LS-4101 datasheet(3/6 Pages) PERKINELMER

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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

Số phần tương tự - LS-4101

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
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