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Special power supply
Special power can be subdivided into: shore power, security power, high voltage power supply, medical power, military power, aerospace power, laser power, and other special power.
Special power supply is a special kind of power supply. The so-called special is mainly due to the technical requirements of the power supply is different from the commonly used power supply, which is particularly high output voltage, the output current is particularly large, or stability, dynamic response and ripple requirements are particularly high, or require power output voltage Or current is a pulse or some other requirement. This makes the design and production of such power supply than the ordinary power supply has a more special or even more stringent requirements. Special power supply is generally designed for special loads or occasions, and its application is very extensive. Mainly: electroplating electrolysis, anodizing, induction heating, medical equipment, power operation, power test, environmental protection dust, air purification, food sterilization, laser infrared, photoelectric display. In the national defense and military, special power supply is more common power irreplaceable use, mainly for: radar navigation, high-energy physics, plasma physics and nuclear technology research.
The same time as
1, radar transmitter with high voltage power supply
In modern radar transmitters, the use of TWT as a microwave power amplifier device occupies a large proportion, as a high power part, its reliability and technical indicators, the radar transmitter and the whole radar has a direct impact The While the high-voltage power supply (system) that supports the traveling wave tube is even more important. Switching power supply technology as a high-frequency, high-efficiency power electronics technology, with the electronic components, product updates, high-power devices replacement, high-power switching power supply technology has been developed. Radar traveling wave tube with high-voltage switching power supply, can be full-bridge resonant PWM modulation, high-power switching devices using advanced IGBT modules and advanced and reliable drive circuit, making the overall power performance is good, good stability, and has a variety of protection The
How it works: 50Hz three-phase 380V through the grid filter, rectifier and filter to get more than 500 volts DC voltage, supply series resonant converter. As the power output up to 20kV, in order to reduce the difficulty of the design of the transformer and reduce the high voltage rectifier diode voltage, improve power supply reliability, the use of two secondary transformer transformer full bridge rectifier, and then superimposed output. Full-bridge converter consists of four IGBTs, a high-frequency transformer and rectifier circuit. The control circuit provides two pairs of pulses that are insulated from each other by a phase difference of 180 ° to the IGBT drive circuit to control the turn-on of the IGBT. The DC voltage into an alternating 20kHz pulse voltage, the transformer and full bridge rectifier and filter circuit, get tens of kV voltage.


2, electron beam welding machine with high power and high voltage power supply
Electron beam welding is widely used in many industries such as aerospace, atomic energy, national defense and military, automobile and electrical and electrical instrumentation because of its advantages such as no welding rod, easy oxidation, good process reproducibility and small thermal deformation. The basic principle of electron beam welding is that the cathode in the electron gun emits electrons by direct or indirect heating, which can form an electron beam with high energy density by accelerating the electromagnetic field with the acceleration of the high voltage electrostatic field. Workpiece, a huge kinetic energy into heat, so that welding parts melting, the formation of molten pool, in order to achieve the welding of the workpiece.
High-voltage power supply is one of the key technologies of the equipment. It mainly provides the accelerating voltage for the electron gun, and its performance is directly related to the electron beam welding process and the welding quality. The high voltage power supply of the electron beam welding machine has different technical characteristics compared with other types of high voltage power supply. The technical requirements are mainly ripple coefficient and stability, the ripple coefficient is less than 1%, the stability is ± 1% Wave coefficient less than 0.5%, stability ± 0.5%, while repeatability requirements of less than 0.5%. The above requirements are determined by the electron beam spot and the welding process. Electron beam welding machine with high-voltage power supply operation must be related to the system chain protection, mainly vacuum chain, cathode chain, gate valve chain, focus chain, etc., to ensure equipment and personal safety. High-voltage power supply must comply with EMC standards, with soft-start function, to prevent the sudden closing of the impact of power.
This power supply is high (up to 30kW), the output voltage is high (150kV), the operating frequency is higher (20kHz), and the stability accuracy, ripple and voltage regulation rate have higher requirements. Selection of advanced three-phase full control of the controllable rectifier technology, high-power high-frequency inverter, with a new power device IGBT as a power switch. Three-phase full control of the rectifier and inverter using a separate control board, IGBT drive using imported thick film drive circuit, coupled with the input grid filter and smoothing reactor and capacitor composition of the filter circuit. So that the power of the power conversion part of a good technical advanced and good power conversion.
High-voltage parts: high-voltage transformer core using the latest amorphous material, using a unique high-frequency high-voltage winding process, double high-voltage transformer stack work. Advanced rectifier and reasonable voltage doubler circuit and high pressure pressure equalization technology to ensure high-voltage power supply part of the high-voltage part of the stable and reliable, feedback and high-pressure signal with a precision voltage divider, direct sampling from the high-voltage output to ensure that the power supply has a high voltage Accuracy, voltage regulation and accurate and reliable high voltage measurement accuracy. Using a reasonable high-pressure filter technology to ensure that the power supply has a good ripple. The high pressure part is placed in a tank.


3, high voltage pulse power
In radar navigation equipment, the launch part of the general need for a high voltage, narrow pulse, different repetition rate of strong power pulse source. This high-power pulsed source is typically boosted by a high-voltage power supply to several thousand volts to several tens of kilovolts of DC high voltage, and then a modulator will be modulated by a modulator to the required pulse width and frequency of the pulse source for the launch tube use.
The pulse source is mainly composed of high voltage power supply and modulator part. The high voltage power supply adopts the switching power supply, and the modulator adopts the solid state modulator of the semiconductor device.
The trigger pulse given by the user is the TTL level signal. The interface circuit should be added before the input isolation transformer. The interface circuit is to pre-amplify the TTL pulse signal and the other is to match the isolation transformer. In order to achieve the purpose of isolation, the use of this interface circuit can provide power, manufacturers only need to put forward the power requirements and in the circuit design of the corresponding transformation, filter circuit can be.
Trigger pulse after the pulse transformer isolation through the pre-regulator pulse shaping, power amplification to trigger the modulation board and truncated plate work. The excitation pulse generated by the preconditioner is isolated by the transformer to drive each field effect transistor of the modulation board. At this time, the modulation board turns on the high voltage power supply to the anode of the microwave transistor, the cathode of the microwave transistor starts to emit, and the microwave transistor Into the input of the low-power high-frequency signal amplification into high-power high-frequency signal. When the pulse is over, the truncated pulse generated by the preconditioner triggers the truncated plate, and the truncated plate turns on to release the distributed capacitance of the microwave transistor, so that a good pulse trailing edge can be obtained.