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Simultaneous Positive And Negative
0 To +950V and 0 To 鈥?50V Pulse
Outputs
1,900V Differential Output
<15ns Rise And Fall Times
<40ns to DC Pulse Width
>20KHz Pulse Repetition Frequency
Internal High Voltage Power Supplies
Optimized To Drive Deflection Plates,
Pockels Cells, Q-Switches And Other
Capacitive Loads
Economical, Modular Solid State
Design
The PVM-4210 is a compact, OEM-style pulse generator module
providing two simultaneous differential voltage pulses of up to
鹵950V
(1,900V differential), with pulse rise and fall times <15
nanoseconds, and pulse widths continuously adjustable from
<40 nanoseconds to DC. The pulser operates on +24VDC to
+28VDC support power, and features integrated DC high voltage
power supplies.
The PVM-4210 is optimized for differential drive of deflection
plates for electrostatic modulation of particle beams in time-of-
flight mass spectrometers and accelerators. It will also drive any
high impedance, capacitive load such as Pockels Cells and Q
-
Switches, electrodes, microchannel plates, acoustic transducers,
image intensifiers and photomultiplier tubes. The exceptional
pulse fidelity of the PVM-4210 will optimize the performance of
any system in which it is used.
The module provides two pulse output channels, controlled by a
common control logic. When the control logic receives a gate
signal, both channels pulse simultaneously. One channel pulses
from ground to the positive high voltage, and the other channel
pulses from ground to the negative high voltage. Therefore each
output can be connected to the electrodes of a Pockels Cell or
Q-Switch, or to a pair of deflection plates, providing a 1,900V
differential pulse across the cell or plates. These outputs may
also be inverted, to pulse from the high voltage potential to
ground. The width and frequency of the output pulses follow the
width and frequency of the TTL input gate. The amplitude of the
output pulse voltage for each channel is independently adjust-
able from 0 to 950V using screwdriver-adjustable potentiometers
readily accessible on the end panel of the pulser module.
The PVM-4210 requires +24VDC to +28VDC support power and
a TTL gate signal. For safety and control flexibility, a TTL level
signal is used to enable and disable the DC power supplies.
Each channel is a half-bridge (totem pole) design, offering equally
fast pulse rise and fall times, low power dissipation, and virtually
no over-shoot, under-shoot or ringing. The unit has over-current
detection and shut-down circuitry to protect the pulse generator
against potential damage due to arcs and shorts in the load or
interconnect cables.
Unlike some competing solid state switches, the PVM-4210 is a com-
plete pulser solution with high voltage power supplies, energy storage
and output network, ready for use. It can be connected directly to the
load, and does not require series or shunt resistors, impedance-
matching networks between the pulser and the load, or additional en-
ergy storage (capacitor banks). All of this is taken care of within the
PVM-4210. The pulser is housed in an aluminum enclosure, with
threaded mounting holes in the base to simplify installation and assem-
bly in OEM applications.
The PVM-4210 is a direct-coupled, all solid-state design using air
as the primary insulating medium. Its conservative design margin
gives you long component life. And keeping the PVM-4210 free of
potting compound or encapsulation materials makes it easy to
service if a component ever does require replacement. Some
competing products are potted, and must be replaced if they fail.
But compactness and durability are not all you get in the PVM-
4210. Inherent in the design is exceptional pulse fidelity with virtu-
ally no ringing, over-shoot or under-shoot, and protection against
arcs, shorts and load transients in a reliable, economical module.
DIRECTED
ENERGY
INCORPORATED
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