CN202854185U - Square-wave signal generator for measuring resonant frequency of resonance grounding net - Google Patents
Square-wave signal generator for measuring resonant frequency of resonance grounding net Download PDFInfo
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- CN202854185U CN202854185U CN201220460855.9U CN201220460855U CN202854185U CN 202854185 U CN202854185 U CN 202854185U CN 201220460855 U CN201220460855 U CN 201220460855U CN 202854185 U CN202854185 U CN 202854185U
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Abstract
The utility model relates to a square-wave signal generator for measuring the resonant frequency of a resonance grounding net, which is technically characterized by comprising a single-chip microcomputer control module, a power module and a square-wave signal generating module. The input end of the power module is connected with the 220V AC power supply, and the output end of the power module is respectively connected with the single-chip microcomputer control module and the square-wave signal generating module to provide power for the single-chip microcomputer control module and the square-wave signal generating module respectively. The single-chip microcomputer control module is connected with the square-wave signal generating module to control the square-wave signal generating module to output square-wave signals of a certain frequency. Four inverters, four photoelectric couplers, four drive circuits, four IGBTs and auxiliary circuits thereof are connected together to form the square-wave signal generating module. The square-wave signal generator has the advantages of reasonable design, large signal power, stable performance and the like, and can be manually adjusted. Meanwhile, both the frequency and the voltage amplitude of signals generated by the above square-wave signal generator are wide in adjustment range, and the anti-interference capability of the circuit is improved. Therefore, the square-wave signal generator can be widely used for measuring the resonant frequency of a resonance grounding net in the electric power system.
Description
Technical field
The utility model belongs to the square wave signal generator field, especially a kind of square wave signal generator for the measurement of resonance grounding net resonance frequency.
Background technology
The neutral by arc extinction coil grounding electrical network claims again resonance grounding net.When resonance grounding net generation singlephase earth fault, arc suppression coil provides an inductive current, can compensate the electric current that resonance grounding net three-phase transmission line ground capacitance produces, and the ground connection residual flow is reduced, and the voltage at fault phase ground arc two ends is reduced rapidly, thereby electric arc is easy to from putting out.When measuring the resonance frequency of resonance grounding net, need to use powerful square-wave signal generating means and carry out frequency sweep, yet the signal that existing signal source is sent is fainter, and its frequency range is subjected to the restriction of components and parts in the auto levelizer, brought difficulty for the measurement of resonance frequency, even can produce rub-out signal and affect the reliability service of electric system.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and the square wave signal generator that the resonance grounding net resonance frequency is measured that is used for that a kind of signal power is large, antijamming capability is strong and reliability is high is provided.
The utility model solves its technical matters and takes following technical scheme to realize:
A kind of square wave signal generator for the measurement of resonance grounding net resonance frequency, comprise single chip control module, power module and square-wave signal generation module, the input end of power module is connected with the 220V AC power, its output terminal is connected with single chip control module and square-wave signal generation module respectively and is respectively its power supply, single chip control module is connected with square-wave signal generation module, this square wave signal generating module is by four phase inverters, four photoelectric couplings, four driving circuits and four IGBT and auxiliary circuit thereof connect and compose, four phase inverters are connected for the isolated high voltage signal with four I/O interfaces of single-chip microcomputer, thereby four IGBT pipe and auxiliary circuit thereof are divided into two groups of regularly conductings and cut-off output square-wave signals under the control of single chip control module.
And described single chip control module also connects amplitude, frequency and the dutycycle that a manual adjustment module is used for the regulation output square-wave signal.
And described single chip control module also connects amplitude, frequency or the dutycycle that a display module is used for showing square-wave signal.
And described single chip control module comprises single chip computer AT 89C51 chip, peripheral circuit and A/D converter.
And described power module comprises voltage-adjustable power module and 5V power module, and this voltage-adjustable power is connected and composed by autotransformer, bridge rectifier circuit and RC circuit and is square-wave signal generation module for power supply; Described 5V power module is connected and composed by transformer and rectification stable pressuring unit and is that single chip control module is powered.
