CN201518472U

CN201518472U - Parallel resonance oscillating wave generating device

Info

Publication number: CN201518472U
Application number: CN2009202329094U
Authority: CN
Inventors: 薛建仁
Original assignee: 薛建仁
Current assignee: Nanjing Sute Electric Co., Ltd.
Priority date: 2009-07-24
Filing date: 2009-07-24
Publication date: 2010-06-30
Anticipated expiration: 2019-07-24

Abstract

A parallel resonance oscillating wave generating device forms a parallel loop through a frequency modulation voltage regulating power supply AC, a capacitor C and an electric inductance L. The frequency of the power supply AC is adjusted to resonate with an LC loop, the output voltage of the power supply AC is adjusted to a preset value, the power supply AC is cut off, and damping oscillating waves f (t) are generated on the LC loop. An exciting transformer T or a leakage transformer TL is arranged between the power supply AC and the LC loop, the original edge of the transformer is connected with output of the power supply AC, and the secondary edge is connected in parallel with the LC loop. When the leakage transformer is adopted, the secondary edge leakage inductance L is connected in parallel with the capacitor C. The oscillating wave generating circuit has the advantages that switching or shortening of an electronic switch is not needed, oscillating waves of 1kV to 5000kV can be generated on the LC loop, and the device has extremely wide application on measurement of sine wave voltage endurance and local discharge quantity of high voltage devices.

Description

A kind of parallel resonance oscillation wave generation device

Technical field

The utility model relates to a kind of apparatus for generating oscillating wave, especially can be used for a kind of parallel resonance oscillation wave generation device of power test.

Background technology

In the patent No. is the utility model patent of ZL200820184923.7 " a kind of be used for the apparatus for generating oscillating wave that electric equipment test is used ", the continuous current excitation apparatus for generating oscillating wave of existing German SABA company done clearly described, and the shortcoming that continuous current excitation produces the damped oscillation wave apparatus has been narrated.

Propose " a kind of be used for the apparatus for generating oscillating wave that electric equipment test is used ": adopt the frequency modulation and voltage modulation power supply to be excitation, behind LC series resonance generation resonance high voltage, with low-voltage electronic switch closes LC series resonant tank, produce damp oscillatory wave, this device produces in the process of damp oscillatory wave, the amplitude of its damp oscillatory wave is successively decreased influences the conducting state of electronic switch, influences the attenuation process of damp oscillatory wave thus again.

The utility model content

The utility model provides a kind of parallel resonance oscillation wave generation device at the problem that " a kind of be used for the apparatus for generating oscillating wave that electric equipment test is used " exists, and this device does not need electronic switch, by LC shunt circuit free damping generation damp oscillatory wave.

The purpose of this utility model is achieved in that by power supply AC, capacitor C and inductance L to be formed, and it is characterized in that: the power supply AC in this device adopts the frequency modulation and voltage modulation power supply, and forms the shunt-resonant circuit with capacitor C and inductance L.

In the utility model: described shunt-resonant circuit is made up of the equivalent capacity C of inductance L and tested electric equipment.

In the utility model: described shunt-resonant circuit is made up of the equivalent inductance L of capacitor C and tested electric equipment.

In the present invention: described frequency modulation and voltage modulation power supply AC is: the bridge inverter main circuit of being made up of IGBT, be connected with the current supply circuit of bridge inverter main circuit behind the commercial power rectification, be parallel with fly-wheel diode on each IGBT, the driver element circuit of IGBT is controlled by single-chip microprocessor MCU.

In the present invention: be provided with driver transformer T between frequency modulation and voltage modulation power supply AC and LC shunt-resonant circuit, the former limit of driver transformer is connected with frequency modulation and voltage modulation power supply AC, and the inferior limit and the LC shunt-resonant circuit of driver transformer are in parallel.

In the present invention: be provided with leakage inductance transformer TL between frequency modulation and voltage modulation power supply AC and the capacitor C, the former limit of leakage inductance transformer is connected with the frequency modulation and voltage modulation power supply, leakage inductance transformer time limit is in parallel with capacitor C, forms the shunt-resonant circuit by the inferior limit leakage inductance L and the capacitor C of leakage inductance transformer.

In the present invention: the rectification circuit of frequency modulation and voltage modulation power supply AC adopts one-way SCR to form rectifier bridge, and its rectification output is connected with the bridge inverter main circuit of frequency modulation and voltage modulation power supply through capacitor filtering.

