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HY-3025 Dataheets PDF



Part Number HY-3025
Manufacturers PerkinElmer Optoelectronics
Logo PerkinElmer Optoelectronics
Description Thyratrons
Datasheet HY-3025 DatasheetHY-3025 Datasheet (PDF)

D A T A S H E E T Lighting Imaging Telecom High Energy Switches Thyratrons Description Thyratrons are fast acting high voltage switches suitable for a variety of applications including radar, laser and scientific use. PerkinElmer’s thyratrons are constructed of ceramic and metal for strength and long life. Over 300 thyratron types are available from PerkinElmer. The types listed in this guide are a cross section of the broad line available. We encourage inquiries for thyratrons to suit you.

  HY-3025   HY-3025



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D A T A S H E E T Lighting Imaging Telecom High Energy Switches Thyratrons Description Thyratrons are fast acting high voltage switches suitable for a variety of applications including radar, laser and scientific use. PerkinElmer’s thyratrons are constructed of ceramic and metal for strength and long life. Over 300 thyratron types are available from PerkinElmer. The types listed in this guide are a cross section of the broad line available. We encourage inquiries for thyratrons to suit your particular application. Features • Wide operating voltage range • High pulse rate capability • Ceramic-metal construction • High current capability • Long life . www.perkinelmer.com/opto How a Thyratron works The operation of the device can be divided into three phases: triggering and commutation (closure), steady-state conduction, and recovery (opening), each of which is discussed below. The commutation process is simply modeled as shown in Figure 2. The time interval between trigger breakdown of the grid-cathode region and complete closure of the thyratron is called the anode delay time. It is typically 100-200 nanoseconds for most tube types. During commutation, a high voltage spike appears at the grid of the thyratron. This spike happens in the time it takes for the plasma in the grid-anode space to "connect" to the plasma in the gridcathode space. During this time, the anode is momentarily "connected" to the grid thereby causing the grid to assume a voltage nearly that of the anode’s. Although the grid spike voltage is brief in duration, usually less than 100 nS, it can damage the grid driver circuit unless measures are taken to suppress the spike before it enters the grid driver circuit. The location of the grid spike suppression circuit is shown in Figure 3, Grid Circuit. Figure 4, Typical Grid Spike Suppression Circuits, shows the more common methods used to protect the grid driver circuit. In using any of these types of circuits, care must be exercised to assure that the Grid Driver Circuit pulse is not attenuated in an unacceptable manner. The values for the circuit components are dependent on the characteristics of the thyratron being driven, the ANODE CONTROL GRID (G2) AUXILIARY GRID (G1) CATHODE Figure 1. Thyratron with auxiliary grid (heater detail not shown) Triggering and Commutation When a suitable positive triggering pulse of energy is applied to the grid, a plasma forms in the grid-cathode region from electrons. This plasma passes through the apertures of the grid structure and causes electrical breakdown in the high-voltage region between the grid and the anode. This begins the process of thyratron switching (also called commutation). The plasma that is formed between the grid and the anode diffuses back through the grid into the grid-cathode space. "Connection" of the plasma in the anode-grid space with the plasma in the cathode-grid space completes the commutation process. e e 1. Trigger pulse applied to control grid. .


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