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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LS-5101 데이터시트(PDF) 2 Page - PerkinElmer Optoelectronics |
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LS-5101 데이터시트(HTML) 2 Page - PerkinElmer Optoelectronics |
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2 / 6 page  How a Thyratron works The operation of the device can be divided into three phases: trig- gering and commutation (closure), steady-state conduction, and recovery (opening), each of which is discussed below. Triggering and Commutation When a suitable positive trigger- ing pulse of energy is applied to the grid, a plasma forms in the grid-cathode region from elec- trons. 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 thyra- tron switching (also called com- mutation). 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 com- pletes the commutation process. The commutation process is sim- ply 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 volt- age 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 "con- nect" to the plasma in the grid- cathode space. During this time, the anode is momentarily "con- nected" to the grid thereby caus- ing 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 cir- cuit. 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 cir- cuits, care must be exercised to assure that the Grid Driver Circuit pulse is not attenuated in an unac- ceptable 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) e e 1. Trigger pulse applied to control grid. 2. Grid-cathode breakdown. 3. Electrons from grid-cathode region create a dense plasma in the grid-anode region. The plasma front propagates to- ward the cathode via break- down of gas. 4. Closure Figure 2. Thyratron commutation Propagating Plasma Front |
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