HV Short Pulse Transformer | The Quantum Group

The Quantum Group Sweden

Black Water

Short Pulse Transformer

Features:

Very compact, due to proprietary OptiDesign optimization algorithms;
Cost effective

Specifications (Example):

Primary voltage: 12 x 1.2kV;
Secondary voltage: 50kV;
Pulse power: 5MW;
Pulse length: 10μs;
Rise time (10..99%): < 3μs;
Pulse Rep. Rate: 100 Hz;
Polarity: Inverting;
2nd HV winding for filament heater;

Click on image to reveal more details on the Image Gallery below for our Design, Construction and Testing of the Short Pulse Transformer

Design

Construction

Testing

Electrostatics: Peak electrostatic field around 9 kV/mm at anti-corona rings (5 mm diameter).

Transformer has outer dimensions 12.6x16.7x35.3 cm Parameter table: V2 = 50 kV I2 = 100 A Pulse rise time = 2 µs Pulse length = 10 µs PRR = 50 Hz S (number of subcores) = 6 Secondary windings: 2, connected in parallel Primary windings: 12, each connected to independent power supply N2 (turns per secondary winding) = 160 N1 (turns per primary winding) = 23

Electrostatic field distribution

Magnetostatics, short circuit: Leakage inductance verified to be within 20% of estimated value.

Magnetostatics, open circuit: Magnetic peak flux density ~1.2 T in straight sections

Plot of the output pulse voltage including a zoom of the time the pulse reaches 99% of its peak value. 0-99% rise time is then 2.1 µs¨, within 5% of the value from the equations (2.0 µs)

Short pulse transformer 3D model

Prototype of Short Pulse Transformer.
This special transformer is integrated with sub-systems of High Voltage pulsed power generators (modulators). It can supply different types of loads like Radio Frequency amplifiers (magnetrons, klystrons), electrostatic plates for pulsed electric field generators, etc. for the following applications:
- Scientific applications (e.g. particle accelerators)
- Medical applications: Radiotherapy machines
- Industrial and military applications (e.g. radars, cargo X-ray scanners, sterilization machinery, food processing, water treatment, etc.)

Testing

Oscilloscope test data captured; 45 kV, 10 microsecond flat top, 2.6 microsecond rise time
(Pink trace: HV pulse)

Oscilloscope test data captured; 45 kV, 100 Hz repetition rate
(Pink trace: HV pulse, Blue trace: primary winding voltage, Green trace: primary winding current)

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