CN203350336U

CN203350336U - Multi-function voltage frequency table

Info

Publication number: CN203350336U
Application number: CN 201320418467
Authority: CN
Inventors: 刘盛安
Original assignee: PINGYANG KIM KUN ELECTRICAL EQUIPMENT Co Ltd
Current assignee: PINGYANG KIM KUN ELECTRICAL EQUIPMENT Co Ltd
Priority date: 2013-07-15
Filing date: 2013-07-15
Publication date: 2013-12-18
Anticipated expiration: 2023-07-15

Abstract

The invention provides a multi-function voltage frequency table which includes a single-chip microcomputer for data processing, an input circuit for data input, a power supply circuit for power supply and a display circuit for data display. The input circuit, the single-chip microcomputer and the display circuit are sequentially connected. The input circuit includes a voltage detection circuit and a frequency detection circuit. The single-chip microcomputer is in external connection with a time base circuit. The display circuit comprises a display screen. According to the utility model, through the voltage detection circuit, a detected voltage value is displayed on the display circuit through the single-chip microcomputer, the number of pulses of the detected signal to be detected by the frequency detection circuit in a unit time is also counted through the single-chip microcomputer and the time base circuit, and then a frequency value is displayed in a digital form on the display circuit to achieve frequency, voltage and detection display.

Description

The multifunctional electric frequency meter

Technical field

The utility model relates to electronic instrument technology field, is specifically related to a kind of multifunctional electric frequency meter.

Background technology

Voltage table is a kind of instrument of measuring voltage, and frequency meter is a kind of electronic measuring instrument of specially the measured signal frequency being measured, at present in the time of needs detection voltage and frequency, need to respectively voltage table be installed and frequency meter is detected, not only loaded down with trivial details but also take up room.

The utility model content

In order to solve the deficiency of above-mentioned technology, the purpose of this utility model is to provide a kind of multifunctional electric frequency meter, its can survey frequency again can measuring voltage, solved the deficiency that current function of voltmeter is single.

The utility model solves the technical scheme that its technical matters adopts:

A kind of multifunctional electric frequency meter, it comprises for the single-chip microcomputer of data processing, for the input circuit of data input, for the power circuit that power supply is provided and the display circuit shown for data, described input circuit, single-chip microcomputer and display circuit are connected successively, described input circuit comprises voltage detecting circuit and frequency detection circuit, the external time base circuit of described single-chip microcomputer, described display circuit comprises display screen;

In the unit period provided at time base circuit, the umber of pulse that single-chip microcomputer statistical frequency testing circuit detects also is converted into frequency values, and shows in digital form on display screen;

After the magnitude of voltage digital-to-analogue that single-chip microcomputer detects voltage detecting circuit transforms, on display screen, show in digital form.

Preferably, described single-chip microcomputer adopts the N79E814AS single-chip microcomputer.

Preferably, described voltage detecting circuit is bleeder circuit.

Preferably, described frequency detection circuit adopts optically coupled circuit, and the alternating current input connects the anode of the light-emitting diodes pipe end of photo-coupler, its plus earth, and the grounded emitter of the switching tube of described photo-coupler, its collector connects single-chip microcomputer.

Preferably, described power circuit adopts the mu balanced circuit that voltage stabilizing chip and rectifier bridge form.

Preferably, described time base circuit comprises crystal oscillator, and the frequency of described crystal oscillator is 12MHz.

Preferably, described multifunctional electric frequency meter is provided with the light emitting diode be used to indicate, and described light emitting diode is connected with display screen.

Preferably, described display screen is LED display.

Preferably, described multifunctional electric frequency meter is provided with the reset switch for reset operation.

The beneficial effects of the utility model are, pass through voltage detecting circuit, detecting magnitude of voltage shows on display circuit by single-chip microcomputer, and by single-chip microcomputer and time base circuit in the unit interval, the umber of pulse of the measured signal that frequency detection circuit detects is counted, then in digital form frequency values is shown on display circuit, realize frequency, voltage detection display simultaneously.

