Mean Well RSP Series Low-Profile Power Supplies

Power Factor Correction Functionality

MEAN WELL RSP Series power supplies are low-profile AC/DC enclosed switching power supplies ideal for energy saving, low noise and limited space applications. The 75W to 200W feature an ultra-low profile of 30mm and up to 90% efficiency rate with free air convection cooling. The 320W to 2000W feature a 1U low-profile, with built-in fan.

Features of the Mean Well RSP Series

Lower cost and higher efficiency
Power factor correction
Various outputs – 75W to 3000W
Longer lifespan than previous generation
Complete protection – overload, short circuit, overvoltage

RSP Series Applications

Mechanical and electrical equipment
Appliances (vending machine, coffee machine, etc.)
Instruments
Industrial Automation

Power Factor Correction

Power factor can be defined as the ratio of the real power flowing to the load to the apparent power in the circuit. Unfortunately, if the power factor is less than one, that means the current and voltage are not in phase, which can lead to many problems in electronic designs. Negative power factor occurs as a result of a load that generates power and acts as a source which flows back towards the main source.

There are common symptoms to determine if a system needs power factor correction such as motor failures, electronic equipment failures, overheating, or unstable operation. Low power factor also draws more current which increases energy lost in the distribution system. This contributes to larger wires and expensive equipment in conjunction with the low power factor which drives up the cost for industrial or commercial customers.

Depending on the load type, if a circuit has a linear load has a low power factor, it could be corrected with capacitors or inductors. In the case of non-linear loads, passive or active power factor correction can be used to raise the power factor as well as counteract the current distortion.

Active Power Factor Correction

Active PFC uses power electronics to change the waveform of the current drawn by a load to improve the power factor. There are a variety of active PFC circuits, but a boost converter inserted between a bridge rectifier and the main input capacitors is the common practice used in a switched-mode power supply.

Block Diagram from RSP-320

Figure 1 - Block Diagram from MEAN WELL RSP-320 datasheet

Based on the block diagram (Figure 1), we see that once regulated DC voltage comes from the power switching, it goes through a bridge rectifier, boost converter, and then a filter. The boost converter tries to maintain a constant DC voltage at the output, while drawing a current that has the same frequency and is in phase with the line voltage. It is then fed back into a detection circuit which determines the power quality to see if PFC is needed.

Passive Power Factor Correction

One of the easiest methods of passive PFC is to use a filter that passes current at 50 or 60 Hz, known as the line frequency, in order to control harmonic current. The purpose is to make the non-linear device similar to a linear load by designing a filter consisting of capacitors or inductors. A valley-fill circuit (Figure 2) is an example of passive PFC that can be used.

Figure 2 - Simple Valley-fill Circuit taken from Wikipedia

Once AC voltage is applied to the circuit, the rectified line voltage is applied across C1 and C2 and charges both capacitors. As they are both charged via D3 and the resistor, C1 and C2 are each charged up to approximately half of the peak line voltage. If the line voltage falls into the "valley" phase, Vout falls toward half of the peak line voltage. At this point, both capacitors begin to discharge into the load at Vout, due to D1 and D2 respectively. A resistor is needed to protect against electromagnetic interference (EMI) and a large in-rush current.

Power Factor Correction Benefits

There are many benefits to PFC based off the complications that can arise without PFC as explained earlier. PFC helps lower generation and transmission costs for distribution systems, utility bills for consumers, and mean time between failures for components used in power systems such as motors. The technical benefits include a reduction in voltage drops, harmonic distortions, and kVA demands which is a huge benefit in any industry that has not utilized power supplies with PFC. This ultimately, improves power quality and lowers cost which is extremely beneficial to any company, especially in engineering designs.

