High voltage power supplies

In 2010 SIGMAPHI decided to start its “pulsed power supplies” activity by signing a technology transfer agreement with Synchrotron Soleil and by employing a High Voltage specialist.

In 2013 SIGMAPHI took over the “Power Electronics” department of Bruker Biospin.

In 2016, Sigmaphi also developed its team by employing a new specialist with great experience in fast switches, a doctor in electronics.

Our High Voltage power supplies are mainly used to power IOT and Klystrons for particle accelerator applications. Our compact design is based on switching or transistor technology solutions (IGBT/MOS).

A stability of up to 99.9%, thanks to minimal variations, ensures reliable and constant operation in pulsed or direct current mode. Optional Solid State Crowbars are available.

Examples with performances

Klystron modulator – IPN (Orsay, France)

We developed and manufactured in 2015 in partnership with Diversified Technologies (DTI) a klystron modulator for IPN Orsay.

High voltage 115kV, 50 A current pulse, 5.7 MW peak
Ripple less than 0.2% on a flat top.
Pulse frequency set between 1.6ms /50Hz and 3.5ms/14Hz.

Power supplies for electrostatic deflector – Protontherapy

20 high voltage 5kV 500mA electrostatic deflector power supplies

Optical switch power supply (Pockels cell)

Power function for two simultaneous (consecutive) roles:
• Stabilization of a pulsed voltage: load adaptation of a PFN
– Resistance to a voltage front > 2kV/ns without unintentional triggering (“mis-firing”)

– Voltage limiter matrix: stabilization at 18kV (+/- 1%) under # 800A in less than 300ns

• Crowbar function; end of HT pulse
– IGBT Matrix: Short-circuit current # 2kA with one front > 20kA/µs
– Permissible (Appropriate) reverse current; > 1kA

• Controlling function :

– Triggering of the PFN : controlled release of the PFN (fault management)

– Control of the Crowbar by two independent circuits (safe redundancy): control of the physical presence of the two channels (circuits);

adjustable trip +/- 30ns ; jitter < +/- 1ns, delay in case of absence of a circuit < 10ns