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Mean Well

Mean Well RSP Series Low-Profile Power Supplies

Power Factor Correction Functionality


Mean Well RSP-320-24 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.

Simple Valley-fill Circuit

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)
Min.
Max.
Volts
Current
Watts
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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