Model	AC Input Voltage Range		Output			Dimensions L x W x H (mm)
Model	Min.	Max.	Volts	Current	Watts	Dimensions L x W x H (mm)
RSP-75 Series
RSP-75-3.3	85	264	3.3V	15A	49.5W	159 X 97 X 30
RSP-75-5	85	264	5V	15A	75W	159 X 97 X 30
RSP-75-7.5	85	264	7.5V	10A	75W	159 X 97 X 30
RSP-75-12	85	264	12V	6.3A	75.6W	159 X 97 X 30
RSP-75-13.5	85	264	13.5V	5.6A	75.6W	159 X 97 X 30
RSP-75-15	85	264	15V	5A	75W	159 X 97 X 30
RSP-75-24	85	264	24V	3.2A	76.8W	159 X 97 X 30
RSP-75-27	85	264	27V	2.8A	75.6W	159 X 97 X 30
RSP-75-48	85	264	48V	1.6A	76.8W	159 X 97 X 30
RSP-100 Series
RSP-100-3.3	85	264	3.3V	20A	66W	179 X 99 X 30
RSP-100-5	85	264	5V	20A	100W	179 X 99 X 30
RSP-100-7.5	85	264	7.5V	13.5A	101.3W	179 X 99 X 30
RSP-100-12	85	264	12V	8.5A	102W	179 X 99 X 30
RSP-100-13.5	85	264	13.5V	7.5A	100.3W	179 X 99 X 30
RSP-100-15	85	264	15V	6.7A	100.5W	179 X 99 X 30
RSP-100-24	85	264	24V	4.2A	100.8W	179 X 99 X 30
RSP-100-27	85	264	27V	3.8A	102.6W	179 X 99 X 30
RSP-100-48	85	264	48V	2.1A	100.8W	179 X 99 X 30
RSP-150 Series
RSP-150-3.3	85	264	3.3V	30A	99W	199 X 99 X 30
RSP-150-5	85	264	5V	30A	150W	199 X 99 X 30
RSP-150-7.5	85	264	7.5V	20A	150W	199 X 99 X 30
RSP-150-12	85	264	12V	12.5A	150W	199 X 99 X 30
RSP-150-13.5	85	264	13.5V	11.2A	151.2W	199 X 99 X 30
RSP-150-15	85	264	15V	10A	150W	199 X 99 X 30
RSP-150-24	85	264	24V	6.3A	151.2W	199 X 99 X 30
RSP-150-27	85	264	27V	5.6A	151.2W	199 X 99 X 30
RSP-150-48	85	264	48V	3.2A	153.6W	199 X 99 X 30
RSP-200 Series
RSP-200-2.5	85	264	2.5V	40A	100W	215 X 115 X 30
RSP-200-3.3	85	264	3.3V	40A	132W	215 X 115 X 30
RSP-200-4	85	264	4V	40A	160W	215 X 115 X 30
RSP-200-5	85	264	5V	40A	200W	215 X 115 X 30
RSP-200-7.5	85	264	7.5V	26.7A	200.3W	215 X 115 X 30
RSP-200-12	85	264	12V	16.7A	200.4W	215 X 115 X 30
RSP-200-13.5	85	264	13.5V	14.9A	201.2W	215 X 115 X 30
RSP-200-15	85	264	15V	13.4A	201W	215 X 115 X 30
RSP-200-24	85	264	24V	8.4A	201.6W	215 X 115 X 30
RSP-200-27	85	264	27V	7.5A	202.5W	215 X 115 X 30
RSP-200-36	85	264	36V	5.6A	200.2W	215 X 115 X 30
RSP-200-48	85	264	48V	4.2A	201.6W	215 X 115 X 30
RSP-320 Series
RSP-320-2.5	85	264	2.5V	60A	150W	215 X 115 X 30
RSP-320-3.3	85	264	3.3V	60A	198W	215 X 115 X 30
RSP-320-4	85	264	4V	60A	240W	215 X 115 X 30
RSP-320-5	85	264	5V	60A	300W	215 X 115 X 30
RSP-320-7.5	85	264	7.5V	40A	300W	215 X 115 X 30
RSP-320-12	85	264	12V	26.7A	320.4W	215 X 115 X 30
