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Bidirectional Power Supplies (Regenerative Power Supplies) PBRM series

  • PBRM series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision
  • PBRM series
  • PBRM series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision
  • PBRM series

REGENERATIVE DC POWER SUPPLY

High Power up to 150kW in one rack

  • Voltage:
    80 to 1500Vdc
  • Current:
    60 to 3600A
  • Power:
    30 to 150kW
  • High power

Space-saving 19-inch rack with a width of 19.3 inches

The PBRM series, the high-power regenerative (bidirectional) DC power supply, is available in parallel operation of up to 150 kW with ten units in a 19-inch, 3U rack. It can be used as a single high-power DC power supply and is also designed as a regenerative DC electronic load.
The combination of both functions allows optimal evaluation of high-power inverters, automotive batteries, and bidirectional DC-DC converters without switching connections. As the inside of the cabinet is pre-wired, you can save the time required for setup. Additionally, the cabinet is equipped with casters so it can be moved easily.

The base model PBR series can be found here.

What is a bidirectional power supply ?

A bidirectional power supply (regenerative DC power supply) is a power supply that functions as both a DC power supply and a DC electronic load in a single unit and regenerates power to the AC power source side during the electronic load operation. It is also known as a regenerative power supply, regenerative electronic load, or bidirectional power supply. The power supply is available in various applications, including evaluating inverters, DC-DC converters, motors, and other tests without switching connections.

Introducing the PBR/PBRM series video Introducing the PBR series video | PBRM series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

We recognize the importance of renewable energy for sustainable development, diversification of energy supply, and preservation of the environment, considering rapidly changing international situations. To address critical issues such as the energy crisis and climate change, carbon neutral and carbon offset initiatives to reduce greenhouse gas emissions are underway. The use of renewable energy sources such as solar power, wind power, and green hydrogen is also promoted. The development and spread of environmentally friendly technologies such as electrified electric vehicles with the power train system, household storage batteries, and fuel cells have been accelerated.
In response to the social conditions, the PBR/PBRM series of regenerative DC power supplies regenerates power to use energy effectively, contributing to developing and evaluating inverters, converters, and other devices.

FEATURES

  • 1. SPACE-SAVING DESIGN FOR WORKPLACE

    Introducing the extremely compact PBR/PBRM makes more effective use of your workspace. We have developed the smaller regeneration DC power supply for space saving aimed at installing other measuring tools, which makes effective use of the space at the workplace.

    Previous Product for workplace | PBRM series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision
    PBRM series, a high power bidirectional DC power supply comes with PBR series models in one rack.
  • 2. COMPACT SOLUTION
    State-of-the-art semiconductor
    In order to minimize the heat generation itself inside the power supply, we adopted the latest device including semiconductor elements of high efficiency via thorough examination. This enables the product to provide such as a sufficient cooling function to maximize high performance.
    Air-through circuit block technology
    With the improvement of the air-through circuit block, the product has been made smaller, and we also have put more focus on the improvement of block arrangement contributing to excellent space efficiency by extremely reducing the dead space. Consequently, we achieved the significant development of high-density mounting technology. So far, extra spaces inside the device have been required to release the heat. We successfully made the product even smaller to ensure the total amount of height of a mere 5.24 inches 133 mm.
    Air-through Circuit Block Technology  | PBRM series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision
  • 3. EXTENSIVE MODELS FOR VARIOUS APPLICATIONS

    PBR/PBRM series offers a wide range of DC power supply Models, 5 kW to 150 kW, exceeding 60 models.
    The series allows you to find the best-fit model for your applications.

    Extensive lineup for various applications | PBRM series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

APPLICATIONS

In accordance with the strategy, the development of innovative energy sources along with new battery research and development that do not emit CO2 is further accelerated. It will coincide with the shift from vehicles having internal combustion engines to Hybrid Electric Vehicles (HEV), Plug-in Hybrid Electric Vehicles (PHEV), Electric Vehicles (EV), and Fuel Cell Vehicles (FCV). And, motorcycles are also converted to EV bikes. That is, the PBR/PBRM series, a regenerative power supply of its compact and high-power solutions, can support various development, evaluation, and shipment inspection applications. Please try it!

