Our company is a reliable technology based on experience and achievements of development and design of high voltage / large current pulsed power supply over 30 years, Technical support and customization on generation and control of Pulsed Power We are doing power production · collaborative research (request from universities and companies).
- Examination of specifications
- Examination of Schematic plan
- Design, Assembly, and Evaluation test for the experiment goods(products).(the most suitable miniaturized design to a structural combination with the load, etc.）
- Trouble shooting (Malfunction, Noise, Breakdown, etc.)
- Performance improvement
- Experiment, measurement
- Analysis, Simulation (Circuit calculation, Strength calculation, Electromagnetic field computation, Heat conduction calculation, etc.)
- joint research
- guidance for the students (Electrical circuit, Electric circuit, Electromagnetism, CAD, Circuit simulation, Experiment concerning electricity, electron, and high pressure, etc.)
- Part-time Lecturer (Guidance for Master’s thesis, Graduation thesis, Graduation research)
About Pulsed Power Technology
In order to generate and control the Pulsed Power, the following seven technologies are required.
(1) Power conversion technology
Electricity is usually supplied in exchange at home and at factories. In order to generate Pulsed Power, it is necessary to convert the power supplied by AC to direct current controlled with high accuracy. In recent years, compact, high-efficiency, high-precision power conversion method using a high-frequency inverter circuit has become mainstream.
(2) Energy storage technology
In order to generate Pulsed Power, you first need a receptacle to store the necessary electrical energy. There are two main types of electricity containers.
- Voltage energy storage method using capacitors (capacitive energy)
- Current energy accumulation method using inductor (inductive energy)
In either method, the following performance is an important point.
- Small entrance of necessary electric energy into small containers (small)
- Loss of energy is small when putting in and out of electric energy (high efficiency)
- Ability to take out electric energy steeply (high speed)
Depending on each method, there are advantages and disadvantages, and it is important to select the optimum method according to the application.
(3) Pulse generation technology
In order to generate powerful Pulsed Power, it is the most important point how quickly you can extract the electric energy stored in the above container.
A switch that operates at high speed is used to extract electrical energy, but depending on the energy storage method, the type of switch required is different.
Short-circuit type switch (closing switch) is used for voltage energy accumulation method (capacitive energy) using capacitor.
Apply voltage abruptly to the load by abruptly closing the voltage energy stored in the capacitor.
Since it is usually high voltage and large current, discharge tubes such as tetrode tubes and thyratrons were widely used in the past.
The incidental facilities are complicated, periodic adjustment is necessary, and there is a shortcoming such as a short life span.
In recent years, semiconductor switches are being replaced by semiconductor switches due to the fact that high-voltage, high-current ones are being produced and technical levels connected in series and in parallel.
By using a semiconductor switch, pulse power can be stably generated with high repetition.
Open type switch (opening switch) is used for current energy accumulation method (inductive energy) using inductor.
It abruptly cuts off the current energy stored in the inductor and causes the current to be steeply commutated to the load.
For large scale plasma opening switches using the annihilation of the plasma of the plasma injected into the vacuum are used.
Semiconductor opening switches (SOS) that diverted reverse current suppression characteristics of diodes have been used for small-scale ones.
Pulse compression technology
If the required pulsed power can not be obtained with only the above pulse generation technology, pulse power can be increased by further shortening the pulse. A typical method is a pulse compression circuit using a magnetic switch. Amorphous core, etc., using magnetic saturation characteristics of ferromagnet as a switch, usually the pulse width is compressed to 1/3 to 1/4 per one compression circuit. As pulse width is compressed, pulse power rises. It can also increase the pulse power by 10 times by compressing it in two stages.
Pulse conversion technology
To convert the pulse power to the voltage and current that are ultimately required by the load, use a pulse transformer, a voltage superimposing circuit, or the like. Also, since there are many cases where it is directly connected to the load, in addition to the mechanical strength of the partition wall against the load, a combined examination is required together with insulation pressure resistance, vacuum leakage, emission gas and others. In order to efficiently transmit the pulse power as steep as possible to the load, it is necessary to minimize the stray inductance, stray capacitance, etc. of the structure of this output part and to match it with the load impedance.
In order to generate Pulsed Power accurately, stably and safely, it is necessary to have a function to monitor and control the entire operation so that the above-described functions are coordinated and the whole system operates with optimum efficiency. Recently, it is common to use whole control panel using sequencer and touch panel. Especially for high-speed control and interlock operation, it is increasingly used in combination with digital control such as FPGA, DSP, RISC. Ethernet can also be used for communication with external control.
Noise countermeasure technology
The Pulsed Power generator generates extremely steep pulse power to the load, but if you do not apply normal noise countermeasures, if you make a mistake one step becomes a noise generation device, it will disperse noise to the external equipment installed in the periphery , It may cause measurement noise or cause malfunction, or it may cause the worst, failure. For safe use, appropriate measures are indispensable in order not to emit noise (conductivity, radioactive) to the outside. For this, the optimum design according to the situation of the installation site becomes important, so it is necessary to consider countermeasures together with the user from the design stage including the structural consistency with the load. In addition, it is also important to prevent unnecessary motions and failures beforehand by taking sufficient countermeasures against malfunctions structurally against noise coming from outside.
In collaboration with universities and research laboratories engaged in research on Pulsed Power technology, we aim to become a central institution that systematically fulfills the maintenance, development and succession of Pulsed Power technology in Japan.