High voltage power supply for electron gun

Product introduction:

The high power and high voltage switching power supply of our company adopts the high frequency inverter zero voltage whole bridge section switching circuit topology above 20kHz and the high performance DSP digital control technology as the core to form the control system. The touch screen intelligent operation panel is used as the man-machine interface to communicate with the upper computer to achieve intelligent control. With small volume, high efficiency, light weight, reliable quality, stable performance, voltage response speed and other advantages, widely praised by users!

Application field:

High voltage inverter testing, high voltage capacitor charging, high energy electron injection, electron accelerator power supply, electron beam melting, electron beam welding machine power supply, electron gun power supply, electrostatic dust removal, plasma, radar transmitter power supply, gas high voltage glow discharge, electron tube (klystron) power supply; Enterprises, colleges and universities, national defense scientific research, materials synthesis and other fields requiring high-voltage and high-power power supply.

Performance characteristics:

1, small size, light weight, high efficiency, reliable quality, stable performance.

2, input/output isolation, power operation.

3, with constant pressure, constant current, output mode; Output voltage and output current can be adjusted in a full range.

4, with input multistage filter circuit, reduce harmonic interference to the power grid.

5, double closed loop control circuit, fast response speed, stable output.

6, the use of multiple short-circuit protection circuit, high voltage power supply in the output frequency short-circuit state reliability.

7, the full bridge phase shifting soft switching technology, the efficiency of the whole machine is higher than 90%

8, with RS48S/RS232 evaluation interface, using MODBUS-RTU communication protocol.

9, with external analog interface, can realize the external detection of power supply status, control power output.

10. Redundancy technology; AIYS high power and high voltage power supply system can disconnect any one or a group of single machines at any time without affecting the stable operation of the whole power system under the condition of redundant machines and equipment. The use of this technology improves the stability of some systems that cannot be disconnected

11, protection mode: over voltage protection, over current protection, over temperature protection, lack of phase protection, short circuit protection, overload protection, input undervoltage and overvoltage protection

High power and high voltage power supply for electron gun

Unique technology:

1, multiple ignition short circuit protection machine reliability

(l) The power supply has a current upsurge suppression circuit, which can effectively inhibit the upsurge of several thousand amps of current generated by the high voltage output short circuit.

(2) The short circuit of the high voltage output will generate instantaneous high voltage interference through the ground wire and feedback to the power grid. The unique discharge of the power supply protects other equipment and the power supply itself from damage or interference.

(3) Short circuit of the power supply will cause sudden change of the current in the circuit. When the sensitive current detection circuit detects that the current exceeds the protection set value, the current limiting power control circuit will be started within 10 microseconds, and the output current will be controlled within the set value.

(4) Power short circuit will cause high voltage voltage drop, voltage drop and flash detection circuit time to detect the load of lighting short circuit, timely start protection circuit.

2. High pressure and low pressure separation design

In order to protect the user's life to a greater extent, the power supply will be designed in two cases, the low-voltage part of the control stage and the high-voltage part of the output stage. The user adjusts the power supply part to the low-voltage cabinet (the higher voltage is not more than 400V), the high-voltage part is completely sealed in the high-voltage case, and the machine shell is grounded. Thus, the high pressure is separated from the operator completely.

3. Reliability guarantee of core devices

The core component of power supply adopts high-quality rectifier module. The module has been widely used in various industries in the market, with high running stability, good universality and reliability.

Electron gun power supply system is composed of a number of systematic switching power modules in series, with the accuracy/high degree/high stability and other excellent electronic characteristics, professional used in vacuum electron gun equipment, electron gun high voltage power supply system is divided into cooling gun and hot gun power system two categories/cold cathode gas discharge gun power supply is mainly a group of 30KV high voltage output, The thermal gun power supply system has three sets of power supply voltage output, which are 30KV main high voltage power supply, 1500V-3000V acceleration power supply (also known as sub-high voltage power supply), 1500V specifications in general metropolis, 12-25V filament power supply, filament power supply and acceleration power supply are suspended above the 30KV main high voltage power supply. Because of the bad working environment of electron gun, these power sources must be able to allow long time discharge, spark and short circuit; Therefore, the electron gun power supply must have the protection line, with superior short-circuit resistance performance, can be applied to all kinds of working conditions, the power supply for the high frequency shift to the full bridge soft switching power supply, it has high precision, high efficiency, small wave, small size characteristics, can be applied to a variety of work occasions, the redundancy technology of the electron gun power supply can make the use of special occasions to improve the stability of the power supply, The high voltage power supply equipment of electron gun designed and produced by our company, whether cold gun power supply or hot gun power supply, has been verified by long-term practice, and has high reliability and stability.

