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CFM500M/S Series Baseplate Cooling & Cover Power Supply

10

Sep

#Technical Article#AC-DC Power Supply#Medical#Industrial/ITE#Baseplate-cooling Design

Sep 10, 2021

CFM500M/S

 

Never Stop Improving Switching Power Supplies:

With the evolution of technology and product design in the fields such as industrial, telecom, medical, and consumer electronics, the demand of high-efficiency and downsized power supplies with functions like digital control, multitasking has been increasing. The efficiency and power density have the direct influence on temperature inside the end-user system. For that reason, Cincon has been dedicated to developing the high-quality power supplies with a baseplate-cooling design because heat dissipation improvement is always an ongoing mission. In this case, Cincon has released a series of baseplate-cooling and fanless power supply solutions due to the conduction characteristic. Today we are going to show you the CFM500M/S series which also have the optional case version.

 

Advantages of CFM500 Power Supply:

The structure of CFM500M/S is PFC+LLC with universal input voltage of 80 to 264Vac and the high efficiency is up to 94.5%, leading to less power loss and generation of heat. The CFM500M/S series have output power of 500W with 3” x 5” and output voltages of 12Vdc, 18Vdc, 24Vdc, 36Vdc, 48Vdc. The CFM500M/S also have the distinctive feature of low inrush current, lowering the impact on surrounding application such as fuse, switch, etc. and making the system operate stably.

 

In addition, CFM500M/S series offer various features and full protections:

• PS On/Off Remote Control

• Power Good & Power Fail Signal

• +5V Stand-by, 12V Fan Output

• OTP, OCP, Continuous Short Circuit Protection (Auto-Recover)

• Over Voltage Protection

 

The CFM500S has the safety approvals of IEC/UL/EN 62368-1 and meets the EMC standard of light/heavy industry. The product design also meets IEC/EN 60335-1 for household appliances. The CFM500M series has the safety approvals of IEC/EN/UL 60601-1 and meets 2MOPP and EMC for the medical use.

 

Baseplate Cooling & Cover Structure:

Unlike other regular power supplies, the most notable feature of CFM500M/S is that it can direct the amount of heat energy to the bottom due to the baseplate-cooling design. You may see the difference from the photos below. In general, it may take more time for people using others to solve the heat dissipation issue. However, Cincon optimizes the heat dissipation technology of CFM500M/S by directing the heat to the bottom which is the system’s case. The CFM500M/S could save users from the trouble of dealing with the heat dissipation which may have a greater chance to shorten users’ development time.

 

Others

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Cincon CFM500M/S

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Below are the standard derating curves of CFM500M/S under the natural convection condition.

 

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CFM500M/S

CFM500M/S

Based on the data of CFM500M/S, under the ambient temperature 40℃ (Natural Convection) with different conditions:
1. Input voltage 115Vac, output voltage 12Vdc, and output power would be 300W.
2. Input voltage 230Vac, output Voltage 48Vdc, and output power would be 440W.

CFM500M/S-C

CFM500M/S-C

Based on the data of CFM500M/S-C, under the ambient temperature 40℃ (Natural Convection) with different conditions:
1. Input voltage 115Vac, output Voltage 12Vdc, and output power would be 340W.
2. Input voltage 230Vac, output voltage 48Vdc, and output power would be 490W.

 

The output power could be more while the CFM500M/S are installed on the case of the user’s device or an aluminum plate. The following are the experiments tested under natural convection condition. You may find the outstanding performance of baseplate-cooling.

 

1.CFM500M/S is screwed on an aluminum plate with the size of 480 x 248 x 1.2mm to simulate the test which is run on user’s device.

 

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Input V: 115 Vac, Output V: 12Vdc, and Ambient Temperature 40 to 70℃ (Natural Convection)

Part Number CFM500M/S
Rated Power 410W 380W 340W 300W
Ambient 40℃ 50℃ 60℃ 70℃
Input EMI FILTER 93.7 96.8 102.6 109.6
PFC Inductance 103.3 105.7 109.9 116.2
PFC MOS 95.5 101.8 108 114.8
PFC FILTER CAP. 95.8 97.6 99.6 110
PFC DIODE 96.9 104.9 112 119.6
LLC MOS 100.7 105 110.1 119.1
LLC DRIVER 98.4 102.3 107.2 111.2
BRIDGE DIODE 92.7 98.7 105.5 110.9
Transformer 121.9 124 122.2 127.9
Output SR DRIVER 124.7 120.7 107.4 124
Output SR MOS 96 108.6 107.7 117
Output Pi FILTER 100.6 108.6 107.4 106.8
Output Cap.1 98.4 99.3 101.2 103
Output Cap.2 88.5 91.4 98.4 105
Output Cap.3 82.7 86.9 90.5 94.8

 

Input V: 230 Vac, Output V: 48Vdc, and Ambient Temperature 40 to 70℃ (Natural Convection)