The accompanying drawing explanation

Fig. 1 is the circuit theory diagrams of single-chip microcomputer of the present utility model, display circuit and time base circuit.

Fig. 2 is the circuit theory diagrams of input circuit of the present utility model and power circuit.

Embodiment

Below in conjunction with accompanying drawing, the utility model is further illustrated:

Referring to Fig. 1 and Fig. 2, the utility model comprises for the single-chip microcomputer 1 of data processing, for the input circuit of data input, for the power circuit that power supply is provided and the display circuit shown for data, described input circuit, single-chip microcomputer 1 are connected successively with display circuit, described input circuit comprises voltage detecting circuit 8 and frequency detection circuit 6, the external time base circuit for time counting 3 of described single-chip microcomputer 1, described display circuit adopts LED display 2;

In the unit interval of time base circuit 3 input single-chip microcomputers 1, the umber of pulse that single-chip microcomputer 1 statistical frequency testing circuit 6 detects shows in digital form on LED display 2;

After the magnitude of voltage digital-to-analogue that single-chip microcomputer 1 detects voltage detecting circuit 8 transforms, on display screen 2, show in digital form.

Preferably, described single-chip microcomputer 1 adopts the N79E814AS single-chip microcomputer, and this single-chip microcomputer is 8 51 microcontrollers of enhancement mode, and the storer EPROM of embedded 8K, can be by general fever writes, and the ICP programmable device, carry the burning programs such as ISP function.The instruction set of N79E814A series and standard 8052 compatibilities.N79E814A internally stored program space is respectively the APROM of 8K byte, the LDROM of the datarams of 4K byte and 2K byte; Direct and the indirect RAM of 256 bytes, 256 byte MOVX RAM; But the I/O mouth of 25 bit addressings; The timer/counter of two 16-positions; 8-passage multichannel 10-position A/D converter; 4-path 10-position PWM; Three serial line interfaces are respectively a SPI, an I2C and an enhanced serial port; 2-level BOD voltage detecting/reset, low pressure detects/resets (LVR) and electrification reset (POR).N79E814A series carries inner 22.1184MHz RC oscillator, can produce the inner crystal oscillator of 22.1184MHz/11.0592MHz, full accuracy deviation only 1%.N79E814A has 14 interrupt sources, 4 interrupt leveles.Inner erasable the writing of flash memories.Once code is definite, the user can protect by security code the code of oneself.N79E814A microcontroller series, wide voltage-operated, built-in abundant analog-and digital-peripheral hardware and non-volatile flash memory storer, be widely used in the general controls field, DC/BLDC motor driven systems and household electrical appliances application.

As shown in Figure 2, described voltage detecting circuit 8 is bleeder circuit, connect with Gather and input voltage in parallel and be connected with 20 pin of single-chip microcomputer 1 by connection terminal CON4 by resistance, by 1 pair of magnitude of voltage detected of single-chip microcomputer, through the built-in digital to analog converter of single-chip microcomputer self, convert its measuring voltage value to digital form and show on LED display 2.

Preferably, described frequency detection circuit 6 adopts optically coupled circuit, and the alternating current input connects the anode of the light-emitting diodes pipe end of photo-coupler, its plus earth, the grounded emitter of the switching tube of described photo-coupler, its collector connects single-chip microcomputer 1, and it controls the conducting of the light emitting diode of photo-coupler by the variation of alternating current, thereby make the switching tube conducting of photo-coupler, in the unit interval that single-chip microcomputer is provided at time base circuit, record the number of times of switching tube conducting, realize step-by-step counting.

