 power supply circuit, measurement voltage sampling circuit. Wherein, the metering power supply circuit includes: the high-voltage power supply comprises a first diode, a zener diode, a first high-voltage regulator, a first energy storage capacitor, a first capacitor, a second capacitor and a third capacitor. The metering power supply circuit is not connected with the power frequency transformer any more, and at the moment, the metering power supply circuit and the power frequency transformer are mutually independent and have no connection relation, so that when the power frequency transformer fails, the metering power supply circuit can still work, and the metering function is continuously implemented. Thus, the purpose of improving the reliability of the metering power supply circuit is achieved.
The application also provides a power taking method of the metering circuit, which is applied to the metering device and the computer readable storage medium and has the same effects.
Drawings
For a clearer description of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a device diagram of a metering circuit provided herein;
FIG. 2 is a device diagram of another metering circuit provided herein;
FIG. 3 is a circuit diagram of a metering circuit provided herein;
fig. 4 is a circuit diagram of another metering circuit provided herein.
Wherein 10 is MCU main power supply circuit, 11 is RS485 power supply circuit, 20 is measurement power supply circuit, 21 is measurement voltage sampling circuit.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments herein without making any inventive effort are intended to fall within the scope of the present application.
The core of the present application is to provide a metering circuit which can improve the reliability of metering. In order to provide a better understanding of the present application, those skilled in the art will now make further details of the present application with reference to the drawings and detailed description.
With the rapid development of the economy in China, the electric demand of various industries is larger and larger, and the phenomenon of unbalanced electricity consumption at different times is also serious. In order to relieve the increasingly sharp contradiction between power supply and demand in China, improve the phenomenon of unbalanced power consumption, implement peak, flat and valley time-sharing electricity price system, improve the national electricity utilization efficiency and reasonably utilize power resources.
The power supply circuit of the existing single-phase electric energy meter is mainly divided into four parts, namely: MCU main power supply circuit, RS485 power supply circuit, measurement power supply circuit and measurement voltage sampling circuit. The MCU main power supply circuit, the RS485 power supply circuit and the metering power supply circuit are all connected with a power frequency transformer, the required low-voltage direct current power supply is obtained after the step-down-rectification-filtering operation is carried out through the power frequency transformer, and the obtained low-voltage direct current power supply is provided for the metering voltage sampling circuit to realize the metering function. The power supply of the power supply circuit of the single-phase electric energy meter is an alternating current 220V power supply. The power supply is realized through the winding resistor of the transformer, and the power supply occupies one path of output of the power frequency transformer in the power supply taking mode, so that the volume of the power frequency transformer is enlarged, the winding mode is complex, the conversion efficiency is low, and the cost is high. More importantly, the metering circuit cannot work when the power frequency transformer fails, so that the electric energy meter loses the metering function. At this time, the electric energy meter is used as a metering device, and the metering reliability is not high.
The present application provides a metering circuit capable of improving the reliability of metering in order to solve the above-mentioned problems. Fig. 1 is a device diagram of a metering circuit provided in the present application. Fig. 2 is a device diagram of another metering circuit provided in the present application. As shown in fig. 1 and 2, the metering circuit includes: MCU main power supply circuit 10, RS485 power supply circuit 11, measurement power supply circuit 20, measurement voltage sampling circuit 21.
The MCU main power supply circuit 10 is connected with the power frequency transformer T1, the RS485 power supply circuit 11 is connected with the power frequency transformer T1, and the metering voltage sampling circuit 21 is connected with the metering power supply circuit 20;
fig. 3 is a circuit diagram of a metering circuit provided in the present application, and as shown in fig. 3, the metering power supply circuit 20 includes: the high-voltage power supply comprises a first diode D1, a zener diode D3, a first high-voltage regulator U1, a first energy storage capacitor C9, a first capacitor C1, a second capacitor C2 and a third capacitor C3.
