CN204131426U

CN204131426U - With the high-voltage pulse generator of phase-detection

Info

Publication number: CN204131426U
Application number: CN201320784073.5U
Authority: CN
Inventors: 朱文滔; 罗向源
Original assignee: Foshan Power Supply Bureau of Guangdong Power Grid Corp
Current assignee: Foshan Power Supply Bureau of Guangdong Power Grid Corp
Priority date: 2013-12-04
Filing date: 2013-12-04
Publication date: 2015-01-28
Anticipated expiration: 2023-12-04

Abstract

The utility model relates to a kind of high-voltage pulse generator with phase-detection, comprise rectification circuit successively, BUCK-BOOST circuit, inverter circuit, step-up transformer, full-wave rectifying circuit, also comprise phase detecting circuit, phase detecting circuit comprises two voltage comparators and single-chip microcomputer, the waveform that standard AC waveform and high-voltage alternating export inputs two voltage comparators respectively, export the square-wave signal of band phase information, the waveform phase that square-wave signal input single-chip microcomputer carries out calculating outputting standard AC wave shape and high-voltage ac power is poor, and the phase place occurred according to the requirement paired pulses of Puled input and frequency calculate it, export corresponding control signal to inverter circuit adjustment phase place, reach the high-voltage pulse signal exporting and meet the demands.System can make high-voltage pulse generator form good impulse waveform, and can realize arbitrary phase point high-voltage pulse being superimposed on alternating voltage, ensures the precision controlling of generator.

Description

With the high-voltage pulse generator of phase-detection

Technical field

The utility model relates to a kind of testing circuit, particularly a kind of high-voltage pulse generator with phase-detection.

Background technology

In recent years, aging with in the field of breakdown characteristics at research dielectric, the application of nanosecond high-voltage pulse becomes increasingly conspicuous.Through the development of three more than ten years, hide polytechnical university high fields by the 80's Japan and reach male professor's proposition pulse electroacoustic method (PEA) due to its excellent test performance, become the measuring technique to the distribution of solid dielectric insulation Space-charge popular at present.The operation principle of this test macro is: by applying narrow electric pulse to test product, form impulse electric field in the sample, distributed charge in sample produces disturbance Fa (t) under the effect of impulse electric field, this disturbance forms corresponding acoustic signals P (t), utilizes the measurement of piezoelectric transducer to sound wave to obtain corresponding distribution of space charge.By the measurement to the distribution of space charge in material, the internal electric field distortion in material can be recognized, and on the high field conduction characteristic of material and the impact of breakdown characteristics.As can be seen from PEA space charge measurement principle, this system needs the duration of an impulse electric field to be far smaller than the sound wave transmission time in the sample.Current PEA high-voltage pulse power source exists that voltage is low, pulse duration is single, can not be used in the defects such as AC field, cannot meet the space charge measurement in power cable insulation.

High-voltage pulse generator all can realize pulse duration and pulse amplitude is selected and regulates, whole system is also with phase-detection function, realize the phase-detection to alternating voltage, and control impuls produces in different phase places, thus the high-voltage pulse that tune high-voltage pulse generator is produced meets the demand of measurement.

Summary of the invention

The utility model is the problem for adjustable high-voltage pulse generator more and more high request, proposes a kind of high-voltage pulse generator with phase-detection, realizes phase-detection, helps through high-voltage pulse and superposing of input arbitrarily, the precision controlling of guarantee generator.

The technical solution of the utility model is: a kind of high-voltage pulse generator with phase-detection, comprise rectification circuit, BUCK-BOOST circuit, inverter circuit, step-up transformer, full-wave rectifying circuit, programme control circut, the alternating voltage of input carries out rectification through rectification circuit, by inputting inverter circuit after the boosting of BUCK-BOOST circuit, inverter circuit exports action of low-voltage pulse and exports through step-up transformer boosting, finally enter full-wave rectifying circuit and be rectified into high-voltage positive pulses, also comprise phase detecting circuit, phase detecting circuit comprises two voltage comparators and electric sheet machine, the waveform that standard AC waveform and high-voltage alternating export inputs two voltage comparators respectively, export the square-wave signal of band phase information, the waveform phase that square-wave signal input single-chip microcomputer carries out calculating outputting standard AC wave shape and high-voltage ac power is poor, phase detecting circuit exports and send programme control circut, programme control circut exports corresponding control signal to inverter circuit adjustment phase place.

