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Power Electronics Europe News
Cosel adds 300W AC/DC power supply for robotic controllers
The RBC300F is an open-frame AC/DC power supply which offers three configurable isolated outputs, one of which has a reinforced isolation to power IGBT or equivalent applications.

It simplifies the design process by reducing the need for an extra isolation transformer when connected to a distribution panel. Other features are built-in digital control in the primary and an option with extended UART communication interface for control, monitoring and sequencing.

Suitable for worldwide applications, the RBC300F accepts input voltages of 85 to 264V AC, single phase, and delivers an output power of 300W. To reduce complexity and to offer more design option, there are three independent outputs. The master output can deliver 240W and is available in three output versions: 12V/16A, 24/10A and 48V/5A.

The second output can host configured modules with single or dual outputs of 5V/3A, 12V/1.3A, 24V/0.65A, ±12V/0.6A, ±15V0.5A, 3.3V/5A, 5V/5A, 12V/2.5A, 16.5V/1.9A, 24V/1.3A, 48V/0.65A, ±12V/0.7A and ±15V/0.7A with a power of 14.4 to 30W depending on the output voltage.

The third output can host any of the single output voltage modules in the same power level. For higher voltages, outputs can be connected in series. All output voltages are adjustable via a built-in potentiometer.

Applications in robotics control are often powered by 24V or 48V bus voltage. In such applications the distribution bus might be subject to repetitive peak energy demand, requiring the power supply to sustain such load conditions. The 24V and 48V output modules operate efficiently in peak load conditions and can sustain up to 150% peak current.

The reinforced isolation of output three is suitable to supply voltages to IGBTs or IPMs, which reduces the number of power supplies required to power robotic controllers. By integrating a reinforced isolated output, the RBC300F has an equivalent footprint  40% lower than conventional solutions, says Cosel.

The master output DC/DC converter is based on an LLC resonant topology when the second and third outputs are using quasi-resonant-flyback topology.

The RBC300F has built-in inrush current limitation, over-current and over-voltage protection.

Input to output isolation is 3,000V AC, and an input to ground isolation is 2,000V AC. The isolation voltage between the three outputs has been optimised for robotic controllers applications. Isolation between the master output and output two corresponds to a functional isolation of 500V AC when the isolation between the master output, output two and the third output is reinforced to 3,000V AC.

The power supply is designed for convection cooling and can be operated from -20 to 70°C. Depending on the final equipment assembling and cooling conditions, a derating may apply.

Several options are also available, for example coating, low leakage current, different types of chassis and cover, on/off remote control, vertical screws on the terminal block and external hold-up capacitor input.

There is also an option with an extended-UART digital interface supporting 49 commands for monitoring, controlling and sequencing. Operating data can be stored and locked inside the internal memory, and recorded error codes can be used for analysis and the recording of operational hours for preventive maintenance.

The power supply is certified to IEC/EN62477-1 OVC III and complies with EN61558-2-16, for direct connection to the installation distribution panel, eliminating the need for an additional isolation transformer. Other certifications are UL62368-1, C-UL (equivalent to CAN/CSA-C22.2 No.62368-1) and EN62368-1.

The design features an integral input filter, and conducted noise complies with FCC-B, VCCI-B, CISPR11-B, CISPR32-B, EN55011-B, EN55032-B and the harmonic current emission with the IEC61000-3-2 (class A).

The RBC300F measures 114 x 38.3 x 203mm (4.49 x 1.5 x 7.99 inches) and weighs 710g (max). An optional chassis with cover is available on request, as well as a vertical mounting terminal block.

It is covered by a five year warranty.

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