 Bidirectional DC-DC converter evaluation

Using two PBRs, users do not have to worry about troublesome operations like wiring change and other setups which were the norm for conventional power supply and electronic load combinations. The power consumption can be reduced by using one unit in power running mode and the other unit in regeneration mode.

Bidirectional DC-DC converter evaluation | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

 High Voltage Battery charge/discharge testing

A single unit can perform charge and discharge operations. The combination of a conventional power supply and an electronic load reduces setup time, and dedicated software (PBR-BT) is available, which contributes to the effective use of software development time. The PBR/PBRM can perform charge/discharge cycle tests on high-voltage batteries up to 1500V.

Battery charge/discharge testing | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

 Traction inverter/Motor evaluation

A single unit can sink counter electromotive current from motors and inverters. The application needs a regenerative DC power supply that has the function of power running and regeneration as a battery-simulating power supply.

Inverter/motor evaluation | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

 Power inverter evaluation for battery system

Power inverter evaluation is available using a regenerative DC power supply for the battery simulation. MBS: the battery simulation function and -LAsoc option: SOC makes it easy to perform the evaluation.

Power inverter evaluation for storage battery | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

 Other

Models

Model Power running, Regeneration at Maximum Power supplies installed
(units)
Ripple (Power running)
Voltage [Vdc] Current [A] Power [kW] Voltage [mVrms] Current [Arms]
PBRM80V720A30kW 80 V 720 A 30 kW 2 units 25 mVrms 240 Arms
PBRM80V1080A45kW 1080 A 45 kW 3 units 540 Arms
PBRM80V1440A60kW 1440 A 60 kW 4 units 840 Arms
PBRM80V1800A75kW 1800 A 75 kW 5 units 1140 Arms
PBRM80V2160A90kW 2160 A 90 kW 6 units 1440 Arms
PBRM80V2520A105kW 2520 A 105 kW 7 units 1740 Arms
PBRM80V2880A120kW 2880 A 120 kW 8 units 2040 Arms
PBRM80V3240A135kW Coming soon 3240 A 135 kW 9 units 2340 Arms
PBRM80V3600A150kW Coming soon 3600 A 150 kW 10 units 2640 Arms
PBRM200V420A30kW 200 V 420 A 30 kW 2 units 40 mVrms 130 Arms
PBRM200V630A45kW 630 A 45 kW 3 units 160 Arms
PBRM200V840A60kW 840 A 60 kW 4 units 190 Arms
PBRM200V1050A75kW 1050 A 75 kW 5 units 220 Arms
PBRM200V1260A90kW 1260 A 90 kW 6 units 250 Arms
PBRM200V1470A105kW 1470 A 105 kW 7 units 280 Arms
PBRM200V1680A120kW 1680 A 120 kW 8 units 310 Arms
PBRM200V1890A135kW Coming soon 1890 A 135 kW 9 units 340 Arms
PBRM200V2100A150kW Coming soon 2100 A 150 kW 10 units 370 Arms
PBRM500V200A30kW 500 V 200 A 30 kW 2 units 70 mVrms 53 Arms
PBRM500V300A45kW 300 A 45 kW 3 units 58 Arms
PBRM500V400A60kW 400 A 60 kW 4 units 63 Arms
PBRM500V500A75kW 500 A 75 kW 5 units 68 Arms
PBRM500V600A90kW 600 A 90 kW 6 units 73 Arms
PBRM500V700A105kW 700 A 105 kW 7 units 78 Arms
PBRM500V800A120kW 800 A 120 kW 8 units 83 Arms
PBRM500V900A135kW Coming soon 900 A 135 kW 9 units 88 Arms
PBRM500V1000A150kW Coming soon 1000 A 150 kW 10 units 93 Arms
PBRM850V106A30kW 850 V 106 A 30 kW 2 units 250 mVrms 45 Arms
PBRM850V159A45kW 159 A 45 kW 3 units 45 Arms
PBRM850V212A60kW 212 A 60 kW 4 units 45 Arms
PBRM850V265A75kW 265 A 75 kW 5 units 45 Arms
PBRM850V318A90kW 318 A 90 kW 6 units 45 Arms
PBRM850V371A105kW 371 A 105 kW 7 units 45 Arms
PBRM850V424A120kW 424 A 120 kW 8 units 45 Arms
PBRM850V477A135kW Coming soon 477 A 135 kW 9 units 45 Arms
PBRM850V530A150kW Coming soon 530 A 150 kW 10 units 45 Arms
PBRM1500V60A30kW 1500 V 60 A 30 kW 2 units 400 mVrms 60 Arms
PBRM1500V90A45kW 90 A 45 kW 3 units 60 Arms
PBRM1500V120A60kW 120 A 60 kW 4 units 60 Arms
PBRM1500V150A75kW 150 A 75 kW 5 units 60 Arms
PBRM1500V180A90kW 180 A 90 kW 6 units 60 Arms
PBRM1500V210A105kW 210 A 105 kW 7 units 60 Arms
PBRM1500V240A120kW 240 A 120 kW 8 units 60 Arms
PBRM1500V270A135kW Coming soon 270 A 135 kW 9 units 60 Arms
PBRM1500V300A150kW Coming soon 300 A 150 kW 10 units 60 Arms