As shown in Figure 2, the mu balanced circuit that described power circuit adopts voltage stabilizing chip 5 and rectifier bridge 4 to form, be input to successively again the input end of voltage stabilizing chip 5 by the stabilivolt voltage stabilizing by the filtering of electrochemical capacitor and electric capacity after 8.2V after rectifier bridge 4 rectifications that alternating current forms by 4 diodes, described voltage stabilizing chip 5 adopts 78L05 voltage stabilizing chip, the magnitude of voltage of input degree input is stabilized in to 5V output, and output voltage is powered to the utility model.

Preferably, described time base circuit 3 comprises crystal oscillator, and the frequency of described crystal oscillator is 12MHz, adopts the electric capacity of 12Pf to carry out starting of oscillation to crystal oscillator, guarantees the time precision of single-chip microcomputer, makes frequency counting more accurate, meets high-precision demand.

Preferably, described multifunctional electric frequency meter is provided with the light emitting diode be used to indicate, and described light emitting diode is connected with LED display 2, adopts light emitting diode to be detected the duty of LED display 2, guarantees the normal operation of LED display 2.

Preferably, described multifunctional electric frequency meter is provided with the reset switch 7 for reset operation, and reset switch 7 is connected with the resetting pin of single-chip microcomputer 1, provides reset signal to single-chip microcomputer 1, makes it to the data that store, carry out clear operation.

The utility model is detected current input voltage value respectively by voltage detecting circuit 8 and frequency detection circuit 6, by 1 pair of data that detect of single-chip microcomputer, processed respectively, show respectively magnitude of voltage and frequency values on LED display 2, make voltage table can detect voltage and can carry out frequency detecting again.

Embodiment should not be considered as restriction of the present utility model, but any improvement of doing based on spirit of the present utility model, all should be within protection domain of the present utility model.

Claims

1. a multifunctional electric frequency meter, it comprises for the single-chip microcomputer (1) of data processing, for the input circuit of data input, for the power circuit that power supply is provided and the display circuit shown for data, described input circuit, single-chip microcomputer (1) are connected successively with display circuit, it is characterized in that: described input circuit comprises voltage detecting circuit (8) and frequency detection circuit (6), the external time base circuit of described single-chip microcomputer (1) (3), described display circuit comprises display screen (2);

In the unit period provided at time base circuit (3), the umber of pulse that single-chip microcomputer (1) statistical frequency testing circuit (6) detects also is converted into frequency values, and (2) show in digital form on display screen;

After the magnitude of voltage digital-to-analogue that single-chip microcomputer (1) detects voltage detecting circuit (8) transforms, on display screen (2), show in digital form.

2. multifunctional electric frequency meter according to claim 1, is characterized in that, described single-chip microcomputer (1) adopts the N79E814AS single-chip microcomputer.

3. multifunctional electric frequency meter according to claim 1, is characterized in that, described voltage detecting circuit (8) is bleeder circuit.

4. multifunctional electric frequency meter according to claim 1, it is characterized in that, described frequency detection circuit (6) adopts optically coupled circuit, the alternating current input connects the anode of the light-emitting diodes pipe end of photo-coupler, its plus earth, the grounded emitter of the switching tube of described photo-coupler, its collector connects single-chip microcomputer (1).

5. multifunctional electric frequency meter according to claim 1, is characterized in that, the mu balanced circuit that described power circuit adopts voltage stabilizing chip (5) and rectifier bridge (4) to form.

6. multifunctional electric frequency meter according to claim 1, is characterized in that, described time base circuit (3) comprises crystal oscillator, and the frequency of described crystal oscillator is 12MHz.

7. multifunctional electric frequency meter according to claim 1, is characterized in that, described multifunctional electric frequency meter is provided with the light emitting diode be used to indicate, and described light emitting diode is connected with display screen.

8. according to the described multifunctional electric frequency meter of claim 1 or 7, it is characterized in that, described display screen is LED display (2).

9. multifunctional electric frequency meter according to claim 1, is characterized in that, described multifunctional electric frequency meter is provided with the reset switch (7) for reset operation.