Design introduction and efficiency evaluation of DC-DC Converter
Power management is a challenging element in many areas of electronic design, not just in the industry. By managing efficiency and thermal management issues in the best way, it is possible to obtain equipment with very low energy consumption. To achieve an effective DC-DC Converter, there are several features to consider. Each approach has specific advantages and disadvantages, depending on a set of operating conditions.
Design Introduction to DC-DC Converter
The design of the DC-DC Converter follows a number of specifications that must be approved according to the application domain. Examples of these specifications are input voltage range, output voltage value, output power, efficiency, electrical insulation between input and output, and industry standards. In the design of DC-DC Converter, many factors determine the correct value of the relevant components. In addition, the selection of the best switching technology which is the basis for the operation of the DC-DC Converter must be considered to further optimize the efficiency of the converter. The technology (IC) used, materials, dimensions and compliance are a major part of the final cost. The design of the power stage needs to identify characteristics such as transient tolerance and load characteristics (impedance range). Transient response is a good indicator of the level of power supply performance. It is a measure of the degree to which the direct current can withstand changes in the load impedance.
Efficiency evaluation of DC-DC Converter
System losses play an important role in evaluating the efficiency of DC-DC converter.
They analyzed two types: switching losses caused by the peak current in the inductor and by the charge-discharge phase of the converter's circuit. With regard to the loss of peak current in the inductor, two elements can be identified, one related to the drain-source resistance of the on-off switching FET during turn-on, and the other related to the DC resistance of the inductor. Switching loss or dynamic loss is mainly caused by the capacitive effect of the circuit. In particular, the drain-source parasitic switching capacity of the FET and the diode must be considered. The energy loss of the inductor core is proportional to the switching frequency. In fact, the increase of frequency is accompanied by the increase of core loss of the inductor. This type of leak is due to the size of the material and core. The optimal selection of the inductor mainly includes three aspects: saturation current must be greater than the maximum current flowing in the inductor; The continuous resistance of the inductor; And the physical size of the sensor. The FET must be able to withstand the drain-source voltage when the inductor discharges. In addition, the maximum drain current must be higher than the peak current through the inductor. In order to minimize switching losses, a field-effect transistor must have a low gate - and drains - source capacitance values.
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Grasen DC-DC converter
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