A special power supply is a special type of power supply. The so-called special is mainly because the technical index requirements for measuring the power supply are different from those of the commonly used power supply, mainly because the output voltage is particularly high, the output current is particularly large, or the stability, dynamic response and ripple requirements are particularly high, or the output voltage of the power supply is required. Or the current is pulsed or some other requirement. This makes the design and production of such power supplies more special or even stricter than ordinary power supplies.
Features of special power supply(1) Low working voltage
(2) The working current is not large
(3) Small package size
(4) Perfect protection measures
(5) Low power consumption and power-off function
(6) There is a power supply working status signal output
(7) High output voltage accuracy
(8) New combined power IC
Several types of special power1) High voltage power supply for radar transmitter
In modern radar transmitters, traveling wave tubes (TWT) are used as microwave power amplifiers in a large proportion. As a high-power part, its reliability and technical indicators have a direct impact on the radar transmitter and even the entire radar. . The high-voltage power supply (system) supporting the traveling wave tube is even more important. As a high-frequency and high-efficiency power electronic technology, switching power supply technology has been developed with the continuous updating of electronic components and products and the upgrading of high-power devices. The high-voltage switching power supply for radar traveling wave tube introduced in this paper can adopt the full-bridge resonant PWM modulation method. Various protection functions.
2) High-power high-voltage power supply for electron beam welding machine
Electron beam welding is widely used in many industries such as aerospace, atomic energy, national defense and military industry, automobiles and electrical and electrical instruments because of its advantages of no electrode, not easy to oxidize, good process repeatability and small thermal deformation. The basic principle of electron beam welding is that the cathode in the electron gun emits electrons due to direct or indirect heating, and the electrons can form an electron beam with extremely high energy density under the acceleration of a high-voltage electrostatic field through the focusing of the electromagnetic field, and use this electron beam to bombard The workpiece, the huge kinetic energy is converted into heat, which melts the workpiece at the welding place to form a molten pool, so as to realize the welding of the workpiece.
3) High voltage pulse power supply
In radar navigation equipment, the transmitting part generally needs a high-voltage, narrow-pulse, strong-power pulse source with different repetition frequencies. This kind of high-power pulse source generally raises the mains power to several kilovolts to tens of kilovolts of DC high voltage through a high-voltage power supply, and then modulates the DC high voltage into a pulse source with the required pulse width and frequency by a modulator for the launch tube. use.
Application of special power supplySpecial power supplies are generally designed for special loads or occasions, and they are widely used. Mainly include: electroplating and electrolysis, anodizing, induction heating, medical equipment, power operation, power test, environmental protection dust removal, air purification, food sterilization, laser infrared, photoelectric display, etc. In national defense and military, special power supplies are more irreplaceable for ordinary power supplies, mainly used for radar navigation, high-energy physics, plasma physics and nuclear technology research.
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