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Increased power without compromising either specifications or lifespan is what the SM15K units offer - a breakthrough in power electronics technology has enabled them to engineer features that customers demanded but were previously impossible while maintaining very competitive prices.

With the new SM70-CP-450, SM500-CP-90, SM210-CP-150, and SM1500-CP-30 Delta Electronika have extended their offering to a higher power level: from 6kW maximum per supply to 15kW.


Several new features are introduced in the SM15K series compared to our current power supply series. One is already implied in the unit name: CP is short for Constant Power! The constant power characteristic is not new, but along with a bi-directional power flow it is! Here are the most striking features.

Flex output for better value

The constant output power covers the output range of five separate power supplies with a traditional rectangular VI-curve. For example:



70 Volts @ +214 Amps              70 Volts @ -214 Amps
60 Volts @ +250 Amps              60 Volts @ -250 Amps
50 Volts @ +300 Amps              50 Volts @ -300 Amps
40 Volts @ +375 Amps              40 Volts @ -375 Amps
33 Volts @ +450 Amps              33 Volts @ -450 Amps


210 Volts @ +71 Amps             210 Volts @ -71 Amps
200 Volts @ +75 Amps             200 Volts @ -75 Amps
150 Volts @ +100 Amps           150 Volts @ -100 Amps
125 Volts @ +120 Amps           125 Volts @ -120 Amps
100 Volts @ +150 Amps           100 Volts @ -150 Amps


500 Volts @ +30 Amps             500 Volts @ -30 Amps
375 Volts @ +40 Amps             375 Volts @ -40 Amps
300 Volts @ +50 Amps             300 Volts @ -50 Amps
250 Volts @ +60 Amps             250 Volts @ -60 Amps
167 Volts @ +90 Amps             167 Volts @ -90 Amps       


1500 Volts @ +10 Amps             1500 Volts @ -10 Amps
1000 Volts @ +15 Amps             1000 Volts @ -15 Amps
750 Volts @ +20 Amps               750 Volts @ -20 Amps
600 Volts @ +25 Amps               600 Volts @ -25 Amps
500 Volts @ +30 Amps               500 Volts @ -30 Amps

Choosing the best output range is much easier now and offers users far better value for money.


Bi-directional power flow

Bi-directional power means the same constant power characteristic in the second quadrant for the full 15 kW. It operates like an electronic load too: previously Delta’s power supplies would be equipped with an optional power sink capable of absorbing up to 10% of the total energy which was dissipated via internal heat sinks.

Now, the power sink is standard and can sink up to 100% of the power without the need for dissipating lots of energy.


Power Recovery [Regeneration] Technology

With the new Power Recovery [Regeneration] Technology Delta returns full power back into the grid and the efficiency of 95% avoids the need for expensive water cooling. Compared to traditional electronic loads – where dissipation is 100% – there is a power loss of just 5%.

Rooms will be cooler, costs for air conditioning systems will drop significantly and overall, the SM15K units contribute to a smaller carbon footprint.


Extremely good dynamic response to load changes

Fast response to load changes has been a challenge for a long time, especially when it comes to changing from positive to negative current and vice versa. Previously, for applications requiring source and sink devices, several solutions were offered such as pre-loads. The full integration of source and sink in one device is a neater and more efficient solution. The output voltage of a SM500-CP-90 recovers in 200µs after a load change from +90 to -90A and -90 to +90A.


Inclusive functionality

Besides the constant power output and the bi-directional power flow a lot of other features are included in the standard versions of the SM15K series. For instance:

  • Ethernet interface
  • Built-in sequencer
  • Simulation software: Leadless sensing, Internal resistance and PhotoVoltaic simulation
  • Digital control to adapt regulation to match load type
  • Fine tune settings

And many more.


Optional interfaces

The standard interface for the SM15K units is the Ethernet interface (16 bit) with built in sequencer. Optional plug and play interfaces are: 


  • Master/Slave interface series and parallel operation
  • Isolated analog programming interface
  • Serial interface with multi protocols: RS232, RS485, RS422, USB (device)
  • Digital I/O interface
  • Interface with isolated contacts


Data sheet

Visit our website to download the datasheet and get more information about the SM15K series.