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Power Module Selection Guide

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.05.29
Determine the specifications of the power supply, screen based on actual demand indicators, and determine whether to use standard power modules or non-standard power supplies. Non standard power supplies can be customized for production according to demand.


AC DC POWER MODULE

Step 1:The first step is to choose the input voltage type, AC or DC input

● AC input selection AC-DC module (AM21 single output series, AM22 dual output series)

● DC input selection DC-DC module (DM21, DM24, DM31, DM41 single channel series)

Step 2: Choose the input voltage type, AC or DC input

Firstly, confirm the minimum and maximum values of the input voltage, and then select modules in different ranges based on the determined input voltage;

The voltage changes in the output of variable voltage rectification and various types of batteries, batteries, lithium batteries, dry batteries, long-distance transmission, etc. will be relatively large. Sufficient margin should be reserved in the design to ensure the stability and reliability of the entire system!

● Common DC voltages: 5V (4.5-9V), 12V (9-18V), 24V (18-36V), 48V (36-75V)

● The range of input voltage variation is 2:1;

● AC common voltage: 110V/220V/50-60Hz.

Step 3: Choose the input voltage type, AC or DC input

The common specifications for output voltage are:

● Single output: 3.3V, 5V, 9V, 12V, 15V, 24V, 48V;

● Dual output: 3.3+1.2V, 3.3+5V, 12+5V, 24+5V, 24+12V;

● Negative pressure output: -5V, -9V, -12V, -15V;

● Positive and negative voltage output: ± 5V, ± 9, ± 12V, ± 15V, etc

Step 4: Choose the input voltage type, AC or DC input

After the load is selected, the output current is basically determined, and the magnitude of the load current is the key to determining power, which also directly affects the reliability and price of the module. The power module is best applied under 30% -80% power conditions, provided that it is used at room temperature. If it is in a high or low temperature environment, specific derating design needs to be considered. Choosing the appropriate output current is one of the key factors for successful design, as excessive or insufficient current can lead to lower reliability and higher costs.

Under high temperature conditions, the power module should be derated for use, and a power derating of 30% -40% or more can be selected. For high-temperature applications or conditions with poor heat dissipation, priority should be given to modules with larger volumes under the same power conditions; For situations where long-term work is above 70 ℃, please consult our technical service personnel to select a power module suitable for working in high-temperature environments.

Step 5: Choose the input voltage type, AC or DC input

Isolation feature, so that the input and output of the module are completely two independent (not grounded) power sources.

In industrial bus systems, safety isolation is required when facing harsh environments such as high peaks, lightning strikes, and arc interference, which can also eliminate grounding loops; In hybrid circuits, achieve noise isolation between sensitive analog circuits and digital circuits; Realize voltage conversion in a multi voltage power supply system.

Step 6: Select the packaging size of the power module

The power module needs to reserve sufficient space to consider the impact of its heat dissipation radiation on signal acquisition interference, as well as the impact of module electromagnetic interference on the performance of other circuit components. Therefore, it is necessary to consider both volume and cost, while also comprehensively considering the reliability of the module. In short, using standard module specifications as much as possible can achieve the goals of low cost, mature technology, low development resistance, and saving development time.

For other special requirements such as high isolation, ultra wide voltage range input, high temperature environment, EMC, UL certification, etc., it is best to consult technical service personnel.
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