High voltage high frequency pulse DC power supply

Noah plasma power supply square wave output type has the advantages of higher instantaneous voltage and current than common pulse power supply, steep rising slope (372ns from 0 to the highest voltage), high plasma energy density, good degradation effect.

HOME ꅀ Pulsed Plasma Power Supply ꅀ High voltage high frequency pulse DC power supply

ꄲNext： null

ꄴPrevious： null

Plasma Power Supply

(High voltage high-frequency pulse DC power supply, high voltage narrow pulse power supply)

control cabinet high voltage generator

Composed of two parts:

1. Control cabinet: frequency conversion, pulse modulation, and power control system;
2. High voltage generator: boosts, rectifies, and outputs high-voltage pulse current.

Power Output Waveform:

Application Scenarios:

A. Plasma deodorization: ionization+advanced electrochemical oxidation to remove various industrial odors.
B. Removing white smoke: White smoke is actually a mixture of haze, fog droplets, and particulate matter. The exhaust gas humidity is too saturated, and ordinary pure DC power supplies will ignite and cannot work properly. Noah plasma power supply is a pure pulse square wave power supply that does not ignite in a humidity supersaturated environment and operates stably at high voltage; Pulse power supply has high energy and can capture droplets and dust as small as 1 micron, so it can remove white smoke.

C. Excluding yellow smoke: Yellow smoke is the use of nitric acid in industrial production. Nitric acid is extremely unstable, and the nitrogen dioxide produced by decomposition is brownish red, also known as yellow smoke. Noah plasma power supply, with an energy of 20eV, undergoes advanced electrochemical oxidation to form NO3. NO3 dissolves into weak nitric acid when it comes into contact with water, and is adsorbed onto the anode as droplets. It is neutralized by spraying alkaline water to clean the electric field. The yellow smoke has been eliminated.

D. Removing green smoke: Green smoke is composed of small particles, usually with a diameter of 1 micron to 10 microns. This is the case with the green smoke produced by smoking. Ordinary DC power sources cannot charge it, but Noah's electricity uses high-voltage pulse DC power sources with high energy to charge it negatively, and then deposits it on the anode tube wall under the force of an electric field, achieving the effect of removing green smoke. The green smoke produced by metal drawing plants, chemical plants, heat treatment plants, smoke plants, and asphalt plants can all be removed.

E. Dust removal: High voltage pulse DC power supply with unique breakthrough corona sealing and anti corona functions.
F. Other industries with special purposes:

(1) High frequency high-voltage pulse DC power supply plays a crucial role in the process of X-ray generation. It is mainly used to provide high voltage to the cathode and anode of X-ray tubes. Under high voltage, the electrons at the cathode acquire sufficient energy to rapidly impact the anode target material. When these high-speed electrons suddenly decelerate, some of their kinetic energy is released in the form of X-rays, producing X-rays that are used in various fields such as medical imaging and industrial testing.

(2) The high-frequency high-voltage pulse DC power supply mainly has the following functions in electric puncture disinfection and sterilization. High frequency and high-voltage pulses can generate strong electric fields. This strong electric field can alter the transmembrane potential of microbial cell membranes, leading to the formation of small pores, known as electroporation. When the permeability of the cell membrane is altered, the internal balance of microorganisms is disrupted, causing leakage of cellular contents and resulting in microbial death. At the same time, pulsed electric fields can also cause charged particles inside microbial cells to move vigorously under the action of the electric field, collide with each other, and destroy the structure inside the cell, such as ribosomes, nucleic acids and other biomolecules, thereby achieving the effect of disinfection and sterilization.

(3) High frequency high-voltage pulse DC power supply can also be used for ion implantation process in chip production.