The positive pole of first diode D1 is connected with the negative pole of zener diode D3, the negative pole of first diode D1 is connected with the positive pole of zener diode D3, the negative pole of first diode D1 is connected with the first end of first energy storage electric capacity C9, the second end of first energy storage electric capacity C9 is connected with the positive pole of zener diode D3, the first end of first electric capacity C1 is connected with the first end of first energy storage electric capacity C9, the second end of first electric capacity C1 is connected with the second end of first energy storage electric capacity C9, the first end of first electric capacity C1 is connected with the first input of first high voltage regulator U1, the second end of first electric capacity C1 is connected with the second input of first high voltage regulator U1, the output of first high voltage regulator U1 is connected with the first end of second electric capacity C2, the ground connection of first high voltage regulator U1, the second end of second electric capacity C2 is connected with the first end of first high voltage regulator U1, the first end of second electric capacity C2 is connected with the first end of second electric capacity C3.
A metering circuit mentioned in this embodiment includes: MCU main power supply circuit 10, RS485 power supply circuit 11, measurement power supply circuit 20, measurement voltage sampling circuit 21. Wherein the metering power supply circuit 20 includes: the high-voltage power supply comprises a first diode D1, a zener diode D3, a first high-voltage regulator U1, a first energy storage capacitor C9, a first capacitor C1, a second capacitor C2 and a third capacitor C3. The metering power supply circuit 20 is not connected with the power frequency transformer T1 any more, and at this time, the metering power supply circuit 20 and the power frequency transformer T1 are mutually independent and have no connection relation, so when the power frequency transformer T1 fails, the metering power supply circuit 20 can still work, and the metering function is continuously implemented. As can be seen from this, the purpose of improving the reliability of the metering power supply circuit 20 is achieved.
Fig. 3 is a circuit diagram of a metering circuit provided herein. On the basis of the above embodiment, as shown in fig. 3, the metering voltage sampling circuit 21 includes: safety capacitor, first resistance R1, second resistance R2, third resistance R3, fourth resistance R4, fifth resistance R5, sixth resistance R6, seventh resistance R7, fourth capacitance C4, fifth capacitance C5.
The first end of the safety capacitor is connected with the first end of a first resistor R1, the second end of the first resistor R1 is connected with the first end of a second resistor R2, the second end of the second resistor R2 is connected with the first end of a third resistor R3, the second end of the third resistor R3 is connected with the first end of a fourth resistor R4, the second end of the fourth resistor R4 is connected with the first end of a fifth resistor R5, the second end of the fifth resistor R5 is connected with the second end of the safety capacitor, the second end of the fifth resistor R5 is connected with the first end of a sixth resistor R6, the second end of the sixth resistor R6 is connected with a live wire, the second end of the fourth capacitor C4 is connected with the second end of the sixth resistor R6, the public end of the fifth resistor R5, the first end of the fourth resistor R6 and the first end of the fourth capacitor C4 are connected with the positive input end of a sampling chip, the second end of the fifth resistor R7 and the fifth capacitor C5 are connected with the fifth end of the fifth resistor C7, and the public end of the fifth resistor C5 and the fifth capacitor C5 are connected with the fifth end of the fifth resistor C7.
The safety capacitor mentioned in this embodiment refers to a safety capacitor that does not endanger personal safety after the capacitor fails. The safety capacitor is generally only used for filtering in the anti-interference circuit. For safety and EMC considerations, it is common to suggest the addition of safety capacitors at the power inlet. The safety capacitor is used in a power filter to play a role in power filtering, and plays a role in filtering common mode and differential mode interference respectively. In this embodiment, the safety capacitor is used for safety, and the safety capacitor is used under the alternating current 220V voltage to make the safety capacitor work in the capacitive reactance state and be equivalent to a resistor. And voltage sampling is performed in the metering circuit by using the resistor equivalent to the safety capacitor. At this time, the metering sampling circuit does not take electricity through an auto-coupling winding connected with the power frequency transformer T1, but directly adopts a polypropylene safety capacitor with safety certification to reduce and limit current, and then carries out rectification and voltage stabilization operation through a voltage stabilizing diode D3 to obtain a direct current power supply required by the metering circuit. It should be noted that, the metering sampling circuit no longer draws power through the autotransformer that is connected with power frequency transformer T1, has reduced the wire winding of power frequency transformer T1, has reduced the volume of power frequency transformer T1, through the mode that adopts metering voltage sampling circuit 21 to draw power, has increased the cloth board space of printed circuit board (Printed circuit boards, PCB). Meanwhile, the safety capacitor is connected with the voltage dividing resistor of the voltage sampling circuit, wherein the voltage dividing resistor is respectively as follows: the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5; in the circuit structure, the safety capacitor is connected with the voltage dividing resistor in parallel, and the voltage dividing resistor is used as a bleeder resistor of the safety capacitor to play a role in bleeding current.