The beneficial effects of the utility model are: the phase detecting circuit in the utility model high-voltage pulsed source, high-voltage pulse generator can be made to form good impulse waveform, and arbitrary phase point high-voltage pulse being superimposed on alternating voltage can be realized, ensure the precision controlling of generator.

Accompanying drawing explanation

Fig. 1 is the high-voltage pulse generator theory diagram of the utility model band phase-detection;

Fig. 2 is the utility model phase detecting circuit figure;

Fig. 3 is the utility model phase-detection Time-Series analysis figure;

The oscillogram of Fig. 4 is the utility model phase place when being 60 ° Phase Stacking;

The oscillogram of Fig. 5 is the utility model phase place when being 30 ° Phase Stacking.

Embodiment

High-voltage pulse generator theory diagram as shown in Figure 1 with phase-detection.High-voltage pulse generator with phase-detection comprises rectification circuit, BUCK-BOOST circuit, inverter circuit, step-up transformer, full-wave rectifying circuit, programme control circut and phase detecting circuit.First the alternating voltage of input is carried out rectification through rectification circuit, then boosted by BUCK-BOOST circuit, and by controlling output sampling circuit (sample circuit is here the control end of whole high-voltage pulsed source), output voltage is controlled, then inverter circuit is entered, phase detecting circuit is utilized to pass through the phase-detection of the output waveform to high-voltage ac power, and the phase place occurred according to the requirement paired pulses of Puled input and frequency calculate it, export corresponding control signal to inverter circuit, inverter circuit output action of low-voltage pulse is input to step-up transformer and boosts, finally utilize rectification circuit that impulse commutation is become high-voltage positive pulses.

In order to enable this high-voltage pulsed source be used in space charge measurement under ac high-voltage, this controls the formation time of high-voltage pulse with regard to needing, and enables high-voltage pulse be superimposed on the out of phase of ac high-voltage.Whole control circuit contains phase-control circuit, drive circuit etc., under regard to phase detecting circuit analysis.Phase detecting circuit of the present utility model adopts two voltage comparators to realize, as shown in Figure 2 its phase detecting circuit figure and Time-Series analysis figure, U _i1for standard AC waveform, U _i2for tested waveform, i.e. the waveform of high-voltage alternating output, exports the square wave U of band phase information respectively through voltage comparator ₀₁and U ₀₂, be input in single-chip microcomputer, start in rising edge mode, be i.e. the waveform in high-voltage alternating source, calculate the time difference between tested waveform and reference waveform startup timing, this time is multiplied with angular frequency, is the phase difference between two signals.In Time-Series analysis figure, ΔΦ is the phase difference between measured signal and standard signal.

Input phase is processed, calculates the time sending pulse, control the conducting of high-voltage pulsed source high-voltage switch gear, thus high-voltage pulse is superimposed upon in the corresponding phase place of ac high-voltage, realize superposing the high-voltage pulse at ac high-voltage out of phase place.

A n is have developed based on above-mentioned discussion and simulation analysis] s level high-voltage pulse generator, the MSO3024 type digital oscilloscope of dedicated bandwidth 200MHz and RC divider (voltage ratio 1:10000) are measured the waveform of superimposed pulse, when phase place is 60 ° and 30 ° time Phase Stacking waveform as shown in Figure 4,5.

Claims

1. the high-voltage pulse generator with phase-detection, comprise rectification circuit, BUCK-BOOST circuit, inverter circuit, step-up transformer, full-wave rectifying circuit, programme control circut, the alternating voltage of input carries out rectification through rectification circuit, by inputting inverter circuit after the boosting of BUCK-BOOST circuit, inverter circuit exports action of low-voltage pulse and exports through step-up transformer boosting, finally enter full-wave rectifying circuit and be rectified into high-voltage positive pulses, it is characterized in that, also comprise phase detecting circuit, phase detecting circuit comprises two voltage comparators and single-chip microcomputer, the waveform that standard AC waveform and high-voltage alternating export inputs two voltage comparators respectively, export the square-wave signal of band phase information, the waveform phase that square-wave signal input single-chip microcomputer carries out calculating outputting standard AC wave shape and high-voltage ac power is poor, phase detecting circuit exports and send programme control circut, programme control circut exports corresponding control signal to inverter circuit adjustment phase place.