How to Choose a DC Power Supply for Your Application?
Five Key Selection Steps
DC power supply is one of the essential instrument for electronic engineers, and this article explains how to select a DC power supply from the application perspective.
Five key steps in selecting a DC power supply:
Step 1: The selection of DC power supply categories:
DC power supplies have different features based on the design method. The seven most common features are utilized (inclusive size, weight, ripple and noise, response time, efficiency, common mode noise current and cost) to compare the following three design categories. The reason for using features is that when applied appropriately, they serve as advantages, but if applied inappropriately, they can be disadvantages. For example, if your DUT is a battery-powered product, choosing a linear DC power supply with low ripple and noise characteristics would be the optimal choice.
|Ripple and noise
|Common mode noise current
Low cost for power below 500WHigh cost for power above 500W
|Low cost for high wattage
Table 1: Features of Various Categories of DC Power Supplies
Step 2: Is there a remote control requirement?
Remote control methods
Required connection interfaces for computer control: USB/LAN/RS-232/RS-485/GPIB. Considerations for the interface include:
Industrial control interfaces: ModBus/ProfiBus/ProfitNet/DeviceNet/CAN
Step 3: How many output channels?
DC power supplies can have either single or multiple outputs.
Step 4: In what output ranges?
The design of the output range of DC power supplies is divided into three types: single range, dual range, and wide range.
In a DC power supply, the most challenging situation is when it encounters limitations in voltage or current that fall short of the requirements. In such cases, a dual-range or wide-range design becomes crucial to maximize the applicability of the power supply.
Figure 1 Left: Voltage and current output range illustration for single output range.
Figure 1 Right: Voltage and current output range illustration for dual output range (GW Instek PSM, PPH, and SPD series power supplies with dual output range capability).
Figure 2: Voltage and current output range illustration for multi output range (GW Instek PSR, PSB, PSW, and PFR series power supplies with multi-range output capability).
Step 5: Special function requirements?
In response to customer application needs, the design of DC power supplies has evolved over time, giving rise to various special features. These features include:
The above special features will be elaborately explained in individual application articles. The filtering functionality on the GW Instek official website (Figure 3) allows users to easily find the DC power supply that suits their applications by simple clicks.
Figure 3: Filtering Functionality on the GW Instek Official Website.(Click)
Overseas Sales Department
Good Will Instrument Co., Ltd
No. 7-1, Jhongsing Road, Tucheng Dist.,
New Taipei City 23678, Taiwan R.O.C