![]() ![]() If current of only a few mA is needed, the low efficiency might not be a problem at all. Can this rather low efficiency be tolerated in a system or not? This depends on the current required from this 3.3 V rail. If, for example, a conversion efficiency of 90% is assumed for each conversion stage, the energy for 3.3 V, which has already passed through two conversion stages, only has an efficiency of 81% (0.9 × 0.9 = 0.81). Each conversion stage has only limited efficiency. If intermediate voltages, such as 5 V in the example shown in Figure 1, are used to generate additional voltages, the energy used for the 3.3 V must already pass through two conversion stages. Since an important property of a power supply is the conversion efficiency, keeping the efficiency as high as possible is important when selecting the architecture. However, how do you generate the other voltages? Does it make sense to generate the 3.3 V from the 5 V already created, or should we convert to 3.3 V directly from 24 V? Answering these questions requires further analysis. What is the best method for generating the individual voltages? Selecting a classic step-down switching (buck) converter makes the most sense for converting from 24 V to 5 V. ![]() This voltage must be converted now into 5 V, 3.3 V, 1.8 V, 1.2 V, and 0.9 V with corresponding currents. The 24 V supply voltage of an industrial application is shown on the left. Figure 1 shows a typical block diagram of a power supply. At this point, the decision is made as to whether and how many intermediate circuit voltages need to be created. This step becomes more complex by increasing the number of needed voltage rails. Power Supply Design Step 1: Creating the Power Supply ArchitectureĬreating a suitable power supply architecture is a decisive step in power supply design. These tools can be valuable to both the novice and expert power supply design engineer. ![]() This article details the use of semi-automated design tools through five critical steps of the power supply design process. While total automation of power supply design is yet to be achieved, a comprehensive range of semi-automated tools are available today. Improving Power Supply Design Using Semi-Automation-Five Steps to Quick and Efficient Designįrederik Dostal Download PDF Introductionĭesigning the correct power source is essential and complex, since there is no one typical application. ![]()
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