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Redundancy With Low Voltage, High Output Current DC/DC Converters

From Beta Dyne Inc.
 

 
Redundancy using DC/DC converters is necessary when a power system by a DC/DC converter must remain operational in case one of the converters fail. Two or more converters are connected in parallel, but only one supplies the load at any given time while the rest of the converters are in standby mode (no load). When one of the redundant converters fails, one of the standby converters takes over the load. Figure 1 shows the positive output of two converters OR'ed through a dual, common cathode Schotky diode with the cathode connected to the load. It should be noted that the positive sense pin of each converter is connected not at the load, but at the respective anodes. Connecting the positive sense pins at the anodes side—as opposed to the load side—of the dual diode eliminates any potential chatter. Also note that a trim potentiometer is used to individually adjust each output in order to turn on one of the selected converters.
Products & Services
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DC-DC converters accept DC input and provide regulated and/or isolated DC output in various applications including computer flash memory, telecommunications equipment, and process control systems. Search by Specification | Learn more about DC-DC Converters
Product Announcements
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MITEQ, Inc. - 9800 Series Frequency Converter Product Line
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Topics of Interest
When a power supply or DC/DC converter fails in a redundant power system, the system continues to operate from one of the redundant power sources. To replace or repair the failed power source, the... (Read More)
Filtering components must be added to smooth the waveforms. To maintain high efficiency, only inductors and capacitors are added. To help stiffen the bus voltage, a capacitor is added in parallel... (Read More)
Isolated DC-DC voltage converters can provide positive or negative voltages from a single device. Most isolated converters have "floating" outputs that can withstand over 500V between the case, the... (Read More)
CHAPTER LIST Chapter 4: Introduction to DC-DC Converters The Buck Converter Chapter 5: General Theory of Two-Level DC-DC Converters Boost and Buck/Boost Converters Chapter 6: Dynamic... (Read More)
Overview NEEDS BULKY IRON-CORED DC LINK INDUCTANCE PROBLEMS OF COST, SIZE, WEIGHT AND LOSS NEEDS DEVICES WITH SYMMETRIC BLOCKING CAPABILITY LOAD IMPEDANCE DOES NOT AFFECT THE... (Read More)
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