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knestronX HPDC · Topologies

The right topology for your application

The requirements of your application determine which degrees of freedom your power electronics must offer, from voltage adaptation to bidirectional energy flow. Whether battery test system, smart grid, electrolysis or megawatt charging, the requirements for modern  high-power electronics differ considerably.

Request a quote To the HPDC platform

What matters is not only the power, but above all:

Does energy need to flow bidirectionally?

Is galvanic isolation required?

Is a buck converter sufficient?

Does the voltage need to be stepped up and down flexibly?

Are series or parallel connections required?

Technical decision process

Three steps to the right topology

The knestronX Rack allows different topologies to be selected and combined, matched to the degrees of freedom of your application.

1

Step 1

2Q or 4Q?

2-quadrant

Bidirectional current
Voltage in one range only

Ua < Ue

4-quadrant

Current and voltage fully controllable
Step-up and step-down possible

Ua ≤ ≥ Ue

Suitable for

Battery test systems Battery simulation Simulation of electric drive components Fuel cell test systems Energy conversion Charging/discharging processes Megawatt Charging (MCS) Electrolysis systems Short-circuit test systems Smart grids
2

Step 2

Galvanic isolation required?

Galvanic isolation is required when:

different ground potentials are present safety requirements increase outputs must be connected in series sensitive test environments are operated

With galvanic isolation

BRW is required.
Input voltage above 800 VDC: Balancer required
Input voltage below 800 VDC: no Balancer

Without galvanic isolation

Direct TSB/H-bridge solution possible

3

Step 3

Which voltage range is required?

Input voltage range

Up to 800 VDC

Standard version no Balancer required compact design high currents possible reduced complexity

800–1500 VDC

Balancer required higher power density lower currents additional degrees of freedom

Output voltage range

Up to 800 VDC

Parallel connection of outputs possible higher currents possible

800–1500 VDC

series connection of outputs and BRW required full power range

We support you in the decision process. You know your application, we define the right topology.

Request a quote

Topologies at a glance

Five topologies from one modular kit

All topologies are built from the same building blocks in the knestronX Rack. Which blocks are added depends on isolation and voltage range.

Modular kit of the knestronX Rack

Ue DC input
Balancer optional, input > 800 VDC
BRW (Bidirectional resonant converter) optional, galvanic isolation
2L - TSB Buck converter
or
H2L bridge Step-up and step-down
Ua DC output
optional block
Converter stage, always included

2L - TSB

High currents and robust DC/DC applications

Voltage behavior: Ua < Ue (buck converter)
Isolation: no
Quadrants: 2Q

Umax = 800 V / Imax = 700 A

H2L bridge

Simulation and dynamic test systems

Voltage behavior: Ua ≤ ≥ Ue (step-up and step-down)
Isolation: optional
Quadrants: 4Q

Umax = 800 V / Imax = 350 A

BRW + 2L - TSB

Battery test systems & smart grids

Voltage behavior: parallel Ua < Ue | series Ua < 2 × Ue
Isolation: yes
Quadrants: 4Q

parallel: Umax = 800 V / Imax = 700 A
series: Umax = 1500 V / Imax = 350 A

Balancer + BRW + 2L - TSB

MCS, electrolysis & high-voltage systems

Voltage behavior: parallel Ua < ½ × Ue | series Ua < Ue
Isolation: yes
Quadrants: 4Q

parallel: Umax = 750 V / Imax = 700 A
series: Umax = 1500 V / Imax = 350 A

Balancer + BRW + H2L bridge

Battery simulation and fuel cell test systems

Voltage behavior: Ua ≤ ≥ Ue
Isolation: yes
Quadrants: 4Q

Umax = 750 V / Imax = 350 A

Click the circuit diagram to view it in full size.

Contact

Rethinking power electronics?

Tell us your application, power, and voltage range. We will propose the right platform and configuration.

KNESTEL
Technologie & Elektronik GmbH

Email

vertrieb@knestel.de

Phone

08372- 7080

Address

Osterwalder Str. 12
87496 Hopferbach

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BRW + 2L - TSB

  • Typical Applications: Battery Test Systems & Smart Grids
  • Voltage behavior:
    parallel Ua< Ue | series Ua < 2 × Ue
  • Isolation: yes
  • Quadrants: 4Q
  • parallel: Umax = 800 V / Imax = 700A
  • series: Umax = 1500 V / Imax = 350A
More details

Balancer + BRW + 2L - TSB

  • Typical Applications: MCS, Electrolysis, and High-Voltage Systems
  • Voltage behavior:
    parallel Ua < ½ x Ue | series Ua < Ue
  • Isolation: yes
  • Quadrants: 4Q
  • parallel: Umax = 750 V / Imax = 700A
  • series: Umax = 1500 V / Imax = 350A
More details

Balancer + BRW + HTSB

  • Typical Applications: Electrolysis and Megawatt Charging
  • Voltage behavior: Ua < 2 × Ue
  • Isolation: yes
  • Quadrants: 4Q
  • Umax = 1500V / Imax = 350A
More details

Balancer + BRW + H2L bridge

  • Typical Applications: Battery Simulation and Fuel Cell Test Systems
  • Voltage behavior: Ua ≤ ≥ Ue
  • Isolation: yes
  • Quadrants: 4Q
  • Umax = 750 V / Imax = 350A
More details

2L - TSB

  • Typical Applications: High-current and rugged DC/DC applications
  • Voltage behavior: Ua < Ue (buck converter)
  • Isolation: no
  • Quadrants: 2Q
  • Umax = 800 V / Imax = 700A
More details

HTSB

  • Typical Application: Higher Voltages and Power Densities
  • Voltage behavior: Ua < Ue (buck converter)
  • Isolation: no
  • Quadrants: 4Q
  • Umax = 1500V / Imax = 350A
More details

H2L bridge

  • Typical Applications: Simulation and Dynamic Test Systems
  • Voltage behavior: Ua ≤ ≥ Ue (step-up and step-down)
  • Isolation: optional
  • Quadrants: 4Q
  • Umax = 800 V / Imax = 350A
More details