Technical Parameters:

Project	Parameter	Remark
Single module power	12kW	With pulse synchronization technology, multiple machines can be connected in parallel for expansion
Output voltage (average value)	10-100kV	Suitable for deodorization with large air volume , same pole distance > 400mm
Instantaneous voltage (peak value)	1 60 kV	In pulse discharge, due to the high instantaneous potential, the electrons obtain a lot of energy from the electric field, generating high-energy electrons. These high-energy electrons collide with neutral gas molecules to decompose or excite neutral molecules to generate more electrons, and the deodorization efficiency is better.
Output method	DC pulse square wave output	See attached picture
Pulse frequency	80kHz	High frequency pulse square wave output;
Pulse Width	500nS-10μS	Low voltage side PWM modulation pulse, high pulse accuracy
Pulse Energy	20eV	Can break the chemical bonds of most known chemical gases
Modulation	Low voltage side PWM modulation	More stable and reliable than high-voltage side modulation
Power efficiency	>95%	Working condition test results
Installation	Can be installed in separate parts or as a whole	The control cabinet can be placed indoors for easy operation and protection of electronic equipment . The controller and transformer can be separated by 1000m.
Use life	20 years

Product selection and configuration:

The product specifications of Noah's high-voltage high-frequency pulse DC power supply (plasma power supply, high-voltage narrow pulse power supply) are divided according to the rated output voltage (i.e. rated secondary voltage) and rated output current (i.e. rated secondary current) of the high-voltage transformer, indicating the output voltage of the equipment. The rated output voltage is divided into eight levels: 20kV, 30kV, 40kV, 50kV, 60kV, 72kV, 80kV, and 100kV, corresponding to pole distances of 63mm, 110mm, 133mm, 159mm, 219mm, 273mm, 360mm, and 400mm.
The maximum rated output power is 12kw. Power/voltage is divided into eight levels, and there is a deviation in the controller module corresponding to each level or different power.
For different configurations and requirements, please contact our company for detailed solutions

According to the load specifications:

Current configuration based on anode area: 0.3~2.00mA/m2;
Power configuration based on gas displacement: 40000m3/12-24kW (depending on specific operating conditions);
The heat dissipation method is selected according to the working conditions: default compressor water cooling.

2kW single module control cabinet + high voltage generator

24kW two modules control cabinet + high voltage generator

36kW three modules control cabinet + high voltage generator

60kW five modules control cabinet + high voltage generator

Performance comparison between ordinary power frequency

DC power supply and Noah plasma power supply:

