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Principle and characteristics of high frequency DC power supply

Publisher: Administrator Date:2021-03-05

High-frequency DC power supply is suitable for large power plants, hydropower plants, ultra-high voltage substations, unattended substations as control, signal, protection, automatic reclosing operation, accident lighting, DC oil pump, and the opening and closing of various DC operating mechanisms. The instrumentation of the secondary circuit, the control of the automation device, the DC power supply of the electric device such as the AC uninterrupted power supply.
Single-line principle of high-frequency DC power supply:
The high-frequency DC power supply consists of four units: charging screen, feeder screen, storage battery and DC voltage converter. The charger screen is composed of several power modules and a microcomputer monitoring system. The maximum configuration of a single cabinet (screen) is 160A. If a larger output current is required, multiple cabinets (screens) can be connected in parallel. The feeder screen is equipped with a microcomputer insulation on-line monitoring device. When a grounding accident occurs in a feeder branch, it can display the branch number and ground resistance of a certain branch. The battery screen can be equipped with a microcomputer battery inspection device to monitor the battery status at any time. The DC voltage transmitter can be a high-frequency DC transmitter. When the voltage of the closing bus changes from 180 to 300V, the output voltage of the control line bus can be firmly stabilized at 220V.
Shenzhen Sanxinda power supply equipment is a professional power supply manufacturer that produces electroplating power supply, electrolysis power supply, oxidation power supply, electrophoresis power supply and surface treatment power supply. The company adheres to the business philosophy of quality-oriented, energy-saving, and environmental protection, and strives to provide users with high-performance, high-efficiency, and high-reliability surface treatment power equipment.

SXD-PWH series high frequency switching power supply is a high frequency switching power supply originally developed and successfully developed by our factory. It has a completely different working principle from the previous power frequency silicon controlled rectifiers. It generates low voltage and large current output through the input high voltage AC rectifier-high voltage filter-high voltage and high frequency regulation-low voltage and high frequency rectification. Its working principle determines that the power supply has higher conversion efficiency and higher current conversion efficiency than the silicon controlled rectifier. Power factor has become the preferred power supply product for many customers. Using this power supply can significantly reduce production costs and improve product quality. Compared with thyristor power supplies, production energy consumption can be reduced by 20%-30%, bringing considerable economic benefits to users . The power supply is small in size and light in weight (water-cooled is smaller than air-cooled), and it is very easy to install and use, which can save valuable production space for users. The main power high frequency transformer of SXD-PWH series high frequency switching power supply adopts imported nano crystal/ultramicro crystal, high permeability material as the magnetic core, which is small in size and high in efficiency.
High-frequency and high-power switching components (IGBT), power drive modules, and three-phase bridge stack are all selected from international famous brands such as Mitsubishi, Fuji, Freetech, Germany, etc. The circuit board components are all selected from famous manufacturers. Our company has developed a unique water-cooled high-frequency electroplating power supply (patent pending), which has better cooling effect, anti-salt spray acidification, increases the service life of the power supply in harsh environments, and has stronger corrosion resistance, which can greatly extend the service life of the power supply. The water discharged from the machine is free of any pollution and can be recycled and reused!
SXD-PWH series high frequency switching power supply has complete protection functions: input phase loss, undervoltage, overheating, overcurrent, short circuit protection, safe and reliable.

The SXD-SS-SR series high frequency switching power supply has the following advantages compared with the ordinary switching power supply in the same market:
1. The full-bridge phase-shift soft switching control method is adopted to eliminate the switching stress to the greatest extent, and the world's latest full-bridge soft switching control IC is adopted, which has the function of automatically adjusting and setting the trigger pulse sequence parameters to achieve the best IGBT switching time. The IGBT switching loss is minimized, and the IC with its own synchronous rectification drive function is adopted, which simplifies the synchronous rectification drive circuit. Make its work more stable and reliable.
2. Adopt advanced logic interlock control circuit to eliminate pulse false trigger and overcome bridge arm short circuit.
3. It eliminates the magnetic bias problem, mainly in the following two aspects:
(1) The primary transformer of the main transformer uses series blocking capacitors
(2) Add an automatic bias correction circuit
4. Using foreign original imported MOS tube as the secondary side rectifier device, and using advanced and reliable special imported synchronous rectifier module technology, the efficiency of this high-frequency switching power supply is about 15% higher than that of similar ordinary rectifying switching power supplies under low-voltage and high-current conditions.
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