CN102231603A

CN102231603A - Double-closed loop direct-current high-voltage generator

Info

Publication number: CN102231603A
Application number: CN2011101804158A
Authority: CN
Inventors: 张世铭
Original assignee: DALIAN DAGONG ANDAO SHIP TECHNOLOGY CO LTD
Current assignee: DALIAN DAGONG ANDAO SHIP TECHNOLOGY CO LTD
Priority date: 2011-06-30
Filing date: 2011-06-30
Publication date: 2011-11-02

Abstract

The invention discloses a double-closed loop direct-current high-voltage generator. A single-phase full-isolation voltage regulation rectifier module and a voltage negative feedback module form a closed loop to obtain an adjustable and stable direct-current voltage; the voltage is converted into a voltage with frequency 25 KHz through a PWM (Pulse Width Modulation) chopped wave and sent to an intermediate frequency booster transformer; and the voltage is rectified to a 50 KV direct-current high voltage via an intermediate frequency rectifier device. Values of voltage and current are taken from a high voltage side through the isolation of an optical coupler; one path of the values is sent to a PWM controller to form a closed loop; and the other path is sent to a voltage/current display unit. A main circuit IGBT (Insulated Gate Bipolar Translator) produces a voltage with smaller pulse width change to the benefit of prolonging the service life and the security of the IGBT. The double-closed loop direct-current high-voltage generator respectively carries out closed-loop voltage stabilization on input and output voltages so that the anti-interference capability of a circuit is improved.

Description

A kind of double-close-loop direct stream high pressure generator

Technical field

The present invention relates to the high voltage direct current generator field, be applicable to that particularly enterprise's power departments such as electric power, industrial and mineral, metallurgy, iron and steel carry out the DC break down voltage examination to high voltage electric equipments such as zinc oxide arrester, power cable, transformer, generators and scientific research and production unit needs the double-close-loop direct of high direct voltage to flow high pressure generator.

Background technology

Now the intermediate frequency high voltage direct current generator on the market is generally directly taked the commutation inversion half-wave voltage doubler of boosting, efficient low (halfwave rectifier), and components and parts many (multistage multiplication of voltages) are imported the influence of power-supply fluctuation and interference signal easily.Because main circuit IGBT pulsewidth can not be too narrow, cause high pressure output starting voltage higher.The high pressure starting voltage is higher, mean the test finish after, residual voltage is easy to generate potential safety hazard than higher on the test product.

Summary of the invention

In order to solve the problem that above-mentioned prior art exists, the invention provides a kind of double-close-loop direct stream high pressure generator.

Technical scheme: a kind of double-close-loop direct stream high pressure generator is provided, and the input of electrical network alternating current 220V is connected on single-phase full isolation voltage regulating rectifier module and negative feedback module ac

voltage input

1,2 respectively; The input of electrical network alternating current 220V is depressurized to through the phase synchronization step-down transformer and exchanges 18V, is connected on the single-phase full isolation voltage regulating rectifier module terminals 5,6; Single-phase full isolation voltage regulating rectifier module output dc voltage one tunnel is connected on filter capacitor C1 and the dummy load R1, and another road is connected on negative feedback module Uf+ and the Uf-; Dc voltage electrode connects anodal and dummy load R1 one end of filter capacitor C1; The direct voltage negative pole connects the filter capacitor C1 negative pole and the dummy load R1 other end; Short circuit between single-phase full isolation voltage regulating rectifier module and the negative feedback module COM terminal, short circuit between single-phase full isolation voltage regulating rectifier module and the negative feedback module CON terminal; Negative feedback module+5V and COM terminal insert 5k Ω multi-turn precision potentiometer two ends, become resistance and terminate at the Ug end; Adjust potentiometer clockwise, on the Ug terminal, produce the voltage of 0-5V, the direct current variable voltage of corresponding single-phase full isolation voltage regulating rectifier module output 0-300V; Single-phase full isolation voltage regulating rectifier module and negative feedback module and filter capacitor C1 and dummy load R1 have constituted closed negative feedback loop.

Single-phase full isolation voltage regulating rectifier module output dc voltage is connected on main circuit IGBT-H bridge input through filter capacitor C1 positive pole and dummy load R1.