*It is designed to consume on the premises all regenerated power.
*Note that the PBRM series does not have the rated output test while we guarantee the operation of the PBR series embedded in the PBRM series.

PBR series can be found here.

Functions

Advanced Features with Front USB Port

No data logger or no always connected computer required

Shortening the time of wiring and preparation, Suited for cycle tests in areas where computers are prohibited.

front USB port | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision
Features:Built-in data logging
Data logging captures the output data at the fastest interval of 0.1 seconds by inserting the USB memory stick. You can also use the included application (Matsusada Log Viewer: MLV) to view log data and output it in CSV format.
Use in places where you cannot always connect a computer
With the attached application (Matsusada Sequence Software: MSS), you can save the sequence program data to the USB memory and load it from the front USB port. Thus, the program operation is available by the power supply only.

Application Package (Attached)

Three types of application software are included as standard. Data can be linked using the front USB port.

⑴ Test Sequence function: MSS (Matsusada test Sequence Software)

Easy to use for beginners

Matsusada Sequence Software (MSS) enables you to create sequence programs simply by setting parameters, even if you have no programming knowledge.
The software makes it easier and more convenient to create a test sequence program. The created sequence data can be saved to USB memory, and up to 1,024 steps of the sequence program can be loaded.

Sequence program function | PBR series | Bidirectional (Regenerative) DC Power supply| Bidirectional (Regenerative) DC Power supply | Matsusada Precision

⑵ Operation log display: MLV (Matsusada Log Viewer)

Instant graphing of operation logs

Operation log display function: Matsusada Log Viewer: MLV, the attached software can read and graph the operation log.

Easy editing of operation logs

MLV can select items you need and save them in CSV format, so you can also edit the data in spreadsheet software with no problem.

Operation log display | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

⑶ Battery simulator: MBS (Matsusada Battery Simulator)

Easy setting of battery operation with graphs

MBS can readily perform simulations of the I-V characteristic curve for the battery. And, the voltage/current can be set up to 1001 within the rated voltage/current values, enabling more linear characteristic simulation.
Patterns created by the dedicated software can be saved in the USB memory and loaded from the front USB port.
You can perform intuitively by entering numerical values while looking at the graph, or directly dragging the graph to make settings.
The PBR/PBRM series can simulate high-voltage batteries up to 1500V.

An explanation of the battery simulator is here.
Inverter/motor evaluation | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

SOC Automated Variable System (Option): -LAsoc

LAsoc | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

Calculating the battery charge rate and automatically switching the I-V curve

This can help smoothly perform an evaluation of objects according to changes in the charge rate.
The software calculates the battery charge rate (%) from the power running as well as regenerative operation times and current values, and automatically switches the created I-V curve. SOC will fall at power running operation and will rise at regenerative operation. In addition, up to 100 graph patterns can be generated.

