In life, we always come into contact with this familiar thing, which is closely related to our lives, but we know very little about it. Now, I will explain to you in detail a power supply that can work under thousands of volts of direct current, and even work under tens of thousands of volts through AC input and three-phase power supply. It is a high-voltage DC power supply. So do you know the characteristics and applications of high-voltage DC power supplies? Why do vacuum cleaners use high-voltage DC power supplies?
1. What is a high-voltage DC power supply?
High-voltage DC power supply, also called DC high-voltage power supply, is a voltage regulator with stable current and large output power, which can reach several kilowatts. The frequency of the old high-voltage DC power supply is not as high as it is now, and the power supply is so large that several people cannot move it. The conversion efficiency and stability are much lower than those of modern high-voltage DC power supplies. However, with the improvement of circuit breaker technology, high-frequency circuit breaker conversion technology has begun to be applied to high-voltage power, and its energy storage is very stable, safe and reliable.
In order to meet the various requirements of a wider range of applications, modern high-voltage DC power supplies can already achieve automatic voltage stabilization conversion, which makes the performance of high-voltage DC power supplies a "fixed" mode, which is a good model for the development of future power supplies.
2. What are the uses of high-voltage DC power supplies?
At present, many high-voltage DC power supplies are manufactured as voltage regulators that can provide DC power to various high-power devices, such as deuterium lamp power supplies, xenon lamp power supplies, zinc lamp power supplies and other analytical instrument light sources. And vacuum equipment such as avalanche tubes can also benefit from high-voltage DC power supplies, which we call electron guns, X-ray tubes, etc. High-voltage DC power supplies also support the development of clinical medicine, and we may also encounter a form of power supply, that is, high-voltage DC power supplies in many rooms with large computer equipment.
3. What are the characteristics of high-voltage DC power supply systems?
High-voltage DC power supply systems can be widely used in certain important equipment in all computer systems using LCD display screens, such as IDC computer rooms, financial systems, investment companies, aerospace control, medical equipment, data management systems, etc., to provide uninterrupted DC power supply.
System characteristics:
3.1 The battery of the high-voltage DC power grid is located at the output end. In the event of a system failure, the battery can power the load without interrupting the power supply of the system.
3.2 The parallel connection of the high-voltage DC power supply system is DC parallel connection, with only the problem of the same potential, which is easy to control. Failure of parallelization will not paralyze the system, at best it can only be said to be an unbalanced flow.
3.3 The number of parallel high-voltage DC power supply systems is unlimited. Usually 40 units can be connected in parallel.
3.4 The high-voltage DC power supply system uses N+X parallel connection. The load of the entire system works at a load of 60% to 70%. The efficiency of the whole machine can reach more than 92%. The presence of battery, N+1 or N+X redundant parallel connection will cause module failure, and the system will not output the "ultimatum" signal. At best it is just an early warning.
3.5 The high-voltage DC power supply system adopts the integrated monitoring system of the configuration type, distributed control and centralized management design ideas. Each sub-monitoring unit is equipped with its own microprocessor, which runs independently, and each realizes its own control, improving the function of the reliability of the entire system.
3.6 The monitoring unit adopts a modular structure, and different numbers of modules can be configured according to the output capacity of the system and the number of feed distribution channels to meet the different requirements of users. This modular module design gives you more flexibility in system configuration.
3.7 The high-voltage DC power supply system is easy to wire, maintain, and can be connected online instantly.
3.8 The high-voltage DC power supply system is reliable, maintainable, has low investment cost, low energy consumption, and small footprint.
3.9 The input voltage range is wide and adaptable.
3.10 The system has complete battery management and insulation monitoring functions.
4. The principle of high-voltage DC power supply in dust removal in vacuum cleaners
A narrow pulse voltage waveform with a pulse width of 100μS or less is superimposed on the basic DC high voltage, and a sharply rising pulse voltage is applied to the electric field electrode to make the corona distribution uniform and generate a strong corona discharge corona wire on the corona electrode. The internal breakdown voltage of the electric field is greatly improved to make the dust more charged. At the same time, the corona current can be adjusted by changing the pulse repetition frequency without increasing or decreasing the peak voltage, and dust collection can be achieved at a lower current density.
Main technical indicators: dust emission concentration and operating energy consumption can be reduced by more than 30% respectively.
Technical features: Improve the charging efficiency of dust (especially fine dust), which greatly improves the dust removal efficiency and reduces the operating energy consumption. After the conversion is completed, the outlet particulate matter emission concentration is 16.91mg/m3, the pulse power supply can reduce particulate matter emissions by more than 30%, and the operating energy consumption of the high-voltage power supply is reduced by 30%-70%.
5. Why does the vacuum cleaner use a high-voltage DC power supply?
According to the technical route of superimposing pulse high voltage on basic DC high voltage, it is planned to divide the pulse high-voltage power supply into two parts: basic DC high-voltage unit and pulse high-voltage unit. The two units are designed with separate structures. Among them, the basic DC high-voltage unit uses the original power frequency three-phase high-voltage unit, and adds a high-voltage isolation switch cabinet, adding a high-voltage isolation switch cabinet with two inlets and one outlets of basic DC high voltage and pulse high voltage, and the pulse high-voltage unit corresponds to a series LC resonant circuit.
Main process operation and control parameters: input power three-phase AC 380V/50Hz, rated output basic DC voltage 72kV, rated output basic DC current 1600mA, rated load capacity 115nF, rated output pulse peak voltage 80kV, pulse width 85μS, pulse repetition frequency from 1PPS to 120PPS, the maximum spark rate allowed by the equipment is 60 times/minute.
Energy and resource conservation and comprehensive utilization can reduce dust emissions by more than 30% and reduce operating energy consumption by 30% to 70%.
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