Device for timing and power level setting for microwave applications

4th ModTech International Conference - Modern Technologies in Industrial Engineering

Ursu, M.-P.^1 ; Buido, T.^2

University of Oradea, Department of Computer Science and Information Technology, Faculty of Electrical Engineering and Information Technology, str.Universitii nr.1, Oradea

410087, Romania^1

University of Oradea, Department of Machine Manufacturing Technology, Faculty of Managerial and Technological Engineering, str.Universitii nr.1, Oradea

410087, Romania^2

关键词: Abnormal operating conditions;    Division factors;    Electronic device;    Electronic driving;    Microwave applications;    Output power levels;    Passive electronic components;    Technological process;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/145/5/052015/pdf
DOI  :  10.1088/1757-899X/145/5/052015

来源: IOP

【 摘 要 】

Nowadays, the microwaves are widely used for various technological processes. The microwaves are emitted by magnetrons, which have strict requirements concerning power supplies for anode and filament cathodes, intensity of magnetic field, cooling and electromagnetic shielding. The magnetrons do not tolerate any alteration of their required voltages, currents and magnetic fields, which means that their output microwave power is fixed, so the only way to alter the power level is to use time-division, by turning the magnetron on and off by repetitive time patterns. In order to attain accurate and reproducible results, as well as correct and safe operation of the microwave device, all these requirements must be fulfilled. Safe, correct and reproducible operation of the microwave appliance can be achieved by means of a specially built electronic device, which ensures accurate and reproducible exposure times, interlocking of the commands and automatic switch off when abnormal operating conditions occur. This driving device, designed and realized during the completion of Mr.Ursu's doctoral thesis, consists of a quartz time-base, several programmable frequency and duration dividers, LED displays, sensors and interlocking gates. The active and passive electronic components are placed on custom-made PCB's, designed and made by means of computer-aided applications and machines. The driving commands of the electronic device are delivered to the magnetron power supplies by means of optic zero-passing relays. The inputs of the electronic driving device can sense the status of the microwave appliance. The user is able to enter the total exposure time, the division factor that sets the output power level and, as a novelty, the clock frequency of the time divider.