What is a high-voltage DC power supply? A high-voltage DC power supply usually refers to a power supply with an output voltage greater than 5000 volts. Generally, the output voltage of a high-voltage DC power supply can reach tens of thousands of volts or even hundreds of thousands of volts or even higher. There are two types of DC high-voltage DC power supplies: linearly regulated high-voltage DC power supplies and switch-type regulated high-voltage DC power supplies.
1. What is a high-voltage DC power supply?
A high-voltage DC power supply usually refers to a power supply with an output voltage greater than 5000 volts. Generally, the output voltage of a high-voltage DC power supply can reach tens of thousands of volts or even hundreds of thousands of volts or even higher. There are two types of DC high-voltage DC power supplies: linearly regulated high-voltage DC power supplies and switch-type regulated high-voltage DC power supplies.
There are two main technical development directions: increasing the power of the power supply, that is, high voltage and high current; reducing the volume of the power supply, that is, high voltage and small volume. Reducing the volume of the power supply is mainly to increase the switching frequency of the power supply. High-power power supplies tend to be larger in size, while low-power power supplies tend to be smaller and smaller in size. In addition, high conversion efficiency, high load, high precision and low wave are also research directions for high-voltage DC power supplies. For high-voltage DC power supplies used for spectral analysis (such as photomultiplier tube power supplies), low ripple is particularly important, and this indicator will directly affect the accuracy of analytical measurements. At low wavelength, the generated micro high voltage DC power can be controlled within 0.005%.
High voltage DC power supplies are widely used, especially high voltage DC power supplies for X-ray machines, laser high voltage DC power supplies, spectrum analysis high voltage DC power supplies, non-destructive testing high voltage DC power supplies, semiconductor manufacturing equipment high voltage DC power supplies, capillary electrophoresis high voltage DC power supplies, non-destructive testing high voltage DC power supplies, particle injection high voltage DC power supplies in semiconductor technology, physical vapor deposition high voltage DC power supplies (PVD), nanolithography high voltage DC power supplies, used for ion beam deposition, ion beam assisted deposition, electron beam evaporation, electron beam welding, ion source, DC magnetron reactive sputtering, glass/fabric coating, glow discharge, microwave processing high voltage condensation test, CRT display test, high voltage cable interference test (PD test), TWT test, H-Pot test. Particle accelerators, free electron lasers, neutron sources, cyclotrons, capacitive induction pulse networks, Marx high voltage pulse generators, capacitor chargers, microwave heating, RF amplification, nanotechnology applications, electrostatic technology applications, nanofiber electrospinning preparation, core device high voltage DC power supplies and other high voltage DC power supplies.
2. What is a negative high-voltage DC power supply?
The positive pole of the DC high-voltage power supply is grounded to zero potential, and the negative end of the power supply is negative high voltage.
For example, the anode voltage of a picture tube is usually tens of thousands of volts. The negative pole is connected to the cathode. As zero potential, the output is positive high voltage, connected to the positive pole; the oscilloscope high voltage in the oscilloscope is to connect the positive pole to the "ground" to zero potential (add an external deflection signal to the electrode), and the negative high voltage is added to the cathode.
3. The working principle and characteristics of high-voltage DC power supply
With the diversified development of the world, our lives are constantly changing, including the various electronic products we come into contact with. Then you must not know some components of these products, such as high-voltage DC power supply. High-voltage DC power supply, high-voltage switching power supply, high-voltage DC regulated power supply, high-power high-voltage power supply. It is a power supply that is input by AC mains or three-phase power supply and outputs a DC voltage of more than thousands of volts or tens of thousands of volts. The output power is hundreds of watts. Up to several kilowatts, usually stable or stable current. Early DC high-voltage power supplies used AC power or three-phase power to step up the voltage from the industrial frequency high-voltage transformer to AC high voltage, and then rectified and filtered to obtain DC high voltage.
Due to the low frequency, the volume and weight of the power supply are relatively large, and the conversion efficiency and stability are poor. With the development and maturity of switching power supply technology, DC high-voltage power supplies developed using high-frequency switching conversion technology combined with high-voltage power supply characteristics have become mainstream. It is characterized by small size, light weight, high efficiency, high power, low ripple, low energy storage, high stability and high reliability. In order to meet the requirements of different applications, DC high-voltage power supplies are made into a form that automatically converts stable voltage and current.
It is mainly used for gas purification in fertilizer, coking, city gas, metallurgy, building materials, carbon, ceramics and other industries to recover tar in coal gas and coke oven gas, and remove impurities such as dust and water mist, so as to achieve the dual effects of material recovery and gas purification, and it also plays a vital role in ensuring the normal and stable operation of the equipment in the later stage of the process.
High-voltage distributed DC power supply is a new type of DC power supply equipment, mainly used in small switch stations and user terminals as auxiliary control lines (such as microcomputer protection and other intelligent terminals and indicator lights, analog indicators, etc.). Provide reliable and uninterrupted working power supply to avoid the loss of protection for microcomputer protection when the AC power is off, and solve the problem of microcomputer protection failure caused by housing failure due to working overvoltage, harmonics, etc. At the same time, it can also provide DC working power supply for the main switch equipment (spring mechanism vacuum circuit breaker, permanent magnet mechanism vacuum circuit breaker, electrical load switch, etc.) that meets the power requirements of the equipment.
Wall-mounted DC power supply Wall-mounted DC power supply is suitable for small switch stations, small user substations and small 10KV substation systems. It adopts an integrated design concept and consists of a rectifier module, a monitoring module, a step-down unit, a distribution unit and a battery installation box. It has the characteristics of small size, simple structure and independent system. The monitoring module adopts LCD Chinese character menu display, complete system monitoring and battery automation management functions, has four remote interfaces connected to the automation system, provides two communication interface options of RS232 and RS485, and provides three communication protocol options of RTU, CDT, MODBUS.
Micro DC working power supply Micro DC working power supply is mainly used in places such as substations, switching stations, ring network cabinets and box substations. It is a main switch device (vacuum circuit breaker, vacuum contactor, load switch, etc.) and auxiliary control and protection and signal circuits (such as microcomputer protection, remote control unit RTU, load control equipment, indicator light, analog indicator, intelligent instrument, etc.) to provide reliable DC power supply.
High-power high-voltage DC stable current power supply consists of transformer step-down, rectification and filtering, reference power supply circuit, reference voltage circuit, voltage stabilization, steady current comparison amplifier circuit, regulation circuit and steady current sampling circuit. When the output voltage fluctuates due to changes in the power supply voltage or load current, the fluctuation signal will be compared with the reference voltage through the regulator sampling circuit, and the obtained error signal will be amplified by the comparison amplifier, and then fine-tuned by the linear adjustment element to output a high-precision, high-power DC voltage source.
It consists of two major parts: a constant current high-voltage DC power supply and a focus capture body (mechanical tower body). The former uses a CS-Ⅲ constant current type high-voltage DC power supply for electrostatic deposition; the latter can be structured using TD sleeve type (concentric circle type), GD tube type, FD honeycomb type or SJD wet tube type. The bodies of the four structures are mainly composed of a cylinder, a discharge electrode (corona electrode) and a suction electrode (precipitation electrode). In the research and design process, there will definitely be problems of one kind or another, which requires our scientific researchers to constantly sum up experience during the design process, so as to promote continuous innovation of products.
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