TOA Electronics FPS1000-12, FPS1000-24, FPS-S1U Parallel and Series Operation, Parallel operation

CHAPTER 6 PARALLEL AND SERIES OPERATION

6.1 Parallel operation

Up to 8 FPS1000 units of the same output voltage rating can be connected in parallel. By connecting the CS signal between the paralleled units, automatic current balance is achieved, with +/-10% accuracy. Derate the total output current by 10% when using parallel operation to prevent overload condition.

The built-in Oring diodes on the main output and the 12V Auxiliary output allow N+1 operation. For input voltages less than 100Vac, maximum output Power derated by 10% of the Power rating.

6.1.1 Parallel operation with Remote sensing

Fig 6-1 shows typical connection of parallel operation with Remote sensing. The CS signal wires should be as short as possible and with the same length.

FPS1000		#1		+V		+S
				+S
		SIG.	ON/	-S		-S
				-V
CS		RTN	OFF
15	10		7			+S
FPS1000		#2		+V	+S	+V
				+S
						LOAD
				-S
		SIG.	ON/		-S
				-V		-V
CS		RTN	OFF
15	10		7
						-S
FPS1000		#N		+V	+S
				+S
		SIG.	ON/	-S	-S
				-V
CS		RTN	OFF

15 10

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Fig 6-1: Parallel operation with Remote sensing

6.1.2 Output voltage trimming at parallel operation

The output voltage of the units connected in parallel can be made by a single trimmer or resistive divider as shown in Fig 6-2.

V TRIM

FPS1000 #1

+S

SIG. ON/

CS RTN OFF -S

FPS1000-12:

2

15	10		7		V TRIM
FPS1000		#2	V TRIM		+V
				+S
		SIG.	ON/	-S
CS		RTN	OFF
15	10		7		-V

+S
	R1
-S	R2

R2=0.0324*V out -1.1298*Vout+9.9342 R1(KΩ)=5(KΩ)-R2(KΩ)

FPS1000-24:

R2=0.0785*V2out -5.819*Vout+105.132 R1(KΩ)=20(KΩ)-R2(KΩ)

FPS1000-32:

R2=0.0463*V2out -4.5805*Vout+109.49 R1(KΩ)=20(KΩ)-R2(KΩΩ)

V TRIM

FPS1000 #N

	SIG.	ON/	+S
			-S
CS	RTN	OFF
15	10	7

FPS1000-48:

R2=0.0497*V2out-7.2795*Vout+259.04 R1(KΩ)=50(KΩ)-R2(KΩ)

Fig 6-2: Output voltage trimming at parallel operation

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