Transcription of Topologies for switch mode power supplies
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Topologies for switch mode power supplies
APPLICATION NOTETOPOLOGIES FOR SWITCHED MODEPOWER SUPPLIESby L. Wuidartthe rectifier, different types of voltageconverters can be made:- Step down Buck regulator- Step up Boost regulator - Step up / Step down Buck - Boost regulatorII - 1 The Buck converter: Step downvoltage regulatorThe circuit diagram, often referred to as a chopper circuit, and its principal waveformsare represented in figure 1:This paper presents an overview of the mostimportant DC-DC converter Topologies . Themain object is to guide the designer in selectingthe topology with its associated powersemiconductor INTRODUCTIONThe DC-DC converter Topologies can bedivided in two major parts, depending onwhether or not they have galvanic isolationbetween the input supply and the NON - ISOLATED SWITCHINGREGULATORSA ccording to the position of the switch andAN513/03931/18 Figure 1: The step down Buck regulatorThe power device is switched at afrequency f = 1/T with a conduction dutycycle, = ton/T.
The forward converter transfers directly the energy from the input source to the load during the on-time of the power switch. During off-time of the power switch, the energy is freewheeling through the output inductor and the rectifier D 2, like in a chopper (see figure 1). 2P out ηV inmin (1 + A + A2) 3δ max I Drms ≥ * Power switch: η δ ...
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