Serial number	Project Name	Ordinary industrial frequency DC power supply	Noah Plasma Power Supply
1	Grid input side	Two-phase, unbalanced	Three-phase, balanced
2	Output power mode	DC, large ripple	80kHz pulsed DC square wave; high-frequency narrow pulse, the higher the power supply frequency, the smaller the electric field capacitive reactance, and the greater the energy injected into the electrostatic precipitator by the power supply.
3	Output voltage fluctuation	30%	1%
4	Spark off time	Thyristor control, 10ms	IGBT switch control + PWM pulse width modulation, 25us
5	Power efficiency	<75%	>95%
6	Power Factor	<78%	>93%
7	Power supply volume and weight	Larger	Smaller
8	Energy consumption	high	Very low, saving 80% compared to industrial frequency power supply
9	Control type	Thyristor voltage regulation control millisecond control	PWM width modulation, microsecond response speed
10	Flashover characteristics	It cannot respond quickly to flashover shock, and the output current takes a long time to gradually drop to zero.	The device automatically tracks the critical point of the electric field breakdown voltage by adjusting the pulse width. The electric field is not prone to flashover, achieving optimal power output.
11	Arc ignition	When ignition is on, the power is turned off directly	First, some pulses are turned off, and the power supply remains in working state. After the pulses are turned off, the energy decreases, the arc disappears, and the power supply resumes normal operation. The power supply is only turned off for protection if an arc is generated .
12	Electric water jet cleaning	No water spraying with electricity	The electrostatic field can be cleaned by spraying water without stopping the power supply
13	Anti-corona situation	Industrial frequency DC power supply generates back corona. After the back corona phenomenon occurs, the dust removal efficiency drops significantly.	The plasma power supply does not produce back corona. The instantaneous high voltage of the pulse wave makes it easier to charge the dust, so the dust removal efficiency is greatly improved.
14	Dust collection and purification efficiency	During the process of particle charging by DC corona, as the charge of particles increases, potential barrier energy is generated on the particle surface. Charging occurs only when electrons with kinetic energy greater than or sufficient to overcome the surface potential barrier energy of charged particles collide with particles. Electrons with kinetic energy lower than the surface potential barrier energy of charged particles cannot reach the particle surface and are not charged. When charging reaches a certain stage, the charging speed of dust decreases, which affects the charge of dust and causes low dust removal efficiency.	30% higher efficiency than ordinary DC. In pulse discharge, due to the high instantaneous potential, the energy obtained by electrons from the electric field is very large, generating high-energy electrons. These high-energy electrons collide with neutral gas molecules to decompose or excite neutral molecules to generate more electrons. At this time, the charged particles in the electric field space are mainly electrons, and the corona current is formed by electron transmission. The charge of fly ash particles is mainly electron charge. The electron charging mechanism of fly ash in the corona field of pulse discharge is mainly based on the electric field charge and kinetic energy diffusion charge of electrons. The electron charge of fly ash particles is not only related to the electric field strength, but also to the degree of thermal motion of electrons (i.e., the kinetic energy of electrons). During the pulse period, the density of excited electrons in a unit space is very large and the energy is very high. The high-energy electrons are sufficient to overcome this potential barrier and bombard the surface of fly ash particles to make the particle charge exceed the limit of saturated electric field charge, thereby obtaining a faster approach speed and improving dust removal efficiency.
15	Adaptability to working conditions	Some scenes are available	Available in all scenarios
16	Yellow smoke removal effect	Ordinary DC has no yellow smoke removal function	We have done an experiment where copper was added to nitric acid to produce NO2 _yellowsmoke. In the absence of alkali neutralization spraying, the yellow smoke could be purified .
17	Dust removal efficiency and power consumption	It can collect dust but consumes a lot of electricity. A set of dust removal power supply consumes 50~60 kWh of electricity per hour.	The dust removal efficiency is increased by 30%. A set of dust removal power supply consumes about 10 kWh of electricity per hour. It saves 40kw of electricity per hour, 960kw per day, 28,800kw per month, and 288,000kw per year (calculated based on 10 months ). If the electricity fee is 0.5 yuan per kWh, it saves 144,000 yuan per year.
18	Capture of high resistivity and fine dust	Difference	Good. Capture of high resistivity dust, capture of fine dust. The emission of fine dust is a key indicator affecting the dust emission concentration of electrostatic precipitator. The instantaneous high-intensity electric field corona generated by high-frequency double narrow pulse power supply greatly improves the capture of PM2.5 and below particles.
19	Transformer Features	Ordinary DC is an industrial frequency transformer with oil temperature of 100~120 degrees.	The high-frequency transformer is small in size and the temperature rise does not exceed 25K.
20	Machine structure and protection		The transformer and control cabinet can be installed together or separately. The display screen is installed in the control room and connected via RS485 communication or optical fiber .

Working principle:

The natural advantage of Noah plasma power supply's pulse square wave output power supply is that it has higher instantaneous voltage and current than common stacked or composite pulse power supplies, and the rising edge slope is steeper (from 0 voltage to the highest voltage, only 372ns is needed). Therefore, the plasma generated by the power supply has higher energy density, better ionization and advanced oxidation effects.

(1) Noah plasma power supply is composed of three-phase AC power input, rectified, and converted into high-frequency pulse AC power through IGBT inverter. It is then boosted by a high-frequency high-voltage transformer and rectified to output high-frequency high-voltage pulse DC power.

(2) The power core component IGBT adopts Infineon, and the main heating part adopts low-power refrigeration with strong water cooling. In summer, when the outdoor temperature is 50 degrees, the temperature of the heating component will not exceed 45 degrees. The step-up transformer has a high frequency, small size, and a temperature rise not exceeding 25K. Our company has isolation treatment between the high-voltage transformer and IGBT, so there will be no extreme accidents of high-voltage series back burning IGBT.

