## 2 Switched-Mode Power Supply  
The GAD plasma reactor is a non-linear energy receiver, hence the special requirements for switched-mode power supply (SMPS), which is used to supply non-thermal \(\upmu\)GAD discharges. First, the power supply must generate a high voltage, adapted primarily to the type of process gas and the electrodes' distance in the ignition zone, in order for the discharge in the process gas to ignite cyclically without additional ignition electrodes, initial ionization, and radiation. Secondly, it is beneficial for the power supply from the receiver's point of view to have the characteristics of a regulated power source. Therefore, the SMPS source should quickly and efficiently limit the discharge current, which subsequently maintains a stable glow discharge. These SMPS properties have been achieved by combining many standard and custom energy conversion techniques in a pulse inverter. The use of a push-pull topology is common for converters increasing DC voltage by several dozen volts. Here, the push-pull inverter was used to take advantage of the parasitic phenomenon of commutation overvoltage, and thus improve the ignition parameters in \(\upmu\)GAD. The push-pull topology is characterized by a complex primary winding with a tap in its half (two-section winding), to which the inverter's asymmetry is very sensitive. Despite the significant multiplication of voltages, making the primary winding is not complicated; it is much more difficult to design and make a high voltage secondary coil. Push-pull systems show good properties at high frequencies--comparable to full-bridge ones, which limits [PERSON]'s effect. However, they are rarely used to power digital electronics, because the switching surges arising in them require limitation and protection of the output stage, especially for sensitive microprocessor technology. The use of full-bridge push-pull topology is non-standard, due to its properties. Assuming identical parameters of the supply voltage _Uin_, output voltage _Uout_, rated power _Pn_, operating frequency \(f\), and input current _In_, comparing the popular \"H\" full-bridge topology (push-pull), it should be assumed that, in a bridge converter, there are 4 fully controlled connectors and therefore inverter supply voltage _Uin_, inverter output voltage _Us_, voltage on the primary winding _Up_, and voltage on the _Ut_ controllable switches are equal to the supply voltage _Uin_, while the current of the switch _It_ is equal to the input current _In_, and the transformer ratio equals \(N\). In half-bridge push-pull topology, the output voltage of the inverter _Us_ is equal to the supply voltage _Uin_. The voltage at the _Ut_ controlled switch is doubled in the pulsing half-period, which is the result of the simultaneous sum of DC side voltages and the blocked primary winding voltage, which in turn is considered unfavorable in push-pull topology. The voltage on the full primary winding _Up_ is equal to doubled supply voltage _2 Uin_, while the current of the controlled switch _It_ is approximately equal to the input current _In_, and the transformer ratio is 2\(N\). To describe the use of parasitic phenomena during energy conversion, a simplified diagram of this system is outlined in Figure 1. The input side of the power supply is standard for SMPS devices and has an input rectifier and filtering capacitors. There is also a power factor correction (PFC) compensator and a system for pre-charging capacitors. In this way, DC voltage is prepared to supply the push-pull topology converter. These are solutions that are treated as a standard in pulse technology and do not differ in this non-thermal plasma NTP power supply. Therefore, no details are referred to in this article. As it can be seen in Figure 1, the positive pole of the filtered DC voltage is applied to the center tap in the primary coil. The 0 potential is connected alternately to the beginning and the end of the winding, according to the frequency and a pulse period. Executive valves are insulated gate bipolar transistor (IGBT).