The PT family of Pulsed Power Thyristors (PPTs) are based on Dynex’s GTO
technology and are designed for long term stability under D.C. voltages
and have structures that are resistant to cosmic ray induced failures at
normal working voltages.
Dynex’s Pulsed Power thyristors may be
used to connect a source of stored energy, such as a capacitor to a
load, or to bypass and protect the load in the case of a crowbar
circuit. In these pulsed power applications where the rate of rise of
current is very fast, the pulse power switch is acting as a closing
switch and ordinary phase control thyristors (SCRS) are likely to fail
due to the high di/dt experienced.
Pulsed Power Thyristors may
also be required to act in the opening switch mode as well. Such
applications may include those where voltage is reapplied to the pulse
power switch shortly after closing and the switch needs to have
recovered blocking capability or the transferred energy needs to be
controlled. In these applications, the switch needs to have turn-off
capability to reduce the natural turn-off time (tq) of the device. The
device is operated in GTO mode with the appropriate commutating gate
drive.
Pulsed Power Thyristors (SCR) - Disc / Puk Devices
| Part Number |
VDRM (V) |
VRRM (V) |
IT(AV) @ Tc=80°C (A) |
ITSM @ Tc=125°C |
dI/dt to ipk (kA/µs) (kA) |
dV/dt (V/µs) |
Rth(j-c) (°C/W) |
Outline Type Code |
Flange OD / Contact OD / Height (mm) | |
|---|---|---|---|---|---|---|---|---|---|---|
| PT40QPx45 | 4500 | 16 | 760 | 13 | 5 | 20 | 200 | 0.033 | P | 56 / 38 / 37 |
| PT60QHx45 | 4500 | 16 | 1000 | 22.5 | 10 | 40 | 175 | 0.013 | H | 100 / 63 / 26.5 |
| PT85QWx45 | 4500 | 16 | 1670 | 37 | 22 | 90 | 200 | 0.01 | W | 120 / 84.6 / 27.7 |
| ACR300SG33 | 3300 | 20 | 493 | 6500 | 2 | 0.125 | 3000 | 0.042 | G | 58.5 / 34 / 27 |
|
Dynex has been supplying thyristors used as crowbars to protect
other high power circuitry in railway propulsion units and the like
for many tens of years. In addition Dynex has been a supplier of
devices used in equipment for the sterilization of foods by intense
light or x-rays since the late 1980s. These applications operate at
moderate di/dts and can be satisfied with conventional thyristor
solutions. In the field of ignitron replacements and weld switches, Dynex has been a world leader in the application of solid state devices. Dynex has been involved in the design and manufacture of assemblies for the emergent pulse power communities on the West Coast of America and at CERN, Switzerland. An example of a pulsed power assembly is shown right. It uses five Dynex PT40QPx45 4.5kV SCR devices and was designed in-house by our power electronics design team and features optical triggering and feedback plus breakover diode protection of individual thyristors. |  |
For more information on how Dynex can help with your pulsed power needs, please e-mail us power_solutions@dynexsemi.com
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