CN2476822Y - DC power measurement device - Google Patents

Abstract

The utility model discloses a DC power measurement which is characterized in that DC voltage and current test signal are magnified by a cushion magnifier respectively and are transferred into digital signals by a simulation/signal conversion circuit; the signal coding are transferred into a seven segment display displayable code which goes through the display displaying metrical DC electricity data; the DC voltage and current test signal are transferred to a MPU to multiply the output power; the digital signals coding of the power is displayed the direct current power value by the display. The utility model achieves the DC electric power measurement and digitals display to let the common people know the actual electric power size of household electrical appliance.

Description

The DC power measurement device

The utility model relates to a kind of power meter, the DC power measurement device that particularly a kind of numeral shows.

In galvanic application, there is not the people that dc electric power is displayed in digitized mode always, because really belonging to, alternating current is difficult for, more talk direct current irresponsibly, yet direct current is in the future life field, its purposes should be able to more surpass alternating current, reason is except automobile, yacht, countries in the world are all at the electronic steam turbine car of design of rubbing one's fists and wipe one's palms, therefore, how to provide a kind of tool to measure dc electric power, and, be the technical difficulties place that this case institute desire solves with the digital form device shown.

Now use technical disadvantages:

1, do not have dc electric power is displayed in digitized mode.

2, the simulate electric energy meter that rotates of traditional disk pointer can't know clearly the actual electric power of the electrical appliance in the family.

3, do not have a progressive.

4, do not have a practicality.

5, do not have an industrial competitiveness.

In view of this, this case creator is professional attainment and the technical concept that is possessed with itself, through the improvement that studies repeatedly, this creation is born.

Primary and foremost purpose of the present utility model is that a kind of DC power measurement device is being provided, its fundamental purpose is with DC voltage, DC current and dc electric power, show with seven-segment display or LCD (LCD), allow the general common people can know clearly electrical appliance in the family to have consumed how many electric power altogether.

One above-mentioned purpose of the present utility model is realized by following technical scheme.

A kind of DC power measurement device is characterized in that:

One microprocessor, its fundamental purpose be with measured DC voltage and current value through the computing product, produce a direct current performance number;

One initial signal element, this start signal element mainly is made up of the power source conversion integrated circuit.Its input connects power supply, output connect respectively buffer amplifier U6A, U6B in microprocessing unit, the dc voltage and current detecting circuit, analog-to-digital signal circuit, and numeral change the seven-segment display unit; This start signal element is to transfer input voltage to 5 volts of voltage outputs, does the driving of integrated circuit;

One direct current voltage, current detection circuit comprise DC voltage detecting circuit and DC current detecting circuit two parts, form by detecting part and enlarging section branch; This DC voltage detects part and DC current detects input termination electrical appliance partly, and the DC voltage and the DC current that detect are amplified its signal damping via buffer amplifier U6A, U6B respectively; The output of buffer amplifier U6A, U6B connects CH0, the CH1 pin of analog-to-digital signal circuit;

One analog-to-digital signal circuit mainly is made up of mould/number conversion integrated circuit U10 and Zener diode U9, U8; Wherein, the negative electrode of Zener diode U9, U8 connects VRFF, the VDD pin of U10 respectively, and the CH0 of U10, CH1 pin connect the output of above-mentioned buffer amplifier U6A, U6B; The 8-11 pin of U10 connects RB5, RB4, RB7, the RB3 port of microprocessor, and connecing numeral by microprocessor changes seven-segment display unit 16; One reference voltage is provided and provides an analog/digital conversion voltage by Zener diode U9 by Zener diode U8, and the DC voltage and the DC current simulating signal of above-mentioned buffer amplifier U6A, U6B output are converted to DC voltage and DC current digital signal respectively, and adopt tandem moor and export numeral to and change the seven-segment display unit; Above-mentioned start signal unit then is connected to ground connection behind the 7th pin of this mould/number conversion integrated circuit U10 by resistance R 46;

One numeral is changeed the seven-segment display unit, comprise three groups of shift registor U1, U2, U3, shift registor U1, U2,1 of U3,2 pin connect the RB4 pin of microprocessor, 8 pin of U1 connect the RB0 port of microprocessor, 8 pin of U2 connect the RB1 port of microprocessor, 8 pin of U3 connect the RB2 port of microprocessor, it is with this DC voltage digital signal, the DC power digital signal that the DC current digital signal reaches via the microprocessor computing inputs to shift registor U1 respectively, U2 and U3, and transfer these three groups of digital signal encodings to seven-segment display and can show sign indicating number, shift registor U1, U2, the output of U3 connects display unit;

One display unit, it mainly comprises three groups of seven-segment displaies, is to show the numerical value of its DC voltage, DC current and DC power respectively; The COM0-COM3 pin of these three groups of seven-segment displaies meets the RA0-RA3 of microprocessor by the transistor matrix decoding scheme.

In specific implementation process, three groups of seven-segment displaies that wherein display unit comprised are liquid product displays.

