DC output drive modules for reactive loads offer reverse energy protection

July 02, 2015 // By Graham Prophet
Excelsys Technologies’ (Cork, Ireland) XgR and XgT powerMods provide complete protection in industrial and medical systems with combinations of inductive and capacitive loads, increasing system robustness and reliability.

Reactive Load powerMod plug-in DC output modules are optimised for driving DC motors and other reactive loads. The provide complete protection where loads can generate high levels of reverse energy, such as in industrial and medical applications.

Frequently (says Excelsys), 24 and 48V rails are used to power pumps, motors, fans, compressors, capacitor banks, batteries, or combinations of inductive and capacitive loads, in complex systems that come with unique system design challenges. XgR and XgT powerMods maintain performance and reliability under harsh conditions and challenging applications, while still maintaining flexibility, efficiency and all the benefits — including forward and backward compatibility— of Excelsys’ existing UltiMod, Xgen, and XF platforms.

The XgR and XgT modules come equipped with a built-in OR-ing function and an anti-reversal diode. The OR-ing circuit, using a MOSFET to maintain high efficiency, offers N+1 redundancy to the user when the powerMods are used in parallel operation. The anti-reversal diode across the output, which is rated for the full current of the module, offers increased ruggedness when the modules are used in reactive load applications.

The powerMods can deliver output voltages from 8.0V to 58V, with output signals and user-configurable functions, including local and remote output voltage adjustment comprising; adjustable current limit; dynamic voltage trim/adjust, alternative current-limiting techniques; and inhibit/enable functions. The modules can be connected in series or parallel, enabling them to achieve compliance with all voltage/current requirements.

Additional standard features and options are: dual safety approvals (UL/EN60950 2nd edition and UL/EN60601-1 3rd edition and -40°C start-up temperature. Standard features for medical applications include leakage current (300 and 150 µA), 2 MOPP, and 4 kV isolation. They also include OVP, OTP, OCP, MIL STD-810G compliance with shock and vibration. All products offer highest efficiency (up to 92%), are SEMI F47 compliant and have 5-year warranties.

Typical applications include medical (e.g., clinical diagnostic equipment, medical lasers, dialysis equipment, radiological imaging, and clinical chemistry) and industrial (e.g., test and