Remote Control Software (Additional Products): DigiCon Series

DigiCon is an application software that remotely controls Matsusada Precision's DC power supplies connected via LAN
The software can control multiple power supplies simultaneously or individually.

  • Power control for PRKT, PRT/PRTM, PBR/PBRM series
  • Full remote control available
  • Consists of "configuration software" and "operation software
  • Linkage to digital multimeters, data loggers, and thermostatic chambers is possible.
  • Easy operation with Graphical User Interface (GUI)
  • Automatic Test Equipment (ATE) can be built without programming knowledge.
  • Real-time logging, graphing, and data storage

Link with digital multimeters, data loggers, and thermostatic chambers is possible.

Program transitions can be made in response to external conditions by linking with measuring instruments such as digital multimeters and data loggers, as well as thermostatic chambers.
This advanced function allows the program to transition to the next step when the end condition of the instrument is met without waiting for a set time, or to safely terminate the program if a problem occurs during operation.

Link with digital multimeters, data loggers, and thermostatic chambers is possible. | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

Easy operation enables speedy construction of Automatic Test Equipment (ATE)

Graphical user interface, including graphical display of set values, allows easy operation.
Automatic Test Equipment (ATE) and inspection systems can be built without programming knowledge.
It can be used in many fields and applications, such as long-term reliability testing of electronic equipment and devices in the automotive, home appliance, and medical fields.

Easy operation enables speedy construction of Automatic Test Equipment | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

Large Color Touch Panel Screen

PBR/PBRM series comes with a large color touch panel, realizing its operability and visibility improvement.

  • Easy setting of output voltage, current, power, and other parameters!
  • Simple setting to complex sequence program!
  • New feature with more selectable error detections!
  • Quick check of the power running/regeneration operation mode with colorful display
  • Equally available in a conventional configuration with the setting dial
Regenerative DC Power Supply | Large Color Touch Panel | Matsusada Precision

Automated Test Function

The automated test function allows the programming of parameters such as step time, step amplitude, ramp, CV/CC mode, sequence end setting, step jump, and jump count by simply operating on the front panel. This option enables to generate optional waveforms, and you can use a great variety of applications including testing evaluation, and verification.
You can create the sequence data using our attached software

Program as image
Sequence Programming Function | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision
  • Step setting time 0.0 to 3,600 s
  • For one program, a maximum of 1,024 steps can be configured and saved.
  • CV/CC mode can be set for each program.
  • Repetition frequency: infinity, or 1 to 999 Program as Image

CV/CC Priority Setting Function

CV/CC Priority Setting Function | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

CV (Constant Voltage) priority/CC (Constant Current) priority mode can be selected and set. As is the case with diodes, a load tends to suddenly change the resistance at certain points. When the device is started in CV mode, the current will be a momentary overshot. In the PBR series, select the CC priority mode to suppress the occurrence of overshoot. The function can reduce the risk of damaging expensive loads such as high-power laser diodes.

Variable Internal Resistance Function (in CV mode)

Set the internal resistance to any value to generate a voltage drop when the load current flows.
Batteries, photovoltaic cells, and fuel cells can be simulated.
(The setting range of the internal resistance value is from 0 Ω to the rated voltage/rated current.)

Variable Internal Resistance Function | PBR series | Bidirectional DC Power Supplies | Matsusada Precision

Preset Memory Function

The series comes with the preset memory function by which the preset values can be automatically saved at power off.
Additionally, the storage of up to three respective setting values of the output voltage/current/power is available.

Secure Analog remote control

The external analog remote control of voltage/current/power is isolated from the output of the power supply as standard.
When controlling/monitoring multiple power supplies, you can use the product more securely as the external analog input/output control has a chassis (ground) potential.

