Application Note 08/03/15 Rev. A Paralleling Capability of SynQor Converters ® ® Paralleling Capability of SynQor Converters Application Note Summary This application note provides an overview of the paralleling capabilities of the different SynQor power converter families. Introduction Many SynQor power converters have built-in paralleling capability. This functionality allows increased total load power and, with output OR’ing FET’s or diodes, allows a configuration for N+1 redundancy. The table that follows provides a summary of whether, for a given converter family, paralleling is built into the design. It also includes some additional information about how the converter design implements the current sharing feature. For converters that do not have built-in paralleling capability, the table indicates whether they may be made to operate in parallel with the addition of an external current sharing circuit that makes adjustment to the converter’s Remote-Sense or Trim inputs. Types of Current-Share Methods Different current sharing methods are implemented in SynQor converters. These include analog control, digital control, and droop share. The following is a description of these methods. Converters using an analog current-share method have a “share” control bus with a voltage that represents the average current per paralleled converter connected. With this current-share method all the converters operate without any single converter being in overall control, i.e., there is no master. An advantage of analog current sharing is that an individual converter in a power system can stop working and the remaining converters will continue to provide power to the load without interruption or shutdown. The digital current-share method utilizes a high-speed two-wire serial communication bus to force each converter to share current equally. With this method one converter automatically becomes the master and all the remaining converters become slaves. If the master shuts down for any reason, the slaves also shut down. The slaves will then automatically restart and pick a new master. Advantages of the digital current-sharing method include superior current share accuracy during start-up and during transient events due to cycle-by-cycle matching of each converter’s internal switching duty cycle and reduced input and output ripple and noise. Converters designed for the droop current-share method reduce their output voltage as the output current increases. At lighter loads the output voltage is higher and at heavier loads it is lower. This is graphically represented as output voltage vs. output current, known as a load-line, that slopes downward as current is increased. Converters connected in parallel using the droop share method will share the current in accordance with how well their load-lines are matched. The advantage of this method of paralleling is ease of implementation since there is no share bus or serial communication between modules. For best parallel operation and performance, please refer to the application guidelines in the product datasheet. There you will find helpful suggestions and example application circuits. The tables below show, for each converter family, whether it has a built-in current sharing capability or whether it can be controlled to share with external components. Often there are several versions of converters available within a converter family. To determine the specific version that includes built-in current sharing, please check the ordering section of the individual product datasheet. SynQor - Advancing the Power Curve • 888-567-9596 • www.synqor.com Doc. #065-0000053 Page 1 Application Note 08/03/15 Rev. A Paralleling Capability by SynQor Converter Type Built-In Paralleling Capability Full Brick Half Brick Quarter Brick Eighth Brick SynQor Converter Family Sixteenth Brick Converter Size Paralleling Capability with External Circuit PowerQor No FB Yes, Analog Method EB QB No QB No QB No HB Yes, Analog Method QB PQ24 PQ30 PQ40 PQ48 No SB EB QB PQ60 HB FB Yes, Analog or Digital (PQ60xxxHZ) PQ50 PQ55 PQ65 Yes, except PQ24xxxQEx n/a Yes Yes Yes n/a Yes, except PQ60xxxQEx and PQ60xxxQZx n/a QB Method No No No QB No No QB Yes, Droop Method Yes, Droop Method n/a n/a No No QB HB HB Yes Yes, except PQ55xxxHEx Yes DualQor DQ61, 62, 63, 65 BusQor BQ50 BQ55, BQ57 PQ60120QEx17 PQ60120QEx25 PQ60120QZx33 BQ60120HEx30 PQ60120HZx50 BQ35 BQ4H SQ60 EB QB QB No HB Yes, Digital Method EB Yes, Droop Method EB HB FB Yes, Droop Method Yes, Droop Method, except EB QB HB SQ60120QEx25 No n/a n/a n/a SIP and SMT SMT No Yes, Analog Method Yes, “C” Option, Droop Method Yes, Analog or Droop Method Yes n/a n/a n/a No No HB No for SQ60120QEx25 NiQor NQ04, NQ16 NQ15 NQ20, NQ40, NQ60 NQ60, NQ90 EB QB HB iQor, ATCA IQ65 QB Note: This chart is intended as a quick reference guide to the paralleling capabilities of SynQor converters. Please feel free to contact SynQor technical support for further assistance when paralleling any specific SynQor converter. SynQor - Advancing the Power Curve • 888-567-9596 • www.synqor.com Doc. #065-0000053 Page 2 Application Note 08/03/15 Rev. A Paralleling Capability by SynQor Converter Type Built-In Paralleling Capability Full Brick Half Brick Quarter Brick Eighth Brick SynQor Converter Family