RSP-320-13.5	85	264	13.5V	23.8A	321.3W	215 X 115 X 30
RSP-320-15	85	264	15V	21.4A	321W	215 X 115 X 30
RSP-320-24	85	264	24V	13.4A	321.6W	215 X 115 X 30
RSP-320-27	85	264	27V	11.9A	321.3W	215 X 115 X 30
RSP-320-36	85	264	36V	8.9A	320.4W	215 X 115 X 30
RSP-320-48	85	264	48V	6.7A	321.6W	215 X 115 X 30
RSP-500 Series
RSP-500-3.3	85	264	3.3V	90A	297W	230 X 127 X 41
RSP-500-4	85	264	4V	90A	360W	230 X 127 X 41
RSP-500-5	85	264	5V	90A	450W	230 X 127 X 41
RSP-500-12	85	264	12V	41.7A	500.4W	230 X 127 X 41
RSP-500-15	85	264	15V	33.4A	501W	230 X 127 X 41
RSP-500-24	85	264	24V	21A	504W	230 X 127 X 41
RSP-500-27	85	264	27V	18.6A	502.2W	230 X 127 X 41
RSP-500-48	85	264	48V	10.5A	504W	230 X 127 X 41
RSP-750 Series
RSP-750-5	85	264	5V	100A	500W	250 X 127 X 41
RSP-750-12	85	264	12V	62.5A	750W	250 X 127 X 41
RSP-750-15	85	264	15V	50A	750W	250 X 127 X 41
RSP-750-24	85	264	24V	31.3A	751.2W	250 X 127 X 41
RSP-750-27	85	264	27V	27.8A	750.6W	250 X 127 X 41
RSP-750-48	85	264	48V	15.7A	753.6W	250 X 127 X 41
RSP-1000 Series
RSP-1000-12	85	264	12V	60A	720W	295 X 127 X 41
RSP-1000-15	85	264	15V	50A	750W	295 X 127 X 41
RSP-1000-24	85	264	24V	40A	960W	295 X 127 X 41
RSP-1000-27	85	264	27V	37A	999W	295 X 127 X 41
RSP-1000-48	85	264	48V	21A	1008W	295 X 127 X 41
RSP-1500 Series
RSP-1500-5	85	264	5V	240A	1200W	278 X 127 X 84
RSP-1500-12	85	264	12V	125A	1500W	278 X 127 X 84
RSP-1500-15	85	264	15V	100A	1500W	278 X 127 X 84
RSP-1500-24	85	264	24V	63A	1512W	278 X 127 X 84
RSP-1500-27	85	264	27V	56A	1512W	278 X 127 X 84
RSP-1500-48	85	264	48V	32A	1536W	278 X 127 X 84
RSP-1600 Series
RSP-1600-12	85	264	12V	125A	1500W	300 X 85 X 41
RSP-1600-24	85	264	24V	67A	1608W	300 X 85 X 41
RSP-1600-27	85	264	27V	59A	1593W	300 X 85 X 41
RSP-1600-36	85	264	36V	44.5A	1602W	300 X 85 X 41
RSP-1600-48	85	264	48V	33.5A	1608W	300 X 85 X 41
RSP-2000 Series
RSP-2000-12	85	264	12V	100A	1200W	295 X 127 X 41
RSP-2000-24	85	264	24V	80A	1920W	295 X 127 X 41
RSP-2000-48	85	264	48V	42A	2016W	295 X 127 X 41
RSP-2400 Series
RSP-2400-12	85	264	12V	166.7A	2000.4W	278 X 179 X 64
RSP-2400-24	85	264	24V	100A	2400W	278 X 179 X 64
RSP-2400-48	85	264	48V	50A	2400W	278 X 179 X 64
RSP-3000 Series
RSP-3000-12	85	264	12V	200A	2400W	278 X 179 X 64
RSP-3000-24	85	264	24V	125A	3000W	278 X 179 X 64
RSP-3000-48	85	264	48V	62.5A	3000W	278 X 179 X 64

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