And described demonstration output module is made of six eight segment numeral pipes.
Advantage of the present utility model and good effect are:
The utility model adopt the IGBT pipe be applicable to high-frequency circuit as switching device and by the manual adjustments module to the frequency of output, duty when voltage magnitude regulate and show by display module, overcome the weak shortcoming of signal energy of existing square wave signal generator, between single-chip microcomputer and optocoupler, phase inverter is set, strengthened the antijamming capability of circuit, but have that signal power is large, a frequency and the voltage magnitude range of adjustment is wide and the characteristics such as manual adjustments, stable performance, can be widely used in during electric system resonance grounding net resonance frequency measures.
Description of drawings
Fig. 1 is circuit block diagram of the present utility model;
Fig. 2 is power module of the present utility model and square-wave signal generation module circuit diagram;
Fig. 3 is single chip control module of the present utility model and display module circuit diagram;
Fig. 4 is Single Chip Microcomputer (SCM) program processing flow chart of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
A kind of square wave signal generator for the measurement of resonance grounding net resonance frequency, as shown in Figure 1, comprise single chip control module, power module, square-wave signal generation module, manual adjustments module and display module, the input end of power module is connected with the 220V AC power, its output terminal is connected with single chip control module and square-wave signal generation module respectively and is respectively its power supply, this single chip control module comprises single chip computer AT 89C51 chip and coupled peripheral circuit, A/D converter, single chip control module respectively with square-wave signal generation module, the be connected square-wave signal of control square wave signal generating module output certain frequency and show by display module of display module, single chip control module is connected with the manual adjustments module and realizes adjusting square-wave output signal function.
As shown in Figure 2, power module comprises voltage-adjustable power module and 5V power module, and the external 220V alternating current of power module is on the one hand through the variation of automatic coupling voltage regulator by manual knob control output square-wave voltage amplitude; Produce 5V direct current supply AT89C51 single-chip microcomputer and MAX187 use through transformer and rectification stable pressuring unit on the other hand.Wherein, voltage-adjustable power comprises autotransformer, bridge rectifier circuit and RC circuit, the main limit of this autotransformer is connected with 220 AC power, its secondary is by behind the bridge rectifier circuit, obtain a square-wave signal generation circuit power supply that substantially remains on the DC voltage of 50V～200V by the RC circuit again, this direct current is exported the square wave of this voltage magnitude as the power supply of 4 IGBT built-up circuits by the turn-on and turn-off of control IGBT; The 5V power supply is made of transformer and rectification stable pressuring unit, and the main limit of this transformer is connected with 220 AC power, its secondary by rectification stable pressuring unit after output 5V power supply be the single chip control module power supply.
As shown in Figure 2, square-wave signal generation module comprises four phase inverters, four photoelectric couplings, four driving circuits and four IGBT and auxiliary circuit thereof.Four the I/O interfaces (P1.1, P1.2, P1.3 and P1.4) of single chip computer AT 89C51 in four phase inverters and the single chip control module are the isolated high voltage signal effectively, plays the effect of protection single-chip microcomputer.Four photoelectric couplings provide the electrical isolation of two terminal circuits.Because IGBT combines the advantage of MOSFET and GTR, and have that contact capacity is large, on-state loss is low, switching loss is low, control easily advantage, therefore choose IGBT as switching device, four IGBT pipe and auxiliary circuit thereof are divided into two groups of regularly conductings and cut-offs under the control of AT89C51, the IGBT in the upper left corner and lower right corner pipe and auxiliary circuit thereof are one group among the figure, two other IGBT pipe and auxiliary circuit thereof are one group, then cut-off of another group when wherein one group of IGBT manages conducting, and it is equal to control the duration that makes conducting and cut-off by AT89C51.Its principle of work is: P1.1 and P1.4 send signal controlling IGBT1 and IGBT4 conducting, and output terminal can obtain high level E under the effect of DC voltage E, and IGBT1 and IGBT4 ON time are denoted as t
OnSend signal controlling IGBT2 and IGBT3 conducting by single-chip microcomputer P1.2 and P1.3, output terminal can obtain low level-E under the effect of DC voltage E, and IGBT2 and IGBT3 ON time are denoted as t
Off, the cycle that then obtains square wave is T=t
On+ t
Off, dutycycle is
In the situation that do not regulate the dutycycle knob, acquiescence output t
On=t
OffIt is the square wave of α=0.5.By detecting the regulated quantity of knob, control P1.1～P1.4 pin finally obtains the waveform of required frequency.Because the switching speed of electric power IGBT is fast, high, the high-power advantage of frequency of operation can produce the frequency adjustable extent wide, high-power square-wave signal, and then be applied in the measurement of resonance grounding net resonance frequency.