The invention has the advantages that: turn-off the output of frequency modulation and voltage modulation power supply, its LC shunt-resonant circuit free damping produces damp oscillatory wave, does not need electronic switch in the LC loop.

Description of drawings

Fig. 1 is the schematic diagram of parallel resonance damped vibraion;

Fig. 2 is the schematic diagram that is provided with driver transformer between ac-excited power supply and the LC shunt circuit;

Fig. 3 is the schematic diagram that is provided with leakage inductance transformer between ac-excited power supply and the LC shunt circuit;

Fig. 4 is a specific embodiment of Fig. 3 application mode;

Fig. 5 is that the present invention is used for the concrete application that electric equipment is done local discharge capacity measurement;

Fig. 6 is the oscillogram of the damp oscillatory wave of Fig. 1;

Fig. 7 is the oscillogram of the damp oscillatory wave of Fig. 2;

Fig. 8 is the oscillogram of the damp oscillatory wave of Fig. 3;

Fig. 9 is the oscillogram of the damp oscillatory wave of Fig. 4;

Figure 10 is the oscillogram of the damp oscillatory wave of Fig. 5.

Embodiment

Accompanying drawing discloses the execution mode of basic principle figure of the present utility model and specific embodiment thereof without limitation, below in conjunction with embodiment the utility model is further described.

As seen from Figure 1, its basic principle is: when K is closed, ac-excited voltage is provided for inductance L and capacitor C shunt circuit by ac-excited power supply AC, when the resonance frequency of the output frequency of excitation power supply AC and inductance L and capacitor C is identical, LC shunt circuit resonance, regulate the output amplitude of excitation power supply AC, after making the resonance potential of LC shunt circuit reach predetermined value, K is opened, cut off excitation power supply, because there is internal resistance R in inductance L, the LC loop has just produced damp oscillatory wave f (t).

As seen from Figure 2, be provided with the driver transformer T that isolates usefulness between ac-excited power supply AC and LC antiresonant circuit, the output of excitation power supply AC realizes the electric insulation of ac-excited power supply AC and LC antiresonant circuit by driver transformer T.When ac-excited power supply AC and LC shunt circuit resonance, regulate the output amplitude of excitation power supply AC, make the resonance potential on the LC loop reach predetermined value, at this moment cut off ac-excited power supply AC, the LC shunt circuit just can produce a damp oscillatory wave f (t).

Fig. 3 is the another kind of form of the principle of Fig. 1 in practical application: be provided with leakage inductance transformer TL between ac-excited power supply AC and capacitor C, the difference of it and Fig. 2 only is: replace driver transformer T and inductance L with a leakage inductance transformer TL, leakage inductance L and C parallel connection by leakage inductance transformer time limit, after the resonance potential on leakage inductance L and the C shunt circuit reaches predetermined value, cut off excitation power supply AC, just can obtain a damp oscillatory wave f (t) in the shunt circuit of leakage inductance L and C.

Fig. 4 is the specific implementation circuit theory diagrams of Fig. 3.Wherein, frequency modulation and voltage modulation power supply AC comprises: the three-phase bridge rectification circuit that unidirectional controllable silicon S CR1～SCR6 forms, and silicon controlled circuits for triggering DR1 is controlled by single-chip microprocessor MCU; Output meets filter capacitor E to power supply input ACIN through silicon controlled rectifier, connects the IGBT inverter bridge after the filtering; The IGBT inverter bridge is made up of Q1～Q4, and Q1～Q4 adopts IGBT, four IGBT sustained diode 1～D4 respectively in parallel, and driver element circuit DR2 and the DR3 of IGBT are controlled by single-chip microprocessor MCU.

The output of the former edge joint IGBT inverter bridge of leakage inductance transformer TL, the inferior limit of leakage inductance transformer TL is in parallel with C, and leakage inductance transformer TL realizes the electrical isolation insulation with ac-excited power supply and LC loop on electric, and the leakage inductance L on TL limit of leakage inductance transformer is in parallel with capacitor C.

MCU is the single chip circuit unit, realizes the control to whole device thus.

In the present embodiment: the IGBT pipe Q1 and the Q2 that form inverter bridge are controlled by DR2, and Q3 and Q4 are controlled by DR3; Driver element circuit DR2 is controlled by 2 of MCU, and driver element circuit DR3 is controlled by 3 of MCU.One-way SCR is controlled by circuits for triggering DR1, and DR1 is controlled by 1 of MCU.

