Production

Current power supply

Current power supplies developed, manufactured and tested in EVPÚ are static power converters intended to ensure accurate and time-stable power supply, in static or dynamic mode of operation.

The design of converters for static mode of operation is based on static power converters with partially digital control system.

Output parameters are regulated using active semiconductor devices under switching mode operation. Power supplies are suitable for stable powering of magnetic circuits in particle accelerators. Output parameters are adjustable using the keyboard or through the appropriate serial communication interface (usually RS485). Resolution of reference values can be 14 or 16 bits. These current sources can also be used to power superconducting magnets, while also providing unique protection for identification loss of superconductivity of the load magnet ensuring its safe demagnetization and magnet disconnection. Output current can be a reversed by mechanical or motor reverser. Converters are designed with the stability of output current lower than 100 ppm, depending on various failure factors (change in ambient temperature, cooling liquid temperature change, step change of input voltage, etc.).

Special group of current supplies for dynamic mode operation are pulsating output supplies that are designed to power synchrotron magnets. These converters provide a regular repetition of the current pulse with a precisely shaped rising and falling edge and high dynamic accuracy.

Energy taken from the magnetic circuit during the demagnetization is recovered. This feature ensures that the main network only covers operating losses in the converter and the load chain. Nowaday in EVPU, two platform of current supplies with energy recovery opportunity are being developed.

The first platform is more efficient at lower output voltage levels, and the energy during magnet demagnetization is stored in the appropriate inverter circuits designed for this purpose, only the losses in the converter chain and the load are covered from the power supply network. The second platform is more efficient at higher output voltage levels, and energy during magnet demagnetization is recovered to the power grid. Both platforms are designed as modular systems from a mechanical point of view, making them easily adaptable to the requirements of individual medical applications or experimental physics.

Current supplies from production of EVPÚ can operate in the range from 30 A to 2 500 A, power range from 400 W to 400 kW. Power supplies for the superconducting magnets are in the output current range from 100 A to 15 000 A, with power from 1 kW to 400 kW.

Each design is individually realized and the technical parameters of each power supply are discussed with clients at all stages of the development.

PS15000-25D

The developed dynamic-mode, current source power supply prototype, with recuperation ability to the DC-link.

Maximal output power: 375kW
Maximal output current: 15 000A
Maximal output voltage: 25V
Load inductance: 0,1uH to 1mH
Output current thermal coefficient: 100ppm
Output current stability: 50 ÷200ppm
Dynamic mode di/dt (Lm =0,5mH): 40kA/s
Total dynamic output current accuracy: ±0.1% of Imax
Remote control: RS485 (Profibus)

PS 1200-160

Maximal output power: 192kW
Maximal output current: 1200A
Maximal output voltage: 160V
Load inductance: 1,1mH
Output current thermal coefficient: 20ppm
Output current stability (8h): 100ppm
Output current stability at transient states: 100ppm
Current measurement resolution: 16 bit
Remote control: RS485 (Profibus)

PS 500-30MR

Maximal output power: 15kW
Maximal output current: 500A
Maximal output voltage: 30V
Load inductance: 1mH to 99mH
Output current thermal coefficient: 20ppm
Output current stability (8h): 100ppm
Output current stability at transient states: 100ppm
Current measurement resolution: 16 bit
Remote control: RS485 (Profibus)

PS 15-30

Maximal output power: 450W
Maximal output current: 15A
Maximal output voltage: 30V
Load inductance: 1mH to 99mH
Output current thermal coefficient: 50ppm
Output current stability (8h): 100ppm
Output current stability at transient states: 5mA
Current measurement resolution: 16 bit
Remote control: RS485 (Profibus)

PS 140-8

Maximal output power: 1120W
Maximal output current: 140A
Maximal output voltage: 8V
Load inductance: 1mH to 99mH
Output current thermal coefficient: 100ppm
Output current stability (8h): 250ppm
Output current stability at transient states: 50 to 200 ppm
Current measurement resolution: 18 bit
Remote control: RS485 (Profibus)

PS 25-120M

Maximal output power: 3kW
Maximal output current: 25A
Maximal output voltage: 120V
Load inductance: 1mH to 99mH
Output current thermal coefficient: 50ppm
Output current stability (8h): 100ppm
Output current stability at transient states: 10mA
Current measurement resolution:16 bit
Remote control: RS485 (Profibus)

PS 260-70D

Maximal output power: 18kW
Maximal output current: 260A
Maximal output voltage: 70V
Load inductance: 10mH
Output current thermal coefficient: 100ppm
Output current stability (8h): 250ppm
Total dynamic output current accuracy: ±0.2% of Imax
Dynamic mode di/dt: 1,5kA/s
Remote control: RS485 (Profibus)

Other types of current power supplies

PS600-80D

Maximal output power: 48kW
Maximal output current: 600A
Maximal output voltage: 80V
Load inductance: 0,1uH to 40mH
Output current thermal coefficient : 100ppm
Output current stability: 50 ÷100ppm
Dynamic mode di/dt (Lm =0,5mH): 600A/s
Total dynamic output current accuracy: ±0.1% of Imax
Remote control: RS485 (Profibus)

PS 1000-360M

Maximal output power: 360kW
Maximal output current: 1000A
Maximal output voltage: 360V
Load inductance: 6H
Output current thermal coefficient : 20ppm
Output current stability (8h): 100ppm
Output current stability at transient states: 100ppm
Current measurement resolution: 20 bit
Remote control: RS485 (Profibus)

PS 500-120MR

Maximal output power: 60kW
Maximal output current: 500A
Maximal output voltage: 120V
Load inductance: 1,25H
Output current thermal coefficient : 20ppm
Output current stability (8h): 100ppm
Output current stability at transient states: 100ppm
Current measurement resolution: 20 bit
Remote control: RS485 (Profibus)
EVPÚ a. s. produces wide range of current power supplies developed and manufactured to fit customer’s needs. Contact us for more information or to get a quote.

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