External Analog Remote Control

External output ON/OFF

The output can be turned ON/OFF by the external relay or TTL signal. The logic of the signal can be selected by 5 V input.

Remote sensing

It ensures the prevention of stability deterioration caused by the voltage drop (VO-VL) by the resistance (R) of the output wire and the contact resistance (up to 0.5 V).

Remote/Local mode setting

Up to three modes selected from output voltage control, output current control, output power control, resistance, overvoltage protection, overcurrent protection, and overpower protection can be switched by relay or TTl signal.

Status output

Flexible error detection function!

Output monitor

(Voltage, Current)

Output control

(Voltage, Current, Power, Resistance, Overvoltage protection, Overcurrent protection, Overpower protection)
Select only the functions you need! Prepare the lowest command voltage!
Up to three settings are selectable in voltage, current, power, resistance, OVP, OCP, and OPP.

For details, download the datasheet below.

Residual voltage detection LED

Use for checking residual voltage

The LED on the rear panel blinks when there is voltage remaining on the DC input/output terminals in output or at output off (only in the power running operation).
It is useful for reference to check if the voltage remains. Be sure to check the voltage before the operation of the unit.

Residual voltage detection LED | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

Two-mode Lock Function

The lock function is available with two modes: "Full" to lock all front panel operations and "Normal" to lock all operations except the ON/OFF switch.
With the “full” lock mode, all operations on the front panel are locked to prevent erroneous operations. Meanwhile, the “normal” lock mode can lock all operations except the ON/OFF switch in which the emergency stop is enabled. It is a useful function that ensures what you consider to be “safety”. This is a convenient function that ensures what customers consider to be "safety".

Two-mode Lock Function | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

Password Function New function

In this function, to cancel the two-mode lock function, input a 4-digit PIN code. (Enable/Disable is selectable.)

Two-mode Lock Function | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

PBR-BT: Battery Charge/Discharge Software (sold separately) NEW

for more intuitive operation

While struggling to develop the charge/discharge software aiming for more intuitive operation, we have finally introduced the dedicated software to the PBR/PBRM series.

PBR-BT | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

Battery Cycle Test Software Demo Video
The following video shows an image of its use.

Battery Cycle Test Software Demo Video | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

Functions and Features

Simple setting to complex charge/discharge sequences

Dragging and dropping icons in the following modes for setting
Sequences pattern| PBR series | Bidirectional DC Power Supplies (Regenerative DC Power Supplies) | Matsusada Precision It provides an easy operation that enables even a novice in software development to create the software easily. Once creating a sequence initially, it can be saved and recalled almost unlimitedly (depending on the storage capacity of your computer) so that you can readily run various patterns of tests you have created.

Battery Charge/Discharge Software | PBR series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision
*The setting app screen image
Real-time monitoring of voltage and temperature of each cell

By connecting a data logger, the measurement and checking of the voltage and temperature of each cell are available in real time.

Quick setting to enable/disable or skip steps

Select the checkbox so that you can immediately enable/disable the set sequence step.
It is available even during the operation, so you do not need to stop the output when you change the same sequence according to your needs.
In addition, the skip function allows you to end the current step and move to the next step by pressing the skip button on the software screen.

High precision data management linked to measurement devices

The high-precision measurement is available with a multimeter instead of the PBR unit.
By connecting a multimeter, measurement data (voltage, current, power (calculated from voltage and current), and temperature) can be imported into our software for batch management.
Thanks to the features, high-performance data management is provided without the troublesome operation of collating the data. It was impossible up until now since conventional charge/discharge software could not be linked to external measuring instruments.

Graph display of PBR/PBRM operation log data

Using MLV, Matsusada Precision's operation log display software, the sequence log data appears in the graph.

Step transition condition in CSV format

Step transition conditions (transition time/transition condition/destination) can be created in CSV format.

CSV output format for operation log data

The operation log data (output voltage/current/power/battery charge rate/elapsed time, etc.) can be output in CSV format.
As you have only to pick up the necessary information and edit it freely using spreadsheet software, etc., it contributes to reducing the time to create experiment reports, etc.

