CN204832345U

CN204832345U - Digital phase measurement appearance

Info

Publication number: CN204832345U
Application number: CN201520396929.0U
Authority: CN
Inventors: 李永琪; 李劲松
Original assignee: China Jiliang University
Current assignee: China Jiliang University
Priority date: 2015-06-08
Filing date: 2015-06-08
Publication date: 2015-12-02
Anticipated expiration: 2025-06-08

Abstract

The utility model discloses a digital formula phase measurement appearance, including shaping circuit module, phase place measured module, frequency measured module, keyboard and display module. The shaping circuit module, its characterized in that circuit includes two schmidt trigger. Schmidt trigger comprises the opposite ware of two -stage CMOS. Phase place measured module, its characterized in that include the AD sampling function unit branch of two RS triggers and singlechip. Frequency measured module, its characterized in that include two 16 digit counters of C51 singlechip, timer and arithmetic logical unit.

Description

A kind of digital phase tester

Technical field

The utility model belongs to electronic technology field, relates to a kind of digital phase measurement device.

Background technology

In recent years, along with the development of science and technology, a lot of surveying instrument develops to " intelligent instrument " and " Auto-Test System " gradually, digital phase measuring instrument is the common instrument in electronic surveying field, phase measurement is applied to national defence, research and production every field, has important meaning to life and scientific research aspect, in such as line of electric force Two-Way Automatic Communication System, sending and receiving end is if any voltage phase difference, causes during Signal reception and occurs that deviation can have a strong impact on communication performance.So we to the requirement of phase measurement also progressively to high precision, the future development of high intelligence.Traditional instrumented is such as all more difficult with the phase circuit debugging of the measuring instrument of the AD-Y series of variable prolongation collimation method, and traditional simulated pointer formula instrument obviously can not meet required accuracy requirement.The universal of microcomputer exactly can address these problems, so native system uses medium scale integration (MSI), and single-chip microcomputer, it is simple that keyboard and display realize a principle, measuring accuracy is high, and degree of stability is good, the phase measurement frequency recorder that measurement result can directly be revealed.

Utility model content

The utility model proposes a kind of device that can facilitate Measurement accuracy same-frequency signal phase difference for problems of the prior art, and concrete scheme is as follows:

A kind of digital phase measuring instrument, comprises shaping circuit module, phase measurement module, frequency measuring block, keyboard and display module.Described shaping circuit module, it is characterized in that circuit comprises two Schmidt triggers, described Schmidt trigger is made up of the contrary device of two-stage CMOS.Described phase measurement module, is characterized in that the AD sampling functions part comprising two rest-set flip-flops and single-chip microcomputer.Described frequency measuring block, is characterized in that two 16 digit counters, timer and arithmetic logical units comprising C51 single-chip microcomputer.

In such scheme, use two Schmidt triggers be made up of the contrary device of two-stage CMOS, carry out shaping to two paths of signals, be about to be shaped as square wave with frequency sine-wave, Schmidt trigger introduces positive feedback network on the basis of simple gate voltage limit comparer.Due to the effect of positive feedback, its threshold voltage changes along with the change of output voltage Uo, therefore improves antijamming capability.

Two row are received two trigger input of trigger flip-flop (rest-set flip-flop) by described phase measurement part with frequency square-wave signal.When the pulse of first row signal arrives, output is put 1, when secondary series signal arrives, output is set to 0, so just phase differential is converted to the dutycycle of output signal.Dutycycle from 0 ~ 1, with regard to corresponding phase difference from 0 ° ~ 360 °.Again by dutycycle rectification, form DC voltage, and the size of voltage just correspond to the size of dutycycle, i.e. phase place extent.With 16 A/D, numerical monitor is carried out to DC voltage sampling, so just phase differential is shown in digital form.Due to 360 ° of phase differential have been carried out 2 ¹⁶portioning, this just makes measuring accuracy very high, is less than 0.1 °.