Fig. 4 is a circuit diagram of another metering circuit provided herein. On the basis of the above embodiment, as a preferred embodiment, as shown in fig. 4, the MCU main power supply circuit 10 further includes: a bridge rectifier U3, a second energy storage capacitor C10 and a sixth capacitor C6;
the power frequency transformer T1 is connected with the bridge rectifier U3, the bridge rectifier U3 is connected with the second energy storage capacitor C10, the first end of the second energy storage capacitor C10 is connected with the first end of the sixth capacitor C6, the second end of the second energy storage capacitor C10 is connected with the second end of the sixth capacitor C6, and the common ground of the second end of the second energy storage capacitor C10 and the second end of the sixth capacitor C6 is grounded.
In this embodiment, the bridge rectifier U3 is formed by bridge-connecting four rectifying silicon chips and encapsulating with an insulating plastic material. The high-power bridge rectifier U3 is provided with a zinc metal shell package outside the insulating layer so as to enhance heat dissipation. Bridge rectifier U3 is of many types, including flat, round, square, bench-shaped (split and patch), etc. The maximum rectified current is from 0.5A to 100A, and the highest reverse peak voltage is from 50V to 1600V. The safety capacitor provided in this embodiment can accept 330V ac voltage at maximum. Therefore, the safety capacitor can be applied to a circuit applied to 220V ac voltage.
On the basis of the above embodiment, as a preferred embodiment, as shown in fig. 4, the RS485 power supply circuit 11 further includes: the second high-voltage regulator U2, the second diode D2, the third energy storage capacitor C11, the seventh capacitor C7 and the eighth capacitor C8;
the third energy storage capacitor C11 is connected with the power frequency transformer T1 through a second diode, the anode of the second diode is connected with the power frequency transformer, the cathode of the second diode is connected with the first end of the third energy storage capacitor C11, the first end of the third energy storage capacitor C11 is connected with the first end of the seventh capacitor C7, the second end of the third energy storage capacitor C11 is connected with the second end of the seventh capacitor C7, the first end of the seventh capacitor C7 is connected with the first input end of the second high-voltage stabilizer U2, the second end of the seventh capacitor C7 is connected with the second input end of the second high-voltage stabilizer U2, the output end of the second high-voltage stabilizer U2 is connected with the first end of the eighth capacitor C8, the grounding end of the second high-voltage stabilizer U2 is grounded, and the second end of the eighth capacitor C8 is connected with the grounding end of the second high-voltage stabilizer U2.
RS485 is a standard defining the electrical characteristics of the drivers and receivers in a balanced digital multi-drop system. Digital communication networks using this standard are capable of transmitting signals efficiently under long-range conditions and in environments where electronic noise is large. RS485 makes it possible to connect to the local network and the configuration of the multi-branch communication link. RS485 has two kinds of wiring methods, is respectively: two-wire and four-wire systems. Four-wire system can only realize a point-to-point communication mode, and a two-wire system wiring mode is rarely adopted at present, and the wiring mode is a bus topology structure, and can be used for connecting 32 nodes on the same bus at most. A master-slave communication method is generally adopted in the RS485 communication network. In many cases, when the RS485 communication link is connected, the "a" and "B" ends of each interface are connected simply in a pair-to-pair manner, and this connection method can work normally in many occasions, but has a great hidden trouble, one of the reasons is common mode interference: the RS485 interface adopts a differential signal transmission mode, signals do not need to be detected relative to a certain reference point, the system only needs to detect the potential difference between two lines, but the common-mode voltage range of a transceiver is easy to ignore, the common-mode voltage range of the RS485 transceiver is-7 to +12V, the common-mode voltage range of the upper transceiver is only satisfied, and the whole network can work normally; when the common mode voltage in the network line exceeds the range, the communication stability and reliability are affected, and even the interface is damaged. Therefore, in the present embodiment, the RS485 power supply circuit 11 is provided for long-distance communication.