Part Number CFM500M/S
Rated Power 500W 500W 475W 410W
Ambient 40℃ 50℃ 60℃ 70℃
Input EMI FILTER 68.2 76.8 84 90.5
PFC Inductance 90.6 98.8 102.7 106.4
PFC MOS 92.9 101.9 107.9 112.8
PFC FILTER CAP. 76.3 85 89.2 92
PFC DIODE 66.3 75.9 81.8 87.3
LLC MOS 105.7 116.1 118 119.9
LLC DRIVER 93.2 103.1 107.2 110.8
BRIDGE DIODE 82.7 91.3 97.3 101.7
Transformer 116.6 125 121.9 120.4
Output SR DRIVER 95.8 105.6 107.7 109.9
Output SR MOS 84.2 94.2 98.1 101.8
Output Pi FILTER 79 88.5 92.1 95.7
Output Cap.1 75.8 85.3 87.5 90.7
Output Cap.2 73.6 83.7 89.6 93.2
Output Cap.3 67 75.8 80.7 84.9

 

Now you may see the component temperatures are under the limitation. Screwing the CFM500M/S on the aluminum plate would let the output power reach to 410W under the higher temperature of 70℃ due to the benefit from the baseplate-cooling design. In addition, for the experiment of the CFM500M/S with 12Vdc output and the highest output current in this series, it could still have the output power of 300W under the stricter condition of 115Vac input and 70℃.

 

2. CFM500M/S-C is screwed on an aluminum plate with size of 480 x 248 x 1.2mm to simulate the test which is run on user’s device.

 

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Input V: 115 Vac, Output V: 12Vdc, and Ambient Temperature 40 to 70℃ (Natural Convection)

Part Number CFM500M/S-C
Rated Power 420W 390W 350W 310W
Ambient 40℃ 50℃ 60℃ 70℃
Input EMI FILTER 95.9 99 99.2 107
PFC Inductance 91.2 95.4 97.7 102
PFC MOS 102.2 106.2 108.4 112.9
PFC FILTER CAP. 106 107 107.5 107
PFC DIODE 107.5 111.2 113.4 117.7
LLC MOS 109 112.3 113.4 117.4
LLC DRIVER 101 104.4 106.3 110.5
BRIDGE DIODE 102.3 105.6 107.5 112.1
Transformer 114.2 116.5 116.7 118.9
Output SR DRIVER 124 124 121.8 124
Output SR MOS 118 116.6 114.9 117.6
Output Pi FILTER 104.5 105.7 105.1 107.1
Output Cap.1 102 104 102.9 95.9
Output Cap.2 97.3 103.5 102.7 104
Output Cap.3 88.6 92.1 92.7 94.6

 

Input V: 230 Vac, Output V: 48Vdc, and Ambient Temperature 40 to 70℃ (Natural Convection)

Part Number CFM500M/S-C
Rated Power 500W 500W 500W 430W
Ambient 40℃ 50℃ 60℃ 70℃
Input EMI FILTER 79.6 88.8 92.9 97.6
PFC Inductance 83.5 92.9 97.5 101.1
PFC MOS 91.8 101.4 107.8 112.9
PFC FILTER CAP. 85.4 94.9 98.2 98.7
PFC DIODE 70.5 79.6 87.5 92.6
LLC MOS 104.4 115.3 116.8 118.6
LLC DRIVER 92.6 103 107.2 110.6
BRIDGE DIODE 83.8 93.3 99.6 104.1
Transformer 108.1 117.9 117.4 117
Output SR DRIVER 97.4 107.5 109.1 110.5
Output SR MOS 84.6 94.9 99.2 102.6
Output Pi FILTER 80.9 90.5 94.8 97.5
Output Cap.1 82.9 92.3 96.6 97.6
Output Cap.2 84.6 94.5 97.9 99.5
Output Cap.3 70.6 80.1 85.8 88.8

 

Now you may see the component temperatures are under the limitation. Screwing the CFM500M/S-C on the aluminum plate would let the output power reach to 430W under the higher temperature of 70℃ due to the help of the baseplate-cooling design and the cover. In addition, for the experiment of the CFM500M/S-C with 12Vdc output and the highest output current in this series, it could still have the output power of 310W under the harsher condition of 115Vac input and 70℃.

 

Installation Instruction:

The CFM500M/S have the mechanical design to be fixed on a metal plate or on the surface of the user system case which could have a faster and more efficient conduction for heat dissipation. There are three ways to screw the power supply, increasing the flexible choices of installation.

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Mechanical Specification:

 

Baseplate Cover
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Conclusion:

The CFM500M/S series provide 500W output power with the compact size of 3” x 5”. The baseplate cooling design makes this series achieve the higher power density and improves the heat dissipation performance under fanless condition and higher ambient temperature. Furthermore, the CFM500M/S offer an additional 12Vdc fan output pin with the protection to keep the main output operating stably while the connected fan runs into the situation of malfunction and short circuit.

 

Forced Air Flow Curve below shows the CFM500M/S could work at 500W with a 21CFM fan. Whether or not to use a fan still depends on the system environment. Some users evaluate the situation that it is accepted for them to use CFM500M/S under fanless condition. Nevertheless, the CFM500M/S series show the flexibility, stability, and reliability in different system environments with various setup options, such as baseplate type, cover type, or either one connected with a fan.

 

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Product Page:CFM500M  & CFM500S

Contact for more support: sales@cincon.com.tw

 

 

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