Sixteenth Brick Converter Size Paralleling Capability with External Circuit InQor IQ12, IQ18 SB QB HB SB QB IQ24 HB QB IQ32 HB IQ36 IQ48 SB QB HB SB QB HB IQ64, IQ68, IQ70, IQ72, IQ90, IQ1B IQ2H IQ4H QB HB No No No Yes for IQ32xxxHZx, No all others No No Yes for IQ48xxxHZx, No all others Yes Yes Yes, except IQ24xxxHEx and IQ24xxxHZx Yes Yes, except IQ32xxxHZx Yes Yes Yes, except IQ48xxxHZx No Yes Yes for IQ24xxxHZx, No all others No QB No HB FB Yes, Analog Method QB Yes Yes n/a InQor DC Filters IQxxxPFQT QB No No QB HB No Yes QB No Yes All No No All Yes, Droop Method n/a HB Yes, Analog Method n/a HB No No RailQor RQ18, RQ68, RQ72, RQ1B CFQor CF12, CF24, CF48 ACuQor G-Series AQ0800-AQ1400 E-Series AQ0300 - AQ1500 PFCQor PFCU390HPx07 AC Filters ACLFxxxHT Note: This chart is intended as a quick reference guide to the paralleling capabilities of SynQor converters. Please feel free to contact SynQor technical support for further assistance when paralleling any specific SynQor converter. SynQor - Advancing the Power Curve • 888-567-9596 • www.synqor.com Doc. #065-0000053 Page 3 Application Note 08/03/15 Rev. A SynQor Converter Family MilQor Hi-REL Hi-REL Single Output MQFL-28, MQFL-28E, MQFL-28V, MQFL-28VE MQFL-270, MQFL-270L MQHL-28, MQHL-28E MQBL-28, MQBL-28E MQSA-28, MQSA-28E Hi-REL Dual Output MQFL-28, MQFL-28E, MQFL-28V, MQFL-28VE MQFL-270 MQHL-28, MQHL-28E MQBL-28, MQBL-28E MQSA-28, MQSA-28E Paralleling Capability by SynQor Converter Type Converter Size Built-In Paralleling Capability Paralleling Capability with External Circuit n/a FL Package Yes, Analog Method FL Package HL Package BL Package SA Package Yes, Analog Method No No No n/a Yes Yes Yes FL Package Yes, Analog Method n/a FL Package HL Package BL Package SA Package Yes, Analog Method No No No n/a No No No FL Package Yes, Droop Method n/a FL Package No No HL Package No No Hi-Rel BusQor MQBQ-28, MQBQ-270 Hi-Rel DC Filters MQME-28, MQME-28E, MQME-270, MQME-270L MQHE-28, MQHE-28E, MQHE-270, MQHE-270L Note: This chart is intended as a quick reference guide to the paralleling capabilities of SynQor converters. Please feel free to contact SynQor technical support for further assistance when paralleling any specific SynQor converter. SynQor - Advancing the Power Curve • 888-567-9596 • www.synqor.com Doc. #065-0000053 Page 4 Application Note 08/03/15 Rev. A Paralleling Capability by SynQor Converter Type Built-In Paralleling Capability Full Brick DB QB Half Brick SB Quarter Brick Demi Brick SynQor Converter Family Sixteenth Brick Converter Size Paralleling Capability with External Circuit MilQor MCOTS MCOTS Single Output No Yes, Digital Method, -28-xx-xZ, No all others Yes, Digital Method, -28E-xx-HZ No Yes, Digital Method, -28V-xx-HZ, No all others No Yes, Digital Method, -48-xx-HZ, No all others No No Yes, Analog Method Yes, Analog Method Yes, Analog Method Yes, except -28-xx-QE HB Yes, Droop Method n/a HB Yes, Analog or Droop Method Yes, Analog or Droop Method No n/a n/a No No Yes, Analog Method No Yes, Analog Method No n/a No n/a DB QB HB No No HB No No MCOTS-C-28 HB FB MCOTS-C-28E HB QB MCOTS-C-28V, -28VE HB SB QB MCOTS-C-48 MCOTS-C-150 MCOTS-C-270 HB QB QB HB FB MCOTS-C-270N MCOTS-C-270H HB FB Yes, except -28-xx-xZ No Yes Yes, except -28V-xx-HZ Yes Yes, except -48-xx-HZ Yes Yes n/a n/a n/a MCOTS BusQor MCOTS-B-270, -600 MCOTS Non-Isolated MCOTS-N-28V-60-HG MCOTS-N-28VE-90-HG MCOTS-N12-Q3P1N-QT HB QB MPFCQor MPFC-U-390 MPFC-115-270 QB HB QB HB MCOTS DC Filter MCOTS -F-28, -48, -270 MCOTS AC Filter ACF-xxx-230 Note: This chart is intended as a quick reference guide to the paralleling capabilities of SynQor converters. Please feel free to contact SynQor technical support for further assistance when paralleling any specific SynQor converter. SynQor - Advancing the Power Curve • 888-567-9596 • www.synqor.com Doc. #065-0000053 Page 5 Application Note 08/03/15 Rev. A SynQor Converter Family MultiQor Paralleling Capability by SynQor Converter Type Converter Size Built-In Paralleling Capability Paralleling Capability with External Circuit MTQ-Px-DC28T All Yes for P3 only, digital method, paralleling only for two or three -28-xx-HZ half bricks within the assembly but not with other MTQ assemblies. (No for P1, P2, and P4) P1 & P3 Yes, except -28-xxQE and -28-xx-HZ P2 Yes, except -28-xx-QE P4 Yes, except -28-xx-QE and -28-xx-HZ MTQ-Px-28 All No No VPX VPX-3U-DC28P-001 3U VPX-6U-DC28P-001 6U Yes, digital on +12V Main, analog on +5V and +3.3V Main, No paralleling on Aux outputs. Yes, digital on +12V Main, analog on +5V Main. No paralleling on Aux outputs. No for Auxillary Outputs No fo Auxillary Outputs UPS UPS-1500-x-xU 1U or 2U UPS-3000-S-2U 2U Yes for AC output and DC2 output (droop method), No for DC1 output Yes for AC output, No for DC1 output 2U Yes n/a 1U Yes for AC output and DC2 output (droop method), No for DC1 output No for DC1 Output 1U Yes n/a No for DC1 Output No for DC1 Dual Outputs EBM EBM-1000-2U-28-3000 MPC MPC-1500-1U MPS MPS-4000-1U Note: This chart is intended as a quick reference guide to the paralleling capabilities of SynQor converters. Please feel free to contact SynQor technical support for further assistance when paralleling any specific SynQor converter. SynQor - Advancing the Power Curve • 888-567-9596 • www.synqor.com Doc. #065-0000053 Page 6