Advantage of the present utility model is:

1, can show with seven-segment display or LCD (LCD) directly with DC voltage, DC current and dc electric power.

2, show with digital form, conveniently to read.

3, tool progressive.

4, its practicality.

5, value on tool industry and commerce and the industry.

Be convenient and understand content of the present utility model, and the effect that can reach, conjunction with figs. is enumerated a specific embodiment now, introduction is described as follows in detail:

Description of drawings:

Fig. 1 is a circuit block diagram of the present utility model.

Fig. 2 is a circuit diagram of the present utility model.

Fig. 3 is an action calcspar of the present utility model.

As shown in Figure 1 and Figure 2, a kind of DC power measurement device is to include:

One microprocessor 12, its fundamental purpose be with measured DC voltage and current value through the computing product, produce a direct current performance number.

One initial signal element 13, this start signal element 13 mainly is made up of by the power source conversion integrated circuit of LM7805 model.Its input connects power supply, output connect respectively buffer amplifier U6A, U6B in microprocessing unit 12, the dc voltage and current detecting circuit 14, analog-to-digital signal circuit 15, and numeral change seven-segment display unit 16.This start signal element 13 is input voltage to be transferred to-5 volts of voltage outputs, and the driving of circuit is used as a whole.

One direct current voltage, current detection circuit 14 comprise DC voltage detecting circuit and DC current detecting circuit two parts, form by detecting part and enlarging section branch; This DC voltage detects part and DC current detects input termination electrical appliance partly, will detect DC voltage and DC current and via buffer amplifier U6A, U6B its signal damping be amplified respectively, and can avoid differential mode loss and load effect to produce; The output of buffer amplifier U6A, U6B connects CH0, the CH1 pin of analog-to-digital signal circuit 15; In the present embodiment, the model of buffer amplifier U6A, U6B is MCP602.

One analog-to-digital signal circuit 15 mainly is made up of mould/number conversion integrated circuit U10 and Zener diode U9, U8, and the model of mould/number conversion integrated circuit U10 is MCP3204; Wherein, the negative electrode of Zener diode U9, U8 connects VRFF, the VDD pin of U10 respectively, and the CH0 of U10, CH1 pin connect the output of buffer amplifier U6A, U6B; The 8-11 pin of U10 connects RB5, RB4, RB7, the RB3 port of microprocessor, and connecing numeral by microprocessor changes seven-segment display unit 16; One reference voltage is provided and provides an analog/digital conversion voltage by Zener diode U9 by Zener diode U8, and the DC voltage and the DC current simulating signal of above-mentioned buffer amplifier U6A, U6B output are converted to DC voltage and DC current digital signal respectively, and adopt tandem moor and export numeral to and change seven-segment display unit 16.

One numeral is changeed seven-segment display unit 16, be to be 74164 shift registor U1 to comprise three groups of models, U2, U3, shift registor U1, U2,1 of U3,2 pin connect the RB4 pin of microprocessor, 8 pin of U1 connect the RB0 port of microprocessor, 8 pin of U2 connect the RB1 port of microprocessor, 8 pin of U3 connect the RB2 port of microprocessor, it is with this DC voltage digital signal, the DC power digital signal that the DC current digital signal reaches via the microprocessor computing inputs to shift registor U1 respectively, U2 and U3, and transfer these three groups of digital signal encodings to seven-segment display and can show sign indicating number, shift registor U1, U2, the output of U3 connects a display unit 17 respectively;

One display unit 17, it mainly comprises three groups of seven-segment displaies or LCD (LCD), is to show the numerical value of its DC voltage, DC current and DC power respectively; The COM0-COM3 pin of these three groups of seven-segment displaies meets the RA0-RA3 of microprocessor by the transistor matrix decoding scheme.

Used in the present embodiment model is JCC45, wherein three PORT of the RB0-RB3 of this microprocessor 12 (port) connect a shift registor U1 respectively, U2, U3, the RB4 pin that reaches by microprocessor 12 is connected to shift registor U1, U2, the 1st pin of U3, the 2nd pin, and this shift registor U1, U2, the Q0B-Q7B pin of U3 connects the Q0A-Q7A pin of corresponding seven-segment display respectively, this display unit (containing seven-segment display) then is connected to four PORT of RA0-RA3 (port) of microprocessor 12 by the COM0-COM3 pin, the RB5 of this microprocessor 12 again, RB4, RB7, the RB3 port then is connected to the 8-11 pin of IC (MCP3204) U10 of analog-to-digital signal circuit more respectively, and the 1st of this IC (MCP3204) U10,2 pin (CH0, CH1) then be connected to buffer amplifier U6A, the output terminal of U6B, this start signal unit 3 then are connected to ground connection behind the 7th pin of this IC (MCP3204) U10 by resistance R 46;

Please consult shown in Figure 3 again, it is DC voltage 1 to be detected part and DC current inspection 2 goes out part for the utility model, respectively via buffer amplifier U6A, after U6B amplifies 3 with its signal damping, transfer its simulating signal to digital signal 4 by A/D conversion circuit again, the digital signal that detects of the digital signal that detects of this DC voltage and DC current wherein, transfer its coding to seven-segment display and can show sign indicating number 6,7, and show DC voltage and the current values 9 that it is measured by seven-segment display respectively, 10, the digital signal of this DC voltage and electric current output is to deliver to microprocessor respectively again to take advantage of its output power 5 of calculation again, again the digital signal encoding of its output power is transferred to seven-segment display and can show sign indicating number 8, and show its DC power value 11 by a seven-segment display, yet can be simultaneously with DC voltage by the utility model, DC current and dc electric power, show with digital form with seven-segment display or LCD (LCD), the general common people can be known and read electrical appliance in the family easily, consumed how many electric power altogether? and can select the electrical appliance of more easily saving the energy for use, the tool practicality.