Through current-limiting resistance R2 output, earth terminal is exported ground connection through over-current sensor to high direct voltage through high-voltage filtering capacitor filtering high-pressure side; Be connected resistance R 3 at resistance R 2 outputs with the ground connection output; R4; resistance R 4 two ends are connected with optical coupling isolation circuit, and optical coupling isolation circuit is connected with voltmeter ammeter and PWM controller, form voltage stabilizing and high-tension current current foldback circuit that negative feedback closed loop is carried out high direct voltage.

Technique effect: the present invention takes through single-phase full isolation voltage regulating rectifier module, the voltage negative feedback module forms closed loop, obtaining an adjustable piezoelectricity presses galvanic current to press (input voltage closed loop), copped wave becomes 25 KHz to this voltage through PWM, deliver to the intermediate frequency step-up transformer, rectification produces 50 kilovolts of high direct voltages through the intermediate frequency rectifying device.Survey through light-coupled isolation power taking piezoelectricity flow valuve from high pressure, the one road delivers to the PWM controller forms closed loop, obtains stable high direct voltage (output voltage closed loop); The electric current and voltage display unit is delivered on another road.General intermediate frequency high voltage direct current generator, for obtaining the range of regulation of broad, the PWM controller is operated between the duty ratio 10%～48%; Double-close-loop direct stream high pressure generator carries out pressure regulation (voltage coarse adjustment) with single-phase full isolation voltage regulating rectifier module earlier, carries out pressure regulation with PWM controller PWM IGBT circuit again.The PWM controller can be operated in (voltage fine tuning) between the duty ratio 30%-40%.Main circuit IGBT produces the voltage that pulse width variations is less relatively, helps improving IGBT useful life, improves IGBT fail safe (the easily unusual conducting of the too wide upper and lower bridge arm of pulsewidth punctures, and the too narrow module of pulsewidth is overheated burns easily).High voltage direct current generator is mainly used in power plant, transformer station, and equipment is in the environment of highfield, high-intensity magnetic field, causes easily electronic jamming to make circuit erroneous action, has influence on fail safe, the reliability of high voltage direct current generator.Double-close-loop direct stream high pressure generator carries out the closed loop voltage stabilizing to input, output voltage respectively, has improved the circuit antijamming capability.

Description of drawings

Fig. 1 double-close-loop direct stream of the present invention high-voltage generator circuit figure.

Embodiment

The present invention is described in detail below in conjunction with drawings and Examples.

With reference to Fig. 1, in the present embodiment, the input of electrical network alternating current 220V is connected on single-phase full isolation voltage regulating rectifier module and

negative feedback module

1,2 ac voltage input respectively.The input of electrical network alternating current 220V is depressurized to through the phase synchronization step-down transformer and exchanges 18V, is connected on single-phase full isolation voltage regulating rectifier module 5,6 terminals, provides a synchronous triggering voltage to module.Single-phase full isolation voltage regulating rectifier module output dc voltage one tunnel is connected on filter capacitor C1 and the dummy load R1, and another road is connected on negative feedback module Uf+ and Uf-and goes up that (dc voltage electrode connects anodal and dummy load R1 one end of filter capacitor C1, and negative feedback module Uf+ holds; The direct voltage negative pole connects the filter capacitor C1 negative pole and the dummy load R1 other end, negative feedback module Uf-end).Short circuit between single-phase full isolation voltage regulating rectifier module and the negative feedback module COM terminal, short circuit between single-phase full isolation voltage regulating rectifier module and the negative feedback module CON terminal.Negative feedback module+5V and COM terminal insert 5k Ω multi-turn precision potentiometer two ends, become resistance and terminate at the Ug end.Adjust potentiometer clockwise, on the Ug terminal, produce the voltage of 0-5V, the direct current variable voltage of corresponding single-phase full isolation voltage regulating rectifier module output 0-300V.Filter capacitor C1 and dummy load R1 make DC voltage waveform level and smooth, and amplitude stability helps the work of negative feedback module stability.Single-phase full isolation voltage regulating rectifier module and negative feedback module and filter capacitor C1 and dummy load R1 have constituted closed negative feedback loop, and the output dc voltage fluctuation that power network fluctuation and the interference that causes because of external environment condition from ac input end cause under this negative feedback loop is again lowered significantly.

