The gain-frequency curve of an LLC resonant converter is a graphical guide displaying both the gain and operating frequency. At resonance frequency, the gain is certain to be unity. However, at above or below the resonance, the gain is no longer unity. In this article we will cover how LLC converter gain-frequency curve works or how to interpret it and
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You may be wondering why LLC resonant converter gain is unity. How it happens and how to mathematically derive it. If you have these questions, then you are on the right page. I will be sharing to you the answers to these questions. In the previous topic, I discussed the equivalent AC circuit of an LLC resonant converter. Read How
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Buck converter can be synchronous or non-synchronous type. The former uses a MOSFET (or BJT, IGBT) in place of the buck diode. Basically, there are two switches in synchronous type. On the other hand, the latter uses a switch and a diode combination. This is simpler and cheaper than the former since there is only a single MOSFET to control.
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Designing DCDC converter may not any more difficult by the help of online tutorials, simulation software and applications notes. However, the task will not end on the design. Checking if the design is working great is another challenge. Here is the step by step guide on how to test and troubleshoot DCDC converter. How to Test and Troubleshoot DCDC Converter
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Diode is very important integral part of a buck converter. It is very popular than using a switch in the same location. A diode does not need a control mechanism while a switch needs. A diode is cheaper than a switch considering there is an added control mechanism. Here are the guides on how to select a buck converter diode.
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Before going to the discussion on how to select a transformer, let us cover first some of the transformer basic fundamentals. Transformer is could be a low frequency like those used in 50Hz or 60Hz line. Transformer is could be a high frequency one like those used in switching mode power supplies. Transformer will transfer power from the primary to
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IGBT has two types of losses. One is conduction and the other one is switching. Conduction loss is due to the voltage drop between collector and emitter times the collector current. On the other hand, switching losses is due to the dynamic parameters of the IGBT. If you are looking for an explanation on how to derive IGBT power losses,
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If you are asking how to derive LLC converter AC circuit, this article is perfect for you. The derivation is based on the first harmonic approximation (FHA). FHA is popular method in deriving AC circuit like those of an LLC which only considering the fundamental signal of a square wave. In this article I will give you some insights in
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These are the important things to consider on how to select a MOSFET for power electronics. These parameters when considered during the development stage, you can ensure a product with a very high reliability. 17 Key Items to Consider on How to Select a MOSFET for Power Electronics 1. Gate to Source Threshold Voltage (VGSth) Let us start this tutorial
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1. Select Inductance Value a. Define the switching frequency for the boost converter Example: Fsw = 300kHz b. Define the input and output voltage Example: Vin = 12V, Vout = 24V c. Determine the duty cycle Dutycycle = 1 – (Vin / Vout) Example: Dutycycle = 1 – (Vin / Vout) = 1 – (12V / 24V) = 50% d.
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