CN202256493U

CN202256493U - Single-phase multifunctional power meter

Info

Publication number: CN202256493U
Application number: CN2011203782587U
Authority: CN
Inventors: 束龙胜; 孙传峰; 秦小州; 陈坚伟; 汪桂林; 蒋丽丽; 钱田义; 洪晨义; 刘建
Original assignee: Anhui Xinlong Electrical Co Ltd
Current assignee: Anhui Xinlong Electrical Co Ltd
Priority date: 2011-09-29
Filing date: 2011-09-29
Publication date: 2012-05-30
Anticipated expiration: 2021-09-29

Abstract

The utility model discloses a single-phase multifunctional power meter which comprises a microprocessor, a display circuit, a signal acquisition circuit, a switching value acquisition circuit, a key signal acquisition circuit, an output circuit, a communication interface circuit and a transmission output circuit, wherein the signal acquisition circuit, the switching value acquisition circuit and the key signal acquisition circuit are respectively connected with the display circuit, the relay output circuit and the communication interface circuit by the microprocessor; the microprocessor is also connected with the transmission output circuit; the microprocessor is connected with an upper computer by the communication interface circuit; and an RS 485 interface and a ModBus communication protocol are adopted. In addition, the power meter is also capable of correspondingly outputting current of 4-20mA according to measured voltage and current. By adopting an internet service provider (ISP) on-line programmable way, the single-phase multifunctional power meter is convenient for modifying software and high in cost performance; and compared with a traditional multifunctional meter, the single-phase multifunctional power meter has higher cost performance.

Description

A kind of single-phase multifunctional power instrument

Technical field

The utility model relates to power measure meters, relates in particular to a kind of single-phase multifunctional power instrument.

Background technology

Along with the continuous development of Power System Intelligentization, multifunction, crucial effects has also been played in the use of multi-functional electric weight instrument.

Traditional single-phase power instrument exists deficiency on man-machine interface and function.Some need measure single-phase voltage or electric current need communication simultaneously, become give, the place of functions such as DI/DO, traditional single-phase power instrument can not satisfy actual needs.And use the three-phase multifunctional power instrument can cause the waste of resource.

The utility model content

The utility model technical matters to be solved provides a kind of single-phase multifunctional power instrument, to satisfy single-phase demonstration, needs functions such as communication, change are sent, DI/DO simultaneously.

For solving the problems of the technologies described above; The technical scheme of the utility model is 1, a kind of single-phase multifunctional power instrument; Described single-phase multifunctional power instrument; Comprise microprocessor, display circuit, signal acquisition circuit, switch acquisition circuit, push button signalling Acquisition Circuit, relay output circuit and communication interface circuit, become and send output circuit to form; Described signal acquisition circuit, switch acquisition circuit and push button signalling Acquisition Circuit are connected with display circuit, relay output circuit, communication interface circuit respectively through microprocessor, and described microprocessor also send output circuit to be connected with change;

Described microprocessor is used to read the electric quantity data that signal acquisition circuit collects, and after treatment, the voltage/current value shows through display circuit, and links to each other with host computer through the communication interface circuit.

Described signal acquisition circuit is made up of current/voltage mutual inductor and computation chip; The curtage signal is through behind the mutual inductor; Be transformed to the collectable signal of computation chip, microprocessor reads electric current, the magnitude of voltage of computation chip through the SPI input/output port.

Described change send output circuit to be made up of filtering circuit, operational amplification circuit; The signal that microprocessor will be gathered is through the pin output voltage signal from exporting behind the PWM; Obtain d. c. voltage signal through behind the filtering circuit; Signal is input to operational amplification circuit, after handling through operational amplification circuit, and output direct current 4-20mA current signal on lead-out terminal.

Described microprocessor is a single-chip microcomputer, and model is STC12C5624AD.

A kind of single-phase multifunctional power instrument owing to adopt said structure, has been made up of the power measurement system of instrument microprocessor STC12C5624AD and computation chip CS5463.Microprocessor reads the electric quantity data that computation chip collects, and after treatment, charge value is shown by charactron.Power instrument can turn over operations such as screen, parameter setting, pilot relay action through 4 button logarithmic code pipes.Microprocessor links to each other with host computer through communication interface module RSM485CT, adopts the RS485 interface, the MODBUS communications protocol.Power instrument can also be according to the corresponding output of the size 4-20mA electric current of measured voltage, electric current in addition.This instrument adopts ISP online programmable mode, makes things convenient for software modification: compare with traditional multifunction instrument, high cost performance is arranged.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is done further detailed explanation;

Fig. 1 is a kind of single-phase multifunctional power instrument of the utility model circuit structure block diagram;

Fig. 2 is a signal acquisition circuit structured flowchart shown in Figure 1;

Fig. 3 is push button signalling Acquisition Circuit and a relay output circuit structure block diagram shown in Figure 1;

Fig. 4 is a display circuit structured flowchart shown in Figure 1;

Fig. 5 is a communication interface circuit structure block diagram shown in Figure 1;

Fig. 6 send the output circuit structure block diagram for change shown in Figure 1;

In Fig. 1-Fig. 6,1, signal acquisition circuit; 2, computation chip; 3, display circuit; 4, output circuit is sent in change; 5, microprocessor; 6, communication interface circuit; 7, switch acquisition circuit; 8, push button signalling Acquisition Circuit; 9, relay output circuit.

