CN201974472U

CN201974472U - Single circuit DC (direct current) electric energy measurement instrument

Info

Publication number: CN201974472U
Application number: CN201020658550XU
Authority: CN
Inventors: 傅清华
Original assignee: Guangdong Yada Electric Co Ltd
Current assignee: Guangdong Yada Electric Co Ltd
Priority date: 2010-12-14
Filing date: 2010-12-14
Publication date: 2011-09-14
Anticipated expiration: 2020-12-14

Abstract

The utility model discloses a single circuit DC electric energy measurement instrument suitable for metering DC energies of storage batteries, solar cell panels, DC power supplies and the like. The single circuit DC electric energy measurement instrument is characterized by comprising a display module, a data storage module, a CPU (central processing unit), a precision metering chip and a current and voltage sampling module; the current and voltage sampling module is used for acquiring voltage signals by a linear optical-coupler isolator, acquiring current signals by a shunt, and transmitting the voltage signals and the current signals to the precision metering chip; the precision metering chip is used for metering the received voltage signals and the current signals, and transmitting the metered signals to the CPU; and the CPU is used for calculating out electric energy parameters according to the metered signals, and transmitting the electric energy parameters to the display module for display, or storing the electric energy parameters in the data storage module. The single circuit DC electric energy measurement instrument can measure the single circuit DC, DC voltage and DC power, meter single circuit DC electric energy, and record 360-day history electric energy consumption.

Description

A kind of single loop direct current energy measurement instrument

Technical field

The utility model relates to a kind of being fit to accumulator, solar panel, and the metering of dc energy sources such as direct supply also can be used for industrial and mining enterprises, covil construction, the modern times such as building automatic are for the single loop direct current energy measurement instrument of joining dc system.

Background technology

In recent years, along with the generation and the application of new forms of energy such as sun power, wind energy, need a kind of automatic gauge utensil that can measure the direct current energy.The development prospect in particularly following electric automobile market is huge, and the vehicle charging stake must need the direct current energy metering when using dc system.

Summary of the invention

In order to overcome above-mentioned deficiency, the utility model purpose is to provide a kind of single loop direct current energy measurement instrument that measures DC current, DC voltage and DC power.

To achieve these goals, the technical solution adopted in the utility model is: a kind of single loop direct current energy measurement instrument, it is characterized in that: it includes display module, data memory module, central processing unit, precision computation chip and current-voltage sampling module, described current-voltage sampling module, obtain voltage signal with the linear optical coupling isolation, obtain current signal with shunt, and send voltage signal and current signal to the precision computation chip; Described precision computation chip, measure in order to voltage signal and the current signal that will receive, and the voltage signal after will measuring and current signal send central processing unit to, voltage signal and the current signal of central processing unit after according to metering calculates electrical energy parameter, and sends electrical energy parameter to display module and show or store in the data memory module.

Described central processing unit also is connected with the clock circuit module.

Described central processing unit also is connected with keyboard input circuit module.

The used power supply of used central processing unit is a battery.

The beneficial effects of the utility model: this power measuring instrument energy measurement single loop DC current, DC voltage, DC power can also be measured single loop direct current energy; Can also write down nearly 360 days historical power consumption.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is the structured flowchart of electric principle of the present utility model;

Fig. 2 is the electrical schematic diagram of current-voltage sampling module shown in Figure 1.

Among the figure: 1, power module; 2, display module; 3, data memory module; 4, central processing unit; 5, keyboard input circuit module; 6, clock circuit module; 7, precision computation chip; 8, current-voltage sampling module.

Embodiment

As shown in Figure 1, a kind of single loop direct current energy measurement instrument, it includes display module 2, data memory module 3, central processing unit 4, precision computation chip 7 and current-voltage sampling module 8, described current-voltage sampling module 8, obtain voltage signal with the linear optical coupling isolation, obtain current signal with shunt, and send voltage signal and current signal to precision computation chip 7; Described precision computation chip 7, measure in order to voltage signal and the current signal that will receive, and the voltage signal after will measuring and current signal send central processing unit 4 to, central processing unit 4 voltage signal and the current signal after according to metering calculates electrical energy parameter, and sends electrical energy parameter to display module 2 and show or store in the data memory module 3.Described central processing unit 4 also is connected with clock circuit module 6 and keyboard input circuit module 5.Central processing unit 4 used power modules 1 are battery.

The high precision Σ Δ analog to digital converter that described high-precision measuring chip is 24bit has been guaranteed the accuracy value of sampling, and has been guaranteed that the linearity of electric energy meter in the 1000:1 scope is better than 0.2%.Simultaneously peripheral sample circuit has been carried out optimal design, adopted resistance, electric capacity, the oscillator of a large amount of high-precision and high-stabilities, guaranteed that electric energy meter error deviation value in-30 ℃ to 70 ℃ temperature range is better than relevant national standard.

As shown in Figure 2, voltage sample part in the current-voltage sampling module: voltage sampling circuit uses linear optical coupling to isolate, the measuring accuracy height, linear stable, voltage is forward and reverse can be measured in order to make, adopt two TL431 that the voltage platform is risen 5V, computation chip is when making alive signal not, with this moment Vin+ as point of zero voltage, the VIN+ signal increases when adding forward voltage, and computation chip is as positive battery metering, when adding reverse voltage, the VIN+ terminal voltage signal reduces, and computation chip measures as negative voltage.

Current sample part: can get 0 ~ 75mV signal by shunt and directly insert electric current metering pin.

The utility model also has the RS485 interface, carries out exchanges data with microcomputer, follows the two agreements of DL/T645-1997 communications protocol and ModBus (RTU form).

Claims

1. single loop direct current energy measurement instrument, it is characterized in that: it includes display module (2), data memory module (3), central processing unit (4), precision computation chip (7) and current-voltage sampling module (8), described current-voltage sampling module (8), obtain voltage signal with the linear optical coupling isolation, obtain current signal with shunt, and send voltage signal and current signal to precision computation chip (7); Described precision computation chip (7), measure in order to voltage signal and the current signal that will receive, and the voltage signal after will measuring and current signal send central processing unit (4) to, voltage signal and the current signal of central processing unit (4) after according to metering calculates electrical energy parameter, and sends electrical energy parameter to display module (2) and show or store in the data memory module (3).

2. single loop direct current energy measurement instrument according to claim 1 is characterized in that: described central processing unit (4) also is connected with clock circuit module (6).

3. a kind of single loop direct current energy measurement instrument according to claim 1, it is characterized in that: described central processing unit (4) also is connected with keyboard input circuit module (5).

4. a kind of single loop direct current energy measurement instrument according to claim 1 is characterized in that: the used power module (1) of used central processing unit (4) is a battery.