• DOKF series | Bipolar power supply (Low Voltage Amplifiers) | Matsusada Precision
  • DOKF series | Bipolar power supply (Low Voltage Amplifiers) | Matsusada Precision

High Speed Response Bipolar Power Supply with function generator

  • Voltage range: ±20V to ±80V
  • Current: ±5A to ±20A
  • Power: 400W
  • Ultimate in accurate programable operation

Four-quadrant bipolar power supplies are developed up to the following.

DOKF series are four-quadrant power supplies possible to source and sink current. It can be applied widely according to usage, from transient response tests to various evaluation tests. They realize a high-speed response of DC to 120 kHz (at constant voltage mode). The embedded function generator can generate basic waveforms, including sine waves, rectangular waves, and customized waves. That realizes a high-speed response of DC to 120 kHz (at constant voltage mode). The embedded function generator can generate basic waveforms, including sine waves, rectangular waves, and customized waves. And as it also provides the high-resolution sequence function as standard, you can program output patterns in detail. Moreover, as This bipolar power supply can make their generation of wave and set sequence all with the simplified operation on the front panel, you can easily use various functions.

Note: We have not designed this product to be charge and discharge batteries.
For battery charging and discharging applications, please refer to the Battery Cycle Tester product page.

Main features

  • Superior visibility and operability by using color liquid crystal display.
  • High speed of DC to 120 kHz is realized.
  • Four-quadrant behavior able to source and sink current.
  • It is possible to generate non-distortional wave such as sine wave, rectangular wave.
  • It is possible to set and operate high performance sequence in 1024 steps.
  • There are 2 modes of DC and AC + DC and each of them can be set individually.
  • 2 modes operation of CV (constant voltage) and CV (constant current) are applicable.
  • It is possible to connect maximum 3 power supplies in parallel (synchronized trigger) by coinciding accuracy of frequency (synchronized clock) in synchronized operation.
  • GPIB, USB and RS-232C interface are equipped as standard.
  • It is possible to output voltage/current in 16 bits and customized waves of resolution of 1024 in one cycle. (optional control software)

Operation range

Output range

Applications

  • To drive capacitive loads such as capacitor.
  • To drive inducible loads such as coils and transformers.
  • Tests of various motors.
  • Evaluation of solar cell panel related equipments such as power conditioners.
  • Voltage fluctuation tests for automotive electrical components, etc.

Models

Please consult with us for specifications other than the below.

Model Output Frequency Bandwidth (-3 dB)
Voltage Current Power CV mode CC mode
DOKF20-20 ±20 V ±20 A 400 W DC to 120 kHz DC to 60 kHz
DOKF40-10 ±40 V ±10 A
DOKF60-6.7 * ±60 V ±6.7 A DC to 50 kHz
DOKF80-5 * ±80 V ±5 A

* They are available in the near future. Please contact our sales staff for detail.

Functions

Basic Wave Generation Function

DOKF is equipped with a built-in function generator that produces basic waveforms, including sine, rectangular, and triangle waves. You can set the frequency range between 0.01 Hz and 120 kHz. Easy adjustments/edition of amplitude, initial phase (for sine wave), phase shift (for sine wave), and duty ratio (for rectangular/triangle wave) are possible. DOKF has special features of "soft start" and "soft stop," which enable the output's initial program rise and fall characteristics.

Starting phase Starting phase
Soft start Soft start

AC Volt/current sweep, frequency sweep

Soft stop Soft stop

DC Volt/current ramp

Applications

Power activation test, various start-up tests of motor, fluctuation test of wave shape, etc.

Sequence functions

DOKF is equipped with a sequence function that can program parameters such as step length, step amplitude ramp, DC voltage, and current ramping, AC voltage and current ramping, frequency sweep, AC superposition, step jump, and jump times. These useful functions help program the desired waves in a very flexible manner, resulting in efficient laboratory and research works.

Complex sequence can be created easily with teh intelligible display.
Sequence functions 1
Sequence functions 2
  • Step setting length 0.1 ms to 1000 h (resolution of 0.1 ms)
  • Maximum 1024 steps per program.
  • Maximum 64 programs can be stored in memory for each CC/CV operation
  • Program repeat can be set by “endless repeat” or “1 time to 10000 times”
  • Multiple programs can be converted to activate
Image of Program
Image of Program

Sequence functions help to create complicated waves like below to be simply and easily edited.

Pulse current variation Pulse current variation
Ripple current superpose Ripple current superpose
AC voltage variation AC voltage variation
DC voltage cutoff DC voltage cutoff

Applications

Test for motors, pulse power supply and various evaluation.

Measurement functions

DOKF is equipped with measurement function that can measure DC value, AC RMS value, and Max/Min value, likewise, it is possible to automatically measure wide range bandwidth from DC to 120 kHz. There are 4 parameters which are simultaneously displayable, each of these parameters are individually programmable. As this measurement is standard feature, no option needs to be purchased. This sophisticated feature will reduce time for editing output waves and bring up work efficiency.

