Accessory Product

DBx Module

Ultra high-performance add-on module delivering unprecedented precision and long-term stability

The DBx Module is a series connected add-on module for MagnaDC programmable DC power supplies, which contains an ultra-high precision, high stability temperature-stabilized control loop, that monitors voltage and current to drive the power supply with any necessary error correction, offering unprecedented high-power performance. Available in a variety of configurations at various ratings, the DBx Module allows Magna-Power products to the requirements for even the most demanding applications.

Key Features

  • Add-on module for MagnaDC power supplies
  • Available from 1.5 kW to 3,000 kW+
  • Less than 10 ppm stability
  • Up to 24-bit resolution
  • Up to 10x output ripple reduction
  • Many configurations
  • Current ratings up to 20,000 Adc
  • Voltage ratings up to 1,000 Vdc
  • Voltage, current, and power control

Build-Time: 10-12 Weeks

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DBx Module introduction

Bringing ultra-high performance to the industry's broadest range of programmable DC power supplies

The DBx Module is a performance-enhancing series-connected add-on module for MagnaDC programmable DC power supplies, delivering ultra-high stability, low ripple, high precision and high accuracy, with voltage, current, and power control modes. The combination of the two products provides a broad range of magnet power supply solutions for high-energy physics and medical applications, including driving dipole, quadrupole, and steering magnets, as well as powering coils to establish stable magnetic fields. In addition, the high power density coupled with the high accuracy and low ripple characteristics make the combined solution ideal for ATE calibration applications.

Magnet steering Icon

Magnet steering

Drive highly inductive loads in current-mode control for applications in high-energy physics, magnet steering for particle accelerators, radiology research, and advanced cancer therapies.

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Calibration and metrology

High-power capable voltage and current references, with up to 24-bit precision and extremely low temperature coefficients, provides excellent R&D and ATE calibration solutions for DC-input devices.

Up to 10x Ripple Reduction

Low ripple performance

The DBx Module Configuration A1 utilizes three stages of filters to suppress differential line-to-line EMI, common-mode line-to-ground EMI, and power supply ripple from the DC bus.

Internally fabricated common-mode and differential-mode EMI filters are integrated in the DBx Module Configuration A, providing insertion loss as high as 62 dB; typical results shown in the table below.

To filter power supply output ripple voltage, with components that can extend down to the mains power frequency, the DBx Module Configuration A utilizes a linear regulator, with a low DC voltage drop across a series-pass power semiconductor.

The regulator requires two feedback loops: one to maintain a 1.25 Vdc drop across the linear regulator and the second to produce a AC ripple canceling voltage across the series-pass power semiconductor, equal and opposite of the AC ripple voltage at the input. Adding a series connected diodes across the regulator provides protection for current surging and overvoltage transients—a weak point in conventional linear regulators.

Ultra-stable, high accuracy, and high resolution

An ultra-stable fluxgate direct-current current transformer (DCCT) is used to take high accuracy isolated measurements from a series connection with the power supply’s DC output. This ultra-stable transducer, combined with the DBx Module’s low temperature drift resistors and temperature stabilized digital programming circuit, provides highly granulated programming (18-bit) and readback (24-bit), and enables long-term stability less than 5 ppm. Critical components are carefully laid out within a specially designed temperature compartment to accelerate the time to temperature stabilization.

Setup and Control

DBx Module Configurations A1 and B1 are provided with copper bus bars with threaded inserts for the DC input and DC output connections. In these configurations, the DC power supply output connects to the DBx Module's DC input and all current sensing is done internal to the DBx Module. The load / device under test gets connected to the DBx Module's DC output bus bars. DBx Module Configuration C1 uses an external DCCT with a control signal providing feedback to the DBx Module via its external user I/O connector. In all configurations, so that the DBx Module can control the power supply, a provided cable connects the DBx Module's interface connector to the power supply's JS1 37-pin external user I/O connector.

Digital programming of set points, trip points, and slew rates are performed using the DBx Module via front panel knob or keypad, front panel up-down arrows for highly granual single-bit control, or using the computer interface connections via provided MagnaWEB software or user defined software using SCPI commands. Included communication interfaces include RS485 and front/rear USB with optional TCP/IP Ethernet.

< 5 ppm stability

< 0.5 ppm/°C temperature coefficient

Up to 24-bit precision

± 0.04% accuracy

Multiple configurations to address the broadest range of applications

The DBx Module is offered in three different configurations—A1, B1, and C1—differing in maximum current capability and internal stages.