(3) The power supply mainly consists of a controller module, a high-voltage transformer module, and a water cooling system. In engineering applications, it can be integrated in parallel according to the user's load requirements to provide higher output power.

① Each standard control module has complete functionality and can be used independently.
② Each high-voltage transformer module has a separate sampling device.
③ Each power supply is equipped with remote bus communication function.
④ Each controller module is paired with a high-voltage transformer module.
⑤ Each controller module comes with a PWM constant current control function, which includes short-circuit, overcurrent, overvoltage, overtemperature, open circuit, and arc extinguishing functions.
⑥ Each set of power supply can realize Internet, remote control, remote maintenance and remote supervision through remote communication, and users can achieve the goal of unattended.

Electrical Schematic Diagram:

Power Output Waveform:

Technical advantages:

(1) In 2021, the Ministry of Ecology and Environmental Protection recommended advanced demonstration technologies.

(2) Noah Electric has completely independent intellectual property rights. Noah Company has strong research and development capabilities, and its technical leader is a senior engineer at the Institute of High Energy Physics, Chinese Academy of Sciences. In 2016, he was invited to work at Chengdu Electronics 29th Institute under the Sichuan Province Thousand Talents Program and is currently the Chief Engineer of Noah Company. We have a professional technical research and development team of nearly 30 people, and have applied for 5 invention patents, over 30 utility model patents, and more than 10 software copyrights around one of our core technologies.
Noah's plasma power supply has overcome two major technical difficulties:

① Pulse square wave output instead of peak output;
② The discharge waveform satisfies the complete Thomson discharge curve without relaxation state. The Thomson discharge curve is considered a core indicator for measuring whether the standard plasma state has been achieved. The operating frequency of Noah's plasma power supply is 80kHz, and it implements a DC pulse square wave output form.
(3) High discharge energy density, high power, and good effect.
① High repetition rate, 80000 pulses per second DC square wave; Typical plasma method width: 500nS-10uS. Ultra high frequency=ultra-high energy, bombarding exhaust gas molecules to break their molecular bonds.
② Low voltage side modulation pulse, adjustable pulse width, high IGBT control accuracy, and reliable long-term operation of the equipment.
③ Fiber optic communication, capable of operating from 1 kilometer away; Internet of Things function, controllable by mobile phone;
④ The deodorization efficiency is over 95%.

(4) Complete Tang Sheng discharge curve without relaxation state.
The measured discharge waveform conforms to the Thomson discharge curve, which is considered a core indicator for the formation of active particles in standard discharges.

(5) Low construction cost and low operating cost.
According to experience, with a power consumption of 20000 air volumes and 6-12kw (depending on the odor), the energy consumption is lower compared to other processes; No consumables.

(6) Strong applicability.
There are a large number of active particles such as high-energy electrons, free radicals, dissociated atoms, excited state molecules, and positive ions in the reaction chamber, which can degrade pollutants indiscriminately. At the same time, it has functions such as pollutant degradation, dust removal, dehydration, and deodorization, making it a "multi-purpose machine" that eliminates multiple pretreatment equipment.

(7) Security.
In the process of process design, safety was comprehensively considered:
① The use of large-diameter anode tubes is specifically designed to prevent cathodic discharge;
② Connect grounding wires to equipment and air ducts to prevent sparks caused by static electricity and local flash fires;
③ Install an anti backfire device at the intake end of the system to prevent flames from spreading towards the workshop direction;
④ Explosion relief fins are installed at appropriate positions on the plasma method device, which can release pressure immediately even in the event of flashover;
⑤ The plasma controller has an automatic arc extinguishing function. When the program detects that the arc length exceeds our set value, the power supply will automatically extinguish the arc; When there is a potential risk of ignition in the device, the power supply will actively reduce the voltage, thereby extinguishing the arc.