PMBus communication interface available for modular power supplies

12th July 2017
Anna Flockett

A standby/signal option has been announced by TDK Corporation, with a PMBus communications interface for the QM series of 700-1500W modular AC/DC power supplies. The PMBus (Power Management Bus) is an open standard digital power management protocol, allowing communication between devices. The QM series is the latest product in a 37-year legacy of modular power supplies, featuring very low audible noise and full MOPPs medical isolation. 

The new PMBus interface can be used to improve system-level power management in medical equipment, test and measurement, broadcast, communications and renewable energy applications.

The PMBus allows the user to inhibit or enable all the QM output voltages with a single command, monitor the inlet temperature, review fan speed and status, monitor run-time and determine manufacturing related data. Up to 8 units can be connected to a single PMBus controller. The standby/signal option also contains a 5V/2A standby voltage (always present when AC power is applied to the power supply), and a fan-fail warning signal indicating that a fan has stopped, is slowing down or running too fast indicating a blockage.

The interface option is selectable during the initial configuration of output voltages and current using the on-line programme from the TDK-Lambda UK website. The configurator makes product definition very easy, providing an optimised module selection for the desired output requirements.

The QM series is certified to IEC/EN/UL/CSA 60601-1, ANSI/AAMI ES 60601-1, IEC/EN 61010-1, IEC/EN/UL/CSA 60950-1 with CE marking for the Low Voltage and RoHS2 Directives. 

With an input to output isolation of 4,000Vac (2xMOPPs), 1.500Vac input to ground (1xMOPP) and 1,500Vac (1xMOPP) output to ground, the series can be used in BF rated medical equipment. 

The QM range has a maximum earth leakage current of 300µA, while still complying with the EN61000-6-3:2007 and EN60601-1-2:2015 (curve B conducted and radiated) emission standards.  The units also meet the EN60601-1-2 and EN61000-6-2 immunity standards.

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