Measurement functions 1
Measurement functions 2

Synchronized Operation

The following DOKF operations are available for up to three units.

Synchronous Trigger

Through a single operation of the master unit, it is possible to match the output timing of ON/OFF in one or two slave units. In turning the output on, the output starting gap between the master and the slave is less than 0.5 μs

*To use this function, please purchase "Dedicated cable for synchronous trigger" of 2 meters separately.

Synchronous Clock

By providing the clock input of 10 MHz, the individual difference between the oscillators installed on each unit is removed (In the case of this, there are a few ppm up to several tens ppm in general). What is more, frequency accuracy and sequence-step time are completely unified through the operation.

Moreover, the product is also available for setting the phase shift difference for sine wave toward each unit.
(*Please prepare the coaxial cable on both ends of BNC connectors which is not included but required for synchronous clock.)

*When the slave unit is required to synchronize in accordance with the waveform set by the master unit, -LMs option must be taken (in master/slave control).
Note that the time synchronized operation is not available if using the master/slave control.

Synchronized Operation
Ex.) Setting of phase difference of 90 degrees at sine wave output
Other functions:
Protection Function (Cut-off, Individually Settable Limiter Protection), Key Lock Function and Switching CV/CC, Memory Function, these are installed as standard.

Operability

Operability
  1. Display: Display various settings and measurements.
  2. OUTPUT switch: ON/OFF for output
  3. Rotary encoder: Change value
  4. POWER switch: ON/OFF for main power
  5. CANCEL switch: Cancel settings
  6. ENTER switch: To confirm and key in
  7. CV/CC switch: Switchover CV/CC mode
  8. Memory switch: Switchover memory screen
  9. Setting/Storage switch: Make to setting change menu, store memory
  10. Protection switch: To switch protection setting menu
  11. Shift up switch: Shift up each setting items
  12. Shift down switch: Shift down each setting items
  13. Sequence switch: Use for switchover of sequence screen or interrupt or restart of sequence operation
  14. Shifting left switch: Shift digits of settings to left
  15. Shifting right/LOCK switch: Shift digits of settings to right and also use key lock function

Specifications

For details, download the datasheet below.

Options

-LCk: CC-Link Interface Board
It enables digital remote control via net work of CC-Link.
-LMsm, -LMss: Master-slave Control (parallel operation)
Maximum 3 units, including master unit, are hooked.

("-LMsm" for the master unit and "-LMss" for slave units. Please order the required number of units. Every master unit and slave unit is exclusive use. If you want to change the master-slave combination, it will need to be readjusted at our factory.) (If you take this option, the synchronized operation is unavailable.)

-LRa: The front panel bracket to mount for the 19-inch rack of EIA and JIS.
The front panel bracket becomes the panel attachable to the 19-inch rack of EIA and JIS standards.

(It is impossible to support the main unit only with these brackets. Please always utilize a sole plate or angle bars to support the unit weight.)

Accessories

AC input cable

[Standard] CABLE TYPE8 CABLE series | AC input cable | Matsusada Precision CABLE series | AC input cable | Matsusada Precision 125 V / 125 A 2.5 meters

Fixed length

[Sold separately] CABLE TYPE3 CABLE series | AC input cable | Matsusada Precision CABLE series | AC input cable | Matsusada Precision 250 V / 10 A 2.5 meters

Fixed length

[Sold separately] CABLE TYPE4 CABLE series | AC input cable | Matsusada Precision CABLE series | AC input cable | Matsusada Precision 250 V / 10 A 2.5 meters

Fixed length

Please use appropriate AC cable.

Dimensions

For details, download the datasheet below.

Tech Notes

Characteristics of amplifier

Rise time

(step time) : responsiveness may be expressed with rise time.(see right figure)
Rise time for amplifiers in fc (Hz) of response time (= frequency band) is calculated with following equation generally.
"tr ≒ 0.35/fc"
Decay time tf is equal to tr.
Frequency bandwidth
: to 120 kHz, tr = tf ≒ 2.9 μs
: to 60 kHz, tr = tf ≒ 5.8 μs

Rise time

Response speed

When accurate output wave is required, please select an amplifier in sufficiently higher frequency band than applied one. Generally, speedy frequency band as 3times to 5 times of applied frequency for sine wave and 10 times for rectangular wave are required. If frequency band is in lacking, as not only output oscillation is reduced but also phase difference of input and output become larger, consideration to apply it monitoring output wave is required.

Response speed

For Capacitive Loads

In the case of capacitive load, oscillation may be caused. If so, please insert a power resistance to the output in series.
And, in capacitive load, please attend that the frequency band is limited by the resistance and capacity inserted in series.

For Inductive Loads

At CC mode, oscillation may be caused by inductance of inductive loads.
If so, please connect C-R straight circuit between output terminals so as not to cause oscillation.

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