On the basis of the above embodiment, the method further comprises: the piezoresistor R8.
The first end of the piezoresistor R8 is connected with the power frequency transformer T1, the first end of the piezoresistor R8 is connected with the zero line, and the second end of the piezoresistor R8 is connected with the live line. In this embodiment, the varistor R8 is directly connected to the 220V ac voltage, so as to protect the whole circuit, and prevent unnecessary cost waste caused by damage to components in the circuit due to excessive voltage.
On the basis of the above embodiment, the method further comprises: and a thermistor R9.
The first end of the thermistor R9 is connected with the power frequency transformer T1, the second end of the thermistor R9 is connected with the zero line, and the third end of the thermistor R9 is connected with the fire wire. The thermistor R9 in this embodiment plays a role of overvoltage protection. The thermistor R9 can bear 330V alternating voltage at maximum, and when the voltage in the circuit exceeds 220V, the thermistor R9 performs the functions of current limiting and voltage dividing, and the overvoltage protection function is started.
The sampling chip in the metering voltage sampling circuit 21 is considered on the basis of the above-described embodiment. The sampling chip can also comprise:
a memory for storing a computer program;
a processor for implementing the metering voltage sampling circuit 21 to sample the voltage in the circuit when executing the computer program.
The device for connecting the sampling chip provided in this embodiment may include, but is not limited to, a smart phone, a tablet computer, a notebook computer, a desktop computer, or the like.
The processor may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor may be implemented in at least one hardware form of DSP (Digital Signal Processing ), FPGA (Field-Programmable Gate Array, field programmable gate array), PLA (Programmable Logic Array ). The processor may also include a main processor, which is a processor for processing data in an awake state, also called a CPU (Central Processing Unit ), and a coprocessor; a coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor may incorporate a GPU (Graphics Processing Unit, image processor) for rendering and rendering of content required to be displayed by the display screen. In some embodiments, the processor may also include an AI (Artificial Intelligence ) processor for processing computing operations related to machine learning.
The memory may include one or more computer-readable storage media, which may be non-transitory. The memory may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In this embodiment, the memory is at least used for storing a computer program, where the computer program, when loaded and executed by the processor, is capable of implementing the relevant steps of sampling the voltage in the voltage sampling circuit. In addition, the resources stored in the memory can also comprise an operating system, data and the like, and the storage mode can be short-term storage or permanent storage. The operating system may include Windows, unix, linux, among others. In some embodiments, the device connected with the sampling chip can further comprise a display screen, an input-output interface, a communication interface, a power supply and a communication bus.
It will be appreciated by those skilled in the art that the structures mentioned in the above embodiments do not constitute a limitation on the means by which the sampling chip is connected, and may include more or fewer components than the means mentioned in the above embodiments. The device connected with the sampling chip comprises a memory and a processor, wherein the processor can sample the voltage in the voltage sampling circuit when executing a program stored in the memory.
Finally, the present application also provides a corresponding embodiment of the computer readable storage medium, which is applied to the sampling chip mentioned in the above embodiment. The computer-readable storage medium has stored thereon a computer program which, when executed by a processor, performs the operations described in the embodiments mentioned above.