The manual adjustments module comprises a waver and three adjusting knobs.Waver mainly is responsible for the adjusting aspect Presentation Function, and three wave bands are respectively frequency and show that shelves, dutycycle show that shelves and amplitude show shelves.The continuous adjusting of frequency and dutycycle is by the realization of knob regulator potentiometer, and the adjusting of voltage magnitude is regulated autotransformer by knob and realized.The regulating frequency control handle can change the voltage signal that obtains on the potentiometer, this voltage signal is an analog quantity, pass to single-chip microcomputer after becoming digital quantity by A/D converter, through Single Chip Microcomputer (SCM) program analysis output control signal, via the turn-on and turn-off of 4 IGBT of control behind the driving circuit of phase inverter and optical coupling device formation, so just can form the waveform of needed characteristic frequency.Simultaneously, this frequency can also show with charactron.What this device acquiescence was exported is square wave, such as the square wave of other dutycycles of need, can change by rotating the Duty ratio control knob.
As shown in Figure 3, single chip control module is controlled by output and the display module of P1.1～P1.4 pin, and what this display module adopted is six charactrons.During the regulating frequency control handle, the variation of potentiometer resistance causes its terminal voltage to change, the degree of regulation of supposing potentiometer is 0.1V, gives the P1.5 pin of single-chip microcomputer after MAX187 changes into corresponding digital quantity, and this pin is latched into digital quantity in the register after obtaining signal.The crystal oscillator of single-chip microcomputer is selected 10MHz, then be 0.1 μ s its oscillation period, getting per 100 oscillation period is a unit, the 0.1V of corresponding potentiometer, like this, just the digital quantity in the register can be changed into the time, turning on and off of control P1.1～P1.4 pin reaches the purpose that can regulate continuously square wave frequency by knob.Can realize showing the purpose of square wave frequency, dutycycle and voltage magnitude by 6 charactrons.The segment encode a of charactron, b, c, d, e, f, g, dp link to each other with the P2.7～P2.0 of single-chip microcomputer respectively, the font that shows in the control charactron; The position gating of charactron control by 6 PNP triodes, receives respectively on the P0.2 of single-chip microcomputer～P0.7 port, just can control the demonstration of charactron by the output level of control P0.2～P0.7 port in the program and closes.During such as the P0.2 output low level, triode T1 conducting, + 5V power supply is added to the COM end of first charactron, first charactron D1 will demonstrate corresponding numeral so, the numeral that shows is by single-chip microcomputer P2.7～P2.0 output segment encode decision, and when P0.2 output high level, triode T1 ends, charactron DG1 does not just show, thereby realizes the gating control function of charactron position.The Graphics Processing flow process of single-chip microcomputer inside as shown in Figure 4.
It is emphasized that; embodiment described in the utility model is illustrative; rather than determinate; therefore the utility model comprises and is not limited to the embodiment described in the embodiment; every by those skilled in the art according to other embodiments that the technical solution of the utility model draws, belong to equally the scope of the utility model protection.
