Power
module and prevents heat gathering on certain points.
The AC/DC brick type power can be mounted on the PCB and withstand pass- through wave soldering with other SMT components also on the PCB, which saves significant installation time. Moreover, an AC/DC brick can be mounted on a PCB for pass-through soldering with other SMT components, speeding up installation time.
Fanless solutions are possible if the brick is attached to an external system cooling plate. The use of baseplate cooling means the operational temperature of the brick could be as high as 100°C, providing it is able to maintain a case temperature below 85°C. This capability is ideal if the system case (or heatsink) is in direct contact with the outside environment and then directs the heat away from the power module easily and efficiently. For conventional AC/DC power supplies, the upper operating temperature would be only around 60°C ~70°C and would also require airflow for cooling.
Improved reliability is another advantage of a AC/DC brick power supply. Generally, an AC/DC brick power does not include internal electrolytic capacitors and this extends its lifetime compared with other forms of AC/DC converter.
Taking the example of the PDF700S- CMFC from Cincon’s PDF700S series of AC/ DC brick power supplies, Figures 3 and 4 show the circuit diagram and construction of the PDF700S-CMFC, which is the complete
Figure 4: The PDF700-CMFC, showing the built-in external components set in place.
headache. Many customers were looking for turnkey solutions instead of building power boards from scratch which involved sourcing filtering components. In addition to problems around locating components, which pushed delivery
solution based on an AC/DC brick, with the external components required.
The next-generation of AC/DC brick power
Today, power system developers not only have to meet design demands, such
Type PDF700S PFC750 CBM70S CBM101S
Full-brick AC/DC module
Half-Brick PFC module
Half-brick AC/DC power supply
Full-brick AC/DC power supply
Wattage 700W
750W 70W 100W
as increased power density and small footprints, they also face a supply chain crisis. This was evident before the Covid pandemic and has been exacerbated by the global manufacturing shutdowns and logistics issues since 2020. As the global supply chain and materials shortages continued, scouring the markets for PCBA (printed circuit board assembly) services became a big
Cincon offers the following AC/DC brick power solutions: Model
Input Voltage 90~264Vac
90~264Vac 390V 90~264Vac 390V 90~264Vac 390V Output Voltage
12V, 24V, 28V, 48V, 56V
390V
12V, 24V, 36V, 48V
12V, 24V, 28V, 36V, 48V
times to ever longer periods, when components were available, they incurred a price premium, making this route more expensive and with a longer time to market. Currently, the Cincon AC/DC bricks are available on a lead time of just eight weeks. To overcome supply chain problems, Cincon provides all-in-one AC/DC bricks, which make up the CBM series. All the filtering components (e.g. inductor and capacitors) and the bulk capacitors are integrated in the brick module. The CBM AC/DC brick could be directly used without additional filters and pass the EN55032 Class B standard for domestic equipment (See Figure 5).
PFC circuitry in a half- brick Recognising the need for smaller form factors, Cincon also provides a 750W PFC module in the CBM series (Figure 6). It is designed to be placed at the AC/DC front end and provides the power system with high power factor (PF) to pass energy standard requirements. The higher PF allows the system designer to reduce input current in order to lower transmission loss. The output voltage is around 390 to 400Vdc, which means that the system hold-up time can be longer than that of the system with a simple bridge rectifier front end (typically between 160 to 330Vdc output).
Figure 5: Block diagram showing the CBM all-in-one AC/DC brick integration.
Cincon’s extensive range of AC/DC brick power supplies is available from Relec Electronics. Relec’s expertise and experience in power conversion means it can offer a custom solution. Its team of experts is able to discuss and advise on applications, specifications and governing standards for a wide range of industries and a broad portfolio of power products and additionally offer support with unique options and enhancements in all catalogue lines, together with a range of manufacturing services, such as sub-assemblies and finished products. In addition, many products complement one another, allowing customers to source many of their power supplies and displays from a single, reliable supplier.
Figure 6: Block diagram showing Cincon’s PFC750 750W PFC module.
www.cieonline.co.uk http://www.relec.co.uk Components in Electronics February 2023 49
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