VDD series

Programmable DC-DC converter with multi function and excellent operability

Programmable DC-DC converter with multi function and excellent operability

VDD series is a high power and variable output DC-DC converter which can be operated on DC.
Because the DC operation, VDD is most suitable for many applications.
For example, it is the best choice for R&D of next-generation energy systems and anti-disaster measure systems, such as Smart house in which electricity is supplied as DC mutually between home rechargeable batteries and EVs, and Voltage adjustment when driving DC electronic equipment by emergency large rechargeable batteries.
Furthermore, you can istall VDD into your system easily, because it is equipped with various digital interface such as LAN (Ethernet*1) and USB. *2

*1 : Ethernet is a registered trademark of Xerox Corp.
*2 : Adaptors will be needed additionally. And, -LGob option will be needed if it will be used under specific condition. Please see page 10 for detail.

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Maximum Power Maximum Voltage
6V to 650V 800W to 6kW
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Standard functions

Key Lock Function

Lock all front panel operation to prevent erroneous operation. (emergency stop by power switch is still valid. )

Lock all the function other than reset lock mode. This mode is good for purpose to avoid mis-operation complelely.

Dual Tracking, Multiple Outputs

Dual tracking control, which enables both positive and negative outputs simultaneously in master slave operation, is possible.
Multi outputs and various versatile operations are also possible by combining above dual tracking control and slave local mode.
Positive and negative output(+V, -V) of dual tracking control and set output voltage of slave local mode can be output simultaneously by turning on the master unit.

Digital interface

Digital control of USB / Ethernet / RS-232C / RS485 / GPIB and one-control on master slave operation.

Master / Slave control

The Master / Slave control function allows you to control up to 32 units connected in parallel from a single unit.

Remote Switch ON / OFF

Remote sensing

Prevents voltage drop down (VO-VL)due to resistance (R) or deterioration of stability by contact resistance.

Remote Control
  • Remote / Local change

    Each of voltage, current or all the modes can be switched by relay or TTL signal.

  • Output control

  • Output Monitor

  • Status Output

    Common is floating in open collector output of common. With stand voltage 30Vdc, sink current 5mA or less.


Various Digital Control Functions

Operation example

VDD series of same model number can be connected in series or parallel to increase output voltage or current.


-LGobOptical Interface Board *1*2

-LGob : OPtical interface board + optical cable 2m
-LGob(Fc5) : OPtical interface board + optical cable 5m
-LGob(Fc10) : OPtical interface board + optical cable 10m
-LGob(Fc20) : OPtical interface board + optical cable 20m
-LGob(Fc40) : OPtical interface board + optical cable 40m

Optical communication offers insulation control. It is to prevent malfunction such as transient phenomenon by surge, lightning induction, and exogenous noise.

-L(400V)Input voltage
-LUs1USB Interface Board *1*2

Enable digital control via USB

USB hub shall be required between VDD and PC when control multiple VDD.

-LEtEthernet Interface Board *1*2

Enable digital control via Ethernet

Hub shall be required between VDD and PC when control multiple VDD.

-L(Mc0.5),-L(Mc0.15) *2Communication cable length change

Change length of CO-M cable to 0.5-meter and 0.15-meter long.(Only either can be selected.)

*1 If you select this option, standard digital interface and master-slave function will not be equipped. Also, please see the CO series catalog for detail of function of digital interface function.
*2 These options cannot be selected together. Only one of each can be selected.

How to OrderWhen ordering, suffix the above option number to the model number.
(alphabetical, input voltage order)

Technical Notes

Connection · Operation

Connection of load

  • Please use a short lead wire that is sufficiently thick for the connection.
  • Please use PVC electric cable (105°C) that can fully tolerate the voltage used. It is necessary to consider current capacity, length limit of output wire by sensing (0.5V /lead) and so on for wiring with load. Please refer to the following diagram to determine the thickness of cable.

Parallel connection of load

Connection of load
Please insert a diode of which rating is bigger than output voltage and current of power supply to protect the power supply from kick back of load.

Definition of specifications

Specifications in this catalog, except otherwise specified, refer to values when maximum rating output (full scale*) after 2-hour warm up.

Applicable scope of specifications
"F.S × catalog value(*)" is applied for ripple, stability, regulations and temperature coefficient, and "value if F.S × ±1%(*)" is applied for high-voltage output linearity, monitor linearity and display linearity, both in the range of 10% to 100% of maximum rating output.

Indication is in rms that includes high-frequency noise.

Preset value does not show the actual output status accurately. If you need an accurate setting, conduct actual output without load and set a voltage. Also for setting current, conduct output after shorting the output terminal and gradually raise current before setting at a desired value.

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