Claims (6)
1. one kind is used for the square wave signal generator that the resonance grounding net resonance frequency is measured, it is characterized in that: comprise single chip control module, power module and square-wave signal generation module, the input end of power module is connected with the 220V AC power, its output terminal is connected with single chip control module and square-wave signal generation module respectively and is respectively its power supply, single chip control module is connected with square-wave signal generation module, this square wave signal generating module is by four phase inverters, four photoelectric couplings, four driving circuits and four IGBT and auxiliary circuit thereof connect and compose, four phase inverters are connected for the isolated high voltage signal with four I/O interfaces of single-chip microcomputer, thereby four IGBT pipe and auxiliary circuit thereof are divided into two groups of regularly conductings and cut-off output square-wave signals under the control of single chip control module.
2. the square wave signal generator of measuring for the resonance grounding net resonance frequency according to claim 1, it is characterized in that: described single chip control module also connects a manual adjustment module for amplitude, frequency and the dutycycle of regulation output square-wave signal.
3. the square wave signal generator of measuring for the resonance grounding net resonance frequency according to claim 1, it is characterized in that: described single chip control module also connects amplitude, frequency or the dutycycle that a display module is used for showing square-wave signal.
4. according to claim 1 and 2 or the 3 described square wave signal generators of measuring for the resonance grounding net resonance frequency, it is characterized in that: described single chip control module comprises single chip computer AT 89C51 chip, peripheral circuit and A/D converter.
5. the square wave signal generator of measuring for the resonance grounding net resonance frequency according to claim 4, it is characterized in that: described power module comprises voltage-adjustable power and 5V power module, and this voltage-adjustable power is connected and composed by autotransformer, bridge rectifier circuit and RC circuit and is square-wave signal generation module for power supply; Described 5V power module is connected and composed by transformer and rectification stable pressuring unit and is that single chip control module is powered.
6. the square wave signal generator of measuring for the resonance grounding net resonance frequency according to claim 3, it is characterized in that: described display module is made of six eight segment numeral pipes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220460855.9U CN202854185U (en) | 2012-09-11 | 2012-09-11 | Square-wave signal generator for measuring resonant frequency of resonance grounding net |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201220460855.9U CN202854185U (en) | 2012-09-11 | 2012-09-11 | Square-wave signal generator for measuring resonant frequency of resonance grounding net |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019200A (en) * | 2016-08-01 | 2016-10-12 | 中南大学 | Coil sensor resonance parameter measurement method and device |
| CN107478929A (en) * | 2017-08-03 | 2017-12-15 | 国网四川省电力公司电力科学研究院 | A kind of multifunctional mobile earthing or grounding means test system |
| CN112213536A (en) * | 2020-11-10 | 2021-01-12 | 福建大唐国际新能源有限公司 | Aerogenerator converter IGBT module and drive plate tester thereof |
| CN114062741A (en) * | 2021-10-29 | 2022-02-18 | 威胜信息技术股份有限公司 | Square wave envelope type micro-topology signal generation system and method |
-
2012
- 2012-09-11 CN CN201220460855.9U patent/CN202854185U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019200A (en) * | 2016-08-01 | 2016-10-12 | 中南大学 | Coil sensor resonance parameter measurement method and device |
| CN106019200B (en) * | 2016-08-01 | 2018-07-10 | 中南大学 | A kind of measuring method and device of coil pickoff resonant parameter |
| CN107478929A (en) * | 2017-08-03 | 2017-12-15 | 国网四川省电力公司电力科学研究院 | A kind of multifunctional mobile earthing or grounding means test system |
| CN112213536A (en) * | 2020-11-10 | 2021-01-12 | 福建大唐国际新能源有限公司 | Aerogenerator converter IGBT module and drive plate tester thereof |
| CN114062741A (en) * | 2021-10-29 | 2022-02-18 | 威胜信息技术股份有限公司 | Square wave envelope type micro-topology signal generation system and method |
| CN114062741B (en) * | 2021-10-29 | 2023-02-21 | 威胜信息技术股份有限公司 | Square wave envelope type micro-topology signal generation system and method |
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Granted publication date: 20130403 |
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