JP3086933U - DC power measurement device - Google Patents

Abstract

(57) [Problem] To provide a DC power measuring device capable of digitizing and displaying DC power. After amplifying a signal of a DC voltage detecting portion and a signal of a DC current detecting portion by a buffer amplifier, respectively,
A digital conversion circuit converts an analog signal into a digital signal, converts the code of the digital signal for detecting the DC voltage and the DC current into a code that can be displayed on a seven-stage display, and displays a numerical value. Are respectively sent to the microprocessor, the power is integrated, and the digital signal code of the output power is
The code is converted to a code that can be displayed on a step display, and the DC power value is displayed on a seven-step display.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a DC power measuring device, which mainly displays DC voltage, DC current and DC power on a seven-stage display or an LCD (Liquid Crystal Display), so that ordinary people can consume as much power as home appliances. Related to a device that can easily know whether or not

[0002]

[Prior art]

 During the ordinary life, only the AC electricity AC power meter (kilowatt / hour) can be seen, and it is installed in ordinary household electricity meters and the like, and the meter is based on an analog system such as a disk type meter. Some readers read how much electricity was used in the month.

[0003]

[Problems to be solved by the invention]

 However, in the above-described known structure, it is not possible to know in detail how much electric power such as a computer, a rice cooker, or a cooler has used, which is inconvenient. Also, within the application range of DC electricity, there is still nothing that can be displayed by digitizing DC power, and it is difficult to digitize and display it with AC electricity. It is extremely difficult to do this, but it can be said that in the future, the number of things used in daily life will be further increased by direct current electricity (for example, cars and cruisers). Therefore, the present invention provides a DC power measuring device capable of digitizing and displaying DC power.

[0004]

[Means for Solving the Problems]

 After the signals of the DC voltage detection section and the DC current detection section are respectively amplified by the buffer amplifier, the analog signal is converted into a digital signal by an analog / digital conversion circuit, and the digital signal of the DC voltage detection and the DC current detection are converted. The digital signal code is converted into a code that can be displayed on a seven-stage display, and the measured DC voltage and current values are displayed on the seven-stage display. And the power is integrated, the digital signal code of the power is converted into a code that can be displayed on a seven-stage display, and finally the DC power value is displayed on the seven-stage display.

[0005]

[Embodiment of the invention]

 As shown in FIGS. 1 and 2, the present invention mainly includes a microprocessor 12, a start signal unit 13, a buffer amplifier circuit 14, and a circuit 15 for converting an analog signal to a digital signal. The main purpose of the microprocessor 12 is to generate a DC power value by calculating and integrating the measured DC voltage and current value. In the start signal unit 13, the input voltage is converted to an output of a voltage of 5 volts, and is used for driving the entire circuit. The buffer amplification circuit 14 includes two sets of buffer amplifiers U6A and U6B, of which a DC voltage detection unit and a DC current detection unit buffer and amplify the signal via the buffer amplifiers U6A and U6B, respectively, to obtain differential mode loss and Prevent load effects from occurring.

A circuit 15 for converting an analog signal to a digital signal is provided with a reference voltage by a zener diode U9, and is provided with an analog / digital conversion voltage by a zener diode U8, and is supplied with a DC voltage output by the buffer amplifiers U6A and U6B. The voltage and DC current analog signals are converted to DC voltage and DC current digital signals, respectively, and output in a tandem manner to a circuit 16 for converting the digital into a seven-stage display.

[0007] The circuit 16 for converting the digital into a seven-stage display includes three sets of shift working memories, and shifts the DC voltage digital signal, the DC current digital signal, and the DC power digital signal calculated through the microprocessor, respectively. The signals are input to king memories U1, U2, and U3, and the three sets of digital signal codes are converted into codes that can be displayed on a seven-stage display. The display unit 17 is mainly composed of three sets of seven-stage display or LCD (Liquid Crystal Display), and displays DC voltage, DC current and DC power, respectively.