Functional features:

● Specification range: Output voltage 100V-50KV, output power 1KW-1000KW within the option, special specifications can be customized, short time cycle. Multiple single specifications 3KW 5kw 10kw 15kw 35kw(air cooled) 50kw(air cooled + water cooled)200kw 300kw 400kw 500kw(water cooled) A variety of combination specifications 100kw 200kw 300kw 400kw 500kw 600kw 700kw  800kw 900kw 1000kw

● Short circuit protection: because the electron gun long-term work in the environment of lighting short circuit, so the anti-lighting short circuit protection function of the electron gun high voltage power supply requirements are particularly high, must allow the load for a long time discharge lighting and short circuit, but also short circuit protection. The high voltage power supply equipment of electron gun is equipped with 5 anti-flaring short circuit protection functions

● For the 30KV main high voltage short-circuit will instantly produce thousands of amperes short-circuit current, plus a special suppression circuit.

● For the 30KV main high voltage light will be found through the ground wire when the high voltage hit the power grid, add a special discharge protection circuit, in order to other equipment and power itself is not broken. Ultra-short protection time: sensitive current detection circuit detection side when the current exceeds the protection set value, immediately start the current limiting power control circuit, and discover the current control within the set value. The protection start time is within 10 microseconds and can be achieved within 3 microseconds.

● Double current protection: reprotection, dynamic current detection control circuit to make the current dynamically stable at the set value.

The second protection output current width value protection control circuit detection side to discover the current exceeds the set width value, immediately stop the current energy output cycle, circuit reset re-enter the next energy output cycle, control circuit after each reset new energy output cycle are soft start, that is, energy output from zero to a rising process. This control mode allows a smooth process for each energy output.

● Power supply voltage drop and flicker detection circuit time detection side load lighting short circuit, timely start protection circuit.

● Redundancy technology: AYS the high power supply system can cut off any one or a group of single machines at any time without affecting the stable operation of the whole power system under the condition of redundant machines and equipment. The application of this technology improves the stability of some systems that cannot be powered off, which is not suitable for ordinary power supplies that do not realize the redundancy function of power supplies.

● Module design: The power system adopts modular design, 35KW is a standard module, the front inverter and the rear rectifier are independent of each other, simple installation, easy maintenance

● Oil tank application: let the high pressure component in the transformer oil, the use of transformer oil high insulation performance, not only reduce the high pressure component in the air will be caused by water vapor and dust spark discharge, but also increase the usability; The environmental conditions of the power supply equipment have been relaxed, the protection level of the power supply equipment can be higher, the power components of the high voltage part of the power supply better heat dissipation, and the volume of the power supply equipment is smaller.

● Overvoltage protection: when the output voltage exceeds the upper limit voltage set by the power supply system, the power supply system will automatically cut off the output and send an alarm.

● Current protection: current protection value 0-100% rating continuously adjustable, current exceeds the protection value when the start protection (can be preset according to customer requirements software overcurrent value)

● Overload protection: the power supply is equipped with an overload protection circuit to prevent the power supply from being damaged due to overload protection: the power supply is equipped with an overheat protection circuit, when the temperature of the power radiator exceeds 75 degrees to protect the shutdown, lower than 75 degrees automatically resume work

● Network protection: power supply protection stops when the input voltage exceeds the range of AC 342V to 420V

● Stable voltage and current: voltage and current values can be adjusted continuously from approximately zero to rated value, automatic conversion of stable voltage and current.

● Intelligent control: Optional to achieve local control and remote control, RS232 / RS485 serial communication standard configuration can be connected with the computer, composed of intelligent remote control power supply.

● Analog control: isolated analog control, users can use 0 to 5V or 4 to 20mA signal control power output voltage and current (optional).

● Linkage adjustment: the new linkage adjustment technology, with a network cable connected to each module, synchronously adjust each module, to achieve the average output of each module.

● Precision control: the selection of precision 10 ring potentiometer to control the output voltage and current (according to customer requirements with software to control the power equipment).

● Ultra-small volume: 1OOKW volume only 650 * l200 * 2000 mm, effectively reduce the working space.

● Ultra-light weight: The total weight of 10OKW power equipment is less than 400KG.

● Frequency: High frequency reduces the ripple of the power supply and improves the power density of the power supply.

● Efficiency: The efficiency of the whole machine can reach 94%.

● Heat dissipation: A single machine is equipped with a fan whose speed is controlled by temperature.

● Output display: voltage, current at the same time LED digital screen display (according to customer requirements with LCD display).

● Short circuit alarm: when the output short circuit, the power supply sound and light alarm (optional).