It will be appreciated that if the operations mentioned in the above embodiments are implemented in the form of software functional units and sold or used as separate products, they may be stored in a computer readable storage medium. With such understanding, the technical solution of the present application, or a part contributing to the prior art or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium, performing all or part of the steps of the method described in the various embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The metering circuit provided by the present application is described in detail above. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (7)
1. A metering circuit, comprising: the device comprises an MCU main power circuit (10), an RS485 power circuit (11), a metering power circuit (20) and a metering voltage sampling circuit (21);
the MCU main power supply circuit and the RS485 power supply circuit comprise a common power frequency transformer, the MCU main power supply circuit and the RS485 power supply circuit are connected through the power frequency transformer, the metering power supply circuit is connected with the power frequency transformer, and the power frequency transformer is subjected to voltage reduction, rectification and filtering to obtain a low-voltage direct current power supply, and the low-voltage direct current power supply is provided for the metering voltage sampling circuit;
the metering power supply circuit (20) includes: the first diode, the zener diode, the first high voltage regulator, the first energy storage capacitor, the first capacitor, the second capacitor and the third capacitor;
the positive pole of first diode with zener diode's negative pole is connected, first diode's negative pole with zener diode's first end is connected, first energy storage capacitor's second end with zener diode's positive pole is connected, first capacitor's first end is connected in first energy storage capacitor's first end, first capacitor's second end with first energy storage capacitor's second end is connected, first capacitor's first end with first high voltage regulator's first input is connected, first high voltage regulator's second end with first high voltage regulator's second input is connected, first high voltage regulator's output with second capacitor's first end is connected, first high voltage regulator's ground connection, second capacitor's second end with first high voltage regulator's ground connection, third capacitor's first end with second capacitor's first end is connected, third capacitor's second end is connected with first capacitor's second end.
2. The metering circuit according to claim 1, characterized in that the metering voltage sampling circuit (21) comprises: the capacitor comprises a safety capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a fourth capacitor and a fifth capacitor;
the first end of the safety capacitor is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the second end of the safety capacitor, the second end of the fifth resistor is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the live wire, the first end of the fourth capacitor is connected with the first end of the sixth resistor, the common end of the fifth resistor, the first end of the sixth resistor and the first end of the fourth capacitor is connected with the input end of the sampling chip, the second end of the fifth resistor is connected with the fifth end of the fifth resistor, the common end of the seventh resistor is connected with the fifth end of the seventh resistor, the common end of the seventh resistor is connected with the fifth end of the fifth resistor.
3. The metering circuit according to claim 1, wherein the MCU main power supply circuit (10) further comprises: the bridge rectifier, the second energy storage capacitor and the sixth capacitor;
the power frequency transformer is connected with the bridge rectifier, the bridge rectifier is connected with the second energy storage capacitor, the first end of the second energy storage capacitor is connected with the first end of the sixth capacitor, the second end of the second energy storage capacitor is connected with the second end of the sixth capacitor, and the common ground of the second end of the second energy storage capacitor and the second end of the sixth capacitor is grounded.
4. The metering circuit of claim 1 wherein the RS485 power supply circuit (11) further comprises: the second high-voltage stabilizer, the second diode, the third energy storage capacitor, the seventh capacitor and the eighth capacitor;
the third energy storage capacitor is connected with the power frequency transformer through a second diode, the anode of the second diode is connected with the power frequency transformer, the cathode of the second diode is connected with the first end of the third energy storage capacitor, the first end of the third energy storage capacitor is connected with the first end of the seventh capacitor, the second end of the third energy storage capacitor is connected with the second end of the seventh capacitor, the first end of the seventh capacitor is connected with the first input end of the second high-voltage stabilizer, the second end of the seventh capacitor is connected with the second input end of the second high-voltage stabilizer, the output end of the second high-voltage stabilizer is connected with the first end of the eighth capacitor, the ground of the second high-voltage stabilizer is grounded, and the second end of the eighth capacitor is connected with the ground of the second high-voltage stabilizer.
5. A metering circuit as claimed in claim 2 or claim 3 further comprising: a piezoresistor;
the first end of the piezoresistor is connected with the power frequency transformer, the first end of the piezoresistor is connected with the zero line, and the second end of the piezoresistor is connected with the live line.
6. A metering circuit as claimed in claim 2 or claim 3 further comprising: a thermistor;
the first end of the thermistor is connected with the power frequency transformer, the second end of the thermistor is connected with the zero line, and the third end of the thermistor is connected with the fire wire.
7. A metering circuit as claimed in claim 2 wherein the safety capacitor operates in a capacitive reactance state.
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| CN202111500295.5A CN114200202B (en) | 2021-12-09 | 2021-12-09 | Metering circuit and electricity taking method and medium thereof |
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| CN202111500295.5A CN114200202B (en) | 2021-12-09 | 2021-12-09 | Metering circuit and electricity taking method and medium thereof |
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| CN114200202B true CN114200202B (en) | 2024-03-22 |
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