Described C51 single-chip microcomputer has timer/counter T1 and T0 of two 16, utilizes timer T0 to measure the cycle by controlling functions, and week can be calculated ability and the cycle can be converted into frequency by the data operation ability of single-chip microcomputer, realizes the equally accurate display of measurement result.It is synchronous with the hopping edge of measured signal that the external interrupt function of single-chip microcomputer can realize knife switch easily.

Compared with prior art, the utility model tool has the following advantages:

A kind of digital phase tester of the present utility model, utilizes the high precision of single-chip microcomputer and two kinds of triggers, and high stability is surveyed, and the feature of liquid crystal display display high-acruracy survey result, makes measuring instrument have simple to operate, hold wield advantage.

Accompanying drawing explanation

Fig. 1 is a kind of digital phase tester general structure block diagram of the utility model embodiment;

Fig. 2 is a kind of digital phase tester shaping circuit figure of the utility model embodiment;

Fig. 3 is a kind of digital phase tester phase test partial circuit figure of the utility model embodiment;

Fig. 4 is a kind of digital phase tester single chip circuit figure of the utility model embodiment;

Fig. 5 is a kind of digital phase tester main program flow chart of the utility model embodiment;

Fig. 6 is a kind of digital phase tester phase measurement modular program process flow diagram of the utility model embodiment;

Fig. 7 is a kind of digital phase tester frequency measuring block program flow diagram of the utility model embodiment;

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail.Be described in further detail the present invention below in conjunction with accompanying drawing, following examples are the reasonable application forms of the present invention, but following examples should not regard limitation of the present invention as.

Be illustrated in figure 1 the schematic diagram of a kind of digital phase metering circuit of the utility model embodiment, Fig. 2 is shaping circuit circuit diagram, and being connected on the Fig. 3 after Fig. 2 is rest-set flip-flop circuit, and Fig. 4 is single-chip microcomputer internal circuit.

A kind of digital phase metering circuit of said structure, during beginning, two row are accessed shaping circuit with frequency power frequency component, signal is shaped as square wave by sinusoidal signal, after access rest-set flip-flop, access single-chip microcomputer, measures phase place by programmed control 16 AD, T0, T1, arithmetic block draws frequency data, finally reaches liquid crystal display display.

Above-described embodiment has been described in detail the technical solution of the utility model and beneficial effect; be understood that and the foregoing is only most preferred embodiment of the present utility model; be not limited to the utility model; all make in spirit of the present utility model any amendment, supplement and equivalent to replace, all should be included within protection domain of the present utility model.

Claims

1. a digital phase measuring instrument, comprises shaping circuit module, phase measurement module, frequency measuring block, keyboard and display module.Described shaping circuit module, it is characterized in that circuit comprises two Schmidt triggers, described Schmidt trigger is made up of the contrary device of two-stage CMOS.Described phase measurement module, is characterized in that the AD sampling functions part comprising two rest-set flip-flops and single-chip microcomputer.Described frequency measuring block, is characterized in that two 16 digit counters, timer and arithmetic logical units comprising C51 single-chip microcomputer.

2. a kind of digital phase measuring instrument according to claim 1, it is characterized in that: the Schmidt trigger that described shaping circuit module comprises, be shaped to circuit and square-wave by with sinusoidal current frequently, and described Schmidt trigger introduces positive feedback network on the basis of simple gate voltage limit comparer.

3. a kind of digital phase measuring instrument according to claim 1, it is characterized in that: described phase measurement modular circuit includes 16 A/D of rest-set flip-flop and single-chip microcomputer, signal phase difference can be converted to dutycycle by described rest-set flip-flop, and single-chip microcomputer 16 A/D (8) can sample carries out numerical monitor.

4. a kind of digital phase measuring instrument according to claim 1, it is characterized in that: described frequency measuring block circuit includes timer/counter T1 and T0 and the arithmetic logical unit of single-chip microcomputer two 16, steady arm/counter T1 and T0 of described 16 can measure the cycle of two column signals, and periodic conversion can be frequency by arithmetic logical unit.