Single-phase full isolation voltage regulating rectifier module output dc voltage is connected on main circuit IGBT-H bridge input through filter capacitor C1 positive pole and dummy load R1, IGBT-H bridge output produces the voltage of pulsewidth 30%-40% frequency 25kHz, amplitude 0-300V under the control of PWM controller, this voltage rises to 40kV through intermediate frequency transformer, becomes direct current through the high pressure bridge rectifier.General high voltage direct current generator intermediate frequency transformer output voltage low (about 20kV) is again through the rectification of boosting of high pressure voltage-multiplying circuit, circuit complexity, efficient low (halfwave rectifier).This high voltage direct current generator intermediate frequency transformer has been abandoned FERRITE CORE commonly used, with novel Fe-based amorphous iron core, special insulating material and mode directly rise to required voltage with voltage, reduce the subsequent conditioning circuit component number, improved efficient (full-wave rectification).

Through current-limiting resistance R2 output high pressure, earth terminal is exported ground connection through over-current sensor to high direct voltage through high-voltage filtering capacitor filtering high-pressure side.Be connected R3, R4 at the R2 output with the ground connection output, R4 both end voltage value is the high tension voltage sampling value, and R4 both end voltage value is delivered to optical coupling isolation circuit.Magnitude of voltage that current sensor is surveyed is that high-tension current sampling value, high-tension current sampling value are delivered to optical coupling isolation circuit.Optical coupling isolation circuit generates two paths of signals with two signals, and one the road delivers to the voltmeter ammeter carries out high tension voltage and high-tension current demonstration.Another road is delivered to PWM controller formation negative feedback closed loop and is carried out the voltage stabilizing and the high-tension current overcurrent protection of high direct voltage.If high-voltage load self changes and causes high pressure fluctuations like this, negative-feedback closed-loop circuit can adjust accordingly the fluctuation that suppresses high direct voltage, reaches voltage regulation result.

Above content be in conjunction with optimal technical scheme to further describing that the present invention did, can not assert that the concrete enforcement of invention only limits to these explanations.Concerning the general technical staff of the technical field of the invention, under the prerequisite that does not break away from design of the present invention, can also make simple deduction and replacement, all should be considered as protection scope of the present invention.

Claims

1. a double-close-loop direct stream high pressure generator is characterized in that the input of electrical network alternating current 220V is connected on single-phase full isolation voltage regulating rectifier module and negative feedback module ac voltage input (1,2) respectively; The input of electrical network alternating current 220V is depressurized to through the phase synchronization step-down transformer and exchanges 18V, is connected on the single-phase full isolation voltage regulating rectifier module terminals (5,6); Single-phase full isolation voltage regulating rectifier module output dc voltage one tunnel is connected in filter capacitor (C1) and the dummy load (R1), and another road is connected on negative feedback module Uf+ and the Uf-; Dc voltage electrode connects anodal and dummy load (R1) end of filter capacitor (C1); The direct voltage negative pole connects filter capacitor (C1) negative pole and dummy load (R1) other end; Short circuit between single-phase full isolation voltage regulating rectifier module and the negative feedback module COM terminal, short circuit between single-phase full isolation voltage regulating rectifier module and the negative feedback module CON terminal; Negative feedback module+5V and COM terminal insert 5k Ω multi-turn precision potentiometer two ends, become resistance and terminate at the Ug end; Adjust potentiometer clockwise, on the Ug terminal, produce the voltage of 0-5V, the direct current variable voltage of corresponding single-phase full isolation voltage regulating rectifier module output 0-300V; Single-phase full isolation voltage regulating rectifier module and negative feedback module and filter capacitor (C1) and dummy load (R1) have constituted closed negative feedback loop;

Single-phase full isolation voltage regulating rectifier module output dc voltage is connected on main circuit IGBT-H bridge input through filter capacitor (C1) positive pole and dummy load (R1);

Through current-limiting resistance (R2) output, earth terminal is exported ground connection through over-current sensor to high direct voltage through high-voltage filtering capacitor filtering high-pressure side; Be connected resistance (R3 at resistance (R2) output with the ground connection output; R4); resistance (R4) two ends are connected with optical coupling isolation circuit, and optical coupling isolation circuit is connected with voltmeter ammeter and PWM controller, form voltage stabilizing and high-tension current current foldback circuit that negative feedback closed loop is carried out high direct voltage.