● Surge limit: AC input uses active surge current limit to reduce the impact on the power grid when the input is powered on

Unique technology:

● High voltage power supply adopts multi-module mutual sampling technology, so that each module output balance.

● The filament power supply and auxiliary high voltage power supply in the electron gun power supply equipment adopt the high voltage isolation direct sampling technology developed by the Eisensen team or the optical fiber isolation high voltage sampling method.

● The temperature controller is used to control the speed of the cooling fan and automatically control the cooling temperature of the single power supply.

Special technology

● High voltage power supply adopts small high pressure tank mode, simple structure, easy installation and maintenance. High voltage components immersed in oil heat dissipation, effectively reduce the temperature of high voltage power components, greatly prolong the service life of insulation materials; Reduced high voltage components exposed to air on the housing possible discharge.

● The high voltage transformer in the oil tank adopts double high voltage insulation mode

● High voltage wire insulation: the use of tens of thousands of volts of high voltage insulated wire insulation protection

● Transformer oil insulation: in the high voltage transformer primary stage interval is full of transformer oil, improve the insulation between the primary stage voltage resistance.

The heat pipe of the radiator makes the heat of the whole radiator more uniform, the local temperature of the power device is lower, and the service life of the power device is longer.

Methods of use with redundant machinery equipment

For a machine with redundant power supply devices, power on only the main power supply device first. Record the output voltage and current of the main power supply device after it is installed and debugs. Power off the main power supply and power on the backup power supply. Perform debugging based on the output voltage and current of the main power supply. After debugging, power on the main power supply and redundant devices at the same time. After normal operation, the redundant machine equipment and the main power supply are also turned on together, in case of the shutdown of the common machine equipment due to unexpected circumstances, the backup machine equipment to continuously supply power to the load. This configuration improves the reliability of power supply equipment for some places where power cannot be cut off.

Method of use of electron gun power supply

1. Use of heat gun power supply (Take 100KW electron gun as an example, turn on the power supply after the vacuum degree in the furnace reaches the requirement).

● First turn on the filament power supply, the current in about 15A preheating.

● Increase the filament current to about 20A for intermediate preheating.

● Increase the filament current to about 25A and turn on the main high-voltage power supply of 3OW

● The negative high-voltage power supply gradually increases from zero, observe the beam spot of the electron beam through the observation window, adjust the beam point focus and pattern deflection to achieve the desired target pattern.

● Increase the output voltage of the auxiliary high voltage power supply (the speed of the auxiliary high voltage power supply regulation must be slow, the output voltage of the auxiliary high voltage power supply determines the output power of the electron gun), to adjust the output power of the electron gun.

● The basic principle of the power of the electron gun: whether using powder raw materials or refining sintered raw materials, the basic principle of the power of the electron gun is to start from a small power, with the reduction of the number and range of the electron gun vacuum furnace body and gradually increase the power. The head of the hot gun is generally required to be equipped with a molecular pump, which is used to improve the vacuum degree of the electron gun to reduce the number and range of high pressure ignition in the vacuum furnace of the electron gun.

2. Use of cold gun power supply (Take high-power metal melting electron gun as an example, turn on the power supply after the vacuum degree in the furnace reaches the requirement)

● Set output voltage of power supply 30KV

● Set the output current as 1A(the actual situation takes the electron gun power as the reference to set the initial current, 100KW electron gun about 1A, and so on); It is also possible to adjust the output power by adjusting the air filling to a larger current threshold (gas varies according to different smelters, refer to the smelting process).

● The control power supply starts to output. At the beginning, the electron gun frequently sparks, and the output current fluctuations are normal. If the current is low or basically no current, gas can be filled into the furnace body according to the volume ratio of the furnace body (gas varies according to the different smelter, refer to the melting process).

● When the lighting frequency is reduced, the output current can be increased until the full power or the required power.

Use environment and maintenance of electron gun power equipment

● The high-voltage power supply of electron gun is generally a high-power power supply. The air-cooled power supply generally requires the room environment to be well ventilated or equipped with air exchange equipment due to the need of heat dissipation, and the ambient temperature is controlled between 10 and 40 degrees below zero. The water-cooled power supply does not require the ventilation of the room environment, and the ambient temperature can be controlled between 5 degrees and 50 degrees.

● The dust requirement level of the electron gun high voltage power supply is determined by whether the high voltage component of the power supply equipment is exposed in the air. The high voltage component of the mega electron high voltage power supply is placed inside the oil tank, and the air is not directly in contact with the dust protection requirement is not too high.

● All power equipment is designed in accordance with a more reasonable grid environment to design the circuit, in order to achieve the more optimized principle, the general requirements of the AC grid voltage between 342 and 420.

● Humidity has a significant impact on the discharge of high voltage components to other components or chassis through air or dust