As shown in FIG. 3, the DC voltage detection (1) part and the DC current detection (2) part are respectively subjected to the buffer amplification (3) via buffer amplifiers (U6A, U6B), and then further The analog signal is converted into a digital signal by an analog / digital conversion circuit (4), and the digital signal of the DC voltage detection and the digital signal of the DC current detection are converted into codes (6, 7) whose codes can be displayed on a seven-stage display. ), And the numerical values (9, 10) of the measured DC voltage and current are displayed on the seven-stage display, and the digital signals of the DC voltage and current output are sent to the microprocessor, respectively. The output power is integrated, and the digital signal code of the output power is converted into a code that can be displayed on a seven-stage display (8). Display the DC power value through a spray (11).

The present invention achieves a display of power consumption and the like that can be easily understood by ordinary people by simultaneously displaying a DC voltage, a DC current, and a DC power on a seven-stage display or a display system digitized by an LCD. You.

[0010] In the case of AC electricity, the value of amperage is detected by CT, but in DC electricity, there is no such value. Therefore, the only method using the Hall principle was used. Rather than using the characteristics of the metal material to calculate how much amperage and power are currently consumed, the general resistance formula is R = ρ x L / A (where ρ is the resistance coefficient of the metal material and L is the metal material). Once the length of A, A is the surface area of the metal material), ρ, L, and A of the material can be obtained, R (resistance) can be obtained, and after V (voltage) is known, use the formula of V = I x R Thus, I (current value) is obtained, and P (power value) is obtained by using P = I × V.

By doing so, the present invention is used in, for example, automobiles and cruisers, and it can be understood how much DC power can be generated by a battery, and if a DC power meter is combined, , You can know when to charge.

[0012]

[Effect of the invention]

 According to the present invention, the DC voltage, DC current, and DC power are digitized and displayed on a seven-stage display or LCD, etc., instead of the conventional disk-type meter, making it easy for ordinary users to understand. The goal has been achieved.

[Brief description of the drawings]

FIG. 1 is a circuit block chart of the present invention.

FIG. 2 is a circuit diagram of the present invention.

FIG. 3 is an operation block chart of the present invention.

[Explanation of symbols]

1 DC voltage detection 2 DC current detection 3 Buffer amplification 4 Convert analog signal to digital signal 5 Integrate output power 6 Convert digital signal code detected by DC voltage to code that can be displayed on 7-stage display 7 Digital detected by DC current Convert the signal code to a code that can be displayed on a 7-level display 8 Convert the digital signal code for output power to a code that can be displayed on a 7-level display 9 Display the measured DC voltage 10 Display the measured DC current 11 DC power value 12 Microprocessor 13 Start signal unit 14 Buffer amplifier circuit 15 Circuit for converting analog to digital signal 16 Circuit for converting to digital 7-stage display 17 Display unit U6A, U6B Buffer amplifier U8, U9 Zener diode U1, U2, U3 Shift working memory

Claims (2)

[Utility model registration claims] 1. A DC power measuring device comprising a microprocessor, a buffer amplifier circuit, a circuit for converting an analog signal to a digital signal, a unit for converting a digital signal to a seven-stage display, and a DC power measuring device having a display unit. Is calculated by
It includes a microprocessor for generating a DC power value and two sets of buffer amplifiers. The DC voltage detection part and the DC current detection part are buffer-amplified through the two sets of buffer amplifiers, respectively, to provide differential mode loss and load. A buffer amplifier circuit that does not generate an effect, a reference voltage is provided by a zener diode and an analog / digital conversion voltage is provided by another zener diode, and a DC voltage and a DC current analog signal output by the two sets of buffer amplifiers are respectively DC. A circuit for converting analog to digital signals, which is converted to digital signals of voltage and DC current and output to a unit for converting digital to 7-stage display in tandem, and a shift working memory, including DC voltage digital signals and DC Current digital signal and microprocessor DC power digital signal calculated Te is input to the respective three pairs of shift working memory,
A unit for converting the three sets of digital signal codes into codes that can be displayed on a seven-level display; a unit for converting digital into a seven-level display; and three sets of seven-level displays or a liquid crystal display. A DC power measuring device, comprising: a display unit that displays a value of power. 2. The direct current power measuring apparatus according to claim 1, wherein the number of consumed amperage and electric power are calculated by utilizing characteristics of the metal material.