ConfigEMI/Ripple FilterHigh Stability,
Max Voltage Ratings AvailableMax Current Ratings AvailableForm Factor
A1YesYes6 to 1,000 Vdc75 Adc or 150 Adc1U Enclosure
B1NoYes5 to 1,000 Vdc75 Adc or 150 Adc1U Enclosure
C1NoYes5 to 1,000 Vdc500, 750, 1500, 3000, 5000, or 10000 Adc1U Enclosure + External Transducer

Configuration A

The DBx Module Configuration A contains all stages, including the linear regulator, differential- and common-mode DC EMI filters, temperature-stabilized ultra-high stability controller, and DCCT. Configuration A occupies a 1U (1.75” high) rack-mount enclosure and is available for voltages from 6 Vdc to 1,000 Vdc and two different max current ratings, at 75 Adc or 150 Adc.

Configuration B

The DBx Module Configuration B is intended for applications that do not require additional DC filtering and contains only the temperature-stabilized ultra-high stability controller and DCCT. Configuration B occupies a 1U rack-mount enclosure and is available for voltages from 5 Vdc to 1,000 Vdc and two different max current ratings, at 75 Adc or 150 Adc.

Configuration C

The DBx Module Configuration C is intended for high-current applications, where the 1U rack-mount enclosure contains only the temperature-stabilized ultra-high stability controller, with a provided external DCCT that ties into the DBx Module through a rear connector. Configuration C is available for voltages from 5 Vdc to 1,000 Vdc and max current ratings from 300 Adc to 10,000 Adc. For high-power MT Series systems from 100 kW to 3,000 kW+, the DBx Module can be fully integrated inside the MT Series enclosure.

Model Ordering Guide

DBx Module models are defined by the configuration type and number (see "Available Configurations" table), the maximum voltage rating, and the maximum current rating. Any voltage from Magna-Power's standard MagnaDC power supply offering is available, from 10 Vdc to 1,000 Vdc. The DBx Module resolution step size and calibration is a function of its maximum ratings, therefore it's recommend to specify a model most closely matched to the requirement.



The following specifications are subject to change without notice. Unless otherwise noted, all specifications measured at the product's maximum ratings.

Performance Specifications
Specification Value
Stability, A1 and B1 Configuration
Full width at half maximum (FWHM)

Voltage or Current Control
< 10 ppm; long-term drift (8 hr)
Stability, C1 Configuration
Full width at half maximum (FWHM)

Voltage or Current Control
< 50 ppm; long-term drift (8 hr)
Temperature Coefficient

Voltage Control
< 0.05 ppm/°C
Temperature Coefficient

Current Control
< 0.5 ppm/°C
Rise/Fall Time

Voltage Mode: 6 s, 10% to 90% full scale voltage rating
Current Mode: 6 s, 10% to 90% full scale current rating
Power Mode: 6 s, 10% to 90% full scale power rating
Power Loss

Configuration A1 Only
Current output x 1.5 volts
Warm-up Time
45 min
Programming Specifications
Specification Value
Programming Resolution
Measurement Resolution

Programming and Measurement
± 0.04% of full scale; voltage control
± 0.04% of full scale; current control
Connectivity Specifications
Specification Value
AC Input

1Φ, 2-wire + ground
IEC 60320 connector
AC Input

3Φ, 3-wire + ground
Molex 38660 connector
DC Input
Bus bars with 3/8" threaded insert; 250 Adc max
DC Output
Bus bars with 3/8" threaded insert; 250 Adc max
Communication Interfaces

USB Host (Front): Type B
USB Host (Rear): Type B
RS485 (Rear): RJ-45
External User I/O: 15-pin D-Sub, female
Communication Interfaces

LXI TCP/IP Ethernet (Rear): RJ-45
Physical Specifications
Specification Value
Size and Weight

Configuration A, Configuration B
1.75” H x 19” W x 24” D (4.4 x 48.3 x 61.0 cm)
35 lbs (15.88 kg)
Size and Weight

Configuration C
1U (See Above) + External Transducer
External transducer size and weight will vary depending on current rating
Environmental Specifications
Specification Value
Ambient Operating Temperature
0°C to 50°C
Storage Temperature
-25°C to +85°C
Relative humidity 30% to 90%, non-condensing
Air Flow
Side intake, rear exhaust
Complies with 2014/30/EU (EMC Directive)
CISPR 22 / EN 55022 Class A
Regulatory Specifications
Specification Value
CE Mark
RoHS Compliant