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LS-5002 Scheda tecnica(PDF) 3 Page - PerkinElmer Optoelectronics |
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LS-5002 Scheda tecnica(HTML) 3 Page - PerkinElmer Optoelectronics |
3 / 6 page grid driver circuit design, and the performance required from the thyratron itself. Contact the appli- cations engineering department at PerkinElmer to discuss the spe- cific details of your requirement. Conduction Once the commutation interval has ended, a typical hydrogen thyratron will conduct with near- ly constant voltage drop on the order of 100 volts regardless of the current through the tube. Recovery Thyratrons open (recover) via diffusion of ions to the tube inner walls and electrode surfaces, where the ions can recombine with electrons. This process takes from 30 to 150 microseconds, depending on the tube type, fill pressure, and gas (hydrogen or deuterium). The theoretical maxi- mum pulse repetition rate is the inverse of the recovery time. Recovery can be promoted by arranging to have a small nega- tive DC bias voltage on the con- trol grid when forward conduc- tion has ceased. A bias voltage of 50 to 100 volts is usually suffi- cient. Recovery can also be improved by arranging to have small nega- tive voltage on the anode after forward conduction has ceased. In many radar circuits, a few-per- cent negative mismatch between a pulse-forming network and the load ensures a residual negative anode voltage. In laser circuits, classical pulse-forming networks are seldom used, so inverse anode voltage may not be easily generated. Recovery then strong- ly depends on the characteristics of the anode charging circuit. In general, charging schemes involving gently rising voltages (i.e., resonant charging and ramp charging) favor thyratron recov- ery, and therefore allow higher pulse repetition rates. Fast ramp- ing and resistive charging put large voltages on the anode quickly, thus making recovery more difficult. The ideal charging scheme from the viewpoint of thyratron recovery is command charging, wherein voltage is applied to the thyratron only an instant before firing. (a) Filter (b) Zener (c) MOV (d) Spark Gap Figure 4. Typical Grid Spike Suppression Circuits CURRENT LIMITING AND/OR MATCHING RESISTOR Figure 3. Grid Circuit GRID SPIKE SUPPRESSION CIRCUIT GRID DRIVER CIRCUIT |
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