Embodiment

As shown in Figure 1, Fig. 1 is the hardware circuit block diagram of the utility model power instrument; Mainly by: the collection of the collection of microprocessor STC12C5624AD, electric weight and processing, button and switching value signal, display system, RS485 communication, become and send output and relay output etc. partly to form.

The single-phase multifunctional power instrument; Described single-phase multifunctional power instrument; Comprise the power supply, microprocessor 5, display circuit 3, signal acquisition circuit 1, switch acquisition circuit 7, push button signalling Acquisition Circuit 8, relay output circuit 9 and the communication interface circuit 6 that are connected with each circuit power input end, become and send output circuit 4 compositions; Described signal acquisition circuit 1, switch acquisition circuit 7 are connected with display circuit 3, relay output circuit 9, communication interface circuit 3 respectively through microprocessor 5 with push button signalling Acquisition Circuit 8, and described microprocessor 5 also send output circuit 4 to be connected with change.

As shown in Figure 2, Fig. 2 is the signal acquisition circuit structured flowchart; The curtage signal is transformed to computation chip 2 collectable signals through behind the mutual inductor.Can realize the function of measuring of computation chip.Microprocessor 5 can be controlled computation chip through the SPI input/output port.The electric current, the voltage that may be read into computation chip are equivalent, also can carry out number orders such as calibration.

Referring to Fig. 3, Fig. 3 is push button signalling Acquisition Circuit and output circuit structure block diagram; Have the input of 4 way switch amounts in the meter switch amount Acquisition Circuit 7, be provided with the output of No. 2 relays in the relay output circuit 9.Through the processing of photoelectricity coupled circuit, microprocessor 5 can obtain the signal of its switching value through its I/O mouth of overscanning to the switching value signal of input at this moment earlier.The state of switching value can intuitively show through charactron.Adopt the photoelectricity coupled circuit can strengthen antijamming capability, eliminate the interference of the extraneous forceful electric power signal that possibly introduce.Referring to Fig. 4, Fig. 4 display circuit structured flowchart; The design of man-machine interface comprises keyboard and two aspects of display design.Keyboard can turn over screen to the charactron that shows in the push button signalling Acquisition Circuit 8, instrument is carried out operations such as parameter setting, verification, remote control, is the bridge of man-machine interaction.The LED display circuit also is the important component part of man-machine interface, and LED needs the HD7279 chip for driving to drive.

Referring to Fig. 5, Fig. 5 is a communication interface circuit structure block diagram; Telecommunication circuit design be accomplish multifunctional meter and main frame and and the operator between the part transmitted of information, microprocessor 5 links to each other with host computer through communication interface module RSM485CHT, network communication employing RS485 level, MODBUS agreement.

Referring to Fig. 6, Fig. 6 send the output circuit structure block diagram for becoming; System can be according to the big or small corresponding output 4-20mA electric current of measuring voltage, electric current.Microprocessor 5 through behind the PWM from the output pin output voltage.Can obtain DC voltage through behind the filtering circuit, signal is input to amplifier LM224, through the processing such as amplification of amplifier, can obtain the 4-20mA electric current of stable output at the output terminal of amplifier.

Combine accompanying drawing that the utility model has been carried out exemplary description above; Obviously the concrete realization of the utility model does not receive the restriction of aforesaid way; As long as adopted method design of the utility model and the various improvement that technical scheme is carried out; Or directly apply to other occasion without improvement, all within the protection domain of the utility model.

Claims

1. single-phase multifunctional power instrument; It is characterized in that; Described single-phase multifunctional power instrument; Comprise microprocessor (5), display circuit (3), signal acquisition circuit (1), switch acquisition circuit (7), push button signalling Acquisition Circuit (8), relay output circuit (9) and communication interface circuit (6), become and send output circuit (4) to form; Described signal acquisition circuit (1), switch acquisition circuit (7) and push button signalling Acquisition Circuit (8) are connected with display circuit (3), relay output circuit (9), communication interface circuit (3) respectively through microprocessor (5), and described microprocessor (5) also send output circuit (4) to be connected with change;

Described microprocessor (5) is used to read the electric quantity data that signal acquisition circuit (1) collects, and after treatment, the voltage/current value shows through display circuit (3), and links to each other with host computer through the communication interface circuit.

2. single-phase multifunctional power instrument according to claim 1; It is characterized in that; Described signal acquisition circuit (1) is made up of current/voltage mutual inductor and computation chip; The curtage signal is transformed to the collectable signal of computation chip (2) through behind the mutual inductor, and microprocessor reads electric current, the magnitude of voltage of computation chip through the SPI input/output port.

3. single-phase multifunctional power instrument according to claim 1; It is characterized in that; Described change send output circuit (4) to be made up of filtering circuit, operational amplification circuit, and the signal that microprocessor (5) will be gathered obtains d. c. voltage signal through the pin output voltage signal from exporting behind the PWM through behind the filtering circuit; Signal is input to operational amplification circuit, through operational amplification circuit output terminal output direct current 4-20mA current signal.

4. according to claim 1 or 2 or 3 described single-phase multifunctional power instruments, it is characterized in that described microprocessor (5) is a single-chip microcomputer, model is STC12C5624AD.