Link with temperature chamber (coming soon)

By linking with a temperature chamber, you can set the execution temperature for each step at the sequence execution. There is no need to configure at the temperature chamber side, which can save the setup time for heat cycle tests, etc.

CAN communication with BMC, BMS, and BMU

With a CAN conversion adapter for PC, you can check commands from BMC, BMS, and BMU via CAN communication as well as use them as the transition condition.

Multiple-use data logger (optional)

Multiple uses of data logger up to 120 channels in 8 units to have the cell voltage, cell temperature, etc. of the battery modules. (Up to 15 channels per unit available as standard equipment) The acquired data is saved and used for charge/discharge safety control, cell balancing as well as deterioration checking of batteries.

For details, download the datasheet below.

Specifications

For details, download the datasheet below.

Option

-LAsoc

SOC automated variable system *1
Refer to "SOC Automated Variable Function (Option)".

-LBr

Protective breaker
One overcurrent protection device with a circuit breaker is installed in each rack.
This option is only available for models with six or fewer installed power supplies.

-LCa

CAN interface port *1 *2
Using CAN communications, output controlling and operation status monitoring of these devices can be performed.

-LEb

Eye bolts
Four eyebolts mounted to the top side allow you to move the product using cranes.

-LGob

Optical interface port *1 *2

  • -LGob: Optical interface port + optical cable 2 meters
  • -LGob(Fc5): Optical interface port + optical cable 5 meters
  • -LGob(Fc10): Optical interface port + optical cable 10 meters
  • -LGob(Fc20): Optical interface port + optical cable 20 meters
  • -LGob(Fc40): Optical interface port + optical cable 40 meters

With optical communication, the unit is remotely controlled by isolating. As complete isolation is provided by means of optical fiber, this enables advanced prevention of erroneous operation involved with transient phenomenon caused by surges, inductive lightning, external noise, etc.

The optical communication adapter at the control side is sold separately.
  • for LAN: CO-E32
  • for USB: USB-OPT
  • for RS-232C: CO-OPT2-25, CO-OPT2-9
  • for RS-485: CO-OPT4-25
  • for GPIB: CO-G32 (Discontinued in December 2028)
-LRs

RS-232C/RS-485 interface port *1 *2
Using RS-232C/RS-485 communications, output controlling and operation status monitoring of these devices can be performed.

-L(400V)

System power supply rated voltage 380 Vac to 440 Vac
Models of 500 V, 850 V, and 1500 V are available with the system power supply rated voltage 380 Vac to 440 Vac, three-phase, 50 Hz/60 Hz.

Other options

Customized specifications of rack, Safety cover, etc.
Customized specifications as of Rack, Safety cover for mistaken input prevention, Blank panel, Emergency stop button, and other options are available on request. Please feel free to contact us.

  1. Installed only on the Master unit. The Slave unit can be used alone, but no option is supplied.
    If you need an option for the Slave unit, please contact us.
  2. Selecting each individual option simultaneously in -LCa, -LGob, and -LRs is not allowed.

How to order

When ordering, add Option No. to Model No. in alphabetical order followed by the input voltage.
Example: PBRM500V500A75kW-LBrGob(Fc10)(400V), PBRM500V500A75kW-LCaEb

ADDITIONAL PRODUCTS

Battery Cycle Test Software

Model Name: PBR-BT
The advanced battery test and emulation software is designed for high-voltage battery simulations and charge/discharge tests.
For details, download the datasheet below.

Remote Control Software

Model Name: DigiCon-PBRM
DigiCon is an application software that remotely controls Matsusada Precision's DC power supplies connected via LAN.
The software can control multiple power supplies simultaneously or individually.
For details, Refer to "Remote Control Software".

Anchors: Material stainless steel plates (in pair)

Model No. RAC-AMF
Only one pair (2 pcs) is available per unit.

Numbers can be used
2 pieces (pair)
Material Stainless steel plates | PBRM series | Bidirectional (Regenerative) DC Power supply | Matsusada Precision

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