The course of work of present embodiment is: give silicon controlled rectifier circuits for triggering DR1 control signal by 1 of MCU, after the output process electrochemical capacitor E filtering of silicon controlled rectifier, offer the working power of IGBT inverter bridge; 2 and 3 of MCU gives IBGT drive circuit unit DR2 and DR3 control signal respectively, the output frequency and the voltage of control IGBT inverter bridge, when the resonance frequency of leakage inductance L and C is consistent with the output of IGBT inverter bridge, the output voltage of regulating the IGBT inverter bridge again reaches predetermined value, the signal of thyristor gating circuit is turn-offed in MCU output, turn-offs silicon controlled rectifier output; The IGBT drive signal is turn-offed in output simultaneously, turn-offs the output of IBGT inverter bridge; On the LC shunt circuit, just produced damp oscillatory wave.

Fig. 5 is to be example with Fig. 4 embodiment, electric equipment is made the application schematic diagram that local discharge capacity is measured, as seen from the figure, in the use, local discharge signal coupling sensor CGQ is connected in the loop of capacitor C, the local discharge signal of CGQ output is given the input port 5 of measurement of partial discharge instrument PD, the port 4 of PD is the synchronizing signal input, it is controlled by 4 ends of single-chip microprocessor MCU, it and MCU turn-off silicon controlled rectifier output and turn-off the output of IBGT inverter bridge is synchronous, this signal controlling partial discharge instrument PD is when the wave of oscillation begins, gather and the record local discharge signal, the amplitude of 3～10 wave of oscillation voltages meets the technical specification of measurement of partial discharge as long as equipment under test C goes forward, the local discharge signal of gathering and writing down, by the non real-time analysis of computer, just can calculate the size of the partial discharge quantity of this electric equipment C, so as to weighing the state of insulation of judging this electric equipment to acquired signal.

The device that can utilize the utility model to relate to carries out sinusoidal wave electric equipment withstand voltage and that partial discharge quantity is measured and comprises power cable, gas-insulated combined electric GIS, power transformer and generator etc.; The utility model device can produce the wave of oscillation of 1kV～5000kV; It will have a very wide range of applications in the sinusoidal wave withstand voltage and partial discharge quantity measurement of high voltage installation.

Claims

1. parallel resonance oscillation wave generation device: be made up of power supply AC, capacitor C and inductance L, it is characterized in that: the power supply AC in this device adopts the frequency modulation and voltage modulation power supply, and forms the shunt-resonant circuit with capacitor C and inductance L.

2. parallel resonance oscillation wave generation device according to claim 1 is characterized in that: described shunt-resonant circuit is made up of the equivalent capacity C of inductance L and tested electric equipment.

3. parallel resonance oscillation wave generation device according to claim 1 is characterized in that: described shunt-resonant circuit is made up of the equivalent inductance L of capacitor C and tested electric equipment.

4. parallel resonance oscillation wave generation device according to claim 1, it is characterized in that: the bridge inverter main circuit that described frequency modulation and voltage modulation power supply AC is made up of IGBT, be connected with the current supply circuit of bridge inverter main circuit behind the commercial power rectification, be parallel with fly-wheel diode on each IGBT, the driver element circuit of IGBT is controlled by single-chip microprocessor MCU.

5. according to the described parallel resonance oscillation wave generation device of one of claim 2～4, it is characterized in that: be provided with driver transformer T between frequency modulation and voltage modulation power supply AC and LC shunt-resonant circuit, the former limit of driver transformer is connected with frequency modulation and voltage modulation power supply AC, and the inferior limit and the LC shunt-resonant circuit of driver transformer are in parallel.

6. according to the described parallel resonance oscillation wave generation device of one of claim 2～4, it is characterized in that: be provided with leakage inductance transformer TL between frequency modulation and voltage modulation power supply AC and the capacitor C, the former limit of leakage inductance transformer is connected with the frequency modulation and voltage modulation power supply, leakage inductance transformer time limit is in parallel with capacitor C, forms the shunt-resonant circuit by the inferior limit leakage inductance L and the electric capacity of leakage inductance transformer.

7. according to the described parallel resonance oscillation wave generation device of one of claim 2～6, it is characterized in that: the rectification circuit of frequency modulation and voltage modulation power supply AC adopts one-way SCR to form rectifier bridge, and its rectification output is connected with the bridge inverter main circuit of frequency modulation and voltage modulation power supply through capacitor filtering.