Because alternating current can be responded to C.T. and how many alternating currents be arranged (ampere), but there is not reliable part to respond to its direct current at direct current always, only, Hall element/principle is a feasible method, yet present patent application is not with Hall element/principle, but with the material behavior of metal, remove to calculate how many amperes (A) or power consumes, wherein utilize:

General resistance formula R=ρ * L/A

ρ: the resistance coefficient of metal material

L: the length of metal material

A: the cross-sectional area of metal material

Know ρ, L, the A of material, then can obtain R (resistance value);

After knowing V (voltage), be to utilize V=I * R

Can obtain I (being how many electric currents);

Utilize P=I * V again

Can obtain P (being the electric power value);

Be to lift a preferred embodiment, when the utility model is used in automobile or yacht, if we can know how many dc electric powers the storage battery of an automobile or yacht can produce, if cooperated this dc electric power table, when promptly can learn needs to recharge this storage battery, tool one convenience.

In sum, the utility model is being broken through under the previous technical pattern, has reached the effect that institute's desire is promoted really, also non-again be familiar with this skill person institute easily full of beard reach, have progressive, practicality.

Claims (2)

1, a kind of DC power measurement device is characterized in that:

One microprocessor, its fundamental purpose be with measured DC voltage and current value through the computing product, produce a direct current performance number;

One initial signal element, this start signal element mainly is made up of the power source conversion integrated circuit; Its input connects power supply, output connect respectively buffer amplifier U6A, U6B in microprocessing unit, the dc voltage and current detecting circuit, analog-to-digital signal circuit, and numeral change the seven-segment display unit; This start signal element is to transfer input voltage to 5 volts of voltage outputs, does the driving of integrated circuit; This start signal unit is connected to ground connection behind the 7th pin of this IC (MCP3204) U10 by resistance R 46;

One direct current voltage, current detection circuit comprise DC voltage detecting circuit and DC current detecting circuit two parts, form by detecting part and enlarging section branch; This DC voltage detects part and DC current detects input termination electrical appliance partly, and the DC voltage and the DC current that detect are amplified its signal damping via buffer amplifier U6A, U6B respectively; The output of buffer amplifier U6A, U6B connects CH0, the CH1 pin of analog-to-digital signal circuit;

One analog-to-digital signal circuit mainly is made up of mould/number conversion integrated circuit U10 and Zener diode U9, U8; Wherein, the negative electrode of Zener diode U9, U8 connects VRFF, the VDD pin of U10 respectively, and the CH0 of U10, CH1 pin connect the output of above-mentioned buffer amplifier U6A, U6B; The 8-11 pin of U10 connects RB5, RB4, RB7, the RB3 port of microprocessor, and connecing numeral by microprocessor changes seven-segment display unit 16; One reference voltage is provided and provides an analog/digital conversion voltage by Zener diode U9 by Zener diode U8, and the DC voltage and the DC current simulating signal of above-mentioned buffer amplifier U6A, U6B output are converted to DC voltage and DC current digital signal respectively, and adopt tandem moor and export numeral to and change the seven-segment display unit; Above-mentioned start signal unit then is connected to ground connection behind the 7th pin of this mould/number conversion integrated circuit U10 by resistance R 46;

One numeral is changeed the seven-segment display unit, comprise three groups of shift registor U1, U2, U3, shift registor U1, U2,1 of U3,2 pin connect the RB4 pin of microprocessor, 8 pin of U1 connect the RB0 port of microprocessor, 8 pin of U2 connect the RB1 port of microprocessor, 8 pin of U3 connect the RB2 port of microprocessor, it is with this DC voltage digital signal, the DC power digital signal that the DC current digital signal reaches via the microprocessor computing inputs to shift registor U1 respectively, U2 and U3, and transfer these three groups of digital signal encodings to seven-segment display and can show sign indicating number, shift registor U1, U2, the output of U3 connects display unit;

One display unit, it mainly comprises three groups of seven-segment displaies, is to show the numerical value of its DC voltage, DC current and DC power respectively; The COM0-COM3 pin of these three groups of seven-segment displaies meets the RA0-RA3 of microprocessor by the transistor matrix decoding scheme.

2, according to claim 1-kind of DC power measurement device, it is characterized in that: three groups of seven-segment displaies that wherein display unit comprised are LCD.

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